Our factory is committed to using professional and exquisite processes to produce various high - quality plastic products such as PVC, PE, PP, PLA, PS, and PC. The following is a detailed introduction to our six - step production process.
For different types of plastics, such as PVC and PE, high - quality raw material pellets are purchased from reliable suppliers. Each batch of raw materials undergoes strict quality inspection, checking indicators such as purity and particle size distribution to ensure that the raw materials meet high - standard production requirements and guarantee product quality from the source. For example, for PC raw materials, the molecular weight distribution is emphasized to ensure subsequent processing performance.
Pretreatment is carried out according to the characteristics of plastics. For highly hygroscopic PLA raw materials, sufficient drying treatment is required to remove moisture and prevent defects such as bubbles in the product due to water vaporization during processing. For plastics that need to be mixed with additives, such as PVC, which often adds plasticizers, stabilizers, etc., they are accurately proportioned and mixed in professional mixing equipment to ensure uniform dispersion of additives.
The pretreated raw materials are put into an extruder or plasticizing equipment equipped with an advanced temperature control system. Taking PP plastic as an example, in the extruder, during the rotation of the screw, through external heating and its own shearing action, the raw materials are quickly heated to the appropriate melting temperature range, gradually turning the plastic pellets into a uniform melt, preparing for subsequent molding.
Extrusion Molding: After the plastic melt is formed, the screw pushes the melt through a carefully designed and high - precision processed die at a stable rate. For example, when producing PE plastic sheets, after the melt is extruded through the die, a uniform sheet with a specific thickness and width is formed. By precisely controlling parameters such as die temperature and screw speed, the thickness accuracy of the sheet can reach ±0.01mm, meeting the strict requirements of customers for thickness accuracy. Calendering Molding (Applicable to Some Plastics): For some plastics such as PS, the plasticized melt enters the calender. The calender consists of multiple sets of rollers, and each set of rollers operates at a precisely set speed difference and pressure. Under the continuous rolling of the rollers, the plastic melt is gradually pressed into a thin and flat sheet. The surface finish of the sheet can reach a mirror effect, meeting application scenarios with extremely high requirements for appearance.
The newly formed plastic sheets have a high temperature and need to be cooled and set quickly. Through a combination of various cooling methods such as air cooling and water cooling, for example, for PVC sheets, air cooling is first used for preliminary cooling, and then water cooling is used to further cool to room temperature, ensuring rapid and uniform cooling of the sheets, stabilizing the size, and preventing deformation.
From raw materials to finished products, strict inspection is carried out throughout the process. Professional testing equipment is used to test the performance of the sheets one by one, such as thickness uniformity, tensile strength, flexural strength, transparency (for PS, PC, etc.). Only products with all indicators meeting or exceeding industry standards and customer - customized requirements will be released from the factory, ensuring that each batch of plastic products delivered to customers is of excellent quality.
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