In the manufacturing of two-color molds, it is usually necessary to first conduct mold opening evaluation, optimize design and process parameters, so as to avoid unnecessary errors and meet the high quality requirements of mass production. Common problems in two-color mold opening include: release, crushing, glue overflow, obvious glue convergence line, etc. 1. Release
The reasons for the release of finished products in two-color mold opening are generally: 1. The temperature difference between the male and female molds is large; 2. The grip of the male mold is insufficient, and the grip of the female mold is large; 3. The adhesion of the female mold surface is large; 4. The resin opener and closeer is abnormal; 5. The opening and closing mold sequence is abnormal.
2. Crushing The reasons for the crushing of finished products in two-color mold opening are generally: 1. The pre-pressing amount of the second shot is too large; 2. The part of the mold core of the second shot is not avoided or is not avoided enough; 3. The first shot is deformed during release and is crushed by the second shot. 3. Glue overflow The reasons for glue overflow in two-color mold opening are generally: 1. Insufficient pre-pressure at the mold core pre-pressure; 2. Poor molding conditions, the finished product is not full in one shot; 3. The size of the mold core in one shot is not in place, resulting in insufficient thickness of the finished product in one shot; 4. If the second shot is PU, TPE and other soft materials, it may be due to the material temperature and mold temperature being too high. 4. Obvious glue line The reasons for obvious glue line in two-color mold opening are generally: 1. The mold is not vented or the venting is insufficient; 2. The gate position is poor; 3. Poor molding conditions, low material and mold temperature, low injection pressure and injection speed, etc.
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