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The function of the cooling water tank in plastic product manufacturing

Time：

2020-09-27

The Role of Cooling Tanks in Plastic Product Manufacturing We know that plastic extruders typically require cooling tanks to lower the temperature of products during production. So, what exactly is the function of these cooling tanks in the manufacturing process? In fact, when a plastic extruder produces plastic parts, it first heats and plastifies the raw material within the barrel. The extruder screw then subjects the material to various processing steps before it is forced through the die at the extruder’s head, where it takes its final shape. As the material exits the die under extrusion pressure, it assumes the desired product geometry. However, during this process, the shape of the extruded product can be unstable.

The function of the cooling water tank in plastic product manufacturing

We know that plastic extruders typically require a cooling tank to cool the extruded products during manufacturing. So, what role does the cooling tank play in this process? In fact, when producing plastic parts, the extruder first heats and plastifies the raw material within the barrel. The extruder screw then subjects the material to various processing steps before it is forced through the die at the extruder’s head to form the final shape. During extrusion, the material is shaped by the extrusion pressure, resulting in the desired product geometry at the die opening. However, the extruded profile can be unstable, and in some cases, the material remains in a viscous‑melt state. Therefore, after plastification, the product must be cooled to solidify and achieve its final form. To accomplish this, a cooling tank is installed on the extrusion line to lower the temperature of the extrudate. The appropriate size of the cooling tank should be determined based on the specific production requirements. If the extruded parts are particularly large, a chiller may also be needed to cool the water in the tank, ensuring effective cooling throughout the process.

A plastic sealing strip extruder is what we commonly refer to as a plastic extruder. Since many sealing strips in our daily lives are made of PVC, it is also called a plastic sealing strip extruder or an elastomer‑plastic extruder.

The applications of plastic extruders are not limited to the extrusion production of plastic sealing strips; they can also be used for extruding products such as plastic pipes and electrical wires. When manufacturing plastic products, it is essential to adjust the raw material formulation based on the desired product quality and cost.

We use a mixer to blend the raw materials according to the formulation’s ingredient ratios. Once the materials are uniformly mixed, they can be fed into a plastic pelletizing machine to produce the desired plastic pellets. A plastic pelletizing machine is a type of plastic extruder, so its production process is similar to that of a plastic strand‑extruding machine. After the pellets are produced, they are loaded into the feed hopper of the plastic extruder. From there, the pellets pass through the feeding system into the barrel, where the screw performs shearing, compression, and compounding, among other processing steps. The material is then extruded through the die of the extruder to form the sealing strip in the required shape. Following water‑cooling, the final product is complete. Since product dimensions vary, the choice of extruder model must be tailored to the specific application; selection should be based on actual operating conditions.

Hebei Shuangda Rubber & Plastics Machinery Co., Ltd. is a modern enterprise integrating 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.