WO2006115149A1 - Packaging member for electron beam heating making use of planar fastener - Google Patents

Abstract

A packaging member for electron beam heating constituted of a thermoplastic resin, characterized in that at an opening region of the packaging member, two hook planar fasteners having hooklike engaging elements are provided in mutually engaging relationship, and that portion of mutual engagement of the two hook planar fasteners exhibits a steam permeability of 0.5 to 200 cc/m ⋅ min with respect to 100°C steam and exhibits a disengagement pressure resistance of 0.5 to 5.0 kg/cm in the presence of the heated steam. The packaging member is so structured that the opening region and a steam release port are provided in the same place, thereby attaining not only simplification of structure and reduction of production cost but also providing of a packaging member for electron beam heating that is easy to use and facilitates re-opening and re-heating of the packaging member.

Description

 Specification

 Packaging material for electron beam heating using hook-and-loop fastener

 Technical field

 TECHNICAL FIELD [0001] The present invention relates to an electron beam heating packaging member using a hook-and-loop fastener, and more specifically, heats a water-containing food or fiber article by irradiating an electron beam, that is, a high-frequency electromagnetic wave, or a water-containing fiber. The present invention relates to an electron beam calorie packaging member used for sterilizing stored articles with water vapor generated from the articles.

 Background art

 [0002] Frozen foods and refrigerated foods (hereinafter sometimes referred to as frozen foods) are frequently used as household foods and commercial foods. These frozen foods are heated for cooking in a pan or the like immediately before consumption, or heated by a high-frequency electromagnetic wave in an electron beam irradiation apparatus typified by a microwave oven and used for food. Microwave ovens are easy to use and easy to use, and they are also energy efficient.

 In addition, small hot towels such as hand towels, which are hand towels, and hot / dry towels used for patients in hospitals and nursing homes are often used. In hospitals, many types of instruments are used after heat sterilization. In these fields, sterilizers are placed in water boiling devices called sterilizers and high-temperature steam generators typified by autoclaves, and sterilized by bringing them into contact with high-temperature water or steam.

 [0003] Various electron beam heating packaging members for frozen foods described above have been conventionally proposed. For example, an opening is provided in a plastic lid body, and the opening is a water vapor permeable nonwoven fabric or paper. A container that is covered with a perforated film and allows water vapor generated by heating to pass through the nonwoven fabric has been proposed! Speak. (See Patent Document 1)

 In addition, a bag-shaped packaging member has been proposed in which a bent exhaust passage is provided to adjust the internal pressure that rises when heated, that is, the water vapor pressure, to a certain range, and a zipper-type fastener is provided separately. (See Patent Document 2)

[0004] However, the packaging member described above is provided with a water vapor exhaust port and an opening of the packaging member separately. As a result, the structure is complicated and the manufacturing cost is high, and it has not been widely spread. In addition, there is no provision for a hand towel or instrument heat sterilization method that can be easily performed in a small-scale facility or home, and it is desired to meet the increasing demand in this field.

 Patent Document 1: Japanese Patent Application Laid-Open No. 11 11544

 Patent Document 2: JP 2000-344279 A

 Disclosure of the invention

 [0006] The present invention solves this problem, and an object of the present invention is to simplify the structure and reduce the manufacturing cost by providing a structure in which the opening of the packaging member and the water vapor exhaust port are provided at the same location. An object of the present invention is to provide an electron beam heating packaging member that can be easily used and re-sealed and reheated immediately after use.

 As a result of intensive studies to solve the above problems, the present inventors have obtained a packaging member for heating an electron beam having good performance by engaging a specific surface fastener and using it as a sealing member. The present invention has been reached.

 That is, the present invention is an electron beam heating packaging member made of thermoplastic resin, and two hook surface fasteners having hook-like engagement elements are engaged with each other in the opening of the packaging member. The engagement portion formed by the two hook surface fasteners has a water vapor permeability of 0.5 to 200 cc Zm'min with respect to water vapor at 100 ° C, and is 0 in the presence of the heat water vapor. 5-5. A packaging member for heating an electron beam, characterized by having an engagement / separation pressure resistance of OkgZcm.

 [0007] According to the present invention, it is possible to provide an electron beam heating packaging member capable of easily and safely performing electron beam calorie heat in a state where a water-containing article such as food is contained. Further, in the present invention, by using a specific molded hook surface fastener as a constituent member, it can be firmly melt-bonded to polyethylene or polypropylene as a base material of the packaging member, and an electron beam heating packaging member can be easily obtained. Can be manufactured.

 Brief Description of Drawings

FIG. 1 is a schematic plan view showing an example of an electron beam heating packaging member of the present invention.

 [Fig. 2] Schematic cross-sectional view of the packaging material of Fig. 1 along X-X line

 FIG. 3 is a perspective schematic view showing another example of the electron beam heating packaging member of the present invention.

FIG. 4 is a schematic plan view showing another example of the electron beam heating packaging member of the present invention. [FIG. 5] Schematic cross-sectional view of the packaging member in FIG.

 [Fig.6] Schematic diagram of the enlarged cross section of the high temperature seal

 Explanation of symbols

[0009] 1: Continuous tubular molded body

 2: Upper end

 3: Lower end

 4: Engagement part by hook surface fastener

 5, 6: hook hook and loop fastener

 7: Notch for opening

 8: Bottom

 9: High temperature opening seal

 10: Thermosoftening resin

 11: Thermosoftening resin

 12: Rail-like continuous ridge

 13: Thermosoftening oil

 BEST MODE FOR CARRYING OUT THE INVENTION

[0010] The packaging member for heating an electron beam of the present invention can be used without limitation as long as it has a shape that can accommodate and seal an article, and can be in a bag shape, a box shape, a cylindrical shape, or the like. The packaging material is made of a material that can withstand -30 ° C freezing temperature and about 100 ° C water vapor, such as thermoplastic resin such as polyethylene, polypropylene, polyamide, polyester, fiber, paper, etc. A composite with can also be used. From the viewpoint of fusibility, materials containing polyethylene or polypropylene are particularly preferred.

 The packaging member of the present invention is formed by processing the raw material into a packaging member of an arbitrary shape by a known technique and engaging two hook hook-and-loop fasteners having hook-like engagement elements with each other in the opening. Packaging member.

[0011] The hook surface fastener used in the present invention includes both a molded hook surface fastener manufactured by a known extrusion molding method and a molded hook surface fastener manufactured by an injection molding method. It is desirable that the resin constituting the hook surface fastener of the present invention not only has excellent melt adhesion to the base material, but also has excellent formability in order to satisfactorily produce a hook surface fastener that is a fine molded body. . Further, the hook-shaped engaging element standing on the substrate of the hook hook-and-loop fastener can adopt various shapes such as substantially mushroom-shaped, arrow-shaped or forceps-shaped, and particularly preferably a substantially mushroom-shaped engaging element. .

 In the electron beam heating packaging member of the present invention, it is preferable that the surface fastener that is fused to the polyethylene or polypropylene-made case is manufactured from the same material. On the other hand, it is necessary to manage the material of the hook and loop fastener in accordance with the grease material of the packaging member, so the surface fastener that fuses well to any grease is a practical advantage. Is big.

 The melt adhesion to polyethylene and polypropylene is expected to show good performance in the composition containing both rosins, but the present inventors have changed the thermal shrinkage rate of the molded surface fastener depending on the amount of components in the composition. It has been found that the shape and performance of the molded surface fastener after melt bonding are greatly affected.

 [0012] Accordingly, as a result of examining a composition that provides a surface fastener having excellent fusion property to polyethylene and polypropylene as a base material of a packaging member and having a low heat shrinkage rate as a molded surface fastener, polyethylene (hereinafter referred to as PE) It has been found that the above-mentioned problems can be solved by using a composition containing 10 to 70 wt% of polypropylene (hereinafter sometimes referred to as PP) and 90 to 30 wt% of polypropylene (hereinafter also referred to as PP). More preferably, the composition contains 20 to 50% by weight of PE and 80 to 50% by weight of PP.

 Composition Forces with Compositions Other Than the above The obtained molded surface fastener may be fused well only to one of the PE or PP base materials. In addition, a molded surface fastener made of a composition having a PE content of more than 70% by weight has a large shrinkage of the surface fastener when fused to a base material having a heat shrinkage rate of 10% or more. In addition to “scratching” between the hook-and-loop fasteners, the hook-and-loop fastener itself may be deformed and the target engagement force may be reduced.

[0013] When a hook surface fastener is produced by melt molding the composition having the above composition, PE has a melt index of 3 to 20, while PP has a melt index of 0.7 to 3. Is preferably used. A polymer with a high melt index has a low melt viscosity. A polymer with a low index is high in melt viscosity. In the present invention, a hook surface fastener excellent in moldability can be obtained by a composition obtained by melt-mixing PE having a low melt viscosity and PP having a high melt viscosity. In a hook-and-loop fastener that is inferior in formability, the fine hook-shaped engaging elements are not formed in a desired shape, and the engaging elements to be erected fall down or the shape of the forceps-shaped or substantially mushroom-shaped head deforms. When the engaging element is deformed in this way, the engaging force, which is the most important performance of the hook surface fastener, is greatly reduced.

[0014] The PE used in the present invention can be used without particular limitation as long as it is within the above-mentioned melt index, and examples thereof include high-density PE, low-density PE, and so-called meta-mouth cene PE that is polymerized by a meta-mouth catalyst. Can be used. PP can also be used without particular limitation as long as it is within the above melt index range. On the other hand, the PE and PP used for the base material may be selected according to the intended use.

 In the present invention, the melt index is measured by a method based on JIS K6921.

 [0015] The molded hook hook-and-loop fastener used in the present invention is a mixture of the above-mentioned PE and PP chips, supplied to the ether ruder, and heated to 200 ° C to 250 ° C and transferred to the discharge port to be homogeneous. A mixed molten resin composition is obtained. A molded hook hook-and-loop fastener can be produced by the above-described method by injecting the composition into a tape or a fine pore roll extruded from a discharge roller.

 [0016] The molded hook hook-and-loop fastener used in the present invention is used by being melt-bonded to the base material of a packaging member made of PE or PP, and therefore it is more preferable to have a bending resistance of 50 to 125 g. It is 75-120g. Molded surface fasteners with a bending resistance of less than 50 g are highly flexible. The hooks are easily deformed and may easily come off when the molded hook surface fasteners are engaged with each other. In addition, a molded hook hook-and-loop fastener having a bending resistance exceeding 125 g has high rigidity, and thus has low affinity with a flexible substrate such as a film, which may make fusion bonding difficult.

 [0017] In the present invention, the bending resistance is measured using a handle O meter, which is a texture measuring machine, according to JIS.

Measure according to L1018 (Method E) or «JIS L1096 (Method E). The molded hook hook and loop fastener to be measured has a width of 25 mm and a length of 150 mm, and the plate width for carrying the load is 30 mm. Measure as

 [0018] The molded hook hook-and-loop fastener and the base material of the packaging member used in the present invention are melt-bonded by a high-frequency electromagnetic wave or an ultrasonic welder. For example, a PE substrate can be melt bonded at a temperature around 140 ° C, while a PP substrate can be melt bonded at a temperature near 180 ° C. As described above, according to the present invention, it is possible to obtain a molded hook hook-and-loop fastener that exhibits good melt-adhesiveness even when the melt-adhesion temperatures differ by nearly 40 ° C. and that does not have a decrease in engagement force with little heat shrinkage. it can.

 [0019] The molded hook hook-and-loop fastener is not limited to the packaging member intended by the present invention, and can be widely used. The size and density of the engaging elements and the width of the hook-and-loop fastener can be arbitrarily selected depending on the use of the molded hook hook-and-loop fastener. For example, when used as a sealing material for a decorative material, the height of the hook-like engagement element is preferably 0.3 to LOmm, and the element density is preferably 10 to 300 Zcm2. The width of the molded surface fastener is preferably 10 to 50 mm.

On the other hand, when attached to the opening of a bag made of a resin film like the packaging member of the present invention, the height of the engaging element is 0.5 to 6. Omm, and the hook-like engaging element density is 15 to 250. The book Zcm ² is preferred. The formed hook hook-and-loop fastener preferably has a width of 2 to 15 mm. If a structure for engaging the molded hook hook-and-loop fasteners of the present invention is provided at the opening of the bag, it is possible to provide an opening and a vapor permeability that cannot be obtained by the opening of the conventional rail-shaped zipper.

[0020] The hook-and-loop fastener used in the present invention presses and engages hook hook-and-loop fasteners, peels and releases the hook-and-loop fasteners, and performs sealing and opening. Usually, a hook-and-loop fastener is a force used in combination of a hook-and-loop hook fastener and a loop hook-and-loop fastener having a loop-like engagement element. In the present invention, the engagement strength, water vapor permeability, and accommodation when repeatedly engaged. A combination of hook hook-and-loop fasteners is used because the effect of contamination on the hook-and-loop fasteners is low. The size of the hook-like engagement element and its density are selected to obtain the required performance. Engagement between hook surface fasteners has sufficient peel strength but does not necessarily seal completely. However, the purpose of using the conventional hook hook-and-loop fastener is to make the above performance as perfect as possible, and the purpose of actively using incomplete sealing is rare. In the present invention, a water-containing article is accommodated in a packaging member provided with a hook surface fastener, and the packaging member is heated by an electron beam so that the water-containing article is heated. When heating up to a large amount, excessive water vapor is released while maintaining the engagement of the hook hook-and-loop fastener, and sufficient heating is carried out while avoiding rupture of the packaging material. With the goal.

 [0021] From this point, the engagement portion where hook hook-and-loop fasteners used in the present invention are engaged with each other has a water vapor permeability with respect to heated steam at 100 ° C (water vapor permeability of an opening using a hook-and-loop fastener). It is necessary to have an engagement / separation pressure of 0.5 to 5 OkgZcm in the presence of the same heating steam.

 If the water vapor permeability (hereinafter sometimes referred to as VP; Vapor Permeability) is less than 0.5 cc / m-min, the water vapor is not released sufficiently and the possibility of the packaging member being deformed or ruptured increases. On the other hand, when VP exceeds 200ccZm'min, it is not possible to hold water vapor that requires a lot of water vapor.

 More preferably, the range of the water vapor permeability of the engaging portion by the hook surface fastener used in the present invention is 1.0 to LOOccZm'min. The VP is provided with a water vapor inlet in the packaging member, supplies water vapor at 100 ° C, and adsorbs the water vapor discharged from the hook-and-loop fastener engaging portion provided in the opening of the packaging member to a moisture absorbent such as silica gel. It is measured by determining the amount of weight increase.

 [0022] The hook hook-and-loop fastener used in the present invention described above is further referred to as an engagement separation pressure (hereinafter referred to as PER; Pressure of Engagement Release) of 0.5 to 5. OkgZcm in the presence of heated steam at 100 ° C. It may be necessary to have).

That is, if the PER of the engaging portion where hook hook-and-loop fasteners heated with water vapor at 100 ° C are engaged is less than 0.5 kgZcm, the hook-and-loop fastener is disengaged during heating, and the packaging member opens. There is a fear. On the other hand, when the PER exceeds 5. OkgZcm, it is difficult to release the engagement of hook surface fasteners because the hook surface fastener has a high engagement force. A more preferable range of PER of the hook surface fastener is 1.0 to 4. OkgZcm. In the present invention, PER is measured according to a method for measuring the tensile strength (latch strength) of a hook surface fastener in a water vapor atmosphere at 100 ° C. Specifically, two hook-and-loop fasteners (sample size: 25mm x 25mm) with double-sided adhesive tape attached on the back are overlapped on the engagement surface, and a 2kg iron roller is reciprocated once on the surface, and crimped. Next, both Remove the release paper of the surface adhesive tape and attach it to the tensile test measurement jig, peel off the hook-and-loop fastener engagement at a speed of 300mmZ, and read the maximum peel force. In the present invention, it is not necessary to strictly use water vapor at 100 ° C, and boiling water vapor under conditions of normal pressure, that is, approximately 1 atm, is used as water vapor at 100 ° C.

[0023] As described above, the hook hook-and-loop fastener used in the present invention can be arbitrarily designed and selected according to its use, but the height of the hook-like engagement element is 0.3 to about LOmm and the hook density is 10 About 300 Zcm ² The required VP can be obtained by adjusting the density of the engaging elements of the hook hook-and-loop fastener. In other words, if the density of the hook-like engagement elements is made sparse, the gap between the elements becomes large and water vapor is easily released, and if the density is made large, the gap between the elements becomes small and the release of water vapor is small. Become.

 The VP engages two hook surface fasteners (the first hook surface fastener and the second hook surface fastener) with the same or different heights of the hook-like engagement elements, and provides a gap between the surface fasteners. It can be adjusted by discharging water vapor from the gap. The height difference between the engaging element of the first hook surface fastener and the engaging element of the second hook surface fastener is preferably adjusted to be 0 to 5. Omm. Even with a differential force of Omm, there is a small gap microscopically, and in fact there is considerable water vapor release. A more preferable height difference is 0 to 3.0 mm. The structure with a large difference is also suitable for the purpose of discharging the liquid in the packaging member after water vapor is released.

 Hereinafter, the packaging member of the present invention will be described in more detail with reference to the drawings.

 FIG. 1 is a schematic plan view showing an example of the electron beam heating packaging member of the present invention, and FIG. 2 is a schematic cross-sectional view of the packaging member of FIG. The packaging member shown in Fig. 1 is a continuous tube-shaped molded body 1 made of a resin film that serves as a base material 1. The upper and lower ends 2 and 3 are sealed, and two hook hook-and-loop fasteners are engaged inside the upper end 2. The engaging part 4 is provided. The engaging portion 4 is provided by arranging the hook surface fasteners 5 and 6 to engage with the inner surface of the bag as shown in FIG.

For example, a bun with a bean-jam filling is contained in the packaging member described above and sealed. In order to use the packaging member, the upper end 2 is sealed with, for example, an opening notch 7 provided below, so that the engagement portion by the hook surface fastener and the outside air are separated. Make contact. In this state, the packaging member is heated in a microwave oven (hereinafter sometimes abbreviated as a range). Water vapor is generated as food is heated, and when the water vapor pressure becomes high, the water vapor is released from the engagement portion (sealing portion) by the hook surface fastener. By appropriately releasing water vapor, the packaging member can be prevented from rupture and desired high-temperature heating can be performed safely. If the release of water vapor from the engaging portion by the hook surface fastener is too small, the packaging member may burst due to an increase in the internal pressure, or the food may be overheated and the flavor may be impaired. In addition, if the water vapor is excessively discharged, heating at the desired temperature cannot be performed, and moisture is excessively evaporated from the food and the flavor is impaired.

 FIG. 3 is a perspective schematic view showing another example of the electron beam heating packaging member of the present invention. The packaging member in FIG. 3 has substantially the same structure as the packaging member shown in FIG. 1, except that it has a bottom 8 with a large area. Since the packaging member shown in FIG. 3 can accommodate a large amount of articles and is stable, the packaging member can be provided as it is to a table after heating, which is convenient for the user. is there.

 [0026] The efficiency of living is increasing in the number of households, and the use of processed foods and cooked foods is increasing. Microwave ovens are frequently used for heating, but there are still packaging materials that are convenient for heating. Not provided. The packaging member of the present invention solves the problems of the conventional range heating packaging member, and can provide the user with safety and many conveniences.

 [0027] The packaging member of the present invention can also be used for packaging of articles other than food that require heating. For example, hot and cold hand towels used in the service sector such as homes and restaurants have been heated after cooking with hot water or by placing wet towels on a dish-like container. When using a lot of hand towels, the above method is inefficient. If a wet towel is previously stored in the packaging member of the present invention and cooked in the range according to the above procedure, a desired amount of warm towel is easily obtained.

[0028] On the other hand, in hospitals, nursing homes, and the like, body cleaning is performed on patients and the like, and a large amount of hot and cold towels are used at this time. The packaging member of the present invention can also be used for preparing the hot and cold towel. If towels that have been washed and moistened in advance are stored in the packaging material of the present invention, stored in a refrigerator, etc., and heated to a hot and humid towel when necessary, the work efficiency will be improved and the hygienic environment will be improved. Can be planned. In addition, there are appliances that are sterilized in hospitals, nursing homes, home care, etc. (heat sterilization articles such as glass, ceramic, and plastic medical instruments such as medical plastic gloves). The packaging member of the present invention can also be used for sterilization of the instrument. A sterilizing instrument and a hydrous material (for example, a hydrous fiber product such as a hydrous nonwoven fabric) are accommodated in the packaging member of the present invention.

If the instrument is heated in a range and the instrument is sufficiently brought into contact with water vapor at 100 ° C, the instrument can be sterilized. If sterilization is followed by cooling in the packaging material, contamination of the equipment up to use can be prevented and the sanitary environment can be improved. Strict sterilization is regulated by the laws and regulations of each country such as the Japanese Pharmacopoeia. Therefore, it is desirable to adjust the engagement of the hook hook-and-loop fastener so as to conform to the regulations. The packaging member of the present invention is not limited to the above-described uses, and can be widely applied to articles using high-temperature steam generation and a high-temperature steam atmosphere.

 [0029] The present inventors have further examined the packaging member for food, and particularly when a food containing liquid such as sauce or soup is contained in the packaging member, the liquid flows in the packaging member, The hook hook-and-loop fastener flows into the hook hook-and-loop fastener and fills the gap between the hook-like engagement elements, and the water vapor transmission function in the range heating may be lost. It was found that it might be difficult to engage. Such a problem is important to be improved in an electron beam heating packaging member containing food. To solve this problem, a specific high-temperature opening seal was provided on the packaging material. Specifically, a high-temperature opening seal part toward the outer edge of the opening part of the packaging member, a hook-and-loop fastener engaging part in which two hook hook-and-loop fasteners having hook-like engaging elements are engaged with each other, and an opening It has been found that by providing an opening sealing part sealed at the edge of the part in sequence, good range heating can be performed even when food containing liquid is contained in the packaging member.

[0030] The high-temperature opening seal portion provided in the electron beam heating packaging member of the present invention is sealed when the packaging member is cold or at a temperature not higher than the heating temperature, and is heated to approximately 90 ° C or higher. The seal portion is soft and the seal is opened. By having the seal portion having such a structure, in the packaging member containing the food, the seal portion is sealed when the food is stored, so that the food moves to the hook surface fastener and stains the hook surface fastener. If the food is heated to 90 ° C or higher with a microwave oven, the seal is broken, and the water vapor generated from the food moves smoothly to the hook surface fastener engaging portion, and the gap force of the hook surface fastener is moderate. It is possible to complete the heating of the food while safely releasing the heat.

[0031] The above invention will be described below in more detail with reference to the drawings.

 FIG. 4 is a schematic plan view showing another example of the packaging member for electron beam heating according to the present invention, and FIG. 5 is a schematic sectional view taken along line XX of the packaging member of FIG.

 In Fig. 4, the upper and lower ends 2 and 3 of the continuous tube-shaped molded body 1 having a resin film strength are provided with a sealed portion, and two hook hook-and-loop fasteners are engaged on the inner side (inner edge side) of the upper end portion 2. An engagement part 4 is provided. Further, a high temperature opening seal portion 9 is provided inside the engagement portion 4. As shown in FIG. 5, the hook-like engagement elements 5, 6 of the hook surface fasteners facing each other engage with each other, and the engagement portion 4 by hook surface fastener engagement has a fine gap therebetween.

FIG. 6 is an enlarged schematic cross-sectional view of the high-temperature opening seal portion in the present invention. The high temperature unsealing seal portion 9 is a force that can be formed into various shapes as required. Specific examples thereof are shown in FIGS. 6 (A) and 6 (B).

 In (A) of FIG. 6, two strips of heat-softening resins 10 and 11 are provided on the inner surface of the continuous tubular molded body 1. The resin is heated to a temperature above the softening temperature and sealed by pressure bonding. When the resin 1S is reheated and softened, the pressure-sealing part is separated and the seal is opened.

 FIG. 6B is another example of the high-temperature opening seal portion, and has a structure in which a rail-like continuous protrusion 12 is fitted into the thermosoftening resin 13. The rail-shaped protrusion 12 is firmly fitted into the resin 13 at room temperature, and when the resin 13 is heated and softened, it is easily removed from the resin and the seal is opened. The shape of the ridge and heat softening resin can be arbitrarily changed according to the purpose.

[0033] The resin used for the high-temperature opening seal part can be used without limitation as long as it has no eluate and has the desired heat softening property, and copolymerized polyolefin is a particularly preferred example.

The heat softening resin used in the present invention is softened to such an extent that the heat softening resin in contact with the heat softening resin is separated when heated at 90 ° C for about 1 minute in the presence of dry heat or water vapor. Alternatively, the resin softens so that the resin pieces inserted into the resin can be easily taken out. 90 ° C need not be strict, as long as it softens at a temperature of about 80-95 ° C!

[0034] In addition, the resin film constituting the packaging member, the hook surface fastener and the heat-softening resin resin are bonded to each other at a temperature of 100 to 110 ° C by using heat fusion or a hot-melt adhesive. It is desirable to have a durable adhesive.

[0035] As a method for charging food into the packaging member, for example, a food inlet is provided on the side opposite to the opening in the packaging member, the food containing moisture is contained, and the inlet is opened after deaeration. What is necessary is just to seal again and to make a sealing part. At this time, the temperature of the food must be adjusted to be lower than the soft temperature so that the high-temperature opening seal is maintained.

[0036] When the packaging member containing the food is heated in the range, the sealing portion at the upper end portion 2 of the packaging member and the engaging portion 4 by hook surface fastener engagement are separated in advance, and the hook surface fastener is connected. Keep the joints in contact with the outside air. In order to easily separate the sealing portion at the upper end portion 2, it is preferable to provide an opening notch 7 between the sealing portion and the hook surface fastener engaging portion. The shape of the packaging member is not limited to a bag shape as shown in FIG. 4, but may have a dish-shaped bottom surface, and the upper portion thereof may be covered with a film so as to be integrated.

 Example

 [0037] Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited to these Examples.

[0038] Reference Example 1

Polyethylene 50 weight _^0/0 melt index of 5, the composition melt index of polypropylene 50% by weight is 1 by melt extrusion, to obtain a molded hook surface fastener scratch. The resulting molded hook hook-and-loop fastener has a substantially mushroom-shaped engagement element, the height of the engagement element is 1.5 mm, the element density is 30 Zcm, the width is 25 mm, and the length is 10 cm. Was 75 g. This molded hook hook-and-loop fastener was fused to a polyethylene plate at 140 ° C. for 1 second. Next, a polyethylene sheet for a display board having a width of 7 cm and a length of 10 cm with a nap nonwoven fabric attached to the back surface was prepared, and the back surface of the display board was engaged with a hook surface fastener fused to the polyethylene plate. The hook hook-and-loop fastener had little heat shrinkage and was firmly fused with the polyethylene plate, and also engaged well with the nap nonwoven fabric of the display board. The engagement peel test was repeated 100 times for this display board. There was no influence on the fusion between the fastener and the polyethylene plate.

 [0039] Reference Example 2

The yarn且成product polyethylene 30 weight melt index of 5 _^0/0 and melt index are made of polypropylene 70% by weight is 1 by melt extrusion, to obtain a molded hook surface fastener. The obtained molded hook hook-and-loop fastener is a hook hook-and-loop fastener with an engagement element height of 2 mm, an element density of 75 Zcm ² , a width of 6 mm, and a length of 12 cm, which is substantially mushroom-shaped, and its bending resistance is l lOg. It was. Next, melt at 180 ° C for 1 second so that the two hook hook-and-loop fasteners engage with each other inside the horizontal opening of a 12cm horizontal and 20cm vertical bag-shaped packaging member made of polypropylene film. I wore it. The polypropylene film and the molded hook surface fastener were firmly fused without thermal shrinkage. The opening of the obtained packaging member with a hook-and-loop fastener at the opening was easier and more reliable than the rail-shaped zipper. The opening test of the opening was repeated 100 times, but there was no change in the fusion state and engagement force of the hook hook-and-loop fastener. Also, there was no effect on the engagement between force hook hook-and-loop fasteners when the bag was heated at 80 ° C.

[0040] Reference Comparative Example 1

 The hook surface fastener was molded in the same manner as in Reference Example 1 except that the composition of the composition was changed to 5% by weight of polyethylene and 95% by weight of polypropylene, and the obtained hook surface fastener was used in Reference Example 1. We tried to fuse it to the same polyethylene plate under the condition of 140 ° C for 1 second. When the time was extended to 2 seconds, deformation occurred in the plate, so the conditions were changed to 145 ° C for 1 second, but this also caused deformation in the plate, which was a force that did not allow good fusion.

[0041] Reference Comparative Example 2

A hook surface fastener was molded in the same manner as in Reference Example 1 except that the composition was changed to 75% by weight of polyethylene and 25% by weight of polypropylene, and the bending resistance was 40 g. This hook hook-and-loop fastener was fused to the opening of the polypropylene film packaging member in the same manner as in Reference Example 2. When the obtained bag was heated at 80 ° C., the hook surface fastener provided in the opening became too flexible, the engagement of the hook surface fastener was easily released, and the bag was opened. [0042] Example 1

Using a polypropylene film, a bag-like packaging member (12 cm × 20 cm) as shown in FIG. 1 was produced. Two molded hook hook-and-loop fasteners obtained in Reference Example 2 were heat-sealed and fixed so as to engage with each other inside the opening. The hook surface fastener had an engagement element height of 2 mm, an element density of 75 Zcm ² , an element array of 4 elements, and a width of 6 mm. The water vapor permeability (VP) at the engaging portion of the hook surface fastener was 50 cc Zm'min, and the engagement separation pressure (PER) was 2. OkgZcm.

 Two commercially available frozen sweet potatoes (Shaomai) were placed in the packaging member, and the opening edge was melt-sealed to form an opening sealing part, which was stored in a freezer for one day. The packaging member was taken out of the freezer, the opening sealed part was cut off, and then heated in a home microwave oven (frequency 2450 MHz). One minute later, the hook surface fastener engaging part water vapor began to leak, and after 1 minute 30 seconds, the bag became full and the amount of water vapor leaked increased, but the hook surface fastener engagement was maintained. After 2 minutes, the heating was stopped, the packaging member was opened on a plate, and the cake was taken out. The cake was not sticky and was heated well.

[0043] Example 2

The first molded hook hook-and-loop fastener (manufactured by Kuraray Fasung Co., Ltd.) having a substantially mushroom-like engagement element is one with an engagement element height of 5 mm, an element density of 20 Zcm ² , an element array of 4 elements, and a width of 6 mm. As a second molded hook hook-and-loop fastener (manufactured by Kuraray Fas Jung) having a substantially mushroom-like engaging element, the height of the engaging element is 2 mm (the height of the engaging element in the first hook hook-and-loop fastener). A packaging member was prepared in the same manner as in Example 1 except that the hook surface fastener engaging portion was configured using a 3 mm difference), an element density of 20 Zcm ² , an element row of 4 and a width of 6 mm. In the hook surface fastener, the water vapor permeability of the engaging portion was 180 ccZm · min, and the engagement separation pressure was 3.5 kgZcm.

 In the same manner as in Example 1, two frozen sweet potatoes were accommodated and subjected to range heating for 2 minutes. As a result, the hook surface fastener engaging portion water vapor leaked and the sweet potato was heated well.

[0044] Example 3

A polypropylene film packaging member shown in FIG. 3 having a bottom surface of 15 cm X 15 cm and a height of about 12 cm is produced, and a molding film having two substantially mushroom-like engagement elements inside the opening. A hook-and-loop fastener (manufactured by Kurarayasu Jung) was fused so as to be engaged. The hook surface fasteners had engagement element heights of 2.5 mm and 2 mm (height difference of 0.5 mm), an element density of 250 Zcm ² , an element array of 4 elements, and a width of 6 mm. The water vapor permeability at the hook hook-and-loop fastener engagement is lOccZm • min, and the engagement / separation resistance is 2 Okg / cm.

 Two hand towels lightly squeezed with cold water were placed in the resulting packaging, and heated with a household microwave oven for 3 minutes with the hook surface fastener engaged. About 2 minutes later, water vapor started to leak, and water vapor leaked actively for about 1 minute. When the hand towel was taken out after heating, a hand towel heated to 80 ° C or higher was obtained.

 In addition, when the packaging member is washed with water and contains medical plastic gloves with a small amount of water remaining inside the glove and a small amount of water, the hook surface fastener is engaged and heated in a home microwave oven for 5 minutes. It was possible to sterilize well.

[0045] Comparative Example 1

 In Example 3, the packaging member is the same as Example 3 except that the head of the engaging element of the molded hook hook-and-loop fastener has a diameter of about 1.5 mm and the height of both engaging elements is 5 mm. Was made. The resulting packaging member had a water vapor permeability of 120 cc Zm'min at the hook hook-and-loop fastener engaging portion and an engagement separation pressure of 6. OkgZcm. The resulting packaging member was unsuitable as a packaging member because the engagement force of the hook hook-and-loop fastener was too strong and the engagement peeling was difficult.

[0046] Comparative Example 2

 A packaging member similar to that of Example 3 was produced except that the heights of the engaging elements of both molded hook surface fasteners were the same (2.5 mm). The water vapor permeability at the hook surface fastener engaging part was 0.3 ccZm'min, and the engagement separation pressure was 2. OkgZcm. As in Example 1, the towel for toweling was accommodated and heated in the range. As a result, the water pressure leaked from the hook hook-and-loop fastener engaging part was too high, and the engaging part was ruptured.

[0047] Example 4

A bag-shaped packaging member (15 cm × 20 cm) was produced using a polypropylene film. Two molded hook surface fasteners (manufactured by Kurarayasu Jung Co., Ltd.) having substantially mushroom-like engaging elements were fused inside the opening of the packaging member so as to engage with each other. The hook hook and loop fastener The height of the engaging element is 2 mm, the element density is 75 Zcm ² , the element row is 4 and the width is 6 mm, the water vapor permeability at the engaging part of the hook-and-loop fastener is 50 cc Zm'min, the engagement separation pressure resistance The force was 2. OkgZcm.

 Underneath (inner side) the hook hook-and-loop fastener engaging portion, a polyethylene heat-softening resin and a polypropylene rail strip were fused to a polypropylene film, respectively. The resulting packaging member is heated to 90 ° C, rail-like protrusions are inserted into the softened resin, cooled to room temperature to form a high-temperature opening seal, and the outside (opening edge) Was sealed and the upper end portion was used as an opening sealing portion to obtain a packaging member as shown in FIG.

 A food inlet was provided on the side opposite to the sealed opening of the packaging member, and the hamburger with sauce was accommodated and deaerated, and then the inlet was fused to form a lower end sealing part. The packaging member was swung or pressed by hand at room temperature, but the high-temperature opening seal part was not broken in the packaging member, and the source also passed through the seal part.

 The upper sealing part of the packaging member was opened and removed, so that the hook surface fastener engaging part was in contact with the outside air. The packaging member was heated in a home microwave oven while leaning against the dish. About 1 minute later, the high-temperature opening seal part opened, and heating continued with water vapor leaking from the hook surface fastener engaging part. After heating for about 2 minutes, a well-heated hamburger was obtained.

Example 5

The first hook hook-and-loop fastener has a substantially mushroom-like engagement element, the engagement element height is 5 mm, the major axis of the head of the engagement element is lmm, the element density is 20 Zcm ² , and the element row is 4 A molded hook hook-and-loop fastener having a width of 6 mm (manufactured by Kuraray Jung) was prepared. The second hook hook-and-loop fastener has a substantially mushroom-like engaging element, the height of the engaging element is 2 mm (the difference in height from the first hook hook-and-loop fastener is 3 mm), and the element density is 20 mm. A molded hook hook-and-loop fastener (manufactured by Kurarayasu Jung Co., Ltd.) having Zcm ² , 4 element rows and 6 mm width was prepared. A packaging member was produced in the same manner as in Example 4 except that these were used to configure the hook surface fastener engaging portion. The water vapor permeability at the engaging portion of the hook surface fastener was 180 ccZm * min, and the engagement separation pressure was 3.5 kgZcm.

In the same manner as in Example 4, the vegetables were boiled and heated in the range for about 3 minutes. Until the steam was generated, the broth was blocked by the high-temperature opening seal part, and then the high-temperature opening seal part was opened, and water vapor leaked from the hook surface fastener engaging part. The resulting boiled vegetables were well heated.

Industrial applicability

 The packaging material for electron beam heating of the present invention includes frozen foods such as sweet potato, eggplant, buns with ingredients, fried rice, various cooked foods such as boiled fish, boiled vegetables, hamburger, curry and stew. It can contain water-containing fiber goods such as wet towels (wet towels) and provide them to consumers. Furthermore, it can be suitably used for sterilization of articles for heat sterilization.

Claims

The scope of the claims  [1] An electron beam heating packaging member made of thermoplastic resin, wherein two hook hook-and-loop fasteners having hook-like engagement elements are provided in the opening of the packaging member so as to engage with each other. The engagement portion formed by the two hook surface fasteners has a water vapor permeability of 0.5 to 200 cc Zm * min with respect to water vapor at 100 ° C., and is 0.5 in the presence of the heat water vapor. 5. A packaging member for heating an electron beam, characterized by having an engagement / separation pressure resistance of OkgZcm. [2] The hook member for heating an electron beam according to claim 1, wherein the hook member is a molded hook hook and loop fastener in which substantially mushroom-like engaging elements are erected at a density of 10 to 300 Zcm ² on the substrate.  [3] Two hook hook-and-loop fasteners are molded hook-and-loop fasteners each having a substantially mushroom-like engaging element standing on a substrate, and the first hook hook-and-loop fastener engaging element and the second hook hook 2. The packaging member for heating an electron beam according to claim 1, wherein a difference in height of the engaging elements of the fastener is 0 to 5. Omm.  4. The packaging member for electron beam heating according to claim 1, wherein food is contained in the packaging member for electron beam heating.  5. The packaging member for heating an electron beam according to claim 4, wherein the opening edge sealing portion is further sealed to form an opening sealing portion.  6. The packaging member for electron beam calorie heat according to claim 1, wherein a water-containing fiber article is accommodated in the packaging member for electron beam heating.  7. The electron beam heating packaging member according to claim 1, wherein the electron beam heating packaging member contains an article for heat sterilization.  [8] Surface fastener engagement in which two hook hook-and-loop fasteners having a high-temperature opening seal portion and a hook-like engagement element are engaged with each other in the direction toward the outer edge of the opening in the electron beam heating packaging member 2. The packaging member for heating an electron beam according to claim 1, wherein an opening portion sealing portion in which an opening portion and an opening edge are sealed are provided in order.  9. The packaging member for heating an electron beam according to claim 8, wherein the high-temperature opening seal part is formed so as to soften at a temperature of 90 ° C. or higher and to open the seal part. 10. The packaging member for heating an electron beam according to claim 5 or 8, wherein an opening notch is provided between the hook-and-loop fastener engaging portion and the opening sealing portion. 11. The electron beam heating packaging member according to claim 1, wherein the thermoplastic resin constituting the electron beam heating packaging member is a polyolefin resin selected from the group force consisting of polyethylene and polypropylene. [12] polyethylene榭脂10-70wt _^0/0 The hook surface fastener force a melt index of 3 to 20, made of polypropylene榭脂90-30 wt _^0/0 melt index of from 0.7 to 3 2. The packaging member for heating an electron beam according to claim 1, which is a molded surface fastener formed by melt-molding the composition.