Rolling is the main molding method of thermoplastics
Rolling is the main molding method of thermoplastics, which is the molten plasticized thermoplastic through two or more parallel rotation of the roller gap, so that the melt by extrusion extension and stretching, to become a certain size and meet the quality requirements Of a continuous film sheet product. It is called extrusion molding, injection molding together known as the three plastic molding methods.
The Calender machine is a method of forming a heated plasticized thermoplastic through a series of heated press rolls to continuously form a film or sheet. That is, the material is subject to the extension of the process, through the rotation of the two rollers to achieve the pressure, including the pressure, paste, pressure, glue and glue and other operations.
Rolling is widely used in the molding of rubber and thermoplastics. Rubber rolling is one of the basic processes of rubber products production, is made of film or made of rubber materials with the framework of semi-finished products process. Plastic calendering is mainly applied to thermoplastic, in which amorphous polyvinyl chloride and its copolymer up to, in addition to polyethylene, abs, polyvinyl alcohol, vinyl acetate and butadiene copolymer plastics. In recent years there are rolling polypropylene, polyethylene and other crystalline plastic, with the rolling production of plastic products accounted for about 1/5 of the total output of plastic products.
Calendering can also be used to trim the surface so that the surface of the sheet has the desired degree of smoothness (gloss), or intentionally to have a roughness or pattern on the surface.
The history of calendering should be traced back to 1830, beginning with the processing of rubber products. As early as the mid-19th century, two-roll, three-roll calendering machine has appeared, and has been clearly based on the use of different, the mechanical shear mixing as the purpose of the roller called grinding machine, the sheet, sheet molding The purpose of the roller type is called the calender. Early calendering machines were upright. With the application of new materials, the improvement of formulation technology and processing technology, the rolling machine is constantly updated, the design of a special plastic calender, and the use of a variety of new structures and new devices, so that rolling machine toward the multi-roll, high precision , High efficiency, the direction of automation.
The Calender machine is a method of forming a heated plasticized thermoplastic through a series of heated press rolls to continuously form a film or sheet. That is, the material is subject to the extension of the process, through the rotation of the two rollers to achieve the pressure, including the pressure, paste, pressure, glue and glue and other operations.
Rolling is widely used in the molding of rubber and thermoplastics. Rubber rolling is one of the basic processes of rubber products production, is made of film or made of rubber materials with the framework of semi-finished products process. Plastic calendering is mainly applied to thermoplastic, in which amorphous polyvinyl chloride and its copolymer up to, in addition to polyethylene, abs, polyvinyl alcohol, vinyl acetate and butadiene copolymer plastics. In recent years there are rolling polypropylene, polyethylene and other crystalline plastic, with the rolling production of plastic products accounted for about 1/5 of the total output of plastic products.
Calendering can also be used to trim the surface so that the surface of the sheet has the desired degree of smoothness (gloss), or intentionally to have a roughness or pattern on the surface.
The history of calendering should be traced back to 1830, beginning with the processing of rubber products. As early as the mid-19th century, two-roll, three-roll calendering machine has appeared, and has been clearly based on the use of different, the mechanical shear mixing as the purpose of the roller called grinding machine, the sheet, sheet molding The purpose of the roller type is called the calender. Early calendering machines were upright. With the application of new materials, the improvement of formulation technology and processing technology, the rolling machine is constantly updated, the design of a special plastic calender, and the use of a variety of new structures and new devices, so that rolling machine toward the multi-roll, high precision , High efficiency, the direction of automation.
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