A method and apparatus for extrusion of an article is provided. A die assembly can apply flows of thermoplastic material to an array of reinforcing cables to form a composite extrusion. A slider fabric can be bonded to one side of the composite extrusion. After exiting the die assembly, the slider fabric can act to support the extrudate as it passes along an elongate mandrel, which can cause the base of the slider fabric to change shape from a flat profile to the final internal profile of the article. The extruded article can then be cooled to solidify the material. The die can include cooling for the slider fabric and means for promoting penetration of the thermoplastic into reinforcing cables.

A method of and apparatus for extruding an article of uniform cross-section, the article including a thermoplastic material and at least one cable for inhibiting stretch of the article. The cable is supplied to a respective tube and is conveyed between upstream and downstream ends. The thermoplastic material may be supplied to the downstream end of the tube. The thermoplastic material is brought together with the cable to embed the cable within the thermoplastic material, thereby forming a composite extrudate. The tube is configured to at least hinder movement of loose windings of the cable from the downstream end towards the upstream end, which may prevent or at least reduce incidence of birdcaging.

Provide a manufacturing method and a manufacturing device for a rubber strip capable of stably manufacturing a tape-like rubber strip of unvulcanized rubber. The rubber strip manufacturing device (1) for manufacturing a tape-like rubber strip (G2) made of unvulcanized rubber is characterized in including: a rubber extruder (3) comprising a rubber extruder main body (6) having a screw shaft (6c) for kneading and pushing the unvulcanized rubber toward an outlet opening (6d), and a gear pump (7) connected to the outlet opening (6d) of the rubber extruder main body (6) and rotary-driven by a first motor (M1); a calender head (4) comprising a pair of calender rollers (4a,4b) for rolling a shaped rubber body extruded from the rubber extruder (3) to obtain the rubber strip (G2); and a control unit (70) for controlling a second motor (M2) for rotary-driving the calender rollers in conjunction with the first motor (M1).

A calibration cage for the production of a blown film is provided. It has a supporting structure and a plurality of frames rotatable in the horizontal plane which are pivoted along the perimeter of the supporting structure at the vertices of a regular polygon, each frame carrying a vertical rod rotatable with respect thereto which in turn carries at least one element for guiding a blown film, each vertical rod being connected to the vertical rods adjacent thereto through connection elements that are rigid in the horizontal plane yet have a length variable in the plane, each connection element being pivoted between two horizontal pivots each of which forms with a vertical radial plane having the axis of rotation of the respective vertical rod an angle that is equal to half of the internal angle () of the regular polygon.

The present invention relates to a roller device for treating sheet-form material, in particular for smoothing films (F*) or sheets, comprising a first roller unit 1 and a second roller unit 2, wherein each roller unit (1, 2) comprises: at least one drive motor with a motor moment of inertia J.sub.M, a roller (10, 20) with a roller moment of inertia J.sub.W, and at least one gear for the kinematic coupling of the roller (10, 20) to the at least one drive motor with a transmission ratio i.sub.MW between the at least one drive motor and the roller (10, 20),
wherein the roller (20) of the second roller unit (2) is rotatable in the opposite direction to the roller (10) of the first roller unit (1), and wherein there is formed between the roller (10) of the first roller unit (1) and the roller (20) of the second roller unit (2) a first roller gap (40) through which the sheet-form material (F) is guided. According to the invention, the roller device is characterized in that in at least one of the first and second roller units (1, 2), the moment of inertia/speed ratio between the at least one drive motor and the roller (10, 20) M.sub.MW is 6 and the transmission ratio 1<i.sub.MW40 is chosen,
wherein $M_{\mathrm{MW}}=\frac{J_M}{J_W}.Math.i_{\mathrm{MW}}^2$
where $i_{\mathrm{MW}}=\left(\frac{n_M}{n_W}\right)$
where n.sub.M: speed of the drive motor and n.sub.W: speed of the roller (10, 20). The invention relates further to a smoothing device for smoothing films or sheets, and to a process for the production of sheet-form material, in particular of films or sheets.

An assembly and process for forming a two stage extruded pipe having a central inner sleeve and a pair of outer attached lobes. The central sleeve shaped (also termed a grout receiving tube) is produced in an initial extrusion operation, following which it enters a cross head operation where a pair of outer lobes are attached to cross sectional exterior surface locations according to a second stage extrusion operation so as to be integrally formed therewith. Other steps include cooling of the dual stage extruded pipe, as well as sectioning and stacking the pipe. Additional steps include forming elongated slots or apertures into the central sleeve portion of the finished extrusion, such in non-interfering fashion with the individual passageway defining and lobes.

A device for forming and cooling an initially hot and therefore flowable melted cheese having (a) a first metallic cooling belt capable of moving in a downstream direction; (b) a counter-pressure roller proximal to the first metallic cooling belt; and (c) a rotatable shaping roller disposed proximal to the first metallic cooling belt downstream of the supply nozzle and upstream from the counter-pressure roller, wherein the rotatable shaping roller has a number of molding cavities formed in the surface, which are separated from one another by separating webs, wherein the separating webs are formed by the remaining surface of the rotatable shaping roller, wherein the rotatable shaping roller is capable of applying a pressure by way of the separating webs onto the cooling belt that results in displacement of the still-hot melted cheese from a region of the separating webs lying thereon, so that shaped bodies of melted cheese released from the molding cavities remain on the first metallic cooling belt for cooling.

A method for nipping and cooling plastic sheet material and a multi-nip takeoff and cooling section having a first smoothing and a second smoothing roll. A position, calibration and cooling roll is positioned proximate to the second smoothing roll. The position, calibration and cooling roll is movable relative to the second smoothing roll. A first fixed calibration and cooling roll is positioned proximate the position, calibration and cooling roll. The first fixed calibration and cooling roll is in a fixed position relative to the second smoothing roll. A first movable calibration and cooling roll is positioned proximate the first fixed calibration and cooling roll The first movable calibration and cooling roll is movable relative to the first fixed calibration and cooling roll. Actuators cooperate with the position, calibration and cooling roll and the first movable cooling roll to provide both nip pressure and gap control.

An assembly and process for forming a two stage extruded pipe having a central inner sleeve and a pair of outer attached lobes. The central sleeve shaped (also termed a grout receiving tube) is produced in an initial extrusion operation, following which it enters a cross head operation where a pair of outer lobes are attached to cross sectional exterior surface locations according to a second stage extrusion operation so as to be integrally formed therewith. Other steps include cooling of the dual stage extruded pipe, as well as sectioning and stacking the pipe. Additional steps include forming elongated slots or apertures into the central sleeve portion of the finished extrusion, such in non-interfering fashion with the individual passageway defining and lobes.

A system for preparing a cross-linked polyethylene a (PEX-a) pipe. The system includes a heating device with a chamber having a central axis, an inlet, and an outlet; oscillating infrared (IR) lamps and a water-cooling apparatus for cooling the temperature in the chamber, and a controller having a program code for regulating oscillation of the IR lamp, an extruder for conveying a cross-linkable feedstock into the chamber, and a pipe head for forming the PEX-a pipe.