JPH10100331A - Production of laminated film for cutting off ultraviolet rays - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily look content and to cut off ultraviolet rays by applying an anchor coat soln. mixed with an ultraviolet rays cut-off agent to the single surface of a biaxially stretched plastic base material and laminating a transparent film to this coated surface by using an extrusion laminating or dry laminating apparatus. SOLUTION: A bag making film is composed of a laminated film 5 formed by laminating a transparent polyethylene layer 3 to the single surface of a layer of polyester, nylon or polypropylene becoming a biaxially stretched plastic base material and processed so as to be lowered in gas permeability by using an extrusion laminating or dry laminating apparatus. When the polyethylene layer 3 is heated and bonded at a time of bag making to be laminated, an anchor coat layer 6 is used by mixing an ultraviolet cut-off agent with an anchor coat agent. In this case, since the ultraviolet cutoff agent is transparent, the laminated film 5 is also transparent and, even at a time when a packing bag is made, content can be perfectly looked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag for enclosing perishable products such as food, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, packaging bags for enclosing meat and the like, especially living organisms and colored foods in foods, have conventionally been used to oxidize and discolor the contents.
In order to prevent deterioration in quality due to deterioration or the like, as shown in the enlarged cross section of FIG. 2, polyester, nylon, which is processed so as to reduce gas permeability so as to reduce oxygen permeability and water vapor permeability, Polypropylene, etc. (hereinafter KP
ET, KNY, KOP etc.) plastic substrate 1
And a special substrate for preventing ultraviolet rays is laminated by extrusion laminating means or dry laminating means, or a polyethylene layer 3 is laminated on the surface of a plastic substrate 1 having an aluminum vapor deposition layer 2. Had been manufactured.

In this case, an appropriate print 4 is applied to the inner surface (laminated surface side) of the plastic base material 1 before laminating the polyethylene in order to clearly indicate the contents and other necessary items as a product. By laminating No. 3, a construction method by heat bonding at the time of bag making is enabled.

[0004] In the case of using a film having an aluminum vapor deposited layer 2 as a substrate for the purpose of preventing ultraviolet rays, since the content of this substrate is difficult to see visually, as shown in FIG. The window 2a is opened so that it can be partially confirmed. As this method, a portion other than the window 2a may be subjected to paster processing for performing special printing to provide the portion of the window 2a, and the unprinted window portion may be removed using a special solvent.

As another means, aluminum is vapor-deposited on one surface of a biaxially stretched ethylene-vinyl alcohol copolymer film substrate, and a water-resistant lacquer is applied to the other surface to make the surface water-resistant. Has been manufactured by laminating a polypropylene film and laminating a polyethylene film on the water-resistant surface.

[0006]

The method for manufacturing a packaging base material having the above-described structure is based on laminating a film provided with an aluminum vapor-deposited layer 2 for the purpose of cutting off ultraviolet rays on one side of the base material or a special film. In this case, an extrusion laminating step is required, and the processing step becomes complicated.
Further, a film provided with the aluminum vapor-deposited layer 2 and a special film for the purpose of cutting off ultraviolet rays have a high price and a high manufacturing cost.

Further, in a packaging bag for enclosing a food or the like, there is a strong demand that not only oxygen permeability and water vapor permeability be reduced as much as possible, but also that the enclosed contents be sufficiently visible from the outside. Have been.

As a measure which can be visually observed without impairing the permeability of oxygen or water vapor, a method of removing the aluminum vapor-deposited layer 2 in a pattern at present is adopted. Is impossible.

However, even in such a method, there is no attempt to cut off ultraviolet rays entering from the transparent portion of the pattern.

[0010] The present invention solves the above-mentioned problems, and provides a method for producing an ultraviolet ray-preventing base material capable of easily observing the contents and preventing ultraviolet rays, and a food packaging bag using the same. The task is to

[0011]

In order to solve the above-mentioned problems, an anchor coating solution mixed with an ultraviolet ray cut agent is applied to one surface of a biaxially stretched plastic base material, and extrusion coating or dry coating is performed on the application surface. Laminated with a transparent film using a laminating apparatus or the like.

In addition, KEPT as a plastic substrate,
KNY, KOP or the like is used, and polyethylene is used as a transparent film.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an enlarged cross-sectional view of a bag-making film according to the present invention. One side (packing) of a layer of KEPT, KNY, KOP, etc., which becomes a plastic substrate 1 of a biaxially stretched packaging bag. A stabilizer for polyurethane resin as an ultraviolet-cutting agent in an alkyl titanate or polyethyleneimine adhesion promoter as an anchor coat layer 6 used when laminating a polyethylene layer 3 for heat bonding at the time of bag making on the inner side of the bag) HN-130 was mixed and used to form a laminate film 5.

In this case, since the HN-130 is a transparent body, the laminate film 5 is also transparent, so that the contents are completely visible even in a packaging bag. The necessary printing may be performed on the inner surface side (inside the packaging bag) of the plastic substrate 1 before lamination.

[0015]

As described above, since the entire surface of the laminate film formed by the above-mentioned method is transparent, even if printing is performed on the surface, the visual inspection of the contents is sufficient.

[0016] The simplest step, that is, the anchor coating agent is added to the plastic substrate, only the step of mixing the UV-cutting agent with the anchor coating agent for forming the anchor coating layer is added, and no other step is added. Can be made into a material that can be made into a bag by simply laminating polyethylene.

As a result, the cost of the laminated film can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a laminate film according to the method of the present invention.

FIG. 2 is a cross-sectional view of a conventional bag-making film.

FIG. 3 is an explanatory view of an example of a film made visible with a conventional bag-making film.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plastic base material 2 Aluminum vapor deposition layer 3 Polyethylene layer 4 Printing 5 Laminating film 6 Anchor coat layer

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[Procedure amendment]

[Submission date] October 15, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

In addition, K PET , as a plastic substrate,
KNY, KOP or the like is used, and polyethylene is used as a transparent film.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013]

Figure 1 DETAILED DESCRIPTION OF THE INVENTION in the enlarged cross sectional view of a film for bag making according to the present invention, K PE T as the plastic base 1 of the biaxially stretched packaging bag, KNY, one side of the layer, such as KOP Polyurethane resin as an ultraviolet cut agent in an alkyl titanate or polyethylene imine adhesion promoter as an anchor coat layer 6 used when laminating a polyethylene layer 3 for heat bonding at the time of bag making (on the inner side of the packaging bag) A laminate film 5 was prepared by mixing and using a stabilizer HN-130.

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

Claims (2)

[Claims] 1. An anchor coating solution mixed with an ultraviolet ray cut agent is applied to one surface of a biaxially stretched plastic substrate, and the coated surface is laminated with a transparent film using an extrusion lamination or dry lamination apparatus. A method for producing a laminated film for cutting ultraviolet light, comprising the steps of: 2. The ultraviolet ray according to claim 1, wherein the plastic substrate is made of polyester, nylon, polypropylene or the like processed to reduce gas permeability, and the transparent film is made of polyethylene. Manufacturing method of laminated film for cutting.