CN113968009A - PVDC co-extrusion substrate film and preparation method and application thereof - Google Patents
PVDC co-extrusion substrate film and preparation method and application thereof Download PDFInfo
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- CN113968009A CN113968009A CN202110870539.2A CN202110870539A CN113968009A CN 113968009 A CN113968009 A CN 113968009A CN 202110870539 A CN202110870539 A CN 202110870539A CN 113968009 A CN113968009 A CN 113968009A
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- 229920001328 Polyvinylidene chloride Polymers 0.000 title claims abstract description 63
- 239000005033 polyvinylidene chloride Substances 0.000 title claims abstract description 63
- 238000001125 extrusion Methods 0.000 title claims abstract description 23
- 239000000758 substrate Substances 0.000 title claims abstract description 12
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000011347 resin Substances 0.000 claims abstract description 57
- 229920005989 resin Polymers 0.000 claims abstract description 57
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000002844 melting Methods 0.000 claims abstract description 12
- 230000008018 melting Effects 0.000 claims abstract description 12
- 239000012748 slip agent Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 230000004888 barrier function Effects 0.000 abstract description 3
- 238000010030 laminating Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 44
- 238000012545 processing Methods 0.000 description 13
- 239000003795 chemical substances by application Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000012792 core layer Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 description 1
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Images
Classifications
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/56—Screws having grooves or cavities other than the thread or the channel
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/64—Screws with two or more threads
-
- 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
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
-
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/08—Copolymers of ethylene
- B29K2023/083—EVA, i.e. ethylene vinyl acetate copolymer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/08—PVDC, i.e. polyvinylidene chloride
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention belongs to the field of co-extruded films, and particularly relates to a PVDC co-extruded base material film and a preparation method and application thereof. Melting and blending PVDC resin and EVA resin by an improved single-screw extruder to prepare PVDC and EVA molten resin; then sequentially passing the PVDC and the EVA molten resin through a screw and a die head of a single-screw extruder, and laminating layer by layer through a central cylinder to finally form the resin with a multilayer structure; when the resin with the multilayer structure is extruded by a die lip of a die head, a slip agent is added on line in an inner layer extruder, and then the PVDC co-extrusion substrate film is formed by inflation cooling, a clamping roller, a slitting knife and a winding device. The application solves the problems that an EVA resin film is difficult to machine and form and difficult to delaminate, and provides a film which has high barrier property, softness, smoothness and good elasticity.
Description
Technical Field
The invention relates to the field of co-extruded films, in particular to a PVDC co-extruded base material film and a preparation method and application thereof.
Background
The co-extrusion technology is rapidly developed at home and abroad in recent years, most of the co-extrusion technology is around the research of taking EVOH and PA as core layers, and the patent CN 201580004596.5 provides a manufacturing method of a heat shrinkable packaging film as a multi-layer co-extruded film taking PVDC as the core layer, so that the stretching and packaging functions with stable size cannot be realized when the film is heated. The co-extruded PVDC films proposed in patent CN 201401425519.4, patent CN 201410425827.7 and patent 201410427455.1, but none of these applications mention the PVDC layer ratios and each layer formulation; the structure of the PVDC is typically characterized in that EVA is adopted on both sides of the PVDC layer; the inner heat-seal layer is directly connected with EVA, and has no secondary inner layer. The adhesive layer EVA mentioned in the application has a melting point of 77 ℃, can be used only below 98 ℃, further improves the sterilization temperature (such as 100-110 ℃), causes poor packaging appearance such as delamination and whitening of the film, serious deformation of the appearance and the like, and cannot resist the requirement of high-temperature sterilization. The absence of a sub-inner layer makes the cost control of the structure difficult to reduce and does not allow the use of a skeletal resin to balance the flatness problem caused by the difference in density of the inner and outer layers. Polyvinylidene chloride resin has high barrier property, but is sensitive to temperature in the processing process, equipment heating and rotating shearing heat can affect the melting state of polyvinylidene chloride in the processing process, the size of a clearance between a screw groove and a screw cylinder and the running state of a screw can affect the production quality of a co-extruded film, and the PVDC co-extruded film in the prior art has quality problems of carbonization points, thin points and the like. The EVA film has good hand feeling, smoothness, good elasticity and softness, but is not easy to machine and form and delaminate in the up-blowing processing process, and has higher production cost.
Disclosure of Invention
In order to solve the technical problems, the invention provides a PVDC co-extrusion base material film and a preparation method thereof.
The technical scheme of the invention is realized as follows:
a preparation method of a PVDC co-extrusion substrate film comprises the following steps:
(1) melting and blending PVDC resin and EVA resin by an improved single-screw extruder to prepare PVDC and EVA molten resin;
(2) the PVDC and EVA molten resin in the step (1) sequentially passes through a screw and a die head of a single-screw extruder and is laminated layer by layer through a central cylinder, and finally the resin with a multilayer structure is formed;
(3) and (3) adding a slip agent on line into the inner layer extruder when the resin with the multilayer structure in the step (2) is extruded by a die lip of the die head, and forming the PVDC co-extrusion substrate film by virtue of a blowing cooling device, a clamping roller, a slitting knife and a winding device.
In the step (1), the melting temperature of the PVDC resin is 160 ℃, the melting temperature of the EVA resin is 170 ℃, and the mass ratio of the PVDC resin to the EVA resin is 1: 3.
The diameters of the screw rods in the step (2) are respectively 76mm, 65mm and 50mm, the length-diameter ratio is 30:1, and the heating zones are respectively 6 zones 170, 180, 190 ℃, 5 zones 150, 160 ℃, 5 zones 170, 180, 190 and 190 ℃.
The slip agent in the step (3) is SAB808, and the addition proportion of the slip agent is 3-6% of the addition mass based on the extrusion amount of the inner layer extruder and the outer layer extruder.
The temperature of the blowing cooling in the step (3) is 8 ℃, and the speed of the winding device is 19 m/min.
The improved single-screw extruder is designed into an independent extruder and a die head aiming at the existing double-screw extruder, and a screw on the extruder is provided with a deep groove thread feeding section and a melt groove separation structure melting section.
The PVDC co-extruded base material film prepared by the method.
The PVDC co-extrusion base material film comprises six layers of resin materials which are adjacent in sequence, wherein the first layer, the second layer, the third layer, the fifth layer and the sixth layer are EVA layers, and the fourth layer is a PVDC layer.
The PVDC co-extrusion base material film is applied to a medical ostomy bag film.
The invention has the following beneficial effects:
1. PVDC is a temperature sensitive material, has a very large shear heat, often causes decomposition due to the shear heat, and results in a short processing cycle. The existing PVDC screw structure is a gradual change structure, the rotating speed of the screw is generally controlled to be 30-40RPM due to the problem of shear heat, the yield is low, the processing period is short, and the processing period is generally about one week. The screw structure of the application breaks the convention as shown in figure 1, the deep groove feeding section (part D) and the large melt groove separation structure melting section (compression section) are adopted, the problem of smooth transition of the contact surface of the existing main thread and a solid phase groove is improved, and the molten PVDC can enter a separation melt groove at once, so that the melt shearing rate is greatly reduced, the rotating speed of the screw can be increased to more than 55RPM (revolution per minute), the extrusion capacity of more than 150 kilograms is realized, the screw structure is 1.36-1.5 times of the original traditional screw (110 kilograms), the processing period can be more than one month, and the production efficiency and the yield are greatly improved.
2, the design of a low-shear special mixing head is adopted, so that the uniform mixing of the melt is realized, and the quality of the film is improved. The invention adopts a single extruder and a die head, can realize effective control of the processing temperature required by different raw materials, can effectively solve the problem of PVDC resin decomposition caused by large processing temperature between different layers in the co-extrusion process due to low EVA processing temperature which is close to the processing temperature of PVDC resin, reduces the quality defects of carbon spots, bubbles, fish eyes and the like by reasonably setting the EVA layer processing temperature, and has higher input-output ratio. By adjusting the processing temperature of the EVA layer and adding 3-6% of a slipping agent and an opening agent, the problems that an EVA resin film is not easy to process and form and is difficult to delaminate are solved, and the film with high barrier property, softness, smoothness and good elasticity is provided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a diagram of a modified co-extrusion screw.
Fig. 2 is a view showing a conventional screw structure.
FIG. 3 is a graph showing the results of detection in example 1.
FIG. 4 is a graph showing the results of detection in example 2.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
The preparation method of the skin color PVDC co-extruded base material film comprises the following steps:
(1) PVDC resin enters the screw groove and the screw cylinder through the feed opening and is melted at a high temperature of 160 ℃ to form molten resin; EVA resin enters the screw groove and the screw cylinder through the feed opening and is melted at a high temperature of 170 ℃ to form molten resin;
(2) the product adopts EVA and PVDC resin according to the proportion of 3:1, passes through screw rods with different diameters and independently superposed die heads, is subjected to temperature regulation in different areas, is laminated layer by layer through a central cylinder, moves from bottom to top, finally forms a multilayer structure, is extruded by a die lip, is added with a slip agent SAB808 in the inner layer, is subjected to air cooling, blowing and cooling at the temperature of 8 ℃, passes through a clamping roller, a splitting knife and a winding device, and is formed into a film.
Wherein the extrusion capacity of the PVDC layer in each hour is controlled to be 40kg/h, the diameter of the screw is 65mm, and the length-diameter ratio is 24: 1, the heating area is 4 areas, and the die head adopts an oil heater and is not influenced by the temperature of other areas; the diameters of the EVA screws are 76mm, 65mm and 50mm respectively, the length-diameter ratio is 30:1, the heating zones are 6 zones, 5 zones and 5 zones respectively, die heads in the zones can be independently heated and are not influenced by the temperature of each layer of die head; the addition proportion of the slipping agent is 3 percent based on the hourly output of the inner layer extruder and the outer layer extruder; the winding speed was 19 m/min.
The skin color PVDC co-extruded film prepared in the embodiment 1 of the application is detected by the chemical company Limited of Loxoho, and the detection result report is numbered as follows: ZS20200331006, the results are shown in FIG. 3.
Example 2
The preparation method of the transparent PVDC co-extrusion substrate film of the embodiment comprises the following steps:
(1) PVDC resin enters the screw groove and the screw cylinder through the feed opening and is melted at a high temperature of 160 ℃ to form molten resin; EVA resin enters the screw groove and the screw cylinder through the feed opening and is melted at a high temperature of 170 ℃ to form molten resin;
(2) the product adopts EVA and PVDC resin to pass through screw rods with different diameters and die heads which are independently overlapped, and the EVA and PVDC resin are laminated layer by layer through a central cylinder after the temperature of different areas is adjusted, and the multilayer structure is finally formed by moving from bottom to top and is extruded by a die lip, meanwhile, a slip agent is added into the inner layer, and then the film is formed through air cooling, blowing and cooling at 8 ℃, passing through a clamping roller, a splitting knife and a winding device.
Wherein the extrusion amount is controlled at 30kg/h, the diameter of a screw is 65mm, and the length-diameter ratio is 24: 1, the heating area is 4 areas, and the die head adopts an oil heater and is not influenced by the temperature of other areas; the diameters of the EVA screws are 76mm, 65mm and 50mm respectively, the length-diameter ratio is 30:1, the heating zones are 6 zones, 5 zones and 5 zones respectively, die heads in the zones can be independently heated and are not influenced by the temperature of each layer of die head; the adding proportion of the slipping agent is 4 percent; the winding speed was 19 m/min.
The skin color PVDC co-extruded film prepared in the embodiment 1 of the application is detected by the chemical company Limited of Loxoho, and the detection result report is numbered as follows: ZS20200331005, the results are shown in FIG. 4.
Example 3
The preparation method of the PVDC co-extruded substrate film of the embodiment includes the following steps:
(1) PVDC resin enters the screw groove and the screw cylinder through the feed opening and is melted at a high temperature of 160 ℃ to form molten resin; EVA resin enters the screw groove and the screw cylinder through the feed opening and is melted at a high temperature of 170 ℃ to form molten resin;
(2) the product adopts EVA and PVDC resin to pass through screw rods with different diameters and die heads which are independently overlapped, and the EVA and PVDC resin are laminated layer by layer through a central cylinder after the temperature of different areas is adjusted, and the multilayer structure is finally formed by moving from bottom to top and is extruded by a die lip, meanwhile, a slip agent is added into the inner layer, and then the film is formed through air cooling, blowing and cooling at 8 ℃, passing through a clamping roller, a splitting knife and a winding device.
Wherein the extrusion capacity is controlled to be 35kg/h, the diameter of the screw is 65mm, and the length-diameter ratio is 24: 1, the heating area is 4 areas, and the die head adopts an oil heater and is not influenced by the temperature of other areas; the diameters of the EVA screws are 76mm, 65mm and 50mm respectively, the length-diameter ratio is 30:1, the heating zones are 6 zones, 5 zones and 5 zones respectively, die heads in the zones can be independently heated and are not influenced by the temperature of each layer of die head; the adding proportion of the slipping agent is 6 percent; the winding speed was 19 m/min.
Example 4
The preparation method of the PVDC co-extruded substrate film of the embodiment includes the following steps:
(1) PVDC resin enters the screw groove and the screw cylinder through the feed opening and is melted at a high temperature of 160 ℃ to form molten resin; EVA resin enters the screw groove and the screw cylinder through the feed opening and is melted at a high temperature of 170 ℃ to form molten resin;
(2) the product adopts EVA and PVDC resin to pass through screw rods with different diameters and die heads which are independently overlapped, and the EVA and PVDC resin are laminated layer by layer through a central cylinder after the temperature of different areas is adjusted, and the multilayer structure is finally formed by moving from bottom to top and is extruded by a die lip, meanwhile, a slip agent is added into the inner layer, and then the film is formed through air cooling, blowing and cooling at 8 ℃, passing through a clamping roller, a splitting knife and a winding device.
Wherein the extrusion amount is controlled at 30kg/h, the diameter of a screw is 65mm, and the length-diameter ratio is 24: 1, the heating area is 4 areas, and the die head adopts an oil heater and is not influenced by the temperature of other areas; the diameters of the EVA screws are 76mm, 65mm and 50mm respectively, the length-diameter ratio is 30:1, the heating zones are 6 zones, 5 zones and 5 zones respectively, die heads in the zones can be independently heated and are not influenced by the temperature of each layer of die head; the adding proportion of the slipping agent is 5 percent; the winding speed was 19 m/min.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The preparation method of the PVDC co-extrusion base material film is characterized by comprising the following steps:
(1) melting and blending PVDC resin and EVA resin by an improved single-screw extruder to prepare PVDC and EVA molten resin;
(2) the PVDC and EVA molten resin in the step (1) sequentially passes through a screw and a die head of a single-screw extruder and is laminated layer by layer through a central cylinder, and finally the resin with a multilayer structure is formed;
(3) and (3) adding a slip agent on line into the inner layer extruder when the resin with the multilayer structure in the step (2) is extruded by a die lip of the die head, and forming the PVDC co-extrusion substrate film by virtue of a blowing cooling device, a clamping roller, a slitting knife and a winding device.
2. The method of claim 1, wherein: in the step (1), the melting temperature of the PVDC resin is 160 ℃, the melting temperature of the EVA resin is 170 ℃, and the mass ratio of the PVDC resin to the EVA resin is 1: 3.
3. The method of claim 1, wherein: the diameters of the screw rods in the step (2) are respectively 76mm, 65mm and 50mm, the length-diameter ratio is 30:1, and the heating zones are respectively 6 zones 170, 180, 190 ℃, 5 zones 150, 160 ℃, 5 zones 170, 180, 190 and 190 ℃.
4. The method of claim 1, wherein: the slip agent in the step (3) is SAB808, and the addition proportion of the slip agent is 3-6% of the addition mass based on the extrusion amount of the inner layer extruder and the outer layer extruder.
5. The method of claim 1, wherein: the temperature of the blowing cooling in the step (3) is 8 ℃, and the speed of the winding device is 19 m/min.
6. The production method according to any one of claims 1 to 5, characterized in that: the improved single-screw extruder is designed into an independent extruder and a die head aiming at the existing single-screw extruder, and a screw on the extruder is provided with a deep groove thread feeding section and a melt groove separation structure melting section.
7. A PVDC co-extruded substrate film made by the method of claim 6.
8. The PVDC coextruded substrate film of claim 7, wherein: the PVDC co-extrusion base material film comprises six layers of resin materials which are adjacent in sequence, wherein the first layer, the second layer, the third layer, the fifth layer and the sixth layer are EVA layers, and the fourth layer is a PVDC layer.
9. Use of the PVDC co-extruded substrate film of claim 8 as a medical ostomy pouch film.
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