Picture frame with seal

S-FIT seal in Core-Back process

Coaster

Foamed S-Fit seal with turntable technology

Tool handle

Production of consumer articles through the use of a indexing plate

Rear light

Production of components for the automotive industry through the use of a rotary plate

Plate

Production of consumer articles through the use of a rotary plate

Bi-Injection

Bi-Injection is the simplest variant of two-component injection moulding from a machine and mould point of view.

Technique

Bi-Injection is the simplest variant of two-component injection moulding from a machine and mould point of view: The two colours of the same plastic material are injected into a cavity via two independent gates to meet in the cavity in a more or less defined configuration.

When the mould closes, both units start filling the cavity. The position of the border line between the colours can be defined through different worm speeds. When entering similar volume flow rates [cm³/s], it is very easy with Sumitomo (SHI) Demag machines to adjust symmetrical filling of the mould with different worm diameters.

The closed sealing slide blocks the cavity for the first component
Simultaneous injection through two gates
When pulled, the sealing slide allows the first component to combine with the second component
No accurate parting line on the finished part

Benefits

Benefits

  •  Low mould costs
  • Straightforward process engineering

Applications

Application examples

This technique is preferably used for two purposes:

  1. On the one hand, for parts intended to pass on some kind of information to the user via their two colours.
  2. On the other hand, in automotive engineering where two colours are injected, which are to be transformed into some filigree pictograms later on, and these components are then to be over-coated and the pictograms are to be laser-engraved.