Abstract:
The present invention relates to a method enabling either the selection, the modification of existing and/or the creation of newly developed polymer materials which may provide an improved response to the application of a local shear and/or extensional deformation inside the polymer melt in different manufacturing technologies such as and without being exclusive injection molding (IM), injection stretch blow molding (ISBM), direct injection (DI), extrusion blow molding (EBM), sheet extrusion, thermoforming, etc. In addition, a method for manufacturing a polymer article is provided comprising injecting or extruding a molten polypropylene, polyethylene or polyester based polymer for converting it into a (semi) final shape while applying a shear and/or extensional deformation on the polymer melt, wherein applying shear and/or extensional deformation on the polymer melt comprises selectively modifying the flow path of the molten semi-crystallizable polymer as a function of local pressure profile over at least part of the flow path, said local pressure profile being determined as a function of optimized response of the polymer melt to the applied local shear and/or extensional deformation over at least said part of the flow path.
Abstract:
Disclosed is an apparatus (200) and a method to extrude a honeycomb, providing correction in bowing of the extruded honeycomb structure, employs a deflector device (100) having a base plate (112) including an opening (134) aligned in a direction parallel to the extrusion axis (A) through which the plastic material is conveyed to the die (12). The deflector device (100) includes a bow plate (130) movably mounted to the downstream or upstream side of the base plate (112). The bow plate (130) includes a constant area aperture (134). The deflector device (100) positioned upstream of extrusion die (12) imparts a degree of bow reduction by the position of the constant area aperture (134) over the opening (132) imparting a pressure drop gradient on the flow stream entering the die (12).
Abstract:
Disclosed is a wetted type calibrator for manufacturing a window frame and a manufactruing device including the same, in which an intensive cooling system having the wetted type calibrator including multiple disk parts is disposed at a next process of an extrusion molding process so as to enhance cooling effect. The wetted type calibrator for manufacturing the window frame includes a houwing which accommdates a desired amount of water therein; and a calibrator assembly which is disposed in the housing so that an extruded product formed of a synthetic resin material is passed therethrough. The apparatus for manufacturing the window frame includes an extruder in which functions to a raw mater injected through a hopper is heated and melted in a heating cylinder having a heater and then the melted material is extruded by rotation of a screw; an extrusion die by which the gel-state material supplied through the extruder is formed into a desired shape; a wetted type calibrator which forms a profile shape of the product passed through the extrusion die and also forms the product having a precise dimension and shape; a water tank which cools the extruded product passed through the wetted type calibrator; an extracting device which pulls the extruded product passed through the water tank with constant foce; and a cutting device which cuts the extruded product in a desired size.
Abstract:
A process for preparing a blend of thermoplastic polymer and resin modifier within a single- screw extruder, wherein the resin modifier is a hydrocarbon resin. The single-screw extruder is designed to have a screw with a compression ratio of at least 1.2. The compression ratio is the ratio of the screw depth at the feed section (30) to the screw depth at the metering section (34).
Abstract:
A method for additive delivery during a plastics processing is disclosed. The method includes establishing a network of components in a control loop that uses a feedback method to drive at least one pump, thus enabling continuous, robust proportioning of additive in a difficult to control environment. The feedback method includes sending at least one signal from at least one sensor associated with a plastics melting machine to a controller, sending one or more signals from the controller to the at least one pump, monitoring the pressure in the at least one pump and sensing the position of an injection nozzle valve, and sending one or more signals to the injection nozzle valve instructing the valve to open or close.
Abstract:
A slot die assembly for applying at least one material onto a substrate includes an adapter having a passive heat transfer device, a shim package fluidically connected to the adapter, the shim package having a first material discharge slot and a second material discharge slot, and a die plate having a one or more fluid channels fluidically connected to the shim package. The assembly also includes one or more mounting studs extending from the adapter, the mounting studs configured to engage a parent machine.
Abstract:
A blown-film extrusion apparatus for manufacturing a tubular polymer film (1) comprises an extruder (2); a solidification ring for solidifying a tubular element produced by the extruder and for forming the film by delivering cooling air on the tubular element at a given cooling height, and a film conveyor for conveying the film upwards. The apparatus also comprises a delivery device (80) for projecting correction air on the tubular element, in order to locally correct the thickness of the film, comprising a distribution chamber (78); a plurality of air delivery members (81') with delivery channels (37) whose delivery mouths (33',33") are arranged about said axis (25) of the apparatus for projecting correction air partial streams (19') on respective angular correction positions, between the die and the cooling height; flow control elements (68) between the distribution chamber (78), and the inlet (32) of respective air delivery members, configured for adjusting the flowrate of the respective correction air stream (19') according to an adjustment signal. According to an aspect of the invention, a plurality of separate radial ducts (45) is provided defining respective delivery channels (37) and spaced apart, at an own end portion, by separation spaces, so that the correction air partial streams, after hitting the tubular element in the respective angular correction positions, can flow away from the tubular element through said separation spaces. According to another aspect of the invention, the distribution chamber (78) is defined by an upper ring (161) and by a lower ring (159) connected to each other by means of tight fixed joints with a first substantially cylindrical wall (151) and with a second substantially cylindrical wall arranged around the first cylindrical wall, wherein possible separate radial ducts of the air delivery members protrude from the first cylindrical wall (151).
Abstract:
Die Erfindung betrifft eine Vorrichtung zum Herstellen und/oder Auftragen eines aus zumindest zwei Flächenbereichen (1, 2) gebildeten, im Wesentlichen flächigen Materialverbunds (3) vorgebbarer Verbundbreite (4), vorgebbarer Verbundhöhe (5) und/oder vorgebbarer Verbundlänge (6). Die Vorrichtung umfasst eine eine Transportrichtung (y) festlegende Transporteinrichtung (9) mit einer Transportfläche (11). Außerdem umfasst die Vorrichtung eine Auftrageinrichtung (7) mit einer einen schlitzförmigen, im Wesentlichen quer zur Auftragrichtung (y) angeordneten Auslass (24) aufweisenden Auftragdüse (8), mit welcher der erste Flächenbereich (1) aus einem ersten Extrudat (21) und der zweite Flächenbereich (2) aus einem zweiten Extrudat (21') auf die Transportfläche (11) extrudierbar ist. Die Auftragdüse (8) umfasst zumindest eine Fördereinrichtung (22; 22') zum Fördern eines Extrudates (21, 21') auf die Transportfläche (11). Mit der Fördereinrichtung (22) ist das Fördervolumen, die Fördermasse, die Fördergeschwindigkeit und/oder die Förderdauer zumindest eines der Extrudate (21, 21') steuerbar.
Abstract:
A check valve (36, 136) for a screw (24) is provided. The check valve (36, 136) includes a retainer tip (54, 154), operable to be attached to a distal end of a screw shaft (52, 152), the retainer tip (54, 154) defining at least one melt channel (30). A first ring (60) is coaxially mounted to and rotationally-coupled with the retainer tip (54, 154). A second ring (66) is coaxially and slidably mounted to the retainer tip (54, 154), and is operable to rotate relative to the retainer tip (54, 154). The second ring (66) is operable to reversibly move between an open position which permits melt to flow through the check valve (36, 136) and a closed position which prevents backflow of the melt.