• Common injection molding product defects and solutions-1 Oct 25, 2019
    Ejector marks the reason: 1. The thimble is too fast. 2. Cooling time is too long or too short. 3. The pressure holding switch position is too late. 4. The pressure is too high. 5. The pressure keeping time is too long. 6. The draft is not enough. 7. The thimble position design is unreasonable or too little. 8. The direction of demoulding is rough and the degree of polishing is not enough. Solutio...
  • The common problems in injection molding of PC injection molds
    The common problems in injection molding of PC injection molds Nov 01, 2019
    Everyone in the mold industry knows that pc injection molds will encounter some quality problems in one or the other during injection molding. Why do the same set of molds have different effects on products with different materials?  This is due to the difference in the performance of the PC injection mold and the plastic material used for the injection molding. The pc material is relatively ...
  • What is the Jetting defect on the plastic product?
    What is the Jetting defect on the plastic product? Nov 01, 2019
    What is the Jetting defect on the plastic product? It means that the melt flow through nozzle, runner gate to the cavity by fast-speed,ejected without contacting mold wall. There are a few reasons caused this problem: 1. the gate is designed not so good; 2. The section of gate and runner is too small; 3. The cold-slug well location is unreasonable; 4. The injection speed sets unreasonable; 5. The ...
  • What is Double Color Mold?
    What is Double Color Mold? Nov 08, 2019
    What is Double Color Mold? Double Injection Mold is also called Two Color Mold. That's two different materials or two color materials injected in one injection machine, injected by twice, but the product only comes out one shot from the mold. This mold technology is called double material injection, usually finished by one set mold, and it needs special two color injection molding machine to produ...
  • Common injection molding product defects and solutions-2
    Common injection molding product defects and solutions-2 Nov 08, 2019
    Air traps the reason: 1. The injection speed is too fast. 2. Back pressure is too high. 3. Insufficient gas, gas encapsulation. 4. The flow channel size is too small. 5. The melt temperature is too high and it is necessary to reduce the shear. Solution: 1. Reduce the injection speed. 2. Clean the air trap in the trapped position. 3. Reduce the clamping force. 4. Reduce the pressure of holding pres...
  • Design criteria for plastic injection mold runners
    Design criteria for plastic injection mold runners Nov 08, 2019
    Design criteria for plastic injection mold runners The runner is the first channel for plastic injection molding in the mold. Most of the plastic passes through here and then into the mold cavity and core. Therefore, the position of the runner should not affect the appearance of the product, and must meet the product assembly. When the mold uses pin-point gate, the hot runner plate should have a s...
  • What is the difference between TPU extrusion and injection molding?
    What is the difference between TPU extrusion and injection molding? Nov 20, 2019
    Extrusion, also known as extrusion molding or extrusion, is also called extrusion in rubber processing. It means that the material passes through the action between the barrel and the screw of the extruder, and is plasticized while being pushed forward by the screw. A method of processing various cross-section articles or semi-finished articles by head.   Injection molding is a method of prod...
  • Short shot Nov 20, 2019
    We are going to talk about one of the most common problem during mould trial--short shot. The factor are as below: 1. It means that the cavity is not completely filled, caused the plastic parts incomplete; 2. The mold venting is not good; 3. The section of gate and runner is too small and long, The melt pressure loses too much during the flow; 4. The thin wall is not thick enough; 5. There is no c...
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A total of 24 pages

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