Yin-yang surface composite film and pickled Chinese cabbage boiling-resistant aluminized yin-yang self-standing bag
The self-standing bag is made by splicing and bonding two-sided composite films, which solves the problem that sauerkraut packaging bags cannot achieve a transparent side and silver backlight. This achieves high-efficiency production and excellent mechanical properties, meeting the preservation requirements of sauerkraut.
Patent Information
- Application Number
- CN202423101977.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Existing technologies lack transparent, silver-backlit, two-tone stand-up pouches for sauerkraut packaging, which cannot achieve the function of blocking light on the front of the bag and allowing observation of the product's condition on the back. Furthermore, conventional aluminum-plated packaging bags are prone to delamination after boiling sterilization.
The yin-yang composite film, consisting of a polyester surface layer, an ink layer, an adhesive layer, a yin-yang effect layer, a nylon barrier layer, and a polyethylene heat-sealing layer, is used to create a yin-yang stand-up pouch through a splicing and composite process. This achieves the effect of the front of the bag being opaque while the back is translucent, and the pouch is then heat-sealed to form a stand-up pouch.
This technology enables efficient production of sauerkraut packaging bags, simplifies production processes, improves production efficiency, and reduces equipment costs. It also possesses excellent mechanical properties and resistance to boiling water and acid/alkali corrosion, ensuring the preservation quality of the sauerkraut.
Smart Images
Figure CN223645338U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a composite film self-standing bag technical field, especially in a kind of yin and yang face composite film and sour vegetable water-boiling-resistant aluminized yin and yang self-standing bag. BACKGROUND
[0002] Sour vegetable is a kind of pickled vegetable product that is popular all over the country, and the annual output of sour vegetable products is huge. The use of packaging bags for sour vegetable products is also increasing year by year. During the pickling process, lactic acid bacteria fermentation of sour vegetable products produces acidic substances such as lactic acid and acetic acid, with a pH value generally ranging from 3.5 to 4.2. The acidic substances have a certain corrosive effect on the packaging bags, which can reduce the interlayer peeling strength of the packaging bags and cause the packaging bags to delaminate, resulting in a decrease in barrier properties and deterioration of sour vegetable products. At the same time, sour vegetable products need to be sterilized by boiling after packaging, which further increases the requirements for packaging bags.
[0003] Since conventional aluminized packaging bags will delaminate and delayer after being sterilized by boiling, the current mainstream sour vegetable packaging is generally plastic-plastic structure transparent packaging bags or completely opaque pure aluminum packaging bags. The bag type is mainly three-edge sealed bags, and only a small part of high-end products are self-standing bags. However, there is no yin and yang self-standing bag with one transparent side and one silver-colored backlight in the prior art, which cannot achieve the functions of light-proof on the front side and observable product status on the back side of the bag body. SUMMARY
[0004] The utility model discloses a yin and yang face composite film and a sour vegetable water-boiling-resistant aluminized yin and yang self-standing bag to solve the problem of no yin and yang self-standing bag with one transparent side and one silver-colored backlight for loading sour vegetables in the prior art, which cannot achieve the functions of light-proof on the front side and observable product status on the back side of the bag body, to solve the problems raised in the background.
[0005] The technical solution of the utility model is as follows:
[0006] A yin and yang face composite film and a sour vegetable water-boiling-resistant aluminized yin and yang self-standing bag, the yin and yang face composite film is composed of a polyester surface layer, an ink layer, a first adhesive layer, a yin and yang effect layer, a second adhesive layer, a nylon barrier layer, a third adhesive layer and a polyethylene heat-seal layer from outside to inside.
[0007] The lower end face of the polyester surface layer is gravure printed with the ink layer, the polyester surface layer and the yin and yang effect layer are bonded by the first adhesive layer, the yin and yang effect layer and the nylon barrier layer are bonded by the second adhesive layer, and the nylon barrier layer and the polyethylene heat-seal layer are bonded by the third adhesive layer.
[0008] Further, the polyester surface layer is a biaxially stretched polyethylene terephthalate film with an inner surface treated by corona discharge and a thickness of 10 ～ 14 μm.
[0009] Further, the ink layer is a benzene-free and ketone-free high-temperature-resistant polyurethane gravure ink coating layer.
[0010] Further, the first adhesive layer is a double-component polyurethane adhesive layer specially used for aluminized film.
[0011] Further, the yin-yang effect layer is composed of aluminized polyester layers and polyester inner layers spliced on the left and right, and the thickness of the aluminized polyester layers and the polyester inner layers is 10 ～ 14 μm.
[0012] Further, the width ratio of the aluminized polyester layers to the polyester inner layers is 4:3, and the width of the splicing joint between the aluminized polyester layers and the polyester inner layers is 0-0.5 mm.
[0013] Further, the second adhesive layer and the third adhesive layer are both double-component dry polyurethane adhesive layers.
[0014] Further, the nylon barrier layer is a double-corona and double-stretch nylon film with a thickness of 12 ～ 17 μm.
[0015] Further, the polyethylene heat-seal layer is a three-layer co-extrusion polyethylene film layer.
[0016] Further, the self-standing bag is formed by folding and heat-sealing the yin-yang composite film, and the self-standing bag comprises a bag body back surface, a bag body front surface, a bag body bottom surface, a bag body side edge heat-seal area and a bag body bottom surface heat-seal area, the bag body front surface and the bag body bottom surface of the self-standing bag are both composed of the yin-yang composite film with the aluminized polyester layer part, the bag body back surface of the self-standing bag is composed of the yin-yang composite film with the polyester inner layer part, the left and right side edges of the self-standing bag are the bag body side edge heat-seal area, and the edge of the bag body bottom surface is the bag body bottom surface heat-seal area.
[0017] Compared with the prior art, the utility model has the following beneficial effects:
[0018] 1. A yin-yang composite film adopts splicing and compounding process, splices and compounds aluminized polyester layers and polyester inner layers with a width ratio of 4:3 on the left and right with a polyester surface layer, and further compounds with a nylon barrier layer and a polyethylene heat-seal layer to form the yin-yang composite film. The yin-yang composite film can be cut and divided without needing to be cut and divided, and can form a yin-yang self-standing bag with a front surface and a bottom surface not transparent and a back surface transparent through a bag making machine. The production mode is simple, the production cycle is short, the production efficiency is much higher than that of a bottom-inserted self-standing bag, and the equipment cost is saved.
[0019] 2. The yin-yang composite film has a four-layer structure of a polyester surface layer, a yin-yang effect layer, a nylon barrier layer and a polyethylene heat-seal layer, has good ink adhesion, excellent mechanical properties, high strength, resistance to boiling and cooking, strong acid and alkali corrosion resistance, and advantages such as gas barrier and aroma preservation
[0020] 3. A water-resistant, boil-resistant, aluminum-coated, self-standing bag for pickled vegetables, formed by folding and heat-sealing a composite film with two sides, can preserve pickled vegetables; one side is transparent and the other side is silver and backlit, so that the front of the bag is light-proof and the back can be used to observe the condition of the product inside the bag. The self-standing bag consists of a back side, a front side, and a bottom side, and the joints are fixed by heat sealing to achieve the self-standing function. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the cross-section of the yin-yang composite membrane;
[0022] Figure 2 This is a structural diagram of a stand-up pouch;
[0023] Figure 3 This is a structural diagram illustrating the folding method during heat sealing of a stand-up pouch.
[0024] In the diagram: 1. Polyester surface layer; 2. Ink layer; 3. First adhesive layer; 4. Yin-Yang effect layer; 4-1. Aluminum-plated polyester layer; 4-2. Polyester inner layer; 5. Second adhesive layer; 6. Nylon barrier layer; 7. Third adhesive layer; 8. Polyethylene heat-sealing layer; 9. Seam; 10. Back of bag; 11-1. Heat-sealed area on the side of bag; 11-2. Heat-sealed area on the bottom of bag; 12. Front of bag; 13. Bottom of bag. Detailed Implementation
[0025] Specific implementation method one: See Figure 1 As shown, a yin-yang composite film and a pickled cabbage water-resistant aluminum-plated yin-yang self-standing bag are provided. The yin-yang composite film in this embodiment is composed of a polyester surface layer 1, an ink layer 2, a first adhesive layer 3, a yin-yang effect layer 4, a second adhesive layer 5, a nylon barrier layer 6, a third adhesive layer 7, and a polyethylene heat-sealing layer 8 from the outside to the inside.
[0026] The lower end face of the polyester surface layer 1 is gravure-printed with an ink layer 2. The polyester surface layer 1 and the anisotropic effect layer 4 are bonded together by a first adhesive layer 3. The anisotropic effect layer 4 and the nylon barrier layer 6 are bonded together by a second adhesive layer 5. The nylon barrier layer 6 and the polyethylene heat-sealing layer 8 are bonded together by a third adhesive layer 7.
[0027] Furthermore, this yin-yang composite film can be manufactured into yin-yang stand-up pouches with opaque front and bottom sides and translucent back side using a bag-making machine without cutting or slitting. This saves on cutting and additional lamination processes, simplifies production, shortens the production cycle, and significantly increases production efficiency compared to bottom-inserted stand-up pouches, while also saving on equipment costs.
[0028] Specific Implementation Method Two: See Figure 1 As shown, the polyester surface layer 1 in this embodiment is a biaxially oriented polyethylene terephthalate film with an inner surface treated with corona discharge and a thickness of 10-14 μm.
[0029] Further, the polyester surface layer 1 is a biaxially oriented polyethylene terephthalate film, the inner surface is treated by corona, and the thickness is 10-14 μm, preferably 12 μm. It provides high ink adhesion for the positive and negative composite film. Moreover, the polyester film has excellent mechanical properties and high tensile strength.
[0030] Specific embodiment three: see Figure 1 As shown in the figure, the ink layer 2 of the embodiment is a benzene-free and ketone-free high-temperature-resistant polyurethane gravure ink coating layer.
[0031] Specific embodiment four: see Figure 1 As shown in the figure, the first adhesive layer 3 of the embodiment is a two-component polyurethane adhesive layer special for aluminized film.
[0032] Further, the two-component polyurethane adhesive special for aluminized film is soft and elastic after curing, and the elastomer can absorb internal stress, effectively relieving the transfer problem of the aluminized layer.
[0033] Specific embodiment five: see Figure 1 As shown in the figure, the positive and negative effect layer 4 of the embodiment is composed of aluminized polyester layer 4-1 and polyester inner layer 4-2 spliced on the left and right, and the thickness of the aluminized polyester layer 4-1 and the polyester inner layer 4-2 is 10 ～ 14 μm.
[0034] Further, the aluminized polyester layer 4-1 and the polyester inner layer 4-2 are spliced to form the positive and negative area effect of the composite film. The aluminized polyester layer 4-1 is an opaque area, and the polyester inner layer 4-2 is a transparent area. The aluminized polyester layer 4-1 is a silver opaque enhanced coating aluminized film, and the thickness is 10 ～ 14 μm, preferably 12 μm. The polyester inner layer 4-2 is a common transparent biaxially oriented polyester film, and the thickness is 10 ～ 14 μm, preferably 12 μm.
[0035] Specific embodiment six: see Figure 1 As shown in the figure, the width ratio of the aluminized polyester layer 4-1 and the polyester inner layer 4-2 of the embodiment is 4:3, and the width of the splicing joint 9 between the aluminized polyester layer 4-1 and the polyester inner layer 4-2 is 0-0.5 mm.
[0036] Further, since the composite film covering the aluminized polyester layer 4-1 area needs to be processed into two surfaces of the bag body front surface 12 and the bag body bottom surface 13, the width of the aluminized polyester layer 4-1 is greater than that of the polyester inner layer 4-2, and the width ratio is preferably 4:3. During processing, the splicing joint of the aluminized polyester layer 4-1 and the polyester inner layer 4-2 at the synchronous unwinding position needs to be controlled within the range of 0-0.5 mm. If the joint is too small, the two layers of film are easy to bulge; if the joint is too large, it affects the heat sealing and barrier properties of the bag body.
[0037] Specific implementation seven: see Figure 1 As shown in the figure, the second adhesive layer 5 and the third adhesive layer 7 of the embodiment are both two-component dry polyurethane adhesive layers.
[0038] Specific implementation eight: see Figure 1 As shown in the figure, the nylon barrier layer 6 of the embodiment is a 12 ～ 17μm thick biaxially stretched nylon film with double corona.
[0039] Further, the thickness of the nylon barrier layer 6 is 12 ～ 17μm, preferably 15μm, and the biaxially stretched nylon film with double corona has the advantages of excellent toughness and strong resistance to acid and alkali corrosion. It can block gas and preserve aroma, and can be used as a barrier layer of a positive-negative composite film.
[0040] Specific implementation nine: see Figure 1 As shown in the figure, the polyethylene heat-seal layer 8 of the embodiment is a three-layer co-extruded polyethylene film layer.
[0041] During processing, the polyester surface layer 1 is placed in the first placement position of the compounder, the first adhesive layer 3 is coated by the coating unit of the compounder, and the aluminum-plated polyester layer 4-1 and the polyester inner layer 4-2 are placed on the A axis and the B axis of the second placement position of the compounder, respectively. During compounding, the polyester surface layer 1 coated with adhesive is laminated under the action of the compounding pressure roller and completed by winding at the same time as the A axis and the B axis are unwound. The splicing joint of the aluminum-plated polyester layer 4-1 and the polyester inner layer 4-2 is controlled within the range of 0-0.5mm during synchronous unwinding. The polyester surface layer 1 is compounded with the aluminum-plated polyester layer 4-1 and the polyester inner layer 4-2, and the secondary compounding with the nylon barrier layer 7 is completed within 4 hours, so as to prevent the first adhesive layer 3 from penetrating from the splicing joint area 9 of the aluminum-plated polyester layer and the polyester inner layer and causing the reverse adhesion of the film roll, which makes it impossible to continue production. After the secondary compounding is completed, the compound film is compounded with the polyethylene heat-seal layer 8 again, and the positive-negative composite film is obtained after curing.
[0042] Specific implementation ten: see Figure 2 and 3 As shown in the figure, the self-standing bag of the embodiment is formed by folding and heat-sealing the positive-negative composite film, and the self-standing bag includes a bag body back surface 10, a bag body front surface 12, a bag body bottom surface 13, a bag body side edge heat-seal area 11-1, and a bag body bottom surface heat-seal area 11-2. The bag body front surface 12 and the bag body bottom surface 13 of the self-standing bag are both composed of the positive-negative composite film with the aluminum-plated polyester layer 4-1 part, the bag body back surface 10 of the self-standing bag is composed of the positive-negative composite film with the polyester inner layer 4-2 part, the left and right side edges of the self-standing bag are the bag body side edge heat-seal area 11-1, and the edge of the bag body bottom surface 13 is the bag body bottom surface heat-seal area 11-2.
[0043] Further, the compound film of the female-male bag is punched by a self-standing bag making machine to form a heat-sealed connecting hole, and then is bent in a "W" shape. During the bending, the spliced joint area 9 of the aluminum-plated polyester layer 4-1 and the polyester inner layer 4-2 is located at the inner side of the bottom of the self-standing bag. The front surface 12 of the bag and the back surface 10 of the bag are heat-pressed by a hot sealing iron to form a bag side heat-sealed area 11-1. The lower end of the bag bottom surface 13 is heat-pressed by a hot sealing iron to form a bag bottom heat-sealed area 11-2, and the spliced joint area 9 of the aluminum-plated polyester layer 4-1 and the polyester inner layer 4-2 is completely located in the bag bottom heat-sealed area 11-2, so as to prevent the spliced joint area 9 from affecting the barrier property of the self-standing bag. The bag bottom heat-sealed area 11-2 supports the bag bottom surface 13. After the bag compound film is heat-sealed by a hot sealing iron, the bag is cut by a cutter, and a self-standing bag with opaque front and bottom surfaces and transparent back surface is obtained.
Claims
1. A compound film of male and female faces, characterized in that: The yin-yang surface composite film is composed of a polyester surface layer (1), an ink layer (2), a first adhesive layer (3), a yin-yang effect layer (4), a second adhesive layer (5), a nylon barrier layer (6), a third adhesive layer (7) and a polyethylene heat-seal layer (8) from outside to inside. The lower end surface of the polyester surface layer (1) is gravure printed with the ink layer (2), the polyester surface layer (1) and the yin-yang effect layer (4) are adhered by the first adhesive layer (3), the yin-yang effect layer (4) and the nylon barrier layer (6) are adhered by the second adhesive layer (5), and the nylon barrier layer (6) and the polyethylene heat-seal layer (8) are adhered by the third adhesive layer (7). The yin-yang effect layer (4) is composed of an aluminum-plated polyester layer (4-1) and a polyester inner layer (4-2) spliced together, and the thickness of the aluminum-plated polyester layer (4-1) and the polyester inner layer (4-2) is 10-14 μm.
2. The compound film of claim 1, wherein: The polyester surface layer (1) is a biaxially stretched polyethylene terephthalate film with a thickness of 10-14 μm and an inner surface treated by corona discharge.
3. The compound film of claim 1, wherein: The ink layer (2) is a benzene-free and ketone-free high-temperature-resistant polyurethane gravure ink coating layer.
4. The compound film of claim 1, wherein: The first adhesive layer (3) is a two-component polyurethane adhesive layer specially used for aluminum plating.
5. The compound film of claim 1, wherein: The width ratio of the aluminum-plated polyester layer (4-1) to the polyester inner layer (4-2) is 4:3, and the width of the splicing joint (9) between the aluminum-plated polyester layer (4-1) and the polyester inner layer (4-2) is 0-0.5 mm.
6. The compound film of claim 1, wherein: The second adhesive layer (5) and the third adhesive layer (7) are both two-component dry polyurethane adhesive layers.
7. The compound film of claim 1, wherein: The nylon barrier layer (6) is a biaxially stretched nylon film with a thickness of 12-17 μm and double corona discharge.
8. The compound film of claim 1, wherein: The polyethylene heat-seal layer (8) is a three-layer co-extruded polyethylene film layer.
9. A self-standing bag of the outer and inner surface composite film of claim 1, which is resistant to water boiling plating aluminum on sauerkraut, characterized by: The self-standing bag is formed by folding and heat-sealing the yin-yang surface composite film, and the self-standing bag includes a bag body back surface (10), a bag body front surface (12), a bag body bottom surface (13), a bag body side edge heat-seal area (11-1) and a bag body bottom surface heat-seal area (11-2). The bag body front surface (12) and the bag body bottom surface (13) of the self-standing bag are both composed of the yin-yang surface composite film with the aluminum-plated polyester layer (4-1) part, the bag body back surface (10) of the self-standing bag is composed of the yin-yang surface composite film with the polyester inner layer (4-2) part, the left and right side edges of the self-standing bag are the bag body side edge heat-seal area (11-1), and the edge of the bag body bottom surface (13) is the bag body bottom surface heat-seal area (11-2).