Abstract: A process for the co-extrusion of an inner layer around a conductive medium and an outer layer around the inner layer including:(i) introducing into an extruder adapted for profile coextrusion, a preformed conductive medium; an inner layer formulation including a homogeneous polyethylene having a polydispersity in the range of about 1.5 to about 3.5 and an essentially uniform comonomer distribution, and an organic peroxide; and an outer layer formulation including (A) one of (a) a copolymer of ethylene and an unsaturated ester; (b) or a polyethylene having a polydispersity greater than about 4.0 and a density of at least 0.916 gram per cubic centimeter, said polymer made by a high pressure process; or (c) a heterogeneous copolymer of ethylene and one or more alpha-olefins having a density of less than 0.916 gram per cubic centimeter, a melt index of at least about 4 grams per 10 minutes, and a polydispersity greater than about 4.

Abstract: A process for preparing a biaxially oriented thermoplastic resin film which comprises: extending a thermoplastic resin sheet in a longitudinal and a transverse directions to form a film thereof, and heat treating the film under a temperature gradient descending from both edges to the center of the film along the transverse direction within a zone defined by the following formula (1) by employing a heater which is located over the film with an angle .theta. of the following formula (3) from said both edges to the center of the film to produce a thermoplastic resin film having uniform physical end chemical properties in the transverse direction:0.25.ltoreq.L.sub.1 /W.ltoreq.0.9 (1)tan.theta.=W/2L.sub.1 (3)wherein:L.sub.1 is the distance from the end point of the transverse extending to the end point of the heat treating; andW is the total width of the film.

Abstract: A process for producing a biaxially oriented, transparent, multilayered film having a base layer comprising a mixture of a propylene polymer and a resin having a softening point of about 130.degree. to about 180.degree. C., and at least one additional layer comprising a material which can be readily subjected to corona treatment, comprising the steps of (i) coextruding through a slot die the layers of the film so as to produce a multilayer film, (ii) solidifying the multilayer film by chilling, and (iii) orienting the multilayer film by stretching in the longitudinal and transverse directions.

Abstract: A technique for extrusion of plastic including a first step of extruding which includes extruding at least one layer of a thermally cross-linkable material in an extrusion apparatus (20) having at least one die wall (22); a second step of extruding, performed simultaneously with the first step of extruding, and which includes extruding at least one layer of thermoplastic material in the extrusion apparatus between the thermally cross-linkable material and the at least one die wall (22) and heating the thermally-cross-linkable material, thereby to provide at least a predetermined minimum rate of cross-linking thereof during the steps of extrusion of the plastic.

Abstract: An extrusion die (1) with a calibrated exit orifice (6) for extruding extruded sections (3, 3', 3") of different profile cross-sections onto a glazing or glass plate (2) is provided with an obturating slide (22) movably positioned in front of the calibrate exit orifice (6) through which the die cross-section can be adjusted. The slide (22) is operated by a pneumatic jack (16).

Abstract: A nitrogen-containing compound of the following general formula (1) is kneaded into a resin molding material, the kneaded mixture is molded, and the surface of the resulting article is subjected to corona discharge treatment. Then, an electrostatically charged coating is sprayed on the article. ##STR1## wherein R.sup.1 represents an alkyl group of 6-22 carbon atoms, R.sup.2 and R.sup.3 may be the same or different and each represents an alkyl group of 1-4 carbon atoms; n represents 2-3. In accordance with this invention, a shaped resin article with remarkably improved electrical conductivity can be obtained from a resin of low electrical conductivity substantially without affecting the physical properties and color of the resin and with high productivity. Furthermore, a resin article with high surface resistivity can be electrostatically coated with high coating efficiency and improved results in appearance and productivity substantially without affecting the physical properties of the resin.

Abstract: There is disclosed a method for making a vibration dampener, the dampener cluding a body for disposition between two relatively movable members, the body being formed from a carrier of a gel material and particles having electrorheological properties embedded in the carrier with the particles electrically aligned and pseudo-bonded. The dampener is made by passing a current through a mixture of the particles and the carrier while the carrier cures into a gel material.

Abstract: An apparatus provided for extruding a polymer in an extruder barrel having an upstream portion and a downstream portion with a discharge port. A hopper is positioned for delivering polymer to the upstream portion of the extruder barrel and a screw shaft is mounted for rotational movement in the extruder barrel. A drive means is connected for rotating the screw shaft. The screw shaft has a conveying screw flight and a metering screw flight arranged for conveying and metering the polymer through the barrel. A seal is provided for sealing against polymer flow and includes at least two different passageways positioned between a seal barrel and at least one seal shaft mounted for rotational movement within the seal barrel. The passageways are oriented to urge the polymer toward the screw shaft.

Abstract: A method for the control of wall thickness of an extruded thermoplastic material. The method includes extruding a thermoplastic material from an extruder through a die gap formed between first and second die lips. One of the die lips has a plurality of separate sectors adjacent the die gap, with each sector having a circulating oil passageway therein. The circulating oil passageways are connected in a series along the die gap. The method includes circulating through each circulating oil passage, within each sector adjacent the die lip, a heat transfer oil from a common source at a selected heating or cooling temperature. The method includes controlling the rate of flow of said heat transfer oil in each sector by an adjustable flow control valve, in order to control the temperature of each sector, and thereby to adjust the viscosity of the thermoplastic material being extruded, and controlling the wall thickness of the extruded thermoplastic material.

Abstract: In the present invention, a preliminary extruding operation is carried out for each section of a movable die moving pattern DA corresponding to the configuration of an article, thereby determining a suitable back pressure at which a desired cross-sectional dimension is obtained. The movable die is secured to a position DA1 corresponding to a side section of the article, then screw revolutions are changed while extruding a molding material. Thus, determined as a suitable back pressure BPO for the side section is a specified value of the back pressures BP at which the molded product has the desired cross-sectional dimension. Likewise, a suitable back pressure for the upper section is also determined, so that a pattern of the suitable back pressures BPO is determined. In view of the time delay, timings of change in an initial setting pattern R1 for the screw revolutions are advanced for periods of times T.sub.11, T.sub.12, T.sub.13 and T.sub.14 from the timings of change in the pattern DA.

Abstract: A method of manufacturing an etched extrusion, the method comprising the steps of extruding a thermoplastic material to produce a hot extrusion, and contacting the extrusion, while the extrusion is still hot, with a mixture of at least two fluids having different thermal conductivities so that the extrusion develops an uneven outer surface due to different rates of shrinkage caused by the different thermal conductivities.

Abstract: A compound profile of thermoplastic plastics material and elastomeric material. The thermoplastic plastics material and elastomeric material are chemically bonded by co-vulcanization. A coupling material can be used to promote the chemical bonding.

Abstract: A process for the production of a biaxially-oriented multilayer polypropylene film having a silk-matt finish includes coextruding melts corresponding to the individual layers of the film through a flat-film die; taking off the coextruded film over a take-off roll having a temperature between about 40 and about 100.degree. C.; biaxially stretching the film; thermofixing, and optionally corona-treating, the biaxially-stretched film; and winding up the thermofixed and optionally corona-treated film.

Abstract: A process for producing a modified polypropylene having a very high melt tension and superior stiffness and moldability, and a molded product obtained by using the modified polypropylene are provided.which process includes adding 0.05 to 10 millimols of a cross-linking auxiliary to 100 g of a linear polypropylene, mixing them, irradiating ionizing radiations to the mixture so as to give an absorbed dosage of 1 to 20 kGy, and successively heat-treating the resulting material at 80.degree. to 350.degree. C.,which modified polypropylene has(A) a degree of branching of substantially 1,(B) a relationship between its melt tension (MS) at 230.degree. C. and its intrinsic viscosity (.eta.) measured in tetralin at 230.degree. C. expressed by an inequalitylog (MS)>4.24.times.log [.eta.]-0.915, and(C) a percentage of extraction residue in boiling xylene of 1% by weight or less.

Abstract: A flange of a panel is inserted into an extrusion port of an extrusion molding die through an insertion slit which opens laterally of the extrusion port to thereby form between the extrusion port and the flange a molding space which corresponds to a trim member. A material for a trim member is extruded forwardly of the extrusion port through the molding space, and the die and the flange are moved relatively to each other while adjusting the amount of insertion of the flange into the extrusion port so that a distance between a reference position on the panel and the trim member is maintained at a constant distance. Thus, a trim member is extrusion molded on the edge of the flange of the panel and is mounted thereon simultaneously and yet accurately in a desired outer shape.

Abstract: For the extrusion of a calibrated profile of a thermoplastic polymer onto articles, the polymer, which is melted in an extruder (17), is fed, via a heated pressure hose (22), to an extruder head guided by a robot (5) and, by means of said extruder head, extruded and deposited on the article. At the end of each extrusion operation, the material flow to the extruder head is maintained and, by means of a change-over valve within the extruder head, redirected into an outlet orifice provided in the vicinity of the die orifice until the commencement of the subsequent extrusion operation. The redirected material flow emerges from a pipe connector (29) which is arranged on the extruder head and is coupled to a coupling piece (33). The material collected in this manner may be pelletized and fed back to the feed hopper (16) of the extruder (17).

Abstract: In a process of manufacturing shaped elements from synthetic thermoplastics, particularly polyolefins, such as polyethylene and polypropylene, wherein the plastic material is heated to a temperature above its softening temperature and is shaped in that state to form the shaped element and is subsequently cooled to a temperature below its softening temperature, the shaped elements are shaped in a hot state to form intermediate products having a certain oversize over the desired final dimensions and after they have been cooled are caused by a material-compacting pressing operation to assume the desired final dimensions, in which they are dimensionally stable.

Abstract: Solvent based film is produced in an endless belt casting apparatus (10) in which, within initial compartments (46-52), flows of gas are directed through transversely elongated inlet channels (85.sub.i) to contact a layer (36') of polymer and solvent supported by an endless belt (26) and flows of gas and solvent vapors are withdrawn from the vicinity of the layer by transversely elongated gas plenums (68); within subsequent compartments (54-62), flows of gas are directed through elongated inlet plenums (74) to contact the layer and flows of gas and solvent vapors are withdrawn through transversely elongated exhaust channels (85.sub.o); within all compartments along upper and lower spans of the belt, flows of gas are directed at the inner side (30) of the belt from transversely elongated gas plenums (70) and flows of gas are withdrawn though outlets (72); and within initial compartments (46-52), flows of cooling gas are directed at the edges of the inner side of the belt from cooling nozzles (146,148).

Abstract: An apparatus and a method for producing a floor mat carrying a group of projections with a predetermined shape on a reverse surface to be contacted with a floor, by passing a molding resin material through a nip between a press roll and a mold roll are disclosed.

Abstract: Extrusion die apparatus and an extrusion method for extruding large-cross-section honeycomb structures from plasticized ceramic batch materials are described, the apparatus comprising a die having a support rod connected to its central portion, the support rod being anchored to support means upstream of the die. The support rod and support means act to limit die distortion during extrusion, reducing die strain and stress to levels permitting large honeycomb extrusion without die failure. Dies of optimal thickness are disclosed which reduce the maximum stresses exerted on the die during extrusion.