How to crack the problem of no spray plastic injection molding? Ideal Group said, paint-free plastic parts processing has become one of the alternatives to spray paint materials, paint-free plastic high yield, molding is easy, the parts can be 100% recycled, low VOC environmental protection, brilliant colors to meet the diversified, personalized needs of customers, the cost is lower, by the plastic products manufacturers; but paint-free materials in the process of injection molding there are also a few However, there are some technical difficulties in the process of injection molding.
1. Flow marks and fusion marks
To solve this problem, it can be realized by the rational design of the gate. The diameter of the gate should be as big as possible. If only one gate can complete the injection, try not to design into two gates, if the product needs more gates, you can consider using sequence valve (hot runner). Through the mold flow analysis software, choose the gate reasonably, so that the occurrence of flow marks and joint patterns are located at the back of the product or in places that are not easy to detect. For example, if the product has a mesh, make the joining pattern happen at the mesh. Make the joining pattern happen at the part that can be cut off, and then cut off this part after finishing injection molding.
2. Coloring effect
No spray material coloring process if not handled well, may lead to uneven coloring results. Therefore, no-spray coloring can take the following measures: 1, the use of aluminum powder; 2, a reasonable combination of pigment formulations; 3, strict control of moisture content; 4, choose a low to medium temperature of the injection temperature; 5, medium-speed segmented step control of the injection speed; 6, choose a lower injection pressure; 7, the use of higher mold temperature.
3. Pearlescent effect
To get the ideal pearlescent effect, the resin should be transparent or semi-transparent, the pigment with good transparency should be mixed with pearlescent powder as far as possible to reduce the damage to the pearlescent flake in the process, the pearlescent pigment should be fully dispersed and the pigment flake should be parallel to the surface orientation as far as possible. The reflection of spherical aluminum powder to light is more uniform and consistent, mainly occurring specular reflection, the surface has high brightness and gloss. Flake and silver dollar type aluminum powder, due to the irregular shape, the distribution of pigments in the material of different forms, light in the aluminum powder surface reflection direction is different, resulting in visual observation of light and dark differences, change the observation angle, it will produce a flicker effect.
Solve the various problems of no spray plastic, no spray plastic parts will be more applications, its environmental protection, low-cost performance more effectively help enterprises to enhance competitiveness and promote sustainable development.
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