Abstract: A perforated covering structure is described for hygienic-sanitary products, such as sanitary towels for women, comprising an upper layer constituted by a non-woven textile of fibers of hydrophobic material, an intermediate layer or core constituted by a film of hydrophobic material, and a lower layer also constituted by a non-woven textile of fibers of hydrophobic material. The covering structure is applied in direct contact with that face of the absorbent core of the product which is intended to face the body of the user in use.

Abstract: An optical information storage medium comprising a transparent substrate and an information carrying layer positioned on one side of the substrate, wherein the information carrying layer contains at least 30 per cent by volume of tin and at least 15 per cent by volume of cobalt oxide. The information carrying layer may be formed directly on one surface of the substrate.

Abstract: Improved binders or binding seals are proposed which have a substrate of a flexible material. At one end of the substrate is provided an ordinary adhesive layer and at the other end is provided a peelable adhesive layer covered with an ordinary adhesive layer. The peelable adhesive layer allows the user to stick the end of the binder and peel it whenever desired. The binder may be formed with a hole or holes at one end to secure it to a file, and with a peelable adhesive layer at the other end so that a document can be stuck and peeled on and from it.

Abstract: Readily peelable and sterilizable packages composed of two multi-layer sheets which are attached to one another by sealing in the zone regions and in which one sealing layer comprises an ethylene/1-butene copolymer and the other polypropylene or a propylene/ethylene copolymer.

Abstract: Optical recording media for recording and retrieval of information by means of high energy radiation, which media consist essentially of a polymeric base having uniaxial orientation and, applied on this, a metal film of high reflectivity having the orientation of the crystallites corresponding to the orientation of the base and retrieval of information are effected by means of high energy radiation.

Abstract: A fiber reinforced structure formed by layers of fiber having a metallic reinforcement element disposed therebetween. The metallic element includes bent portions or fingers formed at the edges thereof, which extend toward the outer surfaces of the layers of fiber. The fiber layers and metallic element are held in place by resin injected during a molding process. The bent portions of the metallic element bridge the inner plane surfaces of the layers of fiber to strengthen the areas at the resin plane where stress areas normally causes the layers of fiber to separate.

Abstract: A decorative surface covering and a method of and an apparatus for making the decorative surface covering. The decorative surface covering has a transparent or translucent layer. The transparent or translucent layer contains a platey material oriented at two or more different angles with respect to the surface of the layer to provide an enhanced three dimensional effect to the decorative surface covering.

Abstract: Disclosed is a protective patch for a biaxially heat shrinkable, thermoplastic vacuum bag for protecting the bag from puncture by sharp protruding bones in bone-in cuts of meat which are vacuum packaged within the bags. The patch is made from multi-layer film and comprises a layer of linear low density polyethylene and a layer of ethylene vinyl acetate copolymer. The patch is biaxially heat shrinkable and shrinks with the bag. A method of making the patch is also disclosed.

Abstract: A tubular article with circumferential projections having radial or chordal corrugations. The chords have tooth-like formations or are parallel and directed vertically in underground installation. In the last case, the sides of the tube can be devoid of the corrugations, or have them radially or tooth-like. Furthermore, the projections can be skewed and alternating in the opposite directions. Also, the projections can have offset planes. Finally, in case of two corrugations, they are diametrically opposed in a single chordal direction and are represented by rings bent parallel to the applicable load which is adverse with thus prestressed projections.

Abstract: A dielectric composition comprising an admixture of finely divided solids comprising (a) a noncrystallizable glass of which the deformation temperature (T.sub.d) is 580.degree.-625.degree. C. and the softening point (T.sub.s) is 630.degree.-700.degree. C., and (T.sub.s -T.sub.d) is 50.degree.-75.degree. C., and (b) a refractory which is substantially insoluble in the glass at temperatures of 825.degree.-900.degree. C.

Abstract: When pipes are provided with comparatively rigid linings, the gaps which tend to appear between the pipe and the lining along the length thereof, and through which gaps gaseous type contents tend to escape, are sealed by providing between the pipe and the lining radially expandable sealing rings spaced along the length of the pipe, those rings compressing when the lining is in place and only partially expanding if the lining tends to separate from the pipe, thereby to provide a series of annular seals along the length of the pipe. The sealing rings may be positioned within the pipe before the lining is applied or may be initially secured to the lining and moved into place with the lining.

Abstract: A fiber reinforced plastic composite wheel and method of making it is disclosed. The wheel includes a rim and a disc, with the disc comprising reinforcing fibers oriented predominantly in a radially outwardly extending direction. The rim, in the preferred construction, has a plurality of radially disposed and substantially distinct layers. The inner and outermost layers have fibers that extend essentially in the same direction, with one or more middle layers having fibers extending in an opposite direction. Preferably, the inner and outer layers have directional fibers extending essentially parallel to the wheel axes.

Abstract: A method of manufacturing finished articles of flexible plastic material includes formation of a sheet of plastic material with a first portion having a raised pattern on one surface thereof and at least partially curing the sheet. The first portion having the raised pattern is removed from the sheet and a second portion of plastic material having a raised pattern on one surface and of a color contrasting with that of the first portion is formed in that area of the sheet from which the first portion was removed. A plastic backing layer is formed on the sheet and the article thus formed is cured. The backing layer may be of a color contrasting with that of the second portion of plastic material, or the first portion may be allowed to remain and its back surface may be coated with a layer of plastic of a color contrasting with that of the first portion after which the backing layer is applied.

Abstract: A warp knitted lace fabric comprising a plurality of chain stitches and a ground insertion yarn, pattern yarn and/or other yarn interconnecting said chain stitches, said plurality of chain stitches being made either as a whole or in part by a heat bonding yarn comprising a lace knitting yarn carrying a low-melting thermoplastic synthetic resin covering and said heat bonding yarn being thermally jointed to itself or to other component yarns at intersections.

Abstract: A process for making an article having an irregular internal passage utilizes a hollow polymer preform. The preform is filled with a relatively incompressible filler material such as a powder or a fluid, which supports the preform when it is placed in a mold, e.g. an injection mold. The filler enables the preform to withstand high molding pressures and prevents deflection and movement of the internal passage within the preform. The shell, a layer of a polymer material is then molded about the preform. After the final article has been formed, consisting of the preform and shell, the filler is removed for possible reuse.

Abstract: The acoustical performance of automotive trim panels is improved, especially with respect to noise generated by structural vibration of an automobile and synchronous vibration of the trim panel itself, by positioning a dead, vibration-damping, foam material between the automobile frame and a semi-flexible support layer of the trim panel, the trim panel also including an open-celled, flexible, airborne sound-absorbing foam layer bonded to the opposing face of the support layer, and wherein the dead foam material has a substantially lower resilience value and a substantially higher recovery rate than the open-celled foam layer.

Abstract: A heat shrinkable closure is disclosed having a central section which has been hot stretched and cooled while in stretched condition sandwiched between a pair of unstretched end sections and in which one end section has a tapered grooved extension.

Abstract: An optical information recording medium comprises a plastic substrate and a recording layer containing an indole type polymethine compound wherein the substituents attached to N atoms in the indole and indolene rings must be different from each other. The compound provides high solubility in alcoholic solvents, high storage stability (light resistance, heat resistance, etc.) and the like.

Abstract: A block of dimethylterephthalate having a needle-like crystal structure. The block is easily cleavable, and has a reduced tendency to fuse to other blocks when subjected to bag-stacking pressure.

Abstract: A refractory sheathing (1) of incombustible, compressed, flat insulating bodies (8) made of mineral or ceramic fiber for thermally insulating pipes (10) in preheating furnaces fired from below in the steel industry is described. The insulating bodies (8) have an inner and, if desired, also an outer arc-shaped profile, they enclose the pipes (10) to be insulated totally or almost totally in circumferential direction, and they are secured at the pipe in close mutual abutment by at least two retainers which engage the ends of a plurality of adjacent insulating bodies (8) forming a stack of insulating bodies. The risk of separating from the pipe during the constant vibrations of the same is reduced and the space requirement for installation at the building site as well as the cost of mounting involved are scaled down by the line-up of a plurality of insulating bodies (8) on a plurality of spaced apart rods (11) to form a highly compressed insulating body stack.