CN111890655B - Multi-layer co-extrusion production process of biaxially oriented polyethylene antibacterial antifogging film - Google Patents
Multi-layer co-extrusion production process of biaxially oriented polyethylene antibacterial antifogging film Download PDFInfo
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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
- B29C48/16—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
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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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
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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
- B29C48/001—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
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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
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/02—Thermal after-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
Abstract
The invention discloses a multilayer coextrusion production process of a biaxially oriented polyethylene antibacterial antifogging film, which belongs to the field of films, and can realize high production speed and yield, and simultaneously, the film produced by the process has antifogging property and high mechanical and optical properties, and can be adhered to the inner wall of a touch head which is close to each other and move downwards through the arrangement of a homogenizing diaphragm ball in the production process, and a layer of interlayer can be formed between an inner extrusion material and an outer extrusion material by heating the homogenizing distributor when passing through the homogenizing distributor, so that a transparent antistatic layer is formed between a subsurface layer and an outer surface layer of the formed film, on one hand, the static electricity of the finished film can be effectively eliminated, the use is convenient, on the other hand, the connection strength between the subsurface layer and the outer surface layer can be effectively improved through the transparent antistatic layer, the mechanical property of the film is obviously improved, and the optical property of the film can be effectively improved.
Description
Technical Field
The invention relates to the field of films, in particular to a multi-layer co-extrusion production process of a biaxially oriented polyethylene antibacterial and antifogging film.
Background
PE film, polyethylene film, refers to a film produced from PE film. The PE film has moisture resistance and small moisture permeability. The polyethylene film (PE) can be used for manufacturing products with different properties such as low-density, medium-density and high-density polyethylene, crosslinked polyethylene and the like according to different manufacturing methods and control means.
The polyethylene is non-toxic and tasteless white powder or granules, is milky in appearance, has a wax-like hand feeling, and has low water absorption rate of less than 0.01 percent. Polyethylene films are transparent and decrease with increasing crystallinity. Polyethylene films have low water permeability but high air permeability and are not suitable for freshness packaging but for moisture-proof packaging. The flame is inflammable, the oxygen index is 17.4, the flame is low in smoke during combustion, a small amount of molten drops exist, the flame is yellow on the top and blue on the bottom, and the paraffin smell exists. Polyethylene has good water resistance. The product surface is non-polar, difficult to adhere and print, and improved by surface treatment. Branched polymers are poorly resistant to photodegradation and oxidation.
The molecular weight is in the range of 1 to 10 ten thousand. Ultra-high molecular weight polyethylene having a molecular weight of more than 10 ten thousand. The higher the molecular weight, the better the physical and mechanical properties, and the closer to the required level of engineering materials. However, the higher the molecular weight, the more difficult it is to process. The melting point of the polyethylene is 100-130 ℃, and the low-temperature resistance is excellent. The mechanical property can be kept at-60 ℃, but the use temperature is 80-110 ℃. It is insoluble in any known solvent at normal temperature, and can be dissolved in a small amount in solvents such as toluene, amyl acetate, trichloroethylene and the like at the temperature of more than 70 ℃.
When a small-width production line is used for producing the biaxially oriented polyethylene film in the prior art, the output of an extruder is low, the extrusion output is about 1 ton/h, the production line speed is low, the speed is lower than 150 m/h, only about 10 tons of film can be produced every day, namely, the overall production efficiency is low, the stability is poor during production, a large number of broken films are generated during production, the longitudinal and transverse stretching ratio is small, the optical and mechanical properties of the product are poor, and the biaxially oriented polyethylene antifogging film technology is not available in the prior art.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a multilayer co-extrusion production process of a biaxially oriented polyethylene antibacterial and antifogging film, which can realize high production speed and yield, and simultaneously, the film produced by the process has antifogging property and high mechanical and optical properties, in the production process, through the arrangement of homogenized diaphragm balls, the film can be distributed on the inner walls of mutually close probes in an adherence manner and move downwards, and when passing through a homogenized distributor, the homogenized distributor is heated, so that a layer of interlayer can be formed between an inner extrusion material and an outer extrusion material, a transparent antistatic layer is formed between the subsurface layer and the outer surface layer of the formed film, on one hand, the static electricity of the finished film can be effectively eliminated, the use is convenient, on the other hand, the connection strength between the subsurface layer and the outer surface layer can be effectively improved through the transparent antistatic layer, the mechanical property of the film is obviously improved, and the optical property of the film can be effectively improved.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The multi-layer co-extrusion production process of the biaxially oriented polyethylene antibacterial antifogging film comprises the following steps:
s1, firstly, crushing the polyethylene, and drying to obtain a master batch for later use;
s2, adding an antistatic agent and an antifogging agent into a part of polyethylene master batch to obtain an inner extrusion material;
s3, mixing a polyethylene heat sealing material and a delustering material, adding an antifogging agent, an antibacterial material and an antisticking agent, uniformly mixing to obtain an outer extrusion material, and adding homogenizing diaphragm balls into the outer extrusion material and part of the inner extrusion material;
s4, respectively putting different inner extrusion materials and outer extrusion materials into five different die heads of a multilayer co-extruder, putting the inner extrusion materials without the homogenized diaphragm spheres into the die head in the middle, putting the inner extrusion materials with the homogenized diaphragm spheres into the die heads on two sides of the die head in the middle, and putting the outer extrusion materials into the two die heads on the outermost sides;
s5, the homogenized diaphragm balls in the multiple die heads of the multilayer co-extruder attract each other, so that the homogenized diaphragm balls are adsorbed to each other and are arranged along the inner walls of the die heads close to each other, and move downwards, when the homogenized diaphragm balls pass through the homogenized distributor, the homogenized diaphragm balls are heated by the homogenized distributor, so that the homogenized diaphragm balls are gradually dissolved, a layer of interlayer is formed between the inner extrusion material and the outer extrusion material, the inner extrusion material and the outer extrusion material are effectively prevented from being easily crossed with each other, the stability between the layers is effectively improved, the quality of the obtained film is better, and then the two-way stretching polyethylene antibacterial and antifogging film with the transparent antistatic layer is obtained by sequentially carrying out sheet casting, transverse stretching, longitudinal stretching and heat treatment.
Furthermore, the multilayer co-extruder adopts one of five layers or seven layers, and the width of the production line for the biaxially oriented polyethylene antibacterial and antifogging film is 8.5-9m, so that compared with the prior art, the output of the extruder is higher, the extrusion capacity and the output are large, the output per hour is more than 4 tons, and the production efficiency is higher.
Furthermore, the production speed of the production line is not lower than 400m/min, compared with the prior art, the production line speed is higher, the yield is high and stable, the broken film is less, and the optical and mechanical properties are excellent.
Further, biaxial stretching polyethylene antibiotic antifog film includes the sandwich layer, the surface all is connected with the sublayer about the sandwich layer, two the one end that the sublayer kept away from each other all is connected with the extexine, transparent static electricity eliminating layer sets up between sublayer and extexine, through transparent static electricity eliminating layer, can effectively eliminate the off-the-shelf static of this film on the one hand, convenient to use, on the other hand can effectively improve the joint strength between sublayer and the extexine through transparent static electricity eliminating layer to effectively improve when using, the wholeness between each part, the foaming condition of blowing takes place effectively between each part.
Further, the thickness of the subsurface layer is 3-7 μm, and the thickness of the external layer is 1-2 μm.
Further, the homogenization diaphragm spheres comprise outer sphere coatings, magnetized transparent crystal grains are filled in the outer sphere coatings, and the homogenization diaphragm spheres between two adjacent die heads can be adsorbed mutually through the magnetized transparent crystal grains, so that the homogenization diaphragm spheres are adsorbed mutually, the two die heads are under the action of adsorption force, the inner walls close to each other are distributed along the wall, a transparent static eliminating layer can be distributed between the subsurface layer and the external surface layer, and meanwhile, the mechanical property of the finished film can be effectively improved.
Further, outer ball covering is made for the polyethylene material, and outer ball covering wherein one end be the plane setting, and the outer ball covering adherence of being convenient for distributes, makes its in-process at adherence downstream, is difficult for taking place to shift, and is whole comparatively steady for the transparent static electricity layer that disappears that forms is more even.
Further, the transparent crystalline grain of magnetization includes a plurality of mutual absorption's transparent crystalline block, one of them outer end fixedly connected with of transparent crystalline block owner toughness fibre, a plurality of side toughness fibre of the fibrous tip fixedly connected with of owner toughness, on the one hand through main toughness fibre and the fibrous setting of side toughness, can form the connecting piece effect between sublayer and extexine, can effectively improve the joint strength between the two, can effectively improve the toughness of the film that forms simultaneously, make it be difficult for breaking, and then effectively improve its mechanical properties, on the other hand, under the effect of transparent crystalline block, can also reach the effect of preventing static, convenient to use.
Further, transparent crystal piece inside is filled with transparent magnetic powder and prevents the mixture of static granule according to the isometric ratio, is convenient for homogenize the diaphragm ball through transparent magnetic powder and distributes adherent to each other to effectively guarantee the even formation on transparent static electricity eliminating layer, and transparent magnetic powder has good light transmissivity, and cooperation transparent crystal piece multiaspect effect can effectively improve the light transmissivity and the optical property of this film, can effectively guarantee this film off-the-shelf antistatic effect through preventing the static granule, makes the result of use better.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) this scheme can realize high production speed and output, the film of this technology production has antifogging property and high mechanics and optical property simultaneously, in process of production, through the setting of homogenization diaphragm ball, can be in the inner wall adherent distribution of the head of being close to each other, and move down, when through the homogenization distributor, heat for the homogenization distributor, thereby can form one deck interlayer between extrusion material and the outer extrusion material including, make and form transparent static electricity eliminating layer between the sublayer and the extexine of the film that forms, can effectively eliminate the off-the-shelf static electricity of this film on the one hand, convenient to use, on the other hand, can effectively improve the joint strength between sublayer and the extexine through transparent static electricity eliminating layer, show to improve its mechanical property, can effectively improve the optical property of this film simultaneously.
(2) The multilayer co-extruder adopts one of five layers or seven layers, and the width of a production line for biaxially oriented polyethylene antibacterial and antifogging film is 8.5-9m, so that compared with the prior art, the extruder has the advantages of higher output, large extrusion capacity and output, the output per hour is more than 4 tons, and the production efficiency is higher.
(3) The production speed of the production line is not lower than 400m/min, compared with the prior art, the production line has higher speed, high and stable yield, less broken membranes and excellent optical and mechanical properties.
(4) Biaxial stretching polyethylene antibiotic antifog film includes the sandwich layer, the surface all is connected with the sublayer about the sandwich layer, the one end that two sublayers kept away from each other all is connected with the extexine, transparent static electricity eliminating layer sets up between sublayer and extexine, through transparent static electricity eliminating layer, can effectively eliminate the off-the-shelf static of this film on the one hand, convenient to use, on the other hand, can effectively improve the joint strength between sublayer and the extexine through transparent static electricity eliminating layer, thereby effectively improve when using, wholeness between each part, the foaming condition of blowing takes place effectively to avoid between each part.
(5) The thickness of the subsurface layer is 3-7 μm, and the thickness of the external layer is 1-2 μm.
(6) The homogenization diaphragm ball includes the outer ball covering, and outer ball covering is inside to be filled with the transparent crystalline grain of magnetization, is convenient for through the transparent crystalline grain of magnetization the homogenization diaphragm ball between two adjacent die heads can adsorb each other to make the two under the adsorption affinity, thereby the inner wall adherence that is close to each other at two die heads distributes, and the transparent static electricity layer of being convenient for can distribute between sublayer and extexine, can effectively improve this film finished product's mechanical properties simultaneously.
(7) The outer ball covering is made for the polyethylene material, and outer ball covering wherein one end be the plane setting, and the outer ball covering adherence of being convenient for distributes, makes its in-process at adherence downstream, is difficult for taking place to shift, and is whole comparatively steady for the transparent static electricity layer that disappears that forms is more even.
(8) Transparent crystalline grain of magnetization includes a plurality of mutual adsorbed transparent crystalline masses, one of them outer end fixedly connected with of transparent crystalline mass owner toughness fibre, a plurality of side toughness fibre of the fibrous tip fixedly connected with of owner toughness, on the one hand, through main toughness fibre and the fibrous setting of side toughness, can form the connecting piece effect between sublayer and extexine, can effectively improve the joint strength between the two, can effectively improve the toughness of the film that forms simultaneously, make it be difficult for breaking, and then effectively improve its mechanical properties, on the other hand, under the effect of transparent crystalline mass, can also reach the effect of preventing static, and convenient to use.
(9) Transparent crystal piece inside is filled with transparent magnetic powder and prevents the mixture of static granule according to the isometric ratio, is convenient for the mutual adherence of homogenization diaphragm ball through transparent magnetic powder and distributes, thereby effectively guarantees the even formation on transparent static layer that disappears, and transparent magnetic powder has good light transmissivity, cooperates transparent crystal piece multiaspect effect, can effectively improve the light transmissivity and the optical property of this film, can effectively guarantee this film off-the-shelf static effect of preventing through preventing the static granule, makes the result of use better.
Drawings
FIG. 1 is a principal flow diagram of the present invention;
FIG. 2 is a schematic structural diagram of a finished film product of the present invention;
FIG. 3 is a schematic view of the structure of the end of the multilayer coextruder of the present invention;
FIG. 4 is a schematic view of the structure at A in FIG. 3;
FIG. 5 is a schematic diagram of the structure of a homogenizing diaphragm ball of the present invention;
FIG. 6 is a schematic structural diagram of a magnetized transparent grain portion according to the present invention.
The reference numbers in the figures illustrate:
1 outer spherical cladding, 2 magnetized transparent crystal grains, 21 transparent crystal blocks, 22 main flexible fibers and 23 side flexible fibers.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1, the multi-layer co-extrusion production process of the biaxially oriented polyethylene antibacterial and antifogging film comprises the following steps:
s1, firstly, crushing the polyethylene, and drying to obtain a master batch for later use;
s2, adding an antistatic agent and an antifogging agent into a part of polyethylene master batch to obtain an inner extrusion material;
s3, mixing a polyethylene heat sealing material and a delustering material, adding an antifogging agent, an antibacterial material and an antisticking agent, uniformly mixing to obtain an outer extrusion material, and adding homogenizing diaphragm balls into the outer extrusion material and part of the inner extrusion material;
s4, referring to the figures 3-4, wherein a represents an inner extrusion material, b represents an outer extrusion material, c represents an interlayer, d represents a homogenizing distributor, different inner extrusion materials and outer extrusion materials are respectively put into five different die heads of the multilayer co-extruder, the inner extrusion material without a homogenizing diaphragm ball is put into the die head in the middle of the multilayer co-extruder, the inner extrusion material with the homogenizing diaphragm ball is put into the die heads at two sides of the die head in the middle of the multilayer co-extruder, and the outer extrusion materials are put into the two die heads at the outermost sides;
s5, absorbing the homogenized diaphragm balls in a plurality of die heads of the multilayer co-extruder mutually to adsorb each other and arrange the homogenized diaphragm balls close to each other by attaching the inner walls of the die heads, moving the homogenized diaphragm balls downwards, heating the homogenized diaphragm balls by the homogenized distributor when the homogenized diaphragm balls pass through the homogenized distributor to gradually dissolve the homogenized diaphragm balls, forming a layer of interlayer between the inner extrusion material and the outer extrusion material, effectively ensuring that the inner extrusion material and the outer extrusion material are not easy to be mutually crossed, effectively improving the stability between the layers and ensuring that the obtained film has better quality, and then sequentially carrying out sheet casting, transverse stretching, longitudinal stretching and heat treatment, please refer to figure 2, and finally obtaining the biaxially oriented polyethylene anti-fog film with the transparent antistatic layer.
The multilayer co-extruder adopts one of five layers or seven layers, the width of a production line for biaxially oriented polyethylene antibacterial and antifogging film is 8.5-9m, so that compared with the prior art, the extruder is higher in yield, large in extrusion capacity and yield, higher in production efficiency and higher in production speed of not less than 400m/min, the production line is higher in speed, higher in yield and stable, the film breaking amount is less, and the optical and mechanical properties are superior.
Referring to fig. 2, the biaxially oriented polyethylene antibacterial and antifogging film comprises a core layer, the upper surface and the lower surface of the core layer are both connected with sub-surface layers, one ends of the two sub-surface layers, which are far away from each other, are both connected with an outer surface layer, and a transparent static electricity eliminating layer is arranged between the sub-surface layers and the outer surface layer, so that on one hand, the static electricity of the finished film can be effectively eliminated through the transparent static electricity eliminating layer, the film is convenient to use, on the other hand, the connection strength between the sub-surface layers and the outer surface layer can be effectively improved through the transparent static electricity eliminating layer, thereby effectively improving the integrity between each part when in use, and effectively avoiding the occurrence of air blowing and foaming between each part, the thickness of the sub-surface layer is 3-7 μm, and the thickness of the outer surface layer is 1-2 μm.
Referring to fig. 5, the homogenized diaphragm beads include an outer bead cladding 1, the inner portion of the outer bead cladding 1 is filled with magnetized transparent grains 2, the magnetized transparent grains 2 facilitate the homogenized diaphragm beads between two adjacent die heads to be adsorbed to each other, so that the homogenized diaphragm beads and the outer bead cladding are under the action of adsorption force, and the inner walls of the two die heads close to each other are distributed along the wall, so that the transparent antistatic layer can be distributed between the subsurface layer and the outer surface layer, and meanwhile, the mechanical property of the finished film can be effectively improved, the outer bead cladding 1 is made of polyethylene material, one end of the outer bead cladding 1 is arranged in a plane, the outer bead cladding 1 is distributed along the wall, so that the outer bead cladding 1 is not easy to shift in the process of moving downwards along the wall, the whole is stable, and the formed transparent antistatic layer is more uniform.
Referring to fig. 6, the magnetized transparent crystal grain 2 includes a plurality of transparent crystal blocks 21 adsorbed to each other, one outer end of each of the transparent crystal blocks 21 is fixedly connected with a main flexible fiber 22, and an end portion of the main flexible fiber 22 is fixedly connected with a plurality of side flexible fibers 23, so that on one hand, a connecting member function can be formed between the sub-surface layer and the outer surface layer through the arrangement of the main flexible fiber 22 and the side flexible fibers 23, thereby effectively improving the connecting strength between the sub-surface layer and the outer surface layer, and simultaneously, the toughness of the formed film can be effectively improved, so that the film is not easy to break, and further, the mechanical properties of the film can be effectively improved, on the other hand, under the action of the transparent crystal blocks 21, an anti-static function can be achieved, so that the film is convenient to use, the transparent crystal blocks 21 are filled with a mixture of transparent magnetic powder and anti-static particles according to an equal volume ratio, and the mutual wall-sticking distribution of the diaphragm spheres is facilitated to homogenize through the transparent magnetic powder, thereby effectively guarantee the even formation on transparent static electricity eliminating layer to transparent magnetic powder has good light transmissivity, and cooperation transparent crystal piece 21 multiaspect effect can effectively improve the light transmissivity and the optical property of this film, can effectively guarantee this film off-the-shelf antistatic effect through preventing the static granule, makes the result of use better.
Can realize high production speed and output, the film of this technology production has antifogging property and high mechanics and optical property simultaneously, in the production process, through the setting of homogenization diaphragm ball, can be in the inner wall adherence distribution of the touch head that is close to each other, and move down, when through the homogenization distributor, heat for the homogenization distributor, thereby can form one deck interlayer between extrusion material and the outer extrusion material including, make form transparent static electricity layer that disappears between the sublayer and the extexine of the film that forms, can effectively eliminate the off-the-shelf static electricity of this film on the one hand, convenient to use, on the other hand, can effectively improve the joint strength between sublayer and the extexine through transparent static electricity layer that disappears, show to improve its mechanical property, can effectively improve the optical property of this film simultaneously.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (5)
1. The multi-layer co-extrusion production process of the biaxially oriented polyethylene antibacterial antifogging film is characterized by comprising the following steps of: the method comprises the following steps:
s1, firstly, crushing the polyethylene, and drying to obtain a master batch for later use;
s2, adding an antistatic agent and an antifogging agent into a part of polyethylene master batch to obtain an inner extrusion material;
s3, mixing a polyethylene heat sealing material and a delustering material, adding an antifogging agent, an antibacterial material and an antisticking agent, uniformly mixing to obtain an outer extrusion material, and adding homogenizing diaphragm balls into the outer extrusion material and part of the inner extrusion material;
s4, respectively putting different inner extrusion materials and outer extrusion materials into five different die heads of a multilayer co-extruder, putting the inner extrusion materials without the homogenized diaphragm spheres into the die head in the middle, putting the inner extrusion materials with the homogenized diaphragm spheres into the die heads on two sides of the die head in the middle, and putting the outer extrusion materials into the two die heads on the outermost sides;
s5, mutually attracting the homogenized diaphragm spheres in a plurality of die heads of the multilayer co-extruder so as to be mutually adsorbed and arranged along the mutually close inner walls of the die heads, moving downwards, heating the homogenized distributor when passing through the homogenized distributor so as to gradually dissolve the homogenized diaphragm spheres, forming a layer of interlayer between an inner extrusion material and an outer extrusion material, and then sequentially carrying out sheet casting, transverse stretching, longitudinal stretching and heat treatment to obtain the biaxially oriented polyethylene antibacterial and antifogging film with the transparent antistatic layer; the homogenization diaphragm ball comprises an outer ball cladding (1), wherein the inner part of the outer ball cladding (1) is filled with magnetized transparent crystal grains (2); the outer ball cladding (1) is made of polyethylene materials, and one end of the outer ball cladding (1) is arranged in a plane; the magnetized transparent crystal grains (2) comprise a plurality of transparent crystal blocks (21) which are mutually adsorbed, one outer end of each transparent crystal block (21) is fixedly connected with a main flexible fiber (22), and the end part of each main flexible fiber (22) is fixedly connected with a plurality of side flexible fibers (23); the transparent crystal block (21) is filled with a mixture of transparent magnetic powder and antistatic particles according to an equal volume ratio.
2. The multi-layer co-extrusion production process of the biaxially oriented polyethylene antibacterial and antifogging film according to claim 1, characterized in that: the multilayer co-extruder adopts one of five layers or seven layers, and the width of a production line for the biaxially oriented polyethylene antibacterial and antifogging film is 8.5-9 m.
3. The multi-layer co-extrusion production process of the biaxially oriented polyethylene antibacterial and antifogging film according to claim 2, characterized in that: the production speed of the production line is not lower than 400 m/min.
4. The multi-layer co-extrusion production process of the biaxially oriented polyethylene antibacterial and antifogging film according to claim 1, characterized in that: the biaxially oriented polyethylene antibacterial and antifogging film comprises a core layer, the upper surface and the lower surface of the core layer are both connected with subsurface layers, two subsurface layers are connected with outer surface layers at the ends far away from each other, and the transparent antistatic layer is arranged between the subsurface layers and the outer surface layers.
5. The multi-layer co-extrusion production process of the biaxially oriented polyethylene antibacterial and antifogging film according to claim 4, characterized in that: the thickness of the subsurface layer is 3-7 μm, and the thickness of the external layer is 1-2 μm.
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| CN114905715B (en) * | 2022-02-11 | 2023-04-18 | 宿迁市金田塑业有限公司 | Preparation process and production equipment of biaxially oriented polypropylene dual-heat green protection film |
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