Abstract: A textile tube (1) made in an injection-blow molding process and/or an injection evacuation process has a wall (2) with a wave profile with ring-shaped surrounding inward bulges (3) and outward bulges (4) alternately arranged side by side in an axial direction. The textile tube (1) has perforations (5). In several places arranged offset in relation to each other in a circumferential direction, the textile tube (1) has several strip-shaped areas (7) of a rigidity that differs from the rigidity of radially adjacent areas of the textile tube, and the strip-shaped areas (7) substantially follow the shape of the casing of the textile tube. In the case of fastenable textile tubes, a coupling is provided with a coupling aperture enclosed by a flexible wall area (16) and a matching rigid end lip (15) with the wall section (18) adjoining the end lip (15) being of equally flexible construction.

Abstract: Tublar workpieces are formed with perforations of desired size and/or shape by repeatedly piercing selected portions of the workpieces by needles, pins or analogous piercing tools. The tools can be stationary while the workpieces roll therealong, or the workpieces can rotate while coming into repeated engagement with one or more sets of orbiting tools. The frequency and the number of penetrations of tools into selected portions of the workpieces are selected with a view to heat the tools as a result of frictional engagement with the material of the workpieces, i.e., as a result of repeated penetration into and extraction from selected portions of a rotating or rotating and rolling and/or axially moving workpiece. This enhances the making of predictable perforations in tubular workpieces, especially workpieces which consist of a synthetic thermoplastic material, such as bobbins for the storage of textile yarns.

Abstract: A bobbin for a roll of coiled filamentary textile material has a tubular body which includes circumferentially extending larger-diameter sections alternating with smaller-diameter sections. At least some of the sections are plastically and/or elastically deformable so as to allow for predictable axial shortening and/or reduction of the outer diameter of the roll. The tubular body is permeable to liquids so that a dye or the like can permeate the roll from the outside as well as from within. The sections may constitute convolutions of a helix or discrete rings, and at least the larger-diameter sections may be hollow. The sections may form part of a corrugated tube or they may surround a rigid core whose inner diameter remains constant during axial and/or radial compression of the roll.