mold,molding

  Injection mold  cooling water leakage is a frequent occurrence, for many reasons, mainly in the following aspects: 1. The most occurs at the joint of the mold cooling water pipe. If water leakage is found, the sealing tape should be wound around the thread of the pipe joint and then tightened. 2. Due to long-term molding conditions, the waterproof ring inside the mold will be damaged, and the O-shaped waterproof rubber ring will easily harden and crack, resulting in water leakage. Some poorly installed waterproof rings can also cause seal failure. It is generally necessary to periodically check the installation position and sealing performance of the seal. 3. The hole wall of the cooling water hole is broken. This often happens when a new mold is tried. The wall thickness of the design is sufficient, but the hole wall is broken due to machining errors or post-processing. In most cases, leaking water holes can no longer be used. 4. Inspection of the cooling water hole. It is ...

Double Injection Mold , also known as two material molding, 2 shot molding or 2K molding, is a manufacturing process used to produce complicated molded parts from two different materials.  Two kinds of plastic materials are injected on the same injection machine, and they are formed twice, but the product is only molded out at once.  This injection molding is usually completed by one mold and requires a special two-color injection molding machine. Double injection mold is becoming more and more popular in the market. This process can make the a nice appearance of the product, easy to change the color without spraying. But it needs good technical requirements, and the cost is high. The major advantages of the double injection mold are as follows: 1. Molded product has high precision and stable quality. 2. Structural strength and durability are good. 3. Small gap and good appearance. 4. It helps to reduce handling and secondary assembly.

  According to the causes of bubbles, the countermeasures are as follows: (1) When the wall thickness of the product is large, the cooling speed of its external surface is faster than that of the central plastic part. Therefore, as the cooling goes on, the resin at the central part shrinks and expands towards the surface, resulting in insufficient filling at the central part. This condition is called a vacuum bubble. Solutions mainly include: A) Determine the reasonable gate and gate size according to the wall thickness. Generally, gate height shall be 50% ~ 60% of the wall thickness of the product. B) Until the gate is sealed, a certain amount of supplementary injection material is left. C) The injection time should be slightly longer than the gate sealing time. D) Reduce the injection speed and increase the injection pressure; E) Use materials with high melt viscosity. 2) The bubbles caused by the production of volatile gases are mainly solved as follows: A) Sufficient pre-drying...