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Category frequent questions

24 Sep

Can the rotation time of the rotomolding cycle be made more efficient?

New stabilization systems for LLDPE have been developed to accelerate the polymer densification process and allow fully cured parts to be cast using shorter heating times or lower furnace temperatures.

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24 Sep

What characteristics should molds have for rotomolding?

The molds are key pieces in the process must have the following basic requirements: The material from which they are made must have a good thermal conductivity so that the heat is transferred or removed from the plastic as quickly as possible Must have sufficient mechanical strength to remain unbalanced during the heating and cooling […]

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24 Sep

What plastic resins can be rotomolded?

Thermoplastic materials are commonly used, however, thermosetting and latex can also be used. The most common thermoplastics are: Polyethylene (HDPE-LDPE) Vinyl chloride (PVC) Polypropylene (PP) Polystyrene (PS) Acrylonitrile butadiene styrene (ABS), etc. Of the thermosetting materials, for example, RFV polyester, PU resin and polyester and epoxy resins are used.

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24 Sep

What characteristics should resins and materials that can be processed by rotomolding have?

High capacity to be ground to a fine powder, without having to resort to external cooling. Narrow particle distribution. Uniform particle size. The common mesh sizes for powders used in rotomolding range from 16 to 50, corresponding to particle sizes between 1.9 and 0.30 mm respectively. A particle size of 35 mesh powder is suitable […]

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24 Sep

What are the most important parameters that should be considered for the purchase of a rotomolding machine?

Performance in production. Heating capacity. Average time per cycle. Mold rotation speed.

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24 Sep

What are the main types of rotomolding machines?

Rock and Roll machines, turning and rocking machines are practical for the manufacture of large parts. Box-type oven machines, with this type of machines are manufactured balls, toy parts and auto parts. Shuttle machines, allow the manufacture of small and large parts. Clamshell machines. They are useful to manufacture products that need a rigorous process […]

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24 Sep

How long does the mold heating cycle involve?

The heating cycle is the longest stage in the rotomolding process. The process of heating the resin and melting the particles normally takes between 7 and 15 minutes, although cycles of up to 30 minutes are known. The duration of this stage is directly related to the desired thickness of the final piece.

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24 Sep

What are the stages in the rotomolding process and what are they?

Stage 1: Filling the mold. The required quantity of plastic material to be processed is introduced into the mold (finely ground thermoplastic powder or dispersions of thermoplastics in non-volatile solvents and some thermosetting resins) according to the weight of the final piece; it is mounted in an open and cold mold previously covered with demolding […]

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24 Sep

What is the advantage of the rotomolding process?

Possibility of producing hollow plastic articles of different sizes. No seams or joints in the final product. There are no residual efforts. The wall thickness is uniform uniform. Isotropy is guaranteed in the properties. The corners of the pieces do not become thin. Wide possibilities of product design.

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24 Sep

How does rotomolding process works?

It’s a process where a hollow mold is filled with liquid or powder resin and rotated in two directions in a hot chamber, until the resin covers the surface of the mold and is cured forming a piece.  

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