CN108515725B - Compression-resistant buffer packaging bag and preparation method thereof - Google Patents
Compression-resistant buffer packaging bag and preparation method thereof Download PDFInfo
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- CN108515725B CN108515725B CN201810286913.2A CN201810286913A CN108515725B CN 108515725 B CN108515725 B CN 108515725B CN 201810286913 A CN201810286913 A CN 201810286913A CN 108515725 B CN108515725 B CN 108515725B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/74—Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/02—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents specially adapted to protect contents from mechanical damage
- B65D81/03—Wrappers or envelopes with shock-absorbing properties, e.g. bubble films
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Abstract
The invention relates to a compression-resistant buffer packaging bag and a preparation method thereof. The wrapping bag is formed by the complex film heat-seal, and the heat-seal district of wrapping bag is including the virtual district of sealing and the real district of sealing that arranges side by side, and virtual district heat-seal intensity of sealing is less than real district heat-seal intensity, when the wrapping bag aerifys outside environment atmospheric pressure and reduces after using the automatic peeling off of complex film in virtual district of sealing district with real district of sealing is arranged in proper order by the inboard outside of wrapping bag. The preparation method comprises the steps of firstly, co-extruding a composite layer, a middle layer and an inner layer material in a three-layer manner to obtain the D-PE blown film layer; then compounding, curing and cutting the D-PE blown film layer and the outer printing film layer by glue to form the composite film; and finally, thermally sealing the composite film by a thermal sealing block to form the packaging bag. The composite film obtained by the invention and the packaging bag prepared from the composite film can resist the action force of continuous environment pressure difference, and the bag explosion problem after the packaging bag is produced in a high-pressure area and sold in a low-pressure area is effectively avoided.
Description
Technical Field
The invention belongs to the field of packaging film materials, and particularly relates to a compression-resistant buffer packaging bag and a preparation method thereof.
Background
Plastic flexible packaging bags have recently been widely used due to their advantages of light weight, easy opening, low packaging cost, etc. When a plastic flexible package bag is used for packaging products, the plastic flexible package bag is generally divided into inflation positive pressure packaging, air-exhaust vacuum packaging and natural isobaric packaging. The air-filled positive pressure package is mainly characterized in that nitrogen is filled into a bag during packaging, and air which is easy to cause the deterioration of contents in the bag is replaced, so that the internal air pressure is greater than the external air pressure, and the packaging bag is bulged. Particularly, products packaged after being produced in a high-pressure area are sold in a low-pressure area, the internal and external pressure difference caused by the environmental pressure difference is larger, and the packaging bag bulges more obviously. In addition, when packaged products are packed into boxes, a squeezing force is also applied between the packaging bags or between the packaging bags and the outer box, so that the bags are promoted to bulge. The bulging of the bag can damage the material of the bag itself, most commonly by macroscopic breakage of the heat sealed areas of the bag under constant bag-bulging tension or microscopic passage of the contents inside and outside the bag, resulting in leakage or leakage of the contents. The inflatable positive pressure package also has the function of protecting fragile contents from being extruded in the package of the puffed food, so that the inflation quantity cannot be excessively reduced when the puffed food is produced in a high-air-pressure area, and the inflatable package product is popped up when sold in a low-air-pressure area. According to statistics of puffed food manufacturers, the bag explosion rate of the product and the product under different air pressure environments can reach more than 8 percent, and accounts for more than 90 percent of all defective products, and meanwhile, the problem of bag explosion can also bring food safety complaints that the content is polluted.
The material of constantly choosing higher heat-seal strength bears the negative pressure effort, if increase the thickness of heat-seal layer material, choose for use more layers of composite construction's membrane, the shortcoming is with too high costs, and the material is extravagant, retrieves the difficulty, and the effect is general, can not resist lasting pressure differential effort, still can explode bag problem product finally.
Disclosure of Invention
In order to solve the technical problems, the invention provides a compression-resistant buffer packaging bag and a preparation method thereof.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
the utility model provides a resistance to compression buffering wrapping bag, the wrapping bag is formed by the complex film heat-seal, the heat-seal district of wrapping bag is including the virtual district and the real district of sealing that arrange side by side, the virtual district of sealing is arranged in proper order to the outside by the wrapping bag inboard with real district of sealing, virtual district heat-seal strength is less than real district heat-seal strength, when the wrapping bag aerifys the reduction of outside environment atmospheric pressure after the use the virtual complex film of sealing the district is automatic to be peeled off.
Further, the composite film comprises an outer printing film layer and a D-PE (polyethylene) blown film layer, wherein the D-PE blown film layer comprises a composite layer, a middle layer and an inner layer, the thickness of the composite layer is 19-21 micrometers, the thickness of the middle layer is 22-28 micrometers, and the thickness of the inner layer is 3-5 micrometers; the composite layer comprises LLDPE, the middle layer comprises 35-45 wt% of LDPE, 25-35 wt% of LLDPE and 25-35 wt% of mLLDPE, and the inner layer comprises 80-90 wt% of mLLDPE and 10-20 wt% of polybutene-1.
Further, the outer printing film layer is BOPET, and the thickness of the outer printing film layer is 18-20 microns.
Further, the outer printing film layer is any one of BOPP, BOPA, paper and aluminum foil.
Further, the heat sealing strength of the virtual sealing area is controlled to be 5-10N/15 mm, and the heat sealing strength of the real sealing area is controlled to be more than 40N/15 mm.
Furthermore, the melt index of LLDPE in the composite layer is 2.2g/10min, and the density is 0.918g/cm3(ii) a The melt index of LDPE in the middle layer is 0.75g/10min, and the density is 0.923g/cm3(ii) a The melt index of LLDPE in the middle layer is 1g/10min, and the density is 0.922g/cm3(ii) a The melt index of mLLDPE in the middle layer is 0.85g/10min, and the density is 0.920g/cm3(ii) a The melt index of mLLDPE in the inner layer is 10g/10min, and the density is 0.910g/cm3(ii) a The melt index of the polybutene-1 in the inner layer is 0.4g/10min, and the density is 0.915g/cm3。
The preparation method of the pressure-resistant buffer packaging bag comprises the following steps:
step 1, preparing a D-PE blown film layer: respectively adding the composite layer, the middle layer and the inner layer material into an extruder to obtain the D-PE film blowing layer in a three-layer coextrusion mode;
step 2, preparing a composite membrane: compounding, curing and cutting the D-PE blown film layer and the outer printing film layer by glue to form the composite film;
step 3, heat-sealing the composite film to form a packaging bag: the packaging bag is formed by heat sealing the composite film through the heat sealing blocks, the heat sealing blocks comprise real-pressure heat sealing blocks and virtual-pressure heat sealing blocks which are arranged in parallel, the pressure of the real-pressure heat sealing blocks on the composite film is 3-5 kgf, and the pressure of the virtual-pressure heat sealing blocks on the composite film is 1-2 kgf.
Further, the wrapping bag heat-seal district includes along the first heat-seal section of wrapping bag side formation and follows the second heat-seal section that the wrapping bag tip formed, virtual seal position in first heat-seal section and/or second heat-seal section.
The invention has the beneficial effects that:
(1) when the packaging bag is used: the virtual sealing area is used as a buffer decompression area, when the inflatable package is produced in a high-pressure area, the inflatable package bag can be inflated to be expanded, the virtual sealing area is in a sealing state, when products are transported to a low-pressure area, the external air pressure of the package bag is reduced, the internal and external pressure difference of the package bag is increased, the package bag is continuously pulled, the virtual sealing area in the sealing state begins to be peeled, the peeling is only separated within 5 micrometers of the thickness of the inner layer of the D-PE film blowing layer, the internal volume of the package bag is increased, the comprehensive strength of the package bag material is not influenced, and the buffer decompression area is formed. The packaging bag with the increased inner volume enables the pressure difference between the inside and the outside to be obviously reduced, the pulling force of the pressure difference applied to the packaging bag is also obviously reduced, and the solid sealing area can not be damaged.
(2) The D-PE blown film layer is produced by a multilayer co-extrusion process, the formula is designed, the high-melting-point mLLDPE with the thickness of 3-5 microns on the heat sealing surface of the inner layer is blended with the low-strength polybutene-1, the sealing property is good when sealing is carried out at low pressure of 1-2 kgf, the sealing strength is not high and is generally 5-10N/15 mm, the packaging bag is in a sealing state when inflated, and the packaging bag is automatically separated from a virtual pressure area when continuously carrying out negative pressure or under the action of large pulling force, so that a buffer area with the increased volume in the bag is provided. When the heat sealing pressure is increased to 3-5 kgf, the inner layer of the D-PE blown film layer with the thickness of 3-5 microns is extruded to the edge of the heat sealing block by the high heat sealing pressure under the flowing of mLLDPE with high melting fingers, at the moment, the high-strength blended resin of the middle layer is subjected to heat sealing, the resin melting fingers of the layer are small, the heat sealing strength is high, and a solid sealing area of the packaging bag is formed.
(3) The size of the virtual sealing area required by the invention is designed according to the needs, the position can be designed in the first heat sealing section or the second heat sealing section of the packaging bag, and the sealing edges of the two heat sealing areas can also be designed. The invention correspondingly designs the heat sealing blocks according to the structure of the heat sealing area, wherein the heat sealing blocks comprise real pressure heat sealing blocks and virtual pressure heat sealing blocks which are arranged in parallel, namely a virtual pressure heat sealing block with small pressure is added at the edge of the real pressure heat sealing block with large pressure, and the virtual pressure heat sealing blocks can realize the small pressure heat sealing of the composite film by controlling or adjusting the contact surface gap through an independent cylinder to form the virtual sealing area with low heat sealing strength.
(4) The preparation method is simple, the obtained composite film and the packaging bag prepared from the composite film can resist the action force of continuous environment pressure difference, and the problem of bag explosion after the packaging bag is produced in a high-pressure area and sold in a low-pressure area is effectively avoided.
Drawings
FIG. 1 is a schematic view of a composite membrane structure according to the present invention.
Fig. 2 is a schematic view of a manufacturing process of the packaging bag according to the present invention.
Fig. 3 is a schematic view of the structure of the packing bag of the present invention.
FIG. 4 is a graph showing the heat-seal strength curves of the solid seal area and the virtual seal area of the packaging bag of the present invention at the same heat-seal temperature and different heat-seal pressures.
Fig. 5 is a schematic view of the structure of a heat seal block for heat sealing the first heat seal land.
Fig. 6 is a schematic view of the structure of the heat seal block for heat-sealing the second heat-seal land.
FIG. 7 is a schematic view of a roller heat seal block for heat sealing a first heat seal land.
The designations in the drawings have the following meanings:
a-virtual sealing area B-solid sealing area 11-composite layer 12-intermediate layer 13-inner layer
20-outer printing film layer 30-ink layer 40-glue layer
50-full pressure heat seal block 60-virtual pressure heat seal block
Detailed Description
The technical scheme of the invention is more specifically explained by combining the following embodiments:
the sources of the raw materials used in the examples are shown in table 1 below:
example 1
The preparation method of the compression-resistant buffer packaging bag comprises the following steps:
step 1, preparing a D-PE blown film layer: respectively adding the composite layer, the middle layer and the inner layer material into an extruder to obtain the D-PE film blowing layer in a three-layer coextrusion mode; the composite layer comprises 100 wt% LLDPE, the middle layer comprises 40 wt% LDPE, 30 wt% LLDPE and 30 wt% mLLDPE, and the inner layer comprises 85 wt% mLLDPE and 15 wt% polybutene-1. The thickness distribution of the D-PE blown film layer is as follows: the composite layer thickness is 20 microns, the middle layer thickness is 25 microns, and the inner layer thickness is 5 microns.
The preparation process parameters of the D-PE blown film layer in the step 1 are shown in the following table 2:
step 2, preparing a composite membrane: compounding, curing and cutting the D-PE blown film layer and the outer printing film layer by glue to form the composite film; the outer printing film layer is BOPET (biaxially oriented polyester film) and has a thickness of 19 microns.
Step 3, heat-sealing the composite film to form a packaging bag: the packaging bag is formed by heat sealing the composite film through the heat sealing blocks, the heat sealing blocks comprise real-pressure heat sealing blocks and virtual-pressure heat sealing blocks which are arranged in parallel, the real-pressure heat sealing blocks are applied to the composite film, the pressure on the composite film is 4kgf, and the virtual-pressure heat sealing blocks are applied to the composite film, wherein the pressure on the composite film is 2 kgf. The wrapping bag heat-seal district includes along the first heat-seal section of wrapping bag side formation and follows the second heat-seal section that the wrapping bag tip formed, the virtual district that seals is in these two sealed limits of first heat-seal section and second heat-seal section all design.
The detection results of the key performance of the packaging bag are shown in the following table 3:
from the data in table 3 above, it can be seen that: the performance of the packaging bag prepared in example 1 of the present invention was superior to the comparative bag.
The negative pressure resistance test results of the packaging bag are shown in the following table 4:
as can be seen from the test results in Table 4 above: after the packaging bag is inflated, when the pressure of a test environment is continuously reduced, namely the negative pressure is continuously increased, the bag explosion phenomenon is generated when the negative pressure of the comparison bag is 0.06MPa, but the bag explosion phenomenon is still not generated when the negative pressure of the packaging bag is increased to 0.08MPa, so that the packaging bag has better negative pressure resistance.
Example 2
The preparation method of the compression-resistant buffer packaging bag comprises the following steps:
step 1, preparing a D-PE blown film layer: respectively adding the composite layer, the middle layer and the inner layer material into an extruder to obtain the D-PE film blowing layer in a three-layer coextrusion mode; the composite layer comprises 100 wt% LLDPE, the middle layer comprises 35 wt% LDPE, 35 wt% LLDPE and 30 wt% mLLDPE, and the inner layer comprises 80 wt% mLLDPE and 20 wt% polybutene-1. The thickness distribution of the D-PE blown film layer is as follows: the thickness of the composite layer is 19 microns, the thickness of the middle layer is 22 microns, and the thickness of the inner layer is 4 microns. The preparation process parameters of the D-PE blown film layer in the step 1 are the same as those of the embodiment 1.
Step 2, preparing a composite membrane: compounding, curing and cutting the D-PE blown film layer and the outer printing film layer by glue to form the composite film; the outer printing film layer is BOPET and 18 microns in thickness.
Step 3, heat-sealing the composite film to form a packaging bag: the composite film is heat-sealed and formed into the packaging bag through the heat sealing blocks, the heat sealing blocks comprise real-pressure heat sealing blocks and virtual-pressure heat sealing blocks which are arranged in parallel, the real-pressure heat sealing blocks are applied to the composite film, the pressure on the composite film is 3kgf, and the virtual-pressure heat sealing blocks are applied to the composite film, wherein the pressure on the composite film is 1 kgf. The wrapping bag heat-seal district includes along the first heat-seal section of wrapping bag side formation and follows the second heat-seal section that the wrapping bag tip formed, the virtual district that seals is in first heat-seal section design.
Example 3
The preparation method of the compression-resistant buffer packaging bag comprises the following steps:
step 1, preparing a D-PE blown film layer: respectively adding the composite layer, the middle layer and the inner layer material into an extruder to obtain the D-PE film blowing layer in a three-layer coextrusion mode; the composite layer comprises 100 wt% LLDPE, the middle layer comprises 45 wt% LDPE, 25 wt% LLDPE and 30 wt% mLLDPE, and the inner layer comprises 90 wt% mLLDPE and 10 wt% polybutene-1. The thickness distribution of the D-PE blown film layer is as follows: the thickness of the composite layer is 21 microns, the thickness of the middle layer is 28 microns, and the thickness of the inner layer is 3 microns. The preparation process parameters of the D-PE blown film layer in the step 1 are the same as those of the embodiment 1.
Step 2, preparing a composite membrane: compounding, curing and cutting the D-PE blown film layer and the outer printing film layer by glue to form the composite film; the outer printing film layer is BOPET and has a thickness of 20 microns.
Step 3, heat-sealing the composite film to form a packaging bag: the packaging bag is formed by heat sealing the composite film through the heat sealing blocks, the heat sealing blocks comprise real-pressure heat sealing blocks and virtual-pressure heat sealing blocks which are arranged in parallel, the real-pressure heat sealing blocks are applied to the composite film, the pressure on the composite film is 5kgf, and the virtual-pressure heat sealing blocks are applied to the composite film, wherein the pressure on the composite film is 2 kgf. The wrapping bag heat-seal district includes along the first heat-seal section of wrapping bag side formation and edge the second heat-seal section that the wrapping bag tip formed, the virtual district that seals is in the design of second heat-seal section.
Example 4
The preparation method of the compression-resistant buffer packaging bag comprises the following steps:
step 1, preparing a D-PE blown film layer: respectively adding the composite layer, the middle layer and the inner layer material into an extruder to obtain the D-PE film blowing layer in a three-layer coextrusion mode; the composite layer comprises 100 wt% LLDPE, the middle layer comprises 40 wt% LDPE, 35 wt% LLDPE and 25 wt% mLLDPE, and the inner layer comprises 85 wt% mLLDPE and 15 wt% polybutene-1. The thickness distribution of the D-PE blown film layer is as follows: the composite layer thickness is 20 microns, the middle layer thickness is 25 microns, and the inner layer thickness is 5 microns. The preparation process parameters of the D-PE blown film layer in the step 1 are the same as those of the embodiment 1.
Step 2, preparing a composite membrane: compounding, curing and cutting the D-PE blown film layer and the outer printing film layer by glue to form the composite film; the outer printing film layer is BOPET and 19 microns in thickness.
Step 3, heat-sealing the composite film to form a packaging bag: the packaging bag is formed by heat sealing the composite film through the heat sealing blocks, the heat sealing blocks comprise real-pressure heat sealing blocks and virtual-pressure heat sealing blocks which are arranged in parallel, the real-pressure heat sealing blocks are applied to the composite film, the pressure on the composite film is 4kgf, and the virtual-pressure heat sealing blocks are applied to the composite film, wherein the pressure on the composite film is 2 kgf. The wrapping bag heat-seal district includes along the first heat-seal section of wrapping bag side formation and edge the second heat-seal section that the wrapping bag tip formed, the virtual district that seals is in the design of second heat-seal section.
Example 5
The preparation method of the compression-resistant buffer packaging bag comprises the following steps:
step 1, preparing a D-PE blown film layer: respectively adding the composite layer, the middle layer and the inner layer material into an extruder to obtain the D-PE film blowing layer in a three-layer coextrusion mode; the composite layer comprises 100 wt% LLDPE, the middle layer comprises 35 wt% LDPE, 30 wt% LLDPE and 35 wt% mLLDPE, and the inner layer comprises 85 wt% mLLDPE and 15 wt% polybutene-1. The thickness distribution of the D-PE blown film layer is as follows: the composite layer thickness is 20 microns, the middle layer thickness is 25 microns, and the inner layer thickness is 5 microns. The preparation process parameters of the D-PE blown film layer in the step 1 are the same as those of the embodiment 1.
Step 2, preparing a composite membrane: compounding, curing and cutting the D-PE blown film layer and the outer printing film layer by glue to form the composite film; the outer printing film layer is BOPET and 19 microns in thickness.
Step 3, heat-sealing the composite film to form a packaging bag: the packaging bag is formed by heat sealing the composite film through the heat sealing blocks, the heat sealing blocks comprise real-pressure heat sealing blocks and virtual-pressure heat sealing blocks which are arranged in parallel, the real-pressure heat sealing blocks are applied to the composite film, the pressure on the composite film is 4kgf, and the virtual-pressure heat sealing blocks are applied to the composite film, wherein the pressure on the composite film is 2 kgf. The wrapping bag heat-seal district includes along the first heat-seal section of wrapping bag side formation and edge the second heat-seal section that the wrapping bag tip formed, the virtual district that seals is in the design of second heat-seal section.
The packaging bags produced in the above examples 2 to 5 were also tested to show more excellent properties such as tensile strength, elongation and heat seal strength than the comparative bags. Meanwhile, the packaging bags produced in the embodiments 2-5 also have better negative pressure resistance compared with the comparison bags.
Claims (7)
1. The utility model provides a resistance to compression buffering wrapping bag, the wrapping bag is formed by the heat-seal of complex film, its characterized in that: the heat-seal area of the packaging bag comprises a virtual seal area (A) and a real seal area (B) which are arranged in parallel, the virtual seal area (A) and the real seal area (B) are sequentially arranged from the inner side to the outer side of the packaging bag, the heat-seal strength of the virtual seal area (A) is lower than that of the real seal area (B), and the composite film of the virtual seal area (A) is automatically peeled off when the atmospheric pressure of the outer side environment is reduced after the packaging bag is inflated for use;
the composite film comprises an outer printing film layer (20) and a D-PE (polyethylene) blown film layer, wherein the D-PE blown film layer comprises a composite layer (11), an intermediate layer (12) and an inner layer (13), the thickness of the composite layer (11) is 19-21 micrometers, the thickness of the intermediate layer (12) is 22-28 micrometers, and the thickness of the inner layer (13) is 3-5 micrometers; the composite layer (11) comprises LLDPE, the middle layer (12) comprises 35-45 wt% of LDPE, 25-35 wt% of LLDPE and 25-35 wt% of mLLDPE, and the inner layer (13) comprises 80-90 wt% of mLLDPE and 10-20 wt% of polybutene-1.
2. The crush-resistant cushioning packaging bag of claim 1, wherein: the outer printing film layer (20) is BOPET, and the thickness of the outer printing film layer (20) is 18-20 microns.
3. The crush-resistant cushioning packaging bag of claim 1, wherein: the outer printing film layer (20) is any one of BOPP, BOPA, paper and aluminum foil.
4. The crush-resistant cushioning packaging bag of claim 1, wherein: the heat sealing strength of the virtual sealing area (A) is controlled to be 5-10N/15 mm, and the heat sealing strength of the real sealing area (B) is controlled to be more than 40N/15 mm.
5. The crush-resistant cushioning packaging bag of claim 1, wherein: the melt index of LLDPE in the composite layer (11) is 2.2g/10min, and the density is 0.918g/cm3(ii) a The melt index of LDPE in the intermediate layer (12) is 0.75g/10min, and the density is 0.923g/cm3(ii) a The melt index of LLDPE in the intermediate layer (12) is 1g/10min, and the density is 0.922g/cm3(ii) a The melt index of mLLDPE in the intermediate layer (12) is 0.85g/10min, and the density is 0.920g/cm3(ii) a The melt index of mLLDPE in the inner layer (13) is 10g/10min, and the density is 0.910g/cm3(ii) a The melt index of the polybutene-1 in the inner layer (13) is 0.4g/10min, and the density is 0.915g/cm3。
6. The method for preparing the pressure-resistant buffer packaging bag according to any one of claims 1 to 5, wherein: the method comprises the following steps:
step 1, preparing a D-PE blown film layer: respectively adding the materials of the composite layer (11), the middle layer (12) and the inner layer (13) into an extruder to obtain the D-PE blown film layer in a three-layer coextrusion mode;
step 2, preparing a composite membrane: compounding, curing and cutting the D-PE blown film layer and the outer printing film layer (20) by glue to form the composite film;
step 3, heat-sealing the composite film to form a packaging bag: the packaging bag is formed by heat sealing the composite film through the heat sealing blocks, the heat sealing blocks comprise real-pressure heat sealing blocks (50) and virtual-pressure heat sealing blocks (60) which are arranged in parallel, the real-pressure heat sealing blocks (50) are applied to the composite film, the pressure on the composite film is 3-5 kgf, and the virtual-pressure heat sealing blocks (60) are applied to the composite film, wherein the pressure on the composite film is 1-2 kgf.
7. The method for preparing a crush-resistant buffer packing bag according to claim 6, wherein: the wrapping bag heat-seal district includes along the first heat-seal section of wrapping bag side formation and follows the second heat-seal section that the wrapping bag tip formed, virtual district (A) that seals is located first heat-seal section and/or second heat-seal section.
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| CN113427875A (en) * | 2021-07-09 | 2021-09-24 | 云南名博包装印刷有限公司 | Composite film with three-dimensional effect and manufacturing process thereof |
| CN117429128B (en) * | 2023-12-20 | 2024-03-12 | 杭州神彩包装印业有限公司 | Self-moisture-absorbing packaging bag and manufacturing process thereof |
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2018
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