Abstract: Coloring composition for coloring thermoplastic polymers obtained by solidifying a liquid mixture of coloring pigments and an ester of phtalic acid and an alcohol. The composition contains at least 40% of pigments and at most 60% of an ester of phtalic acid and an alcohol comprising 12 to 16 carbon atoms.

Abstract: A plastic pipe comprises an inner wall and an outer wall, being integral with longitudinal partitions between them and bounding longitudinally extending channels and a circumferential, helically, or non-helically extending groove, which groove has been formed by closing the channels by pressing channel wall parts onto each other. A retaining ring may be snapped into an external groove.

Abstract: Socket pipe of thermoplastics having a groove with longitudinally extending additional recess, which groove is bound by a radially extending head portion.

Abstract: A fiber reinforced plastic pipe is provided with an integral flange, comprising circumferentially extending glass fiber fabrics. As the width of the fabrics exceeds the width of the finished flange, the fabrics are provided with inwardly bent parts at one or both side walls of the flange, or with undulating parts.

Abstract: An apparatus for forming a plastic pipe having a circular cross-section and elongated longitudinal channels in the pipe wall is disclosed. A mass of synthetic plastic material is pressed through an annular space defined by inner and outer annular supports, the annular space having a plurality of spaced pin supports concentrically disposed therein and regulating the quantity of material flow through the annular space, depending on the shape of the pin supports, by selectively moving the walls of the annular supports closer to each other. In a particularly advantageous embodiment, either the wall of the inner annular support or the wall of the outer annular support, or both, are moved closer to each other in the area between adjacent pin supports.

Abstract: Method and extruder for manufacturing plastic pipes provided with longitudinal channels in its wall. Before the extrusion nozzle of the extruder, the stream of plastics to be extruded for forming the pipe is subdivided into two concentric annular streams flowing through two annular division channels formed by means of a dividing member being retained by only a breaker in the outer division channel, the other division channel forming a free passage between the channel inlet and the outlet.

Abstract: A plastic pallet provided with oblong channels in which reinforcing rods are locked. The locking is obtained by partially closing the end of a channel or by inwardly shrunk edge parts of openings in said channels.

Abstract: A pipe part comprising an abutment-edge and a retaining ring being interconnected by means of retaining strips or dumb-bells which dumb-bells or strips will yield under a load without breaking. The pipe part consists of a polyolefin, preferably a polypropylene.

Abstract: A crate 1 for bottles with cylindrical body portions has double-skinned corner portions 7 which define with portions 13 of an internal partitioning grid 5 corner compartments 6a for bottles. The inner skin 12 of the corner portion is formed with vertical ribs 14 adjacent the grid portions 13. These ribs, which are interconnected with the outer skin 8 of the corner portion to form hollow columns 14a therewith, strength the corner portions and allow the spacing of the skins thereof to be reduced so that the size of the compartment can be increased for given external crate dimensions, and as the ribs are located adjacent the partitioning portions 13 they occupy space which would otherwise be free and do not reduce the effective size of the corner compartments.

Abstract: This invention relates to a method of making a tube of thermoplastic material, comprising longitudinal channels of circular cross-section and having such wall stresses that, after axially cutting the tube, the edge parts along the cut edge overlap each other for less than 8% of the outer circumference of the tube.

Abstract: A sealing ring is installed in a groove chamber of a socket by impressing said sealing ring and pushing the impressed sealing ring into the socket, whereafter the impression is terminated and the sealing ring is received in a groove chamber.An apparatus for carrying out the method comprises a sealing ring impression member and sealing ring retaining means for maintaining the sealing ring in the impressed state.

Abstract: A gutter fitting 1 comprises a body member 2 defining a channel for receiving a gutter length. A sealing member 6 extends through a slot 7 in the body member and has a sealing portion 10 for sealing against the gutter length and a retaining portion 11 which extends transversely of the slot 7 and is clamped in a passage 12 between the body member 2 and a clip 13 which snap fits over the opposite longitudinal edges--one edge 8 only shown--of the channel to clamp the gutter length in the channel. The sealing member is thereby adequately retained in the fitting against displacement.

Abstract: A cage construction for use in breeding fur-bearing animals such as mink, comprises a plurality of cages arranged on a stand, whereby each cage is provided with a breeding coop with an opening giving access to the cage. Each breeding coop is formed by a vertical plastic pipe open at both ends and having a substantially rectangular cross section, the pipe wall being formed by a central foam plastic layer and an outer and an inner solid surface layer. These layers are integrally connected.

Abstract: Plastics pipes comprising an inner and outer wall being interconnected by lengthwise extending connecting partitions, forming channels, the ends of the channels being each separately sealed by sealingly pressing the end walls of a channel to each other after these walls have been heated to a temperature surpassing the plasticizing temperature.

Abstract: A branch piece for pipe-lines comprising a first part and a second part for forming a cylindrical housing, each of the two parts being provided with a coupling edge for engaging a connecting or closing part. The parts are provided with wedge-shaped tongues which fit in complementary wedge-shaped recesses in the other parts.

Abstract: A pipe having a sealing member (3) in an inner groove (2) at one pipe end (1). The sealing member provides a very effective seal relative to a spigot end (1a) of another pipe inserted in the pipe in question. The free ends of lip portions (6,7) of a sealing ring (4) (the cross section of which is of V-shape when undeformed) are provided with beads (8) so that behind a stiffening ring (5) surrounding said sealing ring (4) there is more volume of lip material than there is room for in the space confined by the adjacent part of the bottom of the groove (2), the exterior (1a') of said spigot end (1a), the rearmost sidewall (2') of the groove (2) and the stiffening ring (5). The pipe is preferably a plastic pipe.

Abstract: A tray for packaging fruit comprising a base and converging side walls, is provided with a wide rim at its upper side, said rim being integral with a suspending ledge, while a support can be pushed through an opening in the rim at the corners of the tray and a staggered part of the support fits the ledge, the support also being fixed by cams at the base of the tray.

Abstract: A method of manufacturing a fiber reinforced plastic pipe part, comprising a first wall part and a wall part adjoining the latter through an inner rounded corner transition having a radius of curvature of less than 5 mm, preferably 0,5 to 3 mm.

Abstract: A plastic well pipe comprising an outer wall, an inner wall, and channels formed by longitudinally extending partitions being integral with the walls, the outer wall being provided with bores opening into the channels, while at certain points the inner wall has been removed for recovering liquid from the channels, which liquid flows into the channels through the bores.

Abstract: A composite tubular assembly comprising a membrane for membrane filtration fixed to the inner side of a tube of non woven material, consisting of a wound band of a sealable fibres containing non woven material, which may be helically or non helically wound, consecutive overlapping windings of the band being completely interconnected by ultrasonic heatsealing and thereby forming a smooth inner wall of the tube.