Method for producing laminated film for decorative sheets of packaged foods

Abstract

To provide a laminated film for decorative sheets of flat packaged foods which are not bent.SOLUTION: In a manufacturing method for laminated film for decorative sheets of packaged foods, which is manufactured by laminating another plastic film F2 with an adhesive on the printed side of a plastic film F1 printed on one side, a non-solvent laminating adhesive consisting of a base agent and a hardener is used as the adhesive, and the base agent and hardener are separately applied to the plastic film fed from the first paper feed side and the plastic film fed from the second paper feed side, respectively, and then these plastic films are bonded together and then reacted and hardened at room temperature to bond and laminate them.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for producing a laminated film used as a decorative sheet attached to packaged food products when packaging them. [Background technology]

[0002] For example, when packaging foods such as sushi, bento lunches, and side dishes in containers such as trays, it has been customary since ancient times to place plants such as bamboo grass, bamboo bark, and shiso leaves as partitions or decorations between the foods.

[0003] Regarding the above-mentioned decorations, currently, taking into consideration the cost of procuring materials and the processing costs of decoratively cut items such as roses, it is common to substitute them with plastic decorative sheets that imitate these (Patent Document 1).

[0004] The decorative sheets are manufactured by cutting out plastic film printed with patterns and colors that resemble plant decorations. However, if the printed surface is exposed and comes into contact with food, there is a risk that ink will adhere to it, causing hygiene problems. Therefore, plastic films are manufactured by laminating another plastic film with an adhesive to the printed side of a plastic film printed on one side. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Actual Publication Showa 54-008391 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0006] In the above-mentioned conventional technology, a laminated plastic film made by bonding two plastic films with an adhesive is used to obtain a decorative sheet, but because hot air at 60 to 90°C is used to dry the solvent contained in the adhesive, the finished laminated plastic film is not flat but warped.

[0007] On the other hand, plant-based decorations are flat, and in this respect, the decorative sheets of the prior art have had the problem of not being able to fully imitate plant-based decorations. [Means for solving the problem]

[0008] The present invention has been made with the object of providing a method for producing a laminated film for use as a decorative sheet for packaged food that solves the above-mentioned problems.

[0009] That is, the present invention is a method for manufacturing laminated film for decorative sheets of packaged foods, which is manufactured by laminating another plastic film with an adhesive on the printed side of a plastic film printed on one side, and is characterized in that a non-solvent laminating adhesive is used as the adhesive, and after the non-solvent laminating adhesive is applied to a plastic film fed from the first paper feed side and a plastic film fed from the second paper feed side, these plastic films are bonded together, and then the plastic films are bonded and laminated by reacting and curing at room temperature.

[0010] Furthermore, the invention described in claim 2 is a manufacturing method for laminated film for decorative sheets of packaged food, which is manufactured by laminating another plastic film with an adhesive on the printed side of a plastic film printed on one side, and is characterized in that a non-solvent laminating adhesive consisting of a base agent and a hardener is used as the adhesive, and the base agent and hardener are separately applied to each of the plastic film fed from the first paper feed side and the plastic film fed from the second paper feed side, and then these plastic films are bonded together, and then the plastic films are reacted and hardened at room temperature to bond and laminate them. [Effects of the Invention]

[0011] The method for manufacturing laminated film for decorative sheets for packaged foods of the present invention uses a non-solvent laminating adhesive that does not use solvents, so there is no need to volatilize the solvent, and there is no need to apply hot air at 60 to 90°C as in conventional technology, so there is no risk that the finished laminated film for decorative sheets will be warped rather than flat.

[0012] However, when laminating two plastic films with an adhesive, if a highly reactive non-solvent laminating adhesive is applied in advance, there is a risk that the adhesive will harden before the films are bonded together, resulting in insufficient adhesive strength.

[0013] In the invention described in claim 2, the base agent and curing agent of the non-solvent laminating adhesive are applied separately to the plastic film fed from the first paper feed side and the plastic film fed from the second paper feed side, respectively, and then these plastic films are bonded together and cured by reaction, so the above problem does not occur and highly reactive non-solvent laminating adhesives can be used without any problems. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a conceptual diagram showing the steps of a method for producing a laminated film for use as a decorative sheet for packaged food according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

[0015] Specific examples of the present invention will be described below with reference to the accompanying drawings. The laminate film for decorative sheets of packaged foods of the present invention is manufactured by laminating two or more plastic films together with an adhesive. Here, an example in which two plastic films are laminated together with an adhesive is disclosed.

[0016] In the figure, symbol F1 is the first plastic film, here a 25μ thick OPP film printed on one side, and symbol F2 is the second plastic film, here a 25μ thick OPP film.

[0017] The plastic film F1 is wound onto the first unwinding roll 1 with the printed side facing out, forming the first paper feed side, and the plastic film F2 is wound onto the second unwinding roll 2 to form the second paper feed side. These two plastic films are unwound from the unwinding rolls and are joined at a laminating section 5 consisting of a pair of opposing rolls, where the plastic film F2 is pressed against the printed side of the plastic film F1 to form a laminated film S, which is then wound onto a take-up roll 6. Before the lamination, the base agent of the non-solvent laminating adhesive is applied to the plastic film F1 by the application roll 2, and the curing agent of the non-solvent laminating adhesive is applied to the plastic film F2 by the application roll 4.

[0018] The laminated plastic film F1 and plastic film F2 are formed into a laminated film S by the reaction and hardening of the applied base agent and hardener at room temperature (20 to 25°C).

[0019] The laminated film S is cut into a desired shape to be used as a decorative sheet for packaged food.

[0020] In the above examples, a laminated film is made by laminating two 25μ thick OPP films printed on one side, but a laminated film can also be made by laminating, for example, a 20μ thick OPP film, a 16μ thick PET film printed on one side, and another 20μ thick OPP film. [Explanation of symbols]

[0021] F1 plastic film F2 plastic film 1. First unwinding roll 2 Coating roll 3 Second unwinding roll 4 Coating roll 5. Bonding section 6 Take-up roll

Claims

1. This method for manufacturing a laminated film for decorative sheets of packaged foods is produced by laminating another plastic film with an adhesive on the printed side of a plastic film printed on one side, and is characterized in that a non-solvent laminating adhesive is used as the adhesive, and after the non-solvent laminating adhesive is applied to a plastic film fed from a first paper feed side and a plastic film fed from a second paper feed side, these plastic films are bonded together, and then the plastic films are bonded and laminated by reacting and curing at room temperature.

2. 2. A method for manufacturing a laminated film for decorative sheets for packaged foods, which is manufactured by laminating another plastic film with an adhesive to the printed side of a plastic film printed on one side, characterized in that a non-solvent laminating adhesive consisting of a base agent and a hardener is used as the adhesive, and the base agent and hardener are separately applied to the plastic film fed from the first paper feed side and the plastic film fed from the second paper feed side, respectively, and then these plastic films are bonded together and then reacted and hardened at room temperature to bond and laminate them.

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