PLASTIC MOULD MATERIALS

When it comes to injection mould & blow plastic mould materials nothing speeds production like Copper alloys. Mipalloy 100's thermal conductivity is almost 10 times greater than Tool Steels, so it offers faster, more uniform heat dissipation. That means more than 20% shorter cycle times. But speed of production is not the only factor. Current research at Western Michigan University shows Beryllium Copper cores exceed most production requirements. For extreme conditions such as long runs of 30% Glass-filled Nylon, Beryllium Copper lasts longer than P-20 Steel cores.

The plastics industry has proven Mipalloy 100 as a material of choice for injection moulding & blow moulding applications.

MOULD MATERIAL

THERMAL CONDUCTIVITY(Btu/Hr/Ft2/˚F)

MIPALLOY 100 (C18000)

125

0.55% BERYLLIUM COPPER

125

H-13

17

P-20

20

SS420

14

The injection moulding cycle is made up of a number of elements. They include the filling portion, the cooling portion & the mould open portion. The cooling portion is always the longest & is usually 65% of the overall cycle. Therefore the longest element in the overall cycle is where the greatest benefit can be obtained in improving the injection moulding cycle & where Beryllium Copper works best.

In addition to its superior thermal conductivity Mipalloy 100 offers the following advantages;

  • Maintains high surface finish.
  • Accepts etching & texturing.
  • Requires no additional heat treatment. Supplied in heat treated condition.
  • Can be readily machined using conventional machining practices as well as Electrical Discharge Machining (EDM).

Mipalloy manufactures & stocks Beryllium Copper in various shapes & sizes:

  • Round rod from 6mm diameter to 145mm diameter.
  • Rectangular & Square bars from 1”square upwards.
  • Large forgings weighing more than 1000 kgs single piece.

Recommended blow mould applications:

  • Blow pins : High thermal conductivity for efficient heat removal, reducing cycle time.
  • Mould Inserts : Inserts at pinch off & neck areas of Aluminium mould increasing both hardness & conductivity.
  • Complete moulds : resistant to attack in PVC applications. Mipalloy 100 alone or with hardened pinch offs for use in moulds with complex parting lines.

Recommended injection mould applications:

  • Core pins, cavity areas, sprue bushings, ejector pins & sleeves, manifold systems.

Advantages include:

  • Improved control of post mould shrinkage.
  • Better heat dissipation in areas of heavy wall sections or limited water channel access.
  • Improved dimensional stability in multi cavity tools or in large flat walled parts.
  • Excellent wear life when mated with standard tool steels.

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