Abstract: A press spar construction for a heated panel press producing chipboard panels and the like under elevated temperatures and pressures, the press spar structure having a thermal barrier arranged between each pressure plate and its supporting structure, the thermal barrier consisting of rows of insulating pressure blocks and spaced steel pressure blocks arranged between the insulating pressure blocks in the areas of maximum pressure concentration. The insulating pressure blocks are coated for imperviousness against humidity, and both types of blocks have metallic shrouds with anti-friction surface coatings. Shimming sheets are placed between the blocks and the shrouds, where necessary.

Abstract: A continuously operating panel press having a series of separately adjustable heater pads and two pairs of likewise adjustable pressure rollers with intermediate pressure pads, the pressures being adjusted for a progressively decreasing pressure pattern along the work gap, a first zone being adjusted for high pressure while successive zones exert less pressure against the press work, as it is pulled through the press by means of endless band conveyors. When excessive resistance is encountered, the highest pressure is alternatingly shifted from rollers to pads and vice versa, while the other pressures are briefly relaxed.

Abstract: A press spar construction for heated panel presses producing composite chipboard panels and the like, in which the pressure plates, in order to avoid heat distortion, are insulated from the press spars by means of pressure-resistant, water-repellant insulating blocks of high dimensional stability, which insulating blocks are encased in metallic shrouds so as to avoid friction on the insulating material.