Abstract: A polymeric composition particularly suitable for obtaining heat sealable soft polypropylene fibers comprises a propylene homopolymer modified with a propylene homopolymer having an isotacticity index higher than 80, an ethylene-propylene copolymer insoluble in xylene at 23.degree. C. and a propylene copolymer soluble in xylene at 23.degree. C.

Abstract: A polymeric composition particularly suitable for obtaining heat sealable soft polypropylene fibers comprises a propylene homopolymer modified with a propylene homopolymer having an isotacticity index higher than 80, an ethylene-propylene copolymer insoluble in xylene at 23.degree. C. and a propylene copolymer soluble in xylene at 23.degree. C.

Abstract: Reticular structures comprising one or more fibrillated films perpendicularly arranged between two or more fibrillated films are prepared by a process comprising the steps of: feeding one or more fibrillated films onto a conveyor; feeding one or more transversal films perpendicularly to the conveyor feed direction; cutting such transversal films in position corresponding to the edges of the base film or films; suporposing to said transversal films one or more fibrillated films fed parallelly to the conveyor feed direction and causing the cohesion of the resulting composite structure.The device for producing such reticular structures is described too.

Abstract: Reticular structures comprising one or more fibrillated films perpendicularly arranged between two or more fibrillated films are prepared by a process comprising the steps of: feeding one or more fibrillated films onto a conveyor; feeding one or more transversal films perpendicularly to the conveyor feed direction; cutting such transversal films in position corresponding to the edges of the base film or films; suporposing to said transversal films one or more fibrillated films fed parallelly to the conveyor feed direction and causing the cohesion of the resulting composite structure.The device for producing such reticular structures is described too.

Abstract: Polyolefinic films having improved impermeability characteristics to gases and vapors, said films being coated on either one or both its surfaces by a layer of a copolymer containing functional hydroxylic groups, functional acid carboxylic groups and optionally--esteric groups and obtained by hydrolysis of copolymers consisting of an unsaturated ester and of an unsaturated acid or corresponding anhydride.

Abstract: Device for the continuous manufacture of manufactured articles reinforced with mixtures of hydraulic binders and consisting of:a conveyor belt;a plurality `A` of process stations for the formation of superimposed thin and uniform layers of a net of a hydraulic binder mix, each station consisting of:a feeder of the reinforced net 4;a wetting and degassing device 5 of the net 4;a means 2 for metering the binders mix;a section 7 for feeding and laying the net 4 on the conveyor belt 1;compacting elements 16;a means 6 for the extraction of water during the compacting state; anda second metering device 2' for the hydraulic binders mix;a levelling and sizing station 23;a final water-extracting station 26;a pressing station 27;a longitudinal and cross-cutting station 35, and a gathering station 36 for the produced plates.

Abstract: There are disclosed coupled packaging sheets which are impermeable to gases and vapors and consist of two polyolefinic films coupled together, at least one being an oriented polypropylene film and at least one of the two films being coated with a lacquer which acts as a barrier to gases and vapors, and which is metallized on the face in contact with the other film.The present invention provides coupled sheets or films based on films of olefinic polymers, showing improved characteristics of impermeability to gases and vapors and which are particularly suited for the manufacture of containers, envelopes, bags, vessels and, in general, manufactured articles intended prevailingly for the packaging industry.

Abstract: Process for the netlike opening of fibrilled polymeric films, said process consisting in conveying to an opening device of the conventional type (based, for instance, on diverging transferring elements and on lateral film pulling elements such as clamps, grippers or pins, which engage the film at its edges and which are fixed on said traverse elements) the fibrilled film of an undulated or corrugated shape, with the front of the corrugations or waves perpendicular to the direction of the transferring motion, so that the length of the film between the lateral consecutive pulling elements be in excess with respect to the distance between said elements, wherefore said excess will compensate the longitudinal shrinkage that the film will suffer during the transversal opening.

Abstract: Composite film for packing comprising an inner supporting layer of a polyolefinic film coated, on one or both faces hereof, with a polyolefin containing free carboxylic acid along the polymeric chain and with a vinyl polymer or with a polyamide.

Abstract: Fibrillated films or flat netlike structures made of synthetic polymers and having a specific surface area of more than 12 m.sup.2 /g. the thickness thereof in microns are disclosed, as is use of said films or flat netlike structures as reinforcement for hydrosetting binders such as cement. A method of preparing the fibrillated films or flat netlike structures is also disclosed.

Abstract: A process is provided for continuously manufacturing plates containing an open net fibrillated polymeric film reinforcement. A net having a plurality of fibrillated polymeric film layers is unwound from a continuous reel, and the net is cut into pieces having a length approximately equal to a circumference of a forming roll for forming a plate to be manufactured. The net pieces are impregnated with a cement mix and then deposited onto a conveyor belt on which a cement mix layer has been previously deposited. After contacting the net with the cement layer, the net is subjected to vibration. A vacuum is applied to the net contacting the cement layer to remove excess water and to increase the compactness between the net and the cement layer.

Abstract: Films comprising alpha-olefin polymers, such as polypropylene consisting essentially of recurring propylene units and having a substantial crystalline polypropylene content, and in particular isotactic polypropylene, are rendered poorly adhesive to the welding bars of automatic and semi-automatic machines conventionally used for the manufacture of containers, envelopes, bags, vessels and, in general, other manufactured articles useful in the packaging industry, by coating the films by a mixture of a copolymer of a vinyl ester with an unsaturated acid, a terpolymer of an alkyl acrylate, an alkyl-methacrylate and an unsaturated acid and a cross-linking amine.

Abstract: A circular loom is disclosed for the manufacture of tubular fabrics made of threads and/or strips of polymeric materials.

Abstract: There are disclosed a process for the continuous production of open, composite reticulated structures consisting of at least two superimposed or overlapping fibrilled films of synthetic polymers, and apparatus for effecting the transversal opening or stretching (with respect to the slitting or fibrilling direction) of a fibrilled film or of a combination of at least two superimposed fibrilled films and which comprises a feeding system for the fibrilled film, a pair of diverging guides each closing upon itself in the form of a ring for transverse stretching of the film, a series of clamps sliding on guides for gripping the edges of the film or film assembly, means for feeding the clamps to the guides, a series of two pulling means for engaging the clamps, means for opening the clamps and dragging them along the guides to the feeding devices, and means for take-up of the open film or the assembly of open films.

Abstract: A bonded sheet for packaging is disclosed having a thickness of from 20 to 200 microns and comprising two films, one of which is obtained from chlorovinyl polymers and the other from olefinic polymers, and characterized in that one of the two films has, on its surface in contact with the other film, a metalized coating with a resistivity of from 1 to 5 Ohms. The chlorovinyl polymer film is a film, optionally stretched, prepared from polymers or copolymers of vinyl chloride, having a Fikentscher value K of from 40 to 80. The polyolefinic film is a film, optionally oriented by stretching, prepared from a polymer selected from the class consisting of a polyethylene with a melt index of from 0.5 to 15, a polypropylene with a melt index of from 1 to 20, a crystalline propylene/ethylene copolymer containing from 0.1 to 15% by weight of ethylene and with a melt index of from 1 to 20, or mixtures thereof.

Abstract: A circular loom is disclosed for tubular fabric consisting essentially of strips of synthetic, artificial and natural substances, said loom being of the vertical heald type with healds arranged on concentric rings, with the drawing and the winding up of the fabric being formed on a fabric gauging cylinder arranged downstream of the shuttles, characterized in that said loom comprises one single rotary positive cam with a double track for the control of the alternate motion of the healds, said cam consisting essentially of a hollow cylinder turning coaxially inside the fabric-gauging cylinder and on whose outside cylindrical surface there are provided two closed track guide cams having a substantially helicoidal development, of which one is the cam controlling the motion of the external healds, while the other controls the internal healds, those guiding cams being associated with guide-pads or cam followers which are integral with saddles carrying the healds mounted slidably in fixed vertical guides, thereby im

Abstract: Films consisting essentially of alpha-olefin polymers, such as normally solid polypropylene consisting essentially of recurring propylene units and having a substantial crystalline polypropylene content, and in particular isotactic polypropylene, are coated with a ketonic resin resulting from the polycondensation of aldehydes with ketones, which coating renders the films readily thermoweldable and/or impervious to gases, vapors and the like. The coated films are useful for the manufacture of containers, covers, small bags, vessels and in general for the manufacture of articles useful in the packaging industry.

Abstract: Films comprising alpha-olefin polymers, such as normally solid polypropylene consisting essentially of recurring propylene units and having a substantial crystalline polypropylene content, and in particular isotactic polypropylene, are rendered easily thermoweldable and/or impervious to gases and vapors, and also given improved resistance to sticking against the welding bars of automatic and semi-automatic machines conventionally used for the manufacture of containers, envelops, bags, vessels and, in general, other manufactured articles useful in the packaging industry, by coating the films with a first layer comprising a polyalkyleneimine and a second layer comprising a mixture of an epoxy resin, an acrylic or methacrylic polymer or copolymer, and nitrocellulose.

Abstract: There is disclosed a bonded sheet for packaging, having a thickness ranging from 20 to 200 microns, a low transmittance, a low permeability to gases and vapors, a high resistance to perforation, and high anti-static characteristics, said bonded sheet consisting essentially of two films prepared from substantially crystalline polyolefin polymers or mixtures thereof and, optionally, from an interposed adhesive layer, wherein at least one of the two films is a film oriented by the stretching of polypropylene essentially constituted by isotactic macromolecules and having a melt index between 0.5 and 5, and wherein at least one of the two films is coated, on the surface thereof which is in contact with the other film, with a metallized layer (preferably aluminum) having a resistivity between 1 and 5 Ohms. One of the two films may be a film, optionally oriented by stretching, prepared from a polymer selected from the class consisting of a polyethylene having a melt index of from 0.