Abstract: In the process described, a limited number of shaping tools (T.sub.1, T.sub.2, . . . , T.sub.N) having standardized parameters (for the production of the following contact lens parameters: contact lens diameter, radius of curvature of the rear face of the contact lens, vertex refraction) is used for the manufacture of standardized moulds (M.sub.1, M.sub.2, . . . , M.sub.N). Preferably by material-removing machining of the moulds, moulds are produced that have additional altered parameters. The multiplicity of moulds produced in that manner is used for the one-step manufacture (F) of contact lenses (L) having different parameters that largely do not have to be finished.

Abstract: A method of making a flanged pipe length includes flaring a metal pipe by rotating a grooved tool about the inside of the pipe and introducing a plastic tubular sleeve into the pipe. The tubular sleeve is subsequently heated and forced against the flanged portion of the metal pipe whereby the plastic material assumes a shape complementing the projections formed by the grooved tool.

Abstract: Molded cosmetic products, containing a uniform ultra glossy wet look surface finish are molded in polymeric molds or mold inserts whose inner walls have been modified by subjecting them to a plasma treatment. This allows an improved release of the products and imparts the wet look surface finish to the cosmetic products.

Abstract: The invention relates to the production of ultra thin films. This process involves the biaxial stretching of at least two films wherein the joining of these films has been improved by electric corona discharge treatment.

Abstract: A process for continuously producing a heat-vulcanizable silicone rubber compound, which includes the steps of:(i) mixing (A) a diorganopolysiloxane having a viscosity as measured at 25.degree. C. of 1.times.10.sup.5 cP or more, (B) an inorganic filler and (C) a processing aid, as basic ingredients, by a high-speed mechanical shearing machine, thereby to obtain a flowable particulate mixture in which each ingredient is present in a substantially uniformly and finely dispersed state, and(ii) continuously feeding, at a constant feed rate, said particulate mixture to a continuously kneading and extruding machine through a feed opening thereof, which machine has two screws rotating in the same direction, thereby to obtain a homogeneous silicone rubber compound from a discharge opening of said kneading and extruding machine.

Abstract: Process for manufacturing supported, solid, polymeric sheets from: (I) liquids containing components reactable to polymers; and (II) one or more indefinitely long, foraminous substrates. A more or less continuous sandwich is formed of such substrate(s) and, faced on each side of the substrates as a group, film extending beyond the lateral edges of the substrate(s), the plane of the sandwich deviating from vertical by not more than about 45 degrees.

Abstract: A process for producing cellulose triacetate films that is capable of not only suppressing the growth of foreign matter on transport rollers, but also markedly reducing the necessary number of cleaning operations. The process includes steps of casting a solution of cellulose triacetate onto a support having it surface cooled at 20.degree. C. or below, drying and cooling the solution cast onto the support to solidify the cast solution, separating the subsequently solidified film from the support, and transporting the film while it dries on transport rollers. In accordance with the invention, for a weight proportion of the solvents in the film as separated from the support of at least 40 wt %, the surface of the transport rollers is made of a material having a surface energy of no more than 80 dynes/cm at 20.degree. C.

Abstract: This invention relates to an injection moulding process for the manufacture of multi-layered articles, especially articles having barrier properties. The process includes clamping a thermoplastic film over the cavity of a mould of an injection moulding process, the film being capable of being stretched. The film is then stretched within the mould by inserting the core of the mould, preferably using a core in which a central part enters the mould and partially stretches the film prior to the remainder of the core entering the mould. The mould is then closed, excess film is trimmed off and polymer is injected into the mould cavity. The resultant article is a multi-layered injection moulded article which, depending on the characteristics of the film and injected polymer, may have barrier properties to oxygen, liquids or the like that are superior to articles moulded from only the polymer. The process is particularly useful in the moulding of containers having a depth:width ratio of at least 0.5.

Abstract: An apparatus for inserting a coil of wire into a pipe which includes a rotatable drum for taking up a coil of spring wire, a guide for guiding the coil drawn from the rotatable drum, a push-pull device for applying external forces to the coil for feeding the coil into the pipe and retracting the coil out of the pipe, and a motor for rotating the guide and/or the drum. The drum and the guide are formed separately and are rotatable independently of each other, which rotation results in rotation of the coil of spring wire. The coil of wire has a rectangular or trapezoidal cross-section which enables the wire to effectively run through bends in the pipe without deforming or breaking.

Abstract: A method of manufacturing an inner lined pipe in which a lining layer is formed to the inner circumferential surface of a pipe using a centrifugal molding method, wherein a resin mortar material and a hardening agent for lining are mixed at the top end of an arm member of a supply device and discharged, thereby enabling to select a lining material of a short pot life to attain efficient production, as well as eliminate wasteful consumption of the lining material.

Abstract: A core for producing a molded resin product having a bent hollow portion, including two-forked and multi-forked products used as parts for automobiles, and a process for producing the aforesaid resin product having a bent hollow portion by using said core.

Abstract: According to the invention, calibrated rings are obtained by superficially vulcanizing extruded or profiled extrudate at the exit of an extrusion head (T), then by cutting this vulcanized extrudate into portions by means of a conical cutting device (C), subsequently by butting the two ends, in the respective form of a conical tip and a funnel, of each portion (t) together under hot conditions and under a controlled pressure, in order to obtain a ring blank which is then engaged between the half-cavities of a mold (Mo), where it undergoes shaping and vulcanization by the heating of the latter and thereafter deburring as a result of a shearing action produced by a push device (D) causing the half-cavities to slide in the closed position in the frame of the mold, before causing the opening of the latter by means of a device (G) and the release of the calibrated and superficially clean ring obtained.

Abstract: The color of a polymer, particularly polytetrahydrofuran, is improved by subjecting the polymer to microwave energy of such magnitude and frequency so as to cause a decrease in the APHA color number.

Abstract: A crystalline resin sheet having one, smooth surface and the other, roughened surface is produced by extruding a melt of the resin through a die to form a molten sheet, the molten sheet being subsequently contacted, at only one of the both surfaces thereof, with a cooled, smooth surface maintained at a temperature lower by 20.degree.-90.degree. C. than the melting point of the resin to solidify the molten sheet and to make the contacted surface of the sheet smooth. The other surface of the sheet which has not been contacted with a cooled surface becomes roughened because of the crystallization of the resin.

Abstract: A solvent based plastics recycling process directly reduces large volumes of post consumer plastic waste materials by up to 500% by volume. Minimal sorting and no cleaning is required, and large percentages of contaminants are tolerated. The process yields a highly adhesive resin which cures to a hard wood or masonry type material. The reduced end product, an epoxy sludge, may be formed to provide a lumber or brick substitute. Large percentages of shredded paper and other waste materials, including metals, may be added to the plastic waste materials, if desired.

Abstract: Apparatus for producing sheets or foils of plastic or rubber mixtures includes a calender having two rollers rotatably supported by spaced calender stands with a gap between the rollers and an extruder having an extruder head with wide mouth for extruding a sheet of material into the roller gap of the calender. One part of the extruder head is fixed while another part is pivoted for movement relative to the fixed part by a cylinder-piston unit. The calender is stationary while the extruder is mounted by screws, providing vertical adjustment, on a base having wheels for horizontal movement of the extruder toward and away from the calender to vary the distance between the extruder mouth and the roller gap of the calender. The base of the extruder is coupled with the calender by a threaded spindle rotatable through a reducing drive by a reversible motor to move the extruder toward and away from the calender.

Abstract: Continuous process and apparatus form products from thermoplastic materials between top and bottom mold carriages. A flexible silicone rubber mold adhered to a fiber belt continuously moves around each carriage frame. A surface of desired shape on one rubber mold mates with the desired shape of an opposed rubber mold surface forming a continuously moving mold channel into which is fed hot thermoplastic material at moldable temperature. After discharging the molded plastic product from the moving mold channel, localized surface heat in the molds resulting from contact with hot plastic is removed from the belt molds by blowing cold air onto mold surfaces. Each carriage frame includes a back-up plate coated with low friction coefficient material over which slides a continuously moving belt mold. These slippery plates have numerous air-bearing holes feeding high pressure air between them and the respective moving fiber belt for reducing friction and wear.

Abstract: An extrusion and calendering method is provided to produce a plastic panel, in particular for the lining of concrete containers, having strongly undercut anchoring elements. These protrusions preferably include flat-shaped wings which are arranged approximately V-shaped, forming an angle with and being offset in their width from each other. The leading wing upon the manufacturing process has a smaller angle to the normal through the panel base. The wings may also, differing from the rectangular cross sectional shape described, have a round, oval, elliptical or square cross section.

Abstract: A process for preparing molded polymeric products including reacting a polyisocyanate with an active hydrogen-containing composition having internal mold release components. In the process, the active hydrogen-containing composition contains (a) a primary or secondary amine, (b) a metal salt of an organic material having a carboxylic acid group and a siloxane chain wherein, said metal is selected from Groups I-B, II-B, IV-B, V-B, VI-B, VII-B or VIII, and optionally (c) an organic material containing at least one carboxylic acid group, phosphorus-containing acid group or boron-containing acid group wherein said organic material contains a siloxane chain or contains a terminal or pendant aliphatic hydrocarbon chain.

Abstract: A method of producing shaped articles having excellent impact resistance which includes melt-molding a composition derived from a saponified ethylene-vinyl acetate copolymer (A) by incorporating therein an ethylene-propylene copolymer elastomer (B) and a graft polymer (C) obtained by grafting an ethylenically unsaturated carboxylic acid or a derivative thereof to a polyolefin resin and reacting the resulting grafting product further with a polyamide oligomer or polyamide.