Abstract: A device for controlling the thickness of a sheet in calendering includes a thickness measuring unit for measuring the thickness of the sheet immediately after it has been formed by a pair of calender rolls, and a roll adjusting unit for moving at least one of the pair of calender rolls toward and away from the other calender roll. The device further includes a detection unit for detecting change in distance between the axes of the pair of calender rolls, and a control device for comparing the measured thickness of the sheet with a target thickness to obtain a difference therebetween. The control device then calculates a gap adjusting value on the basis of the difference, and compares the change in distance between the axes of the rolls detected by the detection unit with the calculated gap adjusting value. When these values become equal, the control device stops the movement of the one calender roll to make the thickness of the sheet equal to the target thickness.

Abstract: An apparatus for forming pellets in which a medium to be pelletized is delivered to a distribution box, the distribution box intermittently expelling discrete portions of the medium outwardly to form droplets. A conveyor moves the droplets away from the distribution box, the droplets solidifying into pellets as they travel along the conveyor.

Abstract: The invention concerns a cooling plug for sizing the interior surface of thermoplastic extruded pipe. Vacuum and/or pneumatic pressure is applied at the surface of the plug. The pneumatic pressure may cause the inner wall to balloon outwardly to form bells within a mold or within an outer wall, to fit into corrugations of an outer corrugated tube, etc. The vacuum may be used to pull the inner wall back to the surface of the plug after application of pneumatic pressure.

Abstract: A process for producing a molded product of propylene resin which includes melting and kneading at least a part of the following component (a), adding to the resulting melt the following component (b) or the component (b) and the remainder of the component (a) and kneading the resulting mixture to prepare a resin composition having a melt flow rate of 1 to 100 g/10 min, and then molding the resin composition into a molded product in which the breakage rate of the component (b) is 30% by weight or less: (a) 100 parts by weight of a crystalline propylene polymer having a melt flow rate of 1 to 300 g/10 min and (b) 3 to 80 parts by weight of a filler in the form of hollow particles having a mean particle density (true density) of 0.1 to 0.9 g/cm.sup.3, as measured according to ASTM-D2840, a mean particle diameter of 7 to 100 .mu.m and a 10%-by-weight breakage pressure resistance of 100 kg/cm.sup.2 or more, as measured according to ASTM-D3102.

Abstract: A method for improving the internal surface of a gas-barrier, when required heat-shrinkable, multi-layer plastics film laminate in the form of a seamless tube having the innermost layer of olefin resin, the method including applying corona discharge employing at least two pairs of electrodes to the innermost layer from the outside of the tube having a gas sealed therein and pressed to a flat state avoiding the contact of opposed surface areas of innermost olefin resin layer with each other, the two pairs of electrodes being arranged such that one electrode of each pair is in contact with the outermost layer of the tube and the other of the same pair out of contact therewith while one electrode of one pair is kept in contact with the outermost layer of the tube with which one electrode of another pair is kept out of contact on the same side of the tube, so that the wetting tension of the innermost layer surface is increased to at least 35 dyne/cm by the corona discharge treatment.

Abstract: A method and an apparatus for monitoring injection pressure, using the relationship between positions of a screw (1), filling of resin in a cavity and injection pressure. Mold cavity data are stored, whereby a display screen (2) displays, based on said data, a configuration of the cavity and straight lines corresponding to cross sections along which the cavity is divided into a plurality of regions. Screw positions required to sequentially fill the divided regions of the cavity with the resin are obtained to be displayed on a coordinate axis representing a screw position in a pressure waveform graph (22). Then an operator changes the setting of molding conditions referring to the data on the display screen, and carries out the injection to obtain the pressure data corresponding to the screw position to be displayed on the pressure waveform graph (22).

Abstract: An improved tire section repair unit for the repair of a damaged section of a tire. The repair unit includes two curved side walls pivotally connected to the base of the unit. A locking arm is provided that securely encloses the entire system of curved walls, base and internal air bag and heat pad arrangement situated about the tire under repair. The pivotable side wall design permits the repair of tires of varying sizes. A locking arm arrangement permits the use of lightweight side walls to enclose the system. As a result, the repair unit of the present invention is more transportable and less cumbersome to use.

Abstract: An embossed plastic film is made ultra soft and cloth-like by providing a plurality of post-embossed stretched areas along lines that are spaced uniformly across its width and length. The stretched areas are thinner than the unstretched areas. Films also have unique textures and offer cloth-like or non-woven appearances.

Abstract: This invention is a process for the production of a continuous running length of a thermosetting polymer by a continuously extruding a continuous running length of a sheath of a film forming fiber from a die to form a hollow object; b) continuously injecting the monomer of the thermosetting polymer into the hollow of the sheath at or immediately below the plane of the die opening; c) stretching the sheath containing the monomer; and d) polymerizing the monomer to make the continuous running length of fiber of thermosetting polymer.

Abstract: Articles (other than fiber) made from polybenzazole dopes can quickly be washed to remove polyphosphoric acid by a combination of initially washing with an acidic liquid and second washing with a hot leaching fluid at at least about 60.degree. C. The process can reach acceptable residual phosphorous levels (1500-2000 ppm) in as little as about 2 or 3 minutes.

Abstract: Coextrusion apparatus for forming tubular elastomeric ply made up of first, second and third concentric streams of elastomeric material and a pair of coaxial helical patterns of individual reinforcing elements wound in opposite direction with respect to each other contained within the first and third streams of elastomeric material and separated by the second stream of elastomeric material. A pair of reinforcing element guides are rotatably mounted within the apparatus between stationary flow channels for the three streams of elastomeric material, and are rotated in opposite directions with respect to each other. The two helical patterns of reinforcing elements and three streams of elastomeric material merge together substantially simultaneously in concentric circles which lie in a plane generally perpendicular to a central axis of the coextrusion apparatus to form the tubular ply. A method for producing such a reinforced tubular elastomeric ply also is presented.

Abstract: Films made from polybenzazole dopes can quickly be leached to remove polyphosphoric acid and other residual solvents by passing a leaching fluid such as steam through pores in the wet, never dried film. The process can reach acceptable residual phosphorous levels (1500-2000 ppm) in as little as about 2 or 3 minutes.

Abstract: A novel extrusion method and apparatus are disclosed for varying the width of an extruded article which employs the use of thermal pins in the extruder die body and does not involve the use of any mechanical manipulation of the die configuration.

Abstract: A method of manufacture of an ultra-high molecular weight polyethylene thin-wall pipe which is uniform in thickness and free from a folded mark. The ultra-high molecular weight polyethylene thin-wall pipe is manufactured by supplying ultra-high molecular weight polyethylene into and melting and kneading, continuously extruding the molten substance of the ultra-high molecular weight polyethylene from a die connected to a screw of the screw extruder to form a cylindrical roughly shaped article, and diametrically expanding the cylindrical roughly extruded article by means of a tapered core and taking up.

Abstract: Apparatus and method for treating the interior surfaces of hollow plastic objects to improve their adherency to and compatibility with another component, such as polyurethane foam. The invention consists of creating a vacuum in the object and drawing a conductive gas inside the object. A pair of electrodes are spaced apart from each other, and a source of electricity is provided thereto of sufficient intensity to produce an electrical discharge across the gap between the electrodes when an object is in the gap between the electrodes. The electrodes are arranged with regard to the size and configuration of the object to provide ionization of the conductive gas inside the object to surface treat the inner walls.

Abstract: A method is indicated of recycling plastic sheet material coated with adhesive and available in chopped form. The method provides for separating the plastic from the adhesive. In a first method step the chopped sheet material (4) is introduced into a solvent bath (1) where the chopped sheet material (4) is moved for a predetermined dispersing time under mechanical action. The mechanical action preferably is exercized by rolling or kneading. In a second method step, the adhesive dispersed in the solvent is separated from the chopped sheet material (4) by mechanical action of forces--preferably by introducing squeezing forces in a conveyor screw.

Abstract: The present invention provides a process for producing molded articles of a polyimide precursor by a use of a usual extrusion technique, and physical properties of polyimide products prepared by the heat treatment of the molded articles of the polyimide precursor at 400.degree. C. are excellent. This process is characterized by drying a solid obtained by pouring a dilute solution of a polyimide precursor including an aromatic tetracarboxylic acid component and an aromatic diamine component 1 into a liquid in which the precursor is only poorly soluble to obtain a dry solid having a polyimide precursor concentration of 50-70% by weight, and then extruding this dry solid at 80.degree.-130.degree. C.

Abstract: After loading a green tire in a tire vulcanizing machine and before shaping, bead portions of the green tires are centered relative to bead rings of upper and lower metal molds and are sequentially inserted into the bead rings precisely in parallel thereto by the same extendable/retractable sectors and chucks which are movable vertically. An apparatus preferable for practicing the aforementioned method includes a plurality of such sectors for centering and holding a bead portion of the green tire, slide and linkage mechanisms for extending and retracting chucks to which the sectors are mounted, and a cylinder mechanism for vertically moving the chucks so as to insert the bead portion of the green tire centered and held by the sectors into a bead ring of a tire metal mold.

Abstract: A rigidized fiber filter element is produced from a precursor fiber web. The precursor fiber web contains heat-shrinkable fibers or binder fibers or both. The web is exposed to temperatures sufficiently elevated to cause shrinkage of the fibers or melting of the binder. After cooling the web, the filter elements produced are self-supporting, and may have densities up to 500 kg/m.sup.3 to improve filtration while retaining good functional characteristics for operating pressure drop and air permeability. Rigidized fiber filter elements can be constructed of one material, and thus may be suitable for recycling.

Abstract: A lenticule is bonded to the eye as part of its formation process by curing or final curing the lenticule on the eye. Such lenticules provide a smooth transition from the body of the lenticule to Bowman's layer on which the lenticule is disposed. The lenticule at the time its material or precursor is placed on the eye may vary from being essentially all viscous collagen which flows and must be molded to obtain a desired lenticule configuration to a substantially stable preform which holds its own shape. Such preformed lenticules may be formed using an appropriate mold and photopolymerization or other partial curing techniques to pre-cure the lenticule material to an appropriate stage for application to the eye.