CN211074997U - Biaxial stretching polypropylene film preparation equipment - Google Patents
Biaxial stretching polypropylene film preparation equipment Download PDFInfo
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- CN211074997U CN211074997U CN201921806983.2U CN201921806983U CN211074997U CN 211074997 U CN211074997 U CN 211074997U CN 201921806983 U CN201921806983 U CN 201921806983U CN 211074997 U CN211074997 U CN 211074997U
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Abstract
The utility model discloses a biaxial stretching polypropylene film preparation device, which is characterized in that the film comprises a surface layer, a core layer and a functional layer, the biaxial stretching polypropylene film preparation device comprises an extruder, one side of the extruder is provided with a casting area for cooling, a longitudinal stretching area MDO and a transverse stretching area TDO; the surface of at least one roller of the longitudinal stretching area MDO is coated with a Teflon coating, and a far infrared heating structure is arranged in front of the MDO area; the utility model has the advantages that: the performance required by a five-layer structure of the material with the melting temperature higher than 80 ℃ is realized by utilizing a three-layer structure formed by the material with the melting temperature lower than 80 ℃; the problems of surface adhesion, functional layer damage, functional layer haze rise quality under a high-temperature condition, incomplete thick sheet preheating and diaphragm fracture under a low-temperature condition are solved by coating the MDO roller with Teflon.
Description
The technical field is as follows:
The utility model belongs to the technical field of film production facility, more specifically relates to a biaxial stretching polypropylene film preparation equipment.
Background art:
The biaxially oriented polypropylene film BOPP is an important plastic flexible package product, has the advantages of light weight, no toxicity, high stiffness, moisture resistance and the like, and is widely applied to packaging of food, medicine, cigarettes, wines and the like. One important application market is laminating printed products, namely laminating BOPP and printed paper prints to form a paper-plastic composite structure, so that the printed prints are protected against moisture, and the attractiveness is improved. The existing paper-plastic composite technology generally comprises an instant coating process and a pre-coating process;
Namely, the coating process is to coat glue containing a solvent on the film in the compounding process, form a glue layer on the surface of the film after being dried by an oven, and then compound the glue layer with paper by hot pressing through a hot pressing roller, wherein the process has the defects that 1, the solvent volatilizes to cause environmental problems; 2. the quality problems of poor compounding, foaming and the like of the film due to incomplete drying of the solvent are solved;
The precoating process is to coat the hot melt adhesive on the BOPP basal membrane in advance, but because the adhesion of the common hot melt adhesive such as acetic acid-vinyl acetate and other ethylene copolymers to the BOPP is not good, a layer of primer is required to be coated on the surface to improve the adhesion strength, and the problem that the color of the thin membrane is changed due to solvent volatilization and primer precipitation is still caused in the primer coating process, the invention provides a precoating membrane base material which can be directly compounded with the hot melt adhesive without the primer, and is urgent;
The patent of the invention of China discloses a bottomless coating film in CN102873953B, the bottomless coating film structure designed by the patent is a five-layer structure, and the defects of high production cost and complex process control exist;
In the production process of the bottomless coating film disclosed in the chinese invention patent CN102863919B, because the functional layer uses low density polyethylene, linear low density polyethylene, metallocene polyethylene, ethylene polar copolymer or any mixture thereof, in the actual production process, in the process of contacting with the longitudinal stretching roller, a series of serious quality problems affecting the subsequent processing, such as surface adhesion phenomenon, serious functional layer damage, functional layer haze increase and the like, can be generated due to high temperature on the roller surface, and if the temperature of the stretching roller is reduced, the thick sheet is not completely preheated, the high elastic state required by stretching cannot be fully achieved, the film sheet is broken, the thickness is not uniform, the production line speed cannot be increased and the like.
The invention content is as follows:
In order to solve the problems and overcome the defects of the prior art, the utility model provides a device for preparing a biaxial stretching polypropylene film,
The first technical problem to be solved is that: in the process of contacting with a longitudinal stretching roller in the actual production process, because the surface of the roller is high in temperature, the surface adhesion phenomenon can be generated, the functional layer can be seriously damaged, the haze of the functional layer is increased, and the like, which seriously affect the subsequent processing;
The second technical problem to be solved is that: the roller adopting the Teflon coating can relieve the first technical problem to a certain extent, but only materials with the melting temperature higher than 80 ℃ can be selected for selecting the material of the functional layer, and the materials with the high melting temperature can influence the composite strength of the bottomless coating base material and the EVA hot melt adhesive, so that the EVA coating is easy to peel off from the base material.
The utility model provides a concrete technical scheme of above-mentioned technical problem does: the biaxially oriented polypropylene film is characterized in that the total thickness of the film is 10-30 mu m, and the film comprises a surface layer, a core layer and a functional layer,
The main body of the surface layer is in two structural forms of homopolymerized polypropylene or extinction master batch, and the surface layer also contains an anti-sticking agent, a slipping agent and a stiffening agent, wherein the extinction master batch is a blend of polypropylene and polyethylene;
The core layer main body is homopolymerized polypropylene, and also contains an antistatic agent, a stiffness increasing agent and a slipping agent;
The functional layer main body is one or a mixture of more than two of low-density polyethylene, linear low-density polyethylene, metallocene polyethylene and ethylene polar copolymer; also comprises silicon dioxide, glass beads, silicate anti-blocking agents and amide or silicone slipping agents.
Furthermore, the homopolymerized polypropylene of the surface layer accounts for 95-99 percent of the mass fraction, the layer thickness is 0.5-3 mu m, and the anti-sticking agent is silicon dioxide or glass beads or silicate;
The thickness of the extinction master batch layer is 0.5-3 mu m;
The thickness of the core layer is 4-29 μm; comprises 70-100% of homopolymerized polypropylene by mass percent, and the balance of antistatic agent, slipping agent and stiffness increasing agent;
The functional layer has a thickness of 0.5-3 μm, and comprises 95-99.5 wt% of one or more of low density polyethylene, linear low density polyethylene, metallocene polyethylene and ethylene polar copolymer, and the balance of silica, glass beads or silicate anti-blocking agent or amide or silicone slipping agent.
The biaxially oriented polypropylene film preparation equipment is prepared by biaxially oriented polypropylene film preparation equipment and comprises an extruder, wherein the extruder is provided with a T-shaped die head, one side of the extruder is provided with a casting area for cooling, a longitudinal stretching area MDO and a transverse stretching area TDO for stretching and forming;
The longitudinal stretching area MDO and the transverse stretching area TDO comprise rollers with preset number; the surface of at least one roller of the longitudinal stretching area MDO is coated with a Teflon coating, and a far infrared heating structure is arranged in front of the transverse stretching area TDO.
Furthermore, the thickness of the Teflon coating is 30-100 μm, and the roughness Ra is less than or equal to 0.1.
The utility model has the advantages that:
The performance required by a five-layer structure of the material with the melting temperature higher than 80 ℃ is realized by utilizing a three-layer structure formed by the material with the melting temperature lower than 80 ℃;
The problems of surface adhesion, functional layer damage and functional layer haze rise quality under a high-temperature condition, incomplete thick sheet preheating and diaphragm fracture under a low-temperature condition are solved by coating the MDO roller with Teflon;
The high elastic state formed by preheating the thick sheet from inside to outside through the combination of the Teflon-coated roller and far infrared heating is realized, and the use temperature of the roller can be improved in the processing process, so that the selection range of the material of the functional layer is expanded, namely the material with the melting point below 80 ℃ can be selected, and the adhesion of the final product to the precoating film hot melt adhesive layer is improved.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the roller of the present invention;
FIG. 3 is a schematic structural view of a biaxially oriented polypropylene film of the utility model; in the drawings:
1. The manufacturing process comprises an extruder, 2 parts of a casting area, 3 parts of a far infrared heating structure, 4 parts of a longitudinal stretching area MDO, 5 parts of a transverse stretching area TDO, 6 parts of a tractor, 7 parts of a rolling structure, 8 parts of a surface layer, 9 parts of a core layer, 10 parts of a functional layer, 11 parts of a roller and 12 parts of a Teflon coating.
The specific implementation mode is as follows:
Specific details are set forth in the description of the invention only to provide a thorough understanding of the embodiments of the invention, but as one skilled in the art will appreciate, the practice of the invention is not limited to these details. In other instances, well-known structures and functions have not been described or shown in detail to avoid obscuring the points of the embodiments of the present invention. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The utility model discloses a concrete implementation mode:
firstly, premixing selected raw materials according to formula design requirements in sequence, putting the premixed raw materials into a feeding system of a corresponding extruder 1, and conveying the premixed raw materials to the corresponding extruder 1 after metering;
② the extruder 1 to form uniform melt, filtering the melt by a filter, conveying the melt to a T-shaped die head for co-extrusion, and cooling the melt by a casting area 2 to form a thick sheet;
preheating the thick plate by a far infrared heating structure 3, and heating the thick plate from inside to outside to form a high elastic state;
The preheated slab is stretched to generate a film through a heating roller 11 with a transverse stretching area TDO5 of the Teflon coating 12; at the moment, the thick sheet is heated from inside to outside to form a high elastic state, so that the Teflon coating 12 of the MDO roller is coated, the problems of surface adhesion and functional layer damage under a high temperature condition, functional layer haze rise quality rise, incomplete thick sheet preheating under a low temperature condition and diaphragm fracture are effectively solved, meanwhile, the temperature of the MDO roller can be further reduced, the tension and elasticity required by stretching can be obtained at a lower temperature, and the effects of no adhesion, no damage and no fracture are obtained; the material with the melting point below 80 ℃ can be selected, so that the adhesion of the final product to the pre-coated film hot melt adhesive layer is improved, and the possibility of performance required by a five-layer structure of the material with the melting temperature higher than 80 ℃ is realized by utilizing a three-layer structure formed by setting the material with the melting temperature lower than 80 ℃;
④, the stretched film is treated by corona or flame to improve the surface tension and increase the surface polarity;
and fifthly, winding the treated film into a mother roll through a traction machine 6 and a winding structure 7 for aging treatment, and then slitting the film into products according to the requirements of customers.
Example 1 light type
The 3-layer co-extrusion biaxially oriented polypropylene film is produced on a BOPP production line and has the following structure:
Total film thickness of 15 μm
Preparing the surface layer 8 material: 95% by mass of film grade homo-polypropylene, such as medium petrochemicals F03D, T36F, etc., and 5% by mass of antiblocking agent, such as Schumann AB905 or Constantam AB 6018;
The core layer 9 is made of: 98% of film grade homopolymerized polypropylene and 2% of antistatic agent 2335;
Wherein the thickness of the surface layer 8 is 1.5 μm, the thickness of the core layer 9 is 12 μm, and the thickness of the functional layer 10 is 1.5 μm;
Through the utility model discloses production facility makes finished product 1, and the performance is as follows: density: 0.905g/m 3(ii) a Heat shrinkage (machine/transverse direction): 4.9/0.8; surface tension: 43 mN/m; the functional layer 10 on the film surface has no adhesion damage.
Example 2 matte type
The 3-layer co-extrusion biaxially oriented polypropylene film is produced on a BOPP production line and has the following structure:
The total thickness of the film is 15 mu m;
The core layer 9 is made of: 96% of film grade homopolymerized polypropylene, 3% of smooth master batch and 2% of antistatic agent;
Wherein the thickness of the surface layer 8 is 2.5 μm, the thickness of the core layer 9 is 10.5 μm, and the thickness of the functional layer 10 is 2 μm;
The finished product 1 is manufactured by the production equipment of the utility model; the properties were as follows: density: 0.905g/m 3(ii) a Heat shrinkage (machine/transverse direction): 4.9/0.8; surface tension: 43 mN/m; the functional layer 10 on the film surface is not adhered and damaged;
Example 3: matte type contrast 1
The 3-layer co-extrusion biaxially oriented polypropylene film is produced on a BOPP production line and has the following structure:
The total thickness of the film is 15 mu m; surface layer 8 material: the mass fraction is 100% of extinction master batch; the core layer 9 is made of: 96% of film grade homopolymerized polypropylene, 3% of smooth master batch and 2% of antistatic agent; functional layer 10 material: the weight percentage of the polyethylene is 70 percent, the special vinyl polymer with the weight percentage of 20 percent is added, and the weight percentage of the ethylene-vinyl acetate is 10 percent;
Wherein the thickness of the surface layer 8 is 2.5 μm, the thickness of the core layer 9 is 10.5 μm, and the thickness of the functional layer 10 is 2 μm;
The production equipment of the utility model is utilized to remove far infrared heating, and only the heating roller is utilized to heat, thus obtaining a finished product 3; the properties were as follows: density: 0.905g/m 3(ii) a Heat shrinkage (machine/transverse direction): 4.9/0.8; surface tension: 43 mN/m; the functional layer 10 on the film surface is adhered and damaged;
Example 4: comparative example 2
Taking a common BOPP15 mu m bright film and adding primer AC to obtain a finished product 4;
The following pre-coating production process is adopted to carry out pre-coating preparation on a finished product 1/2/3 film roll, the thickness of the coating is 12 mu m,
The temperature of the extruder 1 is 200-240 ℃; die temperature: 220 to 230 ℃; carrying out ozone treatment; the production line speed is 130M/min; the prepared precoating film is coated with white cardboard to prepare a corresponding sample 1/2/3;
Example 5: comparison 3
Coating white cardboard on a common BOPP 15-micron matte film by using laminating glue to prepare a comparison sample 4;
The film covering conditions are all 105 ℃, the pressure is 180KPa, and the time is 0.5 second; measuring the adhesive force between the film and the paper by 180-degree stripping;
Table 1: film to paper peel force comparison data
From the results, the precoating film base material with the three-layer structure designed by the real patent can be directly adhered to a hot melt adhesive layer without a primer to prepare a precoating film, the film surface quality is good, the condition that a film surface functional layer is adhered and damaged does not exist in the production process, the prepared precoating film has excellent performance in a downstream paper plastic coating process, and the market feedback is good; and only the roller of the Teflon coating layer 12 is utilized, far infrared non-contact heating is not utilized, and the produced film is not easy to peel off under the same condition, and the functional layer of the film surface is adhered and damaged.
Claims (2)
1. The equipment for preparing the biaxially oriented polypropylene film is characterized in that the total thickness of the biaxially oriented polypropylene film is 10-30 mu m, and the biaxially oriented polypropylene film comprises a surface layer (8), a core layer (9) and a functional layer (10), wherein the layer thickness of the surface layer (8) is 0.5-3 mu m, and the layer thickness of the core layer (9) is 4-29 mu m; the functional layer (10) has a layer thickness of 0.5 to 3 μm,
The preparation equipment of the biaxially oriented polypropylene film comprises an extruder (1), wherein the extruder (1) is provided with a T-shaped die head, one side of the extruder (1) is provided with a casting area (2) for cooling, a longitudinal stretching area MDO (4) and a transverse stretching area TDO (5) for stretching and forming;
The areas of the longitudinal stretching area MDO (4) and the transverse stretching area TDO (5) comprise a preset number of rollers (11); the surface of at least one roller (11) of the longitudinal stretching area MDO (4) is coated with a Teflon coating (12), and a far infrared heating structure (3) is arranged in front of the transverse stretching area TDO (5).
2. The apparatus for producing a biaxially oriented polypropylene film according to claim 1, wherein: the thickness of the Teflon coating (12) is 30-100 mu m, and the roughness Ra is less than or equal to 0.1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921806983.2U CN211074997U (en) | 2019-10-25 | 2019-10-25 | Biaxial stretching polypropylene film preparation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921806983.2U CN211074997U (en) | 2019-10-25 | 2019-10-25 | Biaxial stretching polypropylene film preparation equipment |
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| Publication Number | Publication Date |
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| CN211074997U true CN211074997U (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921806983.2U Active CN211074997U (en) | 2019-10-25 | 2019-10-25 | Biaxial stretching polypropylene film preparation equipment |
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| CN (1) | CN211074997U (en) |
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