Abstract:
A method of injection moulding an article, the method comprising the steps of: (a) providing an injection mould comprising a plurality of mould parts defining a mould cavity of the injection mould, the plurality of mould parts including first and second movable mould parts, the injection mould further comprising an injection inlet for injecting molten thermoplastic resin material into the mould cavity, wherein the injection inlet is located in the vicinity of the first movable mould part and the second movable mould part is remote from the injection inlet; (b) disposing the first and second movable mould parts in a first configuration so as to define a first intermediate moulding cavity, in which first configuration the first movable mould part is in a first rearward position and the second movable mould part is in a first forward position; (c) injecting molten thermoplastic resin material into the first intermediate moulding cavity through the injection inlet to fill the first intermediate moulding cavity with the molten material; (d) closing the injection inlet; (e) after commencement of the injecting step and at least partly after the closing step, moving the second movable mould part from the first forward position to a second rearward position; (f) moving the first movable mould part from the first rearward position to a second forward position; and (g) moving the second movable mould part from the second rearward position to a third forward position thereby to dispose the first and second movable mould parts in a final configuration so as to define a final moulding cavity of the injection mould filled with the molten material, the final moulding cavity defining a cavity outer surface which defines the outer shape of the article to be moulded.
Abstract:
In a stator injection molding centralization technique, a mold core is disposed inside a stator tube, thereby forming an annulus between the stator tube and mold core. The mold core includes a pitch length defined between a first and second lobe tip of the mold core. A centralizing member is positioned in the annulus, which has a length at least as long as the pitch length of the mold core. During the injection molding process, elastomeric material is injected into the annulus behind the centralizing member, which is located adjacent to the injection point. As the elastomer is injected, it displaces the centralizing member ahead of it along the annulus. As the centralizing member moves through the annulus, it supports the mold core, thus preventing the sag effect.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren der Beeinflussung einer Orientierung von Füllstoffen (122) in einer Kunststoffschmelze (112) während einer Herstellung eines Formkörpers in einem Spritzgießverfahren. Das Verfahren weist die folgenden Schritte auf: a) Bereitstellen eines Werkzeugs (116), welches mindestens eine Kavität (114) zur Aufnahme einer Kunststoffschmelze (112) aufweist; b) Einbringen der Kunststoffschmelze (112) in die Kavität (114) unter Druck; c) Aufbringen eines Druckes auf die Kunststoff schmelze (112) in der Kavität (114); d) Abkühlen oder Abkühlenlassen der Kunststoffschmelze (112) in der Kavität (114) zumindest teilweise unter Aufrechterhaltung des Drucks, wodurch der Formkörper gebildet wird; und e) Entformen des Formkörpers aus der Kavität (114); Erfindungsgemäß wird während Schritt b) und/oder während Schritt c) mindestens ein Öffnungshub (132) in Form eines Öffnens mindestens eines Teilbereichs der Kavität (114) derart vorgenommen, dass in zumindest einem Teil der in der Kavität (114) vorliegenden Kunststoffschmelze (112) Quell- und/oder Dehn-strömungen, welche die Orientierung der Füllstoffe (122) in der Kunststoffschmelze (112) beeinflussen, hervorgerufen werden, und im Anschluss an den Öffnungshub (132) das Aufbringen eines Druckes auf die Kunststoffschmelze (112) gemäß Schritt c) erfolgt.
Abstract:
The invention relates to a method and to a device for producing endless strands, particularly plastic strands having structure in the longitudinal axis. According to the invention, form elements (14, 15) bounding a form cavity (4) are brought together and aligned with each other in rows for making a form cavity (4), the form cavity (4) is moved in the longitudinal axis of the rows and casting material is brought into the form cavity (4) at a gate location running against the direction of motion through a side opening (5) of the form cavity (4), and the form cavity is opened continuously at a distance from the gate location while moving the form elements apart, in order to demold an endless strand solidified in the form cavity (4).
Abstract:
Apparatus for moulding an article, the apparatus comprising a die set having a cavity; a movable cavity tool for elongating the cavity during injection of a material to form at least a first portion of the article; the movable cavity tool receiving and retaining injected material as the cavity elongates. A corresponding method is also disclosed.
Abstract:
Die Erfindung betrifft eine Spritzgießanlage mit einer ortsfesten und einer beweglichen Maschinenaufspannplatte (40, 50) und zumindest einem Spritzaggregat (31 ), sowie mit einer zwischen den Maschinenaufspannplatten (40, 50) angeordneten Spritzgießeinrichtung zum Herstellen profilierter, zumindest abschnittsweise länglicher Bauteile, mit der einen Maschinenaufspannplatte (40) zugeordneten schließseitigen Komponenten (31 ), mit der anderen Maschinenaufspannplatte (50) zugeordneten düsenseitigen Komponenten (30), sowie mit einem zwischen diesen Komponenten (30, 31 ) angeordneten Schlittenmodul (32) mit einem an einer schließ- oder düsenseitigen Komponente beweglich gelagerten Schlitten (2), welcher ein ursprüngliches Formnest (8) mitbildet, und mit einem Antriebsmodul (33) zur Steuerung der Bewegung des, oder der beweglichen Teile(s) (2, 10) des Schlittenmoduls (32), wobei über eine Bewegung des Schlittens (2) der Bauteil inner- und au ßerhalb der Form in vorgesehen Größe und Gestalt hergestellt wird. Es ist eine zumindest teilweise funktionelle Integration zumindest der schließseitigen Komponenten (31 ) und/oder des Antriebsmoduls (33) und/oder des Schlittenmoduls (32) in ein oder mehrere Bestandteil(e) der Anlage vorgenommen.
Abstract:
A method of molding a local part by low pressurization capable of accurately molding a resin-injection molded gear at a low pressurizing pressure by using a standard type molding machine having an eject pin compressing mechanism and taking out a large number of resin-injection molded gears at a time. The resin-injection molded gear (10) formed of a cylindrically formed rim (11), teeth (13) formed on the outer peripheral surface of the rim (11) outward from the center axis (12) of the cylinder thereof, a web (15) joined to the inner peripheral surface of the rim (11) and extending from the inner peripheral surface to the center axis (12) in a flat disk shape, and bosses (16) joined to the web (15) and formed at the center part of the center axis (12) is integrally injection-molded by a resin. The pressurization of the web (15) is started at a pressurization start time T1 which is 300 to 400% of a time T4 between a time when filling is started and a time when gate seal is completed according to a filling start standard by using a pressurizing pressure P of 5 to 45 Mpa, and the pressurization time T is held within the pressurizing pressure for a time of 120 to 150% of the time T4.
Abstract:
The invention relates to bristle products comprising at least one support with bristles consisting of a pourable plastic arranged thereon. Said products are manufactured in the following way: the support is provided with perforations, which act as spinnerets and are attached to bristle-forming channels and a plastic melt for the bristles is extruded into the channels by injection moulding from at least one side of the support, (the supply side of the melt), through the perforations, to form the bristles. The perforations have a smallest width of
Abstract:
Disclosed is an adjusting and regulating device for at least one hot channel or cold channel (9a) that is connected to a die cavity (1a) in a plastic form tool. A needle element (14) is provided in the at least one channel (9a, 60). The needle element can be displaced lengthwise inside the channel (9a), using a drive device (27). According to the invention, the needle element (14) is combined with a screw spindle (13) that is screwed into a nut (16). The screw spindle (13) or the nut (16) can be rotationally driven by a drive device (27) so that the needle element (14) can be displaced in an axially defined manner in relation to the die cavity (1a) at will.