Plastics

Process Introduction
Plastic injection molding is a manufacturing process for producing parts from both thermoplastic and thermosetting plastic materials. Material is fed into a heated barrel, mixed, and forced into a mold cavity where it cools and hardens to the configuration of the mold cavity.


Triton Capability
Triton represents a few plastic injection molders in China, from family-owned shops to ISO/TS16949-certified companies to accommodate different customer requirements. Below is our combined capacity:

  • Press Tonnage: 50 tons to 1,250 tons
  • Part weight: 1 grams to 300 grams
  • Part size: up to 1 meter or 40 inches
  • Material: PP, PC, ABS, PE, nylon, acetal, styrene, etc.
  • Surface treatment: silk-screen printing, hot-stamping, powder coating, chrome plating

Design Guidelines

  1. Use approximately uniform wall thicknesses throughout your designs.
  2. Keep walls thin - typically between 1/32" and 1/10" - to allows for proper cooling and reduces cost by minimizing use of material. Thin walls also reduce problems with material shrinkage. Although some unevenness will occur due to shrinkage, walls as thick as 1/5" can be used. Keep wall thickness at least wall length / 50. Keep 90 deg walls under 0.25" high.
  3. To strengthen parts, instead of using thicker walls, use additional structures such as ribs. Use fillets at the base of ribs. When using a rib make it about half the main wall thickness.
  4. Options for thicker area: make it hollow. But if thick area is inevitable, expect slight shrink or sink mark on the surface and slight deformation around the area.
  5. Round corners and edges wherever possible.
  6. For easy release of the part from the mold, add a slight taper or draft to the sides (typically ~ 2 deg) - especially for textured walls and walls higher than 0.25".
  7. Avoid undercuts that are impossible to remove from the mold.
  8. Flow line is inevitable although it can be relocated to some degree. Try to use lighter color materials which hide flow lines better than dark colors.
  9. Where walls meet at a 90 angle, round inside and outside to at least .05" radius - sharper outside corners can create molding problems and sharper inside corners will increase tooling cost.
  10. Keep holes at least .015" from edges.