Double-layer sharp-bottom bag

Abstract

The utility model aims to provide a double-layer sharp-bottomed bag which comprises an outer-layer bag and an inner-layer bag, an outer opening is formed in the outer-layer bag, a plurality of outer through holes are formed in two opposite side walls of the outer-layer bag, the inner-layer bag is arranged on the inner side wall of the outer-layer bag in an attached mode, an inner opening is formed in the inner-layer bag, the orientation of the inner opening is consistent with that of the outer opening, and the outer-layer bag is provided with a plurality of outer through holes. A plurality of inner through holes are formed in the two opposite side walls of the inner layer bag, and the inner through holes and the outer through holes are coaxially formed in a one-to-one correspondence mode. Therefore, the double-layer sharp-bottomed bag provided by the utility model has environmental protection property, oil resistance and heat insulation property.

Description

Technical Field

[0001] This utility model relates to the technical field of food bags, and in particular to a double-layered pointed bottom bag. Background Technology

[0002] With increasing public awareness of environmental protection, the sustainability of food packaging materials has become a growing concern. Currently, plastic food bags made of polyethylene (PE) or polypropylene (PP) are widely used in the packaging of breakfast foods (such as fried dough sticks, pancakes, and fried snacks). These plastic bags are characterized by low cost and excellent waterproof and oil-proof properties, but their non-degradable nature leads to environmental pollution problems. Studies show that ordinary plastic bags take hundreds of years to completely decompose in the natural environment, and their incineration produces toxic gases, posing a long-term threat to the ecological environment and human health.

[0003] Furthermore, existing plastic bags have technical limitations in high-temperature food packaging scenarios. For example, freshly fried foods like fried dough sticks are very hot, which may cause the plastic bag to release low-molecular-weight compounds when heated, posing a potential food safety hazard. At the same time, plastic bags have limited load-bearing capacity and are easily damaged by sharp food edges or localized high temperatures, leading to grease leakage and affecting the consumer experience.

[0004] In recent years, some companies have attempted to replace plastic bags with single-layer paper bags to address environmental concerns. However, ordinary paper bags have the following drawbacks: First, they lack sufficient oil resistance; untreated paper is easily permeated by grease when in contact with oil, causing the bag to soften and break. Second, they lack structural strength; single-layer paper bags cannot withstand the weight and temperature shock of high-temperature fried foods, easily deforming or breaking at the bottom. Finally, they have poor heat insulation, failing to effectively block heat transfer from hot foods, potentially causing burns to consumers or rapid cooling of food, affecting its taste.

[0005] Furthermore, given the increasingly stringent environmental policies, there is an urgent need to develop a food bag that combines environmental friendliness, oil resistance, and heat insulation. Therefore, this application proposes a double-layered pointed bottom bag. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a double-layered pointed bottom bag that is environmentally friendly, oil-proof, and heat-insulating.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] A double-layered pointed-bottom bag, comprising:

[0009] The outer bag has an external opening inside, and several external through holes are provided on the opposite side walls of the outer bag.

[0010] The inner bag is attached to the inner sidewall of the outer bag. The inner bag has an inner opening, and the orientation of the inner opening is the same as that of the outer opening. Several inner through holes are provided on the opposite sidewalls of the inner bag, and each inner through hole is coaxially arranged with each outer through hole.

[0011] Optionally, the outer bag includes an outer paper layer, which includes a front sheet, a back sheet, a connecting piece, a bottom sheet, and two side sheets. The two side sheets are respectively connected to opposite sides of the front sheet. The back sheet is connected to one of the side sheets away from the side edge of the front sheet. The connecting piece is connected to the other side sheet away from the side edge of the front sheet. The bottom sheet is connected to the bottom edges of the front sheet, the back sheet, the connecting piece, and the two side sheets. The two side sheets are folded to bond the back sheet to the connecting piece, and the bottom sheet is folded to bond to the back sheet, thereby forming the outer bag.

[0012] Optionally, the front sheet has a notch on its side edge away from the bottom sheet, and the bottom sheet has a protrusion on its side edge away from the front sheet, the protrusion being adapted to the notch.

[0013] Optionally, the inner bag includes an inner layer of paper, the structure of which is identical to that of the outer layer of paper. The inner layer of paper is stacked on top of the outer layer of paper, and the outer layer of paper and the inner layer of paper are folded simultaneously to form the double-layered pointed-bottom bag.

[0014] Optionally, the width of the back sheet of the outer paper is greater than the width of the back sheet of the inner paper, and the width of the connecting piece of the outer paper is less than the width of the connecting piece of the inner paper.

[0015] Optionally, the inner layer paper is greaseproof paper.

[0016] Optionally, the side panel includes two side folds connected to each other, with one of the two side folds connected to the front panel and the other of the two side folds connected to the rear panel / connecting panel.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] This utility model discloses a double-layered pointed-bottom bag, comprising an outer bag and an inner bag. The outer bag has an external opening and several external through holes on its opposite side walls. The inner bag is fitted onto the inner side wall of the outer bag and has an internal opening facing the same direction as the external opening. Several internal through holes are also provided on its opposite side walls, with each internal through hole corresponding to and coaxially arranged with one of the external through holes. Thus, the double-layered pointed-bottom bag provided by this application combines environmental friendliness, oil resistance, and heat insulation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a double-layered pointed-bottom bag according to one embodiment of the present invention;

[0021] Figure 2 for Figure 1 The plan view of the double-layered pointed bottom bag shown;

[0022] Figure 3 This is a schematic diagram of the outer paper structure according to one embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of one embodiment of the present invention, in which the outer and inner layers of paper are stacked and the side sheet is folded.

[0024] Figure 5 for Figure 4 The diagram shows a structural schematic of the side panel being folded at another angle after the outer and inner layers of paper are stacked together.

[0025] Figure 6 This is a schematic diagram of the overlapping state of the rear piece and the connecting piece according to one embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. Double-layer pointed bottom bag; 100. Outer bag; 200. Inner bag; 110. External opening; 210. Internal opening; 101. Outer paper; 120. Front piece; 130. Back piece; 140. Connecting piece; 150. Bottom piece; 160. Side piece; 121. Notch; 151. Protrusion; 201. Inner paper; 161. Side fold. Detailed Implementation

[0028] To facilitate understanding of this utility model, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model.

[0029] like Figure 1As shown, a double-layered pointed-bottom bag 10 includes an outer bag 100 and an inner bag 200. The outer bag 100 has an outer opening and several external through holes 110 on its opposite side walls. The inner bag 200 is fitted onto the inner side wall of the outer bag 100 and has an inner opening 210, the orientation of which is the same as that of the outer opening. Several internal through holes are provided on the opposite side walls of the inner bag 200, and each internal through hole is coaxially arranged with each external through hole 110.

[0030] It should be noted that the coaxial structure of the outer bag 100 and the inner bag 200, with their external through-holes 110 and internal through-holes, forms a through-flow channel, allowing the hot steam generated by high-temperature foods (such as fried dough sticks) to quickly escape from the bag, preventing moisture from accumulating in the inner layer and causing the paper bag to soften and break. The through-hole layout simultaneously considers breathability and oil penetration prevention, accelerating cooling while preventing grease from directly overflowing through the through-holes, ensuring the structural integrity of the paper bag. In one embodiment, the inner bag 200 is made of oil-resistant paper, forming a barrier layer when in contact with grease to prevent grease from penetrating to the outer bag 100; the outer bag 100 is made of high-grammage virgin pulp paper, increasing breathability through the external through-holes 110 while reducing material usage and maintaining tear resistance. The double-layer fabric effectively enhances load-bearing capacity, stably supporting high-temperature fried foods. Furthermore, the double-layer structure forms an air insulation layer, effectively blocking the transfer of heat from the high-temperature food to the outside, preventing burns to consumers and slowing down the cooling rate of the food to maintain its crispness. The consistent opening direction of both the inner and outer sides simplifies food handling, allowing users to quickly access food through a single opening, thus improving efficiency in street food scenarios. Furthermore, the all-paper material is fully biodegradable, reducing the degradation cycle of a single package to 3-6 months after replacing traditional plastic bags, complying with the "plastic restriction order" policy. In summary, the double-layered pointed-bottom bag 10 of this application combines environmental friendliness, oil resistance, and heat insulation.

[0031] like Figures 2 to 5 As shown, in one embodiment, the outer bag 100 includes an outer paper 101, which includes a front sheet 120, a back sheet 130, a connecting piece 140, a bottom sheet 150, and two side sheets 160. The two side sheets 160 are respectively connected to the opposite sides of the front sheet 120. The back sheet 130 is connected to one of the side sheets 160 away from the side edge of the front sheet 120. The connecting piece 140 is connected to the other side sheet 160 away from the side edge of the front sheet 120. The bottom sheet 150 is connected to the bottom edges of the front sheet 120, the back sheet 130, the connecting piece 140, and the two side sheets 160. The two side sheets 160 are folded to bond the back sheet 130 to the connecting piece 140, and the bottom sheet 150 is folded to bond to the back sheet 130, thereby forming the outer paper 101 into the outer bag 100.

[0032] It should be noted that the front sheet 120, rear sheet 130, and connecting sheet 140 are folded and bonded together by the side sheet 160 to form a continuous closed cavity. The bottom sheet 150 is then folded and bonded to the rear sheet 130, eliminating the gaps at the seams of traditional paper bags. This improves the sealing of the side walls and bottom of the outer bag 100, allowing hot steam to escape only through the pre-set external opening 110, preventing grease from seeping out from the seams. In particular, the bottom sheet 150 is folded upwards and bonded to the rear sheet 130 to form a double-layered bag bottom structure, which further improves the compressive strength compared to a single-layer paper bag, and can stably bear the concentrated load of fried foods. The structure of the side sheet 160 makes the cross-section of the bag trapezoidal and flared, reducing the risk of deformation caused by food squeezing the side walls. Furthermore, the outer paper 101 can be die-cut to form an integral structure, and then glued and folded to form a complete outer bag 100, facilitating automated production. Furthermore, the staggered bonding structure between the connecting piece 140 and the rear piece 130 can prevent adhesive from entering the bag and contaminating the food.

[0033] like Figure 2 and Figure 3 As shown, in one embodiment, the front sheet 120 has a notch 121 on the side edge away from the bottom sheet 150, and the bottom sheet 150 has a protrusion 151 on the side edge away from the front sheet 120, and the protrusion 151 is adapted to the notch 121.

[0034] It should be noted that the side edge of the front piece 120 away from the bottom piece 150, that is, the outer opening of the outer bag 100, has a notch 121. Therefore, there is a height difference between the front piece 120 and the back piece 130, making it easier for consumers to open the bag. Secondly, the bottom piece 150 has a protrusion 151, which increases the contact area between the bottom piece 150 and the back piece 130 after folding, so that the adhesive seam is away from the bottom edge of the back piece 130, thereby effectively improving the load-bearing strength of the bag. In addition, it should be noted that the outer paper 101 is supplied in roll form. Therefore, during die-cutting, it is only necessary to perform die-cutting sequentially at predetermined intervals to form the notch 121 on the front piece 120 and the protrusion 151 on the bottom piece 150.

[0035] like Figure 3 As shown, in one embodiment, the inner bag 200 includes an inner paper 201, the structure of which is the same as that of the outer paper 101. The inner paper 201 is stacked on the outer paper 101, and the outer paper 101 and the inner paper 201 are folded together to form a double-layered pointed bottom bag 10.

[0036] It should be noted that the outer layer paper 101 and the inner layer paper 201 adopt an identical structural design, and can be cut and folded on the same tooling mold, avoiding misalignment between the inner layer paper 201 and the outer layer paper 101. After the inner layer paper 201 and the outer layer paper 101 are stacked and glued together, they are then glued and folded to form a double-layer pointed bottom bag 10. Finally, the double-layer pointed bottom bag 10 is punched as a whole using a punching mold, so that the outer through hole 110 of the outer layer bag 100 and the inner through hole of the inner layer bag 200 are coaxially arranged.

[0037] like Figure 2 , Figure 3 and Figure 6 As shown, in one embodiment, the width D1 of the back sheet 130 of the outer paper 101 is greater than the width D2 of the back sheet 130 of the inner paper 201, and the width E1 of the connecting piece 140 of the outer paper 101 is less than the width E2 of the connecting piece 140 of the inner paper 201.

[0038] Thus, when the outer paper 101 and the inner paper 201 are stacked, part of the structure of the back piece 130 of the outer paper 101 will extend beyond the back piece 130 of the inner paper 201, and part of the structure of the connecting piece 140 of the inner paper 201 will extend beyond the connecting piece 140 of the outer paper 101. Thus, when the overall structure after the inner paper 201 and the outer paper 101 are stacked is folded, the part of the back piece 130 of the outer paper 101 that extends beyond can be glued and fixed to the connecting piece 140 of the outer paper 101, while the connecting piece 140 of the inner paper 201 will overlap the back piece 130 of the inner paper 201, so that the inner paper 201 stably and reliably separates the adhesive seam of the outer paper 101 from the inside of the bag.

[0039] like Figure 2 and Figure 3 As shown, in one embodiment, the side panel 160 includes two side folds 161 connected to each other, and one of the two side folds 161 is connected to the front panel 120, while the other of the two side folds 161 is connected to the rear panel 130 / connecting piece 140.

[0040] It should be noted that the side panel 160 is composed of two side folds 161, which provides sufficient opening space for the food bag to hold a certain amount of food when opened for use. This also makes it easier for consumers to open the food bag.

[0041] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the utility model patent. Unless otherwise specifically defined, the installation / fixing / setting mentioned in this utility model can be understood to include, but is not limited to, locking and fixing with screws / bolts, and welding. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A double-layer gusset bag characterized by, The utility model relates to a double-layer sharp bottom bag, comprising: an outer bag with an outer opening, a plurality of outer through holes on the two opposite side walls of the outer bag; an inner bag with an inner opening, the inner bag being attached to the inner side wall of the outer bag, the direction of the inner opening being consistent with the direction of the outer opening, a plurality of inner through holes on the two opposite side walls of the inner bag, each inner through hole being coaxially arranged with each outer through hole.

2. The double-layer gusset bag of claim 1, wherein, The outer bag comprises outer paper, the outer paper comprises a front sheet, a back sheet, a connecting sheet, a bottom sheet and two side sheets, the two side sheets being connected to the two opposite side edges of the front sheet, the back sheet being connected to one of the side sheets away from the front sheet, the connecting sheet being connected to the other side sheet away from the front sheet, the bottom sheet being connected to the bottom edges of the front sheet, the back sheet, the connecting sheet and the two side sheets, the two side sheets being folded to make the back sheet and the connecting sheet adhere to each other, the bottom sheet being folded to adhere to the back sheet, so that the outer paper forms the outer bag.

3. The double-layer gusset bag of claim 2, wherein, The side edge of the front sheet away from the bottom sheet is provided with a notch, the side edge of the bottom sheet away from the front sheet is provided with a protrusion, the protrusion being matched with the notch.

4. The double-layer gusset bag of claim 2, wherein, The inner bag comprises inner paper, the structure of the inner paper being the same as that of the outer paper, the inner paper being superimposed on the outer paper, the outer paper and the inner paper being folded at the same time to form the double-layer sharp bottom bag.

5. The double-layer gusset bag of claim 4, wherein, The width of the back sheet of the outer paper is greater than that of the back sheet of the inner paper, and the width of the connecting sheet of the outer paper is less than that of the connecting sheet of the inner paper.

6. The double-layer gusset bag of claim 4, wherein, The inner paper is oil-proof paper.

7. The double-layer gusset bag of claim 2, wherein, The side sheet comprises two side folding parts, the two side folding parts being connected, one of the two side folding parts being connected to the front sheet, and the other of the two side folding parts being connected to the back sheet / connecting sheet.

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