CN104354415B - A kind of puncture-resistant oil resistivity heat-sealing compound counterdie and preparation method thereof - Google Patents
A kind of puncture-resistant oil resistivity heat-sealing compound counterdie and preparation method thereof Download PDFInfo
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- CN104354415B CN104354415B CN201410647857.2A CN201410647857A CN104354415B CN 104354415 B CN104354415 B CN 104354415B CN 201410647857 A CN201410647857 A CN 201410647857A CN 104354415 B CN104354415 B CN 104354415B
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- 238000007789 sealing Methods 0.000 title claims abstract description 57
- 150000001875 compounds Chemical class 0.000 title claims abstract description 9
- 238000002360 preparation method Methods 0.000 title claims description 13
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 48
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 48
- -1 polypropylene Polymers 0.000 claims abstract description 26
- 239000000806 elastomer Substances 0.000 claims abstract description 18
- 229920001971 elastomer Polymers 0.000 claims abstract description 18
- 239000004743 Polypropylene Substances 0.000 claims abstract description 16
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 16
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 16
- 229920001155 polypropylene Polymers 0.000 claims abstract description 16
- 238000010096 film blowing Methods 0.000 claims abstract description 14
- 229920001179 medium density polyethylene Polymers 0.000 claims abstract description 7
- 239000004701 medium-density polyethylene Substances 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 110
- 239000002131 composite material Substances 0.000 claims description 63
- 239000000463 material Substances 0.000 claims description 38
- 239000002994 raw material Substances 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 24
- 238000001125 extrusion Methods 0.000 claims description 17
- 239000000155 melt Substances 0.000 claims description 11
- 239000012792 core layer Substances 0.000 claims description 8
- 229920006280 packaging film Polymers 0.000 claims description 8
- 239000012785 packaging film Substances 0.000 claims description 8
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 239000004519 grease Substances 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000011347 resin Substances 0.000 description 27
- 229920005989 resin Polymers 0.000 description 27
- 239000004698 Polyethylene Substances 0.000 description 10
- 229920000573 polyethylene Polymers 0.000 description 10
- 238000002156 mixing Methods 0.000 description 9
- 238000000071 blow moulding Methods 0.000 description 6
- 238000013329 compounding Methods 0.000 description 6
- 235000013305 food Nutrition 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 229920000092 linear low density polyethylene Polymers 0.000 description 5
- 239000004707 linear low-density polyethylene Substances 0.000 description 5
- 210000002469 basement membrane Anatomy 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 241000272525 Anas platyrhynchos Species 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000287828 Gallus gallus Species 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000012775 heat-sealing material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 210000003739 neck Anatomy 0.000 description 2
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- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
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- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 210000004379 membrane Anatomy 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000021485 packed food Nutrition 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/738—Thermoformability
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2323/00—Polyalkenes
- B32B2323/04—Polyethylene
- B32B2323/043—HDPE, i.e. high density polyethylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2323/00—Polyalkenes
- B32B2323/04—Polyethylene
- B32B2323/046—LDPE, i.e. low density polyethylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
A kind of puncture-resistant oil resistivity heat-sealing compound counterdie, comprise involution layer, intermediate layer and backing layer, involution layer and backing layer are positioned at the both sides in intermediate layer, and the formation of involution layer is: low density polyethylene (LDPE) 10% ~ 35 wt %, metallocene polypropylene low-density elastomer 65% ~ 90wt%; Intermediate layer is configured to: high density polyethylene (HDPE) 70% ~ 85w%, low density polyethylene (LDPE) 15% ~ 30w%; Backing layer is configured to: medium density polyethylene 65% ~ 85w%, low density polyethylene (LDPE) 15% ~ 35%; Involution layer, intermediate layer and backing layer account for 5% ~ 20%, 60% ~ 80% and 5% ~ 20% of diaphragm gross weight respectively, and the weight ratio sum of involution layer, intermediate layer and backing layer is 100%.Compound counterdie of the present invention, obtained by coextrusion film blowing comprising involution layer, intermediate layer and backing layer compound counterdie, each layer forms especially involution layer composition and makes compound counterdie possess good puncture resistant ability, and effectively firmly involution can be carried out when there being grease, ensure the processability in coextrusion film blowing process and processing stability simultaneously.
Description
Technical Field
The invention relates to the technical field of processing and preparation of high polymer materials, in particular to a puncture-resistant oil-resistant heat-sealing composite base film and a preparation method thereof.
Background
At present, in daily life, people often contact various cooked food, such as duck necks, chicken wings and other instant cooked food. The common packaging structure for packaging the cooked food is to compound a polyethylene heat-sealing bottom film and an OPET/OPP surface film, print, make a bag, then fill the contents in the bag and seal the bag.
Specifically, the polyethylene heat-sealing base films commonly used in the market are produced by taking metallocene linear polyethylene as a main heat-sealing material, blending low-density polyethylene and common linear low-density polyethylene, and carrying out tape casting or film blowing. For general food packaging, the common formula can basically meet the use requirements, but when cooked food containing more oily substances and having bones or similar thorns such as duck necks and chicken wings is packaged, serious problems can be caused, firstly, because the sealing part is affected by oil, and the sealing is difficult when low-density polyethylene and common linear low-density polyethylene are blended in the presence of oily substances such as oil, the sealing strength is easy to be insufficient, the sealing property of the packaging is affected, and the deterioration rate of the contents, particularly oily meat foods, is increased; secondly, the film blended by the low-density polyethylene and the common linear low-density polyethylene generally has the problems of insufficient density and poor strength, so that the film is easy to be infiltrated by grease, the interlayer separation problem in a packaging structure is generated, the attractiveness and firmness of the package are seriously impressed, and the packaged food is easy to be polluted; thirdly, the anti-puncture property of the film prepared by blending the low-density polyethylene and the common linear low-density polyethylene is not enough, the film is easily damaged by the puncture of the content, not only can the fluid in the content overflow to damage the whole package, but also the external microorganism and the pollutant are introduced due to the whole damage of the package, and the effect and the safety of the package are seriously influenced.
In view of the above, a puncture-resistant oil-resistant heat-sealing composite base film and a preparation method thereof are provided to overcome the defects in the prior art, and are problems to be solved in the industry.
Disclosure of Invention
Based on the defects of the prior art, the technical problem to be solved by the invention is to provide a puncture-resistant oil-resistant heat-seal composite base film, the composite base film comprising a sealing layer, an intermediate layer and a back material layer is obtained by co-extrusion film blowing, and the sealing layer is prepared by compounding a metallocene polypropylene low-density elastomer and a low-density polyethylene, so that the composite base film has good puncture resistance, can be effectively and firmly sealed under the condition of grease, and simultaneously ensures the processability and the processing stability in the co-extrusion film blowing process.
The technical problem to be solved by the invention is also to provide a preparation method of the puncture-resistant oil-resistant heat-sealing composite base film, which is prepared by adopting a supercritical nitrogen fluid conveying system, carrying out production in a clean production system and carrying out a co-extrusion film blowing processing method.
In order to solve the technical problem, the invention provides a puncture-resistant oil-resistant heat-seal composite base film, which comprises a sealing layer, an intermediate layer and a back material layer, wherein the sealing layer, the intermediate layer and the back material layer are obtained by co-extrusion film blowing to obtain the composite base film; when the composite base films are sealed, the sealing layers between the composite base films are mutually bonded through heat sealing. Wherein,
the sealing layer is prepared from the following components in percentage by weight:
10 to 35 weight percent of low-density polyethylene,
65-90 wt% of metallocene polypropylene low-density elastomer.
The middle layer is prepared from the following components in percentage by weight:
70-85 w% of high-density polyethylene,
15-30 w% of low-density polyethylene.
The back material layer is prepared from the following components in percentage by weight:
65-85 w% of medium density polyethylene,
15% -35% of low-density polyethylene.
The sealing layer, the middle layer and the back material layer respectively account for 5% -20%, 60% -80% and 5% -20% of the total thickness of the protective film, and the total thickness of the sealing layer, the middle layer and the back material layer is 100%.
The sealing layer is one of the core contents of the invention, and the main components of the sealing layer are different from polyethylene heat-sealing bottom films in the prior art, and metallocene linear polyethylene is used as a main heat-sealing material, is matched with low-density polyethylene and common linear low-density polyethylene for blending, and is prepared by compounding a metallocene polypropylene low-density elastomer and low-density polyethylene resin. The metallocene polypropylene low-density elastomer is a main body material, the processability of the elastomer is poor, but the metallocene polypropylene low-density elastomer has low density and good flexibility, so that the metallocene polypropylene low-density elastomer can provide a good puncture resistance for a film, in addition, the anti-pollution heat sealing strength of the metallocene polypropylene low-density elastomer is good, a seal can be sealed under the condition that grease exists, and the sealing strength can meet the use requirement. Optimized low density polyethylene and metallocene polypropyleneThe compounding ratio of the elastomer is 20/80 wt%. The resin used is a commercially available blown film grade resin having a low density polyethylene melt flow rate of about 18 to 25g/10min and a density of about 0.92 to 0.926 kg/m3. The low density polyethylene may be selected from, but is not limited to, LDPE-LD600BA manufactured by Exxon Mobil. The metallocene polypropylene low density elastomer has a melt flow rate of about 9.5-15/10min and a density of about 0.89kg/m3(ii) a The metallocene polypropylene low-density elastomer can be selected from, but is not limited to, Metocene-EM248U manufactured by Basell company.
The middle layer is the second core content of the invention, and the characteristic of high density polyethylene is utilized, so that grease can be prevented from permeating the heat-sealing bottom film to a certain extent and neutralizing with the glue for compounding, and the problem of interlayer separation of the whole compound structure is avoided; the low-density polyethylene mainly plays a role in adjusting the processability, and can improve the puncture resistance of the film to a certain degree; moreover, the intermediate layer composition also ensures effective combination between the intermediate layer composition and the sealing layer and between the intermediate layer composition and the back material layer, and improves the mechanical property of the membrane. The optimum compounding ratio of the low density polyethylene and the high density polyethylene is 20/80 wt%. The resin used in the middle layer is a commercial blown film grade resin, the melt flow rate of the low density polyethylene is about 18-25 g/10min, and the density is about 0.92-0.926 kg/m3The low-density polyethylene may be selected from, but not limited to, LDPE-LD600BA manufactured by Exxon Mobil. The melt flow rate of the high density polyethylene is about 1.8 to 2.5g/10min, and the density is about 0.96 to 0.98 kg/m3. The high density polyethylene may be selected from, but is not limited to, HDPE-HD 8660.29 from Exxon Mobil.
The back material layer is the third content of the core of the invention, and uses the medium density polyethylene as the main material, on one hand, the back material layer provides certain strength for the film, and on the other hand, the processability of the back material layer can be adjusted to a certain degree compared with the high density polyethylene. The optimum compounding ratio of the low density polyethylene and the high density polyethylene is 30/70 wt%. The resin used is a commercial blown film grade resin, the melt flow rate of the low density polyethylene used is about 18-25 g/10min, the density is about 0.92-0.926 kg/m3, and the low density polyethylene can be selected from but not limited to LDPE-LD600BA produced by Exxon Mobil. The medium density polyethylene has a melt flow rate of about 0.3 to 1.0g/10min and a density of about 0.930 to 0.936 kg/m 3. The medium density polyethylene may be selected from, but is not limited to, MDPE-MD3505CH manufactured by Exxon Mobil.
The weight (thickness) proportional relation of the sealing layer, the middle layer and the back material layer in the total thickness of the composite bottom film is four of the core contents of the invention, and the weight (thickness) proportional relation of each layer is reasonably designed, so that the composite bottom film not only has good puncture resistance and strength performance, but also can be effectively and firmly sealed under the condition of grease, and simultaneously, the processability and the processing stability in the co-extrusion film blowing process are ensured.
In order to ensure the quality of the composite bottom film, the composite bottom film is prepared by a co-extrusion film blowing processing method, a three-layer co-extrusion heavy packaging film blowing machine is used, the raw materials enter a quality batcher from a stock bin, the quality batcher mixes the raw materials according to the ingredients of the composite bottom film related to the above contents, the raw materials are supplied to 3 extruders placed at different angles, the raw materials are sent to a die head through a screen changing mechanism to respectively form a film core layer and inner and outer layers, cooling air is blown in by a fan to blow and expand a film tube into film bubbles, the film bubbles are treated by an external cooling air ring and a film bubble internal cooling system, and then the film bubbles enter a rolling device to be rolled and cut, so that the puncture-resistant and oil-resistant heat-sealing composite.
Detailed Description
The features and advantages of the present invention are described in further detail below in conjunction with the preferred embodiments. The following embodiments are merely exemplary, and obvious modifications may be made thereto by those skilled in the art, and are also included in the scope of the present invention.
Example 1:
taking 90 parts of Methocene-EM 248U metallocene polypropylene low-density elastomer produced by Basell company and 10 parts of LDPE-LD600BA low-density polyethylene produced by Exxon Mobil as sealing layer resin of the composite base film; taking 85 parts of HDPE-HD 8660.29 high-density polyethylene produced by Exxon Mobil and 15 parts of LDPE-LD600BA low-density polyethylene produced by Exxon Mobil as middle layer resin of the composite base film; 80 parts of density polyethylene in MDPE-MD3505CH produced by Exxon Mobil and 20 parts of LDPE-LD600BA low density polyethylene produced by Exxon Mobil are taken as the middle layer resin of the composite base film and taken as the back material layer resin of the composite base film.
Wherein, the amount of the raw materials of each layer accounts for 5 percent, 80 percent and 15 percent of the total mass of the composite bottom film respectively.
The preparation process comprises the following steps: the three-layer co-extrusion heavy packaging film blow molding machine is used for mixing materials according to the formula, the materials enter a mass proportioning device from a storage bin, the mass proportioning device well mixes the raw materials according to the proportion and supplies the mixed raw materials to 3 extruders placed at different angles, a screen changing mechanism sends the mixed raw materials to a die head to respectively form a film core layer and an inner layer and an outer layer, a fan blows cooling air to blow and expand a film tube into film bubbles, the film bubbles are cooled by an external cooling air ring and a film bubble inner cooling system, and then the film bubbles are treated by a drafting device and a corona processor and enter a winding device to be wound and cut, so that the puncture-resistant and oil-resistant heat-sealing composite. Wherein, the temperature interval of the extruder cylinder is as follows: 185 ℃ in the area 1, 220 ℃ in the area 2, 200 ℃ in the area 3, 185 ℃ in the area 4 and 175 ℃ in the screen changing runner; the temperature of the film opening is 190 ℃ to 220 ℃.
Example 2:
taking 80 parts of Methocene-EM 248U metallocene polypropylene low-density elastomer produced by Basell company and 20 parts of LDPE-LD600BA low-density polyethylene produced by Exxon Mobil as sealing layer resin of the composite base film; taking 80 parts of HDPE-HD 8660.29 high-density polyethylene produced by Exxon Mobil and 20 parts of LDPE-LD600BA low-density polyethylene produced by Exxon Mobil as middle layer resin of the composite base film; 75 parts of density polyethylene in MDPE-MD3505CH produced by Exxon Mobil and 25 parts of LDPE-LD600BA low density polyethylene produced by Exxon Mobil are taken as the middle layer resin of the composite base film and taken as the back material layer resin of the composite base film.
Wherein, the amount of the raw materials of each layer accounts for 10 percent, 70 percent and 20 percent of the mass of the whole composite bottom film respectively.
The preparation process comprises the following steps: the three-layer co-extrusion heavy packaging film blow molding machine is used for mixing materials according to the formula, the materials enter a mass proportioning device from a storage bin, the mass proportioning device well mixes the raw materials according to the proportion and supplies the mixed raw materials to 3 extruders placed at different angles, a screen changing mechanism sends the mixed raw materials to a die head to respectively form a film core layer and an inner layer and an outer layer, a fan blows cooling air to blow and expand a film tube into film bubbles, the film bubbles are cooled by an external cooling air ring and a film bubble inner cooling system, and then the film bubbles are treated by a drafting device and a corona processor and enter a winding device to be wound and cut, so that the puncture-resistant and oil-resistant heat-sealing composite. Wherein, the temperature interval of the extruder cylinder is as follows: 185 ℃ in the 1 area, 220 ℃ in the 2 area, 205 ℃ in the 3 area, 185 ℃ in the 4 area and 175 ℃ in the screen changing runner; the temperature of the film opening is 190 ℃ to 220 ℃.
Example 3:
taking 80 parts of Methocene-EM 248U metallocene polypropylene low-density elastomer produced by Basell company and 20 parts of LDPE-LD600BA low-density polyethylene produced by Exxon Mobil as sealing layer resin of the composite base film; taking 80 parts of HDPE-HD 8660.29 high-density polyethylene produced by Exxon Mobil and 20 parts of LDPE-LD600BA low-density polyethylene produced by Exxon Mobil as middle layer resin of the composite base film; 70 parts of density polyethylene in MDPE-MD3505CH produced by Exxon Mobil and 30 parts of LDPE-LD600BA low density polyethylene produced by Exxon Mobil are taken as the middle layer resin of the composite base film and are taken as the back material layer resin of the composite base film.
Wherein, the amount of the raw materials of each layer accounts for 20 percent, 70 percent and 10 percent of the mass of the whole composite bottom film respectively.
The preparation process comprises the following steps: the three-layer co-extrusion heavy packaging film blow molding machine is used for mixing materials according to the formula, the materials enter a mass proportioning device from a storage bin, the mass proportioning device well mixes the raw materials according to the proportion and supplies the mixed raw materials to 3 extruders placed at different angles, a screen changing mechanism sends the mixed raw materials to a die head to respectively form a film core layer and an inner layer and an outer layer, a fan blows cooling air to blow and expand a film tube into film bubbles, the film bubbles are cooled by an external cooling air ring and a film bubble inner cooling system, and then the film bubbles are treated by a drafting device and a corona processor and enter a winding device to be wound and cut, so that the puncture-resistant and oil-resistant heat-sealing composite. Wherein, the temperature interval of the extruder cylinder is as follows: 185 ℃ in the 1 area, 220 ℃ in the 2 area, 205 ℃ in the 3 area, 185 ℃ in the 4 area and 175 ℃ in the screen changing runner; the temperature of the film opening is 190 ℃ to 220 ℃.
The preparation process comprises the following steps: the three-layer co-extrusion heavy packaging film blow molding machine is used for mixing materials according to the formula, the materials enter a mass proportioning device from a storage bin, the mass proportioning device well mixes the raw materials according to the proportion and supplies the mixed raw materials to 3 extruders placed at different angles, a screen changing mechanism sends the mixed raw materials to a die head to respectively form a film core layer and an inner layer and an outer layer, a fan blows cooling air to blow and expand a film tube into film bubbles, the film bubbles are cooled by an external cooling air ring and a film bubble inner cooling system, and then the film bubbles are treated by a drafting device and a corona processor and enter a winding device to be wound and cut, so that the puncture-resistant and oil-resistant heat-sealing composite. Wherein, the temperature interval of the extruder cylinder is as follows: 185 ℃ in the 1 area, 220 ℃ in the 2 area, 205 ℃ in the 3 area, 185 ℃ in the 4 area and 175 ℃ in the screen changing runner; the temperature of the film opening is 190 ℃ to 220 ℃.
Example 4:
70 parts of Metocene-EM248U metallocene polypropylene low-density elastomer produced by Basell company and 30 parts of LDPE-LD600BA low-density polyethylene produced by Exxon Mobil are taken as sealing layer resin of the composite base film; taking 75 parts of HDPE-HD 8660.29 high-density polyethylene produced by Exxon Mobil and 25 parts of LDPE-LD600BA low-density polyethylene produced by Exxon Mobil as middle layer resin of the composite base film; 85 parts of density polyethylene in MDPE-MD3505CH produced by Exxon Mobil and 15 parts of LDPE-LD600BA low density polyethylene produced by Exxon Mobil are taken as the middle layer resin of the composite base film and taken as the back material layer resin of the composite base film.
Wherein, the amount of the raw materials of each layer accounts for 5 percent, 90 percent and 5 percent of the mass of the whole composite bottom film respectively.
The preparation process comprises the following steps: the three-layer co-extrusion heavy packaging film blow molding machine is used for mixing materials according to the formula, the materials enter a mass proportioning device from a storage bin, the mass proportioning device well mixes the raw materials according to the proportion and supplies the mixed raw materials to 3 extruders placed at different angles, a screen changing mechanism sends the mixed raw materials to a die head to respectively form a film core layer and an inner layer and an outer layer, a fan blows cooling air to blow and expand a film tube into film bubbles, the film bubbles are cooled by an external cooling air ring and a film bubble inner cooling system, and then the film bubbles are treated by a drafting device and a corona processor and enter a winding device to be wound and cut, so that the puncture-resistant and oil-resistant heat-sealing composite. Wherein, the temperature interval of the extruder cylinder is as follows: 185 ℃ in the 1 area, 220 ℃ in the 2 area, 205 ℃ in the 3 area, 185 ℃ in the 4 area and 175 ℃ in the screen changing runner; the temperature of the film opening is 195-220 ℃.
Example 5:
taking 65 parts of Methocene-EM 248U metallocene polypropylene low-density elastomer produced by Basell company and 35 parts of LDPE-LD600BA low-density polyethylene produced by Exxon Mobil as sealing layer resin of the composite base film; taking 70 parts of HDPE-HD 8660.29 high-density polyethylene produced by Exxon Mobil and 30 parts of LDPE-LD600BA low-density polyethylene produced by Exxon Mobil as middle layer resin of the composite base film; 65 parts of density polyethylene in MDPE-MD3505CH produced by Exxon Mobil and 35 parts of LDPE-LD600BA low density polyethylene produced by Exxon Mobil are taken as middle layer resin of the composite base film and taken as back material layer resin of the composite base film.
Wherein, the amount of the raw materials of each layer accounts for 20 percent, 60 percent and 20 percent of the mass of the whole composite bottom film respectively.
The preparation process comprises the following steps: the three-layer co-extrusion heavy packaging film blow molding machine is used for mixing materials according to the formula, the materials enter a mass proportioning device from a storage bin, the mass proportioning device well mixes the raw materials according to the proportion and supplies the mixed raw materials to 3 extruders placed at different angles, a screen changing mechanism sends the mixed raw materials to a die head to respectively form a film core layer and an inner layer and an outer layer, a fan blows cooling air to blow and expand a film tube into film bubbles, the film bubbles are cooled by an external cooling air ring and a film bubble inner cooling system, and then the film bubbles are treated by a drafting device and a corona processor and enter a winding device to be wound and cut, so that the puncture-resistant and oil-resistant heat-sealing composite. Wherein, the temperature interval of the extruder cylinder is as follows: 185 ℃ in the 1 area, 210 ℃ in the 2 area, 205 ℃ in the 3 area, 185 ℃ in the 4 area and 175 ℃ in the screen changing runner; the temperature of the film opening is 195-210 ℃.
Example 6
And (3) performance detection:
the puncture-resistant oil-resistant heat-seal composite base film prepared by the method in the embodiment 1-5 is tested for some specific parameters according to corresponding national standards, and the specific parameters and corresponding requirements are detailed in the following table.
Table-test parameters and standards for composite base films
And obtaining the quality parameters in the second table according to the test method in the corresponding test standard.
Test parameters and standards for the two-layer composite base film
The test parameters in the table II show that all the parameters of the puncture-resistant oil-resistant heat-sealing composite basement membrane prepared in the embodiments of the invention are superior to the national standard, the puncture-resistant oil-resistant heat-sealing composite basement membrane has good puncture resistance, can be effectively and firmly sealed under the condition of grease, and simultaneously ensures the processability and the processing stability in the co-extrusion film blowing process. In addition, through the anti-seepage test of grease, hot oil with the temperature of 80-100 ℃ is applied to the surface of the puncture-resistant oil-resistant heat-sealing composite basement membrane for 72 hours, so that the phenomenon of seepage is avoided, and hot water seepage is prevented; the penetration phenomenon does not occur within 12-24 months when the normal temperature grease oil is applied on the surface of the puncture-resistant oil-resistant heat-sealing composite basement membrane. Therefore, the puncture-resistant oil-resistant heat-seal composite base film can effectively prevent grease from permeating the heat-seal base film, and the problem of interlayer separation of the whole composite structure is avoided.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (2)
1. The puncture-resistant oil-resistant heat-seal composite bottom film is characterized by comprising a sealing layer, an intermediate layer and a back material layer, wherein the sealing layer, the intermediate layer and the back material layer are obtained by co-extrusion film blowing, the sealing layer and the back material layer are positioned on two sides of the intermediate layer, and contents in a packaging bag made of the composite bottom film are in contact with the sealing layer of the composite bottom film; when the composite bottom film is sealed, the sealing layers between the composite bottom films are mutually bonded through heat sealing;
wherein, the sealing layer is prepared from the following components in percentage by weight:
the sealing layer is composed of low-density polyethylene and metallocene low-density polyethylene according to a weight ratio of 1/4; the metallocene polypropylene low-density elastomer used in the sealing layer has a melt flow rate of 1.5-2.5g/10min and a density of 0.89kg/m3(ii) a The low density polyethylene has a melt flow rate of 18 to 25g/10min and a density of 0.92 to 0.926 kg/m3；
The middle layer is prepared from the following components in percentage by weight:
the middle layer is composed of 1/4 parts by weight of low-density polyethylene and high-density polyethylene; the melt flow rate of the high-density polyethylene used in the middle layer is 1.8-2.5 g/10min, and the density is 0.96-0.98 kg/m3(ii) a The low density polyethylene has a melt flow rate of 18 to 25g/10min and a density of 0.92 to 0.926 kg/m3；
The back material layer is prepared from the following components in percentage by weight:
the backing material layer is composed of low-density polyethylene and medium-density polyethylene according to a weight ratio of 3/7; the melt flow rate of the medium density polyethylene used in the backing material layer is 0.3-1.0 g/10min, and the density is 0.930-0.936 kg/m3(ii) a The low density polyethylene has a melt flow rate of 18 to 25g/10min and a density of 0.92 to 0.926 kg/m3；
The sealing layer, the middle layer and the back material layer respectively account for 5-20%, 60-80% and 5-20% of the total weight of the protective film, and the sum of the weight ratios of the sealing layer, the middle layer and the back material layer is 100%.
2. The preparation method of the puncture-resistant oil-resistant heat-sealing composite base film according to claim 1, which is characterized in that the compound base film is prepared by a co-extrusion film blowing process, a three-layer co-extrusion heavy packaging film blowing machine is used, the raw materials enter a mass batcher from a stock bin, the mass batcher mixes the raw materials according to the compound base film of claim 1, the mixed raw materials are supplied to 3 extruders arranged at different angles, the mixed raw materials are sent to a die head through a screen changing mechanism to respectively form a film core layer and inner and outer layers, cooling air is blown in by a fan to blow and expand a film tube into film bubbles, the film bubbles are cooled by an external cooling air ring and a film bubble internal cooling system, and the cooled film bubbles are treated by a drafting device and a corona processor and then enter a rolling device to be rolled and cut, so that.
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| CN107458057A (en) * | 2017-07-28 | 2017-12-12 | 四川兴达塑料有限公司 | A kind of grease proofing PE preservative films |
| CN108032577A (en) * | 2017-11-10 | 2018-05-15 | 苏州鸿博斯特超净科技股份有限公司 | High intensity cleaning PE films and preparation method thereof |
| CN113561598A (en) * | 2021-06-17 | 2021-10-29 | 浙江鼎乾薄膜股份有限公司 | High-performance composite film for packaging and preparation method thereof |
| CN113561592A (en) * | 2021-06-17 | 2021-10-29 | 浙江鼎乾薄膜股份有限公司 | Non-toxic packaging film for food packaging and preparation method thereof |
| CN114142170A (en) * | 2021-10-22 | 2022-03-04 | 浙江华正能源材料有限公司 | Puncture-resistant electrolyte-resistant cast polypropylene film, aluminum plastic film and application thereof |
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