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Weldless Molding Technology (Technical Info)

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Weldless Molding Technology
Technology Info
Two color Molding Technology
Weldless Molding Technology
Water-based Coatings Technology
Technology Outline
The method for increasing the die temperature simultaneously and instantaneously with clamping and rapidly cooling the die after injection and pressure keeping time has been adopted. We succeeded in controlling the generation of welds. The technology has advantages that the surface gloss is improved and the paint process becomes unnecessary, etc., and is also superior in rigidity.
<Conventional>
<New Technology>
Welds become conspicuous with holes (in red circle portions).
Jetting occurs on the gate portion.

Unused Products


Additive exposure is found in resins containing glass fibers and fillers.
  • The rigidity of thin-walled parts is low.
  • Metal (Mg) is used.
  • Uneven transcription of pebbles occurs.
  • Gloss and loss of transparency on the surface occur, and paint is performed.
Welds are not conspicuous (cannot be seen).
No welds occur on plated parts and vapor deposited parts.

Used Parts


It is possible not to expose glass fibers and fillers.
  • The rigidity of thin-walled parts is high.
  • Substitution of magnesium alloy (Mg) by using additives of GF (glass filler) and CF (carbon filler).
  • Microfabrication of pebble shapes on a die can be faithfully transcribed because of better transcription of resin to the die surface.
  • Surface gloss is improved to make the paint process unnecessary as a result of no welds.
Applicable Parts
  • Transparent and Semi-Transparent Portions
    Panels of car audio equipment and navigation systems (decorative sheets)

  • Plating and Vapor Deposition Specification Parts
    Small parts such as mobile phone- and audio-related buttons.

  • Thin-Walled Parts
    Memory cards, etc.

  • High-Rigidity Required Parts
    Home electric appliances such as digital cameras and packages of personal computers and projectors, etc.

  • Paint-Less Parts
    Panels (chassises) of car audio equipment and navigation systems and frame panels of liquid crystal and plasma televisions, etc.