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

[0002] Generally, most foods delivered or sold in stores are packaged to protect them 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 packaging such foods. In other words, the food to be sold is placed in a disposable packaging container, and a thermoplastic film (also known as a sealing film) is heat-sealed around the edge of the opening to seal the packaging container. Disposable packaging containers made of synthetic resin are used because they can safely package moist and fragile foods, and can also 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 thrown away, causing serious environmental pollution. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention is made to solve these problems, and the object of the present invention is to provide a "manufacturing method for food packaging paper trays that are easy to separate and dispose of" in which the frame (main body) of the food packaging tray is made of paper, which is an environmentally friendly material, and the inner surface is coated (attached) 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 "manufacturing method for food packaging paper trays which are easily separated and disposed of" which enables the tray made of environmentally friendly paper material and the stretched film made of synthetic resin material to be separated and disposed of to increase resource recycling and further reduce environmental pollution problems by attaching an easily separable stretched film to the inner surface of the paper tray.

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

[0006] In order to achieve the above-mentioned object, the present invention provides a method for manufacturing a paper tray for food packaging that is easy to separate and dispose of. A method for manufacturing a paper tray for packaging food, which can be sealed and packaged in a sealing packaging machine using a thermoplastic film and can be easily separated and disposed of, comprising: a blanking step of peeling off a paper tray in the form of a development from a base paper of a predetermined thickness, so as to have a square bottom serving as a bottom, four wall surfaces serving as walls, each of which is provided so as to be foldable along a partial cut-and-fold line from each side of the bottom, and an outward flange serving as an adhesive part of the thermoplastic film, which is provided so as to be foldable outward along a half-blade line from the upper part of the wall surfaces; a paper tray forming step of placing the paper tray in the form of a development made in the blanking step on a base mold having a bottom and wall surfaces the same as the outer shape of the paper tray and having a tray receiving part with an open top, pressing the bottom from above and below, folding the four wall surfaces upward from each side of the bottom and standing them up, while folding and pressing the outward flange horizontally from the upper part of the wall surfaces outward to form the main body shape of the paper tray; a stretch film attaching step of placing a film fabric so as to cover an upper portion of the paper tray accommodated in the tray receiving portion of the base mold, and then pressing the synthetic resin stretched film fabric onto an upper surface of the outward flange of the paper tray through a film attaching mold, and cutting the synthetic resin stretched film fabric along an edge of the outward flange; a stretch film coating step of pressing 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 have the same internal shape as the paper tray, while the outward flange is pressed and fixed onto the upper surface of the base mold through the film attaching mold, and 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 removing the paper tray coated with the synthetic resin stretched film from the base mold and stacking it after the stretch film coating step.

[0007] In addition, the "manufacturing method for food packaging paper trays that are 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 "manufacturing method for food packaging paper tray which 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] In addition, the "manufacturing method for food packaging paper tray which is easy to separate and dispose" according to the present invention is characterized in that in the stretch film coating step, air pressure is applied from the top to the bottom of the synthetic resin stretch film so that the synthetic resin stretch film stretches and easily adheres to the bottom and wall of the paper tray.

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

[0011] According to the above-mentioned "method of manufacturing a paper tray for packaging food 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, wall and outward flange of the paper tray are coated (attached) with a synthetic resin stretched film, which has the advantage that the outer shape of the tray is firmly maintained and the outward flange to which the synthetic resin stretched film is attached can be sealed and packaged using a sealing packaging machine that uses a thermoplastic film. In particular, the synthetic resin stretched film is attached to the bottom, wall and outward flange of the paper tray through an adhesive treated on the underside to ensure the waterproof function of the paper tray, and can be easily separated from the paper tray by applying an artificial force to peel it off. Therefore, when disposing of the paper tray for packaging food after use, the coated synthetic resin stretched film is peeled off, and the paper tray and the synthetic resin stretched film, which are made of environmentally friendly materials, are separated and disposed of, which has the advantage of increasing resource recycling and further reducing environmental pollution problems.

[0012] In addition, according to the "manufacturing method for food packaging paper trays that are 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 by applying heat to the synthetic resin stretch film, the synthetic resin stretch film stretches more smoothly and is uniformly attached and coated on the bottom surface, wall surface, and outward flange of the paper tray.

[0013] In addition, according to the "manufacturing method for 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 discharged 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, according to the "manufacturing method for food packaging paper trays that are easy to separate and dispose of" of the present invention, by applying air pressure from the top to the bottom of the synthetic resin stretched film during the stretch film coating stage, the synthetic resin stretched film stretches, which has the advantage of easily adhering to the bottom and walls of the paper tray.

[0015] In addition, according to the "manufacturing method for food packaging paper trays that are easy to separate and dispose of" of the present invention, the synthetic resin stretch film treated with an adhesive is preheated to 140 to 180°C by a heater, and then the stretch film attachment step and the stretch film coating step are carried out in sequence. This allows the synthetic resin stretch film to stretch smoothly and naturally, shortening the process time for the stretch film coating step, thereby increasing productivity and enabling mass production. [Brief description 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; [Diagram 2] FIG. 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. [Diagram 3] FIG. 2 is a development view of the food packaging paper tray according to the present invention. [Figure 4] 1 is a block diagram showing a process for manufacturing a paper tray for packaging food according to the present invention. [Diagram 5] 2 is a diagram showing a schematic diagram of a paper tray forming step in a method for manufacturing a paper tray according to the present invention; [Figure 6] 2 is a diagram showing a schematic diagram of a stretch film attachment step in the paper tray manufacturing method according to the present invention. FIG. [Figure 7] FIG. 2 is a diagram illustrating a preheating step of the synthetic resin stretched film used in the present invention. [Figure 8] 2 is a schematic diagram showing a stretch film coating step in the method for manufacturing a paper tray according to the present invention; FIG. [Figure 9] 2A-2C are schematic diagrams illustrating the removal step in the method for manufacturing a paper tray according to the present invention; [Figure 10] 1 is a schematic 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 PREFERRED EMBODIMENTS

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0018] <Description of the 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 for sealing and packaging various foods such as side dishes, foods, home delivery foods, etc., through a sealing packaging machine using 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 maintain the shape of the paper tray (100) while ensuring a waterproof function.

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

[0021] In addition, the bottom surface (110) of the paper tray (100), the inner surface of the wall surface (120) and the upper surface of the outward flange (130) are coated with a synthetic resin stretched film (200), so that the outer shape of the paper tray (100) is maintained while providing a waterproof function, and food can be placed in the paper tray (100) and then sealed and packaged using a sealing packaging machine that uses a thermoplastic film (also known as a sealing film). The food packaging paper tray (100) according to the present invention is made by peeling off the sanitary and environmentally friendly single-ply pulp base paper in the form of a development 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 food packaging tray according to the present invention constructed as above will be described with reference to the accompanying drawings.

[0024] The method of manufacturing a paper tray for packaging food according to the present invention includes, as shown in FIG. 4, a blanking step (S10) in which a base paper is peeled off in the shape of a development so that a paper tray (100) can be made by folding; 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 make a main body shape; and a synthetic resin stretch film (2) is formed along an outward flange (130) while covering the top of the paper tray (100) accommodated in the base mold (400). The process includes a stretch film attachment 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 attachment 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) is a process of peeling off the base paper into an expanded shape so that the paper tray (100) can be completed by folding it, as shown in Fig. 3. The base paper can be single-ply pulp paper or corrugated cardboard. The base paper is peeled off into a shape that can be folded into the paper tray (100) using a wooden mold (also called the 'Thomson process'). In the embodiment of the present invention, the paper tray (100) has a square bottom surface (110) that functions as a bottom surface, four walls (120) that function as walls and are provided from 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 function as adhesive parts for the thermoplastic film and are provided from the upper part of the four walls (120) so that they can be folded outward at a half-blade line (121).

[0026] The paper tray forming step (S20) is a step 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 a tray receiving portion (410) with an open top, as shown in FIG. 5, and pressing the bottom (110) from top to bottom to fold and stand the four walls (120) upward from each side of the bottom (110), while folding and pressing the outward flanges (130) horizontally from the top of the walls (120) outward 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 portion (410), and the four walls (120) are folded and erected at an inclination outwardly upward along the partial cut-fold line (111), and the outward flange (130) is unfolded while being folded horizontally outwardly from the top of the four walls (120) via the half-blade line (121).

[0027] The stretch film attaching step (S30) is a process in which, as shown in Fig. 6, the synthetic resin stretch film (200) fabric with the adhesive (300) on the lower surface is arranged to cover the upper part of the paper tray (100) accommodated in the tray receiving part (410) of the base mold (400), and then the synthetic resin stretch film (200) fabric is pressed against the upper surface of the outward flange (130) of the paper tray (100) through the film attaching mold (500) and cut along the edge of the outward flange (130). As shown in Fig. 7, it is preferable that the synthetic resin stretch film (200) fabric wound in a roll is unwound and preheated to 140-180°C through the heater (210) before being supplied to the stretch film attaching step (S30). This is to ensure that the synthetic resin stretched film (200) can be smoothly stretched and attached in the stretch film coating step (S40) performed after the stretch film attachment step (S30). In addition, in the stretch film attachment step (S30), the film attachment mold (500) is preheated to 100-140°C (set to 120°C in the present embodiment) by a heater (not shown), and presses the synthetic resin stretched film (200) against the outward flange (130) while applying heat thereto. 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 the lower surface.

[0028] As shown in Fig. 8, the stretch film coating step (S40) is a process in which, after the stretch film attachment step (S30), the central portion of the synthetic resin stretch film (200) covering the opening of the paper tray (100) is pushed downward through the film coating plug mold (600) manufactured to have the same internal shape as the paper tray (100) while the outward flange (130) is pressed and fixed to the upper surface of the base mold (400) through the film attachment mold (500), and the synthetic resin stretch film (200) is stretched and attached to the bottom surface (110) and wall surface (120) of the paper tray (100) for coating. During the process of performing the stretch film coating step (S40), the synthetic resin stretch film (200) is stretched smoothly and easily because it is preheated, thereby shortening the coating process time and increasing the work productivity. Also, in the stretch 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 stretch 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 stretch film (200) is more easily attached to the bottom surface (110) and wall surface (120) of the paper tray (100) through the adhesive (300) applied to the underside. In the 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 firmly attached to the bottom surface (110) and wall surface (120) of the paper tray (100) without generating any air bubbles as the synthetic resin stretch film (200) stretches. 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 easily attached to the bottom surface (110) and wall surface (120) of the paper tray (100) as it stretches.

[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) by 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 paper tray forming step (S20), stretch film attachment step (S30), stretch film coating step (S40), and 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), so that the folded outer shape is maintained.

[0031] In particular, the food packaging paper tray (100) of the present invention has a food packaging tray frame made of paper, which is an environmentally friendly material, and its inner surface (top surface) is coated with an adhesive synthetic resin stretched film (200), which ensures waterproofing and allows the food to be sealed and packaged using a sealing packaging machine that uses thermoplastic films.

[0032] In addition, 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 (upper surface) of the paper tray (100) can be peeled off and then separated and discharged, as shown in Fig. 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 can increase the recycling of resources and further reduce environmental pollution problems. [Industrial Applicability]

[0033] The present invention can be widely used in the field of "a manufacturing method for food packaging paper trays that are easy to separate and dispose of" by making a tray frame (main body) out of paper, which is an environmentally friendly material, and coating (attaching) an adhesive synthetic resin stretched film to the inner surface, which allows for sealed packaging while ensuring waterproofing. [Explanation of symbols]

[0034] 100: Paper tray 110: Bottom 111: Partial cut - fold line 120: Wall 121: Half-edged 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: Stretching film attachment step S40: Stretch film coating stage S50: Removal stage

Claims

1. A method for producing a paper tray for packaging food, which can be used to seal and package food through a sealing and packaging machine using a thermoplastic film and can be easily disposed of; a blanking step (S10) of peeling off the paper tray (100) in the form of a development view from a base paper of a predetermined thickness to have a square bottom surface (110) functioning as a bottom part, four wall surfaces (120) each foldably provided from each side of the bottom surface (110) through a partial cut-fold line (111) functioning as a wall body, and an outward flange (130) foldably provided from the upper part of the wall surface (120) through a half-blade line (121) to the outside and functioning as an adhesive part of 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 part (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) toward the outside and pressed, to form the main body shape of the paper tray (100); a stretching film attaching step (S30) of placing a synthetic resin stretched film (200) having an adhesive (300) on its lower surface so as to cover the upper portion of the paper tray (100) accommodated in the tray receiving portion (410) of the base mold (400), and then cutting the synthetic resin stretched film (200) along the edge of the outward flange (130) while pressing the synthetic resin stretched film (200) against the upper surface of the outward flange (130) of the paper tray (100) through a film attaching mold (500); After the stretch film attaching step (S30), a stretch 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 stretch film (200) covering the opening of the paper tray (100) is pressed downward through a film coating-plug mold (600) manufactured to have the same internal shape as the paper tray (100), thereby stretching the synthetic resin stretch film (200) and attaching it to the bottom surface (110) and wall surface (120) of the paper tray (100) to coat it; The method for manufacturing a paper tray for packaging food that is easy to separate and dispose of includes a 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 (100) after the stretch film coating step (S40).

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 through 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 described in claim 3, wherein in the stretch film coating step (S40), air pressure is applied from the top to the bottom of the synthetic resin stretch film (200) so that the synthetic resin stretch film (200) stretches and easily attaches to the bottom surface (110) and the 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 according to claim 1, wherein in the stretch film attachment step (S30), the synthetic resin stretch film (200) is preheated to 140 to 180° C. through a heater (210).

Images