The salivation method can produce polyolefin cast film, polyolefin cling film, polyamide cast film, etc. In general, cast film refers to polyolefin cast film, which can be specifically divided into cast polypropylene (CPP) film and cast polyethylene (CPE) film. CPP film has high transparency, good stiffness, low heat sealing temperature, heat resistance, moisture resistance, good barrier properties, strong print and composite adaptability, and smooth surface
It can be used for packaging food, stationery, groceries and textiles through printing and bag making, and can also be combined with other films (PP is generally used as the inner and outer layer of the composite film) for packaging various foods. Including foods, condiments, soups, etc. that require heat sterilization. Compared with P blown film, CPP film has excellent optical properties and high production efficiency. CPP film in developed countries in the world
The output of film is higher than that of PP blown film. Compared with biaxially oriented polypropylene (BOPP) film, CPP film has the advantages of simple processing equipment and low unit area cost, and it has a place in the field of high-end packaging film. www.handern.com Cast film equipment
      1. Structure and main raw materials
      In the 1980s, PP salivation films were mostly single-layer. In the 1990s, multi-layer composite extrusion gradually became the mainstream, and now it has developed in the direction of 5-layer and 7-layer co-extrusion. The multi-layer co-extruded composite film uses materials with different properties, and has the advantages and characteristics that a single-layer cast film cannot match. According to the type of use, CPP film is divided into three types: general type, metalized type and retort resistant type. Different cast films have different requirements for PP raw materials, and different resin properties have obvious differences. In general, the multi-layer composite CPP film is composed of a corona treatment layer, a support layer and a heat-sealing layer. The functions of the three layers and the requirements for raw materials are also different. www.handern.com Cast film equipment
       Corona treatment layer: In order to improve the printing performance of the CPP film, the surface of the film must be corona treated. CPP film must meet the requirements of easy corona treatment and slow decay rate. The use of corona treatment increases the surface roughness of the polymer and the surface wetting tension, but the surface wetting tension is not as large as possible, otherwise the film surface will become brittle due to excessive oxidation, resulting in a decrease in mechanical properties. The degree of depletion of surface wetting tension is directly related to the content of low-molecular substances in the resin. The more low-molecular substances, the faster the depletion of surface wetting tension. It is ideal when the content of wetting agent is (0.8～1.2)×103. The fundamental requirements for the corona layer raw materials are: not only must have a certain degree of anti-blocking, but also control the content of low-molecular substances. www.handern.com Cast film equipment
      The salivation method can produce polyolefin cast film, polyolefin cling film, polyamide cast film, etc. In general, cast film refers to polyolefin cast film, which can be specifically divided into cast polypropylene (CPP) film and cast polyethylene (CPE) film. CPP film has high transparency, good stiffness, low heat sealing temperature, heat resistance, moisture resistance, good barrier properties, strong print and composite adaptability, and smooth surface
It can be used for packaging food, stationery, groceries and textiles through printing and bag making, and can also be combined with other films (PP is generally used as the inner and outer layer of the composite film) for packaging various foods. Including foods, condiments, soups, etc. that require heat sterilization. Compared with P blown film, CPP film has excellent optical properties and high production efficiency. CPP film in developed countries in the world
The output of film is higher than that of PP blown film. Compared with biaxially oriented polypropylene (BOPP) film, CPP film has the advantages of simple processing equipment and low unit area cost, and it has a place in the field of high-end packaging film. www.handern.com Cast film equipment
      1. Structure and main raw materials
      In the 1980s, PP salivation films were mostly single-layer. In the 1990s, multi-layer composite extrusion gradually became the mainstream, and now it has developed in the direction of 5-layer and 7-layer co-extrusion. The multi-layer co-extruded composite film uses materials with different properties, and has the advantages and characteristics that a single-layer cast film cannot match. According to the type of use, CPP film is divided into three types: general type, metalized type and retort resistant type. Different cast films have different requirements for PP raw materials, and different resin properties have obvious differences. In general, the multi-layer composite CPP film is composed of a corona treatment layer, a support layer and a heat-sealing layer. The functions of the three layers and the requirements for raw materials are also different. www.handern.com Cast film equipment
       Corona treatment layer: In order to improve the printing performance of the CPP film, the surface of the film must be corona treated. CPP film must meet the requirements of easy corona treatment and slow decay rate. The use of corona treatment increases the surface roughness of the polymer and the surface wetting tension, but the surface wetting tension is not as large as possible, otherwise the film surface will become brittle due to excessive oxidation, resulting in a decrease in mechanical properties. The degree of depletion of surface wetting tension is directly related to the content of low-molecular substances in the resin. The more low-molecular substances, the faster the depletion of surface wetting tension. It is ideal when the content of wetting agent is (0.8～1.2)×103. The fundamental requirements for the corona layer raw materials are: not only must have a certain degree of anti-blocking, but also control the content of low-molecular substances. www.handern.com Cast film equipment