JP3328841B2 - Packaging material and manufacturing method thereof - 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 used for packaging, for example, cold foods, powdered soup ingredients, shavings, various solid products, and a method of manufacturing the packaging material.

[0002]

2. Description of the Related Art A packaging material in which a supporting substrate made of a plurality of stretched plastic films is laminated, and a resin layer for a heat sealant is formed on one side of the packaging material, the surface of the resin layer for a heat sealant in the packaging material is a package. It is used so as to be an inner peripheral layer.

[0003] A packaging material having such a laminated structure is prepared by laminating support substrates made of a stretched plastic film formed in advance by a dry lamination method, or by using, for example, a support material composed of a polyolefin resin layer / a stretched plastic film. Substrate / Polyolefin resin layer "
After obtaining a multilayer film having the same structure as above, the multilayer film is used as an intermediate layer, and a first supporting substrate made of a stretched plastic film located on the surface side and a multilayer film are interposed between the two. It is manufactured by means such as laminating a polyolefin-based resin layer by extrusion molding.

[0004]

In the above-mentioned conventional packaging material, the former packaging material obtained by laminating the respective supporting base materials made of a preformed stretched plastic film by a dry lamination method includes a dry laminating method. The packaging material obtained by the method has a “lumbar rigidity” that is common, and the scratch resistance, cold shock resistance, twisting resistance, pinhole resistance, etc. are not sufficient. Hard to use for applications. In addition, the production process requires an aging step of curing the adhesive, so that it cannot respond to a prompt delivery date and has the disadvantage that the production cost is increased.

[0005] In the case of the packaging material using the latter multilayer film as an intermediate layer, the material cost of the multilayer film used for the intermediate layer is extremely high, and the support material comprising the polyolefin resin layer and the stretched plastic film in the multilayer film is used. The interlayer strength between the base material is weak, for example, when the packaging bag formed of the packaging material is opened from the notch portion formed in the packaging bag, peels off at the interface, and a smooth opening operation Cannot be performed, resulting in a so-called double bag state.

[0006] On the other hand, the present invention solves all of the above-mentioned disadvantages of the conventional packaging material, and has no rigidity in the packaging material, and also has scratch resistance, cold shock resistance, and twisting resistance. , The pinhole resistance is sufficient, and the aging process of hardening the adhesive during the manufacturing process is not required, so that it is possible to respond quickly to the delivery date, and
It is intended to provide a packaging material which is inexpensive in production cost and further has properties such as high interlayer strength between layers, and a method for producing the packaging material.

[0007]

The above object can be attained by the packaging material of the present invention having the following configuration and a method of manufacturing the same. That is, the packaging material of the present invention
A first support base made of a biaxially stretched plastic film located on the front side, a heat sealant resin layer located on the back side, and between the first support base and the heat sealant resin layer And a second supporting base made of a biaxially stretched plastic film located thereover.

In the packaging material of the present invention having the above-mentioned laminated structure, the back surface of the first support substrate is treated with an anchor coat agent, and the front surface of the second support substrate is subjected to a simultaneous process. The printed cosmetic processing and the treatment with the anchor coating agent are further provided, and the back surface of the second support base material is further subjected to the treatment with the anchor coating agent.
The back surface of the support base material and the surface of the second support base material are bonded via a polyolefin-based resin layer extruded between the two, and the resin layer for a heat sealant described above. Are extrusion-formed on the back surface of the second support base material.

The packaging material according to the first aspect of the present invention having such a laminated structure is generally used for a type of packaging body in which a sealed portion can be formed by the heat-sealing ability of the resin layer for a heat sealant in the packaging material. Then, it is formed into a sealed bag or the like so that the resin layer for heat sealant becomes the inner peripheral surface layer of the package.

[0010] In the method for producing a packaging material of the present invention, the second supporting base material is obtained by simultaneously performing the printing cosmetic processing and the treatment with the anchor coating agent on the surface of the biaxially stretched plastic film. After that, the first backing substrate is obtained by performing a treatment with an anchor coat agent on the back surface of another biaxially stretched plastic film,
By extruding a polyolefin-based resin layer between the back surface of the supporting base material and the surface of the second supporting base material,
Laminating a first support substrate and a second support substrate,
A step of subjecting the back surface of the second support base material to a treatment with an anchor coat agent, and then extruding a resin layer for a heat sealant on the treated surface of the anchor coat agent, thereby forming a biaxial stretch positioned on the front surface side. A first support base made of a plastic film, a heat sealant resin layer located on the back side, and a biaxially stretched plastic film located between the first support base and the heat sealant resin layer. A second supporting base material, and the first
And a method of obtaining a packaging material of a laminated material obtained by laminating a back surface of the supporting base material and a front surface of the second supporting base material via a polyolefin resin layer extruded therebetween.

In the packaging material of the present invention having the above-described structure and the method of manufacturing the packaging material, the first supporting base made of a biaxially stretched plastic film located on the front side may be, for example, polypropylene, thermoplastic polyester, nylon, or the like. And a biaxially stretched plastic film of polyvinyl chloride or the like, or a composite film in which a coating layer of a barrier resin such as polyvinylidene chloride is formed on the biaxially stretched plastic film.

The second supporting base material may be a biaxially stretched plastic film made of, for example, polypropylene, thermoplastic polyester, nylon, saponified ethylene-vinyl acetate copolymer, or a biaxially stretched plastic film. For example, a composite film formed with a coating layer of a barrier resin such as polyvinylidene chloride is used.

The polyolefin resin layer interposed between the back surface of the first support substrate and the front surface of the second support substrate is usually formed by extrusion of low-density polyethylene to a thickness of about 10 to 50 μm. It consists of a resin layer.

The resin layer for the heat sealant located on the back side includes, for example, low density polyethylene, medium density polyethylene, linear low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer, ethylene-acrylic acid copolymer For example, it is extruded to a thickness of about 10 to 60 μm. The heat sealant resin layer may be formed of a resin containing an antistatic agent, or may be subjected to an antistatic treatment, if necessary.

The treatment with the anchor coat agent on the back surface of the first support substrate, the front surface of the second support substrate, and the back surface of the second support substrate may be performed, for example, using organic titanium, polyethyleneimine, urethane resin, salt, or the like. -It is performed with vinyl acetate resin, polyester resin, diene compound and the like.

The treatment of the surface of the second support substrate with the anchor coat agent is performed simultaneously with the printing cosmetic processing step. Further, the treatment with the anchor coating agent on the back surface of the first support substrate is performed by extrusion molding of a polyolefin resin layer interposed between the back surface of the first support substrate and the surface of the second support substrate. In the step, it is preferable that the step is performed prior to the extrusion molding of the polyolefin-based resin layer, and the treatment of the back surface of the second support substrate with the anchor coating agent is performed on the back surface of the second support substrate. During the extrusion step of the heat sealant resin layer to be performed, it is preferable that the heat sealant resin layer be extruded before the extrusion step.

[0017]

In the packaging material according to the present invention, the support bases made of a biaxially stretched plastic film are laminated via an extruded resin layer of a polyolefin resin, that is, laminated by extrusion lamination of the polyolefin resin. Because of this, the packaging material does not have rigidity, and has excellent effects such as scratch resistance, cold shock resistance, twisting resistance, and pinhole resistance. In addition, a support base made of a biaxially stretched plastic film Since the adhesive surface of each has been treated with an anchor coat agent, the adhesive strength between the layers of the laminated resin layer is high. Furthermore, since an existing expensive multi-layer film having a structure such as “polyolefin resin layer / support base material composed of stretched plastic film / polyolefin resin layer” is not used, it can be supplied at a low cost.

The packaging material according to the first aspect of the present invention does not require an aging step of curing the adhesive during the manufacturing process of the packaging material due to its configuration, so that it can respond to a quick delivery date.

Further, the method for producing a packaging material according to the present invention comprises the following steps:
Since the treatment of the surface of the biaxially stretched plastic film serving as the supporting base material with the anchor coating agent is performed by the same process as the printing cosmetic processing on the surface, the surface of the extrusion laminate surface is treated with the anchor coating agent. No additional process is required. For this reason, according to the manufacturing method of the packaging material of the present invention, the high quality packaging material of the present invention can be manufactured by a simple process, and the packaging material of the present invention can be supplied at low cost.

[0020]

EXAMPLES The specific structure of the packaging material of the present invention will be described with reference to production examples.

"Example 1" A printing cosmetic processing and a urethane anchor coating agent "Sumitomo Bayer Urethane Co., Ltd." were applied to one side of a biaxially stretched nylon film (A) having a thickness of 15 .mu. : Coronate L ”was sequentially performed in-line using a surface gravure plate to prepare a second support substrate.

Next, a first support base material having a thickness of 15 μm
Is treated with a urethane anchor coating agent "Sumitomo Bayer Urethane Co., Ltd .: Coronate L" on the corona discharge-treated surface of the biaxially stretched nylon film (B) having one surface subjected to corona discharge treatment. The surface of the biaxially stretched nylon film (B) treated with the urethane-based anchor coating agent and the treatment of the biaxially stretched nylon film (A) with the urethane-based anchor coating agent were combined with a 20 μm-thick low-density polyethylene resin “Mitsui Petrochemical Industry Co., Ltd .: M11P,
MI = 7.2; d = 0.917) ”and laminated using a“ first support base (B) / extruded layer of polyolefin resin / second support base ( A) "to give a laminated sheet (C).

Thereafter, the biaxially stretched nylon film (A) surface of the laminated sheet (C) is treated with a urethane anchor coating agent “Sumitomo Bayer Urethane Co., Ltd .: Coronate L”. On the treated surface of the urethane-based anchor coating agent, a low-density polyethylene resin having a thickness of 30 μm (Mitsui Petrochemical Co., Ltd .: M11P, MI = 7.
2; d = 0.917) "to form a resin layer for a heat sealant comprising a resin layer extruded from a melt, thereby obtaining a packaging material as an example of the present invention.

"Comparative Example 1" Printing cosmetic processing and a urethane anchor coating agent "Sumitomo Bayer Urethane Co., Ltd .: Coronate" were applied to the corona discharge treated surface of a biaxially stretched nylon film having a thickness of 15 .mu. L), the printed decorative surface of the biaxially stretched nylon film and a commercially available 25 μm thick “linear low density polyethylene resin layer / biaxially stretched nylon film / linear low density polyethylene resin” And a multilayer film of "layers" was laminated by interposing a resin layer of a low-density polyethylene resin having a thickness of 20 .mu.m between both of them to obtain a laminated sheet.

Subsequently, a resin layer for a heat sealant composed of a melt-extruded resin layer of a low-density polyethylene resin having a thickness of 30 μm was formed on the multilayer film surface of the laminated sheet to obtain a packaging material for comparison.

"Experiment 1" Using the packaging material obtained in Example 1 and the packaging material obtained in Comparative Example 1, a four-side bag making machine was used to seal at a temperature of 180 ° C. and 100 shots / min.
Then, after heat-sealing the four edges, I
By forming the notch, two types of sealed bags were obtained.

When the opening strength of each sealed bag when opened from the I-notch was measured, the opening strength of the sealed bag with the packaging material of Example 1 was 2400 g / 15 mm width, whereas that of Comparative Example 1 was not. The opening strength of the sealed bag with the packaging material is 40
It was 0 g / 15 mm width.

Although the heat-sealed portion of the sealed bag with the packaging material of Example 1 was excellent in opening property, the opening of the sealed bag with the packaging material of Comparative Example 1 was accompanied by the “line” in the packaging material. Between the linear low-density polyethylene resin layer and the biaxially stretched nylon film layer in the multilayer film composed of "linear low-density polyethylene resin layer / biaxially stretched nylon film layer / linear low-density polyethylene resin layer", It was in a so-called double bag state and could not be opened smoothly.

[Comparative Example 2] A biaxially stretched nylon film (D) having a thickness of 15 µm and having one surface subjected to corona discharge treatment,
A biaxially stretched nylon film (E) having a thickness of 15 μm, both surfaces of which are subjected to corona discharge treatment, and a low-density polyethylene film (F) having a thickness of 30 μm, respectively, were coated with a urethane-based adhesive “Takeda Pharmaceutical Co., Ltd.” A515 / A12 "and laminated by a dry lamination method, and a" biaxially stretched nylon film (D) / a biaxially stretched nylon film (E) "
/ Low-density polyethylene film (F) "for comparison.

[Experiment 2] The piercing strength of the packaging material obtained in Example 1 and the packaging material obtained in Comparative Example 2 was measured by a 0.5R needle method.
g of the packaging material of Comparative Example 2 was 1800 g.

[0031]

The packaging material according to the first aspect of the present invention has a laminated structure in which a biaxially stretched plastic film is used for both the first support base material and the second support base material. There is no rigidity in the waist, and it has excellent scratch resistance, cold shock resistance, twist resistance, pinhole resistance, etc., and also has high adhesive strength between layers.
It is suitable as a wrapping material for packaging cut-off nodes, solid products, and the like, and has excellent practical effects.

Further, according to the method for manufacturing a packaging material of the second invention, a packaging material having the characteristics of the first invention can be obtained accurately and at low cost.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-90344 (JP, A) JP-A-57-182435 (JP, A) JP-A-64-26442 (JP, A) JP-A-4- 18343 (JP, A) JP-A-5-212838 (JP, A) JP-A-60-106719 (JP, U) JP-A-60-179432 (JP, U) (58) Fields investigated (Int. ⁷ , DB name) B32B 1/00-35/00

Claims (2)

(57) [Claims] 1. A first support base made of a biaxially stretched nylon film located on the front side, and a heat sink located on the back side.
A packaging material having a laminated structure comprising a resin layer for toweling and a second supporting substrate made of a biaxially stretched nylon film located between the first supporting substrate and the resin layer for sealing. In addition, the back surface of the first support base material is treated with an anchor coating agent, and the front surface of the second support base material is subjected to a printing cosmetic process performed in a simultaneous step. A treatment with an anchor coat agent, and a treatment with an anchor coat material on the back surface of the second supporting base material,
In addition, the back surface of the first support substrate and the front surface of the second support substrate are adhered to each other via a polyolefin resin layer extruded therebetween, and
A packaging material, characterized in that the heat sealant resin layer is formed by extrusion on the back surface of the supporting base material. 2. A second support substrate is obtained by simultaneously performing a printing process and a treatment with an anchor coat agent on the surface of a biaxially stretched nylon film to obtain a second support substrate.
A first support substrate is obtained by performing a treatment with an anchor coating agent on the back surface of the axially stretched nylon film, and the back surface of the first support substrate and the front surface of the second support substrate are obtained. Extruding and molding a polyolefin resin layer between the first and second support bases, and an anchor core on the back surface of the second support base.
Extruding a heat sealant resin layer on the treated surface of the anchor coat agent after the treatment with the coating agent, thereby forming a second biaxially stretched nylon film located on the surface side. 1 support base material, a heat-sealing resin layer located on the back side, and a biaxially stretched nylon positioned between the first supporting base material and the heat-sealing resin layer. a second support substrate made of a film, and
A laminated material is obtained by laminating the back surface of the first support base and the surface of the second support base via a polyolefin-based resin layer extruded between the two. Manufacturing method of packaging material.