Abstract: A two-ply, book-style album comprises an inside tray sheet (12) and an outside cover sheet (14). The sheets (12, 14) are preferably formed from high-density polyethylene, and are thermally heat sealed together via a peripheral seal (34) and spine rules (36). The spine rules are formed into the front or obverse surface of the inside tray sheet (12) to define living hinges. An apparatus (70) and method for automatically manufacturing the albums (10) is also disclosed.

Abstract: Apparatus for simultaneously severing and heat sealing of overlapping portions of thermoplastic sheets between a fixedly mounted anvil and a reciprocable heated blade has an uncooled hold down device with two metallic plate-like members which flank the blade and are confined in layers of silicone so that they are thermally insulated from the blade and need not come in direct contact with the thermoplastic material. Those portions of the silicone layers which contact the exposed side of the adjacent sheet opposite the anvil at the respective sides of the blade tend to stretch the sheets in a direction at right angles to the cutting plane to thus ensure immediate separation of the welded seams which are formed by the blade during severing of the sheets.

Abstract: A multi-ply fabric is assembled from a plurality of plies including at least a single thermoreactive ply and a single fibrous ply. The method of combining the plies incorporates a hot pin perforator to simultaneously perforate and bond the thermoreactive ply to the fibrous ply.The multi-ply material finds utility in absorptive products having a liquid impervious perforated surface acting as a facing or covering for the absorptive inner plies.

Abstract: A method and apparatus are disclosed for sticking ornamental pieces onto a web of material in which the web and a sticking head are positioned relative to each other so that each ornamental piece can be placed on the web by the sticking head at a predetermined position. The sticking head has a cutting edge for cutting each article before it is pressed against the web. An ornamental piece cut from a tape of material by the cutting edge and attached to the lower side of the sticking head is positioned and stuck onto the web so as to achieve a desired pattern on the web. The web and the sticking head are positioned relative to each other at each position to which an ornamental piece should be stuck in order to achieve the desired pattern on the web. Each ornamental piece may be cut out from a tape of material having a hot-melt layer, which is heated by an element opposite the sticking head when the piece is stuck onto the surface of the web.

Abstract: A disposable absorbent product such as a panty liner (or pantiliner) or sanitary napkin or product for incontinents having a resilient, scalloped perimetrical edge, and a method of making the product. In a preferred laminated embodiment, a resilient absorbent core lamina is disposed between and coextensive--at least in their edge areas--with a liquid permeable topsheet and a liquid barrier backsheet. The elements are bonded together by a multiplicity of perimetrically spaced, compacted bonded areas which impart a scalloped character to the edge of the product, and wherein each scallop is filled with an edge portion of the resilient absorbent core lamina. Each bonded area is preferably elongate, and orthogonally disposed with respect to the edge of the product; and, preferably, each bonded area comprises a plurality of concatenated discrete bonds for improved flexibility.

Abstract: A packaging for filling materials which are capable of flow, comprises side and end walls of coated paper, cardboard or the like, which are joined by means of at least one sealing seam. Bending lines (7) are provided in the coated paper, cardboard or the like. So that the bending lines in such packaging remain undamaged in spite of a thin overall coating of plastics material on the paper web, even when processed in a manufacturing machine, it is provided that disposed in the region of at least some bending lines (7) is at lesat one plastics reinforcing strip (15) which engages thereover, such that the welding and contact surface (29) between the reinforcing strip (15) and the coated cardboard (61, 62) terminates from all sides at a spacing from the bending lines (7).

Abstract: A stack of interlocked detachable bags, preferably formed from a thermoplastic foil strip, and each comprising two walls, a front wall and a back wall, preferably at least one handle-shaped incision positioned on one of said walls adjacent an upper filling opening, wherein the individual bags each have an interlock piece and are attached together with the aid of at least one interlock means engaging their interlock pieces, and by means of a row of perforations forming an edge of the interlock piece the individual bags are detachable from the interlocked stack by tearing off. On one of the walls of each bag adjacent an upper filling opening edge of that bag a reinforcing piece, preferably of plastic foil, with the interlock piece is attached so that the interlock piece protrudes above the filling opening edge. Advantageously the inside of the back wall is provided with the protruding interlock and reinforcing pieces.

Abstract: A tape having a series of surface-type fastener pieces is manufactured by intermittently feeding a surface-type fastener tape blank composed of a release sheet of paper and a surface-type fastener of synthetic resin attached by an adhesive layer to the release sheet and comprising a base strip and a plurality of fastening elements, and fusing the surface-type fastener in a predetermined pattern by ultrasonic or high-frequency welding to produce gaps which define a series of surface-type fastener pieces on the release sheet. The release sheet with the series of surface-type fastener pieces attached thereto by the adhesive layer is then separated from a scrap composed of a surface-type fastener web from which the surface-type fastener pieces have been blanked out. Each of the surface-type fastener pieces is fused along its peripheral edge to prevent the fastening elements thereon from unraveling.

Abstract: A longitudinally extending pad of a rubbery, compressible, water-absorbent material is covered with a knit fabric to provide an abrasive surface. A scraper is formed integrally at one end of the pad by applying heat and pressure to the one end to compress and harden the one end. Thus, the scraper, which comprises an elongated extension of the pad, is thin edged and relatively rigid.

Abstract: An improved apparatus for producing laminated articles such as vehicle seat inserts. A continuous web of foam riser material is intermittently advanced along the apparatus by chain drag conveyor means. Fabric cover panels are longitudinally spaced on the upper surface of the web and sewn thereto at an upstream sewing machine station. The conveyor means advances the web together with the panels to a platen press station wherein a press plate moves to insert cutting and heat sealing dies into engagement with the laminated material. A laminated insert pattern is cut from both the web and overlying cover and thereafter heat sealed around its outer perimeter by bonding means sandwiched between the panel and web. A photocell sensing arrangement is adapted to normally see-through the web such that it senses the trailing edge of each advancing panel.

Abstract: A device for servicing fabric that is composed primarily of man made fibers such as polyester. The device includes a heated cutting element and two channels that smooth and form the melted edges of the fabric to a desired contour and thickness.

Abstract: An apparatus for applying transverse welds on a plastic foil web in dependence on the print register is provided with a conveyor which is advanced by means of a control unit intermittently and synchronously with respect to a welding unit. The control unit includes a drive disk whose eccentric pin is adjustable and guided by an eccentric block. Via a coupling rod, the drive disk is connected to a rocker which is accommodated in a gear segment and whose oscillation is adjustable by a spindle. The gear segment cooperates with the conveyor via a clutch-brake unit which provides the intermittent advance of the conveyor by uncoupling from or connecting the latter with the gear segment and is controlled by a plurality of contactless switch elements. For precise adjustment of the advance of the conveyor, the spindle cooperates with a motor which operates in dependence on the print register as monitored by a photocell.

Abstract: A woven textile fabric having at least 65% thermoplastic fibers therein with an ultrasonically cut and sealed edge characterized by a wash durability of preferably at least 25 to 50 washings without significant raveling. Apparatus and processes are provided for effecting such ultrasonic cutting and sealing to produce the desired cut and sealed edge in the woven textile fabric.

Abstract: A method and apparatus for slit sealing thermoplastic materials, primarily linear low density polyethylene, either alone or with coextrusions of other materials. The material is passed over a presealing roll, and the area to be slit is presealed using heated air. Very quickly after the presealing, the material is slit with a heated knife blade, the slit edges being sealed by dragging along the sides of the heated blade. The cutting edge of the blade is angled to roll a bead upwardly on the material, and the slit edges are held taut and separated by an edge holding device.

Abstract: An arcuate shaped body fluid absorbent product is made by a process which employs the steps of delivering onto an arcuate shaped surface a composite comprising a layer of body facing cover material, a layer of absorbent core and a layer of garment facing cover material. The core, sandwiched between the two cover materials, is planar in the relaxed state. The cover materials are sealed together about the periphery of the core while the composite is deformed on the arcuate shaped surface to produce an arcuate shaped product.

Abstract: A binding machine for binding together a stack of individual bags to form a pad of bags by connecting the bags together at corresponding selvage portions adjacent the mouths of the bags, comprising a reciprocable side sealing means and, optionally, a reciprocable rear edge sealing means, a conveyor for the bags that is optionally movable either from front to rear of the machine or laterally of the machine, stop means for holding the stack of bags in a predetermined position for binding, and means for timing the reciprocable sealing means and the stop means to permit continuous but intermittant progression of a plurality of stacks of bags through the sealing cycle.

Abstract: This invention relates to a transverse sealing mechanism for use in producing bag-packed products by packing products in tubular film. The transverse sealing mechanism comprises compression-and-heat sealing means and compression-cooling and compression-cutting means disposed immediately below said sealing means, each of these means having a mechanism which can increase its compressive force infinitely. The packed bag transverse sealing mechanism provides for storing and perfect seals.

Abstract: Funnel material for bags and a method of making the same, wherein elongated sheet panels are disposed in face-to-face relation and secured along an intermediate longitudinally extended zig-zag joinder and separation line. This provides a pair of funnel strips each of which has a series of funnel pockets at its edge along the line. Bag body wall sheets attached to the panels are arranged to receive the funnel pockets of each strip in inwardly extending relation therebetween, for providing respective reversible funnels in bags into which the strips and bag wall sheets are adapted to be divided. The panels may carry separable fastener profiles adjacent their edges remote from the zig-zag line.

Abstract: Apparatus and method for heat sealing a selected segment of a web of at least two layers of biaxially oriented plastic film. The web layers are pressed together and a selected segment of the pressed web is heated above the bonding temperature of the plastic while adjacent web segments are maintained below that temperature. The surfaces pressing thus the heated web segment has a relatively lower surface friction than the surfaces pressing the adjacent web segment, whereby the layers of the heated segment of the web are physically unrestrained against shrinking during heating and are allowed to shrink back to their pre-oriented molecular configuration while the adjacent segment is restrained against movement. A hermetic bead seal is thus formed between the web layers. A product heat sealed according to the novel method is also disclosed.

Abstract: A method and apparatus for manufacturing a garment which is three dimensionally molded. The garment in the form of opposing sheets of fabric are fed from bolts of fabric to a molding station wherein a male mold section is provided in the shape of the three dimensional garment desired. A pair of opposing female mold sections close onto the male mold section sandwiching the sheets of fabric into the mold cavities. Heat is applied to mold the fabric sheets into the three dimensional garment. Simultaneously, an ultrasonic seamer cuts and bonds the periphery of the material around the mold. The mold cavity is then opened, portions of the mold are separated and the garment is then lifted off the male mold section.

Abstract: Gloves and other articles are manufactured from a pair of thermoplastic sheets which are drawn along a process line in adjacent, facing relation. A portion of one of the sheets is pushed outwardly to form an outwardly projecting loop, and a thumb-shaped line is formed between adjacent sides of the loop. The loop and adjacent portions of the thermoplastic sheets are then advanced to a finger and hand-forming station, where a thermobonded line of the shape of fingers and hand is formed between the thermoplastic sheets in registry with the thumb-shaped line, while retaining an open wrist portion. One may then cut away the resulting glove at the wrist portion.

Abstract: Adhesive bandages comprising a blister pad and adjacent adhesive-coated areas are prepared from heat-fusible bandage materials, preferably a nonwoven batt material, by applying the pad material to a base material and heat-welding around the perimeter of the pad to totally enclose the interior thereof. The portions of the base material extending from the pad area are compacted under heat and pressure to provide a surface suitable for a coating with adhesive. A medicated gel or other therapeutic material may be included within the confines of the pad area to provide a medicated blister bandage.

Abstract: The specification discloses an air-to-air, polymeric heat exchanger having a housing and a core removably mounted within the housing. The housing includes four generally identical duct units, which are secured to one another, and a top and a bottom, which are secured to the duct units. The core includes a pair of end walls and a plurality of tubes extending between, and opening through, the end walls. Each end wall includes a plurality of tubular projections or pockets extending from the end wall in a common direction. Opposite ends of the tubes are secured within the tubular pockets in the opposite end walls. A method of constructing the core includes the step of severing the tubular projections after the tube are positioned therein to expose the tube interiors through the end walls. Preferably, the tubular projections are severed using a hot wire to also fuse the tubes within the end walls.

Abstract: This invention is an improved heatseal die that forms superior airtight seals. The die has opposed die faces, with one die face having longitudinal lands and the other die face having grooves for receiving the lands. The lands are truncated and the depth of the grooves is greater than the height of the lands. As a result, the force applied by the lands and grooves is applied entirely as a shearing force, which forms the superior heatseals.

Abstract: The present invention relates to decorative imitation set jewels. A process for producing these imitation jewels is also disclosed.The imitation jewels are formed by causing a narrow margin of metal foil to adhere to the edges of a piece of a plastic film. The film may be cut by a heated die to any desired shape and may be of any color. The foil adhering to the edges of the plastic film gives the product an image of depth which is aesthetically pleasing. The rounding of the plastic film edge caused by the heated die enhances this effect.An adhesive backing is provided so that the imitation set jewels may be placed where desired. One envisioned utilization of the invention is for ornamenting one's fingernails.

Abstract: A method and system for preparing flat bottom thermoplastic sacks comprising process steps and means for forming a tube of thermoplastic film, collapsing said tube while forming two oppositely disposed gussets therein, simultaneously or spatially sequentially opening a gusset fold on each side of said collapsed tube to their full, lay-flat extent; simultaneously or spatially sequentially forming in each of the four gusset folds, a diagonal sealed seam over the portions of the tube width corresponding to the gussets along lines diagonal to the length of the tube so that the ends of the sealed seams of adjacent gusset folds are at least closely spaced or in contact so as to form an angle of at least approximately 90.degree.

Abstract: An ultrasonic seal and cut method and apparatus comprises an ultrasonic sealing and cutting station which includes a horn adapted to be resonant at an ultrasonic frequency and an oppositely disposed anvil having a sealing surface and a cutting surface. As sheet material is passed through the station, the sheet material is cut and sealed in a marginal area adjacent to the cut. A substantially thermoplastic thread, either monofilament or multifilament, is fed together with the sheet material through the station in a position to cause the thread to fuse with the material in the marginal area. The provision of the thread permits the ultrasonic seal and cut method to be used for sheet material having a relatively low thermoplastic fiber content or exhibiting an open mesh weave, or being made of natural fibers.

Abstract: The apparatus for producing pouch packages in pairs has two tube shaping devices disposed beside one another and two crosswise closure devices. To prevent having to stop both tubular pouch shaping devices at the same time in the event of an interruption or malfunction, or when changing a roll of packaging material, the crosswise closure devices are disposed on separate carriers. The carriers which are movable up and down individually can be coupled with a reciprocating element, which is moved incrementally up and down by a drive mechanism.

Abstract: An apparatus for making bags from a multilayer synthetic-resin strip workpiece has a vertically displaceable upper welding element which has an upper upstream welding tool extending across the strip and an upper downstream welding tool generally parallel thereto, and a blade fitted in the tool element to project downward from the upper tools.

Abstract: An apparatus for forming an article out of superimposed heat-sealable panels comprises a conveyor for moving a pair of superimposed webs along a path and into a cutting and sealing station whereat the panels are cut out of the webs and simultaneously heat-sealed together. The simultaneous cutting and sealing steps are effected by a unitary die having a cutting die that is heated to a predetermined cutting temperature and a sealing die that is heated to a predetermined sealing temperature that is substantially lower than the cutting temperature. The apparatus also includes steering means for automatically shifting a belt of the conveyor to maintain it in proper alignment and a scrap removal station for removing the web after the cutting and sealing operation.

Abstract: A method of manufacturing a self-supporting measuring probe suitable for application in a highly corrosive environment such as for example in a muffler or suction channel of a motor vehicle, is disclosed. The probe is provided with a protective foil which is applicable on a rigid substrate carrying the measuring layers, by means of a heat sealing process in which heat and pressure are simultaneously applied on the foil. In a preferred embodiment, the edges of the foil are fused to the substrate by a laser beam.

Abstract: Apparatus and method for heat sealing a selected segment of a web of at least two layers of biaxially oriented plastic film. The web layers are pressed together and a selected segment of the pressed web is heated above the bonding temperature of the plastic while adjacent web segments are maintained below that temperature. The surfaces pressing thus the heated web segment has a relatively lower surface friction than the surfaces pressing the adjacent web segment, whereby the layers of the heated segment of the web are physically unrestrained against shrinking during heating and are allowed to shrink back to their pre-oriented molecular configuration while the adjacent segment is restrained against movement. A hermetic bead seal is thus formed between the web layers. A product heat sealed according to the novel method is also disclosed.

Abstract: An apparatus and method of forming individual sealed plastic bags from a continuous web of a layflat tubular film material wherein the individual plastic bags, subsequent to the formation of bag seals and the separation of the film web into individual plastic bags, are intermittently and sequentially conveyed through a cooling zone which will allow for the cooling of the bag seals. Thereafter, the bags are serially conveyed to a bag stacking arrangement incorporating a stacker foot which will position the first or bottom bag of a stack being formed on a vacuum box which retains the bag in a fixed position and with subsequent bags being superimposed on preceding deposited bags and sealed thereto through the intermediary of heated needles depending from the stacker foot which will penetrate and concurrently seal the bags together at predetermined locations.

Abstract: In a carpet having a through bore, the through bore is formed by fusion-cutting. A hem member is welded integrally to the areas of a napped portion and a base cloth at the circumferential edges of the through bore. This prevents the threads of the napped portion existing at the circumferential edges of the through bore from fraying and also keeps such areas from being stained with oil or the like. Also, a method of welding said hem member to said base cloth is disclosed which comprises: laminating a thermally weldable synthetic resin film for hemming on a carpet, punching out a through bore in the synthetic resin film by means of a high frequency wave, and at the same time welding the hem member integrally to the wall edges of said punched through-bore. The simultaneous operation--welding of the hem member and punching of the through bore--provides a carpet quite easy to form and less expensive.

Abstract: What is disclosed is a method for making a gastight multiple-walled panel of extruded resin from an integrally extruded hollow panel comprising two parallel, plane outer walls having supporting partitions disposed between them and defining long hollow cells with open end faces, which method comprises heating the hollow panel at least in the area of the open end faces of said hollow cells until the resin is in the thermoplastic state, and then heat sealing the two outer walls in the thermoplastic area thereof in a gastight manner either to each other or to a tape of a further thermoplastic material covering the end faces, the seal so produced being held for at least 1 minute at a temperature ranging from 10.degree. C. beneath the Vicat softening point to 20.degree. C. above the Vicat softening point of the resin.

Abstract: A method of continuously producing a series of tubular labelling sleeves, which method comprises (a) printing on each of the upper and lower outer faces of a flat tube or resilient material a sequence of desired images, the image on the upper face of the flat tube being printed in register with the image on the lower face of the flat tube; (b) removing the longitudinal edge portions of the flat tube from each of the two sides of the tube; (c) forming at regular intervals a seal across the width of the resilient material so as to seal together the upper and lower sides of the tube, steps (b) and (c) being performed in either order; and (d) severing the tube across its width along the resultant seal thereby to form a tubular sleeve.

Abstract: The several embodiments illustrated in the FIGS. show welding apparatus for joining a plurality of plies of laminar thermoplastic materials held in and by gripping apparatus such as clamp jaws or belts. The weld is made by locally melting said plies by heating their protruding edges to a determined degree and for a determined period of time. Heat is brought into close proximity to the melt area and the gripping means provides a cooling means for the gripped plies of film. The completed welds are then cooled. The welding apparatus may be applied to material plies to seal their edges, or to seal the plies intermediate their edges. The welding is also shown as produced by continuous means and a heated ribbon may provide the severing means.

Abstract: An electric heating element for sterilely cutting and welding together a pair of thermoplastic tubes transversely of the axis of each tube includes as an outer layer a folded sheet of a metal, such as copper, aluminum, silver or gold, having a thermal conductivity of at least about 173 watts/m.degree.K at a thickness of 0.10 mm and a tensile yield strength of at least 34.times.104 kPa at a 0.10 mm thickness. A resistance heating element, preferably having a positive thermal coefficient of resistance (PTC), in the form of a resistor of stainless steel or the like is disposed inside the fold of the metal sheet and a layer of dielectric adhesive, such as an epoxy or acrylic adhesive, stable to about 260.degree. C., is disposed between the inner surfaces of the metal sheet and the resistor to insulate the resistor from the folded sheet and bond the resulting structure together. The folded edge of the metal sheet forms the melting edge of the heating element. The heating element has a thickness of from about 0.

Abstract: A method and an apparatus for cutting woven labels. According to the invention, the woven labels, in the form of a continuous ribbon or the like, are fed step by step towards an ultrasonic wave cutting device, where each label is centered and pressed between a first cutting element defining the outline of the label and a second cutting element, aligned with the first, constituting an ultrasonic wave emitter; an ultrasonic impulse of adequate frequency and intensity, causes the cutting and simultaneous cold welding of the label all around the edges.

Abstract: A method of manufacture of an article such as a corneal implant glide, formed of two resin film elements, each of which must be precision cut to a predetermined size and configuration with smooth, burr-free edges and with a narrow welded band of precisely controlled characteristics joining the two film elements along mating edges, comprises the steps of aligning two resin films in overlapping relation and constraining the films to maintain them in surface-to-surface contact with an exposed area at least as large as that required for the finished article. A laser beam of extremely small dot-like cross-section, preferably about 0.005 inch (0.127 millimeter) diameter, is directed to impinge upon the exposed area of the films and the beam is then moved, relative to the exposed film area, along a precisely controlled path corresponding to the outline of the article, including the aforementioned mating edges, to cut the two films to the precise required shape and simultaneously weld the two films together.

Abstract: The invention includes apparatus for and process of forming a plurality of plastic mounting envelopes from continuous plastic sheet material through cutting the plastic and bead sealing the margins by providing a high energy source to sever the plastic and bond the marginal edge of said plastic without physical contact.The invention also includes said plastic envelopes to serve as mounts and protectors for receiving flat paper objects such as stamps, letters, etc.

Abstract: Apparatus and process for ultrasonically cutting off undesirable selvage and sealing the longitudinal cut edges from both sides of continuous lengths of textile fabric having at least some thermoplastic yarns therein. The apparatus and process are characterized by cutting off a predetermined width of the undesirable selvage from each side of the textile fabric regardless of the transverse variations in the path of travel of the fabric through the apparatus or width of the fabric. The apparatus utilizes a mechanism for shifting the moving textile fabric relative to a stationary ultrasonic cutting and sealing mechanism on one longitudinal edge of the fabric and a mechanism for shifting a movable ultrasonic cutting and edge sealing mechanism relative to the other longitudinal edge of the moving textile fabric.

Abstract: An ultrasonic separation apparatus is disclosed which provides simultaneous cutting and sealing of thermoplastic materials. Both relatively thin and thick materials may be cut and sealed. The apparatus includes a cutting mechanism having a cutting blade mounted for oscillatory movement along its longitudinal axis. Cutting takes place at a controlled rate to allow sufficient time for simultaneous sealing to occur. The apparatus may be particularly adapted for cutting strings of pocketed coil springs to length.

Abstract: In a transverse severing apparatus for webs of thermoplastic material, two parallel pressure bars are lowerable onto and raisable from a section or sections to be severed from the web. The upstream pressure bar clamps the leading end of the web to a backing bar. The second pressure bar, which is disposed between a severing knife and the upstream bar, tensions the web clamped between a pair of feed rollers and the upstream pressure bar before the severing knife cuts the web.

Abstract: This invention provides an improvement in a method of slitting and sealing two or more layers of plastic film material in contact with each other. The improvement comprises slitting and sealing the layers with a light beam generated by a laser. The beam intensity is such that the temperature of the beam at the surface of the film is at a point sufficient only to raise the enthalpy of the material to the transition point between the molten and solid states of the material, whereby bead formation is reduced or eliminated at the seal. Methods are also disclosed for slitting a larger single sheet of material into two or more smaller sheets of material as well as for providing microperforations or microporous plastic material by the use of a pulsing beam generated by a laser.

Abstract: A heat sealable film laminate having a first layer of a major amount of a high density polyolefin, a minor proportion of an adhesion promoting ionomer and a heat seal promoting proportion of a metal salt of a fatty acid; and a second layer adhering to the first layer, said layer comprising a polyamide. A food storage and heating bag formed from said laminate and a method of heat sealing said laminate.

Abstract: A continuous web in the form of a hose-like thermoplastic foil is intermittently fed through a welding and severing station in which two transverse weld seams on the foil are made and simultaneously a cutting blade severs a completed bag along a line between the weld seams. A transfer unit arranged immediately below the welding station temporarily seizes the severed bag, displaces the same a small distance in feeding direction, and then dashes the rear portion with the still plastic weld seam against an alignment line of a stacking station. The stacking station is arranged a small distance below the welding station at the other side of the severed bag, and the still plastic weld seam fuses with the corresponding weld seam of the preceding bag interlocked in the stack. The completed stack is discharged in a perforating station where the tearing line is perforated simultaneously through all stacked bags. If desired, additional holes are punched between the upper edge of the bag and the perforation line.

Abstract: An apparatus for cutting thermoplastic foam material, such as polyethylene foam or rigid polystyrene foam, includes an electrically heated cutting element made from a steel band and having a sharpened front longitudinal edge and a rear longitudinal edge spaced from one another by a width dimension of the band which is many times greater than the thickness thereof. The opposite end portions of the cutting element are parallel and close to one another and are each releasably gripped by a separate set of jaws which engage the front and rear edges of each end portion to mechanically support and supply electric current to the respective end portions. Each set of jaws includes a stationary jaw and a movable jaw. The movable jaws are connected for operation by a single operating member for movement in unison relative to the stationary jaws to facilitate rapid insertion and removal of the cutting element from the jaws.

Abstract: A process for producing bundles of high modulus polyethylene fibers for reinforcement in composites wherein the matrix is a brittle material such as cement, concrete, plaster of Paris or the like. The process involves passing high modulus polyethylene yarn through high pressure nip rolls to deform the individual filaments and to form a loosely adhering unitary mass or bundle of filaments which is then chopped into short lengths for use as fibrous reinforcement in composites. In a preferred embodiment, the yarn is twisted prior to being passed through the nip rolls.

Abstract: A method of manufacturing a self-supporting measuring probe suitable for application in a highly corrosive environment such as for example in a muffler or suction channel of a motor vehicle, is disclosed. The probe is provided with a protective foil which is applicable on a rigid substrate carrying the measuring layers, by means of a heat sealing process in which heat and pressure are simultaneously applied on the foil. In a preferred embodiment, the edges of the foil are fused to the substrate by a laser beam.