Manufacturing method for food packaging paper trays that are easy to separate and dispose of

Abstract

The present invention relates to a "method of manufacturing a paper tray for packaging food that is easy to separate and dispose of", and its purpose is to make a frame for a food packaging tray using paper and coat (attach) a synthetic resin stretched film on the inner surface of the tray, thereby ensuring waterproofing and enabling sealed packaging through a sealing packaging machine using a thermoplastic film. According to the present invention, a paper tray is manufactured with a predetermined thickness, and the bottom, wall and outer flange of the paper tray are coated (attached) with a synthetic resin stretched film, so that not only is the outer shape firmly maintained, but also the outer flange to which the synthetic resin stretched film is attached can be sealed and packaged through a sealing packaging machine using a thermoplastic film. In particular, the synthetic resin stretched film is stretched and adheres to the bottom, wall and outer flange of the paper tray through an adhesive applied to the underside, ensuring waterproofing of the paper tray, and can be easily separated from the paper tray by pulling it with artificial force.

Description

[Technical Field]

[0001] This invention relates to a method for manufacturing paper trays for food packaging that are easy to separate and dispose of. More specifically, it relates to a "method for manufacturing paper trays for food packaging that are easy to separate and dispose of" in which the tray frame (main body) is made from environmentally friendly paper and the inner surface is coated (attached) with an adhesive synthetic resin stretched film, enabling sealed packaging while ensuring waterproofing. [Background technology]

[0002] Generally, most food delivered or sold in stores is packaged to protect it from physical and chemical damage, spoilage, or contamination that may occur during transportation and storage. Disposable packaging containers made of synthetic resin are used for this purpose. The food is placed in a disposable container, and a thermoplastic film (also known as a sealing film) is heat-sealed around the edge of the opening to seal the container. Disposable packaging containers made of synthetic resin are used because they can safely package moist and fragile foods and can be sealed with a thermoplastic film. However, disposable synthetic resin packaging containers are difficult to recycle unless they are properly collected, and most are simply discarded, resulting in serious environmental pollution. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention is intended to solve these problems, and its purpose is to provide a "method for manufacturing food packaging paper trays that are easy to separate and dispose of" by making the frame (main body) of the food packaging tray using environmentally friendly paper and coating (attaching) the inner surface with a synthetic resin stretched film treated with an adhesive, thereby ensuring waterproofing and allowing the tray to be sealed and packaged using a sealing packaging machine that uses thermoplastic film.

[0004] Another object of the present invention is to provide a "method for manufacturing food packaging paper trays that are easy to separate and dispose of" that can increase resource recycling by attaching an easily separable stretched film to the inner surface of the paper tray, thereby enabling the tray made of environmentally friendly paper material and the stretched film made of synthetic resin material to be separated and disposed of, thereby further reducing environmental pollution problems.

[0005] Another object of the present invention is to provide a "method for manufacturing food packaging paper trays that are easy to separate and dispose of" that can more easily attach adhesive-treated synthetic resin stretched film and improve productivity. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the "manufacturing method of food packaging paper trays that are easy to separate and dispose of" according to the present invention is as follows: A method for manufacturing a paper tray for packaging food that can be sealed and packaged in a sealing packaging machine that uses a thermoplastic film and that is easy to separate and dispose of, comprising: a blanking step of peeling off a paper tray in the shape of a development from a base paper of a predetermined thickness to have a square bottom serving as the bottom, four wall surfaces that are foldable along partial cut-and-fold lines from each side of the bottom and serve as walls, and outward flanges that are foldable outward along half-blade lines from the tops of the wall surfaces and serve as adhesive portions for the thermoplastic film; a paper tray forming step of placing the paper tray in the shape of the development created in the blanking step on a base mold that has a bottom and wall surfaces that are the same as the outline of the paper tray and is provided with a tray receiving portion that is open at the top, and pressing the bottom from above down to fold the four wall surfaces upward from each side of the bottom and stand them up, while folding and pressing the outward flanges horizontally outward from the tops of the wall surfaces to form the main body shape of the paper tray; and a paper tray forming step of forming a paper tray body shape from a synthetic resin stretched film that has an adhesive-treated underside. a stretch film attaching step of placing a film fabric to cover the top of the paper tray accommodated in the tray receiving portion of the base mold, and then pressing the synthetic resin stretched film fabric onto the upper surface of the outward flange of the paper tray through a film attaching mold and cutting the synthetic resin stretched film fabric along the edge of the outward flange; a stretch film coating step of, after the stretch film attaching step, pressing the outward flange onto the upper surface of the base mold through the film attaching mold and fixing it thereon, pushing a central portion of the synthetic resin stretched film covering the opening of the paper tray downward through a film coating plug mold manufactured to the same shape as the internal shape of the paper tray, thereby stretching the synthetic resin stretched film and attaching it to the bottom and wall surfaces of the paper tray for coating; and a removal step of, after the stretch film coating step, removing the paper tray coated with the synthetic resin stretched film from the base mold and stacking it.

[0007] In addition, the "method for manufacturing a food packaging paper tray that is easy to separate and dispose of" according to the present invention is characterized in that in the stretch film attaching step and the stretch film coating step, the film attachment mold and the film coating plug mold are preheated to 100 to 140°C to apply heat to the synthetic resin stretch film.

[0008] In addition, the "method for manufacturing a paper tray for food packaging that is easy to separate and dispose of" according to the present invention is characterized in that in the stretch film coating step, the air inside the paper tray and the base mold is forcibly discharged using a vacuum pump so that the synthetic resin stretch film can easily adhere to the bottom and wall surfaces of the paper tray.

[0009] Furthermore, the "method for manufacturing a paper tray for food packaging that is easy to separate and dispose of" according to the present invention is characterized in that in the stretched film coating step, air pressure is applied from above to below the synthetic resin stretched film, so that the synthetic resin stretched film stretches and easily adheres to the bottom and wall surfaces of the paper tray.

[0010] Furthermore, the "method for manufacturing food packaging paper trays that are easy to separate and dispose of" according to the present invention is characterized in that in the stretched film attachment step, the synthetic resin stretched film fabric is preheated to 140 to 180°C using a heater. [Effects of the Invention]

[0011] According to the "method for manufacturing a paper tray for food packaging that is easy to separate and dispose of" of the present invention, the tray is manufactured using paper of a predetermined thickness, and the bottom, walls, and outward flange of the paper tray are coated (attached) with a synthetic resin stretched film, which not only maintains its rigid outer shape but also allows the tray to be sealed and packaged in a sealing packaging machine that uses thermoplastic film via the outward flange to which the synthetic resin stretched film is attached. In particular, the synthetic resin stretched film adheres to the bottom, walls, and outward flange of the paper tray via an adhesive applied to its underside, ensuring the paper tray's waterproofing, but can also be easily separated from the paper tray by applying force. Therefore, when disposing of the paper tray for food packaging after use, the coated synthetic resin stretched film is peeled off and the environmentally friendly paper tray and synthetic resin stretched film are separated and disposed of, thereby increasing resource recycling and further reducing environmental pollution.

[0012] Furthermore, according to the "method for manufacturing a paper tray for food packaging that is easy to separate and dispose of" of the present invention, in the stretch film attaching step and the stretch film coating step, the film attachment mold and the film coating plug mold are preheated to 100 to 140°C, and heat is applied to the synthetic resin stretch film, which has the advantage that the synthetic resin stretch film stretches more smoothly and is evenly attached and coated on the bottom surface, wall surface, and outward flange of the paper tray.

[0013] In addition, according to the "method for manufacturing food packaging paper trays that are easy to separate and dispose of" of the present invention, the air inside the paper tray and base mold is forcibly expelled using a vacuum pump during the stretch film coating step, which has the effect of allowing the synthetic resin stretch film to easily adhere to the bottom and wall surfaces of the paper tray without air bubbles.

[0014] In addition, the "method for manufacturing food packaging paper trays that are easy to separate and dispose of" according to the present invention has the advantage that by applying air pressure from above to below the synthetic resin stretched film during the stretched film coating stage, the synthetic resin stretched film stretches and easily adheres to the bottom and walls of the paper tray.

[0015] In addition, according to the "method for manufacturing food packaging paper trays that are easy to separate and dispose of" of the present invention, the synthetic resin stretched film treated with an adhesive is preheated to 140 to 180°C using a heater, and then the stretched film attachment step and the stretched film coating step are carried out sequentially. This allows the synthetic resin stretched film to stretch smoothly and effortlessly, thereby shortening the process time for the stretched film coating step, thereby increasing productivity and enabling mass production. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view showing a food packaging paper tray according to the present invention, which is easy to separate and dispose of. [Figure 2] 2 is a cross-sectional view taken along line II-II in FIG. 1, showing the cross-sectional structure of the paper tray for packaging food according to the present invention. [Figure 3] 1 is a development view of a food packaging paper tray according to the present invention. [Figure 4] 1 is a block diagram showing the steps of a method for manufacturing a paper tray for packaging food according to the present invention. [Figure 5] 3A to 3C are diagrams schematically illustrating a paper tray forming step in a method for manufacturing a paper tray according to the present invention. [Figure 6] 3 is a diagram illustrating a stretched film attachment step in the paper tray manufacturing method according to the present invention. FIG. [Figure 7] FIG. 2 is a diagram schematically illustrating a preheating step for a stretched synthetic resin film used in the present invention. [Figure 8] 2 is a diagram illustrating a stretch film coating step in the paper tray manufacturing method according to the present invention. FIG. [Figure 9] 3A to 3C are diagrams illustrating the removal step in the method for manufacturing a paper tray according to the present invention; [Figure 10] 10 is a diagram showing a state in which a part of the stretched film is peeled off when the paper tray according to the present invention is disposed of after use. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0018] <Configuration of the food packaging paper tray according to the present invention>

[0019] 1 and 2, the food packaging paper tray (100) according to the present invention is used to seal and package various foods such as side dishes, meals, and home delivery meals using a sealing packaging machine that uses a thermoplastic sealing sheet (sealing film), and is made of paper, has a bottom, four walls (120), and an outward flange (130), and is open at the top. The inner surface of the paper tray (100) is coated (attached) with a synthetic resin stretch film (200) to ensure waterproofing and maintain the shape of the paper tray (100).

[0020] To reiterate, the paper food packaging tray (100) according to the present invention comprises a square bottom surface (110) that functions as the bottom surface, four wall surfaces (120) that are foldable upward at partial cut-fold lines (111) from each side of the bottom surface (110), and outward flanges (130) that are foldable outward at the top of the four wall surfaces (120) at half-blade lines (121) and function as adhesive portions for the thermoplastic film. Such a paper tray (100) is cut out in the form of a development from a paper sheet by Thomson processing so as to have the bottom surface (110), four wall surfaces (120), and outward flanges (130), as shown in Figure 3. The four walls (120) may be partially cut off from the four sides of the bottom surface (110) through the partial cut-fold lines (111), but some of them are connected so that they can be easily folded up and upright without being separated from the bottom surface (110).

[0021] In addition, the bottom surface 110, the inner surface of the wall surface 120, and the upper surface of the outward flange 130 of the paper tray 100 are coated with a synthetic resin stretch film 200, which not only provides waterproofing but also maintains the shape of the paper tray 100, and allows food to be placed in the paper tray 100 and then sealed using a sealing packaging machine that uses a thermoplastic film (also known as a sealing film).The food packaging paper tray 100 of the present invention is made by peeling off the paper tray 100 in a development shape from hygienic and environmentally friendly single-layer pulp base paper and continuously feeding it to a paper tray forming and coating device so that the paper tray 100 can be made.

[0022] <Description of the manufacturing method of the food packaging paper tray according to the present invention>

[0023] Next, a method for manufacturing the paper tray for packaging food according to the present invention constructed as above will be described with reference to the accompanying drawings.

[0024] As shown in FIG. 4, the method for manufacturing a paper tray for food packaging according to the present invention includes a blanking step (S10) in which a paper tray (100) is peeled off from a base paper in the shape of a development so that it can be folded and made; a paper tray forming step (S20) in which the paper tray (100) in the development shape made in the blanking step (S10) is placed on a base mold (400) and pressed to form a main body shape; and a paper tray forming step (S20) in which a synthetic resin stretch film (2) is applied along an outward flange (130) to cover the top of the paper tray (100) accommodated in the base mold (400). The process includes a stretch film attaching step (S30) in which the paper tray (100) is attached and then cut, a stretch film coating step (S40) in which the center of the synthetic resin stretch film (200) covering the opening of the paper tray (100) is pressed after the stretch film attaching step (S30) to attach and coat the bottom surface (110) and wall surface (120) of the paper tray (100), and a removal step (S50) in which the paper tray (100) coated with the synthetic resin stretch film (200) is removed from the base mold (400) and stacked.

[0025] The blanking step (S10), as shown in Figure 3, is a process of peeling the base paper into an unfolded shape so that the paper tray (100) can be completed by folding it. The base paper can be single-ply pulp paper or corrugated cardboard. The base paper is peeled into a shape that can be folded from the base paper using a wooden mold (also known as the 'Thomson process'). In this embodiment of the present invention, the paper tray (100) has a square bottom surface (110) that functions as the base, four side surfaces (120) that function as walls and are provided on each side of the bottom surface (110) so that they can be folded upward at a partial cut-fold line (111), and outward flanges (130) that are provided on the tops of the four side surfaces (120) so that they can be folded outward at a half-blade line (121) and function as adhesive portions for the thermoplastic film.

[0026] The paper tray forming step (S20) is a process of placing the paper tray (100) in the shape of the development made in the blanking step (S10) on a base mold (400) having a bottom and walls that are the same as the outer shape of the paper tray (100) and an open-topped tray receiving section (410), as shown in Figure 5, and pressing the bottom (110) from top to bottom, folding the four walls (120) upward from each side of the bottom (110) and standing them up, while folding and pressing the outward flanges (130) horizontally outward from the top of the walls (120) to form the main body shape of the paper tray (100). In the paper tray forming step (S20), the paper tray (100) in the shape of an unfolded view is placed in the tray receiving section (410), and the four wall surfaces (120) are folded upward and outward along the partial cutting and folding lines (111) and erected, and the outward flanges (130) are unfolded by folding horizontally outward from the tops of the four wall surfaces (120) via the half-blade lines (121).

[0027] As shown in Fig. 6, the stretched film attaching step (S30) is a process of placing a synthetic resin stretched film (200) fabric with an adhesive (300) on its underside so as to cover the top of a paper tray (100) accommodated in the tray receiving portion (410) of the base mold (400), and then pressing the synthetic resin stretched film (200) fabric onto the top of the outward flange (130) of the paper tray (100) through the film attaching mold (500) and cutting the synthetic resin stretched film (200) fabric along the edge of the outward flange (130). As shown in Fig. 7, it is preferable that the rolled synthetic resin stretched film (200) fabric is unwound and preheated to 140-180°C through a heater (210) before being supplied to the stretched film attaching step (S30). This is to ensure that the synthetic resin stretched film 200 can be smoothly stretched and attached in the stretched film coating step S40, which is performed after the stretched film attaching step S30. In the stretched film attaching step S30, the film attaching mold 500 is preheated to 100-140°C (set to 120°C in this embodiment) by a heater (not shown), and presses the synthetic resin stretched film 200 against the outward flange 130 while applying heat. Therefore, the synthetic resin stretched film 200 can be easily attached to the outward flange 130 of the paper tray 100 via the adhesive 300 applied to its underside.

[0028] 8, the stretch film coating step (S40) is a process in which, after the stretch film attaching step (S30), the outward flange (130) is pressed and fixed to the top surface of the base mold (400) through the film attaching mold (500), and the center portion of the synthetic resin stretch film (200) covering the opening of the paper tray (100) is pressed downward through the film coating plug mold (600) manufactured to the same shape as the interior of the paper tray (100), stretching the synthetic resin stretch film (200) and attaching it to the bottom surface (110) and wall surface (120) of the paper tray (100) for coating. During the stretch film coating step (S40), the synthetic resin stretch film (200) is preheated and therefore stretches smoothly, thereby shortening the coating process time and increasing work productivity. Also, in the stretched film coating step (S40), the film coating plug mold (600) is preheated to 100-140°C (set to 120°C in the present embodiment) by a heater (not shown), and heats the preheated synthetic resin stretched film (200) to gently stretch it and press it against the bottom surface (110) and wall surface (120) of the paper tray (100). As a result, the synthetic resin stretched film (200) can be easily attached to the bottom surface (110) and wall surface (120) of the paper tray (100) via the adhesive (300) applied to the underside. In this stretch film coating step (S40), the air inside the paper tray (100) and the base mold (400) is forcibly discharged by the vacuum pump (700), so that the synthetic resin stretch film (200) can be stretched and firmly attached to the bottom surface (110) and wall surface (120) of the paper tray (100) without any air bubbles. Also, in the stretch film coating step (S40), the air compressor (800) is operated to apply air pressure from the top to the bottom of the synthetic resin stretch film (200), so that the synthetic resin stretch film (200) can be stretched and easily attached to the bottom surface (110) and wall surface (120) of the paper tray (100).

[0029] As shown in FIG. 9, the removal step (S50) is a process of automatically removing and stacking the paper tray (100) coated with the synthetic resin stretch film (200) from the base mold (400) using a pickup means (not shown) after the stretch film coating step (S40).

[0030] The paper tray (100) manufactured in the form of a development in the blanking step (S10) is fed to the base mold (400), and the paper tray for packaging food (100) according to the present invention is manufactured through the steps of the paper tray forming step (S20), the stretch film attaching step (S30), the stretch film coating step (S40), and the removal step (S50). The paper tray for packaging food (100) manufactured by the manufacturing method according to the present invention has a bottom surface (110), four inclined walls (120), and an outward flange (130), and the synthetic resin stretch film (200) is coated on the bottom surface (110), the inclined walls (120), and the upper surfaces of the outward flange (130) via the adhesive (300), thereby maintaining the folded outer shape.

[0031] In particular, the food packaging paper tray (100) of the present invention is made by forming the food packaging tray frame using environmentally friendly paper, and coating the inner surface (top surface) with an adhesive synthetic resin stretched film (200), which ensures waterproofing and allows for sealing and packaging using a sealing packaging machine that uses thermoplastic film.

[0032] Furthermore, when the paper tray for packaging food according to the present invention is to be disposed of, the stretched synthetic resin film (200) attached to the inner surface (top surface) of the paper tray (100) can be peeled off and then separated and disposed of, as shown in Figure 10. That is, the stretched synthetic resin film (200) is attached to the bottom surface (110), wall surface (120) and outward flange (130) of the paper tray (100) via the adhesive (300), but can be easily peeled off by applying artificial force. Therefore, after the stretched synthetic resin film (200) is separated, the paper tray for packaging food (100) can be disposed of for recycling purposes, which increases resource recycling and further reduces environmental pollution. [Industrial Applicability]

[0033] This invention can be widely used in the field of "method for manufacturing food packaging paper trays that are easy to separate and dispose of," in which a tray frame (main body) is made from environmentally friendly paper and an adhesive synthetic resin stretched film is coated (attached) to the inner surface, ensuring waterproofing while allowing for sealed packaging. [Explanation of symbols]

[0034] 100: Paper tray 110: Bottom 111: Partial cut - fold line 120: Wall 121: Half-blade wire 130: Outward flange 200: Stretched film 210: Heater 300: Adhesive 400: Base mold 410: Tray receiving part 500: Film-attached mold 600: Film coating - plug mold 700: Vacuum pump 800:Air compressor S10: Blanking stage S20: Paper tray forming stage S30: Stretched film attachment step S40: Stretch film coating stage S50: Removal stage

Claims

1. A method for manufacturing a paper food packaging tray that can be used to seal and package food through a sealing and packaging machine that uses a thermoplastic film and that can be easily separated and disposed of; a blanking step (S10) of punching out a paper tray (100) in the shape of a development drawing from a base paper of a predetermined thickness to have a square bottom surface (110) that functions as a bottom part, four wall surfaces (120) that are foldable from each side of the bottom surface (110) through partial cut-fold lines (111) and function as walls, and outward flanges (130) that are foldable from the top of the wall surfaces (120) through half-blade lines (121) and function as adhesive parts for the thermoplastic film; A paper tray forming step (S20) in which the paper tray (100) in the shape of the development made in the blanking step (S10) is placed on a base mold (400) having a bottom and walls that are the same as the outer shape of the paper tray (100) and a tray receiving portion (410) with an open top, and the bottom (110) is pressed from top to bottom, and the four walls (120) are folded upward from each side of the bottom (110) and made to stand, while the outward flanges (130) are folded horizontally from the top of the walls (120) outward and pressed, thereby forming the main body shape of the paper tray (100); a stretched film attaching step (S30) of placing a synthetic resin stretched film (200) fabric with an adhesive (300) on its lower surface to cover the top of the paper tray (100) accommodated in the tray receiving portion (410) of the base mold (400), and then pressing the synthetic resin stretched film (200) fabric against the upper surface of the outward flange (130) of the paper tray (100) through a film attaching mold (500) while cutting the synthetic resin stretched film (200) fabric along the edge of the outward flange (130); After the stretched film attaching step (S30), a stretched film coating step (S40) is performed in which, while the outward flange (130) is pressed and fixed to the upper surface of the base mold (400) through the film attaching mold (500), the center portion of the synthetic resin stretched film (200) covering the opening of the paper tray (100) is pressed downward through a film coating-plug mold (600) manufactured to the same internal shape as the paper tray (100), stretching the synthetic resin stretched film (200) and attaching it to the bottom surface (110) and wall surface (120) of the paper tray (100) for coating; The method for manufacturing a paper tray for packaging food that is easy to separate and dispose of includes, after the stretch film coating step (S40), a removal step (S50) of removing the paper tray (100) coated with the synthetic resin stretch film (200) from the base mold (400) and stacking the paper tray.

2. 2. The method for manufacturing an easily disposable food packaging paper tray according to claim 1, wherein in the stretch film attaching step (S30) and the stretch film coating step (S40), the film attaching mold (500) and the film coating plug mold (600) are preheated to 100 to 140°C to apply heat to the synthetic resin stretch film (200).

3. 2. The method for manufacturing a paper tray for packaging food that is easy to separate and dispose of as set forth in claim 1, wherein in the stretch film coating step (S40), the air inside the paper tray (100) and the base mold (400) is forcibly discharged using a vacuum pump (700) so that the synthetic resin stretch film (200) can easily adhere to the bottom surface (110) and wall surface (120) of the paper tray (100).

4. 4. The method for manufacturing a paper tray for packaging food that is easy to separate and dispose of as set forth in claim 3, wherein in the stretch film coating step (S40), air pressure is applied from above to below the synthetic resin stretch film (200), so that the synthetic resin stretch film (200) stretches and easily adheres to the bottom surface (110) and wall surface (120) of the paper tray (100).

5. 2. The method for manufacturing a paper tray for packaging food that is easy to separate and dispose of as set forth in claim 1, wherein in the stretched film attaching step (S30), the synthetic resin stretched film (200) fabric is preheated to 140 to 180°C through a heater (210).

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