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Flow mark causes vary for specific parts and production lines due to the variability in molds, machines, and materials. For the most part they are due to varying cooling speeds of the material as it flows through the mold. [2] The different prevention methods for varying cooling speeds are as follows:
Injection moulding (U.S. spelling: injection molding) is a manufacturing process for producing parts by injecting molten material into a mould, or mold. Injection moulding can be performed with a host of materials mainly including metals (for which the process is called die-casting ), glasses , elastomers , confections , and most commonly ...
In plastic injection, a faint mark called a witness mark (or witness line) will occur along the parting line. [1] This is unavoidable and is usually accepted despite the minor aesthetics issue. However, some part surfaces (e.g. when used for sealing [ 5 ] ) cannot tolerate witness marks, and thus either the marks must be removed post-molding or ...
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Injection molding of liquid silicone rubber (LSR) is a process to produce pliable, durable parts in high volume. Liquid silicone rubber is a high purity platinum cured silicone with low compression set, good stability and ability to resist extreme temperatures of heat and cold ideally suitable for production of parts, where high quality is ...
The moisture turns to steam when heated in the barrel of the machine, and becomes tiny gas bubbles that streak across the plastic as injection occurs. [2] This causes the silvery pattern, or streaks, to appear on the surface of the plastic. Splay can be avoided by keeping moisture out of plastics and injection molding machines.
Weld lines therefore occur during machine start-up, when equilibrium conditions have not been met. Mouldings made in this setting-up period must be rejected. There are many Computer Aided Engineering tools that are available that can predict where these areas could occur, but a skilled designer will be able to predict where such defects can be ...
Paper clip mold opened in molding machine; the nozzle is visible at right A injection molding machine with a robot. An injection molding machine (also spelled as injection moulding machine in BrE), also known as an injection press, is a machine for manufacturing plastic products by the injection molding process. It consists of two main parts ...