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- Publicado por: xiu umin
- Al corriente: Jul 05, 2019
- Última actualización: Jul 05, 2019
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, especially for large electrical appliances and precision plastic mould products with high surface quality requirements, shrinkage is a problem. Therefore, various technologies have been developed to reduce...MásShrinkage is the enemy of Air Cooler Mould(FURNITUREMOULD) https://www.furnituremould.com/
, especially for large electrical appliances and precision plastic mould products with high surface quality requirements, shrinkage is a problem. Therefore, various technologies have been developed to reduce shrinkage and improve product quality.
The air cooler mould parts are thicker, for example, the shrinkage formed by ribs or bulges is more severe than adjacent locations, because the thicker cooling rate region is much slower than the peripheral region. Cooling at different speeds will cause the connection to form depressions, known as shrink marks.
There may be shrinkage traces due to one or more moulding reasons, including process, parts, geometry, material selection, and air cooler mould design, etc. The choice of geometry and materials is usually decided by the raw material supplier, but not so easy to change. However, compared with the air cooler mould, it may affect the shrinkage design factors. Cooling flow path design, gate type, and gate size may have various influences. For example, a small gate tube gate is much faster than a cone. Cooling at the early stage of the gate can reduce the filling time of the cavity, thus increasing the probability of shrinkage marks. For workers, adjusting the processing conditions is a way to solve the shrinkage problem. Population pressure and time significantly affected the contraction. After filling the parts, the additional material fills the compensating shrinkage cavity of the material. The filling phase is too short, which will lead to an increase in shrinkage, and the shrinkage scar will eventually produce more or more. This method itself may not reduce the systolic marks to a satisfactory level, but workers can adjust the filling conditions to improve the systolic marks.
Another method is to modify the air cooler mould. One simple solution is to modify the conventional core hole, but this method is not expected to be applicable to all resins. In addition, the gas-assisted method is also worth a try.
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