CN117962439A - Full PP eight-edge coffee bag and preparation thereof - Google Patents
Full PP eight-edge coffee bag and preparation thereof Download PDFInfo
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- CN117962439A CN117962439A CN202410206634.6A CN202410206634A CN117962439A CN 117962439 A CN117962439 A CN 117962439A CN 202410206634 A CN202410206634 A CN 202410206634A CN 117962439 A CN117962439 A CN 117962439A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000004743 Polypropylene Substances 0.000 claims abstract description 77
- -1 polypropylene Polymers 0.000 claims abstract description 42
- 229920001155 polypropylene Polymers 0.000 claims abstract description 42
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 40
- 229920006378 biaxially oriented polypropylene Polymers 0.000 claims abstract description 36
- 239000011127 biaxially oriented polypropylene Substances 0.000 claims abstract description 36
- 238000007789 sealing Methods 0.000 claims abstract description 30
- 239000010410 layer Substances 0.000 claims abstract description 27
- 239000002131 composite material Substances 0.000 claims abstract description 16
- 229920006132 styrene block copolymer Polymers 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000013329 compounding Methods 0.000 claims abstract description 9
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 9
- 210000000056 organ Anatomy 0.000 claims abstract description 9
- 238000007639 printing Methods 0.000 claims abstract description 7
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 238000007493 shaping process Methods 0.000 claims abstract description 6
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000003292 glue Substances 0.000 claims abstract description 4
- 238000007711 solidification Methods 0.000 claims abstract description 4
- 230000008023 solidification Effects 0.000 claims abstract description 4
- 229920005676 ethylene-propylene block copolymer Polymers 0.000 claims description 8
- 229920005674 ethylene-propylene random copolymer Polymers 0.000 claims description 8
- 239000000463 material Substances 0.000 description 15
- 239000004698 Polyethylene Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000004209 oxidized polyethylene wax Substances 0.000 description 5
- 235000013873 oxidized polyethylene wax Nutrition 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000010409 ironing Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Chemical class CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical class CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical class CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 1
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000012748 slip agent Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention provides a full PP eight-edge coffee bag and a preparation method thereof. The method comprises the following steps: s1, providing a biaxially oriented polypropylene film and a polypropylene film, wherein the biaxially oriented polypropylene film is formed by mixing, extruding, biaxially oriented, cooling and shaping, cutting and printing 25-35 parts by weight of polypropylene, 65-75 parts by weight of propylene-styrene block copolymer, 0.5-2 parts by weight of slipping agent and 1-5 parts by weight of opening agent; the polypropylene film is formed by a corona layer, an intermediate layer and a heat sealing layer through extrusion, solidification, cooling and corona procedures; s2, compounding the biaxially oriented polypropylene film and the polypropylene film through glue to form a composite film; s3, making the composite film into bags, and then heat-sealing the bags by using an organ hot air knife.
Description
Technical Field
The invention relates to a full PP eight-edge coffee bag and a preparation method thereof.
Background
The plastic products bring convenience to life of people and also cause long-term harm to the environment. Because plastics are not easy to decompose, if the plastics are not recycled, the plastics waste becomes pollutants in the environment to be permanently stored and accumulated, and the environment is greatly damaged. Most of the existing eight-edge sealing packaging products are of multi-layer different plastic composite structures, the product performance is good, the material structure is complex, and the recycling can not be performed; in order to ensure the product performance and the production convenience, the product structure is mainly a PET, aluminum foil and aluminum plating structure, and the normal production of the material in the existing equipment is convenient.
Most of the existing eight-edge sealing bag products are of structures such as PET/AL/PE, PET/VMPET/PE and PET/PE, the production process of the structures is simple, too many pretreatment processes are not needed for materials, but the recycling is very difficult, the products cannot be effectively separated, and the eight-edge sealing bag products can be abandoned finally, so that a long-term pollution is caused to the environment. BOPP/CPP composite film is a new material which can be recovered without separation, and is hopefully used in eight-sided envelope products, but BOPP in the existing BOPP/CPP composite film is poor in temperature resistance compared with PET, and a high-temperature ironing knife in the bag making process can damage BOPP material, so that the BOPP material has the problem of sticking the knife, and the air tightness is unqualified when the temperature is reduced.
Disclosure of Invention
The invention provides a full PP eight-edge coffee bag and a preparation method thereof, which can effectively solve the problems.
The invention is realized in the following way:
The invention provides a full PP eight-edge coffee bag, which is formed by compounding a biaxially oriented polypropylene film and a polypropylene film, wherein the polypropylene film consists of a corona layer, an intermediate layer and a heat sealing layer, and the biaxially oriented polypropylene film consists of 25-35 parts by weight of polypropylene, 65-75 parts by weight of propylene-styrene block copolymer, 0.5-2 parts by weight of slipping agent and 1-5 parts by weight of opening agent.
The invention further provides a preparation method of the full PP eight-edge coffee bag, which comprises the following steps: s1, providing a biaxially oriented polypropylene film and a polypropylene film, wherein the biaxially oriented polypropylene film is formed by mixing, extruding, biaxially oriented, cooling and shaping, cutting and printing 25-35 parts by weight of polypropylene, 65-75 parts by weight of propylene-styrene block copolymer, 0.5-2 parts by weight of slipping agent and 1-5 parts by weight of opening agent; the polypropylene film is formed by a corona layer, an intermediate layer and a heat sealing layer through extrusion, solidification, cooling and corona procedures;
s2, compounding the biaxially oriented polypropylene film and the polypropylene film through glue to form a composite film;
S3, making the composite film into bags, and then heat-sealing the bags by using an organ hot air knife.
The beneficial effects of the invention are as follows: the invention can solve the technical problems that the biaxially oriented polypropylene film is easy to be damaged and the cutter is stuck by improving the biaxially oriented polypropylene film (printing layer). Furthermore, the full PP eight-edge coffee bag provided by the invention can replace the eight-edge coffee bag products with the structures of PET/AL/PE, PET/VMPET/PE, PET/PE and the like, so that the technical problem that the existing eight-edge coffee bag products can be recycled only by effective separation or cannot be recycled is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a preparation method of a full PP eight-edge sealed coffee bag provided by an embodiment of the present invention.
Fig. 2 and 3 are photographs of a full PP eight-sealed coffee bag provided by an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Referring to the buttons shown in fig. 2-3, the present invention provides a full PP eight-edge coffee bag, comprising: the biaxially oriented polypropylene film is formed by compounding a biaxially oriented polypropylene film and a polypropylene film, wherein the polypropylene film is composed of a corona layer, an intermediate layer and a heat sealing layer, and the biaxially oriented polypropylene film is composed of 25-35 parts by weight of polypropylene, 65-75 parts by weight of propylene-styrene block copolymer, 0.5-2 parts by weight of slipping agent and 1-5 parts by weight of opening agent. Wherein, the model of the polypropylene can be F1002. The propylene-styrene block copolymer may be of the type SEPTON 8004. The slipping agent may be oxidized polyethylene wax, oxidized polyethylene wax slurry, oxidized polyethylene wax, silicone master batch, polyolefin wax, etc., or other kinds of slipping agents, without limitation. The opening agent mainly comprises minerals and organic matters, wherein the minerals opening agent comprises talcum powder, diatomite and the like, and the organic matters opening agent comprises oleamide, erucamide, EBS derivatives and the like; the addition amount of these opening agents can be selected according to the actual needs and uses, for improving the opening property and anti-blocking property of the film.
In the prior art, BOPP films generally consist of polypropylene and a certain amount of slipping agent, but the BOPP materials can be damaged by a hot knife in the bag making process, so that the BOPP films have the problem of sticking the knife, and the air tightness is unqualified when the temperature is reduced. The propylene-styrene block copolymer is creatively added (namely, part of polypropylene is replaced by the propylene-styrene block copolymer), so that the problem that a BOPP material is damaged by a high-temperature ironing knife in the bag making process can be solved. Preferably, the biaxially oriented polypropylene film consists of 28 to 32 parts by weight of polypropylene, 68 to 72 parts by weight of propylene-styrene block copolymer, 0.8 to 1.5 parts by weight of slipping agent and 2 to 3 parts by weight of opening agent. In one embodiment, more preferably, the biaxially oriented polypropylene film is composed of 30 parts by weight of polypropylene, 71 parts by weight of propylene-styrene block copolymer, 1.2 parts by weight of a slipping agent, and 2.5 parts by weight of an opening agent.
As a further improvement, the present invention further improves the polypropylene film in order to enhance the heat sealing effect of the composite film. This is because the seal at the overlapped position of the organ is the worst in the heat-sealing process, so that the air tightness of the product does not reach the standard. The solution to this problem can be achieved by increasing the bagging temperature and pressure, or by decreasing the heat sealing temperature, but this increase in temperature breaks the BOPP surface, causing the film surface to become tacky and broken. Therefore, this can only be achieved by lowering the heat-sealing temperature of the film.
As a further improvement, in order to reduce the temperature of the heat-seal layer, the embodiments of the present invention further improve the material of the heat-seal layer. Specifically, the heat sealing layer consists of 65-75 parts by weight of styrene-ethylene-propylene block copolymer, 25-35 parts by weight of ethylene-propylene random copolymer, 1-5 parts by weight of metallocene PP, 2-5 parts by weight of slipping agent and 1-5 parts by weight of opening agent. The model of the styrene-ethylene-propylene block copolymer is SEPTON 1020; the ethylene-propylene random copolymer is Exxon Mobil APP-199, 299, 399 and the like. The metallocene PP may be MU4016 of the petaloid. The heat sealing temperature in the existing CPP generally reaches 170 ℃ or even more than 180 ℃, but the heat sealing temperature of the CPP can be obviously reduced to about 150-60 ℃ by adding the metallocene PP, and the CPP has good heat sealing strength, and the heat sealing strength at 150 ℃ can reach more than 50N. Preferably, the heat sealing layer consists of 68-72 parts by weight of styrene-ethylene-propylene block copolymer, 28-32 parts by weight of ethylene-propylene random copolymer, 3-4 parts by weight of metallocene PP, 3-4 parts by weight of slipping agent and 2-3 parts by weight of opening agent. In one embodiment, the heat seal layer is composed of 70 parts by weight of a styrene-ethylene-propylene block copolymer, 30 parts by weight of an ethylene-propylene random copolymer, 3 parts by weight of metallocene PP,4 parts by weight of a slip agent, and 2 parts by weight of an opening agent. The corona layer can use the existing filling type polypropylene resin, such as F800EDF, R140M, FC-150B, HF4008, F703 polypropylene resin and the like; the material of the intermediate layer can be FC801, HF400, HF420, FC-150J, and the like. Experiments prove that when the addition amount of the metallocene PP reaches about 3wt%, the heat sealing strength of the material reaches a limit value, and when the addition of the metallocene PP is continued, the heat sealing strength of the material does not change significantly.
Referring to fig. 1, the embodiment of the invention further provides a method for preparing a full PP eight-edge sealed coffee bag, which comprises the following steps:
S1, providing a biaxially oriented polypropylene film and a polypropylene film, wherein the biaxially oriented polypropylene film is formed by mixing, extruding, biaxially oriented, cooling and shaping, cutting and printing 25-35 parts by weight of polypropylene, 65-75 parts by weight of propylene-styrene block copolymer, 0.5-2 parts by weight of slipping agent and 1-5 parts by weight of opening agent; the polypropylene film is formed by a corona layer, an intermediate layer and a heat sealing layer through extrusion, solidification, cooling and corona procedures;
s2, compounding the biaxially oriented polypropylene film and the polypropylene film through glue to form a composite film;
S3, making the composite film into bags, and then heat-sealing the bags by using an organ hot air knife.
In step S1, the extrusion, biaxial stretching, cooling and shaping, cutting, printing, curing, cooling and corona are all prior art and will not be described here.
In step S3, the parameters of the heat sealing with the organ hot air knife are as follows: the heat sealing temperature is 150-170 ℃, the pressure is 0.35-0.45MPa, and the heat sealing time is 0.1-1s. More preferably, the parameters of the heat sealing with the organ hot air knife are as follows: 155-165 deg.c, pressure of 0.38-0.42MPa and heat sealing time of 0.3-1s. In other embodiments, the heat seal temperature is 150 ℃, 152 ℃, 155 ℃, 158 ℃, 160 ℃, 162 ℃, 165 ℃, 168 ℃, 170 ℃, respectively.
Example 1:
Mixing, extruding, biaxially stretching, cooling and shaping 30 parts by weight of F1002 polypropylene, 71 parts by weight of SEPTON propylene-styrene block copolymer, 1.2 parts by weight of oxidized polyethylene wax and 2.5 parts by weight of talcum powder, and cutting and printing to form a biaxially stretched polypropylene film, wherein the thickness of the biaxially stretched polypropylene film is about 20 microns;
Extruding, solidifying, cooling and corona forming a polypropylene film by using 70 parts by weight of SEPTON 1020 styrene-ethylene-propylene block copolymer, 30 parts by weight of APP-199 ethylene-propylene random copolymer, 3 parts by weight of MU4016 metallocene PP,4 parts by weight of oxidized polyethylene wax, 2 parts by weight of a heat sealing layer formed by talcum powder, an FC801 material middle layer and an F800EDF material corona layer, wherein the thickness of the polypropylene film is about 40 microns;
And compounding the biaxially oriented polypropylene film and the polypropylene film through an inorganic adhesive and a compounding machine to form a composite film, and finally, carrying out heat sealing on the composite film by using an organ hot air knife after making bags, and carrying out heat sealing strength test.
Test example 1: the final composite films were tested for tensile strength, breaking strength and tear strength according to the GB13022 and QB/T1130 standards, respectively, as follows: wherein, the transverse tensile strength of the composite film is 340Mpa, and the longitudinal tensile strength is 460Mpa: elongation at break in transverse direction: transverse 110% and longitudinal elongation at break 85%; tear strength: the transverse tear strength is 145N/mm and the longitudinal tear strength is 215N/mm.
Test example 2: and on the heat seal strength tester, carrying out heat seal on the full PP eight-edge sealing coffee bag, then stretching to fracture at a certain speed, recording the maximum force in the stretching process, and calculating the heat seal strength. The heat seal strength was measured in newtons (N), and in the heat seal test, each temperature was tested 3 times in parallel, and the average value was taken as shown in table 1, and whether the surface of the bag body was scalded by a scalding knife was observed by naked eyes.
Table 1 is a test data record table of the examples
As can be seen from Table 1, the heat seal strength can reach 50.5N as the temperature increases to 150 ℃. As the temperature continues to increase, the heat seal strength of the heat seal reaches about 58.0N peak value, and when the temperature continues to increase, the heat seal strength of the heat seal is not obviously increased. Further, as the temperature reached about 170 ℃, slight defects of scalding by the scalding knife began to appear on the surface of the bag body.
Test example 3: finally, the products with heat sealing temperature of 150 ℃, 160 ℃ and 170 ℃ are subjected to drop test (100 g 1.5 m), and the products are dropped for 3 times without breaking bags, so that the requirements of customers are satisfied, and the data are shown in table 2.
Table 2 is a drop test data table of example 1
| Heat sealing temperature (DEG C) | Whether or not to pass |
| 150 | NO (1) |
| 155 | Is that |
| 160 | Is that |
| 165 | Is that |
| 170 | Is that |
From Table 2 above, it can be seen that the heat seal strength at 150℃is slightly insufficient, and 1 bag break is observed in 4 drop tests, and the heat seal temperature of 155℃or more can fully satisfy the requirements.
Single factor experiment-example 2:
Substantially the same as in example 1, except that the parts of MU4016 metallocene PP content were adjusted to 1 part, 2 parts, 4 parts and 5 parts, respectively, and were respectively bagged and heat-seal strength tested at 160 ℃ as shown in table 3.
Table 3 is a table of heat seal strength data for different metallocene PP contents
It can be seen from table 3 that the addition of the metallocene PP forms a good synergistic effect with other materials, so that the heat seal strength can be significantly improved, but the effect reaches the limit value without significant change as the addition amount reaches 5 parts.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A full PP octagon coffee bag, comprising: the polypropylene film is formed by compounding a biaxially oriented polypropylene film and a polypropylene film, wherein the polypropylene film consists of a corona layer, a middle layer and a heat seal layer, and is characterized in that: the biaxially oriented polypropylene film consists of 25-35 parts by weight of polypropylene, 65-75 parts by weight of propylene-styrene block copolymer, 0.5-2 parts by weight of slipping agent and 1-5 parts by weight of opening agent.
2. The full PP eight-edge sealed coffee bag of claim 1, wherein the biaxially oriented polypropylene film is composed of 28 to 32 parts by weight of polypropylene, 68 to 72 parts by weight of propylene-styrene block copolymer, 0.8 to 1.5 parts by weight of a slipping agent, and 2 to 3 parts by weight of an opening agent.
3. The full PP eight-seal coffee bag of claim 2, wherein the biaxially oriented polypropylene film is composed of 30 parts by weight of polypropylene, 71 parts by weight of propylene-styrene block copolymer, 1.2 parts by weight of a slipping agent, 2.5 parts by weight of an opening agent.
4. The full PP eight-seal coffee bag of claim 1, wherein the heat-seal layer is composed of 65 to 75 parts by weight of a styrene-ethylene-propylene block copolymer, 25 to 35 parts by weight of an ethylene-propylene random copolymer, 1 to 5 parts by weight of a metallocene PP,2 to 5 parts by weight of a slipping agent, and 1 to 5 parts by weight of an opening agent.
5. The full PP eight-seal coffee bag of claim 4, wherein the heat-seal layer is composed of 68 to 72 parts by weight of styrene-ethylene-propylene block copolymer, 28 to 32 parts by weight of ethylene-propylene random copolymer, 3 to 4 parts by weight of metallocene PP,3 to 4 parts by weight of slipping agent, and 2 to 3 parts by weight of opening agent.
6. The all PP eight-seal coffee bag of claim 5, wherein the heat-seal layer is composed of 70 parts by weight of a styrene-ethylene-propylene block copolymer, 30 parts by weight of an ethylene-propylene random copolymer, 3 parts by weight of metallocene PP,4 parts by weight of a slipping agent, 2 parts by weight of an opening agent.
7. The preparation method of the full PP eight-edge coffee bag is characterized by comprising the following steps of:
S1, providing a biaxially oriented polypropylene film and a polypropylene film, wherein the biaxially oriented polypropylene film is formed by mixing, extruding, biaxially oriented, cooling and shaping, cutting and printing 25-35 parts by weight of polypropylene, 65-75 parts by weight of propylene-styrene block copolymer, 0.5-2 parts by weight of slipping agent and 1-5 parts by weight of opening agent; the polypropylene film is formed by a corona layer, an intermediate layer and a heat sealing layer through extrusion, solidification, cooling and corona procedures;
s2, compounding the biaxially oriented polypropylene film and the polypropylene film through glue to form a composite film;
S3, making the composite film into bags, and then heat-sealing the bags by using an organ hot air knife.
8. The method for preparing the full PP eight-edge sealed coffee bag of claim 7, wherein the parameters of the heat sealing with the organ hot air knife are as follows: the temperature is 150-170 ℃, the pressure is 0.35-0.45MPa, and the heat sealing time is 0.1-1s.
9. The method for preparing the full PP eight-edge sealed coffee bag of claim 8, wherein the temperature is 155-165 ℃, the pressure is 0.38-0.42MPa, and the heat sealing time is 0.3-1s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410206634.6A CN117962439A (en) | 2024-02-26 | 2024-02-26 | Full PP eight-edge coffee bag and preparation thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410206634.6A CN117962439A (en) | 2024-02-26 | 2024-02-26 | Full PP eight-edge coffee bag and preparation thereof |
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| CN117962439A true CN117962439A (en) | 2024-05-03 |
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|---|---|---|---|
| CN202410206634.6A Pending CN117962439A (en) | 2024-02-26 | 2024-02-26 | Full PP eight-edge coffee bag and preparation thereof |
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