Continuously operating double band press

A continuously operating double band press for fabrication of laminates, chipboard, fiberboard, plywood or the like;

• comprising:
• an upper and a lower endless press band each conducted over two reversing drums rotatably supported in a rigid press stand, each said press band having an inner side and an outer side;
• means to exert pressure on the inner sides of the associated press bands, said pressure exerting means comprising:
• a pressure plate fastened in the press stand and engaging the inner side of the press bands and sealed to the latter in a horizontal direction by floating seals and bounding in a vertical direction pressure chambers wherein pressure is generated by at least one fluid medium;
• heat-conducting elements arranged in the pressure chambers and each including a body within one of the pressure chambers having a surface in contact with the associated inner side of said pressure chamber such that the inner side of the press band slides along said surface;
• the improvement wherein means for heating or cooling are arranged in said body of the heat-conducting element for transferring heat directly between the body and the associated press band;
• and further comprising:
• a guide plate located in the pressure chamber spaced from the pressure plate and the press band and extending parallel to the pressure plate, said guide plate having throughholes having a larger cross-section than that of the body of the heat-conducting elements, said body of the heat-conducting elements having a circumferential edge at the side facing the pressure plate which is larger than that of the throughhole, each said body being located in one of said throughholes such that the said edge prevents it from falling through the throughhole when a pres band is replaced.

A continuously operating double band press for fabrication of laminates, chipboard, fiberboard, plywood or the like comprising:

• an upper and a lower endless press band each conducted over two reversing drums rotatably supported in a rigid press stand, each said press band having an inner side and an outer side;
• means to exert pressure on the inner sides of the associated press bands, said pressure exerting means comprising:
• a pressure plate fastened in the press stand and engaging the inner side of the press bands and sealed to the latter in a horizontal direction by floating seals and bounding in a vertical direction pressure chambers wherein pressure is generated by at least one fluid medium;
• heat-conducting elements arranged in the pressure chambers and each including a body within one of the pressure chambers having a surface in contact with the associated inner side of said press band such that the inner side of the press band slides along said surface;
• the improvement wherein means for heating or cooling are arranged in said body of the heat-conducting element for transferring heat directly between the body and the associated press band, and further wherein the surface of the body of the heat conducting element facing the inner side of the associated press band has a lattice made up of first horizontally extending flutes extending transversely of second horizontally extending flutes.

A continuously operating double band press for fabrication of laminates, chipboard, fiberboard, plywood or the like, comprising:

• an upper and a lower endless press band each conducted over two reversing drums rotatably supported in a rigid press stand, each said press band having an inner side and an outer side;
• means to exert pressure on the inner sides of the associated press bands, said pressure exerting means comprising:
• a pressure plate fastened in the press stand and engaging the inner side of the press bands and sealed to the latter in a horizontal direction by floating seals and bounding in a vertical direction pressure chambers wherein pressure is generated by at least one fluid medium;
• heat-conducting elements arranged in the pressure chambers and each including a body within one of the pressure chambers having a surface in contact with the associated inner side of said pressure chamber such that the inner side of the press band slides along said surface, the improvement wherein means for heating or cooling are arranged in said body of the heat-conducting element for transferring heat directly between the body and the associated press band, and further wherein the pressure plate is subdivided into a heating plate and a cooling plate to define a heating zone and a cooling zone, said pressure plate having a groove located in the pressure zone between the heating zone and the cooling zone, at least one heat-conducting element being arranged in said groove in contact with the press band such that stresses occurring in the press band in the transition zone are reduced.

A continuously operating double band press for fabrication of laminates, chipboard, fiberboard, plywood or the like;

• comprising:
• an upper and lower endless press band each conducted over two reversing drums rotatably supported in a rigid press stand, each said press band having an inner side and an outer side;
• means to exert pressure on the inner sides of the associated press bands, said pressure exerting means comprising:
• a pressure plate fastened in the press stand and engaging the inner side of the press bands and sealed to the latter in a horizontal direction by floating seals and bounding in a vertical direction pressure chambers wherein pressure is generated by at least one fluid medium;
• heat-conducting elements arranged in the pressure chambers and each including a body within one of the pressure chambers having a surface in contact with the associated inner side of said pressure chamber such that the inner side of the press band slides along said surface, the improvement wherein means for heating or cooling are arranged in said body of the heat-conducting element for transferring heat directly between the body and the associated press band, and further wherein the heat-conducting element is rod-shaped and comprises several side indentations to provide flexibility in its longitudinal direction.