Analysis of several common problems in the production process of plastic molds by plastic mold manufacturers
Time: October 9, 2024
Depression shrinkage, bubbles, material flower silver pattern silver wire, mucous membrane, flash edge batch, fusion marks, unmelted plastic particles, etc.
There are many common problems that plastic mold manufacturers encounter when producing injection molded products. They can be investigated one by one from several aspects such as injection molding machines, injection molds, plastic materials, and processing. A small problem in each link can cause the products produced by plastic mold processing to be unqualified. The following describes several common errors that occur during the process of processing plastic molds into finished products: Shrinkage, depression, and shrinkage in injection molded products indicate that the surface of the plastic product has become depressed due to volume shrinkage after molding and solidification. This usually occurs on the corresponding surface of the product column (BOSS column), rib position, or wall thickness position, or at the farthest distance from the gate position.
process of plastic molds by plastic mold manufacturers
The phenomenon of bubbles in plastic products produced by injection molding is the reason for the generation of these gases, which may be due to excessive temperature and degradation of the plastic under prolonged heating; It may also be caused by substances such as moisture and volatility in the raw materials. Usually, the appearance of bubbles is mainly in the thick wall of the product or at the final seam.
The injection molded parts produced by injection molding manufacturers produce silver streaks and various silver wires, all of which are generated from volatile substances ejected from the front end of the material flow. For example, the degradation of silver wire refers to the partial degradation of thermoplastic after heating, as well as the formation of small bubbles on the surface of the plastic during gas decomposition. These small bubbles are generally arranged in a “V” shape on the surface of the plastic, with the tip of the “V” facing away from the center of the sprue.
Analysis of several common problems in the production process of plastic mold manufacturers’ molds. The occurrence of mold sticking in injection molding molds for plastic mold products refers to surface damage or rib breakage of the product. In most cases, sticking molds can cause the loss or deformation of product structure, which can affect the appearance of the product or the assembly of the product. It can only be determined whether it is a serious defect based on the specific location of the adhesive mold. Customers generally do not accept products with adhesive molds, so it is necessary to improve this defect.
process of plastic molds by plastic mold manufacturers
Plastic mold manufacturers’ injection molded plastic parts have flying edges and sharp edges, which refers to the phenomenon of excess plastic appearing on the parting surface of plastic products. It often appears at the positions of moving parts such as the mold closure, ejector pin, and slider. This excess plastic affects the appearance or function of the product, and some burrs can even lead to poor assembly, affecting the product’s functionality. The type of defect needs to be determined based on product design. For products with generally high requirements, the flash should not exceed 0.05mm; For products with low requirements, the flash should not exceed 0.1mm. Acceptance criteria can be established based on the actual usage of the product.
Plastic mold manufacturers and injection molding factories may have weld marks during plastic injection molding, which refer to small lines formed when molten plastic is blocked by an object, resulting in incomplete fusion at the junction of two or more flow channels. Fine lines appear on both sides of the finished product in the same area.
Analysis of several common problems in the mold production process of plastic mold manufacturers: Welding marks not only affect the appearance quality of plastic products, but also affect the mechanical properties of plastic products such as impact strength, tensile strength, and elongation at break to varying degrees. If the weld mark is at the assembly position and affects the product function, it is a serious defect. Just the ordinary appearance is considered a minor defect.
Plastic mold manufacturers produce plastic products with unmelted plastic particles during injection molding, which refers to the appearance of granular pitting on the surface of plastic products. The presence of unmelted plastic particles on the surface of plastic products is generally caused by post-processing and is a modifiable issue. Therefore, customers cannot accept this type of defect, and injection molding factories must improve it.