Abstract:
In order to produce as easily and as economically as possible a bobbin (1) for fibrous wound materials it is suggested that at least one bobbin flange (3) is a flat, annular disk and a frictional welding connection (5) is provided at at least one tube end face (7, 17) of the core tube (2) in the corner region (10) between the core tube (2) and the bobbin flange (3). The parts of the multiple-part bobbin (1) made of light metal are either turned parts or integral forge or extrusion parts (20) composed of a bobbin flange (3) and the core tube (2) which may be, if necessary, cut to the appropriate length so that no costly tool changes are required to produce special bobbin types or to modify the bobbin.
Abstract:
An integrated doubling and twisting method includes the step of arranging at least two supply bobbins coaxially above one another in a protective pot of a bobbin support. The at least two supply bobbins are connected to one another, and the bobbin support together with the at least two supply bobbins is rotated. The individual spun yarns from the bobbin supports are removed in the direction of the axis of rotation of the bobbin support. One of the individual spun yarns is removed in clockwise direction and another one of the individual yarns is removed in counterclockwise direction. This feature can also be applied to a method in which a balloon limiter is provided and the individual yarns are guided through a hollow spindle axle.
Abstract:
In order to simplify the production of a nigh-resistance bobbin body made of an aluminum alloy, the following process steps are performed: (a) extruding or flow extruding an essentially cylindrical bobbin blank; (b) cutting the bobbin blank to a length including the desired bobbin body length plus an overlength sufficient to form end flanges on the bobbin body; (c) shaping end flanges at both ends of the bobbin body from the overlength portion; hardening the bobbin body; and age-hardening (aging) the bobbin body. Various process parameters are described.