News

Trade news

Company news

FAQ

Production Process of Transparent Sealing Strips

Time：

2020-09-12

Among the sealing strips commonly used, one type is white and transparent; this is what we refer to as PVC transparent sealing strip. The production process for PVC transparent sealing strips is similar to that of ordinary sealing strips: first, plastic granules are produced using a pelletizing machine to obtain the desired transparent pellets, which are then extruded into the required product shape. However, transparent plastic sealing strips have poor recyclability and cannot be remanufactured from recycled plastic. These strips are made primarily from resin powder, combined with auxiliary materials such as rubber oil and other raw ingredients. These raw materials…

Among the sealing strips commonly used, one type is white and transparent—this is what we refer to as PVC transparent sealing strip. The production process for PVC transparent sealing strips is similar to that of ordinary sealing strips: first, plastic granules are produced using a pelletizing machine to obtain the desired transparent pellets, which are then extruded into the required product shape. However, transparent plastic sealing strips have poor recyclability and cannot be remanufactured from recycled plastic. These strips are manufactured primarily from resin powder, combined with auxiliary materials such as rubber oil. The raw materials are mixed in a kneader; once thoroughly blended, they are fed into a pelletizing machine for granulation. Inside the extruder’s barrel, the material undergoes plasticization, compaction, degassing, and other processing steps, after which it is extruded through the die into multiple cylindrical strands. These strands are quenched in water and then cut by a pelletizer into the final product shape. When producing PVC transparent sealing strips, we start with these pellets. The extruder plastifies and processes the pellets, directly forming the desired sealing‑strip profile at the die. Following water cooling, the finished product is obtained. It is important not to mix a colored‑plastic extruder with one used for transparent sealing strips, as reprocessing colored plastic in such an extruder can lead to color contamination and other quality issues.

Transparent sealing strips are a type of plastic sealing strip; however, they cannot be manufactured using recycled plastics, which results in relatively poor recyclability. When producing PVC transparent sealing strips, the raw materials must first be processed into plastic pellets before they can be further molded into the sealing strips we need.

We mix raw materials such as resin powder, oil, and additives in a mixer. Once the mixture is uniform, it is fed into a plastic pelletizing machine to produce pellets. The plastic enters the barrel via the feeding system, where it is heated and plasticized; the screw then subjects it to shearing, compression, and intensive blending, among other processing steps. Finally, the material is extruded from the pelletizer’s barrel, forming the plastic pellets we need.

Plastic pellets are the raw material used to manufacture transparent plastic sealing strips. After the pellets are produced, they are processed by a plastic extruder and then extruded through the die to form the desired product shape. Once extruded, the products are quenched in water to cool them, resulting in the finished goods. Extruders for transparent plastic sealing strips cannot be interchanged with those used for ordinary plastics; this is due to differences in their plasticizing capacity, and because using them interchangeably can lead to color contamination and other issues that compromise product quality.

Hebei Shuangda Rubber & Plastics Machinery Co., Ltd. is a modern enterprise that integrates research and development, manufacturing, and sales of complete sets of extrusion equipment for rubber, silicone, and plastics. The company’s main products include rubber extruders, rubber hose extrusion lines, three‑layer composite sealing strip extrusion lines, silicone sealing strip production lines, plastic sealing strip production lines, plastic profile production lines, plastic pipe production lines, elastomer extruders, and other extrusion equipment, as well as production machinery for engineering seals, automotive seals, wire and cable applications, air‑conditioning hoses, braided hoses, automotive hoses, waterstop strips, and related products.