Sealed bag by folding process and method for processing the same

Abstract

This application discloses a sealed bag by a folding process and a method for processing the same. The method includes the steps of: setting a folding reference line in advance on the upper surface of a base paper that is laid flat; performing a first plastic package in the gap between the overlapping areas of the second folded portion and the first folded portion to form a paper roll with both ends open and the sides enclosed; lifting the paper roll and laterally pressing the paper roll along a predetermined first lateral pressing line on the paper roll to bite into the paper roll and form a first bitten portion and a third folding line, wherein the area between the first folding line and the first lateral pressing line becomes the bottom surface of the first bitten portion, and the area between the first lateral pressing line and the third folding line becomes the upper surface of the first bitten portion; and forming a finished sealed bag by plastic packaging the bottom opening of the paper roll after complete compression based on a predetermined bottom folding line.

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims priority based on Chinese Patent Application No. 202410671945.X with an application date of May 28, 2024, and incorporates the entire content of that application into this application as a whole.

[0002] (Technical Field) This application relates to the technical field of packaging product processing, and particularly to a sealed bag by a folding process and its processing method.

Background Art

[0003] In the conventional design and manufacturing technology of sealed bags, there are mainly problems such as excessive use of materials, insufficient sealing performance, complex manufacturing processes, and poor user experience of sealed bag products. Due to the imbalance in the structural design of the conventional sealed bag technology, during use, the bag may deform or tear, which may affect the overall stability. Also, in some sealed bags, there is too much wasteful use of materials, which not only increases costs but also impairs the portability of the packaging. Sealing performance is one of the points that need to be improved in the prior art. In some sealed bags, the tightness of the bottom seal design is insufficient, so the contents are likely to leak, affecting the safety of the product and the trust of consumers. Also, due to the complex opening and closing design, the user experience is poor, especially when it is necessary to operate frequently and quickly. The complexity of the manufacturing process may lead to a low degree of automation, and furthermore, the production efficiency decreases and the labor cost increases. Regarding these problems, it is necessary to develop new design solutions and technologies to improve the balance, portability, sealing performance, and production efficiency of sealed bags, and further improve the overall technical effect.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The embodiments of this invention provide a sealed bag and a method for processing the same by a folding process, and aim to solve the problems of the prior art, which have the limitation that effective consideration cannot be given to both the capacity and quality of the sealed bag. [Means for solving the problem]

[0005] In a first embodiment, the present invention discloses a method for processing a sealed bag by a folding process. A folding reference line is set in advance on the upper surface of a base paper that is laid flat, the folding reference line being parallel to a first frame line and a second frame line of the base paper, the portion surface between the first frame line and the folding reference line being the first folded portion, and the portion surface between the second frame line and the folding reference line being the second folded portion. Based on the preset first folded line, the portion of the base paper located to the left of the folding reference line is folded back so that the first frame line falls to the right of the folding reference line, and based on the preset second folded line, the portion of the base paper located to the right of the folding reference line is folded back so that the second frame line falls to the left of the folding reference line and the first frame line, and the portion surface of the second folded portion is pressed onto the first folded portion. A first plastic package is made in the gap between the overlapping areas of the second folded portion and the first folded portion to form a paper roll with both ends open and the sides enclosed. By lifting the paper roll and laterally pressing it along a preset first lateral pressure line on the paper roll, the paper roll is made to bite into the paper, forming a first bite portion and a third fold line. The area between the first fold line and the first lateral pressure line becomes the bottom surface of the first bite portion, and the area between the first lateral pressure line and the third fold line becomes the top surface of the first bite portion. By laterally pressing the paper roll along a preset second lateral pressure line on the paper roll, the paper roll is made to bite into the paper, forming a second bite portion and a fourth fold line. The area between the second fold line and the second lateral pressure line becomes the bottom surface of the second bite portion, and the area between the second lateral pressure line and the fourth fold line becomes the top surface of the second bite portion. The paper roll is completely compressed to remove air, causing the projection of the third fold line to fall onto the first fold line and the projection of the fourth fold line to fall onto the second fold line. Based on a pre-set bottom fold line, the opening at the bottom of the paper roll after complete crimping is sealed with plastic packaging to form a finished sealed bag.

[0006] Furthermore, a sealed portion is formed by pressing the partial surface of the second folding portion onto the first folding portion, and the width of the sealed portion is 1 to 5 cm.

[0007] Furthermore, prior to the first plastic package, the method further includes setting the overlapping area of ​​the second folded portion and the first folded portion as an adhesive application area, and applying an adhesive for plastic packaging to the adhesive application area, wherein the width of the adhesive application area is 2 to 6 cm.

[0008] Furthermore, the first plastic package includes heat sealing, with a heat sealing temperature of 100-350°C and a heat sealing pressure of 8-20 kg / dm 2 That is the case.

[0009] Furthermore, the duration of the heat-sealing process is 1 to 4 seconds.

[0010] In a second embodiment, the present invention also discloses a sealed bag made by a folding process obtained by the above-described method for making a sealed bag by a folding process. The sealed bag includes a first indentation and a second indentation provided on both sides of the bag body, the first indentation including a bottom surface and a top surface symmetrical with respect to a first lateral pressure line, the sides of the bottom surface of the first indentation being a first lateral pressure line and a first folding line, respectively, and the sides of the top surface of the first indentation being a first lateral pressure line and a third folding line, respectively. The second indentation includes a bottom surface and a top surface symmetrical with respect to a second lateral pressure line, the sides of the bottom surface of the second indentation being a second lateral pressure line and a second folding line, respectively, and the sides of the top surface of the first indentation being a second lateral pressure line and a fourth folding line, respectively.

[0011] Furthermore, the sealed bag includes a bottom plastic packaging area provided at the bottom of the bag body, and the bottom plastic packaging area plastically packages the bottom opening of the paper roll after complete crimping, based on a predetermined bottom folding line.

[0012] Furthermore, the upper and lower surfaces of the first indentation portion are equal in area, the upper and lower surfaces of the second indentation portion are equal in area, the upper surface area of ​​the first indentation portion is equal to the upper surface area of ​​the second indentation portion, and the upper surface area of ​​the first indentation portion is 10% to 20% of the area of ​​the first folding portion. [Effects of the Invention]

[0013] The aforementioned design of the sealed bag, with its indented section, plays a crucial role in ensuring the bag's capacity and quality. In its compact structure, the indented section allows for more compact storage when folded or stacked, saving space and reducing transportation costs. This design is particularly suitable for portable products such as cosmetic bags and snack bags, offering greater convenience as they can be easily placed in a bag or carried. It effectively addresses both the capacity and quality of the sealed bag, improving not only the product's practicality and convenience but also customer favorability and loyalty, leading to enhanced brand recognition and image. [Brief explanation of the drawing]

[0014] To more clearly explain the technical solutions of the embodiments of this application, the drawings used in describing the embodiments are briefly introduced below. The drawings in the following description represent only some embodiments of this application, and it goes without saying that those skilled in the art can obtain other drawings based on these drawings without performing any inventive work.

[0015] [Figure 1] This is a schematic diagram of the planar unfolding of the base paper of a sealing bag by the folding process provided in the embodiment of the present application. [Figure 2] This is a schematic diagram of the plan view of a sealed bag formed by a folding process after the first plastic packaging, as provided by the embodiment of the present application. [Figure 3] This is a schematic cross-sectional view of a paper roll in the forward direction provided by an embodiment of the present application. [Figure 4]It is a schematic cross-sectional view in the positive direction of the bilateral side pressing on the paper roll provided by the embodiment of the present application. [Figure 5] It is a schematic plan view of a sealed bag by a folding process provided by the embodiment of the present application.

Embodiments for Carrying out the Invention

[0016] Hereinafter, in connection with the drawings of the embodiments of the present application, the technical solution means of the embodiments of the present application will be clearly and completely described. It is needless to say that the described embodiments are only some of the embodiments of the present application, not all of them. When those skilled in the art obtain other embodiments without making inventive work based on the embodiments of the present application, all of them belong to the protection scope of the present application.

[0017] When used in this specification and the claims listed hereinafter, it should be understood that the terms "comprising" and "containing" mean that the described features, wholes, steps, operations, elements and / or configurations exist, but do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, configurations and / or combinations thereof.

[0018] Also, it should be understood that the terms used in the specification of the present application are only used for the purpose of describing specific embodiments and are not for restricting the present application. As used in the specification of the present application and the claims listed hereinafter, unless the context clearly indicates otherwise, the singular forms "a", "one", and "the" are intended to include the plural forms.

[0019] Furthermore, it should be understood that the term "and / or" used in the specification of the present application and the claims listed hereinafter refers to any combination of one or more of the objects described in association, and all possible combinations, including those combinations.

[0020] As shown in Figures 1 to 5, in a first embodiment, the present invention discloses a method for processing a sealed bag by a folding process. A folding reference line 1 is set in advance on the upper surface of a base paper that is laid flat, and the folding reference line 1 is parallel to the first frame line 11 and the second frame line 12 of the base paper, the portion surface between the first frame line 11 and the folding reference line 1 is the first folded portion 100, and the portion surface between the second frame line 12 and the folding reference line 1 is the second folded portion 200. Based on a preset first folding line 21, the portion of the base paper located to the left of the folding reference line 1 is folded back so that the first frame line 11 falls to the right of the folding reference line 1. Based on a preset second folding line 22, the portion of the base paper located to the right of the folding reference line 1 is folded back so that the second frame line 12 falls to the left of the folding reference line 1 and the first frame line 11, and the partial surface of the second folded portion 200 is pressed against the first folded portion 100. The first plastic packaging is performed in the gap between the overlapping areas of the second folded portion 200 and the first folded portion 100, forming a paper roll with both ends open and the sides enclosed. By lifting the paper roll and laterally pressing it along a preset first lateral pressing line 31 on the paper roll, the paper roll is made to bite into the material, forming a first biting portion 101 and a third folding line 23. The area between the first folding line 21 and the first lateral pressing line 31 becomes the bottom surface of the first biting portion 101, and the area between the first lateral pressing line 31 and the third folding line 23 becomes the top surface of the first biting portion 101. By laterally pressing the paper roll along a preset second lateral pressing line 32 on the paper roll, the paper roll is made to bite into the material, forming a second biting portion 102 and a fourth folding line 24. The area between the second folding line 22 and the second lateral pressing line 32 becomes the bottom surface of the second biting portion 102, and the area between the second lateral pressing line 32 and the fourth folding line 24 becomes the top surface of the second biting portion 102. The paper roll is completely compressed to remove air, so that the projection of the third fold line 23 falls onto the first fold line 21 and the projection of the fourth fold line 24 falls onto the second fold line 22. Based on the preset bottom fold line 13, the opening at the bottom of the paper roll after complete compression is plastic-packaged to form a sealed bag.

[0021] In practice, "plastic packaging" refers to packaging that is made plastic, and this process can be applied to most flexible materials. First, the base paper is laid flat on a workbench, and a folding reference line 1 is set in advance on the top surface of the film. The folding reference line 1 can be flexibly set and adjusted in advance based on the specifications of the finished product. These reference lines must be parallel to the first frame line 11 and the second frame line 12 of the base paper. The pre-set folding reference line 1 guides the subsequent folding process. Next, based on the pre-set first folding line 21, the portion of the base paper located to the left of the folding reference line 1 is folded back so that the first frame line 11 goes to the right of the folding reference line 1. Then, based on the pre-set second folding line 22, the portion of the base paper located to the right of the folding reference line 1 is folded back so that the second frame line 12 goes to the left of the folding reference line 1 and the first frame line 11. In this way, the first folded section 100 and the second folded section 200 are formed. Subsequently, the partial surface of the second folded portion 200 is pressed onto the first folded portion 100 to form the sealing portion 300. This sealing portion 300 is a crucial part of the sealed bag, ensuring its airtightness. Next, the first plastic packaging is applied to the gap between the overlapping areas of the second folded portion 200 and the first folded portion 100, forming a paper roll with open ends and enclosed sides. This step may be performed by heat sealing, adhesive application, etc. Then, the paper roll is lifted so that force is applied from the sides of the enclosed paper roll. Air introduction may be performed using specialized equipment, for example, by using a cylindrical unfolding table so that the paper roll fits on the outside of the equipment, thereby ensuring the shaping and stability of the paper roll. Subsequently, the first bite portion 101 and the third folded portion 23 are formed by laterally pressing the paper roll along a preset first lateral pressing line 31. The area between the first folding line 21 and the first lateral pressing line 31 becomes the bottom surface of the first indentation portion 101, and the area between the first lateral pressing line 31 and the third folding line 23 becomes the top surface of the first indentation portion 101. Similarly, by laterally pressing the paper roll along a preset second lateral pressing line 32, the second indentation portion 102 and the fourth folding line 24 are formed.The area between the second folding line 22 and the second side pressing line 32 becomes the bottom surface of the second indentation part 102, and the area between the second side pressing line 32 and the fourth folding line 24 becomes the upper surface of the second indentation part 102. Then, the paper roll is completely crimped, and the air in the center of the paper roll is removed. This step may be performed by thermal crimping, mechanical crimping, or the like. After complete crimping, the projections of the third folding line 23 and the fourth folding line 24 fall on the first folding line 21 and the second folding line 22 respectively, that is, the third folding line 23 is adhered to the first folding line 21, and the fourth folding line 24 is adhered to the second folding line 22, forming a complete sealed bag structure. Finally, based on the preset bottom folding line 13, the opening at the bottom of the paper roll after complete crimping is plastic packaged to form a finished sealed bag. This step may be performed by thermal crimping, adhesive application, or the like to ensure the sealing performance at the bottom of the sealed bag. By the above steps, a sealed bag with a strong structure and good sealing performance, suitable for various packaging specifications, can be manufactured. Also, the method can improve production efficiency and reduce costs.

[0022] As can be seen from the above, the design of the indentation part of the sealed bag plays an important role in ensuring the capacity and quality of the bag. In a compact structure, due to the design of the indentation part, the bag can be stored more tightly when folded or stacked, thereby saving the use space and reducing the transportation cost. Such a design is particularly suitable for portable products such as cosmetic bags and snack bags, and brings higher convenience because it can be easily put into the bag or carried around.

[0023] Furthermore, the design of the crease also takes into consideration the quality of the sealed bag. By adding a folded or reinforcing layer to the crease, the structural strength of the bag can be increased when an object is placed inside, improving the bag's durability and abrasion resistance. Such a design not only improves the practicality of the product but also better matches the customer's usage habits. The design of the crease also takes aesthetics into consideration. By carefully designing the shape and position of the crease, the bag appears more refined and multi-layered, attracting the consumer's attention. The unique and clever design of the crease not only makes an impression but also contributes to brand recognition. The design of the crease can be easily implemented from the manufacturing process and does not require complex machinery or materials. Precise folds and pressure lines allow the bag to easily fold and maintain its predetermined shape and size. In addition, the crease can be easily cleaned and maintained while the bag is in use. As can be seen from the above, the design of the sealable portion of the bag plays an important role in ensuring capacity and quality, improving the practicality and convenience of the product, as well as increasing customer favorability and loyalty, and contributing to an improvement in brand awareness and image.

[0024] Furthermore, a sealed portion 300 is formed by pressing the partial surface of the second folding portion 200 onto the first folding portion 100, and the width of the sealed portion 300 is 1 to 5 cm.

[0025] Furthermore, prior to the first plastic package, the method further includes setting the overlapping area of ​​the second folded portion 200 and the first folded portion 100 as an adhesive application area, and applying adhesive for plastic packaging to the adhesive application area, the width of which is 2 to 6 cm.

[0026] Furthermore, the first plastic package includes heat sealing, with a heat sealing temperature of 100-350°C and a heat sealing pressure of 8-20 kg / dm². 2 That is the case.

[0027] Furthermore, the heat-sealing process lasts for 1 to 4 seconds.

[0028] The width of the sealing section 300 is designed to be 1 to 5 cm. Within this range, the sealing performance of the sealed bag is ensured, while also making it easy for the user to handle and seal. An adhesive application area is set in the overlapping region of the second and first folded sections, and adhesive for plastic packaging is applied to the overlapping region of the second folded section above the first folded section. This design improves the bonding strength of the sealing section 300 and ensures long-term sealing performance. The width of the adhesive application area is 2 to 6 cm, which is sufficient to cover the overlapping region and ensure the bonding effect.

[0029] The first batch of plastic packaging typically utilizes a thermosealing method, with thermosealing temperature and pressure parameters ranging from 100 to 350°C and 8 to 20 kg / dm². 2 These settings ensure that the paper material is properly deformed and bonded during the plastic packaging process, forming a strong seal 300. The duration of the heat sealing is 1 to 4 seconds, which is determined by the properties of the paper material and the predetermined bonding strength. These detailed process parameters and technical measures together constitute the sealing bag processing method by folding, ensuring the airtightness, durability, and ease of use of the sealed bag, while also improving production efficiency and product quality. With these meticulous settings, it is possible to manufacture sealed bags that meet the needs of various application scenarios, whether it be food packaging, cosmetic packaging, or industrial product packaging.

[0030] In a second embodiment, the present invention also discloses a sealed bag made by a folding process obtained by the above-described method for making a sealed bag by a folding process. The sealed bag includes a first indentation portion 101 and a second indentation portion 102 provided on both sides of the bag body, the first indentation portion 101 including a bottom surface and a top surface symmetrical with respect to a first lateral pressure line 31, the sides of the bottom surface of the first indentation portion 101 being the first lateral pressure line 31 and the first folding line 21, respectively, and the sides of the top surface of the first indentation portion 101 being the first lateral pressure line 31 and the third folding line 23, respectively. The second biting portion 102 includes a bottom surface and an upper surface that are symmetrical with respect to the second lateral pressing line 32, with the bottom surface of the second biting portion 102 being the second lateral pressing line 32 and the second folding line 22, respectively, and the upper surface of the first biting portion 101 being the second lateral pressing line 32 and the fourth folding line 24, respectively.

[0031] Furthermore, the sealed bag includes a bottom plastic packaging area 400 provided at the bottom of the bag body, which plastically packages the bottom opening of the paper roll after complete crimping, based on a preset bottom fold line 13.

[0032] Preferably, after completing the packaging of the bottom plastic packaging area 400, folding it back along the original bottom frame line provides greater flexibility to the bottom plastic packaging area 400, facilitating the transport of the bag.

[0033] Furthermore, the upper and lower surfaces of the first biting portion 101 are equal, the upper and lower surfaces of the second biting portion 102 are equal, the upper surface area of ​​the first biting portion 101 is equal to the upper surface area of ​​the second biting portion 102, and the upper surface area of ​​the first biting portion 101 is 10% to 20% of the area of ​​the first folding portion 100.

[0034] The above-described sealed bag is manufactured by the processing method of the first embodiment. The structural design of the sealed bag aims to provide an improved packaging solution that meets functional needs and provides a good user experience.

[0035] The sealed bag includes a first indentation 101 and a second indentation 102 provided on both sides of the bag body. These indentations are crucial parts of the sealed bag and are formed by a folding and crimping process to ensure the bag's sealing performance. The first indentation 101 includes a bottom and top surface symmetrical with respect to a first lateral pressure line 31. The sides of the bottom surface are the first lateral pressure line 31 and the first fold line 21, respectively, and the sides of the top surface are the first lateral pressure line 31 and the third fold line 23, respectively. This design stabilizes the structure of the first indentation 101 and makes it easy to remove the contents from inside. The second indentation 102 also includes a bottom and top surface symmetrical with respect to a second lateral pressure line 32. The bottom surface has a second lateral pressure line 32 and a second folding line 22 on both sides, respectively, and the top surface has a second lateral pressure line 32 and a fourth folding line 24 on both sides, respectively. The design of the second indentation section 102 is similar to that of the first indentation section 101, ensuring the overall structural strength and sealing performance of the sealed bag.

[0036] Furthermore, the sealed bag further includes a bottom plastic packaging area 400 provided at the bottom of the bag body. This area plastic packages the bottom opening of the paper roll after complete crimping, based on a predetermined bottom fold line 13, thereby ensuring a bottom seal and preventing the contents (such as rice) from puncturing the bottom of the bag and leaking out due to gravity. In addition, the upper and lower surface areas of the first and second indentation parts 101 and 102 are equal, which ensures the stability and balance of the indentation parts. The equal upper surface area of ​​the first indentation part 101 and the upper surface area of ​​the second indentation part 102 means that the two indentation parts are structurally balanced, which helps maintain the stability of the entire bag. The upper surface area of ​​the first indentation part 101 is 10% to 20% of the area of ​​the first fold 100, and this design ensures that the indentation parts are neither too weak nor too heavy, improving the portability and strength of the overall packaging. As can be seen from the above, the design of the sealed bag by the folding process provided by the embodiment of the present invention achieves an improved structure and balanced sealing performance through a fine folding and crimping process, so that the bag will not puncture even when heavy objects are placed inside, improving the load-bearing capacity of the bag body, while ensuring ease of use and packaging efficiency.

[0037] The foregoing describes only specific embodiments of the present application, and the scope of protection is not limited thereto. Those skilled in the art will readily conceive of various equivalent modifications or substitutions within the scope of the art disclosed herein, and these modifications or substitutions will be included within the scope of protection. Therefore, the scope of protection is subject to the scope described in the claims.

[0038] (Note) (Note 1) A step of setting a folding reference line in advance on the upper surface of a base sheet that is laid flat, wherein the folding reference line is parallel to the first frame line and the second frame line of the base sheet, the portion surface between the first frame line and the folding reference line is the first folding portion, and the portion surface between the second frame line and the folding reference line is the second folding portion. The steps include: folding the portion of the base paper located to the left of the folding reference line based on a preset first folding line such that the first frame line falls to the right of the folding reference line; folding the portion of the base paper located to the right of the folding reference line based on a preset second folding line such that the second frame line falls to the left of the folding reference line and the first frame line, and the partial surface of the second folded portion is pressed onto the first folded portion; The steps include: applying a first plastic package to the gap between the overlapping area of ​​the second folded portion and the first folded portion to form a paper roll with both ends open and the sides enclosed; A step of lifting the paper roll and laterally pressing the paper roll along a preset first lateral pressing line on the paper roll to cause the paper roll to bite into the paper roll and form a first biting portion and a third folding line, wherein the area between the first folding line and the first lateral pressing line becomes the bottom surface of the first biting portion, and the area between the first lateral pressing line and the third folding line becomes the top surface of the first biting portion. A step of forming a second indentation portion and a fourth folding line by laterally pressing the paper roll along a second lateral pressing line predetermined on the paper roll, wherein the region between the second folding line and the second lateral pressing line becomes the bottom surface of the second indentation portion, and the region between the second lateral pressing line and the fourth folding line becomes the top surface of the second indentation portion. The steps include completely pressing the paper roll to remove air, thereby causing the projection of the third folding line to fall onto the first folding line and the projection of the fourth folding line to fall onto the second folding line, A method for processing a sealed bag by a folding process, characterized by comprising the step of forming a sealed bag by plastic packaging the opening at the bottom of the paper roll after complete crimping, based on a pre-set bottom folding line.

[0039] (Note 2) A method for processing a sealed bag by a folding process as described in Appendix 1, characterized in that a sealed portion is formed by pressing the partial surface of the second folded portion onto the first folded portion, and the width of the sealed portion is 1 to 5 cm.

[0040] (Note 3) The method for sealing a bag by a folding process as described in Appendix 1, wherein, prior to the first plastic package, the method further includes the step of setting the overlapping area of ​​the second folded portion and the first folded portion as an adhesive application area, and applying an adhesive for plastic packaging to the adhesive application area, wherein the width of the adhesive application area is 2 to 6 cm.

[0041] (Note 4) The first plastic package includes heat sealing, the heat sealing temperature is 100-350°C, and the heat sealing pressure is 8-20 kg / dm 2 A method for processing sealed bags by the folding process described in Appendix 3, characterized in that it is as described above.

[0042] (Note 5) A method for processing a sealed bag by a folding process as described in Appendix 4, characterized in that the duration of the heat sealing is 1 to 4 seconds.

[0043] (Note 6) A sealed bag made by a folding process, obtained by manufacturing a sealed bag by a folding process described in any one of Appendix 1 to 5, comprising a first indentation portion and a second indentation portion provided on both sides of the bag body, wherein the first indentation portion comprises a bottom surface and a top surface symmetrical with respect to a first lateral pressure line, the sides of the bottom surface of the first indentation portion are a first lateral pressure line and a first folding line, respectively, the sides of the top surface of the first indentation portion are a first lateral pressure line and a third folding line, respectively, the second indentation portion comprises a bottom surface and a top surface symmetrical with respect to a second lateral pressure line, the sides of the bottom surface of the second indentation portion are a second lateral pressure line and a second folding line, respectively, and the sides of the top surface of the first indentation portion are a second lateral pressure line and a fourth folding line, respectively.

[0044] (Note 7) A sealed bag by the folding process described in Appendix 6, comprising a bottom plastic packaging area provided at the bottom of the bag body, wherein the bottom plastic packaging area plastically packages the bottom opening of the paper roll after complete crimping, based on a predetermined bottom folding line.

[0045] (Note 8) A sealed bag produced by the folding process described in Appendix 6, characterized in that the upper and lower surfaces of the first indentation are equal in area, the upper and lower surfaces of the second indentation are equal in area, the upper surface area of ​​the first indentation is equal to the upper surface area of ​​the second indentation, and the upper surface area of ​​the first indentation is 10% to 20% of the area of ​​the first folded portion. [Explanation of Symbols]

[0046] 1. Folding reference line 11. First lane 12. Second lane line 100 First folding section 200 Second folding section 21. First folding line 22. Second folding line 31. First lateral pressure line 101 First insertion section 23 Third folding line 32. Second lateral pressure line 102 Second insertion section 24. Fourth folding line 13. Bottom folding line 110 Position of the first border line after the first plastic packaging. 120 Position of the second border line after the first plastic packaging. 300 Sealed part 400 Bottom plastic package area

Claims

1. A step of setting a folding reference line in advance on the upper surface of a base sheet that is laid flat, wherein the folding reference line is parallel to the first frame line and the second frame line of the base sheet, the portion surface between the first frame line and the folding reference line is the first folding portion, and the portion surface between the second frame line and the folding reference line is the second folding portion. The steps include: folding the portion of the base paper located to the left of the folding reference line based on a preset first folding line such that the first frame line falls to the right of the folding reference line; folding the portion of the base paper located to the right of the folding reference line based on a preset second folding line such that the second frame line falls to the left of the folding reference line and the first frame line, and the partial surface of the second folded portion is pressed onto the first folded portion; The steps include: applying a first plastic package to the gap between the overlapping area of ​​the second folded portion and the first folded portion to form a paper roll with both ends open and the sides enclosed; A step of lifting the paper roll and laterally pressing the paper roll along a preset first lateral pressing line on the paper roll to bite into the paper roll and form a first biting portion and a third folding line, wherein the area between the first folding line and the first lateral pressing line becomes the bottom surface of the first biting portion, and the area between the first lateral pressing line and the third folding line becomes the top surface of the first biting portion. A step of forming a second indentation portion and a fourth folding line by laterally pressing the paper roll along a second lateral pressing line predetermined on the paper roll, wherein the region between the second folding line and the second lateral pressing line becomes the bottom surface of the second indentation portion, and the region between the second lateral pressing line and the fourth folding line becomes the top surface of the second indentation portion. The paper roll is completely compressed to remove air, thereby causing the projection of the third folding line to fall onto the first folding line and the projection of the fourth folding line to fall onto the second folding line. A method for processing a sealed bag by a folding process, characterized by comprising the step of forming a sealed bag by plastic packaging the opening at the bottom of the paper roll after complete crimping, based on a pre-set bottom folding line.

2. A method for processing a sealed bag by a folding process according to claim 1, characterized in that a sealed portion is formed by pressing the partial surface of the second folded portion onto the first folded portion, and the width of the sealed portion is 1 to 5 cm.

3. The method for sealing a bag by a folding process according to claim 1, wherein, prior to the first plastic package, the method further includes the step of setting the overlapping area of ​​the second folded portion and the first folded portion as an adhesive application area, and applying an adhesive for plastic packaging to the adhesive application area, wherein the width of the adhesive application area is 2 to 6 cm.

4. The first plastic package includes heat sealing, the heat sealing temperature being 100-350°C, and the heat sealing pressure being 8-20 kg / dm ２ A method for processing a sealed bag by a folding process according to claim 3, characterized in that it is the same as described in claim 3.

5. The method for processing a sealed bag by a folding process according to claim 4, characterized in that the duration of the heat sealing is 1 to 4 seconds.

6. A sealed bag made by a folding process, obtained by manufacturing a sealed bag made by a folding process according to any one of claims 1 to 5, comprising a first indentation portion and a second indentation portion provided on both sides of the bag body, wherein the first indentation portion comprises a bottom surface and a top surface symmetrical with respect to a first lateral pressure line, the sides of the bottom surface of the first indentation portion are a first lateral pressure line and a first folding line, respectively, the sides of the top surface of the first indentation portion are a first lateral pressure line and a third folding line, respectively, the second indentation portion comprises a bottom surface and a top surface symmetrical with respect to a second lateral pressure line, the sides of the bottom surface of the second indentation portion are a second lateral pressure line and a second folding line, respectively, and the sides of the top surface of the first indentation portion are a second lateral pressure line and a fourth folding line, respectively.

7. A sealed bag by a folding process according to claim 6, comprising a bottom plastic packaging area provided at the bottom of the bag body, wherein the bottom plastic packaging area plastically packages the bottom opening of the paper roll after complete crimping, based on a predetermined bottom folding line.

8. A sealed bag by a folding process according to claim 6, characterized in that the upper and lower surfaces of the first indentation are equal in area, the upper and lower surfaces of the second indentation are equal in area, the upper surface area of ​​the first indentation is equal to the upper surface area of ​​the second indentation, and the upper surface area of ​​the first indentation is 10% to 20% of the area of ​​the first folded portion.

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