JP2537795Y2 - Packaging material - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging material, and more particularly to a packaging material suitable for food packaging.

[0002]

2. Description of the Related Art Conventionally, as a packaging material mainly composed of a plastic film, many materials such as a plastic envelope used for direct mail and the like are known. Many of these packaging materials are film-based, and are generally printed on a table, and some of them have writeability. If these packaging materials are diverted to packaging materials for foods, they are insufficient in moisture resistance and gas barrier properties, and cannot be used as packaging materials for foods. Further, the film-based envelope used for these direct mails uses an adhesive for sealing, and the sealing property is incomplete. Further, as a packaging material for food, for example, there is a product having a mat coat layer on the surface as a packaging material for snack food. In the case of this packaging material, in order to prevent blocking when performing front and back printing, the mat coating agent is made of polyamide resin, and the back surface ink is a laminating ink (urethane, nitrified cotton, chlorinated PP, etc.) It is manufactured. In this case, since the mat coat layer is formed of a polyamide resin, there is a drawback that when the heat sealing is performed at 180 ° C. or more, the mat coat layer shifts to the seal bar side.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a food packaging material having excellent moisture-proof properties and gas barrier properties. Another object of the present invention is to provide a packaging material capable of avoiding the occurrence of blocking when printing a pattern layer and a mat coat layer in a pattern so as to align the front and back positions in-line. It is still another object of the present invention to provide a packaging material having a mat coat layer which is not transferred to the heat seal bar side in the heat sealing step and has excellent heat resistance and writing properties.

[0004]

The above object is achieved by the present invention described below. That is, in the present invention, a plastic film is used as a surface substrate, a matte coating layer is provided on part or all of the surface, and a picture layer is provided on a part or entirety of the back surface of the plastic film. A packaging material comprising a polyethylene terephthalate film and a mat coat layer comprising a vinyl chloride / vinyl acetate copolymer resin / acryl polyol mixed resin.

[0005]

The adhesion between the mat coat layer and the picture layer is improved by using an easily adhesive polyethylene terephthalate film as a film printing substrate. By forming the matte coat layer on the front side of the base film with a vinyl chloride / vinyl acetate copolymer resin / acrylic polyol-based ink and the picture layer on the back side with a nitrified cotton-based ink,
No blocking occurs between the ink surfaces after printing. or,
By using a vinyl chloride / vinyl acetate copolymer resin / acrylic polyol resin for the mat coat layer, heat resistance during sealing is improved. Furthermore, the ink composition of the mat coat layer is made of vinyl chloride / vinyl acetate copolymer resin / acrylic polyol, and the use of a silica matting agent as the matting agent eliminates the water repellency of the conventional polyamide resin, and is more excellent. Writing aptitude.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to preferred embodiments. The easily-adhesive polyethylene terephthalate film used in the present invention is obtained by applying an adhesive to the surface of the polyethylene terephthalate film in advance. Particularly preferred easy-adhesion polyethylene terephthalate film is formed by forming a known adhesive layer such as an acrylic adhesive on the surface of an unstretched polyethylene terephthalate film and then biaxially stretching the whole, and the adhesive layer is formed extremely thin. Have been. The thickness of these films is preferably in the range from 12 to 16 μm. These easy-adhesion polyethylene terephthalate films themselves are known and can be obtained from the market and used in the present invention.

The mat coat layer used in the present invention comprises a vinyl chloride / vinyl acetate copolymer resin / acryl polyol mixed resin. In order to obtain particularly excellent heat resistance, it is preferable to use a mat coat ink using a vinyl chloride / vinyl acetate copolymer resin / acryl polyol system as a binder resin. By using such an ink, contamination of the laminate surface can be prevented and an excellent packaging material can be provided.
Various mat coating agents are known, and known mat coating agents can be used in the present invention. The matting agent is not particularly limited, but excellent writability is imparted by using a silica-based matting agent such as microsilica as one kind of the matting agent. Such a mat coat layer may be provided on the entire surface of the polyethylene terephthalate film or may be a part thereof. The thickness of the mat coat layer is preferably about ² to 4 g / m ^{2 in} terms of the solid content coating amount.

The picture layer is formed on the surface of the substrate film opposite to the mat coat layer, and can be arbitrarily formed from a known gravure printing ink. Preferably, an ink containing a nitrified cotton resin as a vehicle is used. I do. Further, there is an advantage that no blocking occurs even when the above-mentioned picture layer and mat coat layer are formed in a pattern and their positions are aligned (registered). Such a pattern layer may be provided on the entire back surface of the polyethylene terephthalate film or may be a part thereof. The thickness of the picture layer is preferably about 0.1 to 4 g / m ^{2 in} terms of the solid coating amount.

The above is the main point of the present invention. In the present invention, the polyethylene terephthalate film having the matte coat layer and the picture layer formed thereon is made of polyethylene for the purpose of further improving the strength, waist, moisture resistance, gas barrier property and the like. It is preferable to laminate with a terephthalate film, a polypropylene film, a polyvinylidene chloride film or a film provided with an aluminum vapor-deposited layer, and the laminated film preferably has a thickness of about 50 to 150 μm as a whole.

[0010]

Now, the present invention will be described in more detail with reference to examples. Example 1 As shown in FIG. 1, a mat coat layer 1 / easy adhesion polyethylene terephthalate film 2 (T4100, manufactured by Toyobo,
A packaging material of the present invention having a laminated structure of 12 μm in thickness) / pattern layer 3 / dry adhesive layer 4 / aluminum deposition layer 5 (7 μm) / dry adhesive layer 4 / polyethylene terephthalate film 6 (40 μm) was prepared. In the laminating step, a mat coat layer and a picture layer are printed on both sides of the easily adhesive polyethylene terephthalate film, and then a dry laminating adhesive (ester type) is applied to the picture layer at a rate of 3 g / m ² at 90 ° C.
At a laminating speed of 100 m / min. Then, a polyethylene terephthalate film provided with the aluminum vapor-deposited layer 5 via the adhesive layer 6 in advance is laminated, and 35
After curing at an aging temperature of 5 ° C. for 5 days, evaluation was performed by the following table test.

The used mat coating agent (XEL writing OP)
The composition of the varnish is as follows. XEL writing OP varnish composition : matting agent (benzoguanamine-based resin particles, average particle size 1 to 5 μm) 12 to 16 parts by weight Microsilica (average particle size 2 to 5 μm) 1 to 5 parts by weight Acrylic polyol 7 to 10 parts by weight vinyl chloride -Vinyl acetate copolymer 7 to 10 parts by weight CAB (cellulose acetate butyrate) 1 to 5 parts by weight Polyethylene wax 1 to 4 parts by weight As a solvent, use a mixed solvent of toluene / methyl ethyl ketone / ethyl acetate. 4 parts by weight of a curing agent (xylylene diisocyanate) was added to 100 parts by weight of OP varnish.

Comparative Example 1 In place of the XEL writing OP varnish in Example 1, PEX
A packaging material of a comparative example was prepared in the same manner as in Example 1 except that T-mat OP varnish (polyamide type) was used and ALFA (urethane-based general-purpose one-component ink) was used instead of the ink for the picture layer. . The physical properties of the packaging materials of the above Examples and Comparative Examples are as shown in Table 1 below.

Laminate surface contamination : After printing on the front and back sides, the paper is stored in a wound state at 30 ° C. for 7 days, and the degree of repellency of the adhesive on the surface of the picture layer is observed. After laminating the polyethylene terephthalate film / aluminum, it is stored at 30 ° C. for 7 days, and contamination of the aluminum surface is observed by checking the aluminum surface for wetting. Surface heat resistance : After processing to the final specification, aluminum 3 on the matte coated surface
Apply 0 μm and seal under a load of 2 kg at 220 ° C. for 2 seconds, and observe the transfer of the mat coat layer to the aluminum surface. Writability : Use a ball-point pen, water-based pen, and pencil to see if you can write letters and pictures on the matte coated surface.

Example 2 As shown in FIG. 2, mat coat layer 1 / adhesive polyethylene terephthalate film 2 (same as in Example 1) / picture layer 3 / anchor layer 7 / polyethylene layer 4 (15 μm) /
A packaging material of the present invention having a laminated structure of an aluminum deposition layer 5 (7 μm) / anchor layer 7 / polyethylene layer 4 (15 μm) / polyethylene terephthalate film 6 (40 μm) was prepared. In the laminating step, the matte coat layer and the pattern layer are printed on both sides of the easily adhesive polyethylene terephthalate film, and then an anchor agent (imine-based adhesive) is applied to the pattern layer surface.
Then, a polyethylene (general low-density polyethylene) is used for the aluminum surface, a urethane-based adhesive is applied to the aluminum surface in advance, and an aluminum vapor-deposited layer 5 is applied to the polyethylene terephthalate film surface via a polyethylene adhesive layer 6.
A polyethylene terephthalate film provided with was laminated in-line and evaluated by a table test in the same manner as in Example 1. When the physical properties of the packaging material of the above example were evaluated, both the surface heat resistance and the writing suitability were excellent. The used mat coating agent and picture layer ink are the same as in Example 1.

Example 3 As shown in FIG. 3, mat coat layer 1 / adhesive polyethylene terephthalate film 2 (same as in Example 1) / picture layer 3 / anchor layer 7 / polyethylene layer 4 (15 μm) /
Aluminum deposited layer 5 (7 μm) / Dry adhesive layer 4 /
Polyethylene terephthalate film 8 (12 μm) /
A packaging material of the present invention having a laminated structure of anchor layer 7 / polyethylene layer 4 (15 μm) / polyethylene terephthalate film 6 (40 μm) was prepared. In the laminating step, a mat coat layer and a pattern layer are printed on both sides of the easily adhesive polyethylene terephthalate film, and then the aluminum vapor-deposited layer / adhesive layer / polyethylene terephthalate film / anchor layer / polyethylene layer / polyethylene terephthalate film The laminate was processed in-line using an anchor agent (imine-based adhesive) on the pattern layer surface and polyethylene (general low-density polyethylene) on the aluminum surface to obtain a packaging material of the present invention. The above products,
Apply 30μm aluminum on the mat coat layer surface
Sealing was performed under the conditions of 220 ° C. for 2 seconds under a load of g, and the transfer of the mat coat layer to the aluminum surface was observed. As a result, good results were obtained in terms of surface heat resistance.

[0016]

[Effect of the Invention] In the present invention, an easy-adhesion polyethylene terephthalate film is used as a film printing base material, the pattern layer on the back side is formed using a nitrifying cotton-based ink, and the matte coating layer on the front side is formed of vinyl chloride / acetic acid. By forming with a combination of vinyl copolymer resin / acryl polyol ink, blocking between ink surfaces does not occur after printing, and the resin system of the mat coat layer is made of vinyl chloride.
By using the vinyl acetate copolymer resin / acrylic polyol system, the heat resistance during sealing was improved. Also, by forming the mat coat layer with a silica-based matting agent,
Writing suitability could be imparted to the mat coat layer. Furthermore, by using a vinyl chloride / vinyl acetate copolymer resin / acryl polyol-based ink composition for the mat coat layer, the water repellency of the conventional polyamide resin was eliminated, and more excellent writeability could be imparted. .

[0017]

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a cross section of a packaging material of the present invention.

FIG. 2 is a diagram illustrating a cross section of the packaging material of the present invention.

FIG. 3 is a diagram illustrating a cross section of the packaging material of the present invention.

[Explanation of symbols]

 1: Matt coat layer 2: Easy adhesion polyethylene terephthalate film 3: Picture layer 4: Adhesive layer / polyethylene layer 5: Aluminum layer 6: Polyethylene terephthalate film 7: Anchor layer 8: Polyethylene terephthalate film

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location C08L 27/06 LEV C08L 27/06 LEV

Claims (5)

(57) [Scope of request for utility model registration] 1. A plastic film as a surface substrate,
In a packaging material having a matte coat layer on part or all of its surface and a picture layer on part or all of its back,
The plastic film is an easy-adhesion polyethylene terephthalate film, and the mat coat layer is made of vinyl chloride.
・ Vinyl acetate copolymer resin / acrylic polyol mixed resin
Packaging material, characterized in that it consists of. 2. The picture layer is made of a nitrified cotton resin.
The packaging material described in. 3. A pattern layer and a mat coat layer are formed in a pattern, and the positions between these patterns are aligned.
Packaging material of claim 1 which are. 4. The packaging material according to claim 1, wherein the picture layer and the mat coat layer are printed on the front and back sides in-line. 5. The packaging material according to claim 1, wherein the mat coat layer has a writing property.