Abstract: Improved method for corrugating paperboard, wherein a web of a corrugating medium is treated with a solid lubricant for a release agent and supplied to heated corrugating rolls to which a water mist has been applied evenly over the rolls. The web is shaped between the rolls by the application of pressure from the rolls and steam formed from the water spray. The availability of steam at the nip of the corrugating rolls provides improved flute formation and the solid lubricant allows the corrugated paperboard to release from the corrugating rolls without damage to the flutes. Standard corrugating equipment is enabled to operate at higher production rates and to accept lower quality paper for corrugating. Equipment is provided to maintain a supply of solid lubricant in a water suspension for application to the paperboard, preferably via a water spray directed on the corrugating rolls.

Abstract: The method disclosed consists of applying a plain tubular blank in polytetrafluorethylene to a cylindrical mandrel of a diameter providing for a clearance between said blank and mandrel corresponding to the depth of the corrugations to be formed. The blank is retained at its ends concentrically with the mandrel. A wire is then wound in a helical path around the blank under a tension ensuring the forming of helical corrugations, the blank being additionally retained at its outside surface within a zone preceding the zone wherein the corrugations are being formed. On forming the corrugations all the way along the surface of the blank, the product is heat treated at a temperature between 250 and 300.degree. C.

Abstract: Method and machine for fabricating plasticboard wherein areas of bonding are created with localized heating and pressure.

Abstract: The invention relates to the processing of photographic material such as photographic film which has a tendency to curl in roller type photographic processing equipment, without attaching a separate leader portion to the film. After removing the curl from an end portion of the film, it is processed in a roller type photographic processing equipment without curling around the transporting rollers.The invention also provides a method of making this leaderless processing possible. This is performed by deforming a portion of the photographic material so as to prevent the tendency to curl to allow positive self-leading through the roller type processing equipment. Another embodiment of the invention provides a one-piece, partially curled, photographic material wherein curl has been removed from a portion, thus making the film suitable for photographic processing equipment.Another embodiment provides an apparatus for preventing curl in a portion of photographic material.

Abstract: The present invention relates to an apparatus for corrugating a web of sheet material in a continuous process by means of an elongated mold movable in an endless closed path and composed of plate elements disposed in a row the one behind the other and in one straight portion together constituting a forming table having preferably diagonally extending, mutually parallel, grooves.The plate elements are by means of journals supported on and mounted in driving members disposed on either side of the path and equipped with turning wheels, the individual plate elements following the driving members with the same side facing upwards during the whole trave along the closed path.The primary field of application of the product manufactured in the apparatus are corrugated sheet pieces intended to form the fill in contact or exchanger bodies for two fluids, of which one may be a liquid, such as water, and the other a gas, such as air.

Abstract: This invention contemplates an apparatus for affixing to a papermaking felt a plurality of beads comprising means for supporting a papermaking felt having a working surface and means for applying beads of plastic backing, said beads extending away from said working surface and having top portions which are spaced from each other along said working surface to form channels for liquid flow.

Abstract: A double-walled pipe of thermoplastic material is produced, constituted of an inner pipe and an outer pipe concentric therewith, in which the outer pipe is formed into the shape of a helical thread. The pipes are extruded, the outer over the inner, and prior to the setting of the outer pipe it is subjected to forming into a helical thread by a rotating mold. The mold includes vacuum forming rollers spaced along a helical path about the outer pipe, the circumferential edges of the rollers being spaced at different distances from the longitudinal axis of the pipes.

Abstract: This invention relates to an improvement in the process for shirring cylindrical tubular casings, especially artificial sausage casings of synthetic material, in which an inflated casing is conveyed in the direction of its longitudinal axis and shirred, with pleating, against a counter-force by shirring forces acting upon the circumference of the casing, the improvement comprising that the forces acting upon the surface of the casing do so continuously and simultaneously, at equal intervals, at a plurality of points on at least two straight lines extending parallel to and symmetrically about the longitudinal axis of the casing, the action being at right angles to the longitudinal axis of the sausage casing, and circumferentially thereof, and, simultaneously, in the direction of the longitudinal axis of the casing, against said counter-force. The invention also relates to an apparatus for performing the process.

Abstract: There is disclosed a method for producing a bilayered green ceramic tape having a corrugated first layer and a substantially flat second layer bonded thereto. The method comprises the steps of supplying a flat pliable first layer of green ceramic material, forming said flat first layer to a shape having a corrugated cross section, and bonding a flat second layer to one side of the corrugated layer.

Abstract: A method of making a plurality of substantially identical flexible diaphragms for control devices comprising the steps of providing a plurality of sheets of polyester film each being approximately 0.0005 to 0.0010 of an inch thick and each being a circular disc approximately 41/2 inches in diameter and forming the diaphragms from the sheets so that each diaphragm has an annular corrugation formed therein concentric with the center thereof and inboard of the outer periphery thereof, the step of forming the diaphragms comprising the steps of disposing the sheets in stacked aligned relation in a mold and compressing and heating the sheets in the mold in the stacked aligned relation thereof to substantially simultaneously heat form the corrugations in the sheets to thereby make the diaphragms substantially identical to each other.

Abstract: A support material is fed through mating elements which emboss transverse score lines thereon to form an accordion fold in the material. A single thickness of the folded support material is then interleaved with a permeable membrane and sealed in a housing to form a compact inexpensive flat plate dialyzer. Longitudinal channels are formed in the support material which materially improve distribution of fluids within the dialyzer.

Abstract: A method of and apparatus for making toothed belts of rubber or rubber-like elastic synthetic materials with an enveloping fabric covering, the belt teeth, according to which an enveloping fabric strip is folded into successive folds corresponding to the belt teeth to be formed, and the cavities defining folded portions on the inside of said fabric strip are filled with elastomeric material of the type of which the belt teeth are to be made, whereupon layers of elastomeric material and straight members making up the remainder of the belt to be made are placed upon each other to build up the belt, whereafter the thus obtained assembly is vulcanized.

Abstract: Method for continuously forming a corrugated web of thermoplastic material in which the corrugations extend diagonally across the web. The web is first softened by heat and then passed to a molding belt which moves in an endless path while supporting and advancing the web in a longitudinal direction. The molding belt is provided with grooves corresponding to the corrugations in the web. The corrugations are formed initially by poking the softened web progressively into the grooves without stretching the web to any substantial degree. The thus initially formed corrugations are thereafter drawn into the grooves and retained therein by applying suction to the bottom side of the molding belt.

Abstract: The invention relates to the processing of photographic material such as photographic film which has a tendency to curl in roller type photographic processing equipment, without attaching a separate leader portion to the film. After removing the curl from an end portion of the film, it is processed in a roller type photographic processing equipment without curling around the transporting rollers.The invention also provides a method of making this leaderless processing possible. This is performed by deforming a portion of the photographic material so as to prevent the tendency to curl to allow positive selfleading through the roller type processing equipment. Another embodiment of the invention provides a one-piece, partially curled, photographic material wherein curl has been removed from a portion, thus making the film suitable for photographic processing equipment.Another embodiment provides an apparatus for preventing curl in a portion of photographic material.

Abstract: A method for forming an extruded plastic sheet with vacuum pressure and without mating dies. The plastic sheet is extruded onto a heated portion of a supporting bed which maintains the sheet in a soft condition. The bed also includes a cooled portion adjacent to the heated portion with a plurality of parallel grooves which extend continuously through the cooled portion and at least partially through the heated portion. A vacuum pressure is provided within the grooves between the bed and sheet thereby pulling the sheet downwardly into the grooves. The residual heat within the sheet is then removed by the cooled portion of the bed to maintain the formed condition of the heated sheet. Various means are provided to maintain the vacuum pressure between the bed and sheet.