Industrial chiller for temperature control of blow molding machine
The application range of chillers in industry is very wide, especially in the plastic and plastic industries, extruders, blow molding machines and other equipment are indispensable for the temperature control of the blow molding machine chiller. Let's do some temperature control of the blow molding machine. analyze:
What is a blow molding machine
Blow molding machine is a kind of equipment that makes plastic pellets into hollow containers by blow molding process. At present, the more common models include: one-time molding hollow extrusion blowing machine using PP and PE, and PET, PC or PP molding twice. The injection-stretch-blow molding machine and the newly developed multi-layer hollow extrusion blow molding and stretch blow molding. At present, most of the blow molding machines are still two-step blow molding machines, that is, plastics need to be made into preforms first, and then blown. Nowadays, environmentally friendly plastics made of PET are commonly used.
Blow molding machine production process
The thermoplastic resin is extruded or injection molded to produce a tubular plastic parison, which is placed in a split mold while it is still hot (or heated to a softened state). It expands and sticks to the inner wall of the mold, and after cooling and demoulding, it becomes a variety of hollow products.
The requirements for refrigeration in the production of the blow molding machine:
- Cooling of the preform mouth: In the preheating stage of the preform, the preform (preform) is irradiated by an infrared high temperature lamp, and the body part of the preform (preform) is heated and softened. In order to maintain the shape of the bottle mouth, the preform (preform) mouth is not required. It is heated, so it needs a certain cooling device to cool it;
- Compressed air drying: clean and dry compressed air is required for bottle blowing, and the water in the compressed air can be removed by using the chilled water provided by the industrial chiller as the cold source;
- Mold cooling: The chiller can accurately control the temperature of the mold, absorb heat in time, reduce the temperature of the mold cavity rapidly, accelerate the product setting, improve product quality, and improve production efficiency; failure to cool down in time will result in reduced product quality: not full, uneven wall thickness , The color is not bright, can not be formed and other defects.
Usually compressed air drying and mold cooling can use the same chiller as the cold source.
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