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Home Composites Technologies

 

Technologies

 Amberplastic, UAB in its production uses the following technology:

  • Manual lay-up. The first layer sprayed into the product mould is the gel coat (thickened coloured resin), which may be of any colour. The gel coat fully binds with the resin-impregnated fibrous material that is added later. The impregnated fibrous material in the mould is left to dry, being removed later. This technique is used for the manufacture of small, medium, unusual-form or one-off products.

  • Resin and glass fibre spray. The same spray gun that is used to spray the first layer (the gel coat) into the mould is used to add a layer of chopped glass filament mixed with resin, a mixture that under high pressure sticks to the mould. This technique is used in mass-production of objects of medium size and in the manufacture of large, open objects. The chief advantages of this method of manufacture are the practically unlimited size of product that can be manufactured and the great speed with which the objects are moulded.

  • Vacuum-assisted RTM. This technique is used when trying to give the product special properties (strength, lightness) by using a minimal amount of resin. During the manufacturing process the fibrous material is laid into a mould for one side of the product. Later the other side of the product mould is pressed against the first one. The two parts are hermetically sealed, air is extracted, and resin is admitted though special apertures, until all the empty spaces are filled. This production technique is well suited to the manufacture of small objects of complex shape, since it significantly reduces the number of faulty products that have not been properly impregnated.

  • Filament winding. In this process, impregnated ribbons of fibre are stretch-wound onto a rotating product mould of appropriate diameter and length. When the product solidifies, the mould inside is dismantled and removed.

Roof construction beams (a major part of roof construction) are produced by pultrusion. In this process the glass fibre strips and filaments are pulled into the resin infeed area, in which they are pressed to the required shape. Later the moulded girder is pushed through a heated pultrusion die at a steady pace, from which it emerges fully hardened and is cut to the required lengths.