Cutting method of rigid foam block, especially of expanded polystyrene

摘要

Several equally spaced wires begin to cut simultaneously on one straight surface (4) of a block (1) and move at the same speed along a designated curve to an opposing straight face (5). An Independent claim is also included for the process equipment used for cutting a rigid foam block, which includes a rectangular base plate having vertical corner columns, each column pair on the longer sides being connected by a variable height strut. Two spring steel bands connect each strut with the base plate edge, and a rectangular frame has electrically heated wires between the long sides, and two rolling carriages guide it along the steel bands. Adjustment of the strut height above the base plate enables each steel band to be appropriately curved. Preferred Features: A second rectangular frame with two struts parallel to the long sides are connected by electrically heated wires. The first frame can be adjusted relative to the second by swiveling control members comprising two tubes, one sliding inside the other under spring force. Each rolling carriage has two rolls running on one side of a spring steel band and a spring-loaded roller on the other side. Two additional pairs of rollers are at a right angle to the spring-loaded roller on the same side of the steel band.