Formula and production process of CPP (Chlorinated Polypropylene) film

Abstract

The invention provides a formula and a production process of a CPP (Chlorinated Polypropylene) film, and relates to the technical field of CPP film production. Comprising the following steps: mixing the following raw materials according to the following proportion: high-performance polypropylene resin accounting for 70-90% of the total amount; the environment-friendly nucleating agent accounts for 0.1%-1% of the total amount; an antistatic agent accounting for 0.1%-0.5% of the total amount; a lubricant accounting for 0.1%-0.5% of the total amount; an antioxidant accounting for 0.01%-0.1% of the total amount; by using the high-performance polypropylene resin and optimizing the formula, the tensile strength and the elongation at break of the film are remarkably improved, so that the film is more durable, the nucleating agent and the antistatic agent are environmentally friendly, the use of chemical substances harmful to the environment in the production process is reduced, and the production cost is reduced by optimizing the production process. The efficient extrusion technology and the intelligent winding system are used, energy consumption is reduced, emission of waste gas and waste water is reduced through the continuous heat treatment equipment and the intelligent control system, and environmental pollution is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of CPP film production, in particular to a formula of a CPP film and a production process thereof. Background Art

[0002] Polypropylene cast film (CPP) is a non-stretched, non-directional flat extruded film produced by melt casting and quenching. Compared with blown film, it is characterized by fast production speed, high output, good film transparency, glossiness, thickness uniformity, and excellent balance of various properties. At the same time, because it is a flat extruded film, subsequent printing and lamination processes are extremely convenient, so it is widely used in the packaging of textiles, flowers, food, and daily necessities.

[0003] There are two ways to produce CPP: single-layer cast film and multi-layer co-extrusion cast film. Single-layer film mainly requires the material to have good low-temperature heat sealing performance and flexibility. Multi-layer co-extrusion cast film can generally be divided into three layers: heat sealing layer, support layer, and corona layer. The material selection is wider than that of single-layer film. Materials that meet the requirements of each layer can be selected separately to give the film different functions and uses. Among them, the heat sealing layer group must be heat-sealed, which requires the material to have a low melting point, good hot melt, a wide heat sealing temperature, and easy sealing; the support layer supports the film and increases the stiffness of the film; the corona layer must be printed or metallized, requiring a moderate surface tension, and there should be strict restrictions on the addition of additives.

[0004] After printing and bagging, CPP can be used alone for the outer packaging of food, clothing, sanitary napkins, and flowers. In addition, due to its excellent transparency and low heat-sealing temperature, it can also be used as the base film of various composite films. It can be compounded with PET film and BOPP film to package fast food products and tea; it can be compounded with barrier resins EVOH, PA, and PVDC through adhesives to package foods containing oil or soup. Other high-temperature and medium-temperature cooking films and vacuum aluminum-plated films are also important application areas.

[0005] However, there is a problem with the raw material formula. The traditional formula may contain chemicals that are harmful to the environment and do not meet modern environmental protection requirements. The nucleation efficiency is low: the effect of the nucleating agent may not be good, resulting in low transparency and crystallinity of the film; the mechanical properties are insufficient, and the mechanical strength of the film is insufficient, and it may be easily broken or damaged during application; poor temperature resistance: the film may lose strength in a high temperature environment, affecting its use effect; poor heat sealing performance: the film may not be able to achieve effective heat sealing at a lower temperature, limiting its application in different packaging needs; unstable sealing: the instability of heat sealing performance may lead to packaging failure and affect the protection effect of the product. Therefore, technicians in this field provide a CPP film formula and a production process thereof to solve the problems raised in the above background technology. Summary of the invention

[0006] 1. Technical issues to be solved

[0007] In view of the shortcomings of existing technologies, traditional formulas may contain chemicals that are harmful to the environment and do not meet modern environmental protection requirements. Low nucleation efficiency: the effect of the nucleating agent may not be good, resulting in low transparency and crystallinity of the film. Insufficient mechanical properties: the mechanical strength of the film is insufficient and it may be easily broken or damaged during application. Poor temperature resistance: the film may lose strength in a high temperature environment, affecting its use effect. Poor heat sealing performance: the film may not be able to achieve effective heat sealing at lower temperatures, limiting its application in different packaging needs. Unstable sealing: the instability of heat sealing performance may lead to packaging failure and affect the protection effect of the product.

[0008] (II) Technical solution

[0009] To achieve the above purpose, the present invention is implemented through the following technical scheme: a formula of a CPP film and its production process, including mixing the following raw materials according to the following ratio: high-performance polypropylene resin, accounting for 70%-90% of the total amount; environmentally friendly nucleating agent, accounting for 0.1%-1% of the total amount; antistatic agent, accounting for 0.1%-0.5% of the total amount; lubricant, accounting for 0.1%-0.5% of the total amount; antioxidant, accounting for 0.01%-0.1% of the total amount; ultraviolet absorber, accounting for 0.01%-0.1% of the total amount.

[0010] Preferably, the method comprises the following preparation steps:

[0011] Raw material preparation: weigh the above raw materials accurately according to the ratio to ensure uniform mixing;

[0012] Melt extrusion: Use a twin-screw extruder to melt the mixed raw materials at a temperature of 180-220°C and an extrusion speed of 50-200rpm to ensure that the raw materials are fully melted and mixed evenly;

[0013] Tape casting: The molten raw material is cast through a tape casting machine, the casting temperature is 150-220℃, the casting speed is 10-30m / min, and the film thickness is ensured to be uniform during the casting process, with a thickness range of 100-300μm;

[0014] Heat treatment: The cast film is passed through a continuous heat treatment device at a temperature of 120-150°C for 5-10 minutes. The heat treatment process helps improve the crystallinity and physical properties of the film.

[0015] Cooling: The heat-treated film is cooled to room temperature on a cooling roller;

[0016] Winding: Use the intelligent winding system to wind the cooled film at a tension of 10-30N / m.

[0017] Preferably, the environmentally friendly nucleating agent is selected from titanate compounds, the antistatic agent is selected from polysiloxane compounds, the lubricant is selected from vegetable oil compounds, the antioxidant is selected from hindered phenol compounds, and the ultraviolet absorber is selected from benzotriazole compounds.

[0018] Preferably, one part of the moisturizing agent in group C is glycerin, and one part of the antistatic agent in group C is polyquaternium-7.

[0019] Preferably, after cooling, the film is shaped by a traction roller to ensure the flatness of the film.

[0020] Preferably, the bag winding speed matches the casting speed to ensure uniform film winding.

[0021] Preferably, it has the following properties: high strength; good flame retardancy; good UV protection; good antistatic performance; good lubrication performance; environmental protection and no pollution.

[0022] Preferably, efficient extrusion technology, advanced casting machines, continuous heat treatment equipment and intelligent winding systems are used to improve film performance, reduce costs and reduce environmental impact.

[0023] Preferably, the mixed raw materials are melt-extruded by melt extrusion equipment; the extrudate is tape-cast by a tape-casting machine; the film after tape casting is continuously heat-treated for a period of several minutes to more than ten minutes; and the heat-treated film is wound by an intelligent winding system.

[0024] Preferably, a high-efficiency twin-screw extruder and an intelligent winding system are used to improve production efficiency, while environmental pollution is reduced due to the use of environmentally friendly nucleating agents and lubricants.

[0025] Preferably, the core of this solution is to optimize the raw material ratio, and high-performance polypropylene resin is used as the base material, and its molecular weight distribution and crystallinity are carefully designed to provide excellent mechanical properties and heat sealing properties.

[0026] Preferably, the addition of antistatic agent and lubricant is the key link of this scheme. Polysiloxane antistatic agent can effectively reduce the static charge on the surface of the film and prevent static electricity accumulation, which is particularly important for electronic product packaging. Vegetable oil lubricant can reduce the friction of the film during the casting process, reduce energy consumption, and improve the smoothness of the film.

[0027] Preferably, a high-efficiency twin-screw extruder is used, which has a better mixing effect and a higher melt conveying capacity, can ensure uniform mixing of raw materials, and improve production efficiency.

[0028] Preferably, continuous heat treatment equipment is used to precisely control temperature and time to achieve the desired crystallinity and mechanical properties of the film. The intelligent winding system can automatically adjust the winding tension according to the physical properties of the film to avoid wrinkles or breaks in the film due to improper tension.

[0029] Preferably, the comprehensive performance of the film is improved by accurately mixing high-performance polypropylene resin, environmentally friendly nucleating agent, antistatic agent, lubricant, antioxidant and UV absorber, and an efficient twin-screw extruder and advanced casting machine are used to ensure uniform mixing of raw materials and consistency of film performance.

[0030] Preferably, the heat treatment and winding processes are precisely controlled through continuous heat treatment equipment and an intelligent winding system to ensure the physical and mechanical properties of the film, use environmentally friendly raw materials and optimize production processes to reduce energy consumption and environmental pollution.

[0031] Preferably, the performance of the CPP film is improved, while the production cost and environmental impact are reduced, providing a new solution for the production and application of the CPP film.

[0032] (III) Beneficial effects

[0033] The present invention provides a formula of CPP film and its production process. It has the following beneficial effects:

[0034] In the present invention, by using high-performance polypropylene resin and optimizing the formula, the tensile strength and elongation at break of the film are significantly improved, making the film more durable, and environmentally friendly nucleating agents and antistatic agents reduce the use of chemicals harmful to the environment in the production process. By optimizing the production process, using efficient extrusion technology and intelligent winding system, energy consumption is reduced, and continuous heat treatment equipment and intelligent control systems reduce the emission of waste gas and wastewater, thereby reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the preparation process of the present invention;

[0036] Figure 2 Schematic diagram of formula grouping of the present invention

[0037] Figure 3 It is a schematic diagram of parameters of melt extrusion, cast molding and winding in the present invention;

[0038] Figure 4 The schematic diagram of the formula for preparing 100 kg of CPP film according to the present invention. DETAILED DESCRIPTION

[0039] The following 1 will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1:

[0041] refer to Figure 1 .Melt extrusion process:

[0042] a. Raw material preparation:

[0043] The polypropylene resin, nucleating agent, antistatic agent, lubricant, antioxidant, ultraviolet absorber and other additives are accurately weighed according to the formula ratio.

[0044] b. Melt extrusion:

[0045] Temperature Control:

[0046] The first zone (hopper): about 180-200°C;

[0047] The second zone (compression section): about 200-230°C;

[0048] The third zone (metering section): about 210-240℃;

[0049] Pressure control: ensure that the material is fully melted, usually between 100-300bar. Extrusion speed: adjusted according to the required film thickness and output, usually between 50-200rpm.

[0050] c. Extrudate conveying:

[0051] The extruder is conveyed to the tape casting machine through the outlet.

[0052] 2. Tape casting process:

[0053] a. Extrudate preheating:

[0054] Preheat the extrudate at the inlet of the casting machine, usually at a temperature of 150-200Gb. Casting:

[0055] Casting speed: Adjust according to the film thickness requirements, usually 5-50m / min. Casting temperature: The temperature of each zone is usually 150-220℃

[0056] Tension control: Maintain uniform tension, usually between 0.5-2N / m.

[0057] c. Cooling and shaping:

[0058] The cast film is cooled on a cooling roller, and the temperature is usually 20-40G. After cooling, the film is shaped by a traction roller to ensure the flatness of the film.

[0059] 3. Heat treatment process: a. Heat treatment:

[0060] The cooled film is sent to a heat treatment device such as infrared heating or steam heating

[0061] Heat treatment temperature: usually between 100-150:.

[0062] Heat treatment time: usually several minutes to

[0063] Ten minutes.

[0064] 4. Rolling process:

[0065] a. Rolling:

[0066] The heat-treated film is fed into the winder.

[0067] Winding tension: Adjust according to the thickness of the film and the mechanical properties, usually between 10-30

[0068] N / m.

[0069] Winding speed: Match with casting speed to ensure uniform film winding.

[0070] b. Packaging:

[0071] Use environmentally friendly packaging materials to package the rolled film.

[0072] Figure 1-3 As shown, the embodiment of the present invention provides a formula of CPP film and its production process, and this embodiment aims to provide specific implementation details of the production method of cast film (CPP). The parameters and steps provided in the following embodiments are only examples, and may need to be adjusted according to specific circumstances in actual production.

[0073] Raw material ratio:

[0074] High performance polypropylene resin: 85 parts;

[0075] Environmentally friendly nucleating agent (titanate): 0.6 parts;

[0076] Antistatic agent (polysiloxane): 0.3 parts;

[0077] Lubricant (vegetable oil): 0.4 parts;

[0078] Antioxidant (hindered phenol, BHT): 0.07 parts;

[0079] UV absorber (benzotriazole): 0.07 parts;

[0080] Masterbatch (adjust as needed): 3 parts.

[0081] Production steps:

[0082] Raw material preparation: Accurately weigh the above raw materials according to the ratio to ensure uniform mixing.

[0083] Melt extrusion: Use a twin-screw extruder to melt the mixed raw materials at a temperature of 180-220°C and an extrusion speed of 50-200rpm to ensure that the raw materials are fully melted and mixed evenly.

[0084] Tape casting: The molten raw material is cast through a tape casting machine, the casting temperature is 150-220℃, the casting speed is 10-30m / min, and the film thickness is ensured to be uniform during the casting process, with a thickness range of 100-300μm.

[0085] Heat treatment: The cast film is passed through a continuous heat treatment device at a temperature of 120-150°C for 5-10 minutes.

[0086] The heat treatment process helps to improve the crystallinity and physical properties of the film.

[0087] Cooling: The heat-treated film is cooled to room temperature on a cooling roller.

[0088] Winding: Use the intelligent winding system to wind the cooled film at a tension of 10-30N / m.

[0089] Performance Testing:

[0090] Tensile strength: ≥30MPa;

[0091] Elongation at break: ≥300%;

[0092] Heat sealing temperature: ≥80℃;

[0093] Light transmittance: ≥90%;

[0094] UV resistance: ≥20 hours;

[0095] Antistatic performance: ≥10^5cm.

[0096] Embodiment 2:

[0097] Figure 1-3As shown, an embodiment of the present invention provides a formula of a CPP film and a production process thereof. This embodiment aims to provide specific implementation details of a production method of a cast film (CPP). The parameters and steps provided in the following embodiments are only examples and may need to be adjusted according to specific circumstances in actual production.

[0098] Raw material ratio:

[0099] High performance polypropylene resin: 85 parts;

[0100] Environmentally friendly nucleating agent (titanate): 0.6 parts;

[0101] Antistatic agent (polysiloxane): 0.3 parts;

[0102] Lubricant (vegetable oil): 0.4 parts;

[0103] Antioxidant (hindered phenol, BHT): 0.07 parts;

[0104] UV absorber (benzotriazole): 0.07 parts;

[0105] Masterbatch (adjust as needed): 3 parts.

[0106] Production steps: accurately weigh the above raw materials according to the ratio to ensure uniform mixing.

[0107] Melt extrusion: Use a twin-screw extruder to melt the mixed raw materials at a temperature of 180-220°C.

[0108] The extrusion speed is 50-200rpm to ensure that the raw materials are fully melted and mixed evenly.

[0109] Tape casting: The molten raw material is cast through a tape casting machine. The casting temperature is 150-220°C and the casting speed is 10-30m / min to ensure that the film thickness is uniform during the casting process. The thickness range is 100-300μm.

[0110] Heat treatment: The cast film is passed through a continuous heat treatment device at a temperature of 120-150°C for 5-10 minutes. The heat treatment process helps to improve the crystallinity and physical properties of the film.

[0111] Cooling: The heat-treated film is cooled to room temperature on a cooling roller.

[0112] Winding: Use the intelligent winding system to wind the cooled film at a tension of 10-30N / m.

[0113] Performance Testing:

[0114] Tensile strength: ≥30MPa;

[0115] Elongation at break: ≥300%;

[0116] Heat sealing temperature: ≥80℃;

[0117] Light transmittance: ≥90%;

[0118] UV resistance: ≥20 hours;

[0119] Antistatic performance: ≥10^5cm.

[0120] Assuming we produce 100kg of CPP film, the specific ratio calculation is as follows:

[0121] Polypropylene (PP): 100kg;

[0122] Nucleating agent: 0.5kg;

[0123] Antistatic agent: 0.2kg;

[0124] Lubricant: 0.3kg;

[0125] Antioxidant: 0.05kg;

[0126] UV absorber: 0.05kg;

[0127] Masterbatch: 1-5kg;

[0128] Plasticizer: 1-5kg.

[0129] Please note that the above ratio is an example and needs to be adjusted in actual production according to the following factors:

[0130] Film Thickness: Different film thicknesses may require different ratios of resin and additives.

[0131] Performance requirements: For example, for films that require higher strength and rigidity, it may be necessary to increase the proportion of glass fiber or other reinforcing materials.

[0132] Cost control: The cost of additives will affect the cost of the final product. Therefore, it may be necessary to optimize the ratio to reduce costs while meeting performance requirements.

[0133] Production conditions: Different production equipment may have different requirements for the solubility and mixing effect of additives.

[0134] Comparative example: In order to better demonstrate the advantages of the improved polypropylene cast film (CPP) in this embodiment compared with the prior art, the following is a comparative example comparing the differences in key performance parameters between the product in this embodiment and the products of the prior art on the market.

[0135] Prior art CPP film

[0136] Raw material ratio:

[0137] Polypropylene resin: 80-90 parts;

[0138] Nucleating agent (traditional type): 1-2 parts;

[0139] Antistatic agent: 0.1-0.3 parts;

[0140] Lubricant: 0.1-0.3 parts;

[0141] Antioxidant: 0.02-0.05 parts;

[0142] UV absorber: 0.01-0.02 parts;

[0143] Production steps:

[0144] Melt extrusion was carried out using a conventional single screw extruder.

[0145] The casting temperature is 140-180°C and the casting speed is 5-20m / min.

[0146] The heat treatment temperature is 80-100°C and the treatment time is 1-3 minutes.

[0147] The winding tension is 20-40N / m.

[0148] Performance parameters:

[0149] Tensile strength: ≤25MPa;

[0150] Elongation at break: ≤200%;

[0151] Heat sealing temperature: ≤60;

[0152] Light transmittance: ≤80%;

[0153] UV resistance: ≤10 hours;

[0154] Antistatic performance: ≤10^3cm;

[0155] The raw material ratio of the CPP film in this embodiment is:

[0156] High performance polypropylene resin: 85-90 parts;

[0157] Environmentally friendly nucleating agent (titanate): 0.1-1 parts;

[0158] Antistatic agent (polysiloxane): 0.1-0.5 parts;

[0159] Lubricant (vegetable oil): 0.1-0.5 parts;

[0160] Antioxidant (hindered phenol, BHT): 0.01-0.1 parts;

[0161] UV absorber (benzotriazole): 0.01-0.1 parts.

[0162] Production steps:

[0163] Use efficient twin-screw extruder for melt extrusion;

[0164] The casting temperature is 150-220℃, and the casting speed is 10-30m / min;

[0165] The heat treatment temperature is 100-150°C and the treatment time is 5-10 minutes;

[0166] The winding tension is 10-30N / m.

[0167] Performance parameters:

[0168] Tensile strength: ≥30MPa;

[0169] Elongation at break: ≥300%;

[0170] Heat sealing temperature: ≥80℃;

[0171] Light transmittance: ≥90%;

[0172] UV resistance: ≥20 hours;

[0173] Antistatic performance: ≥10^5cm.

[0174] Comparative analysis:

[0175] Tensile strength and elongation at break: The CPP film of this example has significant improvements in tensile strength and elongation at break, which indicates that the film of this example has higher mechanical strength and better toughness.

[0176] Heat sealing temperature: The heat sealing temperature of the film of this embodiment is higher, which means that the film can withstand higher temperatures in packaging applications, thereby improving the reliability and safety of the packaging.

[0177] Light transmittance: The film of this embodiment has higher light transmittance, which helps to maintain the appearance and freshness of the package contents.

[0178] Anti-ultraviolet performance: The film of this example has better anti-ultraviolet performance, which means that the film can more effectively protect the package contents from ultraviolet damage.

[0179] Antistatic performance: The film of this example has significantly improved antistatic performance, which is critical for applications that require prevention of static electricity accumulation.

[0180] Production efficiency and environmental impact: This embodiment adopts a high-efficiency twin-screw extruder and an intelligent winding system to improve production efficiency. At the same time, due to the use of environmentally friendly nucleating agents and lubricants, environmental pollution is reduced.

[0181] In summary, the CPP film of this embodiment is superior to the prior art products in multiple key performance parameters, providing better performance and wider application potential.

[0182] Working principle: Based on the in-depth research and innovation of the production process of polypropylene cast film (CPP), the core of this solution is to optimize the raw material ratio to solve the problems of high energy consumption, environmental pollution and material waste in the existing technology. High-performance polypropylene resin is used as the basic material, and its molecular weight distribution and crystallinity are carefully designed to provide excellent mechanical properties and heat sealing properties. The use of environmentally friendly nucleating agents, titanates, can effectively increase the crystallization rate of the film and shorten the cooling time, thereby improving production efficiency and film transparency.

[0183] Next, the addition of antistatic agents and lubricants is the key link of this solution. Polysiloxane antistatic agents can effectively reduce the static charge on the surface of the film and prevent static electricity accumulation, which is particularly important for electronic product packaging. Vegetable oil lubricants can reduce the friction of the film during the casting process, reduce energy consumption, and improve the smoothness of the film.

[0184] The addition of antioxidants, such as hindered phenol BHT, can prevent the film from degradation due to oxidation during storage and use, thus extending the service life of the film. Benzotriazole UV absorbers can absorb and disperse UV energy, reducing UV damage to the film and packaging contents.

[0185] In terms of production technology, this solution uses a high-efficiency twin-screw extruder, which has better mixing effect and higher melt conveying capacity, can ensure uniform mixing of raw materials and improve production efficiency. The advanced casting machine can accurately control the film thickness and uniformity to ensure the consistency of film performance.

[0186] During the heat treatment stage, this solution uses continuous heat treatment equipment to precisely control temperature and time to achieve the ideal crystallinity and mechanical properties of the film. The intelligent winding system can automatically adjust the winding tension according to the physical properties of the film to avoid wrinkles or breaks in the film due to improper tension.

[0187] The simulation of the entire working principle can be summarized as follows: by accurately proportioning high-performance polypropylene resin, environmentally friendly nucleating agent, antistatic agent, lubricant, antioxidant and UV absorber, the comprehensive performance of the film is improved; by using efficient twin-screw extruders and advanced cast-film machines, the uniform mixing of raw materials and the consistency of film performance are ensured; by using continuous heat treatment equipment and intelligent winding system, the heat treatment and winding processes are precisely controlled to ensure the physical and mechanical properties of the film; by using environmentally friendly raw materials and optimizing production processes, energy consumption and environmental pollution are reduced.

[0188] Through the above series of working principles, this solution successfully improves the performance of CPP film, while reducing production costs and environmental impact, providing a new solution for the production and application of CPP film.

[0189] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A formula of a CPP film, characterized in that: The method comprises mixing the following raw materials in the following proportions: high-performance polypropylene resin, accounting for 70%-90% of the total amount; environmentally friendly nucleating agent, accounting for 0.1%-1% of the total amount; antistatic agent, accounting for 0.1%-0.5% of the total amount; lubricant, accounting for 0.1%-0.5% of the total amount; antioxidant, accounting for 0.01%-0.1% of the total amount; and ultraviolet absorber, accounting for 0.01%-0.1% of the total amount.

2. The production process of a CPP film according to claim 1, characterized in that: The CPP film formulation according to claim 1 comprises the following preparation steps: Raw material preparation: weigh the above raw materials accurately according to the ratio to ensure uniform mixing; Melt extrusion: Use a twin-screw extruder to melt the mixed raw materials at a temperature of 180-220°C and an extrusion speed of 50-200rpm to ensure that the raw materials are fully melted and mixed evenly; Tape casting: The molten raw material is cast through a tape casting machine, the casting temperature is 150-220℃, the casting speed is 10-30m / min, and the film thickness is ensured to be uniform during the casting process, with a thickness range of 100-300μm; Heat treatment: The cast film is passed through a continuous heat treatment device at a temperature of 120-150°C for 5-10 minutes. The heat treatment process helps to improve the crystallinity and physical properties of the film. Cooling: The heat-treated film is cooled to room temperature on a cooling roller; Winding: Use the intelligent winding system to wind the cooled film at a tension of 10-30N / m.

3. The production process of a CPP film according to claim 2, characterized in that: The environmentally friendly nucleating agent is selected from titanate compounds, the antistatic agent is selected from polysiloxane compounds, the lubricant is selected from vegetable oil compounds, the antioxidant is selected from hindered phenol compounds, and the ultraviolet absorber is selected from benzotriazole compounds.

4. The production process of a CPP film according to claim 2, characterized in that: After cooling, the film is shaped by traction rollers to ensure the flatness of the film.

5. The production process of a CPP film according to claim 2, characterized in that: The winding speed matches the casting speed to ensure uniform film winding.

6. The production process of a CPP film according to claim 2, characterized in that: It has the following properties: high strength; Good flame retardancy; Good UV protection performance; good antistatic performance; good lubrication performance; Environmentally friendly and pollution-free.

7. The production process of a CPP film according to claim 2, characterized in that: By adopting efficient extrusion technology, advanced casting machines, continuous heat treatment equipment and intelligent winding systems, we can improve film performance, reduce costs and minimize environmental impact.

8. The production process of a CPP film according to claim 2, characterized in that: The mixed raw materials are melted and extruded through a melt extrusion device; the extrudate is tape-casted through a tape-casting machine; the film after tape-casting is continuously heat-treated for a few minutes to more than ten minutes; the film after heat treatment is wound through an intelligent winding system.

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