TWI723265B - Cover material and packaging body - Google Patents

Abstract

The present invention provides a cover material, which can stably perform the function of releasing fragrance from the same article within a certain period of time when articles such as fragrances contained in a container are used.

A cover material 3, which is a container 2 for accommodating an article C. The article C performs a predetermined function by performing gas exchange between the storage space and the external space, and is characterized by having: an outer layer portion 3a and an inner layer Portion 3b; the outer layer portion 3a has gas barrier properties; the inner layer portion 3b is releasably laminated on the inner side of the outer layer portion and has air permeability. The inner layer part has: a sealing layer 35 and an adhesive layer 34; the sealing layer 35 is thermally welded to the opening edge portion 2a of the container; the adhesive layer 34 is arranged on the outer side of the sealing layer and adheres the sealing layer to the outer layer. The average density of the inner layer is 0.91~0.93g/cm ³ .

Description

Cover material and packaging body

The present invention relates to a cover material, and more specifically, to a cover material for a container for storing articles, such as fragrances, deodorants, moisture absorbents, etc., by storing It exchanges gas with the external space and exerts predetermined functions such as releasing aroma, deodorizing, and absorbing moisture.

In addition, the present invention relates to a packaging body which is formed by packaging articles such as fragrances and the like with the lid material and the container.

For example, in the case of packaging liquid fragrances, when the fragrances are not used, they need to be kept in a sealed state. On the other hand, when the fragrances are used, by preventing the fragrance from overflowing, it is at the same time between the storage space and the external space. The gas exchange is carried out between them, and the volatile aromatic components need to be released to the external space.

Patent Document 1 is known as a cover material used in combination with a plastic molded container with a flange for packaging such a liquid fragrance.

The cover material is composed of a composite film formed by sequentially laminating a base film, a barrier layer, a buffer layer, an adhesive layer, and a sealing layer from the outside. The next layer is composed of an extruded layer of polyethylene resin. The sealing layer is made of polyethylene resin film. When using the fragrance, the cover material is peeled off at the interface between the buffer layer and the adhesive layer, and gas is exchanged between the storage space in the container and the external space via the adhesive layer and the sealing layer remaining on the container side. The ingredients are released into the outer space.

【Prior Technical Literature】 【Patent Literature】

[Patent Document 1] Japanese Patent No. 5257425

In the case of the invention of Patent Document 1, although the emphasis is on providing a buffer layer composed of a predetermined film between the barrier layer and the sealing layer of the cover material to improve the content resistance of the cover material, the fragrance of the content is used At the time, it did not consider the aspect of controlling the released aroma as much as possible to stably proceed for a certain period of time.

The present invention was conceived in view of the above-mentioned problems, and its object is to provide a cover material that can stably exhibit the fragrance released from the same article for a certain period of time when articles such as fragrances contained in a container are used. And other functions.

To achieve the above object, the present invention includes the following aspects.

(1) A lid material, which is a container for storing articles, the articles perform a predetermined function by gas exchange between the storage space and the outer space, and are characterized by having an outer layer portion and an inner layer portion; The outer layer has gas barrier properties; the inner layer is peelably laminated on the inside of the outer layer and has air permeability; the inner layer has a sealing layer and an adhesive layer; the sealing layer is thermally welded to the opening edge of the container The adhesive layer is arranged on the outer side of the sealing layer and the sealing layer is attached to the outer layer part; the average density of the inner layer part is 0.91~0.93g/cm ³ .

(2) The cover material as described in (1) above, wherein the sealing layer is composed of a polyolefin-based resin film; and the adhesive layer is composed of an extruded layer of polyolefin-based resin.

(3) The cover material as described in (1) or (2) above, wherein the outer layer portion has a base layer, a barrier layer, and a cushion layer laminated in this order from the outside.

(4) The cover material as described in (3) above, wherein the buffer layer is composed of a polyamide resin film; the polyamide resin film has corona formed only on the side of the barrier layer of both surfaces处理层。 Processing layer.

(5) The cover material according to any one of (1) to (4) above, wherein the peel strength between the outer layer portion and the inner layer portion is 0.4 to 1.5 N/15 mm.

(6) A packaging body comprising: a container and a lid material for accommodating articles; the aforementioned articles perform a predetermined function by gas exchange between the containing space and the external space; the lid material is thermally welded to the aforementioned container The edge of the opening is so as to cover the opening of the container; the feature is that the lid material is composed of the lid material described in any one of (1) to (5) above.

(7) The package as described in (6) above, wherein the aforementioned article is a fragrance, a deodorant, or a moisture absorbent.

The cover material of (1) above is thermally welded to the edge of the opening of the container to cover the opening of the container containing the article that performs a predetermined function by gas exchange between the storage space and the external space, thereby forming the The package body of the same article in a sealed package. When using articles, by peeling and removing the outer layer of the lid material, and passing through the inner layer remaining on the container side, the gas exchange is performed between the storage space in the container and the outer space, so that the articles contained in the container can perform The set function.

In addition, according to the cover material of (1) above, the inner layer has a sealing layer and an adhesive layer. By setting the average density to 0.91~0.93g/cm ³ , the inner layer can be stably maintained for a certain period of time. The speed of the gas exchange between the storage space and the external space can then stably perform the function of the articles contained in the container within a certain period of time.

According to the cover material of (2) above, since the sealing layer is composed of a polyolefin-based resin film and the adhesive layer is composed of an extruded layer of polyolefin-based resin, it is easy to process, has versatility, and can reduce costs.

According to the cover material of (3) above, when the article is in an unused sealed package state, high gas barrier properties can be obtained by the barrier layer of the outer layer. In addition, even if the contents of the article are fragrances, etc., the outer layer The buffer layer of the part can effectively inhibit the deterioration of the barrier layer or the occurrence of delamination between layers.

According to the cover material of (4) above, since the buffer layer of the outer layer is composed of a polyamide resin film with corona treatment applied only to the surface of the barrier layer, the pinhole resistance of the inner layer is improved. In addition, When the outer layer part and the inner layer part of the cover material are peeled off, the outer layer part becomes difficult to be broken, and the peelability is improved.

According to the cover material of (5) above, since the peeling strength between the outer layer and the inner layer is 0.4~1.5N/15mm, there is no risk of accidental peeling when it is not opened, and excellent sealing performance is obtained at the same time , It can also easily peel off the outer layer during opening.

According to the packaging body of (6) above, when the outer layer of the cover material is peeled and removed to use the article, the inner layer of the cover material having the above-mentioned structure can be stably maintained in the storage space and the outside for a certain period of time. The gas exchange rate between the spaces can then stably perform the function of the articles contained in the container within a certain period of time.

According to the packaging body of (7) above, the fragrance, deodorant or hygroscopic agent can be packaged so as to stably release the fragrance, deodorize or absorb moisture within a certain period of time.

(1)‧‧‧Packing body

(2)‧‧‧Container

(2a)‧‧‧Flange (opening edge)

(3)‧‧‧Cover material

(3a)‧‧‧Outer Department

(3b)‧‧‧Inner layer

(31)‧‧‧Substrate layer

(32)‧‧‧Barrier layer

(33)‧‧‧Buffer layer

(34)‧‧‧The next layer

(35)‧‧‧Sealing layer

(C)‧‧‧Item

[Fig. 1] A vertical cross-sectional view showing the outline of the entire package of the embodiment of the present invention.

[Figure 2] shows a partial enlarged vertical sectional view of the same package.

[Figure 3] A partially enlarged vertical sectional view showing the state of the same package after unsealing.

Hereinafter, an embodiment of the present invention will be described with reference to Figs. 1 to 3.

Figure 1 shows the overall outline of the package according to the present invention.

The package (1) shown in the figure is provided with: a container (2) and a lid material (3); the aforementioned container (2) contains an article (C); the aforementioned lid material (3) is thermally welded to the container (2) The opening edge (2a) of the container (2) so as to cover the opening of the container (2).

As the content, the article (C) contained in the container (2) performs a predetermined function by performing gas exchange between the storage space and the external space. Specifically, examples include fragrances and deodorization. Agent, hygroscopic agent.

The container (2) is made of a cup-shaped resin molded body, and has a horizontal flange (2a) at its upper opening edge. However, the shape of the container is not limited to that shown in the figure, and can be changed as appropriate.

The forming material of the container (2) can be a single-layer sheet or a composite sheet with more than two layers. The container (2) shown in Figures 2 and 3 is composed of a two-layer structured composite sheet; the outer layer (21) is composed of heat-resistant materials such as polyvinyl chloride resin (PVC) film. ; The inner layer (22) is composed of hot-melt materials such as polyethylene resin (PE) film. In addition, between the outer layer (21) and the inner layer (22), a barrier layer made of metal foil such as aluminum foil can also be interposed, thereby improving the barrier properties of the container (2).

The cover material (3) is provided with an outer layer portion (3a) having gas barrier properties and an inner layer portion (3b) that is releasably laminated on the inner side of the outer layer portion (3a) and has air permeability.

Although the illustration is omitted, the cover material (3) is provided with a protruding piece protruding radially outward from one of its peripheral edge portions as a whole.

The outer layer part (3a) of the cover material (3) has a substrate layer (31), a barrier layer (32) and a buffer layer (33) which are sequentially laminated from the outside (above in Figures 2 and 3).

The base material layer (31) is the outer surface of the cover material (3), and is composed of, for example, polyethylene terephthalate resin (PET) film, polybutylene terephthalate resin (PBT) film, and polybutylene terephthalate resin (PBT) film. It is composed of polyester resin film such as ethylene naphthalate resin (PEN) film. The thickness of the substrate layer (31) is set to about 10-50 μm.

The barrier layer (32) is used to impart barrier properties to the cover material (3) in the unopened state of the article (C) where the contents are not used, and is made of metal foil such as aluminum foil or stainless steel (SUS) foil. The thickness of the barrier layer (32) is set to about 5-50μm.

The buffer layer (33), for example, when the contents (C) are fragrances, etc., prevent the barrier layer (32) from deteriorating due to volatilized fragrance components, or the barrier layer (32) and the adhesive layer ( 34) The effect of interlayer peeling occurs between. The buffer layer (33) is preferably composed of a polyamide resin film. For the polyamide resin film constituting the buffer layer (33), it is better to form a corona treatment layer (not shown) only on the side of the barrier layer (32) on both sides, thereby enhancing the inner layer portion (3b) In addition, when the outer layer portion (3a) of the cover material (3) is peeled off and unsealed, the outer layer portion (3a) becomes difficult to break, and the releasability is improved. The thickness of the buffer layer (33) is set to be about 10-40 μm.

The inner layer part (3b) of the cover material (3) has: a sealing layer (35) and an adhesive layer (34); the sealing layer (35) is thermally welded to the flange (2a) of the container (2); the aforementioned The subsequent layer (34) is arranged on the outer side of the sealing layer (35) (above Figures 2 and 3) and the sealing layer (35) is attached to the buffer layer (33) of the outer layer portion (3a).

The sealing layer (35) is composed of a polyethylene resin (PE) film, an ethylene-vinyl acetate copolymer resin (EVA) film and other polyolefin resin films. The next layer (34) is composed of an extruded layer of polyolefin resin such as polyethylene resin (PE) and ethylene-vinyl acetate copolymer resin (EVA).

The average density of the inner layer part (3b) of the bonding adhesive layer (34) and the sealing layer (35) is set to 0.91 to 0.93 g/cm ³ . Here, the "average density" of the inner layer (3b) refers to the value calculated from the density of each layer (35) (34) measured in accordance with the D method (density gradient tube method) specified in JIS K7112 (1999). Specifically, it is as follows.

D ^OG = (D ^AD × t ^AD + D ^SL × t ^SL )/(t ^AD + t ^SL )

D ^OG : the average density of the inner layer (Out Gassing)

D ^AD : Adhesive density

t ^AD ：The thickness of the adhesive layer

D ^SL : Density of Sealant

t ^SL : the thickness of the sealing layer

Preferably, the melting point of the polyolefin resin constituting the adhesive layer (34) is higher than the melting point of the polyolefin resin constituting the sealing layer (35) by 5-25°C. Here, "melting point" refers to the value measured in accordance with the method of measuring the melting temperature of plastics specified in JIS K7121 (2012). With the above melting point difference of 5°C or more, when the lid material (3) is thermally welded to the flange (2a) of the container (2), the sealing layer (35) is adhered to, and the lid material (3) will not deviate during subsequent steps. In addition, since the above-mentioned difference in melting point is within 25°C, the buffer layer (33) does not melt, so it does not peel off from outside the target position.

The thickness of the sealing layer (35) is preferably about 30-80 μm, and the thickness of the adhesive layer (34) is preferably about 20 μm or less. Furthermore, the total thickness of the inner layer portion (3b) of the bonding sealing layer (35) and the adhesive layer (34) is preferably 35 μm to 80 μm. The gas exchange rate can be controlled by the thickness of the inner layer (3b). By setting it within the above-mentioned thickness range, for example, when the article (C) is a fragrance, a moderate fragrance can be released during use. In addition, It can be used up during the period when the fragrance of the content does not deteriorate.

The method of thermally welding the lid material (3) to the flange (2a) of the container (2) is not particularly limited, and it is desirable to use knurled sealing to obtain high sealing strength.

The cover material (3), for example, is lifted by holding the grip part so as to be between the outer layer part (3a) and the inner layer part (3b), that is, between the buffer layer (33) and the adhesive layer (34) The interface peels off. Thereby, the outer layer part (3a) is separated from the container (2), and only the inner layer part (3b) remains on the side of the container (2). The inner layer part (3b) is interposed between the storage space in the container (2) and the outside There is gas exchange between the spaces, and the fragrances and other items in the contents play the function of releasing fragrance.

The peel strength between the outer layer part (3a) and the inner layer part (3b) is preferably 0.4~1.5N/15mm, and 0.6~1.3N/15mm is further preferred. If the peel strength is less than 0.4N/15mm, the outer layer part (3a) may be accidentally peeled off when the package is not opened. On the other hand, if the peel strength exceeds 1.5N/15mm, it will be difficult to peel off the outer layer part ( 3a). Here, "peel strength" refers to the value measured under the peeling condition of 100mm/min between the 15mm wide samples next to the T-shape.

[Examples]

Next, specific embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

(Production of cover material)

On one side of a 9μm thick aluminum foil (=barrier layer) composed of AlN30H-O specified in JIS H4160 (2006), use a 2-component curing type polyester urethane resin adhesive to make the thickness 12μm Polyethylene terephthalate resin (PET) film (= substrate layer) is dry laminated.

Next, on the other side of the aluminum foil, use a 2-component curing type polyester urethane resin adhesive to apply corona treatment to only one side of the polyamide resin film with a thickness of 15 μm. (=Buffer layer) Dry laminated so that the corona treatment layer faces the aluminum foil.

On the polyamide resin film side surface of the laminate (= outer layer portion) thus obtained, a polyethylene resin (PE) film (= sealing) with a thickness of 50 μm was laminated by extrusion using polyethylene resin (PE) Layers) Stacked layers. The thickness of the polyethylene resin extruded layer (=adhesive layer) is 15μm. Here, the polyethylene resin film and the polyethylene resin extruded layer use the density and melt flow rate (MFR) shown in Table 1 below to make the laminated part of the polyethylene resin film and the polyethylene resin extruded layer (=inner The average density of the layer part) is shown in Table 1.

The five types of laminates obtained as above were cut into a substantially circular shape with a diameter of 45 mm, and cover materials of Examples 1 to 3 and Comparative Examples 1 and 2 were produced.

(Production of packaging body)

Next, the inner layer side is made of polyethylene resin (PE), and the outer layer side is made of polyvinyl chloride resin (PVC). Prepare a plurality of cup-shaped containers as shown in Figure 1 (the outer diameter of the flange is 40mm). , Inner diameter 35mm), each container is filled with 3cc of liquid fragrance. Three types of fragrances, A, B, and C are used.

Next, on the upper surface of the flange of each container containing the fragrances A, B, and C, the cover materials of Examples 1 to 3 and Comparative Examples 1 and 2 were arranged with the sealing layer facing the flange, and then the two were thermally welded. Thermal welding is performed by a knurled sealing device under the conditions of a heating temperature of 160°C, a pressure of 0.2 MPa, and a heating and pressure time of 1 second.

Through the above-mentioned steps, the packaging bodies of Examples 1 to 3 and Comparative Examples 1 and 2 were produced.

(Verification of the change in the transmittance of fragrances)

Between the polyamide resin film and the polyethylene resin extruded layer, the cover materials of the packages of Examples 1 to 3 and Comparative Examples 1 and 2 were peeled off, and only the polyethylene resin extruded layer and polyethylene resin film remained in the container side In this state, keep it at room temperature for one month in this state.

During storage, the weight of each package was measured every week, and the difference from the weight before storage was calculated to confirm the change in the permeability of the fragrance. In addition, if the transmittance change is stable within one month, it is marked as "○", and if it is unstable, it is marked as "×". The results are shown in Table 2 below.

As shown in Table 2, in the packages of Examples 1 and 2, regardless of the type of fragrance, it was found that the change in transmittance remained stable for one month, and the released fragrance was stably progressing. In addition, in the case of the package of Example 3, for some fragrances, the change in transmittance remained almost stable for one month. On the other hand, in the packages of Comparative Examples 1 and 2, the change in transmittance was not stable.

【Industrial Utilization】

The present invention can be suitably used as packaging materials such as fragrances, deodorants, and moisture absorbents.

(1)‧‧‧Packing body

(2)‧‧‧Container

(2a)‧‧‧Flange (opening edge)

(3a)‧‧‧Outer Department

(3b)‧‧‧Inner layer

(31)‧‧‧Substrate layer

(32)‧‧‧Barrier layer

(33)‧‧‧Buffer layer

(34)‧‧‧The next layer

(35)‧‧‧Sealing layer

(C)‧‧‧Item

Claims (7)

A lid material, which is a container for storing articles, the articles perform a predetermined function by gas exchange between the containing space and the outer space, and are characterized by having an outer layer portion and an inner layer portion; the outer layer portion has Gas barrier; the inner layer is peelably laminated on the inside of the outer layer and has air permeability; the inner layer has a sealing layer and an adhesive layer; the sealing layer is thermally welded to the opening edge of the container; The subsequent layer is arranged on the outer side of the sealing layer and the sealing layer is attached to the outer layer part; the average density of the inner layer part is 0.91 to 0.93 g/cm ³ . The cover material described in the first item of the scope of patent application, wherein the sealing layer is composed of a polyolefin resin film; and the adhesive layer is composed of an extruded layer of polyolefin resin. The cover material as described in the first item of the scope of patent application, wherein the outer layer portion has a base layer, a barrier layer, and a buffer layer that are sequentially laminated from the outside. The cover material as described in item 3 of the scope of patent application, wherein the buffer layer is composed of a polyamide resin film; of the polyamide resin film, corona treatment is formed only on the side of the barrier layer on both sides Floor. The cover material as described in the first item of the scope of patent application, wherein the peel strength between the outer layer portion and the inner layer portion is 0.4 to 1.5N/15mm. A packaging body comprising: a container and a lid material for accommodating articles; the aforementioned articles perform a predetermined function by gas exchange between the containing space and the external space; the lid material is thermally welded to the opening edge of the aforementioned container The part is used to cover the opening of the aforementioned container; the feature is that the aforementioned cover material is composed of the cover material described in any one of items 1 to 5 of the scope of patent application. The package described in item 6 of the scope of patent application, wherein the aforementioned articles are fragrances, deodorants or moisture absorbents.

Images