WO2018176770A1 - Bopp pearlized film and manufacturing method therefor - Google Patents

Abstract

A BOPP pearlized film and a manufacturing method therefor. The BOPP pearlized film comprises three layers, i.e., layers A, B, and C. Layers A and C are surface layers, and layer B is a core layer; surface layer A consists of 85-90% of chlorinated polyethylene, 5% of polyethylene, 3% of polypropylene, and 1-4% of an antioxidant, with the balance being pearl powder; the core layer B consists of 50% of polypropylene, 30% of pearl powder, and 2-5% of an antistatic agent, with the balance being an antioxidant; the surface layer C consists of 30-56% of polystyrene, 20-35% of an epoxy resin, 10-20% of a heat stabilizer, 5-15% of an antistatic agent, 3-5% of an antioxidant, and 10-15% of ethylene glycol distearate, with the balance being a slipping agent. The pearlized film has a simple structure, is convenient to operate, and has low manufacturing costs; the yield loss during the manufacturing process is low; the product has a beautiful appearance and good performance.

Description

BOPP pearl film and manufacturing method thereof

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 201710207331.6, entitled "BOPP Pearl Film and Its Manufacturing Method", filed on March 31, 2017, the entire contents of which is incorporated herein by reference. in.

Technical field

The invention relates to a pearlescent film and a manufacturing method thereof, in particular to a BOPP pearlescent film and a manufacturing method thereof.

Background technique

The pearlescent film is made of a polypropylene resin as a raw material, added with calcium carbonate, a pearlescent pigment, etc., and is mixed and biaxially stretched. Since the mechanical foaming method is adopted, the specific gravity of the pearlescent film is only about 0.7, and the specific gravity of the PP is about 0.9, so the soft packaging enterprise is willing to use it because of its low cost, good decoration and excellent performance. Generally, the BOPP pearl film of the composite structure is often used in cold drink packaging such as ice cream, heat seal label, sweet food, biscuit, flavor snack packaging, etc. due to its certain pearlescent effect. In the long-term production process, it is found that the manufacturing cost of the pearl film is high, and the defective rate is high.

Summary of the invention

The present invention is directed to the deficiencies in the background art: a BOPP pearlescent film and a method of manufacturing the same are provided.

The object of the present invention is achieved by the following means:

A BOPP pearl film comprising three layers A, B and C, wherein the A and C layers are surface layers, B is a core layer, and the surface layer A is 85-90% chlorinated polyethylene, 5% polyethylene, 3% poly Propylene, 1-4% antioxidant and residual pearl powder, the core layer B is 50% polypropylene, 30% pearl powder, 2-5% antistatic agent and residual antioxidant, the surface layer C is 30- 56% polystyrene, 20-35% epoxy resin, 10-20% heat stabilizer, 5-15% antistatic agent, 3-5% antioxidant, 10-15% pearlescent diester and remaining smooth Agent.

The thickness distribution of each of the layers A, B, and C: the thickness of the surface layer A is 0.7-2.4 micrometers, the thickness of the core layer B is 5-7 micrometers, and the thickness of the surface layer C is 1-3 micrometers.

The antioxidant is p-phenylenediamine, dihydroquinoline, trioctyl ester, tridecyl ester or 2,6-tributyl-4-methylphenol.

The antistatic agent is an anionic antistatic agent.

The main components of the slip agent are α-amylase preparation, β-glucosidase, sodium alkylbenzene sulfonate and gum arabic.

A method for manufacturing a BOPP pearl film comprises the following steps: (1) filtering the raw material, which will be used for the surface layer A, The raw materials of the core layer B and the surface layer C are filtered twice by a filter screen to drive out the filtered impurities; (2) the mixture is stirred, and the raw materials for forming the surface layer A, the core layer B and the surface layer C are respectively placed in the mixer. Mixing is carried out, stirring time is 3-5 minutes, (3) secondary filtration, the raw materials after mixing and mixing are secondarily filtered with a filter sieve, filtered and placed in an extruder respectively; (4) melt extrusion Before the secondary filtered mixed raw material is placed in the extruder, the extruder is preheated in advance, and when the temperature of the heating zone is 180-210 ° C, the mixed raw material is placed in the extruder during the melting process. The raw material is plasticized and kneaded under the action of the extruder, and the water on the raw material is sucked out through the two exhaust ports of the third and fifth heating zones, the air is discharged by a vacuum pump, and the raw material is melted and passed through the metering pump. Entering the filter and then entering the die; (5) casting the melt, the melt flows out in three layers in the die, the die temperature is 225-260 ° C, and then cooled by the cold water in the casting roll to form a thick piece. The surface temperature of the slab roll is 5-12 ° C, (6) longitudinal stretching, before the longitudinal stretching, the thick piece After preheating by the preheating roller, it enters the longitudinal stretching machine and performs longitudinal stretching for 3-6 times, and stretches it into a thin sheet, (7) transversely stretching, and the sheet is longitudinally stretched and then enters the transverse stretching machine for 3 -6 times of transverse stretching, and then enter the shaping zone for secondary cooling, (8) traction trimming, and then before the trimming, before inspection, check the sheet with the inspection device or the naked eye to see if There is 瑕疵, if it exists, whether it can be repaired during the process of traction trimming, and then trimming, the waste generated during the trimming process is sent to the pulverizer for smashing, (9) winding, after cutting and finishing The winding device performs winding, (10) slitting, and then the unwinding film is unwound, and after the film is laid in the unwinding process, the slitting device is used for slitting according to a predetermined size, (11) acceptance, After the slitted film is inspected and accepted, the qualified packaging is accepted, and the acceptance is unqualified, and (12) the products that have passed the acceptance are packaged and finally put into storage.

The beneficial effects of the invention:

The invention has the advantages of simple structure, convenient operation, low manufacturing cost, low defect rate generated in the manufacturing process, beautiful appearance and good performance.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the specific embodiments, but those skilled in the art will understand that the embodiments described below are a part of the embodiments of the present invention, but not all of the embodiments, only The invention is illustrated and should not be construed as limiting the scope of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. Those who do not specify the specific conditions in the examples are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are conventional products that can be obtained by commercially available purchase.

One embodiment of the present invention provides a BOPP pearl film comprising three layers of A, B, and C, wherein the A and C layers are surface layers, B is a core layer, and the surface layer A is 85-90% chlorinated polyethylene. 5% polyethylene, 3% polypropylene, 1-4% antioxidant and residual pearl powder, the core layer B is 50% polypropylene, 30% pearl powder, 2-5% antistatic agent and residual anti-oxidation The surface layer C is 30-56% polystyrene, 20-35% epoxy resin, 10-20% heat stabilizer, 5-15% antistatic agent, 3-5% Antioxidant, 10-15% pearlescent diester and residual slip agent.

Another embodiment of the present invention provides a BOPP pearl film comprising three layers of A, B, and C which are sequentially stacked, wherein A and C layers are surface layers, and B is a core layer; Made of 85-90% chlorinated polyethylene, 5% polyethylene, 2-4% polypropylene, 1-4% antioxidant and the balance pearl powder, the core layer B is mainly composed of 45-55% polypropylene , 25-35% pearl powder, 2-5% antistatic agent and the balance of antioxidants, the surface layer C is mainly composed of 30-50% polystyrene, 20-35% epoxy resin, 10-20% It is made of heat stabilizer, 5-15% antistatic agent, 3-5% antioxidant, 10-15% pearlescent diester and balance slip agent.

Further, in an optional embodiment of the present invention, the surface layer A is mainly composed of 85-90% chlorinated polyethylene, 5% polyethylene, 3% polypropylene, and 1-4% anti-% by weight. Oxygen agent and balance pearl powder.

Further, in an optional embodiment of the present invention, the surface layer A is mainly composed of 87% chlorinated polyethylene, 6% polyethylene, 3% polypropylene, 2% antioxidant, and the like. Made of pearl powder.

Further, in an optional embodiment of the present invention, the core layer B is mainly composed of 50% polypropylene, 30% pearl powder, 2-5% antistatic agent and the balance antioxidant. production.

Further, in an optional embodiment of the present invention, the core layer B is mainly made of 50% polypropylene, 30% pearl powder, 3% antistatic agent and the balance antioxidant. .

Further, in an optional embodiment of the present invention, the surface layer C is mainly composed of 30-50% polystyrene, 20-35% epoxy resin, 10-20% heat stabilizer, or percentage by weight, 5-15% antistatic agent, 3-5% antioxidant, 10-15% pearlescent diester and balance slip agent.

Further, in an optional embodiment of the present invention, the surface layer C is mainly composed of 30-40% polystyrene, 20-30% epoxy resin, 10-15% heat stabilizer, or percentage by weight, It is made of 5-10% antistatic agent, 3-5% antioxidant, 10-12% pearlescent diester and balance slip agent.

Further, in an optional embodiment of the present invention, the thickness distribution of each of the layers A, B, and C: the thickness of the surface layer A is 0.7-2.4 micrometers, the thickness of the core layer B is 5-7 micrometers, and the thickness of the surface layer C. It is 1-3 microns.

Further, in an optional embodiment of the present invention, the surface layer A has a thickness of 1-2.4 μm, the core layer B has a thickness of 5-7 μm, and the surface layer C has a thickness of 1-3 μm.

Further, in an optional embodiment of the present invention, the surface layer A has a thickness of 2 to 2.4 μm, the core layer B has a thickness of 5 μm, and the surface layer C has a thickness of 2-3 μm.

Further, in an optional embodiment of the present invention, the antioxidant comprises a solvent selected from the group consisting of p-phenylenediamine, dihydroquinoline, trioctyl ester, tridecyl ester or 2,6-tertiary butyl- At least one of the group consisting of 4-methylphenol.

Further, in an optional embodiment of the invention, the antistatic agent is an anionic antistatic agent.

Further, in an optional embodiment of the present invention, the main component of the slip agent comprises a group selected from the group consisting of an α-amylase preparation, β-glucosidase, sodium alkylbenzene sulfonate and gum arabic. At least one of them.

An optional embodiment of the present invention further provides a method for manufacturing a BOPP pearl film, comprising the following steps:

(1) The raw materials were filtered, and the raw materials for producing the surface layer A, the core layer B, and the surface layer C were respectively filtered at least twice with a filter sieve to drive off the filtered impurities.

Alternatively, the raw materials for forming the surface layer A, the core layer B, and the surface layer C are separately filtered twice by a filter screen.

(2) Mixing and stirring, the raw materials for preparing the surface layer A, the core layer B, and the surface layer C are respectively placed in a mixer and stirred for mixing, and the stirring time is 3-5 minutes.

If there are a plurality of mixers, the materials used for the production of the surface layer A, the core layer B and the surface layer C can be mixed and stirred at the same time. If the number of mixers is not enough, it needs to be done in sequence.

(3) Secondary filtration, the raw materials after the mixing of the mixture are separately filtered by a filter sieve, filtered, and placed in an extruder.

Alternatively, if the purity of the feedstock is desired to be higher, it can be filtered again after secondary filtration.

(4) melt extrusion, before the secondary filtration of the mixed raw materials corresponding to the surface layer A, the core layer B and the surface layer C are placed in the extruder, the extruder is preheated in advance, when the temperature of the heating zone is 180 At -210 ° C, the mixed raw materials are placed in an extruder. During the melting process, the mixed raw materials are plasticized and kneaded under the action of the extruder, and two exhaust gases are passed through the third and fifth heating zones. The mouth sucks out the moisture on the raw material, and the air is discharged by a vacuum pump, and the mixed raw material is melted and then enters the filter through the metering pump, and then enters the touch head.

Wherein, the extruder has first, second, third, fourth and fifth heating zones arranged in sequence along the advancement direction of the material.

(5) Casting, the melt flows out in three layers in the die, the temperature of the die is 225-260 ° C, and then cooled by the cold water in the casting roll to form a thick piece. The surface temperature of the casting roll is 5-12. °C. In an alternative embodiment of the present invention, the die adopts a three-layer co-extrusion die, and the mixed raw materials corresponding to the surface layer A, the core layer B and the surface layer C are processed in an extruder and then extruded through a three-layer co-extrusion die. After cooling, a solid slab having a surface layer A, a core layer B and a surface layer C is formed. That is to say, the mixed raw materials corresponding to the surface layer A, the core layer B and the surface layer C are independently processed in the extruder, and then a three-layer composite structure is formed at the three-layer co-extrusion die.

(6) Longitudinal stretching, before the longitudinal stretching, the slab is preheated by a preheating roll, and then taken into a longitudinal stretching machine for longitudinal stretching for 3-6 times, which is stretched into a sheet.

(7) Lateral stretching, the sheet is longitudinally stretched and then placed in a transverse stretching machine for 3-6 times of transverse stretching, and then re-entered into the setting zone for secondary cooling.

Further, in an optional embodiment of the present invention, the method further comprises the step of pulling and trimming after the transverse stretching (8): before the trimming of the trimming, the inspection is performed in advance, and the inspection device or the naked eye is used. The sheet is inspected. If there is flaw, it can be repaired during the process of pulling and trimming, and then trimming is performed. The waste generated during the trimming process is sent to the crusher for crushing.

Further, in an optional embodiment of the present invention, the winding step (9) is performed after the trimming of the trimming, and the winding is performed by the winding device after the trimming is completed.

Further, in an optional embodiment of the present invention, the method further comprises a slitting step (10) performed after the winding, the unwinding of the film is unwound, and after the film is laid in the unwinding process The slitting device is used for slitting according to a predetermined size.

Further, in an optional embodiment of the present invention, a method for manufacturing a BOPP pearl film comprises the following steps: (1) raw material filtration, which is used for preparing the surface layer A, the core layer B and the surface layer C. The filter screen is filtered one by one to remove the filtered impurities; (2) the mixture is stirred, and the raw materials for preparing the surface layer A, the core layer B and the surface layer C are respectively placed in a mixer for mixing and stirring, and the stirring time is 3 5 minutes, (3) secondary filtration, the raw materials after the mixing and mixing are filtered by a filter screen, filtered and placed in an extruder; (4) melt extrusion, mixing after secondary filtration Before the raw material is placed in the extruder, the extruder is preheated in advance. When the temperature of the heating zone is 180-210 ° C, the mixed raw materials are placed in the extruder. During the melting process, the raw materials are used in the extruder. Plasticizing and kneading, and sucking out moisture on the raw material through two exhaust ports of the third and fifth heating zones, the air is discharged by a vacuum pump, and the raw material is melted and then enters the filter through the metering pump, and then enters the die; (5) Casting, the melt flows out in three layers in the die, the temperature of the die 225-260 ° C, after cooling through the cold water in the slab roll to form a thick sheet, the surface temperature of the slab roll is 5-12 ° C, (6) longitudinal stretching, before the longitudinal stretching, the slab is pre-pretreated After preheating, the hot roll enters the longitudinal stretching machine for 3-6 longitudinal stretching, stretches it into a thin sheet, (7) stretches in the transverse direction, and the sheet is longitudinally stretched and then enters the transverse stretching machine for 3-6. The second transverse stretching, and then into the shaping zone for secondary cooling, (8) traction trimming, and then before the trimming edge, the inspection is carried out in advance, and the sheet is inspected by the inspection device or the naked eye to see if there is any flaw, if Exist, whether it can be repaired in the process of traction trimming, and then trimming, the waste generated in the trimming process is sent to the crusher for crushing, (9) winding, after the trimming is completed, the winding device is used for collecting Roll, (10) slitting, and then unwinding the finished film, and then slitting the film according to the predetermined size after the film is unwound, (11) acceptance, after slitting The film is accepted, the qualified packaging is accepted, the acceptance is unqualified, and (12) the acceptance is qualified. Product packaging, final storage.

The present invention will be further described below in conjunction with the embodiments:

Example 1

The invention discloses a BOPP pearlescent film comprising three layers of A, B and C, wherein the A and C layers are surface layers, B is a core layer, and the surface layer A is 85-90% chlorinated polyethylene and 5% polyethylene. 3% polypropylene, 1-4% antioxidant and residual pearl powder, the core layer B is 50% polypropylene, 30% pearl powder, 2-5% antistatic agent and residual antioxidant, the surface layer C is 30-56% polystyrene, 20-35% epoxy resin, 10-20% heat stabilizer, 5-15% antistatic agent, 3-5% antioxidant, 10-15% pearl film diester And the remaining slip agent, the thickness distribution of each of the layers A, B, and C: the thickness of the surface layer A is 0.7-2.4 micrometers, the thickness of the core layer B is 5-7 micrometers, and the thickness of the surface layer C is 1-3 micrometers. The oxygen agent is p-phenylenediamine, dihydroquine a porphyrin, a trioctyl ester, a tridecyl ester or a 2,6-tributyl-4-methylphenol, the antistatic agent being an anionic antistatic agent, the main component of the slip agent being an α-amylase preparation, —-glucose, sodium alkylbenzene sulfonate and gum arabic.

A method for manufacturing a BOPP pearl film comprises the following steps: (1) filtering raw materials, and filtering the raw materials for forming the surface layer A, the core layer B and the surface layer C one by one with a filter screen to drive out the filtered impurities; 2) Mixing and mixing, the raw materials used for making surface layer A, core layer B and surface layer C are respectively placed in a mixer for mixing, stirring time is 3-5 minutes, (3) secondary filtration, mixing by mixing The raw materials are filtered by a filter screen, filtered, and placed in an extruder. (4) Melt extrusion, preheating the extruder before placing the secondary filtered mixed raw materials into the extruder. When the temperature of the heating zone is 180-210 ° C, the mixed raw materials are put into the extruder, and during the melting process, the raw materials are plasticized, kneaded by the extruder, and heated by the third and fifth. The two exhaust ports of the zone suck out the moisture on the raw material, the air is discharged by a vacuum pump, the raw material is melted and then enters the filter through the metering pump, and then enters the die; (5) the cast piece, the melt is divided into three layers in the die Outflow, the die temperature is 225-260 ° C, and then cooled by cold water in the slab roll Thick sheet, the surface temperature of the casting roll is 5-12 ° C, (6) longitudinal stretching. Before the longitudinal stretching, the thick piece is preheated by the preheating roll and then enters the longitudinal stretching machine for 3-6 times. Stretching, stretching it into a sheet, (7) transverse stretching, the sheet is longitudinally stretched and then transferred into a transverse stretching machine for 3-6 times of transverse stretching, and then into the setting zone for secondary cooling, (8 ) Traction trimming, before pulling the trimming edge, conduct inspection beforehand, check the sheet with the inspection device or the naked eye to see if there is any flaw. If it exists, see if it can be repaired during the traction trimming process, then cut it. At the same time, the waste generated during the trimming process is sent to the pulverizer for pulverization, (9) winding, after the trimming is completed, the winding device is used for winding, (10) slitting, and then the film is wound up. The unwinding is carried out, and after the film is laid in the unwinding process, the slitting device is used for slitting according to the predetermined size, (11) acceptance, the film after the slitting is subjected to acceptance, the qualified packaging is accepted, and the acceptance is unqualified, ( 12) Pack the qualified products and finally store them.

Example 2

The utility model discloses a BOPP pearl film comprising three layers of A, B and C, wherein A and C layers are surface layers, B is a core layer, and the surface layer A is 87% chlorinated polyethylene, 5% polyethylene, 3 % polypropylene, 2% antioxidant and residual pearl powder, the core layer B is 50% polypropylene, 30% pearl powder, 3% antistatic agent and residual antioxidant, the surface layer C is 45% polyphenylene Ethylene, 25% epoxy resin, 13% heat stabilizer, 9% antistatic agent, 4% antioxidant, 12% pearlescent diester and residual slip agent, thickness distribution of the layers A, B and C The thickness of the surface layer A is 2 micrometers, the thickness of the core layer B is 5 micrometers, the thickness of the surface layer C is 2 micrometers, and the antioxidant is p-phenylenediamine, dihydroquinoline, trioctyl ester, tridecyl ester or 2,6 - Tert-butyl-4-methylphenol, the antistatic agent is an anionic antistatic agent, the main components of the slip agent are α-amylase preparation, β-glucose, sodium alkylbenzene sulfonate and Arabian gum.

A method for manufacturing a BOPP pearl film comprises the following steps: (1) filtering raw materials, and filtering the raw materials for forming the surface layer A, the core layer B and the surface layer C one by one with a filter screen to drive out the filtered impurities; 2) Mixing and mixing, the raw materials for forming the surface layer A, the core layer B and the surface layer C are respectively placed in a mixer for mixing and stirring, and the stirring time is 4 Minutes, (3) secondary filtration, the raw materials after the mixing of the mixture are filtered by a filter screen, filtered, and placed in an extruder; (4) melt-extruded, mixed raw materials after secondary filtration Before putting in the extruder, preheat the extruder beforehand. When the temperature of the heating zone is 200 °C, the mixed raw materials are put into the extruder. During the melting process, the raw materials are plasticized by the extruder. Mixing, and sucking the moisture on the raw material through the two exhaust ports of the third and fifth heating zones, the air is discharged by a vacuum pump, the raw material is melted, enters the filter through the metering pump, and then enters the die; (5) The cast piece, the melt flows out in three layers in the die, the temperature of the die is 240 ° C, and then cooled by the cold water in the casting roll to form a thick piece, the surface temperature of the casting roll is 8 ° C, (6) longitudinal drawing Stretching, before longitudinal stretching, the slab is preheated by a preheating roll, subjected to longitudinal stretching in a longitudinal stretching machine for 5 times, and stretched into a sheet, (7) transversely stretched, and the sheet is pulled longitudinally. After stretching, enter the transverse stretching machine for 5 times of transverse stretching, and then enter the setting area for secondary cooling, ( 8) Traction trimming, before pulling the trimming edge, carry out inspection beforehand, check the sheet with the inspection device or the naked eye to see if there is any flaw. If it exists, see if it can be repaired during the trimming and trimming process, then proceed Trimming, the waste generated during the trimming process is sent to the pulverizer for pulverization, (9) winding, after the trimming is completed, the winding device is used for winding, (10) slitting, and then the film is completed by winding. Unwinding, after the film is laid in the unwinding process, the slitting device is used for slitting according to the predetermined size. (11) Acceptance, the film after slitting is accepted, the qualified packaging is accepted, and the acceptance is unqualified, (12) ) The products that have passed the acceptance inspection are packaged and finally put into storage.

Example 3

The invention discloses a BOPP pearl film comprising three layers A, B and C, wherein the A and C layers are surface layers, B is a core layer, and the surface layer A is 85% chlorinated polyethylene, 5% polyethylene, 3 % polypropylene, 4% antioxidant and residual pearl powder, the core layer B is 50% polypropylene, 30% pearl powder, 5% antistatic agent and residual antioxidant, the surface layer C is 30% polyphenylene Ethylene, 35% epoxy resin, 20% heat stabilizer, 5% antistatic agent, 3% antioxidant, 10% pearlescent diester and residual slip agent, thickness distribution of the layers A, B and C The surface layer A has a thickness of 2.4 μm, the core layer B has a thickness of 5 μm, and the surface layer C has a thickness of 3 μm. The antioxidant is p-phenylenediamine, dihydroquinoline, trioctyl ester, tridecyl ester or 2,6 - Tert-butyl-4-methylphenol, the antistatic agent is an anionic antistatic agent, the main components of the slip agent are α-amylase preparation, β-glucose, sodium alkylbenzene sulfonate and Arabian gum.

A method for manufacturing a BOPP pearl film comprises the following steps: (1) filtering raw materials, and filtering the raw materials for forming the surface layer A, the core layer B and the surface layer C one by one with a filter screen to drive out the filtered impurities; 2) Mixing and mixing, the raw materials for making the surface layer A, the core layer B and the surface layer C are respectively placed in a mixer for mixing, stirring time is 5 minutes, (3) secondary filtration, after mixing by mixing The raw materials are filtered by a filter screen, filtered, and placed in an extruder; (4) melt-extruded, and the pre-heated extruder is preheated before the secondary filtered mixed raw materials are placed in the extruder. When the temperature of the heating zone is 180 ° C, the mixed raw materials are placed in an extruder. During the melting process, the raw materials are plasticized and kneaded under the action of the extruder, and passed through two of the third and fifth heating zones. The exhaust port sucks out the moisture on the raw material, and the air is discharged by a vacuum pump. After the raw material is melted, it enters the filter through the metering pump and then enters the die; (5) the cast piece is melted in the mold. The head is divided into three layers, the temperature of the die is 260 ° C, and then cooled by cold water in the slab roll to form a slab. The surface temperature of the slab roll is 5 ° C, (6) longitudinal stretching, longitudinal stretching Before, the slab is preheated by the preheating roller, and then enters the longitudinal stretching machine for 6 times longitudinal stretching, which is stretched into a sheet, (7) transversely stretched, and the sheet is longitudinally stretched and then introduced into the transverse stretching machine. Perform 3 horizontal stretching in the inside, then enter the setting area for secondary cooling, (8) Traction trimming, and then pull the cutting edge before conducting inspection. Check the sheet with the inspection device or the naked eye to see if it exists.瑕疵, if it exists, whether it can be repaired during the process of traction trimming, and then trimming, the waste generated during the trimming process is sent to the pulverizer for smashing, (9) winding, after the trimming is completed, the winding is completed. The device performs winding, (10) slitting, and then the unwinding film is unwound, and after the film is laid in the unwinding process, the slitting device is used for slitting according to a predetermined size, (11) acceptance, The film after slitting is accepted, the qualified package is accepted, and the acceptance is unqualified. Back, (12) the acceptance of the product packaging, final storage.

Example 4

The BOPP pearlescent film of the present embodiment comprises three layers of A, B, and C which are sequentially stacked, wherein the A and C layers are surface layers, and B is a core layer; and the surface layer A is mainly composed of 90% chlorinated by weight. Made of ethylene, 5% polyethylene, 2% polypropylene, 1% antioxidant and the balance pearl powder, the core layer B is mainly composed of 55% polypropylene, 25% pearl powder, 5% antistatic agent and balance Made of an antioxidant, the surface layer C is mainly composed of 45% polystyrene, 20% epoxy resin, 12% heat stabilizer, 6% antistatic agent, 4% antioxidant, 10% pearl film diester and Made of a slip agent.

The thickness distribution of each layer of A, B, and C: surface layer A has a thickness of 1.8 μm, core layer B has a thickness of 7 μm, surface layer C has a thickness of 1 μm, and the antioxidant is p-phenylenediamine, and the antistatic agent The agent is an anionic antistatic agent, and the main components of the slip agent are α-amylase preparation, β-glucosidase, sodium alkylbenzene sulfonate and gum arabic.

The method for producing the BOPP pearl film comprises the following steps: (1) filtering the raw materials, and filtering the raw materials for preparing the surface layer A, the core layer B and the surface layer C by using a filter screen twice to remove the filtered impurities; (2) The mixture is stirred, and the raw materials for forming the surface layer A, the core layer B and the surface layer C are respectively placed in a mixer for mixing and stirring, and the stirring time is 5 minutes. (3) Secondary filtration, the raw materials after the mixture is stirred. Filtered by secondary filtration, filtered and placed in an extruder; (4) melt-extruded, and the mixed raw materials corresponding to the surface layer A, the core layer B and the surface layer C after secondary filtration are separately extruded. Before the machine, the extruder is preheated in advance. When the temperature of the heating zone is 180 °C, the mixed raw materials are placed in the extruder. During the melting process, the raw materials are plasticized and kneaded under the action of the extruder. And the water on the raw material is sucked out through the two exhaust ports of the third and fifth heating zones, the air is discharged by a vacuum pump, the mixed raw material is melted, enters the filter through the metering pump, and then enters the die; (5) the cast piece, The melt corresponding to the surface layer A, the core layer B and the surface layer C is divided into three layers in the die. And composite forming a composite structure, the die temperature is 225 ° C, and then cooled by cold water in the casting roll to form a thick piece, the surface temperature of the casting roll is 5 ° C; (6) longitudinal stretching, before longitudinal stretching The slab is preheated by the preheating roller, and then enters the longitudinal stretching machine for 6 times longitudinal stretching to stretch it into a sheet; (7) transverse stretching, the sheet is longitudinally stretched Enter the transverse stretching machine for 3 times of horizontal stretching, then enter the setting area for secondary cooling, (8) to pull the trimming edge, and then to pull the trimming edge before performing the inspection, and use the inspection device or the naked eye to carry out the sheet. Check and see if there is any flaws. If it exists, see if it can be repaired during the process of towing and trimming. Then cut the edges, and the waste generated during the trimming process is sent to the crusher for crushing. (9) Winding, trimming After completion, the winding device is used for winding, (10) slitting, and then the wound film is unwound, and after the film is laid in the unwinding process, the slitting device is used for slitting according to a predetermined size. 11) Acceptance, acceptance and acceptance of the film after slitting, acceptance of qualified packaging, acceptance of unqualified return, (12) packaging and acceptance of qualified products, and finally into the warehouse.

Example 5

The BOPP pearlescent film of the present embodiment comprises three layers of A, B, and C which are sequentially stacked, wherein the A and C layers are surface layers, and B is a core layer; the surface layer A is mainly composed of 87% chlorinated by weight. Made of ethylene, 6% polyethylene, 2% polypropylene, 2% antioxidant and the balance pearl powder, the core layer B is mainly composed of 45% polypropylene, 30% pearl powder, 4% antistatic agent and balance. Made of an antioxidant, the surface layer C is mainly composed of 30% polystyrene, 25% epoxy resin, 15% heat stabilizer, 10% antistatic agent, 5% antioxidant, 12% pearl film diester and Made of a slip agent.

The thickness distribution of each layer of A, B, and C: surface layer A has a thickness of 2 micrometers, core layer B has a thickness of 6 micrometers, surface layer C has a thickness of 3 micrometers, and the antioxidant is dihydroquinoline, and the antistatic agent The agent is an anionic antistatic agent, and the main components of the slip agent are α-amylase preparation, β-glucosidase, sodium alkylbenzene sulfonate and gum arabic.

The method for producing the BOPP pearl film comprises the following steps: (1) filtering the raw materials, and filtering the raw materials for preparing the surface layer A, the core layer B and the surface layer C by using a filter screen twice to remove the filtered impurities; (2) The mixture is stirred, and the raw materials for forming the surface layer A, the core layer B and the surface layer C are respectively placed in a mixer for mixing and stirring, and the stirring time is 5 minutes. (3) Secondary filtration, the raw materials after the mixture is stirred. Filtered by secondary filtration, filtered and placed in an extruder; (4) melt-extruded, and the mixed raw materials corresponding to the surface layer A, the core layer B and the surface layer C after secondary filtration are separately extruded. Before the machine, preheat the extruder in advance. When the temperature of the heating zone is 200 °C, the mixed raw materials are put into the extruder. During the melting process, the raw materials are plasticized and kneaded under the action of the extruder. And the water on the raw material is sucked out through the two exhaust ports of the third and fifth heating zones, the air is discharged by a vacuum pump, the mixed raw material is melted, enters the filter through the metering pump, and then enters the die; (5) the cast piece, The melt corresponding to the surface layer A, the core layer B and the surface layer C is divided into three layers in the die. And composite forming a composite structure, the temperature of the die is 240 ° C, and then cooled by cold water in the slab roll to form a thick sheet, the surface temperature of the slab roll is 8 ° C; (6) longitudinal stretching, before longitudinal stretching The slab is preheated by the preheating roller and then enters the longitudinal stretching machine for 6 times longitudinal stretching to stretch it into a thin sheet; (7) transversely stretching, the sheet is longitudinally stretched and then enters the transverse stretching machine. Perform 3 times of horizontal stretching, then enter the setting area for secondary cooling, (8) pull the trimming edge, and then pull the trimming edge before performing the inspection. Check the sheet with the inspection device or the naked eye to see if there is any flaw. If Exist, whether it can be repaired in the process of traction trimming, and then trimming, the waste generated in the trimming process is sent to the crusher for crushing, (9) winding, after the trimming is completed, the winding device is used for collecting Roll, (10) slitting, and then unwinding the finished film, and then slitting the film according to the predetermined size after the film is unwound, (11) acceptance, after slitting The film is accepted and accepted, and the qualified packaging is accepted. The acceptance is unqualified and returned. (12) The products that have passed the acceptance are packaged and finally put into storage.

Example 6

The BOPP pearl film of the present embodiment comprises three layers of A, B, and C which are sequentially stacked, wherein the A and C layers are surface layers, and B is a core layer; and the surface layer A is mainly composed of 85% chlorinated by weight. Made of ethylene, 4% polyethylene, 3% polypropylene, 3% antioxidant and the balance pearl powder, the core layer B is mainly composed of 48% polypropylene, 35% pearl powder, 3% antistatic agent and balance. Made of an antioxidant, the surface layer C is mainly composed of 50% polystyrene, 20% epoxy resin, 10% heat stabilizer, 5% antistatic agent, 3% antioxidant, 10% pearl film diester and the balance Made of a slip agent.

The thickness distribution of each of the layers A, B, and C: the thickness of the surface layer A is 1 micrometer, the thickness of the core layer B is 5 micrometers, the thickness of the surface layer C is 2 micrometers, and the antioxidant is 2,6-tertiary butyl- 4-methylphenol, the antistatic agent is an anionic antistatic agent, and the main component of the slip agent is an α-amylase preparation.

The method for producing the BOPP pearl film comprises the following steps: (1) filtering the raw materials, and filtering the raw materials for preparing the surface layer A, the core layer B and the surface layer C by using a filter screen twice to remove the filtered impurities; (2) The mixture is stirred, and the raw materials for forming the surface layer A, the core layer B and the surface layer C are respectively placed in a mixer for mixing and stirring, and the stirring time is 5 minutes. (3) Secondary filtration, the raw materials after the mixture is stirred. Filtered by secondary filtration, filtered and placed in an extruder; (4) melt-extruded, and the mixed raw materials corresponding to the surface layer A, the core layer B and the surface layer C after secondary filtration are separately extruded. Before the machine, preheat the extruder beforehand. When the temperature of the heating zone is 210 °C, the mixed raw materials are put into the extruder. During the melting process, the raw materials are plasticized and kneaded under the action of the extruder. And the water on the raw material is sucked out through the two exhaust ports of the third and fifth heating zones, the air is discharged by a vacuum pump, the mixed raw material is melted, enters the filter through the metering pump, and then enters the die; (5) the cast piece, The melt corresponding to the surface layer A, the core layer B and the surface layer C is divided into three layers in the die. And composite forming a composite structure, the temperature of the die is 260 ° C, and then cooled by cold water in the slab roll to form a slab, the surface temperature of the slab roll is 10 ° C; (6) longitudinal stretching, before longitudinal stretching The slab is preheated by the preheating roller and then enters the longitudinal stretching machine for 6 times longitudinal stretching to stretch it into a thin sheet; (7) transversely stretching, the sheet is longitudinally stretched and then enters the transverse stretching machine. Perform 3 times of horizontal stretching, then enter the setting area for secondary cooling, (8) pull the trimming edge, and then pull the trimming edge before performing the inspection. Check the sheet with the inspection device or the naked eye to see if there is any flaw. If it exists, whether it can be repaired during the process of traction trimming, and then trimming, the waste generated during the trimming process is sent to the pulverizer for smashing, (9) winding, after the trimming is completed, the winding device is used. Winding, (10) slitting, then winding The completed film is unwound, and after the film is laid in the unwinding process, the slitting device is used for slitting according to a predetermined size, (11) acceptance, the film after slitting is accepted, the qualified package is accepted, and the acceptance is unqualified. Returned, (12) The products that have passed the acceptance inspection are packaged and finally put into storage.

Example 7

The BOPP pearlescent film of the present embodiment comprises three layers of A, B, and C which are sequentially stacked, wherein the A and C layers are surface layers, and B is a core layer; and the surface layer A is mainly composed of 90% chlorinated by weight. Made of ethylene, 5% polyethylene, 2% polypropylene, 1% antioxidant and the balance pearl powder, the core layer B is mainly composed of 52% polypropylene, 28% pearl powder, 2% antistatic agent and the balance. Made of an antioxidant, the surface layer C is mainly composed of 35% polystyrene, 30% epoxy resin, 10% heat stabilizer, 6% antistatic agent, 4% antioxidant, 11% pearl film diester and Made of a slip agent.

The thickness distribution of each of the layers A, B, and C: the thickness of the surface layer A is 0.7 micrometers, the thickness of the core layer B is 7 micrometers, the thickness of the surface layer C is 1 micrometer, and the antioxidants are p-phenylenediamine and 2,6- Tert-butyl-4-methylphenol, the antistatic agent is an anionic antistatic agent, and the main components of the slip agent are α-amylase preparation, β-glucose, sodium alkylbenzene sulfonate and gum arabic .

The method for producing the BOPP pearl film comprises the following steps: (1) filtering the raw materials, and filtering the raw materials for preparing the surface layer A, the core layer B and the surface layer C by using a filter screen twice to remove the filtered impurities; (2) The mixture is stirred, and the raw materials for forming the surface layer A, the core layer B and the surface layer C are respectively placed in a mixer for mixing and stirring, and the stirring time is 5 minutes. (3) Secondary filtration, the raw materials after the mixture is stirred. Filtered by secondary filtration, filtered and placed in an extruder; (4) melt-extruded, and the mixed raw materials corresponding to the surface layer A, the core layer B and the surface layer C after secondary filtration are separately extruded. Before the machine, the extruder is preheated in advance. When the temperature of the heating zone is 180 °C, the mixed raw materials are placed in the extruder. During the melting process, the raw materials are plasticized and kneaded under the action of the extruder. And the water on the raw material is sucked out through the two exhaust ports of the third and fifth heating zones, the air is discharged by a vacuum pump, the mixed raw material is melted, enters the filter through the metering pump, and then enters the die; (5) the cast piece, The melt corresponding to the surface layer A, the core layer B and the surface layer C is divided into three layers in the die. And composite forming a composite structure, the temperature of the die is 260 ° C, and then cooled by cold water in the slab roll to form a slab, the surface temperature of the slab roll is 5 ° C; (6) longitudinal stretching, before longitudinal stretching The slab is preheated by the preheating roller and then enters the longitudinal stretching machine for 6 times longitudinal stretching to stretch it into a thin sheet; (7) transversely stretching, the sheet is longitudinally stretched and then enters the transverse stretching machine. Perform 3 times of horizontal stretching, then enter the setting area for secondary cooling, (8) pull the trimming edge, and then pull the trimming edge before performing the inspection. Check the sheet with the inspection device or the naked eye to see if there is any flaw. If it exists, whether it can be repaired during the process of traction trimming, and then trimming, the waste generated during the trimming process is sent to the pulverizer for smashing, (9) winding, after the trimming is completed, the winding device is used. The winding is performed, (10) slitting, and then the film which has been wound up is unwound, and after the film is laid in the unwinding process, the slitting device is used according to a predetermined size. Cut, (11) acceptance, acceptance of the film after slitting, acceptance of qualified packaging, acceptance of unqualified return, (12) the acceptance of qualified products for packaging, and finally into the warehouse.

Example 8

The BOPP pearlescent film of the present embodiment comprises three layers of A, B, and C which are sequentially stacked, wherein the A and C layers are surface layers, and B is a core layer; and the surface layer A is mainly composed of 90% chlorinated by weight. Made of ethylene, 4% polyethylene, 2% polypropylene, 2% antioxidant and the balance pearl powder, the core layer B is mainly composed of 50% polypropylene, 32% pearl powder, 4% antistatic agent and balance Made of an antioxidant, the surface layer C is mainly composed of 32% polystyrene, 35% epoxy resin, 11% heat stabilizer, 5% antistatic agent, 3% antioxidant, 10% pearl film diester and Made of a slip agent.

The thickness distribution of each layer of A, B, and C: surface layer A has a thickness of 2.4 micrometers, core layer B has a thickness of 5 micrometers, surface layer C has a thickness of 2 micrometers, and the antioxidant is triterpene ester, and the antistatic agent It is an anionic antistatic agent, and the main components of the slip agent are an α-amylase preparation and gum arabic.

The method for producing the BOPP pearl film comprises the following steps: (1) filtering the raw materials, and filtering the raw materials for preparing the surface layer A, the core layer B and the surface layer C by using a filter screen twice to remove the filtered impurities; (2) The mixture is stirred, and the raw materials for forming the surface layer A, the core layer B and the surface layer C are respectively placed in a mixer for mixing and stirring, and the stirring time is 5 minutes. (3) Secondary filtration, the raw materials after the mixture is stirred. Filtered by secondary filtration, filtered and placed in an extruder; (4) melt-extruded, and the mixed raw materials corresponding to the surface layer A, the core layer B and the surface layer C after secondary filtration are separately extruded. Before the machine, the extruder is preheated in advance. When the temperature of the heating zone is 180 °C, the mixed raw materials are placed in the extruder. During the melting process, the raw materials are plasticized and kneaded under the action of the extruder. And the water on the raw material is sucked out through the two exhaust ports of the third and fifth heating zones, the air is discharged by a vacuum pump, the mixed raw material is melted, enters the filter through the metering pump, and then enters the die; (5) the cast piece, The melt corresponding to the surface layer A, the core layer B and the surface layer C is divided into three layers in the die. And composite forming a composite structure, the temperature of the die is 260 ° C, and then cooled by cold water in the slab roll to form a slab, the surface temperature of the slab roll is 5 ° C; (6) longitudinal stretching, before longitudinal stretching The slab is preheated by the preheating roller and then enters the longitudinal stretching machine for 6 times longitudinal stretching to stretch it into a thin sheet; (7) transversely stretching, the sheet is longitudinally stretched and then enters the transverse stretching machine. Perform 3 times of horizontal stretching, then enter the setting area for secondary cooling, (8) pull the trimming edge, and then pull the trimming edge before performing the inspection. Check the sheet with the inspection device or the naked eye to see if there is any flaw. If it exists, whether it can be repaired during the process of traction trimming, and then trimming, the waste generated during the trimming process is sent to the pulverizer for smashing, (9) winding, after the trimming is completed, the winding device is used. The winding is carried out, (10) slitting, and then the film which has been wound up is unwound, and after the film is laid in the unwinding process, the slitting device is used for slitting according to a predetermined size, (11) acceptance, halving After the cut film is accepted, the qualified packaging is accepted, and the acceptance is not Grid return, (12) the acceptance of the product packaging, final storage.

Although the present invention has been illustrated and described with respect to the specific embodiments thereof, it should be understood that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced, without departing from the spirit and scope of the present invention. All such alternatives and modifications are intended to be included within the scope of the present invention.

Industrial applicability

The BOPP pearlescent film of the invention has the advantages of simple structure, convenient operation, low manufacturing cost, low defect rate generated in the manufacturing process, beautiful appearance and good performance.

Claims (16)

A BOPP pearl film comprising three layers A, B and C, wherein the A and C layers are surface layers, and B is a core layer, wherein the surface layer A is 85-90% chlorinated polyethylene, 5% polyethylene 3% polypropylene, 1-4% antioxidant and residual pearl powder, the core layer B is 50% polypropylene, 30% pearl powder, 2-5% antistatic agent and residual antioxidant, the surface layer C is 30-56% polystyrene, 20-35% epoxy resin, 10-20% heat stabilizer, 5-15% antistatic agent, 3-5% antioxidant, 10-15% pearl film diester And the remaining slip agent. The BOPP pearl film according to claim 1, wherein the thickness distribution of each of the layers A, B, and C is: the surface layer A has a thickness of 0.7 to 2.4 μm, and the core layer B has a thickness of 5 to 7 μm. The surface layer C has a thickness of 1-3 microns. The BOPP pearlescent film according to claim 1 or 2, wherein the surface layer A has a thickness of 2 to 2.4 μm, the core layer B has a thickness of 5 to 6 μm, and the surface layer C has a thickness of 2 to 3 μm. . The BOPP pearlescent film according to any one of claims 1 to 3, wherein the antioxidant comprises a substance selected from the group consisting of p-phenylenediamine, dihydroquinoline, trioctyl ester and tridecyl ester or 2,6- At least one of the group consisting of tributyl-4-methylphenol. The BOPP pearl film according to any one of claims 1 to 4, wherein the antistatic agent is an anionic antistatic agent. The BOPP pearl film according to any one of claims 1 to 5, wherein the main component of the slip agent comprises an α-amylase preparation, β-glucose, sodium alkylbenzenesulfonate and gum arabic. At least one of the group consisting of. A BOPP pearl film comprises three layers of A, B and C which are sequentially stacked, wherein A and C layers are surface layers, and B is a core layer; the surface layer A is mainly composed of 85-90% chlorinated by weight. Made of ethylene, 4-6% polyethylene, 2-4% polypropylene, 1-4% antioxidant and the balance pearl powder, the core layer B is mainly composed of 45-55% polypropylene, 25-35% pearlescent Made of powder, 2-5% antistatic agent and balance antioxidant, the surface layer C is mainly composed of 30-50% polystyrene, 20-35% epoxy resin, 10-20% heat stabilizer, 5- Made of 15% antistatic agent, 3-5% antioxidant, 10-15% pearlescent diester and balance slip agent. The BOPP pearl film according to claim 7, wherein the surface layer A is mainly composed of 85-90% chlorinated polyethylene, 5% polyethylene, 3% polypropylene, and 1-4% by weight. Oxygen agent and balance pearl powder. The BOPP pearl film according to claim 7 or 8, wherein the core layer B is mainly composed of 50% polypropylene, 30% pearl powder, 2-5% antistatic agent and balance resistance. Made of oxygen. The BOPP pearl film according to any one of claims 7-9, wherein the surface layer C is mainly composed of 30-40% polystyrene, 20-30% epoxy resin, 10-15% by weight. Made of % heat stabilizer, 5-10% antistatic agent, 3-5% antioxidant, 10-12% pearlescent diester and balance slip agent. The BOPP pearl film according to any one of claims 7 to 10, wherein the surface layer A is mainly composed of 85-90% chlorinated polyethylene, 5% polyethylene, 3% polypropylene, or the like. 1-4% of an antioxidant and a balance of pearl powder, the core layer B is mainly made of 50% polypropylene, 30% pearl powder, 2-5% antistatic agent and the balance antioxidant The surface layer C is mainly composed of 30-50% polystyrene, 20-35% epoxy resin, 10-20% heat stabilizer, 5-15% antistatic agent, 3-5% antioxidant, 10-15% pearl film. Made of diester and balance slip agent. A method for manufacturing a BOPP pearl film according to any one of claims 1 to 11, comprising the steps of: (1) filtering the raw materials, and the raw materials for preparing the surface layer A, the core layer B and the surface layer C are respectively filtered at least twice by a filter sieve to drive off the filtered impurities; (2) mixing and mixing, the raw materials for preparing the surface layer A, the core layer B and the surface layer C are respectively placed in a mixer for mixing and stirring, and the stirring time is 3-5 minutes; (3) secondary filtration, the raw materials after the mixing of the mixture are separately filtered by a filter sieve, and then filtered and placed in an extruder; (4) melt extrusion, before the secondary filtration of the mixed raw materials corresponding to the surface layer A, the core layer B and the surface layer C are placed in the extruder, the extruder is preheated in advance, when the temperature of the heating zone is 180 At -210 ° C, the mixed raw materials are placed in an extruder. During the melting process, the mixed raw materials are plasticized and kneaded under the action of the extruder, and two exhaust gases are passed through the third and fifth heating zones. The mouth sucks out the moisture on the raw material, and the air is discharged by a vacuum pump, and the raw material is melted and then enters the filter through the metering pump, and then enters the die; (5) Casting, the melt flows out in three layers in the die, the temperature of the die is 225-260 ° C, and then cooled by the cold water in the casting roll to form a thick piece. The surface temperature of the casting roll is 5-12. °C; (6) longitudinal stretching, before the longitudinal stretching, the thick sheet is preheated by the preheating roller, and then enters the longitudinal stretching machine for 3-6 longitudinal stretching, and is stretched into a sheet; (7) Lateral stretching, the sheet is longitudinally stretched and then placed in a transverse stretching machine for 3-6 times of transverse stretching, and then re-entered into the setting zone for secondary cooling. The manufacturing method according to claim 12, further comprising a step of pulling and trimming (8) performed after the transverse stretching: before the trimming of the trimming, the inspection is performed in advance, and the sheet is inspected by the inspection device or the naked eye. Check if there is 瑕疵, see if it can be repaired during the process of pulling and trimming, and then cut the edge, and the waste generated during the trimming process is sent to the pulverizer for pulverization. The manufacturing method according to claim 13, further comprising a winding step (9) performed after the trimming is trimmed, and the winding is performed by the winding device after the trimming is completed. The manufacturing method according to claim 14, further comprising a slitting step (10) performed after winding, unwinding the wound film, and tiling the film in the unwinding process The predetermined size is slit by means of a slitting device. A method for producing a BOPP pearl film, comprising the steps of: (1) filtering a raw material, and filtering the raw materials for forming the surface layer A, the core layer B and the surface layer C one by one with a filter screen, and filtering the raw materials. Impurity repelling; (2) Mixing and mixing, the raw materials for making the surface layer A, the core layer B and the surface layer C are respectively placed in a mixer for mixing, stirring time is 3-5 minutes, (3) secondary filtration, and the mixture is mixed. The stirred raw material is filtered by a filter screen for secondary filtration, and then placed in an extruder after being filtered; (4) melt-extruded, and the extruder is pre-prepared before the secondary filtered mixed raw material is placed in the extruder. Heat, when the temperature of the heating zone is 180-210 ° C, the mixed raw materials are placed in the extruder. During the melting process, the raw materials are plasticized and kneaded under the action of the extruder, and passed through the third and fifth. The two exhaust ports of the heating zone are sucked out by the moisture on the raw material, and the air is discharged by a vacuum pump, and the raw material is melted and then enters the filter through the metering pump, and then enters the die; (5) the cast piece, the melt is divided into three in the die. The layer flows out, the temperature of the die is 225-260 ° C, and then is cooled by cold water in the slab roll to form a slab. The surface temperature of the slab roll is 5-12 ° C, (6) longitudinal stretching, longitudinal stretching Before, the slab is preheated by the preheating roller and then enters the longitudinal stretching machine for 3-6 longitudinal stretching, which is stretched into a thin film. (7) transverse stretching, the sheet is longitudinally stretched and then enters the transverse stretching machine for 3-6 times of transverse stretching, and then enters the shaping zone for secondary cooling, (8) pulling the trimming edge, and then pulling the trimming edge Before the inspection, the inspection is carried out in advance, and the sheet is inspected by the inspection device or the naked eye to see if there is any flaw. If it exists, it can be repaired during the process of cutting and trimming, and then the trimming and the scrap generated during the trimming process are carried out. It is sent to the pulverizer for pulverization, (9) winding, after the trimming is completed, the winding device is used for winding, (10) slitting, and then the wound film is unwound, and the film is unwound during the unwinding process. After tiling, according to the predetermined size, the slitting device is used for slitting, (11) acceptance, the film after slitting is accepted, the qualified packaging is accepted, the acceptance is unqualified, and (12) the qualified product is packaged, and finally Storage.