Winding – tensioning – or guiding – Bobbin or spool – Open-work structure
Reexamination Certificate
1999-09-27
2001-10-16
Mansen, Michael R. (Department: 3653)
Winding, tensioning, or guiding
Bobbin or spool
Open-work structure
C242S118310, C242S118320, C242S605000, C242S613500
Reexamination Certificate
active
06302343
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a textile tube made in an injection-blow molding process and/or an injection evacuation process, with at least a partial area of the wall of the textile tube comprising a wave profile with ring-shaped inward bulges and outward bulges alternately arranged side by side in the axial direction, wherein the textile tube has perforations.
Such a textile tube is known from German published patent application DE 25 06 512 A1 (U.S. Pat. No. 4,108,396; Brazilian patent 7600933) and has proven itself. Above all, it is advantageous that such a textile tube is axially highly deformable even in the cold state, so that after winding with windable textile material, for example a yarn, it can be compressed in axial direction, so as to require as little space as possible during subsequent heat treatment and/or wet processing of the textile material. It is in particular also advantageous with such heat treatment and/or wet processing that the tube casing, which is approximately wave shaped in the longitudinal direction, provides good radial resilience.
For certain applications it has been proven to be advantageous to match the axial and radial flexibility of the textile tube to the particular process steps for treating the textile material for the respective individual applications. To achieve this, it is already known to provide textile tubes with different wall thicknesses. For example for an application requiring a flexible textile tube, a thin-walled textile tube is used, while for an application requiring increased rigidity, a thicker-walled tube is used. For example, higher rigidity of the textile tube can improve its concentric-running stability on spindle-less winding devices. It is, however, unfavourable that textile tubes of increased wall thickness are also heavier, thus requiring accordingly more material during manufacture. Such textile tubes are therefore comparatively expensive. A further disadvantage consists in the interior diameter of the textile tube having to be matched as exactly as possible to the diameter of the adaptation elements of a winding device provided for the textile tube. However, maintaining a constant interior diameter is impossible without a change in tooling, when producing textile tubes of differing wall thicknesses using hollow shapes in injection-blow molding or injection evacuation processes.
SUMMARY OF THE INVENTION
It is thus an object of the present invention to provide a thin-walled textile tube of the type mentioned above, which is economical to produce and which permits gentle treatment of the textile material wound onto it, both during winding and during pressing.
With regard to a textile tube of the type mentioned in the introduction, this object is met in that the textile tube comprises several strip-shaped areas, arranged at its circumference, which strip-shaped areas extend continuously in axial direction across adjacent inward bulges and outward bulges with a rigidity that differs from the rigidity of radially adjacent areas of the textile tube, and in that the strip-shaped areas essentially follow the wave profile of the wall of the textile tube, such that the exterior shape of the casing of the textile tube is substantially or completely preserved.
Thus, the exterior shape of the textile tube, important for winding, remains substantially unchanged, but the textile tube derives a defined elasticity or rigidity from strip-shaped areas extending in the longitudinal direction along adjacent inward bulges and outward bulges. Consequently, higher precision is attained both during winding and cold pressing, leading to a more gentle treatment of the textile material and, in particular, more even transfer of the forces to which the textile material is exposed during pressing. The textile tube can have perforations at any desired locations, in particular in the area of the inward bulges or outward bulges.
A particularly advantageous embodiment of the invention provides for the strip-shaped areas to be reinforcements. This can be achieved, for example, in that the material of the strip-shaped areas is more rigid or of increased tensile strength when compared to the adjacent wall-material of the textile tube. This results in a thin-walled, but nevertheless stable and light, textile tube with good concentric-running stability. As a result, for example in the casing of spindle-less winding systems, any wobbling and/or jumping-off of the textile tube from the winding system, as well as the accompanying thread breakage, can largely be prevented. In addition, a good shape of the casing is achieved in spite of differences in wall thickness within normal limits. It must also be mentioned that textile tubes according to the invention, when compared to tubes made with an injection molding lattice construction, make possible a more even and thus more gentle support of the textile material during cold pressing and the subsequent heat treatment and/or wet processing.
It is advantageous if the strip-shaped areas are reinforcement ribs integrated in one piece with the wall of the textile tube, which ribs on the inside of the wall of the textile tube are essentially radially developed in the outward bulges, and in the area of the inward bulges are of smaller radial dimensions than in the area of the outward bulges. The reinforcement ribs increase the rigidity of the textile tube, with the high axial deformability essentially being maintained. The reinforcement ribs make it possible to provide a textile tube with good concentric-running stability and comparatively low weight.
An advantageous embodiment of the invention provides for the strip-shaped areas to be recessed in the outside wall of the textile tube, and for the material of the strip-shaped areas to be of different rigidity than the adjacent textile tube material. The dimensions of the textile tube can then be the same as those of a conventional thin-walled textile tube, so that the injection molding heads already existing for the manufacture of such textile tubes can continue to be used. Nevertheless, when compared to a known textile tube, the textile tube according to the invention, depending on the rigidity of the strip-shaped areas, may be of different axial and/or radial elasticity.
The molecular weight of the material of the strip-shaped areas can be higher than that of the adjacent textile tube material, located between adjacent strip-shaped areas. This results in a thin-walled textile tube of good concentric-running stability, which nonetheless provides good deformability in axial and radial directions.
An advantageous embodiment provides for the strip-shaped areas comprising strips to extend in the radial direction. This can be achieved, for example, in that during extrusion of the textile tube material, from the direction of the outside of the extruded material, replastifiable strips of hardened plastic are fed in. The blowing process or evacuation process then results in a textile tube with strips extending in the axial direction on the outside, pressed into the wall of the textile tube, with the outside of the textile tube, in radial direction, comprising an even and gradual shape without any protruding areas.
An advantageous embodiment provides for the strip-shaped areas to comprise a thread sheet grouped flat and wide, and optionally for the threads of the thread sheet to be interconnected by welding. The threads may be, for example, synthetic threads interconnected by ultrasound welding. In this way, the thread sheets are easier to handle during the production of the textile tubes. It is possible, for example, to feed the said thread sheets during the extrusion process to the thermoplastic textile tube material in the cold state.
The strip-shaped areas can, however, also comprise textile fabrics with metallic filament or staple fiber fractions or metallized monofilament and/or multifilament synthetic threads. Fabric can denote a woven structure, a mesh, a bonded fiber fabric and/or a braid. The strip-shaped areas can also comprise metallic co
Engel Adalbert
Engel Christoph
Engel Uta-Maria
Akin Gump Strauss Hauer & Feld L.L.P.
Engel Adalbert
Mansen Michael R.
LandOfFree
Textile tube does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Textile tube, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Textile tube will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2607349