Sandwich moulded parts with a skin-core structure offer the possibility of combining two different plastics with one another and in this way to achieve technical and economic advantages.

ApplicationAdvantage
Surface (skin) made of new material,
recycled material inside
cost savings
Surface (skin) compact, inside foamed plasticLightweight construction – weight savings, avoidance of sink marks
Targeted influencing
Surface (skin) “soft” plastic, internally “hard” plastic or “hard plastic” for the surface (skin), “soft” plastics for the inside of the moulded partTargeted influencing of the mechanical, acoustic and thermal properties
Introducing a “barrier layer” inside the moulded partPrevention of the penetration of gases and radiation, e.g. UV light
Use of transparent material for the surface (skin) and coloured core materialProduction of molded parts with decorative effects

Further advantages of the A&E sandwich units:

  • Any spray sequences can be implemented, i. e. skin-core and skin-core-skin
  • Any number of spray sequences in one cycle are possible
  • The integrated shut-off nozzle function results in high process stability with wide processing windows
  • Adjusting and control elements release large flow area even with small strokes – thus low pressure losses and low melt shear
  • No additional drives required for the standard version, with integrated locking function – use of a core pull of the machine
  • Less programming effort for the machine control

The sandwich hot runner nozzles cannot only be built into intermediate plates. For special and large machines in particular, it is recommended that both injection units be firmly connected to the sandwich hot runner nozzles (“nozzle head”).
The sandwich hot runner nozzle can also be installed directly in the injection moulding tool (“hot side”).

Depending on customer requirements, A&E creates a suitable technical solution for the economical use of the sandwich / coinjection process

Flow channel cross-sections

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