Cooling of plastic injection molds
Contents
1. The cooling of the plastic injection mold
2. The cooling of the plastic injection mold is usually through water cooling
When considering the injection molding process, the cooling of the plastic injection mold cannot be ignored. Obviously, if the thermal polymer is to be formed in the mold cavity, the material must be sufficiently cooled to allow it to solidify and allow the molded part to be removed from the plastic injection mold. This is essentially any cycle of the cooling part of the plastic injection mold, use cooling water to operate the plastic injection mold, and it changes with time and temperature according to the geometry of the part and the choice of thermoplastic material. The cooling of the plastic injection mold can be considered to be performed at any temperature lower than the inlet temperature of the plastic melt. Most commonly, the surface of a plastic injection mold will remain at a temperature ranging from 30 to 40 degrees Fahrenheit to 120 to 150 degrees Fahrenheit. Successful molders will strive to achieve as uniform temperature as possible on the surface of the plastic injection mold in order to develop uniform shrinkage in the plastic injection mold, thereby reducing the tendency of part warping and ensuring the performance and quality of plastic injection molds. When designing and constructing plastic injection molds, the proper layout of the cooling channels required for the two halves of the plastic injection mold must be clearly considered.
The cooling of the plastic injection mold
Remember that the performance and quality of plastic injection molds depend to a large extent on the ability to transfer heat quickly and evenly. In order to control shrinkage and warpage, it may be necessary to operate plastic injection molds at elevated temperature levels with slightly longer cycles. When the molded part has a relatively thin wall section and must be produced at a high speed, can use cooling water to operate the plastic injection mold. These are extreme; normal molding operations will fall between these limits. Obviously, the heat required to effectively melt the plastic is the same as the heat that must be removed before the part is ejected from the plastic injection mold. As the heat of the plastic increases and the temperature of the melt increases, it becomes more important that the cooling system can quickly and effectively remove more heat. The cooling of the plastic injection mold is very important for injection molders. Because lower plastic injection mold temperature can increase the rigidity and strength of parts, improve transparency, minimize shrinkage, and significantly shorten cycle time.
The cooling of the plastic injection mold is usually through water cooling
However, the number of cooling channels that can be incorporated into the mold base is limited. The location of these channels should be such that the heat transfer from the melt is as uniform as possible. In order to obtain a balanced heat transfer, it is usually necessary to provide greater cooling around the thicker parts of the molded article. Minimal warpage requires high plastic injection mold temperatures, and it also requires cooling the entire part at almost the same rate. This, in turn, requires a lower temperature around the gate of the cavity and less cooling of the part of the plastic injection mold furthest from the gate area. In order to obtain a fast cycle, it is important to use cooling water to operate the plastic injection mold, close to the gate or gate, and receive the most concentrated cooling to minimize the cooling of the parts in the plastic injection mold. The total time required. Plastic injection molds are too cold and risky, which will affect the performance and quality of plastic injection molds. There are two reasons: it may cause a short shot, and it may produce a molded part with inherent stress, which may cause stress cracking of the part in the future.
Taizhou Pubo Plastic Injection Mold Co., Ltd. has been committed to the development, research and industrial application of plastic injection molds and plastic preform products for many years. It is a top-level design expert in the domestic blow molding industry. If you want to learn more about the cooling knowledge of plastic injection molds, please continue to pay attention to the official website of Taizhou Pubo. We will update related products from time to time, and provide related product information and materials, and look forward to your visit and consultation.
Tags: The cooling of the plastic injection mold, the performance and quality of plastic injection molds, use cooling water to operate the plastic injection mold
