Abstract: A braking device for winding cores for webs of material to be unwound with varying web tension. The device includes a pressure medium actuated cylinder piston unit controlling brake shoes which act on the winding core trunnions. The cylinder-piston unit comprises at least two longitudinally aligned pistons having their axes coincident in the operating direction and abutting on each other in their rest positions. The pressure medium is applied to the pistons individually or in tandem to produce different braking forces.

Abstract: A device for chucking tubular winding cores, and particularly cores carrying paper webs or webs of similar material, wherein chucking segments forming a cylindrical surfaces are radially positioned by means of a core trunnion having an equilateral polygonal cross section, each of the chucking segments bearing on an individual surface of the trunnion through a support member having a rounded profile and producing a line contact. The support members are carried without play or with very little play in a cage inserted coaxially to be freely rotatable between the chucking segments and the core trunnion.

Abstract: An unwinding stand for a plurality of rolls of material has an elevating mechanism for raising the individual rolls of material to the level of bearing brackets mounted on stand columns and disposed on either side of the unwinding stand. The elevating mechanism includes a guide column disposed between the stand columns and an elevating platform with dual outriggers guided on the guide column for the loading of the bearing brackets disposed on both sides of the stand with rolls of material.

Abstract: An apparatus for rotatably mounting a web on a spool including two chucks, each carried by a shaft which is rotatably mounted in a mounting frame, and each having a mandrel axially delimited by a stop flange and on which the spool is releasably clamped. Each chuck has a stripping ring disposed around the mandrel between the stop flange and a spool to be received, and configured to be axially slidable therealong, and wherein the ring comprises an axially extending collar. An actuating device is mounted on the mounting frame and is coactive with the stripping ring to effect the axial displacement thereof away from the stop flange so as to strip the spool from the mandrel.

Abstract: An apparatus for unwinding rolls of sheet material and for adhering the end of one roll to the beginning of the next at full running speed, without interruption. Means are also provided to permit operation with rolls of different widths and even with two narrow rolls alongside one another. A support which can be operatively positioned between two such narrow rolls can be moved laterally out of the way to take up an end-supporting position when a single wide roll is being unwound.

Abstract: A synchronizing system for synchronizing the speeds of two webs of goods, wherein the first web runs at a constant speed and the second web has an adjustable running speed. First pulses are generated which have a frequency dependent upon the speed of the second web and a first counter is associated with the second web and is triggered by the first pulses. The first counter is also controlled to be started and stopped by at least one pair of timing marks which are running with the second web of goods. As a result of the frequency of the first pulses and the starting and stopping of the first counter, the first counter reaches a constant count upon stopping and each time the first counter is started for the next count this constant count is reached. Second pulses having a constant frequency associated with the speed of the first web are used to trigger a second counter which is started and stopped by the first counter when the constant count is reached.

Abstract: Thermoplastic nylons are stabilized with copper compounds and synergistic halides by incorporation of from 0.1 to 10% of a concentrate of nylon, copper bromide or iodide and calcium bromide, zinc bromide or magnesium bromide. The stabilized nylons may be thermoplastically processed to give semimanufactures or films.

Abstract: Process for the continuous manufacture of polymeric starting materials for high-grade transparent thin sheeting, whereinA. .epsilon.-caprolactam is continuously agitated in a first reaction zone under polyamide-forming conditions at temperatures of from 240.degree. to 290.degree. C until at least 20% and preferably at least 35% of the .epsilon.-caprolactam has reacted,B. magnesium silicate having a particle size of less than 30 .mu.m is then added to the melt to give magnesium silicate concentrations in the reaction mixture of from 0.0005 to 0.5% and preferably from 0.001 to 0.01%, andC. the melt is then polymerized in further stages to completion until the relative viscosity is from 2.4 to 3.3 and preferably from 2.5 to 2.8.

Abstract: A film of poly(hexamethylenediamine adipate) (nylon 6,6) which contains from 0.01 to 2 per cent by weight of an ester of an aliphatic alcohol of 4 to 10 carbon atoms.