Reciprocatory Cutting, Breaking, Tearing, Abrading, Or Form-scoring Tool Patents (Class 493/61)
  • Patent number: 9039589
    Abstract: A filter paper cup manufacturing machine produces filter paper cups packaging suitable for containing a brewing material. The filter paper cup packaging has similar depth and diameter. The machine exercises ordered steps of first cutting a receptacle portion and cover portion for each individual packaging and then forming a recess in the receptacle portion for receiving the brewing material. Performing the cutting step first facilitates forming the recess because surrounding filter paper which would resist forming the recess has been eliminated.
    Type: Grant
    Filed: January 22, 2011
    Date of Patent: May 26, 2015
    Inventor: Adrian Rivera
  • Publication number: 20140069933
    Abstract: A system and method for reducing manufacturing costs of patterned constructible utensils and improving their constructability. One constructible utensil includes a set of scores (e.g., a quad of scores including an outer pair and an inner pair, a single such pair, or other number of scores) that are shaped to converge when moving from a bowl-region towards the handle portion. The scores do not intersect but stop and produce various alterations in the converging score pattern. These alterations in the converging pattern help with propagation of a bowl-forming fold responsive to a constructing manipulation of the handle portion (e.g., folding, bending, and other operation on the handle portion and one or more scores on the handle portion).
    Type: Application
    Filed: March 12, 2013
    Publication date: March 13, 2014
    Applicant: EcoTensil Inc.
    Inventor: Peggy V. K. Cross
  • Patent number: 8215085
    Abstract: The disclosure relates to a method of preparing a web of flexible material for production of receptacles for packaging. The method comprises the steps of feeding a web of flexible material past a succession of stations in which operations are carried out on the web including defining blanks for receptacles having walls and tabs by creating fold lines in the web, and then laminating a film of heat-sealable plastics materials to a face of the web of the flexible material. The film of heat-sealable plastics provides a heat-sealable surface on the web for bonding tabs of each blank together to form seams between adjacent walls whereby the blanks, when severed from the web, can be erected to form receptacles having openings to receive items to be packaged.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: July 10, 2012
    Assignee: Rapid Action Packaging Limited
    Inventors: Quang Tien Phung, Fernanda Costa Pereira, Julian David Kyrle Money
  • Patent number: 7882720
    Abstract: An automatic bending machine produces a steel rule punching die to be used for forming predetermined notch lines or fold lines in a paper strip, a sheet, a board member, or the like in production of a paper container or a corrugated box. The automatic bending machine has a bending tool which bends a band blade into a predetermined shape. In the machine, a diamond grinder which is laterally and vertically moved by a computer control is disposed in front of the bending tool. When the bending tool is combined with the diamond grinder, bending of the band blade, linear cutting of the both ends, nicking of a blade edge, bridging (notching) of a blade bottom, and broaching (slotting) of a blade side wall are enabled.
    Type: Grant
    Filed: March 14, 2005
    Date of Patent: February 8, 2011
    Assignee: Suehiro Mizukawa
    Inventors: Suehiro Mizukawa, Toshinaga Urabe
  • Publication number: 20090029837
    Abstract: A stitch flap cutting block is mountable to a cutting head of a board blank cutting machine, along with a slotting knife. A sheet of board passed between the cutting head and an anvil head is cut to form a blank for a box or the like. The cutting block comprises a steel body with a cylindrical barrel holding a cylindrical spring block, to which is mounted a blade holder carrying an elongate blade. The blade moves within a transverse slot across the body and is deflectable into the body and may rock about a midpoint of the slot. Impact forces are reduced, cleaner cuts are produced, and re-setting of the blade is required much less often. An alternative stitch flap cutting block is mountable to the cutting head by a separate side arm, facilitating mounting cutting to heads having different diameters.
    Type: Application
    Filed: July 25, 2008
    Publication date: January 29, 2009
    Applicant: Mansfield Board Machinery Limited
    Inventors: Ian Charles MANSFIELD, Terence Roy Stone
  • Patent number: 7311648
    Abstract: Stamping of a layer (2) of package material, such as cardboard or plastics, for forming one or more bending edges may take place according to the invention by a method wherein a stamping tool (8), which is provided with preferably three ribs (9a, b, c), is pressed down into the layer (2) and thereby forms slots (11a, b, c) in the bending edge in one working cycle. The stamping may take place very precisely, and since the stamping is carried out in one working cycle, an uprecedentedly high production rate may be achieved. Since the stamping tool does not need a lower tool part, but merely a support (10), the stamping may be performed simultaneously with the punching in one and the same working cycle.
    Type: Grant
    Filed: October 18, 2004
    Date of Patent: December 25, 2007
    Inventor: Jes Hilfing Petersen
  • Patent number: 7160237
    Abstract: A plastic sheet with a bending rule line, having satisfactory bending properties and pliability, feeling soft, having a fine appearance, and allowing a bending operation to be mechanically performed; and a ruled line blade for such plastic sheet. A bending ruled line (2) added to the bending portion of a plastic sheet (1) is formed, and shallow grooves (3) are formed along the bottom surface (2b) of the bending ruled line 2 and at predetermined longitudinal intervals, while a plurality of grooves (4) deeper than the shallow grooves (3) are formed longitudinally along the bottom surface (2b) between shallow grooves (3,3).
    Type: Grant
    Filed: March 7, 2003
    Date of Patent: January 9, 2007
    Inventors: Tadashi Hashimoto, Hisashi Hashimoto
  • Patent number: 6691598
    Abstract: A lightweight, dimensionally stable steel rule die for cutting and scoring carton blanks having a die board containing cutting and scoring rules which is formed of a laminated plastic construction adapted to register and coact with a steel counterplate over prolonged production runs and maintain registration within a tolerance range of about ±0.002 inches.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: February 17, 2004
    Assignee: Atlas Die, Inc.
    Inventors: Russell S. Brayton, Michael Kush, Robert McArtan
  • Patent number: 6672815
    Abstract: Apparatus for scoring a cover to be applied to a bound stack of sheets to form a book. A base unit is provided having a surface for receiving the cover, an lower die holder disposed below the surface and an upper die holder disposed above the surface. A lower die is supported on an upper surface of the lower die holder and an upper die is supported on the lower surface of the upper die holder. An actuating structure such as a handle, is used to move the upper and lower die between an open position and a closed where the upper and lower die score the cover. The upper die holder is fabrication using a transparent material so that a user can view the upper die and underlying cover to facilitate proper alignment.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: January 6, 2004
    Assignee: Powis Parker Inc.
    Inventors: Kevin P. Parker, Wayne Kasom, Evelyn Steiner, William M. Elliott
  • Patent number: 6582348
    Abstract: A machine is provided for the creasing, perforation or circular cutting of a material in the form of sheets such as paper, plastic and the like. The machine includes a bed, a horizontal loading plane (11) that is intended to accommodate at least one stack of starting sheets, a feeding plane (13) as a continuation of the loading plane, an advancing suction roller (14) to pick up and transfer every single sheet from the bottom of the stack on the loading plane to the feeding plane, and a processing unit (15) that is intended to accommodate one sheet at a time for a creasing, perforation or cutting operation. A female grooving tool, each consisting of annular elements that are assembled together, is provided for the creasing.
    Type: Grant
    Filed: May 3, 2001
    Date of Patent: June 24, 2003
    Inventors: Silvano Bacciottini, Valdemaro Bacciottini
  • Patent number: 6544158
    Abstract: A processing station (10) for high speed printing, handling and die cutting of blanks or blanks (26) is provided which includes a clamshell-type die cutter (12), as well as a feeding device (14) including a transfer mechanism (16) and pickup member (18). The station (10) may also include a printing assembly (20) and a cut blank removal assembly (22). In operation, individual blanks (26) from a stack (28) are successively fed by the transfer mechanism (16) and are picked up by the member (18); the blanks are delivered to the die cutter (12) when the latter is open and after die cutting the removal assembly (22) is employed to lift the cut blank (26) from the cutter (12) and shift the blank (26) to a slide plate (116). A pusher bar (122) then operates to move the cut blank (26) to an outfeed conveyer (146). The station (10) is capable of handling relatively thick corrugated blanks (26) at high speed and without constant operator attendance.
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: April 8, 2003
    Assignee: Lawrence Paper Company
    Inventors: Alan M. Hill, William R. Meeks
  • Patent number: 6276045
    Abstract: Upper and lower mirror image die plates are resiliently supported and have predetermined displacement values for forming vortex generators and foldline crease channels without compressive deformation in a porous sintered metal fiber sheet material. Cutters and ridges coupled to the upper and lower die plates form the respective vortex generators and channels. The sheet of so formed material is then placed in an apparatus for bending the sheet at the foldline channels to corrugate the sheet without deformation of the sheet material between the corrugation bends. Fingers align with and engage the channels. The fingers are on plates that are ramped closer together simultaneously while the fingers on two mirror image coplanar sets of plates displace toward each other as the sheet material is folded. Pins on a pair of rotating levers engage each of the finger plates of the two sets for relatively horizontally displacing the plates and corresponding fingers as they are ramped together vertically.
    Type: Grant
    Filed: October 28, 1998
    Date of Patent: August 21, 2001
    Assignee: ABB Lummus Global, Inc.
    Inventors: Franz B├╝chi, Ernst Vogt, Peter Dubach, Timothy Griffin, Jonathan Lloyd, Bettina Paikert
  • Patent number: 6245004
    Abstract: A machine (10) for performing a manufacturing operation on a sheet of material (12) includes an upper tool (282, . . . ) for engaging an upper surface (602) of the sheet of material (12) and a lower tool (380, . . . ) mateable with the upper tool for engaging a lower surface (606) of the material opposite to the upper surface. The upper and lower tools are arranged to cooperate in performing the manufacturing operation. A drive mechanism (456, 522, . . . ) is provided for causing relative movement between the tools and the sheet of material, back and forth along a first axis (24) and back and forth along a second axis (518) substantially perpendicular to the first axis while performing the manufacturing operation. The invention includes a method of performing the manufacturing operation utilizing the machine (10).
    Type: Grant
    Filed: July 28, 1999
    Date of Patent: June 12, 2001
    Inventor: Michael A. Waters
  • Patent number: 6203482
    Abstract: An apparatus for substantially-simultaneously die cutting cardboard sheets for forming folded cardboard cartons and an openable and closable tab. The improvement resides in a die set comprising a plurality of cutting knives projecting from a base, the cutting knives being fixed into a preselected pattern of grooves within the base. The die set may further include at least one transversely-spaced-apart pair of a die blade and a perforating knife mounted in the base, in which either or both of the die blade or the perforating knife is “jackably mounted” for selective manual raising or lowering. The die set may alternatively further include at least one transversely-spaced-apart pair of a die blade and an anvil mounted in the base, in which either or both of the die blade or the anvil is “jackably mounted” for selective manual raising or lowering. In either case, the base is secured to a back-up plate.
    Type: Grant
    Filed: December 10, 1998
    Date of Patent: March 20, 2001
    Inventor: Peter Nmi Sandford
  • Patent number: 5943935
    Abstract: A lightweight, dimensionally stable steel rule die for cutting and scoring carton blanks having a die board containing the cutting and scoring rules which is formed of a laminated plastic construction adapted to register and coact with a steel counterplate over prolonged production runs and maintain registration within a tolerance range of about .+-.0.002 inches.
    Type: Grant
    Filed: March 3, 1997
    Date of Patent: August 31, 1999
    Assignee: Atlas Die, Inc.
    Inventors: Russell S. Brayton, Michael Kush, Robert McArtan
  • Patent number: 5904643
    Abstract: A process and apparatus for forming three-dimensional containers from a continuous flat web of paper, coated paper, paper board, or laminated paper board ("paper") in which the paper is first scored to define the shape of the container and, thereafter, the scored stock is simultaneously cut and formed into a container. Containers so produced have improved uniformity. The apparatus is less expensive and easier to operate than conventional equipment, and it is easier to change from one style of tray to another. The apparatus also makes possible tray styles which could not be made with machines which cut and transfer paper blanks to a separate forming station.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: May 18, 1999
    Assignee: Tenneco Packaging
    Inventors: Edward J. Seeberger, Harold H. Hayes III, Vaughn R. Bryson
  • Patent number: 5897479
    Abstract: The punching and scoring tool produces scored punched parts from a material sheet and has a carrier board, which is provided on its underside with punching elements and a scoring plate, on the underside of which scoring projections are arranged. A punching/scoring plate, in which scoring grooves are formed under the scoring projections, is provided under the carrier board. Leveling bushes are provided in the carrier board and bear against the scoring plate to provide an accurate supporting plane for the scoring plate.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: April 27, 1999
    Assignee: Karl Marbach GmbH & Co.
    Inventor: Rolf Sinn
  • Patent number: 5370028
    Abstract: A strip steel punching and indenting tool (15) and a method for preparing this type of tool wherein the tool, arranged between a ram (12) and an anvil (14) of a punching machine (10), comprises a supporting plate (16) with slots (18) extending from the lower side of the supporting plate facing the anvil (14) to its upper side facing the ram (12). Each of the slots (18) accommodates a cutter of strip steel for punching (20a, 20b) and indenting (20c), in such a way that the hardened cutting edge (22) of a cutter protrudes from the lower side of the supporting plate (16) and the rounded non-cutting backs (24) thereof face a first intermediate plate (26) of metal mounted on the upper side of the supporting plate. To be able to prepare the punching and indenting tool within a short period of time without impairing the punching performance of the punching machine, the first intermediate plate (26) is between 0.8 and 1.5 mm thick, consists of a metal with a 0.2-tensile yield strength R.sub.p0.2 of 20 to 90 N/mm.sup.
    Type: Grant
    Filed: May 2, 1994
    Date of Patent: December 6, 1994
    Assignee: Karl Marbach GmbH & Co.
    Inventor: Wolfgang Grebe
  • Patent number: 5319910
    Abstract: A multilayer container having a flange portion and an easily-openable packaging container packaged by using said multilayer container, wherein the interlaminar strength of said multilayer container is smaller than the peelig strength between said flange portion and the lid member, and a ring notch is provided to an inner surface layer of the flange portion inside a heat seal portion. The packaging container has both of a good sealing property and an easy openability and has an excellent resistance to boiling and retort treatment, and peeled surface has a good appearance. A method for producing said multilayer container and a method for producing said packaging container, and an apparatus to be used for producing said multilayer container, and a method for filling and packaging, and an apparatus for filling and packaging are disclosed.
    Type: Grant
    Filed: November 6, 1992
    Date of Patent: June 14, 1994
    Assignee: Idemitsu Petrochemical Co., Ltd.
    Inventors: Yukio Takata, Takeshi Shinohara
  • Patent number: 5072507
    Abstract: An improved box blank die cutting machine (20) is provided which includes die changeover apparatus (32) permitting the machine die structure (28) to be rapidly changed without the necessity for completely removing the die frame (26) from the machine (20). The changeover apparatus (32) includes die-supporting elements (156, 158) designed to support the die frame (26) as it is shifted rearwardly towards the output end (46) of the machine (20). Moreover, the elements (158) include selectively extensible pins (184a, 184b) which are received within corresponding die frame apertures (108, 110), so that the die frame (26) may be pivoted to an upright die changeover position. Limit stops (188, 190) are also provided for limiting the pivoting movement of the die frame (26), and for stabilizing the die frame (26) in its upright position.
    Type: Grant
    Filed: October 30, 1990
    Date of Patent: December 17, 1991
    Assignee: The Lawrence Paper Company
    Inventor: William R. Meeks
  • Patent number: 5052992
    Abstract: A cut and score die apparatus is provided for progressively converting a sheet of material into blanks. The apparatus includes a punching section for punching scrap material from the sheet of material to define an array of interconnected blanks arranged in a grid of rows and columns on the sheet of material. A scoring section is provided for simultaneously scoring a first predetermined pattern on a trailing portion of a first row of blanks and a second predetermined pattern on the leading portion of a second, succeeding row of blanks on the sheet of material. A blanking section is also provided for piercing the sheet of material in a predetermined pattern to cut blanks from the sheet of material without producing any additional scrap material.
    Type: Grant
    Filed: February 6, 1990
    Date of Patent: October 1, 1991
    Assignee: Peerless Machine & Tool Corporation
    Inventor: L. Edward Hyder
  • Patent number: 4931031
    Abstract: A method of forming a skived edge on the inside panel of a thermoplastic coated paperboard container, in part while the container is part of a web or sheet of paperboard material, and in part on individual blanks after being cut from the web or sheet. More specifically, a partial depth cut and an adjacent score line are formed on a carton converting machine providing a precise location for subsequently removing material and folding the edge of a blank on a side seam sealing machine.
    Type: Grant
    Filed: June 30, 1989
    Date of Patent: June 5, 1990
    Assignee: Elopak Systems AG
    Inventor: Robert E. Lisiecki
  • Patent number: 4822325
    Abstract: Apparatus for imprinting or impressing a sheet of material such as cardboard intended to be made into a die for making a folding box or case, comprises a stamping plate for carrying the sheet and co-operable with a tool. The stamping plate lies on a table plate of a frame structure which has holders for releasably carrying a form which extends parallel to the table plate, and at least one bridge assembly which extends movably above the table plate. A carriage is carried on the bridge assembly and moves transversely with respect to the direction of travel thereof. The carriage carries at least one vertically movable pressure member directed towards the table plate.
    Type: Grant
    Filed: June 12, 1987
    Date of Patent: April 18, 1989
    Assignee: Meurer Nonfood Product GmbH
    Inventor: Franz Vossen
  • Patent number: 4767393
    Abstract: A flat platen-type cutting and creasing press for sheet material includes a continuously moving closed loop conveyor that carries sheet gripping means in a feed direction along a generally horizontal feed path extending through a sheet loading station, a sheet unloading station, and a cutting station having die elements positioned thereat with the cutting station being positioned between the sheet loading and unloading stations. Eccentric shafts rotating at uniform speed translates platens carrying the die elements along a circular path positioned for the die elements to operatively engage and thereby fully cut a sheet moving along the feed path through said cutting station. Rotating counterbalancing weights on the eccentric shafts are disposed between points on the platens that are connected to the eccentric shafts.
    Type: Grant
    Filed: December 8, 1986
    Date of Patent: August 30, 1988
    Inventor: Edwin K. Smith
  • Patent number: 4710156
    Abstract: Apparatus for processing a sheet of material such as cardboard intended for making a folding box or case, comprises a stamping plate for carrying the sheet and co-operable with a tool. The stamping plate lies on a table plate of a frame structure which has holders for releasably carrying a form which extends parallel to the table plate, and at least one bridge assembly which extends movably above the table plate. A carriage is carried on the bridge assembly and moves transversely with respect to the direction of travel thereof. The carriage carries at least one vertically movable pressure member directed towards the table plate.
    Type: Grant
    Filed: June 21, 1985
    Date of Patent: December 1, 1987
    Assignee: Meurer Druck & Carton GmbH
    Inventor: Franz Vossen
  • Patent number: 4604850
    Abstract: Two-piece containers having a one-piece tubular body and base and a cover molded onto the body are formed from a continuous web of thermoplastic supporting material by means of an apparatus which includes tube forming, cover molding, container filling and container base sealing stations. The web of material is initially formed into a strand of partially assembled tubular container bodies having fold impressions for the base and then severed into separate tubular bodies for further processing, filling and sealing.
    Type: Grant
    Filed: July 17, 1984
    Date of Patent: August 12, 1986
    Assignee: Tetra Pak Developpement S.A.
    Inventor: Wilhelm Reil
  • Patent number: 4568323
    Abstract: Strip steel stamping knives (1) and, if desired, the strip steel folding rules (2) of a strip steel stamping tool are provided in slots (3, 4) in a carrier plate (5). The strip steel stamping knives and, if desired, the strip steel folding rules protrude downwardly from the carrier plate to cooperate with a counter stamping plate (7). The backs of the stamping knives (1) and, if desired, of the folding rules (2), face a hardened pressure plate (9). In order to achieve an automatic height or elevational adjustment of the stamping knives (1), and if desired, of the folding rules (2), the backs of the stamping knives and, if desired, of the folding rules, are also constructed as hardened cutting edges (11, 12). An intermediate plate (10) is placed between the carrier plate (5) and the pressure plate (9).
    Type: Grant
    Filed: May 7, 1984
    Date of Patent: February 4, 1986
    Assignees: R & S Stanzformen GmbH, Karl Stursberg KG
    Inventor: Walter Roeder
  • Patent number: 4559259
    Abstract: A packing laminate which is intended to be converted into packing containers is often provided with crease lines in order to facilitate folding and shaping. At the places where crease lines cross each other a multiple folding of the laminate takes place on conversion into packing containers which, among other things, means that small cracks are formed in the different material layers, so that the tightness of the packing container is put into jeopardy. In accordance with the invention, a packing laminate is proposed in which these difficulties are overcome by providing the laminate with specially designed auxiliary crease lines which in the region of the laminate, where the folding lines cross each other or meet, replace the (main) crease line guiding the folding line. The auxiliary crease lines are situated at such a distance from the main crease line that the folding line is not affected, that is to say, the folding line will after folding not coincide in any part with the auxiliary crease lines.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: December 17, 1985
    Assignee: Tetra Pak International AB
    Inventor: Renato Cetrelli
  • Patent number: 4541828
    Abstract: A tool support having an arrangement for centering and fixing a tool and a rectangular frame characterized by a pair of pressing members mounted on adjacent sides of the frame and an arrangement to urge the pressing members away from their adjacent frame members so that a tool is moved diagonally toward an opposite corner of the frame. Preferably, one of the pressing members has a slanted plane end surface forming a cam surface which is engaged by a roller mounted on the other pressing member so that movement of the other pressing member is transferred to the one pressing member. The mounting arrangement also includes a tightening arrangement to bias the pressing members away from the adjacent side members of the frame.
    Type: Grant
    Filed: April 4, 1984
    Date of Patent: September 17, 1985
    Assignee: Bobst S.A.
    Inventor: Georg Polic
  • Patent number: 4491267
    Abstract: The invention provides a process for making a dry powder box with greater geometrical stability and free of pin holes, gaps and the like through which powder may sift. The process uses a carton blank having a bottom closure wherein a pair of relatively large, opposing dust flaps are first folded into the carton tube, in order to define, maintain and stabilize the cross section of the carton. Then, a pair of relatively smaller, opposing major flaps are folded and glued over the open sides of the large dust flaps. This combination of flaps keeps the large flaps from working out of alignment and helps maintain the cross sectional stability of the box. The top of the carton may be a gable having panels at the ends of the gables which are slightly larger than the cross section, of the gable roof sides. When the gable is formed, the larger ends are pushed down to create a leverage which closes the top opening more securely. The cut lines which form and define the flaps extend across approximately 80.degree.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: January 1, 1985
    Assignee: Tisma Machine Corporation
    Inventor: Steven Tisma
  • Patent number: 4399935
    Abstract: A carton construction and method of making an integral cutting edge therefor. An intermittent cut-score line is utilized at the juncture of the front and bottom main panels the cut segments of which extend into the front panel to provide a plurality of discrete teeth for the cutting edge. The end portions of each cut segment terminate approximately at the juncture of the front and bottom panels so that the space between the cut segments provide an axis for folding between the front and bottom panels in erecting the carton. Additionally, the individual teeth are stiffened by applying a coating thereto. The carton blank is formed into an open ended tube and a plurality of these tubes, in flattened condition, are stacked with the cutting teeth uppermost in which position they are coated, such as by a roller coating.
    Type: Grant
    Filed: February 11, 1981
    Date of Patent: August 23, 1983
    Inventor: Barbara L. Nelder
  • Patent number: 4386925
    Abstract: A multi-layer bonded foil 10 which forms the inner wrapper of a cigarette pack is provided with a tear line 14 to facilitate opening a tear flap 15. The tear line is formed by a fixed lower tool 25 having a raised rib 28 flanked by grooves 29, 30 and a reciprocable upper tool 20 having a pointed edge 21 and movable between guide supports 22, 23. The upper tool is heated and forced into the foil to stretch-weaken its upper polyester layer 11 and central aluminum foil layer 12, and to simultaneously heat soften and deform its lower polyethylene layer 13.
    Type: Grant
    Filed: May 26, 1981
    Date of Patent: June 7, 1983
    Assignee: Focke & Co.
    Inventor: Heinz Focke
  • Patent number: 4386926
    Abstract: A method, apparatus for forming, and article formed of folded, relatively rigid sheet plastic material (e.g. polyolefin is disclosed). A hinging membrane forming a flexible fold line provides stress-relief indentations in the sheet material so that the tensile and compressive strains normally produced when bending the sheet material at the folds are substantially relieved, thereby permitting efficient production of a variety of sheet plastic articles, such as folding containers and the like.Two embodiments of the invention are disclosed.In one embodiment, the stress-relief indentations are simultaneously formed on opposed surfaces of the sheet material at the desired fold line by an apparatus having an unheated die containing a scoring blade mounted for movement against the material to be scored, which is supported on a hard and polished platen, with the plastic sheet material arranged between the scoring blade and platen.
    Type: Grant
    Filed: February 17, 1981
    Date of Patent: June 7, 1983
    Inventor: Joel Heller
  • Patent number: 4373929
    Abstract: A method and apparatus for cutting and scoring plastic and paper box blanks is disclosed wherein a creaseless score line is formed using a score forming strip which is aligned on one die platen and is transferred to the cooperating die platen in mirror image alignment.
    Type: Grant
    Filed: September 18, 1980
    Date of Patent: February 15, 1983
    Inventor: Paul W. Smith