B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
18/647
B32B 5/20 (2006.01) B29C 44/34 (2006.01)
Patent
CA 1220312
13 ABSTRACT OF THE DISCLOSURE A propellant is mixed with unsaturated polyester inside a first space (A) at a first pressure, for example at the atmospheric pressure. The polyester is then sprayed on the wole or parts of an open or exposed mould which is applied in a low-pressure chamber having a powerful negative pressure of 60-95% vacuum. In order to spray a first layer, polyester having a first amount of propellant is sprayed on the mould. At the initiation the propellant causes a powerful foaming effect at which bubbles are created and/or expanded in the polyester. In order to spray a second layer, which can be applied before or after the first layer, polyester having a second amount of propellant, or is without propellant, is sprayed on the mould, which causes fewer bubbles or no bubbles at all. The resulting polyester which comprises formed and expanded bubbles is bound (is allowed to take rigid shape/is polymerized) by the use of a short tack-free time in the low pressure, said short time being preferably 5-10 minutes.
462427
Robic Robic & Associes/associates
Rovac Technology Ab
LandOfFree
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