CN103517853A - Plastic wrap storage box - Google Patents

Abstract

[Problem] To provide a plastic wrap storage box that exhibits good cutting properties without a cutting implement such as a serration and which can maintain the effectiveness thereof until all of the stored film is used. [Solution] A plastic wrap storage box, which stores rolled plastic wrap and comprises: a rectangular storage chamber with an open top that is formed from the respective wall surfaces of a front board (5), a bottom board (4), a back board (6) and side boards (3); a openable cover board (2) that is connected to the upper edge of the back board (6) in the direction that covers the opening of the storage chamber; and a cover piece (1) that extends from the front edge of the cover board (2) in the direction that covers the front board (5). The storage box is characterized in that: both ends and the central part of the leading edge of the cover piece (1) are indented with V-shaped slopes; the leading edge in the two transitional sections between the three indentions is parallel to the front edge of the cover board; and both ends of the upper edge of the front board (5) are sloped downward from the center towards the ends.

Description

plastic wrap storage box

technical field

The present invention relates to a box for storing and winding plastic wrap widely used mainly for food packaging in general households, food sales businesses, and catering services, etc., and more particularly to a storage box without cutting tools such as serrations .

Background technique

Conventionally, cling film is provided, for example, as a wound film housed in a rectangular parallelepiped box as shown in FIG. use. As a method of lateral cutting, the most common method is to use elongated metal sawtooth provided on a cover sheet or the like of the case.

However, metal saw teeth have safety problems such as hurting hands, or the problem that paper boxes and metal saw teeth must be separated when discarding. In order to solve these problems, the following methods have been proposed. : Instead of sawtooth, a sheet with irregular metal powder adhered to it is used for a cutting tool (Patent Document 1), or a wound film has continuous processing scars in its longitudinal direction, and the box in contact with the processing scar region A cutting aid such as a metal sheet or a vulcanized paper sheet is partially provided (Patent Document 2). However, the above-mentioned problem of safety or separation still exists.

Furthermore, a method has been proposed in which slits are provided at fixed intervals at ends of a wound film in the transverse direction, so that the film can be cut along the slits even in a cassette without a cutting tool such as serrations (Patent Document 3). However, the conventional cassettes are merely non-serrated cassettes, and the cuttability of the film is not sufficient. Furthermore, since a part of the cassette functions as a cutter, a part of the cassette is damaged until the wound film is used up, and there is a problem that the film cannot be cut.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 61-217345

Patent Document 2: Japanese Patent Laid-Open No. 11-124133

Patent Document 3: Japanese Patent Laid-Open No. 2001-322636

Contents of the invention

Inventions to solve problems

The object of the present invention is to provide a plastic wrap storage box that can exhibit practical cutting performance even if there is no cutting tool such as sawtooth in the box that accommodates the wrap film, and can maintain this effect until the desired value. Stored film until used up.

means of solving problems

The inventors of the present invention have found after active research that in the existing plastic wrap storage box, if the front end portion of the cover sheet and the upper end portion of the front panel are partially cut off, the front edge of the cover sheet and the upper end of the front panel If the edge has a specific shape, the film can be cut satisfactorily even if there is no cutting tool such as sawtooth in the box, and the above object can be achieved.

That is, the present invention is a cling film storage box, which is a box for storing wound cling film, and includes: a cuboid storage room with an upper opening, consisting of a front panel 5, a bottom panel 4, a rear panel 6 and side panels. Each wall surface of 3 is formed; The cover panel 2 that can be opened and closed is connected from the upper end edge of the rear panel 6 to the direction covering the opening of the storage chamber; The direction extends; the plastic wrap storage box is characterized in that: the two side ends and the central part of the front edge of the cover sheet 1 are concave shapes with a V-shaped inclination, and the 2 transition zones between the 3 concave shapes The front end edge of the front panel 5 is parallel to the front end edge 7 of the cover panel, and the two side ends of the upper edge of the front panel 5 are inclined toward the bottom direction from the center toward the side ends.

The effect of the invention

The storage box of the present invention can cut the film well without any cutting tool such as sawtooth, so the problem of safety such as hurting hands or the problem of having to separate the paper box and the metal sawtooth when discarding can be avoided. .

Brief description of the drawings

[FIG. 1] It is a perspective view which shows an example of the storage box of this invention.

[ Fig. 2 ] is a front view showing an example of a masking sheet.

[ Fig. 3 ] is a diagram showing an example of a concave shape.

[FIG. 4] It is a front view which shows an example of a front panel.

[ Fig. 5 ] is a partial enlarged view showing an example of the shape of the side end portion of the upper edge of the front panel.

[ Fig. 6 ] It is a developed view of the storage box of the present invention.

[ Fig. 7 ] is a diagram illustrating the production of an enhanced mask sheet.

[ Fig. 8 ] (a) is a front view of a cover sheet with a picture of jagged teeth, and (b) is a front view of a cover sheet with a picture of a shark with its mouth open.

[ Fig. 9 ] is a diagram of a photograph taken of the surface of a film subjected to knurling processing.

[ Fig. 10 ] is a diagram of a photograph taken of the surface of a film subjected to laser processing.

[ Fig. 11 ] is a perspective view showing a conventional storage box.

Detailed ways

The plastic wrap storage box of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing an example of the storage box of the present invention. The storage box of the present invention comprises: a cuboid storage room with an upper opening formed by the walls of the front panel 5, the bottom panel 4, the rear panel 6 and the side panels 3; The edge is connected to the direction covering the opening of the storage chamber; and the cover sheet 1 extends from the front end edge of the cover panel 2 to the direction covering the front panel 5; It has a concave shape with a V-shaped inclination, and the front edges of the two transition zones between the three concave shapes are parallel to the front edge 7 of the cover panel, and the ends on both sides of the upper edge of the front panel 5 face from the center. The side ends are inclined towards the bottom.

FIG. 2 is a front view showing an example of the masking sheet 1 . As shown in Fig. 2, both side ends and the central part of the front edge of the cover sheet 1 are concave shapes with a V-shaped inclination, and the front edges of the two transitional sections between the three concave shapes are in contact with the front end of the cover panel. Edge 7 is parallel.

In this specification, the "concave shape with a V-shaped inclination" is not only the V-shaped concave shape shown in FIG. )), and a concave shape in which the vertex portion of the V is inclined and flatter than the V (Fig. 3(b) and Fig. 3(c)). That is, the term "concave shape having a V-shaped inclination" means a V-shaped concave shape, that is, a concave shape in which the apex portion of the V-shape is sharp, or a concave shape that is not sharp. In addition, although FIG. 3 shows the concave shape (B) of the center part of the front edge of the masking sheet 1, it is the same about other concave shapes (A and D).

When using the front edge of the mask sheet to cut the film extracted from the storage box, if the both sides of the front edge of the mask sheet have a concave shape (A) with a V-shaped inclination, when the film cutting starts, the film will The area in contact with the mask sheet is small, so the force is concentrated, and as a result, good film cuttability is obtained. In addition, in the concave shape (A) of both side end parts, the shape of the V-shaped vertex part may be mutually same or different.

The two inner angles (α1 and α2) of the V-shaped inclination of the concave shape (A) at both ends with respect to the front edge 7 of the cover panel are preferably 3° to 15°, respectively. When the said angle is larger than the said upper limit, the durability of a masking sheet may deteriorate. If it is less than the said lower limit, it will become difficult to manufacture a cartridge. Furthermore, there are cases where good film cuttability cannot be obtained. In addition, the concave shape of the one end portion and the concave shape of the other end portion may have the same or different V-shaped inclination angles from each other. In addition, in the concave shape (A) of one side end, the angle (α1) on the side of the central portion and the angle (α2) on the side of the side end may be the same as or different from each other.

In consideration of the rigidity and strength of the case, the depth (a1) of the concave shape (A) at both ends can be appropriately selected according to the size of the case. Generally speaking, if considering that the larger the size of the box, the lower the overall rigidity and strength of the plastic wrap storage box, and the size of the side panel 3 is at most about 100mm×100mm, then the depth (a1) can be, for example, 2mm to 12mm . Specifically, for example, when the case has a size of 45 mm×45 mm×310 mm that can house a film having a width of 300 mm in general, the depth (a1) is preferably 2 mm to 8 mm. In addition, the depth of the concave shape at one end and the depth of the concave shape at the other end may be the same as or different from each other. And the depth (a1) can be adjusted suitably by making a concave shape (A) the shape shown in FIG.3(a) - (c).

The front edge of the cover sheet has a concave shape with a V-shaped inclination in addition to the ends on both sides. As a result, the hooking between the film and the masking sheet is reduced, and the film can be cut off smoothly.

The two internal angles (β1 and β2) of the V-shaped inclination of the concave shape (B) in the center with respect to the front edge 7 of the cover panel are preferably 1° to 10°, respectively. When the said angle is larger than the said upper limit, the durability of a masking sheet may deteriorate. If it is less than the said lower limit, it will become difficult to manufacture a cartridge. Furthermore, there are cases where the snag reduction effect cannot be sufficiently obtained. In addition, in the concave shape (B) of the central part, two angles (β1 and β2) may be the same as or different from each other.

Like the depth (a1) of the concave shape (A), the depth (b1) of the concave shape (B) in the central portion is also appropriately selected according to the size of the case, for example, 1 mm to 10 mm. Specifically, for example, when the box has a size of 45 mm in length x 45 mm in width x 310 mm in width that can accommodate a normal film with a width of 300 mm, the depth (b1) is preferably 1 mm to 7 mm. In addition, the depth (b1) can be appropriately adjusted by making the concave shape (B) the shape shown in FIGS. 3( a ) to ( c ).

Both sides of the front edge of the cover sheet 1 are concave (A), the central part is concave (B), and the front edge of the two transitional sections between these three concave shapes is in contact with the front edge of the cover panel. 7 parallel. Therefore, the width (a2) of the concave shape (A) and the width (b2) of the concave shape (B) are not particularly large as long as there are two parts parallel to the front edge 7 of the cover panel at the front edge. limit. In addition, the V-shaped width (a2) of the concave shape (A) and the V-shaped width of the concave shape (B) can be appropriately adjusted by setting the respective concave shapes as shown in Fig. 3(a) to (c). width (b2).

FIG. 4 is a front view showing an example of the front panel 5 . In the storage box of the present invention, as shown in FIG. 4 , both side end portions of the upper edge of the front panel are further inclined toward the bottom direction from the center toward the side ends. If the ends on both sides are inclined in this way, when the film is pulled out from the storage box, the film can be pulled out in a straightened state by hooking the film on the angle P at which the inclination starts on the upper edge of the front panel. Generation of wrinkles on the film is suppressed, and as a result, the film can be cut well.

The angle (γ) of the inclination (C) of both sides of the upper edge of the front panel 5 relative to the lower edge 8 of the front panel 5 is preferably 5° to 25°. If the angle (γ) is smaller than the lower limit, the effect of suppressing the occurrence of wrinkles may not be obtained. When the above upper limit is exceeded, the film may be damaged. Moreover, if the angle (γ) is large, depending on the size of the storage box, the width (c2) of the opening that can be formed by the inclination (C) is reduced, and the film is not easily caught, so there is a possibility that the occurrence of wrinkles cannot be suppressed. the effect of the situation. The width (c2) is preferably from 5 mm to 25 mm.

Like the depth (a1) of the concave shape (A), the depth (c1) of the inclination (C) is appropriately selected according to the size of the case, and may be, for example, 1 mm to 12 mm. Specifically, for example, when the case has a size of 45 mm in length x 45 mm in width x 310 mm in width that can accommodate a normal film with a width of 300 mm, the depth (c1) is preferably 1 mm to 8 mm. In addition, the depth of inclination of one end part and the depth of inclination of the other end part may be the same as or different from each other.

In Fig. 4, the upper end edge of the front panel is inclined at a fixed angle from the position P to the front end. As shown in Fig. 5, the upper end edge of the front panel is parallel to the lower edge of the front panel 5 near the boundary with the side panel 3 That is enough (FIG. 5(a)), or it can be V-shaped (FIG. 5(b)). That is, the upper edge of the front panel may have an inclination (C) such that the portion P exists, and therefore may incline at a fixed angle up to the front end of the upper edge or may not incline. The shape shown in Fig. 5 allows adjustment of the depth (c1) and/or width (c2) of the inclination (C). In addition, the shapes of the inclination (C) of both end portions may be the same as or different from each other.

When the inclination (C) is V-shaped as shown in FIG. 5( b ), the angle (γ′) is preferably 80 degrees or more and less than 90 degrees from the viewpoint of the effect of suppressing the occurrence of film wrinkles.

In the storage box of the present invention, it is further preferable that the central portion of the upper edge of the front panel has a V-shaped inclined concave shape (D). Thereby, when pulling out a film from a storage case, a film can be grasped more easily.

The two inner angles (δ1 and δ2) of the V-shaped inclination of the concave shape (D) in the center with respect to the lower edge 8 of the front panel are preferably 3° to 15°, respectively. When the said angle is larger than the said upper limit, the durability of a front panel may deteriorate. If it is less than the said lower limit, the effect which makes a film easy to catch may not be acquired. In addition, in the concave shape of the central part, two angles (δ1 and δ2) may be the same as or different from each other.

Like the depth (a1) of the concave shape (A), the depth (d1) of the concave shape (D) in the central portion is appropriately selected according to the size of the case, for example, 1 mm to 12 mm. Specifically, for example, when the case has a size of 45 mm in length x 45 mm in width x 310 mm in width that can accommodate a normal film with a width of 300 mm, the depth (d1) is preferably 1 mm to 8 mm. In addition, the depth (d1) can be appropriately adjusted by making the concave shape (D) the shape shown in FIGS. 3( a ) to ( c ).

The V-shaped width (d2) of the concave shape (D) can be appropriately determined according to the width of the case, and can be, for example, 50 mm to 200 mm. Specifically, for example, when the box has a size of 45 mm in length x 45 mm in width x 310 mm in width that can accommodate a normal film with a width of 300 mm, the V-shaped width (d2) may be about 100 mm. In addition, the V-shaped width (d2) can be appropriately adjusted by making the concave shape (D) the shape shown in FIGS. 3( a ) to ( c ).

The storage box of the present invention can be produced using paper generally used for storing wrap films, for example, a white paper board having a basis weight of 400 g/m ² to 500 g/m ² . When the basis weight of the paper is small, durability problems tend to arise, and when the basis weight of the paper is large, the cost becomes high. Therefore, the basis weight of the paper is appropriately selected in consideration of required durability according to the length of the film roll to be stored. Fig. 6 is a developed view of the storage box of the present invention.

Furthermore, in the storage box of the present invention, it is preferable to attach a paper reinforcing plate to the back of the cover sheet or the front panel and the cover panel, preferably from the viewpoint of aesthetics, from the viewpoint of durability. To enhance the cover sheet or front panel and cover panel. Reinforcements to cover sheets and front panels directly improve their durability. Reinforcement of the cover panel increases the torsional rigidity of the entire box, thereby improving the durability of the entire box. As the reinforcing board made of paper, the same paper as that constituting the storage box can be used. The reinforcing plate may be prepared separately from the storage box and attached to the back surface. Alternatively, for example, as shown in FIG. 7 , a reinforcing plate 9 is integrally attached to the front edge of the cover sheet 1 , and the front edge is folded back and attached to the back side, whereby reinforcement can also be achieved. Fig. 7 is a front view of the reinforcing plate integrally attached to the cover sheet before the reinforcing plate is folded back. In this case, the size of the folded portion (length f in FIG. 7 ) is preferably 1/2 or more of the length e of the mask sheet. If it is less than this 1/2, the reinforcing effect may be insufficient. When only the cover sheet is reinforced, the upper limit of the size (length f) of the folded portion is equal to the size (length e) of the cover sheet, but the folded portion can be further extended to strengthen the cover panel. In this case, the folded portion may have a size that covers the entire surface of the cover sheet and the cover panel. It is not necessary to extend it any longer as it would reach the back panel and the carton formability would be reduced and thus not optimal.

In the storage box of the present invention, the wrapping film can be cut by using the cover sheet as a cutting tool. In order to make end consumers know that the cover sheet plays the role of a cutter, except that the description of the content is recorded on the box, it is also possible, for example, to attach a sawtooth picture (Fig. 8 (a) as shown in Figure 8 to the cover sheet ) or sharks and other animals with the image of sharp teeth opening their mouths (Figure 8(b)), etc.

The storage box of the present invention can cut the film well even without a cutting tool such as sawtooth. However, from the viewpoint of end consumers, conventional storage boxes equipped with metal sawtooth as a cutting tool are nothing more than cardboard boxes. And when they don't have this kind of cutting tool at all, they will have the question of whether they can cut it off. Therefore, a cutting aid that is extremely easy to set up may not cause doubts to the end consumer and is beneficial to field sales. Such an extremely simple cutting aid is preferable because there is little risk of injuring hands and the like and is highly safe. Specific examples thereof include fine-pored sandpaper and the like. Coarse-porous sandpaper has the possibility of peeling off abrasive grains, and thus is not suitable as a cutting aid for packaging films, especially food packaging films. As far as the peeling possibility of the abrasive grains is concerned, it can be simply judged by the 180-degree bending test whether cracks can be observed on the sand surface. For example, in the case of commercially available sandpaper (manufactured by Noritake Coated Abrasive (Noritake) Co., Ltd., water-resistant sandpaper, trade name C947H), the particle size (based on JISR6001 (1998)) is #220 and smaller than that Cracks were observed with coarse sandpaper, very fine cracks were observed with #240 sandpaper, and no cracks were observed with #320 and finer sandpaper, so it is judged that sandpaper with a particle size of at least #240 or finer than it should be used. Preferably #320 or finer sandpaper should be used. Table 1 below shows the results of the 180-degree bending test of various grain sizes of the above-mentioned commercially available sandpaper.

[Table 1]

Particle size number (grinding particle size) Abrasive paper (water-resistant type) 180-degree bending test #80(300μm) have big cracks #120(180μm) have big cracks #180(63μm) moderately cracked #220(53μm) observed small cracks #240(60μm) Very fine cracks were observed #320(40μm) No cracks #600(20μm) No cracks

The method of setting sandpaper in the storage box is not particularly limited, and the following methods are exemplified: the method of directly applying and curing the paint containing abrasive grains to the front end of the masking sheet; coating and curing the paint containing abrasive grains on the paper The method of attaching it to the above-mentioned part of the decorative box, etc.

Furthermore, the sandpaper may be provided over the entire length from the end to the end of the front end of the masking sheet, or may be provided only at a part of the full length, for example, a side end.

The storage box of the present invention is for plastic wrap, and any plastic wrap can be used as long as it has the mechanical strength to be used as a plastic wrap. Single-layer or multi-layer films of resins such as pentene-1 and polyamide have a total thickness of 3 μm to 30 μm, typically about 8 μm to 15 μm. As said mechanical strength, both the tensile breaking force of the wrap film in the longitudinal direction and the transverse direction are preferably from 1N to 15N, more preferably from 1N to 10N. In addition, in this specification, tensile breaking force is the value measured based on JISK-7127, using test speed 500mm/min, and test piece type 2.

Furthermore, the storage box of the present invention is particularly useful for storing wrap films having excellent cross-cutting properties. As such a film, the film obtained by the method described in Japanese Patent Application No. 2010-275113 specification is mentioned, for example. The film is obtained by extruding a polymethylpentene-1 resin composition containing (A) polymethylpentene to a film thickness of 3 μm to 30 μm using a T die. 100 parts by mass of pentene-1-based resin, and (B) 0.5-60 parts by mass of polybutene-1-based resin, preferably 1-25 parts by mass and/or 0.1-20 parts by mass of liquid paraffin parts, preferably 1 to 12 parts by mass, wherein the total amount of component (B) is no more than 75 parts by mass, preferably 0.6 to 75 parts by mass, more preferably 2 to 35 parts by mass, and then More preferably, it is 3-25 mass parts. At this time, the above-mentioned extrusion is preferably performed under the following conditions: the lip gap R (unit μm) of the T die, the film thickness t (unit μm), and the resin extruded from the extrusion die (dies). The ejection velocity E (unit cm ³ /hr) and the air gap (air gap) A (unit cm) of the extrusion die width per 1 cm of the composition satisfy the following formula:

15≤(1/t-1/R)·(E/At)×100≤900

Preferably, t is 5 μm to 20 μm, more preferably 8 μm to 15 μm, A is 0.5 cm to 2 cm, E is 100 cm ³ /hr or more, and R is about 300 μm to 900 μm.

In addition, the above formula refers to the deformation rate of the film until the film in the molten state coming out of the extrusion die reaches the chill roll to form a film of the final size in the case of extrusion film production using a T die. It is carried out under large conditions, in other words, in the air gap from the extrusion die to the chill roll, the film in the molten state is pulled down at a large size and at a high speed.

The aforementioned polymethylpentene-1-based resin (A) contains 4-methylpentene-1 and/or a homopolymer of 4-methylpentene-1 or 3-methylpentene-1. Or 3-methylpentene-1 and other α-olefin copolymers. The α-olefin may be used alone or in combination of two or more. Examples of the α-olefin include ethylene, propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 1-dodecene and the like.

The polybutene-1-based resin as the component (B) includes, in addition to a butene-1 homopolymer, a copolymer of butene-1 and another α-olefin. The α-olefin may be used alone or in combination of two or more. Examples of the α-olefin include ethylene, propylene, 1-hexene, 1-octene, 1-decene, 1-dodecene and the like. The above-mentioned mobile paraffin is a chemically stable substance that is liquid at normal temperature mainly composed of chain saturated hydrocarbons, and commercially available examples (trade names) include Daphne Oil CP and MORESCO (Mores Co., Ltd.) of Idemitsu Kosan Co., Ltd. Branch) Co., Ltd.'s MORESCO-WHITE, KANEDA (Kaneda) Co., Ltd.'s HICALLK, etc.

In the above-mentioned polymethylpentene-1-based resin composition, thermoplastic resins other than polymethylpentene-1-based resins (for example, polypropylene and polyethylene), liquid polybutene (hydrogenated polyisobutylene) and Additives such as liquid processing aids, antioxidants, neutralizers, anti-fogging agents, lubricants, etc. The total blending amount of the thermoplastic resin and the liquid processing aid is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, based on 100 parts by mass of the polymethylpentene-1 resin.

Moreover, if the plastic wrap stored in the storage box of the present invention can be cut with less force, the load applied to the storage box can be further reduced, and as a result, better cutting performance can be maintained until the stored film is used up. until. In order to be able to cut with less force, the membrane is provided with certain openings for cutting. Specifically, knurling processing or laser processing may be given to at least one of the ends in the lateral direction of the film, for example, in a width of 0.1 mm to 10 mm.

Knurling is a process in which a film is sandwiched between an engraved roll made of metal or the like and an engraved roll or smooth roll made of metal or high-hardness rubber, or by pressing the engraved roll onto the roll of the film. Fine embossing or damage is formed on the surface. The processing conditions should be appropriately selected according to the material of the film, and in terms of extrusion, it is usually about 10N/m-50N/m. A photograph taken of the film surface subjected to knurling is shown in FIG. 9 . The knurling process can be carried out by providing an independent step during or after the slitting process when the entire film is formed. The knurling process is performed on at least one of the ends in the lateral direction of the film, and is preferably performed on both ends so that it can be cut from either side. The processing width is usually 0.1 mm to 10 mm, preferably 0.3 mm to 6 mm.

Laser processing is a process in which a film is melted in an extremely fine area by the heat of laser irradiation, and a concave shape or hole is formed there. The laser used is not particularly limited. Examples include gas lasers such as carbon dioxide gas lasers, helium neon lasers, argon ion lasers, and excimer lasers, ruby lasers that use ruby crystals added to the medium, and ruby lasers that use titanium added to the medium. Solid-state lasers such as titanium sapphire lasers of sapphire crystals, various YAG lasers in which yttrium in YAG crystals are replaced with other rare earth elements, and Nd:YAG lasers using YAG doped with neodymium. Also, known lasers such as liquid lasers, semiconductor lasers, free electron lasers, metal vapor lasers, and chemical lasers can be used. The irradiation output is about 0.5W to 20W, and is appropriately adjusted in consideration of the thickness of the film or the processing speed. A photograph taken of the film surface subjected to laser processing is shown in FIG. 10 . Laser processing can be carried out by providing an independent step during or after slit processing when forming a full-width film. Laser processing is performed on at least one of the ends in the lateral direction of the film, and is more preferably performed on both ends so that it can be cut from either side. The processing width is usually 0.1 mm to 10 mm, preferably 0.3 mm to 6 mm.

Furthermore, if knurling processing or laser processing is performed, the effect of preventing the pulling-out end of the winding film from being strongly in close contact with the winding body and being unable to pull out can be obtained.

[Example]

Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to the following Example. The materials and measurement methods used are as follows.

Example 1

Using a coated board (basis weight of thick paper: 450 g/m ² ) coated on one side, a storage box of 45 mm in length x 45 mm in width x 310 mm in length was produced as follows, that is, the front end of the cover sheet The edge and the upper edge of the front panel have the shapes shown in Figure 2 and Figure 4 respectively, the angle and depth of the concave shape (A), (B) and (D) and the angle, depth and width of the inclination (C) are as shown in Table 2 Show. The concave shapes (A) of both sides of the front edge of the masking sheet are the same, and the inclinations (C) of both sides of the upper edge of the front panel are the same. In addition, a reinforcing plate is provided on the back surface of the cover sheet and the cover panel. As for the reinforcing plate of the masking sheet, as shown in FIG. 7 , the part integrally attached to the front edge of the masking sheet is folded back toward the back side of the masking sheet, and bonded with an adhesive. The size (length f) of this stiffener is 4/5 of the size (length e) of the masking sheet. With regard to the reinforcement board of the cover panel, the above-mentioned white paper board was cut out to be approximately the same size as the cover panel, and bonded to the back surface of the cover panel using an adhesive.

test

In the storage box obtained as described above, the wrapped wrap film (a film with a width of 300 mm and a length of 50 m wound on a paper tube with a width of 305 mm, an inner diameter of 27 mm and a thickness of 1.5 mm) was stored, and the following test was performed. The results are shown in Table 2. In addition, as a wrap film to be accommodated, a film containing 4-methylpentene-1 (MX-0020 (trade name) manufactured by Mitsui Chemicals Co., Ltd.), MFR (260° C., 5.00 kg) was used. 21g/10min) 100 parts by mass, polybutene-1 (PB8640M (trade name) manufactured by LYONDELLBASELL (LyondellBasell), MFR (190°C, 21.18N) 28g/10min) 3 parts by mass, and mobile paraffin ( A resin composition of 5 parts by mass of HICALLK-350 (trade name) manufactured by KANEDA Co., Ltd., using a T-molded film device manufactured by Nippon Steel Works Co., Ltd. with a thickness of 12 μm and The film obtained by giving knurling processing to both ends of the film in the transverse direction. The above-mentioned film-making was carried out under the conditions of a die lip gap of 400 μm, an air gap of 1.5 cm, an ejection speed of 712 cm ³ /hr, a chill roll temperature of 25 °C, and an extrusion die outlet resin temperature of 290 °C, and a vacuum chamber and an ear type were used. Jets. The knurling processing was carried out under the processing conditions of an extrusion amount of 0.2 mm, a processing width of 0.6 mm, and a processing speed of 400 m/min. The tensile breaking forces in the longitudinal direction and transverse direction of the film were 5.4N and 2.9N, respectively.

(1) Cutting test

The following test was performed 10 times, and the number of cuts that could be cut was expressed as the cutting rate (%). In this test, the stored plastic wrap was pulled out from the storage box by about 40 cm, and the cover sheet was used in the state of closing the lid. The leading edge cuts off the membrane.

(2) Durability

After the same cutting as in the test (1) was performed 100 times, cutting was attempted 10 times, and the number of cuts that could be cut in the 10 trials was expressed as the cutting rate (%).

(3) Difficulty in forming wrinkles

(3-1) The following test was attempted 10 times, and the number of cuts that could be cut was expressed as the cutting rate (%). The above test was to pull out the stored plastic wrap from the storage box for about 40 cm, and then the grip film The lid was closed with the hand pulled forward 30 degrees with respect to the width direction of the storage box, and the film was cut off by the front edge of the cover sheet.

(3-2) The following test was carried out 5 times and evaluated based on the following criteria. The above test was to visually observe the width of the hand grasping the film relative to the storage box after the film was pulled out from the storage box by about 40 cm. The wrinkled situation of the film when the film is pulled forward by 30 degrees in the direction is compared with the wrinkled situation of the film when the film is pulled out from the storage box for about 40 cm.

○: 5 times in total, the former has the same or less wrinkle formation as the latter

△: The number of wrinkle formation in the former is equal to or less than that in the latter, 1 to 4 times

X: 5 times in total, the former has more wrinkles than the latter.

(4) Easy removal of the membrane

For 10 housewife volunteers, the ease of detachment of the film when pulling out the plastic wrap from the storage box was compared with the case of the conventional storage box shown in FIG. 2 points, 1 point for being almost equal to the existing box, 0 point for being harder to hold than the existing box, and the average of the scores of 10 people were evaluated based on the following criteria.

○: The average value is 1.7 points or more

△: The average value is 0.7 points or more and less than 1.7 points

×: The average value is less than 0.7 points

Embodiment 2～Example 23 and Comparative Example 1～Comparative Example 3

The same test as Example 1 was performed using the same storage box as the condition described in Example 1 except the conditions described in Table 2. The results are shown in Table 2. In addition, in Examples 3 to 5, sandpaper (Noritake Coated Abrasive (Noritake Coated Abrasive) with a width of 10 mm) was applied to the front end of the cover sheet of the storage box so as to cover the front and back sides by 5 mm. Co., Ltd., water-resistant sandpaper, trade name C947H) is bent across the entire length of the front end and attached with double-sided tape. In addition, in Example 4, the case of the reinforcing plate without the cover sheet was used, and in Example 18, the case of the reinforcing plate without the cover panel was used. In Example 19, instead of the inclination (C) of the front panel of the storage box shown in FIG. 4 , the inclination (angle (γ′)=60 degrees) shown in FIG. 5( b ) was used. About Example 2, the film which gave laser processing instead of knurling processing was used as a housed film. Laser processing was carried out under the processing conditions of output 1W, frequency 20KHz, processing width 3mm, and processing speed 1000mm/s. About Example 5 and Example 6, the film which did not give any processing, such as knurling processing and laser processing, was used as a housed film.

Symbol Description:

1: masking sheet

2: Cover panel

3: Side panel

4: Bottom panel

5: Front panel

6: Rear panel

7: Front edge of cover panel

8: Lower edge of the front panel

9: Reinforcement board

Claims (9)

1. a kind of plastic wrap storage box, is to accommodate the box of the plastic wrap of winding, and comprises: the storage chamber of the cuboid of top opening, by front panel (5), bottom panel (4), rear panel (6) and Each wall surface of the side panel (3) is formed; an openable and closable cover panel (2) is connected from the upper edge of the rear panel (6) to the direction covering the opening of the storage chamber; and a cover sheet (1) , extending from the front edge of the cover panel (2) to the direction covering the front panel (5); the plastic wrap storage box is characterized in that: both sides of the front edge of the cover sheet (1) and the central part is a concave shape with a V-shaped inclination, the front edges of the two transitional sections between the three concave shapes are parallel to the front edge of the cover panel, and the upper edge of the front panel (5) The ends on both sides are inclined toward the bottom from the center toward the side ends. 2. The fresh-keeping film storage box according to claim 1, wherein, the V-shaped concave shapes on both sides of the front edge of the cover sheet (1) are inclined relative to the cover panel (2) The two interior angles of the front end edge of ) are 2 degrees to 15 degrees, and the two interior angles relative to the front end edge of the cover panel (2) are 1 and the inclination of the two side ends of the upper edge of the front panel (5) relative to the lower edge of the front panel (5) is 5 degrees to 25 degrees. 3. The fresh-keeping film storage box according to claim 1 or 2, wherein, the central part of the upper edge of the front panel (5) has a concave shape with a V-shaped inclination. 4. The fresh-keeping film storage box according to claim 3, wherein, the V-shape of the concave shape in the central part of the upper edge of the front panel (5) is inclined relative to the front panel (5) The two inner angles of the lower end edge are 3 degrees to 15 degrees. 5. The plastic wrap storage box according to any one of claims 1-4, wherein, the cover sheet (1) has a reinforcing plate on its back side. 6. The fresh-keeping film storage box according to any one of claims 1-5, wherein, the cover panel (2) has a reinforcing plate on its back side. 7. The fresh-keeping film storage box according to any one of claims 1-6, wherein the cover sheet (1) has sandpaper with an abrasive grain size of #320 or smaller at its front edge. 8. A plastic wrap product, the wound plastic wrap is stored in the plastic wrap storage box according to any one of claims 1-7. 9 . The wrap film product according to claim 8 , wherein at least one of lateral ends of the wrap film is subjected to knurling and/or laser processing with a width of 0.1 mm to 10 mm.

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