Abstract:
The invention relates to a process for mixing and/or thermal homogenisation of at least one free-flowing fluid consisting of plastic and/or natural materials. During said process the fluid is distributed on one layer (34), the width (36) thereof (perpendicular to the direction (35) for conveying the fluid) being a multiple larger than the thickness (33) thereof. Individual sections which are adjacent in the direction (35) for conveying the fluid have, in cross-sectional planes at right angles to the conveying direction (35) and arranged in succession in the conveying direction (35), different cross-sectional areas. Each section of the continuous layer (34) extends parallel and directly adjacent each other in the conveying direction (35) and has different spatial deformations. A cross-sectional area in the section is larger than the length of flow paths between two cross-sectional planes, which length is relatively larger than for a linear connection in the conveying direction (35).
Abstract:
Process for manufacturing dimensionally stable profile sections (2) from plastic extrudates, in particular profile sections for windows, provided with protective coatings and/or devices (19, 55, 59, 65) for sealing, damping, covering etc., parts of profile sections or with elastically deformable sealing and/or damping devices (19, 55, 59, 65) which have a higher modulus of elasticity. The profile section (2) is extruded and the protective coating and/or device or sealing and/or damping device (19, 55, 59, 65) are extruded onto the profile section (2) in one and the same operation. On leaving the nozzle (4), the profile section (2) is calibrated and cooled at least until it becomes deformable. A surface region of the profile section (2), on which the protective coating and/or device or sealing and/or damping device (19, 55, 59, 65) are applied, is heated until it at least forms a paste, the protective coating and/or device or sealing and/or damping device (19, 55, 59, 65) are extruded onto the heated region. The extruded profile section (2) is then gripped by a withdrawal device (6).
Abstract:
To coat a group of wires (4) with rubber, said group is passed twice in succession over the same roller (2) and the coating rubber is interposed at two mutually offset axial positions.
Abstract:
The installation comprises an extruder (12) of which the extrusion screw (36) may be axially displaced, a number of moulds (14) arranged horizontally in a molding loop (16), of which a plate (74) may be displaced on its threaded axis (78), thereby bringing the moulds (14) into successive positions of filling, consolidation, cooling and mould removing. A material sensor (53) positioned at an adjustable distance from the rear end of the mould (14) can stop the filling cycle, elastic means (88) being provided for the sealing of the mould (14) after its filling and a device (94, 96) receiving the casting after unmoulding.
Abstract:
Polypropylene composition (PC) comprising (a) first propylene homopolymer (HPP-1) having a MFR 2 (230 ℃, 2.16 kg) measured according to ISO 1133 of at least 45 g/10min, (b) optionally second propylene homopolymer (HPP-2) having a MFR 2 (230 ℃, 2.16 kg) measured according to ISO 1133 of not more than 20 g/10min, and (c) polar modified polypropylene (PMP), wherein the composition does not comprise fibers (FB).
Abstract:
The invention relates to an extruder and a method for extruding cord reinforced tire components, wherein the extruder comprises an extruder head with a die and a cord guide, wherein the die is provided with a cross sectional profile that defines a first cross section of the extrusion material in the die, wherein the cross sectional profile has a profile height, wherein the cord guide is arranged for guiding the cords into the die at a cord entry height, wherein the extruder head is provided with first heating elements, wherein the extruder comprises a control unit that is operationally connected to the first heating elements for generating an adjustable height temperature gradient in the extrusion material across the profile height to control swelling of the extrusion material relative to the cord entry height from the first cross section to a second cross section after the extrusion material leaves the die.
Abstract:
A plant (10) for making a plastic film (11), in particular tubular or in a flat sheet, preferably intended for making sacks, bags and the like, comprising means (12) for forming the film (11) in the form of a bubble (15) starting with a respective molten mass of plastic material, which is fed to the forming means (12) by corresponding means (14) for extruding a relative raw material (13), which comprise a compounding extruder (18).
Abstract:
A material handling and mold filling system is provided which directs the flow of molten plastic material from an extruder and allocates the molten material to a plurality of nozzles through the use of independently operated, variable valves. The system therefore provides independent streams of molten plastic material having variable temperatures and flow rates or volumes to particular sections or regions of the mold. This independent temperature or flow of molten plastic material facilitates the complete, rapid and accurate filling of the molds, reducing turbulence and other temperature or flow-related imperfections in the finished components. A multiphase material handling system is also disclosed for expeditious sequential and simultaneous filling and pressing of the mold and extracting the completed component from the system.
Abstract:
A catheter die (10) is provided and includes a device layer (20) defining a cavity (25) and including a piezoresistive pressure sensor (35) operably disposed proximate to the cavity and an insulator (30) having an opening and being disposed on an upper surface of the device layer such that a portion of the piezoresistive pressure sensor is exposed through the opening. The catheter die further includes an insulation layer (40) bonded to a lower surface of the device layer and first and second bond pads (50, 60), the first bond pad being electrically coupled to the portion of the piezoresistive pressure sensor via the opening and the second bond pad being disposed on the insulation layer.