Abstract: Plasticizable material is pressure molded into articles free from flash in mold cavities of specialized molds defined by separate mold sections with removable cores. Prior to and during molding, the sections are held clamped together to fully confine the material which is pressurized by reducing the volumetric capacity of each cavity. This pressurization is maintained until the material is set or cured, and may be increased before final set to forge or densify the material further. The method employs a conventional press and two gangs of specialized two-piece, multi-cavity molds. The molds of each gang are supported in a horizontal row, with their juxtaposed flat faces and parting planes disposed vertically, for movement of each mold section flatwise endwise of the row to open and closed positions. The mold sections are clamped closed by power means which apply extraneous clamping pressure independently of the press operation.

Abstract: A pressure plate assembly for hardboard presses in which a thin metal sheet for supporting the material to be compressed into hardboard is inserted between the pressure plates. The thin metal sheet extends beyond the edges of the press plates and is bent downwardly along two opposing sides thereof to impart substantial rigidity to the overhanging portions and to provide a draining surface for the compressed material. The other two opposing edges of the metal sheet form projections having thickened reinforcement edges.

Abstract: There is disclosed a method and apparatus for molding rubber or similar products, involving the use of a press which is disclosed as being vertically arranged with hydraulic operation being provided by a hydraulic piston and cylinder apparatus which includes means for moving a series of platens upwardly to compress therebetween certain molds which are inserted therein, the platens being adapted to be suspended in open condition when the hydraulic means is appropriately actuated, there being provided at each side of the press a series of mold supports which are arranged to move as by swinging from the side of the press around into position to permit molds carried thereby to be inserted in and withdrawn from the press, the contemplation being that sequential operation of these mold supports will be effected whereby molds may be loaded with raw material while a previously loaded series of molds is in the press between the platens thereof, said last named series being withdrawn and the first series now loaded arr

Abstract: The present invention provides a device for the charging of presses, particularly multiple-opening platen hot moulding presses, having drawing members for flexible transport supports carrying material to be moulded, said transport supports being in a feed basket in front of the press, characterized in that continuously rotating drawing means are provided as drawing members for the transport supports in the press platens.