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TECHNOLOGY  


 

Our products are exported all over the world. They are our best marketing tool, and the finest testimonial for our brand
Marcella Lorenzin, General Manager

Ever since 1973, the Simplast Group has always made use of the best technology available on the market for the rotational moulding of plastics. Over the years, this technology has evolved with experience: all our machines are the result of years of mechanical work, engineering, testing and efficiency. Dedication that has made it possible to combine the quality standards of craftsmanship with industrial flexibility and outputs.

The rotational moulding technology

is capable of producing hollow plastic parts with unique characteristics: products which are able to meet the highest standards of quality and satisfy the most demanding requirements (double layers, sandwich, varying thicknesses, complex shapes), guaranteeing unparalleled properties.

Compared to other types of moulding, the rotational process makes it possible to produce stress-free parts with no welding or joins. As no mechanical force - apart from the rotation - is applied during the melting and moulding process, the part obtained has a uniform thickness, smudge-free colouring and excellent mechanical resistance. Furthermore, parts both small and large (up to a maximum diameter of 4.5 metres) can be manufactured, with complicated contours and professional surface finishes: imitation leather, textured, mirrored, sandblasted, shot-peened, Teflon-coated and industrial gloss.

With rotomoulding you can make a part all in one go, simplifying post-moulding processes to the utmost. Moreover, the low tooling costs represent a highly affordable solution for both large and small scale production volumes.

 

ADVANTAGES

  • One-piece parts with no welding or joins
  • Stress-free parts
  • Uniform wall thickness, unlike other methods such as blow-moulding
  • No modifications required to tooling to change the wall thickness
  • Parts can have multiple layers (foam, PA, etc…)
  • Parts can be in several colours with direct transfer from the tool
  • High quality graphics can be co-moulded into parts
  • Relatively easy co-moulding of inserts inside parts
  • Holes or missing walls can be produced during the moulding process in parts which are normally complete hollow bodies, without requiring subsequent machining
  • Different types of product can be moulded at the same time on the same machine
  • Economic viability of producing parts in limited runs
  • Limited cost of tooling
  • Short tool construction times
  • Absolute competitiveness with other transformation technologies, producing between 200 and 75,000 pieces per year

PRODUCTION CYCLE

The distinguishing feature of rotational moulding lies in the movement of the mould inside a hot chamber which melts the raw material while rotating. The mould turns on a mechanical “arm” in every direction: primary (around the main axis) and secondary (variable). At the beginning of the cycle, a certain amount of raw material in powder form is introduced into the mould. As the powder melts, it becomes liquid and viscose, dropping to the bottom of the rotating mould and depositing a thin film of material onto its inside surface. When all the raw material has been deposited onto the inside surface of the mould, the heating cycle is stopped and the mould is cooled down. At this point, the material shrinks and becomes detached from the inside surface of the mould. When the mould is opened at the unloading station and the piece is removed, there is a line of flash along the parting line, but its structure is completely intact and the thickness is constant. The thickness is always proportional to the weight of the raw material introduced at the beginning of the cycle.

The moulding cycle

  

THE PROJECT PROCESS

 

 WHERE WE ARE

UNITA OPERATIVA 1:
Loc. S. Martino Nisocco, 11
12046 MONTA’ (CN) - ITALY
P.IVA 00766740047 

Tel. 0173 97.41.00
Fax 0173 97.58.41
info@simplast.com