Abstract: Composite sections of differing cross sectional shapes and sizes can be produced from individual profiles economically by a method in which separate guides are associated with each profile. The guides can be adjusted transversely and vertically. The guides act through guide surfaces which bear upon the top, bottom and both sides of each profile.

Abstract: Sandwich elements in the form of slabs, shells and the like, consisting of facings and a rigid polyurethane foam core can be joined together in an airtight and watertight manner when they are provided with edge profiles which are cast from casting materials forming flexible polyurethane foam and which have a groove and a tongue.

Abstract: Polyol mixtures containing a mixture of internal mold release agents which are storage stable are made up of (a) from about 55 to about 95% by weight of a polyol mixture of (1) 30-70% by weight of at least one polyol with an OH value of more than 700 and (2) from about 30 to about 70% by weight of at least one polyol with an OH value of 700 or less than 700 and (b) from about 5 to about 45% by weight of a mixture of internal mold release agents made up of (1) from about 60 to about 95% by weight of at least one salt-like release agent and (2) from about 5 to about 40% by weight of at least one non-salt-like release agent containing an amide NH function or a urethane NH function. Known auxiliaries and additives may optionally be included. These polyol mixtures are useful in the production of rigid, semirigid and flexible polyurethane materials, particularly molded polyurethanes.

Abstract: A process for the production of composite bodies consisting of a polyurethane core and a polyurethane covering, with the core being positioned inside a mold so that an average distance of at least 0.5 mm exists between the surface of the core and the internal wall of the mold. The gap between the core and the internal wall of the mold is filled with a reaction mixture composed of a) a polyisocyanate component, and b) a polyol component. The polyol component b) must have a weight ratio of carbon to oxygen of at least 2.5:1.

Abstract: The present invention relates to a process and a device for the production of a composite part by the sequential introduction of several fillings (consisting of at least one free-flowing reaction mixture, of which at least one forms a foamed material) into the hollow space of the mold of a closed form tool. A mixing device is attached to form tool. The mixer comprises injector nozzles for the reaction components pointing into a mixing chamber and an ejector piston for the cleaning of the mixer chamber. The ejector piston may be slid forward right up to the outlet orifice of the mixing chamber.

Abstract: The present invention is directed to a tire comprising a three-dimensional wound reinforcement formed from a continuous sheathed filament running diagonally over the region upon which the tread is located and alternating from one tire foot to the other, said filament (i) crossing back and forth over said region, (ii) running into the tire foot tangentially, (iii) running for a relatively long distance in the tire foot, and (iv) crossing over itself over the entire tire shape, said reinforcement resisting forces radially and circumferentially, and an elastomeric material surrounding said reinforcement and to a method of manufacture thereof.

Abstract: The present invention is directed to a process for the production of light-resistant, optionally foamed elastomeric molded polyurethanes by reacting(a) organic polyisocyanates which are either mixtures of isophorone diisocyanate with polyisocyanates containing isocyanurate groups and based on 1,6-diisocyanatohexane or mixtures of IPDI with polyisocyanates containing isocyanurate groups and based on 1,6-diisocyanato-hexane and IPDI with organic compounds containing isocyanate-reactive groups in the presence of catalysts, wherein the components are reacted together inside closed molds in an isocyanate index of about 70 to 130.The present invention is additionally directed to the elastomeric polyurethanes prepared by this process.

Abstract: A first reaction mixture, prepared from (a) isocyanates with isocyanate contents of from 5 to 50% and (b) compounds with molecular weights of from 32 to 10,000 which contain at least two isocyanate-reactive hydrogen atoms, in an equivalent ratio of component "a" to component "b" of 0.8:1 to 5:1, from 0.1 to 20% of a blowing agent and, optionally, other known additives, is introduced into the rigid cavity of a closed mold. After this mixture has become resistant to permeation, but is still compressible, a second reaction mixture, either the same or different from the first reaction mixture, prepared from (c) isocyanates having isocyanate contents of from 5 to 50% and (d) compounds with molecular weights of from 32 to 10,000 which contain at least two isocyanate-reactive hydrogen atoms, in an equivalent ratio of component "c" to component "d" of from 0.

Abstract: The present invention is directed to a process for the production of a molded article having a compact surface layer and a gross density above 900 kg/m.sup.3 via the reaction injection molding technique, comprising introducing a reaction mixture into a closed mold, said reaction mixture comprising:(a) a polyisocyanate component consisting of at least one polyisocyanate in which all the isocyanate groups are aromatically bound,(b) compounds having molecular weights of from 400 to 12,000 and having at least two isocyanate reactive hydrogen atoms,(c) water, in a quantity of at least 0.

Abstract: A first reaction mixture, prepared from (a) aromatic isocyanates with isocyanate contents of from 5 to 50%, and (b) compounds with molecular weights of from 32 to 10,000 which contain at least two isocyanate-reactive hydrogen atoms, in an equivalent ratio of component "a" to component "b" of 0.8:1 to 5:1, from 0.1 to 20% of a blowing agent and, optionally, other known additives, is introduced into a closed mold with a rigid cavity. After this mixture has become resistant to permeation, but is still compressible, a second reaction mixture, prepared from (c) aliphatic and/or cycloaliphatic polyisocyanates having isocyanate contents of from 5 to 50% and (d) compounds with molecular weights of from 32 to 10,000 which contain at least two isocyanate-reactive hydrogen atoms, in an equivalent ratio of component "c" to component "d" of from 0.

Abstract: A pneumatic tire comprising an encircling tread and two side members, wherein each side member comprises a side wall having a bead ring and part of the tread backing, characterized in that said tread backing has the following features:(a) the tread backing is formed as a ring which extends to the center of the tire and is intimately joined to the side wall on the other side;(b) bands whose length is substantially equal to the width of said ring are fixed on the circumference of said ring in the center of the tread;(c) the width of said bands is approximately equal to the distance between said bands;(d) there are recesses in the part of said ring facing the tread, into which said bands of the other side fit during assembly, so that said tread backing has a substantially flush surface after assembly; and(e) there are beads on the end of said bands for clamping in the tread.

Abstract: This invention relates to a pneumatic tire comprising a tread surface and two separate side parts of an elastomeric synthetic resin and optionally reinforcing elements, wherein the side part not only forms the side wall of the tire but extends from the rim wire to the mid-line of the tire and therefore also forms the foundation for the tread surface on one side, and to a process for the manufacture of such pneumatic tires.

Abstract: The invention is related to a method of assembling a segmented tire mold core from core segments inside a tire mold, a method of splitting up and removing a segmented tire mold core from a tire mold and an apparatus comprising a tool which determines the outer contour of a tire and a segmented tire mold core which determines the internal contour of a tire, as well as the associated charging, conveying and control devices.

Abstract: This invention relates to a process for the manufacture of a tire in segments in a closed mold wherein the internal surface of the mold determines the shape of the external surface of the tire segments, comprising:(a) radially moving from the center of a mold towards the internal surface of the mold a molding tool which determines the shape of the internal surface of the tire segments while leaving a space between said molding tool and said internal surface of said mold, said space conforming to the shape of said tire segments;(b) filling said space between said molding tool and said internal surface with a plastic compound; and when said plastic compound is solidified,(c) moving said mold or said molding tool in the circumferential direction so that the next segment follows immediately upon the segment already produced.

Abstract: A process is provided for introducing mixed foamable reactants to a mold. The process involves introducing the reactants into a mixing chamber through injection apertures in its side wall portion. The mixing chamber has an outlet aperture communicating with the cavity of the mold. Prior to introducing the reactants into the mixing chamber, a displacement piston having a smaller cross-section than the mixing chamber is inserted into the outlet aperture of the mixing chamber so that the injection apertures communicate with the mold cavity by means of a generally annular passage.

Abstract: The instant invention relates to a method and apparatus for measuring the proportion of undissolved gas in a liquid component for the production of foam materials, particularly those based on polyurethanes. The method is based on the equation of state of ideal gases (Boyle-Mariot Law: p.multidot.v = constant) at constant temperatures. The gaseous portion of a liquid component charged with gas increases its volume under expansion according to the above equation. The gas expansion also increases the liquid volume. The differences in the volumes, of the liquid at two differing pressures is therefore a measurement of the quantity of gas present in the liquid. The apparatus consists of a closed graduated measurement vessel being connected to a variable pressure means capable of producing at least two different defined pressures.

Abstract: This invention relates to an apparatus for dosing and mixing at least two fluid reactants consisting of a dosing unit; a mixing head and conduits connecting the dosing unit and mixing head; characterized in that the housing of the dosing unit and the mixing head together form a rigid block with the conduits connecting the dosing cylinder with the mixing chamber in the form of channels inside the block.

Abstract: An apparatus for mixing and molding a chemically foamable reaction mixture is comprised of a mold with a mixing chamber which has its outlet aperture in a wall of the mold and a displacement piston mounted in the opposite wall. An ejector piston is displaceable within the mix chamber and may be so channelled as to serve as a control piston. This ejector piston is displaceable from a position wherein the injection apertures lie between it and the mold cavity to a position wherein its end surface is flush with the mold wall. The displacement piston is so mounted that it may extend across the mold cavity and intrude into the outlet aperture of the mixing chamber. This displacement piston has a diameter smaller than the diameter of those portions of the mixing chamber into which it protrudes so that when this piston is within the mixing chamber an annular cavity is formed between it and the side walls of the mixing chamber. It is withdrawable to a position flush with the mold wall it protrudes through.

Abstract: A process for molding foam products substantially free from flaws caused by air bubbles in the foamable reaction mixture wherein a foamable reaction mixture having a viscosity .eta. in cP between 100 cP and 2500 cP is introduced into a mold cavity through an opening in the mold wall and against the wall of the cavity opposite the opening of a mold in which the thickness of the cavity and the thickness s of the resulting molded product adjacent to the opening at the time the mixture is introduced into the cavity is maintained at 0.5 mm to 15 mm under conditions whereby the radial distribution rate w.sub.radial in m/sec., .eta.

Abstract: Apparatus to practice the method of forming foam molded articles without the defects caused by incompletely mixed reactants in the mold cavity is provided. A mixing chamber bounded by a sidewall portion having injection apertures, an outlet aperture which communicates with the mold cavity and a first ejector piston displaceable within the bore of the mixing chamber is provided. Opposite said outlet aperture is a second ejector piston which is retracted at the start of the mold filling operation to provide a receiving chamber in the mold wall. As the mold filling proceeds, this piston is displaced towards the mold cavity until its end surface forms a planar surface with the mold wall. Optionally, this piston may be displaced into the mold cavity to eject the molded article.