Properties of Block Foams (Slabstock)
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Low density foams that have 15-40 kg/m3 densities are produced with block foam technology. In continuous lines they can be produced as blocks with width around 2.4 meters and length of up to 30 meters. |
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Polyether polyols with TDI are the main source of base materials for the production. MDI can also be used as a substitution for TDI. |
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Continuous production lines do not use ready to use systems in production but rather blend their own systems on the pouring head. |
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It is more risky with respect to moulded foam production. As the inner core of the foam gets heated because of the reactions up to 160C degrees, it is very important to be careful during the production and shelving of the foam in order to prevent possible fire hazards. |
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Especially low density foams production needs a cooling agent like FOAM GRADE Methylene Chloride to prevent the high temperatures and scorching in the innercore of the foam. Technical methylene does the same job but does not yield the same quality material and gives worse results. PROPULSOL is a product specially designed and tailormade for this application. |
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To increase the quality and resistance of the foam, high solid content polymeric polyols are used. |
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It is also needed to use anti-flame agents to produce flame lamination type foams. (Click for flame retardants). |
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It is possible to serve a large variety of products in terms of densities, colours and physical properties. |
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Block foam production is risky in terms of production problems but the right choice of formulation, amines, tin, silicones can reduce this risk to minimum. |
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The additives for foam production are generally sold in pails or drums where as Polyol and TDI is served in tanks. TEKPOL supplies its customers in all ways including BULK. |
Click for the process for block foam production.
Click for important points for formulation.
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