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Characteristics of High-Gloss Molds
High-gloss molds control the mold temperature through a mold temperature machine, and control the timed injection of glue through hot runners, solenoid valves, and time relays, thus producing high-end products with a bright appearance, no shrinkage, and no weld marks and other defects. High-gloss molds generally have the following characteristics:
1. The molding temperature of the mold is relatively high (generally around 80~90 degrees). Maintaining pressure at a higher mold temperature is beneficial for eliminating defects such as weld marks, flow marks, and internal stress in the product. Therefore, the mold needs to be heated during operation, and to prevent heat loss, resin insulation boards are usually added to the fixed mold side.
2. The surface of the mold cavity is extremely bright (generally at mirror level 2 or higher). Products produced by high-gloss molds can be used directly for installation without any surface treatment. Therefore, the requirements for mold steel and plastic materials are very high.
3. The hot runner system has more hot nozzles (generally 6~8 nozzles, sometimes more). Each hot nozzle must have a sealing pin and an independent air passage, controlled separately through solenoid valves and time relays to achieve timed glue injection, thus controlling or even eliminating weld marks.
Requirements of High-Gloss Molds for Product Structure
High-gloss molds have very strict requirements for product structure. It is well known that the brighter the product, the more sensitive it is to light refraction effects; any slight surface defect will be quickly noticed. Therefore, how to solve the shrinkage problem is the primary issue for high-gloss products. According to statistical experience: the thickness of the rib position of general products should not exceed 0.6 times the thickness of the main glue position to avoid shrinkage, or the shrinkage is small and not easily noticed, which can be ignored. However, for high-gloss products, such requirements are far from enough; the thickness of the rib position must be reduced to not exceed 0.4 times the thickness of the main glue position, and special treatment must be done for screw column positions.High-Gloss Molds
Characteristics of High-Gloss Molds
High-gloss molds control the mold temperature through a mold temperature machine, and control the timed injection of glue through hot runners, solenoid valves, and time relays, thus producing high-end products with a bright appearance, no shrinkage, and no weld marks and other defects. High-gloss molds generally have the following characteristics:
1. The molding temperature of the mold is relatively high (generally around 80~90 degrees). Maintaining pressure at a higher mold temperature is beneficial for eliminating defects such as weld marks, flow marks, and internal stress in the product. Therefore, the mold needs to be heated during operation, and to prevent heat loss, resin insulation boards are usually added to the fixed mold side.
2. The surface of the mold cavity is extremely bright (generally at mirror level 2 or higher). Products produced by high-gloss molds can be used directly for installation without any surface treatment. Therefore, the requirements for mold steel and plastic materials are very high.
3. The hot runner system has more hot nozzles (generally 6~8 nozzles, sometimes more). Each hot nozzle must have a sealing pin and an independent air passage, controlled separately through solenoid valves and time relays to achieve timed glue injection, thus controlling or even eliminating weld marks.
Requirements of High-Gloss Molds for Product Structure
High-gloss molds have very strict requirements for product structure. It is well known that the brighter the product, the more sensitive it is to light refraction effects; any slight surface defect will be quickly noticed. Therefore, how to solve the shrinkage problem is the primary issue for high-gloss products. According to statistical experience: the thickness of the rib position of general products should not exceed 0.6 times the thickness of the main glue position to avoid shrinkage, or the shrinkage is small and not easily noticed, which can be ignored. However, for high-gloss products, such requirements are far from enough; the thickness of the rib position must be reduced to not exceed 0.4 times the thickness of the main glue position, and special treatment must be done for screw column positions.
High-Gloss Molds
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When we are processing motorcycle parts mold shells, we often encounter some problems, one of the more common ones being cracking. It is well known that the main cause of cracking is due to stress deformation, which can be mainly divided into residual stress, external stress, and stress deformation caused by the external environment. Therefore, to solve the cracking problem that occurs during the processing of plastic mold shells, we must start by addressing the stress.
High-gloss molds have very strict requirements for product structure. It is well known that the shinier the product, the more sensitive it is to light refraction effects. Any slight surface defect will be quickly noticed. Therefore, how to solve the shrinkage problem is the primary issue for high-gloss products. According to experience statistics, the thickness of the ribs in general products should not exceed 0.6 times the thickness of the main glue position to avoid shrinkage, or in other words, the shrinkage is small and not easily detected, which can be ignored. However, for high-gloss products, such requirements are far from sufficient. The thickness of the product ribs must be reduced to no more than 0.4 times the thickness of the main glue position, and special treatment must be applied to the screw column positions.