Technique

Dan Hill Plast A/S combines thorough craftsmanship with State-of-the-Art technology, up-to-date manufacturing processes and constant development.

Rotational processes in plastic materials are the foundation of our production of large and complex work pieces, but we constantly develop new solutions and techniques taking our extensive know-how in this area as a starting point...

Design possibilities are virtually boundless, only your imagination is the limit. As a rule the work pieces are hollow, i.e. typical products are tanks, containers, cabinets, shields in specific shapes with a variety of choices concerning materials, colours and hardness.

The advantages of rotational moulding are:
Low shaping costs.
Work pieces, which are almost tension-free.
Big work pieces.
Complex geometries.
Moulded technical solutions, which are finished.
Material coloured in the mass.

The disadvantages of rotational moulding are:
Relatively high price per work piece.
Limited choice of material.

Rotational moulding (the process)

Preparation
If there are threaded inserts, labels and the like, they are inserted before filling the mould with the raw material. Afterwards the form is filled with an appropriate amount of plastic material either in powder form (e.g. PE) or liquid form (PVC-plastisol). The form is closed, and is now ready to put in the oven.

Rotational heating
In the hot-air furnace, the form rotates bi-axially, sending the raw material to every edge and corner of the mould. As the form gradually attains the melting point of the raw material the plastic particles start adhering to the internal surfaces of the mould. The process will continue to apply the coats until all of the plastic material has melted, and the plastic work piece has attained a smooth and even internal surface.
The thickness of the work piece depends on the quantity of raw material applied.

Rotational cooling
After this, the mould is transferred to a cooling zone, where the mould is cooled down while remaining in rotation in order to harden the plastic to reach the compactness/hardness necessary to handle the work piece.

Removal from the mould
When the mould has cooled down it is opened and the work piece carefully removed, and it is now ready to cool down to room temperature or prospective post processing, testing and quality control.
The total work cycle time varies considerably according to the thickness of the piece and the amount of work on each mould.

DHP is one the worlds leading rotational moulding plastic product suppliers.
With more than 50 years experience, DHP is a strategic partner for producing rotational moulding plastic solutions

dan hill plast a/s · Hornsyld Industrivej 37 · DK-8783 Hornsyld · +45 7568 7200 · dhp@dhp.dk · Sales and delivery terms

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