JPH10305868A - Armoring material and stick-shape packaged body using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metallic tone stick-shape packaged body, whose contents can be taken out singly and which is substituting a plastic film which is easy to supply for a moisture proof for cellophane whose production is decreasing, with a quality for packaging, i.e., mainly dead fold quality in packaging, a quality for tearing and opening in opening and using, and a quality for protecting a pattern layer. SOLUTION: This armoring material 10 comprises at least a plastic film having a heat seal layer 6, a pattern layer 2 provided as the need arises, a paper layer 4 and an aluminium foil layer 5 laid one after another in the order. The plastic film constitutes a stick shape packaged body using a gamma ray irradiated film 1, the armoring material 10 preferably formed in a biaxially stretched polyropylene film and the same. Therefore, the plastic film is the biaxialy stretched polypropylene film and also is irradiated with 10-200 kgy gamma rays.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plurality of plate-shaped chewing gums or block-shaped candies (2 to 10 or 2 to 10).
Individual) An exterior material having rigidity, suitability for folding, suitability for cutting (easy tearing property), and a sticker using the same, which can be taken out one by one, as a laminate for forming a stick-like package used in an integrated package Belonging to the shape package.

[0002]

2. Description of the Related Art Conventionally, a stick-shaped package shown in FIG. 2 for packaging a plurality of contents such as a plate-shaped chewing gum and a block-shaped candy for display and sale is provided by individually wrapping or labeling the individual contents. Later, lined up with “exterior material”
A stick-shaped package fixed and packaged was used. Then, even after the outer packaging material is torn along the cut tape 15 from the opening portion 13 having the double I notch and opened to take out a single content, a packaging material having a packaging function of maintaining the accumulation state of the remaining content is provided. Had been used. The exterior material has a design (surface gloss), the protection of the picture layer (surface strength of the exterior material that prevents the picture layer from falling off when stored and used in a pocket or bag), and the flavor of the contents. It is required to maintain the outer shape retention of the package (rigidity for maintaining the folded shape when packaged, sealed state) at the same time as preservability. Therefore, the picture layer of the exterior material is printed on the back surface of a strong transparent film, laminated with paper or aluminum foil, and is configured not to fall off due to friction in a bag or a pocket. In addition, when the contents are collected and packaged on the packaging material, the content is correctly folded at a predetermined position, and the position and shape are maintained (hereinafter, the state where the folded position is maintained is referred to as "dead fold". )), Which is required to be sealed with a heat sealant layer applied to a base film or a heat sealant supplied by a packaging machine.

Further, in order to open the package, take out the contents one by one, and eat the contents one by one, the package is neatly torn from the end of the package along a cut tape provided with a double I notch on the exterior material, and further, optionally. Is required to be capable of tearing in the direction of.

Conventionally, a packaging material that satisfies the above performance is printed on a moisture-proof cellophane having a transparent film and a heat-sealing layer, and the printed surface and roll paper for packaging material such as imitation paper are formed by an ordinary method. Laminates in which paper and aluminum foil are further laminated and formed by ordinary wet lamination, dry lamination, or sandwich lamination using a molten resin such as polyethylene have been used. The moisture-proof cellophane used for the above-mentioned laminate is excellent in cutting suitability for uniformly tearing from the end and deadfold. Therefore, with moisture-proof cellophane,
The laminate composed of paper having excellent deadfold properties and aluminum foil was an exterior material having excellent cutting suitability and deadfold.

On the other hand, a laminate in which the moisture-proof cellophane is replaced by another thermoplastic film is inferior in cutting suitability (the tear strength and piercing strength of the film is high), and the rebound force when folded (dead fold property). There is no). Therefore, not only is the shape (folding angle) of the package formed when the package is folded formed, but also when the package is folded and heat-sealed with a hot melt or the like, the plastic film and the aluminum foil on the surface are as shown in FIG. There is a problem that the hot melt or the like rebounds and separates before cooling and solidifying without forming the body seal portion and the side seal portion in a tight contact state. When a stretched film is provided with a double I notch and a cut tape, the film tears in the stretching direction of the film, but when no cut tape is provided, tearing from the double I notch lacks stability. However, the tearing width was so narrow that it was impossible to make one round of cutting.

On the other hand, moisture-proof cellophane consumes a large amount of water in the production process, and the cost for detoxifying and treating by-product sulfur compounds becomes a bottleneck, and the production tends to be reduced. Therefore, an attempt was made to use a plastic film instead of the moisture-proof cellophane, but none of them could satisfy the above-mentioned dead-fold property, cutting suitability (easy tearing property), and appropriate rigidity.

[0007]

[0005] Even if the moisture-proof cellophane whose production is shrinking is replaced with a plastic film that can be easily supplied, it is suitable for printing and lamination in processing, deadfolding in packaging, and cutting aptitude in use. It is another object of the present invention to provide an exterior material and a stick-shaped package that can satisfy the protection of a picture layer provided if necessary.

[0008]

Means for Solving the Problems To solve the above problems, the present invention provides a laminated sheet comprising at least a plastic film having a heat seal layer, paper and aluminum foil, wherein the plastic film is
It is a packaging material irradiated with gamma rays. The plastic film is a biaxially stretched polypropylene film, and is a packaging material irradiated with 10 to 200 kgy of gamma rays. And it is a stick-shaped package using an exterior material in which a gamma ray-irradiated plastic film, paper and aluminum foil are sequentially constituted.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, according to the present invention, a gamma ray-irradiated plastic film 1 having a heat seal layer (hereinafter, referred to as an HS layer) 6 is provided with a side on which an HS layer is not provided. An exterior material 10 in which a picture layer 2 provided as required, a paper 4 and an aluminum foil 5 are sequentially laminated.
The lamination of each layer is performed by an ordinary method via the adhesive resin layers 31 and 32. And the plastic film 1
Is a laminated material 10 of a biaxially stretched polypropylene film irradiated with 10 to 200 kgy of gamma rays. And
A stick-shaped package 110 using a packaging material 10 in which a gamma ray-irradiated plastic film 1, a picture layer 2 provided as required, a paper 4 and an aluminum foil 5 are sequentially arranged.

The plastic film used in the present invention is irradiated with gamma rays such as polyethylene terephthalate, polypropylene, polycarbonate, polystyrene, polyamide, polyvinyl chloride, saponified ethylene / vinyl acetate copolymer, and cellulose acetate, and is required for packaging suitability. It can be selected from a stretched or unstretched film having a sliding. The thickness of the film depends on the type of polymer, but is 6 ~
25 μm. If it is less than 6 μm, the film production, printing and lamination steps with other films are unstable,
Above m, there is a problem that the rigidity of the plastic film is strongly exhibited, so that no dead-fold property is exhibited and the tearing resistance is increased. Preferably 12 to 20μ
m is a stretched polypropylene film.

The irradiation amount of gamma rays applied to the plastic film used in the present invention varies depending on the film, but is preferably 10 to 200 kgy to such an extent that an unirradiated film can be easily torn. If it is less than 10 kgy, the film becomes brittle and cannot be given tearing properties. If it exceeds 200 kgy, there is a problem that the film emits an odor and is easily cut in the printing / lamination process. Irradiating the raw plastic before film formation with gamma rays is not a preferable method because film formation suitability is impaired.

It is preferable that the plastic film used for the exterior material contains an antistatic agent or is coated on the surface to have an antistatic property, and to prevent dust from adhering to stores and distribution processes. The antistatic agent can be used in an appropriate amount from those commonly used to those suitable for the properties of the plastic.

The HS layer 6 provided on the plastic film 1 of the present invention is formed on the outermost layer of the laminated material. It is desirable that the HS layers can be heat-sealed with each other, and at the same time, can promote the adhesion of the laminated material to the heat-sealing agent used for sealing the body. The HS layer 6 can be formed by coating on the entire surface of the film, or only the necessary portions, for example, the stick-shaped package 110 and the body sealing portion 116 of FIG.
The body seal portion HS layer 11 and the side seal portion HS layer 12 shown in FIG. 3 can be partially formed by gravure printing at positions corresponding to the side seal portions 126. Also,
Although not shown, the side seal HS layer 12 may be formed in a pattern only at the heat seal portion that comes into contact when folded.

The HS layer 6 is made of a vinyl chloride / vinyl acetate copolymer, linear polyester, polyvinyl butyral,
A heat seal lacquer mainly composed of a thermoplastic resin such as polyamide composed of dimer acid and glycols,
Hot lacquer consisting of ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer, tackifier, wax, solvent (at room temperature, liquid or gel-like Heat to give fluidity, perform printing or coating, evaporate volatile components and remove H
(Forming an S layer).

The picture layer 2 is preferably formed by a rotary printing machine using gravure printing, silk screen printing or flexographic printing suitable for printing and laminating a thin plastic film. The printing ink adheres to the plastic film from the usual plastic film ink, and is suitable for the adhesive resin layer (the binder of the picture layer can also act as a primer layer for the adhesive resin layer), and packaging. It is carried out by selecting from a binder having heat sealing suitability which does not peel off due to heat when the material is heat-sealed, and an ink using a coloring agent mainly containing a pigment.

The paper 4 constituting the laminate of the present invention can be appropriately selected from roll paper used for packaging. For example, pure white roll paper, single gloss kraft paper, imitation paper, glassine paper, Indian paper, tissue paper, imitation paper, coated paper, etc.
0 to 150 g / m ² can be selected. If the basis weight of the paper is less than 20 g / m ² , the rigidity of the laminate cannot be obtained,
If it is more than g / m ² , not only resources are wasted, but also the rigidity is too strong and it is difficult to fold it in a packaging machine.

A plastic film 1 provided with a picture layer 2
And paper 4 are laminated by dry lamination (lacquer lamination containing a solvent in the adhesive or non-solar lamination not containing a solvent) using an adhesive resin layer 31 made of a normal reaction-curable adhesive or an adhesive. Or
Further, if necessary, a primer layer is provided on the pattern layer 2 and a thermoplastic resin such as polyethylene extruded by hot-melt is laminated by sandwich lamination with the adhesive resin layer 31. Water-dispersed polyvinyl acetate and vinyl acetate
It is also possible to laminate by wet lamination using an adhesive selected from dispersion of acrylic acid ester copolymer, casein, aqueous solution of starch or the like, alone or as a mixture. The moisture contained in the paper is arbitrarily changed by wet lamination (for example, when the residual water content is large, for example, 7% or more, the rigidity is small, and when it is 5% or less, the rigidity can be made to be a rigid laminate). Deadfold suitability and rigidity can be adjusted.

As the aluminum foil 5, a material obtained by annealing and removing oil during rolling from a soft aluminum foil of 7 to 20 μm used for an ordinary packaging laminate is selected. If the removal of the rolling oil is incomplete, the wetting of the adhesive is not only unstable, but also the rolling oil exudes from the aluminum foil due to the heat when the laminate is sealed by heat sealing, and May peel at the interface.

The adhesion between the paper 4 of the present invention and the aluminum foil 5 is achieved by bonding ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic ester copolymer, etc. with rosin or rosin-modified maleic acid. Mixture of resin, rosin-modified phenol resin, etc. and ester of glycene or pentaerythritol, tackifier such as terpene resin, petroleum wax such as paraffin wax, microcrystalline wax, and synthetic rubber such as polyisobutylene and polybutene (adhesive resin Layer 32) from 15 to 30
Lamination can also be performed by hot-mel lamination performed by applying g / m ^2, or sandwich lamination or wet lamination described above. Further, when laminating by wet lamination, the deadfold property and rigidity of the laminated material can be adjusted by arbitrarily changing the moisture contained in the paper.

On the innermost layer of the aluminum foil 5 of the laminated material of the present invention, although not shown, the adhesion with the adhesive supplied by the packaging machine when filling the contents is firmly stabilized and the metal aluminum In order to prevent deterioration, it is preferable that the primer layer is provided by applying an “adhesion promoter” for the purpose of promoting the adhesion with the adhesive. The adhesion promoter is selected according to the type of the adhesive, but in the case of the above hot melt, polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic ester copolymer, It is preferable to provide a vinyl chloride / vinyl acetate copolymer, a linear polyester, a ceramic or the like with a minimum thickness of 0.5 to 15 μm.

Hereinafter, embodiments will be described in more detail with reference to the drawings.

EXAMPLE A desired pattern layer 2 is provided on one side of a 15 μm-thick biaxially oriented polypropylene film (plastic film 1) having the properties shown in Table 1 and irradiated with a gamma dose by gravure rotary printing, and at the same time as other layers. The surface corresponding to the body seal portion 116 and the side seal portion 126 shown in FIG.
The layer 6 (the body seal pattern 11 and the side seal pattern 12 as shown in FIG. 3) was gravure printed at a thickness of 1 μm (solid content). Further, a vinyl acetate / acrylic resin-based dispersion (adhesive resin layer 31) was applied to the picture layer 2, and the imitation paper 4 having a basis weight of 35 g / m ² was laminated by wet lamination. And the paper surface 4 and the thickness 7 μm
The aluminum foil 5 was sandwiched and laminated with low-density polyethylene (the adhesive resin layer 32) to form the exterior material 10 of the present invention.

[0022]

Comparative Example An HS layer 6 and a picture layer 2 were prepared in the same manner as in the example except that a 15 μm-thick biaxially stretched polypropylene film treated with a gamma dose and a dampproof cellophane # 300 were used. , Paper 4 and aluminum foil 5 were laminated in this order to form the exterior materials of Comparative Examples 1 to 4.

Table 1 shows the evaluation of the plastic film, the moisture-proof cellophane and the laminate used in the above Examples and Comparative Examples for the following items. Tear strength: The tear strength of the used plastic film and laminate is measured and calculated based on JIS K7128 "Tear test method for plastic films and sheets 9. Method B (Elmendorf tear method)". Tear Initiation: The double I notch provided on the prepared laminate is pinched with the tip of a nail, and the left and right hands are used as a starting point to pull in the opposite direction, and the difficulty of starting the tear is sensuously evaluated. ：: Tearing can be easily started. Δ: The plastic film slightly extends, but tearing can be started by hand. ×: Tearing was not possible due to inhibition by the plastic film. Puncture strength: Measured with a 0.5R punch in accordance with Ministry of Health and Welfare Notification No. 20 of 1982, "Testing Methods for Instruments or Containers and Packaging in General". (Below)

[0024]

[Table 1]

[0025]

According to the present invention, the invention is intended to provide a stick-like package which is made of a plastic film which has high tear strength and poor tear initiation when a plastic film is used. It is a laminated body that has been made easier. Plate-shaped chewing gum,
From the stick-shaped package in which a plurality of block-shaped candies are packaged, the laminated body can be appropriately torn to remove and remove the contents. Moisture-proof cellophane, whose production is shrinking, is replaced with an easily supplied plastic film, and the design, protection of the picture layer, tearing, and deadfolding properties have moderate rigidity and can be taken out one by one. This has the effect of providing an exterior material.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a cross section of an exterior material of the present invention.

FIG. 2 is a perspective view showing a packaging form of a stick-shaped package.

FIG. 3 is an example showing a pattern when an HS layer of an exterior material is created by printing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plastic film 2 Picture layer 31, 32 Adhesive resin layer 4 Paper 5 Aluminum foil 6 HS layer 10 Exterior material 110 Stick-shaped package 11 Body seal part 13 Opening part 15 Cut tape 116 Pattern of body seal part 12 Side seal part 126 Side Seal pattern

Claims (3)

[Claims] 1. A packaging material, characterized in that the plastic film is irradiated with gamma rays in a laminated sheet comprising at least a plastic film having a heat seal layer, paper and an aluminum foil in this order. 2. The plastic film is a biaxially stretched polypropylene film, and emits one gamma ray.
An exterior material characterized by being irradiated with 0 to 200 kgy. 3. A stick-shaped package using a packaging material in which a plastic film, paper, and aluminum foil irradiated with gamma rays are sequentially formed.