Abstract: Method and device for the casting of concrete products either by means of a periodic method or by means of a continuous slide casting method. Into the product, one or several cavities are formed by means of a cavity mandrel (4). The mix is compacted by rotating the cavity mandrel (4) back and forth around its longitudinal axis.

Abstract: A method of manufacturing a ceramic body having continuous three-dimension through-out holes which can be preferably employed as a filter for filtration of non-metallic inclusions in a molten metal and as a porous plug for introducing a gaseous medium for floating up the non-metallic inclusions. An organic body having a three-dimensional construction is placed in a casting mold, a slip of a ceramic material is poured into the mold, and after drying, the molded body is baked to effect decomposition of the organic porous body. Thus the ceramic body is provided with through-out holes communicating with to each other three-dimensionally together with a high mechanical strength.

Abstract: A method and apparatus for making concrete pipe having substantially uniform density throughout the length of the pipe has a packerhead which is rotated and lifted within a mold, and a conveyor for feeding concrete into the mold. A combined conveyor speed and packerhead lift control operates in response to the amount of power used to rotate the packerhead to slow the speed of the conveyor to a desired speed and change the lift speed of the packerhead when the load on the motor for rotating the packerhead exceeds a selected upper load limit or falls below a selected lower load limit.

Abstract: A vertical foil-blowing die head having a rotatable die is fed by a distributor which communicates centrally with a fixed member, and has a substantially horizontal distributor passage portion extending outwardly beyond the central air ducts for the blowing and cooling air and a vertical portion communicating with the die at a single orifice offset from the center or axis.

Abstract: Method for the casting of hollow slabs out of concrete by slide-casting. Concrete mix is extruded onto a base (18) preferably by means of a conical screw spiral (2). Thereinafter the mix is compacted by moving a cavity mandrel (3) fitted after the screw sprial. The end of the cavity mandrel (3) is moved along a path of movement of desired shape. The final end of the mandrel may be attached to the machine by means of a ball joint.

Abstract: The present invention relates to a method of forming the primary core of a concrete pipe. A steel cylinder is disposed vertically on the base of the pipe forming machine. A conventional rotary packerhead having a diameter less than the inner diameter of the steel cylinder is lowered concentrically to the bottom thereof. Concrete is then introduced within the steel cylinder through the upper end thereof. The packerhead is rotated to force the concrete into the annular gap between the packerhead and the steel cylinder. As the primary core is formed, the packerhead is raised and rotated while concrete is introduced within the steel cylinder, thereby forming a primary core consisting of a steel cylinder having an inner lining of concrete. In an alternative embodiment, the steel cylinder is completely embedded within the concrete.

Abstract: A device and method for flash suppression in a molding with rotation system having a non-rotating mating surface capable of venting gases during the molding process while simultaneously suppressing flash. Flash is directed inwardly and away from the mating surface and contained between a mandrel and mandrel housing in a low pressure reservoir which is completely separate from the mating surface. A cooling fluid is utilized to carry away flash particles from the low pressure reservoir and thereby further prevent contamination of the mating surface.

Abstract: This invention relates to manufacturing a grooved cylindrical core by extrusion. The manufacturing device comprises a single rotating integral die that has a tapered rear portion and a grooved cylindrical front portion. The tapered portion surrounds a stationary central member and guides the material from a main extruder. The front portion has a bore including linear or helical channels. The sealing problems are obviated since the tapered portion and the grooved portion make up an integral die. This die further enables to produce a grooved core perfectly gauged. According to another aspect, the threads or stripes between core grooves are identified by means of auxiliary extruders feeding predetermined die channels with extrusion materials having different colours. This stripe identification is particularly used for a core constituting the central strand of an optical cable.

Abstract: A packerhead, a concrete pipe making machine having said packerhead, and a method of making concrete pipe are disclosed in which twist forces on the reinforcing wire cage of the pipe and concrete voids are eliminated by rotation of the longbottom and rollerhead portions of the packerhead in opposite directions. The peripheral speed of the system is also increased over conventional systems.

Abstract: Container bags for intravenous solution of one-piece, blow-molded construction typically have a fill port or tube and at least an administration port in one end of the container bag. A method, an apparatus and an article of manufacture are provided where a fill port or tube on a polyolefin or other plastic container bag is sealed into a dome shape where the solid wall, dome-shaped material closing the port or tube effects the seal. The method provides for sealing the open end of a thermoplastic tube or port by using respectively hot and cold dies. Resistance of the tube or port to forming a seal at adjoining interfaces is overcome by rotating at least one of the dies. Disruption and mixing of the plastic at the interface or closure line is accomplished, forming a substantially homogenous mass which seals the port opening.

Abstract: A soap-containing formulation capable of becoming transparent on working is subjected to shear between two mutually displaceable surfaces. A shear zone is formed in the formulation as the latter is entrained in the surfaces.

Abstract: The phases present in a shear sensitive soap-containing formulation are controlled and may be changed by passing the formulation through shear zones formed by mutually displaceable surfaces. The shear zones are formed within the formulation by entraining it in the surfaces during passage between the surfaces.

Abstract: The mush and/or lather properties of soap-containing material including free fatty acids can be improved by subjecting the material to working. The material is passed through the shear zone(s) formed between two mutually displaceable surfaces between which the material passes.

Abstract: Steel, cast iron, synthetic resin or concrete pipes are coated with a hydraulically setting mass, such as cement mortar or a mixture of cement, fibers, aggregates and optional additives, by entraining the mass before it has set from a storage container having two opposite walls moving at about the same speed, one of the container walls being formed by a portion of the circumferential wall of the pipe being rotated about its longitudinal axis and the opposite container wall being formed by a tensioned carrier band having one end affixed to the rotating pipe and the mass with the covering tensioned carrier band being wound around the rotating pipe.

Abstract: A tubular article having a peripheral groove is formed by providing the groove in the wall of a tubular blank made of thermoplastic material such as polyethylene terrephthlate groove by applying simultaneously a pressure against the wall of the blank and axial stretching forces. In the bottom of the groove the material is drawn to yielding and the blank is simultaneously elongated.

Abstract: This relates to a die assembly for extruding tubular casing films wherein there are counter-rotating die members. One of the die members is mounted for shifting relative to its base under the influence of hydrodynamic pressures of the flowing extrudate so as to be self-centering relative to the other die member. This provides for a high shear cylindrical area leading into the die orifice which is of uniform thickness and which will provide for uniform fiber orientation due to the zero runout of the rotating dies.

Abstract: An apparatus (10) and method for fabricating tubes (26) from powders (32). A retractable, rotating mandrel (18) is disposed within a powder hopper (12) and circumscribed by a plurality of swaging dies (20). A flexible iris (14), disposed between the hopper (12) and the dies (20), reduces powder (32) loss.As the mandrel (18) is withdrawn from the hopper (12), the dies (20) alternatingly expand and contract compacting the powder (32) in a compaction zone (48) about the mandrel (18) to form a tube (26). The resultant continuous tube (26) is withdrawn along with the mandrel (18).

Abstract: A multi-layer laminate is formed by coextruding plural polymer layers in face-to-face contact with tooth-like interconnections at the layer interface.

Abstract: An apparatus for modifying the between the ribs space in a thermal plastic battery container is disclosed. The apparatus comprises a heated non-circular wiping member which when rotated about a fixed centerline defines a first circumference having a diameter substantially equal in length to the minimum between the ribs space and a second concentric circumference having a diameter greater in length than the first diameter.

Abstract: A high-strength laminate comprising generally weakly adhered biaxially oriented films, each formed of a blend which exhibits a distinct fibrous morphology with the fibres forming a distinct unidirectional grain when measured on a macro-scale but with the fibre-portions strongly deflected from this direction as seen on a micro-scale, the films being arranged in the laminate such that the unidirectional grain in at least two of the films criss-cross each other. This laminate is produced by melt attenuating the blend(s) while extruding the latter to films, cross-laminating the layers before or after solidification while they are still in molecularly unoriented state--except for the weak orientation produced by the melt-attenuation--and finally strongly biaxially orienting the laminate by stretching in several steps, whereby the stretching is generally uniaxial during each step.

Abstract: This invention relates to an apparatus and a process for forming building blocks by consolidating a mixture of cement and fibrous material. The process involves placing a charge of the mixture into a mold, compressing the mixture within the mold, inserting rotors into the mixture within the mold to consolidate and displace the mixture while forming hollow cores through the formed block, and removing the rotors from the formed block and the block from the mold. The apparatus includes a mold, a mold cover, means that apply pressure to the mold cover to compress the material placed within the mold rotors, means for spinning the rotors as they are lowered into and raised from the mixture by raising and lowering means. The block is formed on a removable pallet resting on lips within the mold. The pallet defines apertures substantially aligned with the rotors; the apertures allow for release of pressure when the rotors are withdrawn from the formed block.

Abstract: A concrete product making machine having a counter rotating packerhead assembly and a concrete supply control operable to maintain a desired amount of concrete in the mold above the packerhead assembly. The counter rotating packerhead assembly has a lower packerhead unit rotated in one direction by a motor and on upper packerhead unit rotated in an opposite direction by hydraulic motors mounted on the cross head of the machine. The upper packerhead unit located above the lower packerhead unit has a plurality of rollers and an annular trowel. The trowel has radially adjustable shoes which meter the flow of concrete to the lower packerhead unit. A control system responsive to hydraulic fluid pressure supplied to the hydraulic motors controls the operation of a concrete supply conveyor operable to deliver concrete to the chamber above the packerhead assembly. The control system includes a control valve assembly operable to regulate the supply of hydraulic fluid to a hydraulic motor operating the conveyor.

Abstract: A process and apparatus for putting a lip on a thick-walled tube of flexible material such as polyethylene comprises a cold rolling of the thick-walled tube with as little friction as possible on the wall of the tube. This is effected by vertically mounted rollers where the axis thereof is in substantial alignment with the axis of the tube being flared. At least one of the mandrels is rotated, and at least one of the mandrels is mounted for vertical movement and for putting pressure upon the wall of the tube during the rolling.

Abstract: A method and apparatus are disclosed for forming blown thermoplastic articles in which an extrusion head extrudes an essentially tubular parison of thermoplastic material. Sections of a preform mold are then closed around the parison, the sections having a preform cavity with a configuration such that one end of the parison is open after closing and the other end is enclosed. A core pin is next inserted into the open end of the parison and is utilized to compression mold the parison to form a preform. Heat is transferred from the parison through the inner and outer walls of the preform between the mold cavity and core pin during the compression molding step in order to thermally condition the preform and being the temperature within the desired range. The sections of the preform mold are then opened and the preform is enclosed within sections of blow molds within a blow mold cavity. The preform is next expanded to the shape of the blow mold cavity.

Abstract: Apparatus for producing tubular sheet material by extruding a fluid polymer material through a hollow centered die having an annular extending continuous or discontinuous extrusion orifice exit rotated about the die axis to discharge therefrom a continuous or discontinuous annular-form polymer structure which is collected on a generally cylindrical supported surface advancing through the hollow center of said die. The collected structure undergoes attenuation at an angle to the general extrusion direction because of the die exit rotation and consequently, has a grain therein extending at a significant angle, e.g. helically, to the general extrusion direction. The collecting surface may be formed separately from the support, e.g. by one or more endless belts passing either longitudinally or helical around the support so as to collectively define a cylindrical surface in the collection zone or combined with the support, e.g.

Abstract: Bottles made of saturated polyester resin, particularly polyethylene terephthalate resin, by orientation blow molding exhibit phenomenal properties and characteristics, but suffer from a serious disadvantage in that the bottle neck is greatly inferior in the properties and characteristics to the bottle body, because the neck is molded into the final form without undergoing biaxial orientation. Biaxial orientation gives the bottle body outstanding properties and performance because it causes the molecules of a molding resin material to be arranged in the same direction. Based on this principle, the bottle neck is given the same effect as is produced with biaxial orientation by applying tensile force in a certain direction to the molecules of a molding resin material while it is still in a temperature range at which orientation takes place.

Abstract: The present invention is concerning a manufacturing process of an object made of plastic material in a mould comprising especially a die and a punch, this process being particularly interesting in that the obtained preforms may be formed by every known method, including thermoforming, blowing, etc. The process according to the invention is characterized in that a quantity of plastics material is introduced into the cavity of the mould, in that the flow of the material is controlled while it is being introduced into the mould cavity, by displacing at least part of the punch relatively to the die, in that the punch is subjected to a restraining action while the material is being introduced, and in that the cavity is closed and the plastics material contained therein is then compressed by displacing at least part of the punch in relation to the die.

Abstract: A rotationally molded hollow article and a process for molding such an article, wherein the article is formed of a mixture of plastic pellets and powder both of which are copolymers of ethylene and vinyl acetate, having a predetermined range of pellet to powder mixture ratio, and with such mixture having a predetermined melt index range, the article being characterized by having substantial "bounce" characteristics generally equivalent to those possessed by hollow, non-cellular articles made of known thermoplastic compositions or known rubber-like compositions of natural and/or synthetic polymers, as well as those possessed by solid cellular articles made from other known thermoplastics or from known rubber-like compositions of natural or synthetic polymers.

Abstract: This application relates to a paste extrusion process using a ram type extruder wherein at least one, preferably both, of the die and mandrel of the extruder are rotated, in opposite directions when both are rotated. In preferred embodiments, the material being extruded is polytetrafluoroethylene, the mandrel has a smooth surface and the end portion of the die is heated.

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 method for manufacturing blown articles is disclosed wherein the article is manufactured from a parison having a high degree of multi-axial orientation. The method permits molecular orientation within the parison to be superposed with orientation imparted during the blowing step, whereby a blown article of greatly improved properties is manufactured.

Abstract: A laminated product such as a tire is cast from chemically extending liquids which form a laminated solid in a mold. The mold cavity is closed in preparation for use except for casting fluid inlet ports and exhaust vents. The mold cavity defines the shape of the product to be cast. Two or more chemically extendable liquids are injected into the mold without mixing through the inlet ports. Each liquid is injected through a different port. After injection, the liquids are arranged in alternate circumferential segments within the annular space. At least one of the inner and outer surfaces which define the mold cavity is then rotated about the common axis to impart a spiral configuration to each of the injcted liquids. The liquids are then allowed to chemically extend to solids and form a laminated product such as a tire.

Abstract: Method of reinforcing concrete pipe in a rotary molding method using a wire reinforcing cage having a helical strand disposed about its exterior to resist torsional forces on the cage during molding, the cage being formed from a flat sheet.

Abstract: Method and apparatus for producing glass fibre reinforced plastic pipes and the like wherein a rotatable hollow mould form is provided, an elongated roll of reinforcing fibres is located on holding means which are placed in the concavity of the mould, spaced from the sides of the mould, the mould is rotated and the fibre roll is unrolled onto the mould face to deposit fibres thereon and settable synthetic resinous material is introduced into the mould form. The holding means may be adapted to move the roll of reinforcing fibres from a position wherein it is spaced from the mould surface to a position wherein it is in contact therewith and the holding means may be rotatable with the leading edge of the roll secured until the roll has attained a suitable speed.

Abstract: Extruder with blow head comprising a cylindrical body containing at least one rotating screw in coaxial position, a feeding device for the thermoplastic material near one end of the cylinder and a blow head comprising a housing and a mandrel at the other end of the cylinder forming a slit tapering in the direction of flow of the plasticized material and through which said material issues, the screw and the blow head being arranged in one plane, and directly behind the blow head a cooling device for cooling the extruded tube, whereinA. the screw and the mandrel are rigidly connected with each other without any distortion being possible,B. the lip of the housing of the blow head protrudes from 0.1 to 10 mm over the lip of the mandrel,C. the diameter of the slit formed by the housing and the mandrel is in the range of from 1 to 20 mm in the most narrow area, andD.

Abstract: A method of fabricating molded articles composed of elastomeric material having embedded therein essentially oriented fibers, comprising the steps of fabricating a molded article with oriented fibers therein, positioning the molded article within a mold having two portions, a first mold portion defining the shape of the final molded article and a second mold portion arranged separately of said first mold portion and in communication therewith, said molded article being positioned partly in said first mold portion and partly in said second mold portion, subjecting the part of the molded article positioned in said second mold portion to a directed flow operation into said first mold portion and reorienting by said directed flow operation the fibers subjected to flow into a second fiber orientation direction differing from the fiber orientation direction of the part of said molded article positioned in said first mold portion.

Abstract: A cementitious conduit is formed in situ in a ditch or the like by defining an elongated volume of annular cross-section within the ditch with the axis of elongation of the annular volume extending along the ditch and with one end of the annular volume closed and the other end thereof open. A solidifiable cementitious material is introduced into the annular volume at the closed end thereof and such cementitious material is continuously urged to move toward the open end thereof at a rate at least equal to a given rate. Simultaneously, the volume is moved along the ditch at such given rate with the closed end thereof preceding the open end thereof and circumferential frictional forces are applied to the cementitious material at the inner surface of such annular volume.

Abstract: Methods of centrifugally molding a resin pipe or molding a layered composite pipe utilizing a rotating inner member are disclosed. The rotating inner member rotates at a speed higher than the centrifugally rotating mold and is movable towards and away from the mold surface. Movement toward the mold compresses the molding material between the rotating inner member and the centrifugally rotating mold. Movement away from the mold permits any material adhering to the inner member to be cleaned from said inner member due to the centrifugal speed of said inner member.

Abstract: The invention relates to a method for providing a thermoplastic pipe with an inner groove, by subjecting a heat plasticized pipe to the action of some rotatably supported deforming rollers which are expanded and rotated by means of a mandril. A relative rotating motion between said deforming rollers and the pipe is maintained until the pipe is no longer permanently deformable and the relatieve rotating motion is maintained to strengthen the walls of said groove.

Abstract: A method for producing extruded blown laminated film, wherein a plurality of layers of a molten thermplastic material are rotated about a common axis and combined during continuing rotation to form said film.

Abstract: This invention relates to a method of making a blown plastic container having a concave pressure bottom configuration by blowing a pre-form into a container having a flat bottom, then contacting and deforming the flat bottom to reform the flat bottom into the desired pressure bottom configuration. The flat bottom is reformed by blowing, or by mechanical contact, or both blowing and contact, at a temperature conducive to multi-axial orientation to provide a pressure bottom of increased strength. To facilitate the performance of the method utilizing an initial parison formed by free extrusion, the present invention further contemplates smoothing out any pinch flash and distributing it on the bottom of the parison, so that the pinch flash will not interfere with subsequent forming of the bottom of the final container as above described.

Abstract: A wire reinforced hollow core concrete fence post is made by injecting concrete into a form in which is centrally supported a longitudinally extending mandrel having a plurality of radially extending spacers extending longitudinally along its surface, the spacers being adapted to support a cylindrical tube of wire mesh reinforcing remote from the surface of the mandrel. A pallet board is disposed in the bottom of the form for supporting the concrete injected therein. Means are provided to rotate the manadrel and the tube of wire mesh reinforcing while the concrete is being injected into the form. Means are also provided to withdraw the mandrel from the form after the concrete has been injected, while retaining the concrete and the reinforcing within the form.