EP0776848A2 - Arête de coupe en plastique avec nervures coupantes - Google Patents

Arête de coupe en plastique avec nervures coupantes Download PDF

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Publication number
EP0776848A2
EP0776848A2 EP19960118599 EP96118599A EP0776848A2 EP 0776848 A2 EP0776848 A2 EP 0776848A2 EP 19960118599 EP19960118599 EP 19960118599 EP 96118599 A EP96118599 A EP 96118599A EP 0776848 A2 EP0776848 A2 EP 0776848A2
Authority
EP
European Patent Office
Prior art keywords
web
cutting edge
ribs
plastic
cutting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19960118599
Other languages
German (de)
English (en)
Inventor
Dee Lynn c/o Minnesota Mining and Manuf. Johnson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of EP0776848A2 publication Critical patent/EP0776848A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
    • B65H35/0006—Article or web delivery apparatus incorporating cutting or line-perforating devices
    • B65H35/0073—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/02—Tearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/002—Materials or surface treatments therefor, e.g. composite materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/006—Cutting members therefor the cutting blade having a special shape, e.g. a special outline, serrations

Definitions

  • This invention relates generally to plastic cutting edges. More particularly, this invention relates to plastic cutting edges having cutting ribs and which are useful in conjunction with film dispensing containers, such as tape dispensers and cartons for aluminum foil or waxed paper.
  • Cutting edges are commonly used in conjunction with film dispensing containers to sever the dispensed film into useable lengths.
  • the container may be a carton containing a roll of film such as a roll of waxed paper, plastic food wrap or aluminum foil.
  • the carton is typically provided with a serrated metal cutting edge for tearing off usable lengths of film.
  • the container may also be a tape dispenser such as those used with transparent mending tapes found in homes and offices. These dispensers often include either a metal cutting edge that is separately attached to the dispenser or an integrally molded plastic cutting edge.
  • Some cutting edges can become dull with repeated use, thereby making it more difficult to easily sever film that is at the end of the roll. Sharpening the cutting edge is often impractical or even impossible if the cutting edge is permanently attached to the container. Thus, a cutting edge that can be easily replaced or that has a renewable cutting surface would be highly desired.
  • the cutting edge should be used with cartons that contain rolls of dispensable film, tape dispensers, and the like.
  • the utility of the cutting edge will be enhanced if it possesses certain attributes. For example, it should have a low profile to reduce the risk of injury by being cut. It should be useful with a wide variety of paper, plastic and metal films. It should be capable of being replaced after it has been attached to a container; or removed, given a renewed cutting surface, and reattached to the container. It should be recyclable. Finally, the cutting edge should be easy to manufacture.
  • the plastic cutting edges of the invention comprise a plastic web having first and second opposed major surfaces, and a plurality of separate, spaced apart, elongate plastic cutting ribs that are formed on at least one of (and optionally both of) the major surfaces of the web.
  • the ribs are substantially parallel to each other.
  • the ribs are distributed (i.e., aligned) longitudinally on the web and extend across the web (i.e., transverse to the longitudinal direction of the web).
  • the web also includes a longitudinally extending upper edge.
  • the ribs can terminate adjacent to the longitudinally extending upper edge of the web so as to form the cutting surface.
  • the ribs may comprise a root portion attached to the web and a beveled cutting tip (preferably at about 45°) that projects above the longitudinally extending upper edge of the web.
  • the cutting edge may further include a layer of adhesive (preferably a pressure sensitive adhesive) on one of the major surfaces of the web for attaching the cutting edge to a substrate.
  • a layer of adhesive preferably a pressure sensitive adhesive
  • Other techniques for attaching the cutting edge to a substrate include mechanical fasteners and ultrasonic welding.
  • the cutting edge may be attached to a container that retains a roll of a dispensable film such that sections of the dispensable film can be cut from the roll.
  • the cutting edges of the invention are particularly useful in conjunction with food wrap such as aluminum foil, waxed paper and clear plastic.
  • the invention relates to an elongated food wrap container that comprises an elongated carton having an open interior. An elongated roll of dispensable food wrap is retained within the interior of the carton, and a plastic cutting edge according to the invention is attached to the elongated carton for cutting sections of the dispensable food wrap from the roll.
  • a preferred location for attaching the cutting edge is the inside surface of the front wall of the carton and adjacent to the upper edge of the front wall.
  • the invention comprises a tape dispenser that includes a tape dispenser housing, a roll of dispensable tape mounted to the tape dispenser housing, and a plastic cutting edge according to the invention for cutting the tape.
  • the plastic cutting edge is attached to the tape dispenser housing.
  • the low profile, relatively flexible ribs provide a cutting surface that may reduce the likelihood of injury from use.
  • an adhesive e.g., by using a removable adhesive
  • the cutting edge may be removed and replaced with a new cutting edge, or the cutting edge can be given a renewed cutting surface and reattached. Because the cutting edge is formed of plastic, it may be readily recycled.
  • Cutting edge 10 comprises a web, backing or substrate 12 having a plurality of separate, spaced apart cutting ribs 14 formed on at least one of the web's first and second opposed major surfaces (i.e., surfaces 12a and 12b). Ribs 14 are distributed longitudinally on the web (i.e., they are aligned along the length of the web). Cutting edge 10 may also include an optional adhesive layer 16. As explained below, cutting edge 10 is useful for cutting dispensable films (especially consumer food wrap and adhesive tapes) into useable lengths.
  • the length of cutting edge 10 and web 12 depends on the application, the cutting edge and the web having a length that is generally equal to or somewhat greater than the width of the film that is to be cut.
  • Cutting edge 10 is typically elongated; that is, it has a length greater than its width. However, the length and the width of the cutting edge may be equal.
  • cutting edge 10 usually has a length of about 12 inches and a width of about 0.25 to 0.75 inch.
  • cutting edge 10 usually has a length of about 0.125 to 6 inches and a width of about 0.25 to 1 inch.
  • Web 12 may be formed from a wide variety of polymeric materials, especially those which are extrudable, thermally stable thermoplastics such as, for example, polyesters (e.g., polyethylene terephthalate and copolymers based on polyethylene terephthalate), polyolefins (e.g., polyethylene and polypropylene), polystyrene, polycarbonate, nylon, acrylics, acrylonitrile-butadiene-styrene, cellulose esters, copolymers that comprise alternating units of ethylene and tetrafluoroethylene, and blends and copolymers of the foregoing materials.
  • web 12 (as well as cutting edge 10) is sufficiently flexible that it can wound into a roll.
  • the web has a thickness of about 0.003 to 0.02 inch.
  • ribs 14 comprise a root or proximal end 18 attached to web 12, and a distal end or cutting tip 20 that projects above adjacent longitudinally extending upper edge 22 of web 12.
  • Ribs 14 are typically elongate structures that extend across web 12; that is, the ribs are transverse to the longitudinal axis of web 12. Ribs 14 usually form an angle of about 90° with the longitudinal axis of web 12, but may be oriented at a different angle, for example about 45° as shown in FIG. 4.
  • Ribs 14 may be formed from any polymeric material, preferably one which is an extrudable, thermally stable thermoplastic. Materials useful for forming web 12 may also be used to provide ribs 14. Preferably, the web and the ribs are formed of the same material, although this is not required. In addition, the polymeric material for web 12 and/or ribs 14 may be supplemented with various additives such as stabilizers, antioxidants, thixotropic agents, nucleating agents, flow control agents, colorants (e.g., titanium dioxide, carbon black), and fillers (e.g., calcium carbonate, abrasive grains, etc.).
  • additives such as stabilizers, antioxidants, thixotropic agents, nucleating agents, flow control agents, colorants (e.g., titanium dioxide, carbon black), and fillers (e.g., calcium carbonate, abrasive grains, etc.).
  • the thickness, the diameter, and the cross-sectional shape and dimensions of ribs 14 are determined by the shape of the die orifice opening, the relative die angle, the position or location of the orifice openings, the extruder flow rate (mass of extrudate as a function of time), the rate of draw on the extrudate, the rate of quenching of the extruded material as it leaves the die orifice, the stretch ratio if the extrudate is oriented, and the calendaring pressure if the extrudate is calendared. These parameters are all well known to those of ordinary skill in the extrusion art.
  • the ribs Before any optional orientation of the extrudate, the ribs typically have a substantially circular cross-sectional shape or an omega ( ⁇ ) shaped cross-section, depending upon the configuration of the die orifice openings.
  • the cross-sectional shape of the ribs is not so limited and other cross-sectional shapes are possible including squares, rectangles, triangles and bell shapes. If the extrudate is oriented (i.e., stretched) in the machine direction or calendared, the cross-sectional shape of the ribs often becomes distorted. For example, they may flatten or elongate.
  • the contact angles made by the ribs with respect to the major surface of the web to which they are attached may range from about 10° to 160°, more preferably from about 10° to 140°. At angles less than about 10°, it can become more difficult to manufacture the cutting edge with conventional extrusion equipment and commercially feasible operating speeds.
  • the mass of ribs projecting above the rib-bearing surface of the web must be sufficient to provide an effective contact with the film that is to be cut by the cutting edge. That is, the effectiveness of the cutting edge may be reduced if an insufficient mass of ribs projects from the web.
  • the ribs may be coextruded with the web (i.e., extruded at the same time) or extruded separately on to a hot or cold pre-formed web.
  • the ribs tend to fuse to the web and, upon doing so, a portion of the ribs flows into the spaces between each rib, thereby distorting the original cross-sectional shape (i.e., the shape immediately upon emerging from the extrusion die).
  • the original cross-sectional shape i.e., the shape immediately upon emerging from the extrusion die.
  • at least 30%, more preferably at least 80%, of the original cross-sectional mass of the ribs project from the rib-bearing surface of the web.
  • Ribs 14 are spaced apart so as to provide an alternating series of ribs 14 and lands or flat portions 24 on upper web surface 12a (the surface of web 12 from which ribs 14 project).
  • each rib is substantially identical to each other rib, and the rib-to-rib spacing is also substantially equal.
  • the ribs are also substantially parallel to each other.
  • the thickness "T” of ribs 14 is typically about 0.17 to 0.40 mm
  • the width "W” of the ribs is typically about 0.23 to 0.50 mm
  • the rib-to-rib spacing "S” is usually about 0.50 to 0.75 mm.
  • the number of ribs per linear inch distributed longitudinally on web 12 will be influenced by the nature of the dispensable film that is to be cut by cutting edge 10 and the fineness of the cut that is desired. It is preferred that there be about 10 to 30 ribs per linear inch of web, most preferably about 25 ribs per linear inch so as to provide a nominal rib center-to-rib center spacing "C" of about 1 mm.
  • each rib 14 preferably includes a distal end or cutting tip 20 that first contacts the film to be severed and initiates cutting of the film.
  • the distance that cutting tips 20 is selected to project above adjacent longitudinally extending upper edge 22 of web 12 will be influenced by the stiffness of the cutting tip and the nature of the dispensable film that is to be cut.
  • the height "H" of the cutting tip is typically about 0.14 to 0.25 mm in the most preferred embodiments.
  • the height of the cutting tip is influenced by the angle " ⁇ " of the cutting tip which, as best shown in FIG. 3, is preferably less than 90°, more preferably about 30° to 60°, and most preferably about 45°.
  • ⁇ the angle
  • the cutting tip may form a 90° angle, in which event rib 14 does not include a separate cutting tip that projects above adjacent longitudinally extending upper edge 22 of web 12.
  • ribs 14 terminate adjacent to longitudinally extending upper edge 22 of the web.
  • the cutting edge of FIG. 5 is useful with a film of limited extensibility such as aluminum foil.
  • Cutting edge 30 comprises a web, backing or substrate 32 which may be formed of the same materials that can be used to provide web 12, a plurality of separated, spaced apart ribs 34 distributed longitudinally on the web and which are similar to ribs 14. Cutting edge 30 may also include an optional adhesive layer 36.
  • the embodiment of FIG. 6 is similar to that shown in FIGS. 1 to 3 except that ribs 34 project from both major surfaces of web 32 (i.e., upper and lower surfaces 32a and 32b, respectively), rather than from only one major surface.
  • Cutting edges according to the invention are particularly useful for cutting a film into useable lengths.
  • “Film” refers to materials that are substantially longer and wider than they are thick and is used broadly to include paper films, non-woven films, plastic films and metals films. The films may be partially or completely coated on one or both surfaces so as to provide, for example, treated films, adhesive tapes, repositionable easel pad sheets and the like. Other uses include the cutting of pallet-wrapping films, facsimile transmission paper dispensed from a roll, and other sheet and roll goods.
  • FIGS. 7 to 9 One particularly preferred use for the cutting edges of the invention is shown in FIGS. 7 to 9 where the cutting edge is used in conjunction with a container or carton 40 that contains a film roll 42.
  • Film roll 42 may be a roll of waxed paper, clear plastic food wrap, aluminum foil, and the like.
  • Carton 40 is typically formed from a cardboard carton blank that is folded and glued into the desired shape. More specifically, carton 40 is elongated and comprises an elongated bottom wall 44 to which are connected an elongated front wall 46, side walls 48 and 50, and an elongated rear wall 52 that are joined together to form carton 40 having an open interior portion in which film roll 42 is received.
  • Film roll 42 is typically wound about a cardboard core 54.
  • Carton 40 conventionally further includes a cover 56 that comprises a top wall 58 and a closure flap 60 at the forward edge of the top wall.
  • Cover 56 is movable between an open position (as shown in FIGS. 7 and 8) and a closed position (not shown separately in the drawings) so as to enclose film roll 42 within carton 40, closure flap 60 being adjacent to the upper portion of front wall 46 in the closed position.
  • Cover 56 is adapted for such movement by being hinged to the upper edge of rear wall 52, the hinge connection being shown at 62.
  • Hinge connection 62 may be a continuous piano hinge, one or more individual mechanical hinges, or, most commonly, a crease or line of weakness formed in the cardboard carton.
  • a cutting edge according to the invention (which is illustrated in FIGS. 7 to 9 as cutting edge 10) is secured to any surface of carton 40 that permits a user to dispense film 42 and cut it into usable lengths by drawing the film against cutting ribs 14.
  • Cutting edge 10 may be secured to carton 40 by any convenient attachment means such as ultrasonic welding, mechanical fasteners (e.g., staples, clips, pins, rivets), or adhesives.
  • Adhesives are particularly preferred and any of a wide variety may be used to secure the cutting edge to the carton. Included among these are hot melt adhesives, solvent-coated adhesives, heat-activated adhesives, and solvent-activated adhesives. Pressure sensitive adhesives are most useful because they permit quick and easy attachment of the cutting edge to the carton.
  • useful pressure sensitive adhesives include acrylate adhesives, tackified natural rubber adhesives, tackified block copolymer adhesives, poly alpha-olefin adhesives, silicone adhesives, and the like.
  • the adhesive may be provided as a double sided adhesive tape.
  • Removable adhesives may be useful in providing a cutting edge that can be replaced or renewed.
  • FIGS. 7 to 9 show cutting edge 10 secured to an upper edge 64 of inside surface 66 of front wall 46 such that cutting tips 20 project above longitudinally extending front wall upper edge 64 for easy engagement with film 42 as it is being dispensed.
  • the cutting edge may be attached to other surfaces of carton 40.
  • it may be secured to the outer surface of the edge of bottom wall 44 that is adjacent to front wall 46 such that cutting tips 20 project forward of the front wall.
  • the cutting edge may also be secured to inside surface 68 of closure flap 60 and adjacent to the free end thereof such that cutting tips 20 extend beyond the longitudinally extending free edge of the closure flap.
  • a cutting edge may be used in conjunction with a tape dispenser 70.
  • Tape dispenser 70 comprises a housing 72 (typically formed of plastic) and a dispensable tape roll 74 rotatably mounted to the housing by a hub 76.
  • a cutting edge (illustrated in FIG. 11 as cutting edge 10) is secured to curved front wall 78 of the housing by a mechanical, adhesive or other fastener or by providing a slot in the housing in which the cutting edge is received.
  • the cutting edge may be removably attached to the tape dispenser housing.
  • tape roll 74 may be transparent mending tape, masking tape, autoclave tape, correction/cover up tape, and the like.
  • Cutting edges according to the invention may be readily prepared by coextrusion techniques.
  • the cutting edge may be produced using a dual manifold die to which is connected a pair of separate extruders.
  • the dual manifold die can include a slot orifice in the lower manifold for providing web 12 and a series of closely spaced orifices in the upper manifold for providing ribs 14.
  • Raw materials usually in the form of pellets, are melted by the extruders and delivered as two separate molten raw material streams to the dual manifold extrusion die. As the extrudates leave the dual manifold die in the molten state, they can be immediately combined to form a rib-bearing film.
  • the output ratio of the web-forming extruder to the rib-forming extruder is typically in the range of about 1:1 to 8:1, based on the weight of the materials.
  • the extruders may provide their molten raw materials streams to a single combining manifold die, the molten raw material streams being joined and extruded through a single die orifice that comprises a plurality of notches for forming the ribs and an elongated slot for forming the web.
  • the rib-bearing film leaves the die (whether dual manifold or single combining manifold type), it is typically drawn onto a chilled casting roll, good contact with the casting roll being facilitated through the use of an air knife or electrostatic pinning.
  • the rib-bearing film can be drawn through a nip formed by the chilled casting roll and a second casting roll that is run in the opposite direction.
  • the rib-bearing film may be oriented in the machine direction with a stretch ratio of up to 10:1.
  • the rib-bearing film may also be calendared by passing the film through one or more nips between metal rolls to reduce the caliper of the film. Calendaring can have the effect of changing the rib shape, for example, from a circular shape to an elliptical or trapezoidal shape and can also help to reduce the stiffness of the film, thereby rendering it more pliable.
  • An optional adhesive layer (so as to provide adhesive layer 16 or 36) may be applied to the rib-bearing film using techniques similar to those used to manufacture adhesive tape.
  • the rib-bearing film can be treated (e.g., corona-treated, primed, etc.) so as to improve the adhesion of the adhesive to the film.
  • the adhesive layer may be protected from dirt and other contaminants by laminating a release liner (e.g., a silicone or wax-treated paper or plastic film) thereto.
  • the rib-bearing surface of the film can be treated with a low adhesion backsize to permit the film to be wound into a roll. Techniques for manufacturing adhesive-coated, rib-bearing plastic films are described in more detail in U.S. Patent No. 5,173,141 (Leseman et al.).
  • the rib-bearing film comprises an essentially continuous web, sheet or membrane, and a plurality of separate, spaced apart, elongate ribs that extend in the machine or extrusion direction (i.e., parallel to the length of the essentially continuous film).
  • Cutting edges according to the invention are obtained from this rib-bearing film by slitting or cutting the same in the cross-film direction (typically perpendicular to the length of the film).
  • the elongate ribs are distributed longitudinally on the web (i.e., they are aligned along the length of the narrow strip web), but extend across the web (i.e., transverse to the longitudinal axis of the narrow strip web).
  • Cutting tips 20 are formed by bevel cutting the rib-bearing film at the desired angle.
  • the rib-bearing film can also be square cut (i.e., in a plane perpendicular to the plane of the film) so as to provide the embodiment shown in FIG. 5.
  • the cutting edge may then be applied to a container such as carton 40 by laminating a cutting edge that includes an adhesive layer to the desired surface of the carton.
  • a cutting edge that does not include an adhesive can be mechanically attached or ultrasonically welded.
  • an incoming, essentially continuous rib-bearing film can be laminated to a carton blank (i.e., a flat piece of cardboard that has been cut for the carton but which has not yet been folded into shape) and then bevel cut in the cross-film direction so as to provide a cutting edge having beveled or angled cutting tips.
  • a carton blank i.e., a flat piece of cardboard that has been cut for the carton but which has not yet been folded into shape
  • a series of plastic cutting edges with cutting ribs according to the invention was prepared by a coextrusion process using a dual manifold die. Both the ribs and the web were formed from virgin polypropylene resin (from FINA, Cosden Chemical Division).
  • resin for the web was supplied by a 3.5 inch diameter extruder operating at 500° F and 47.5 revolutions per minute (RPM), while resin for the ribs was supplied by a 2 inch diameter extruder operating at 525° F and a rate specified in Table 1 below.
  • the molten polypropylene resin streams from the two extruders were supplied to a dual manifold die.
  • the upper die was 32 inches wide and included 25 rib-forming circular orifices per linear inch, the orifices being spaced 0.040 inch on center and having a diameter of about 0.013 inch.
  • the lower, web-forming orifice was a 35 inch wide, 0.025 inch high slot.
  • the ribs and web were combined upon exiting from the dual manifold die and were drawn from the die with the aid of a casting wheel maintained at a temperature of 110° F.
  • the speed of the casting wheel is specified in Table 1 below.
  • Several of the examples were oriented in the machine direction, as noted in Table 1 below, where the reported ratio is the orientation in the machine direction (MD) to the orientation in the cross-film direction (CD).
  • Examples 7 to 9 were calendared by passing the rib-bearing film between a pair of nip rollers.
  • the thickness of the resulting film (web and ribs) was 0.0083 inch for example 7, 0.0071 inch for example 8, and 0.0066 inch for example 9.
  • the web surface not bearing ribs was corona-treated to at least 38 dynes/cm and was then coated with a tackified thermoplastic elastomer block copolymer hot melt pressure sensitive adhesive.
  • a silicone release material-coated paper release liner was then laminated to the adhesive layer to protect the same.
  • a plastic cutting edge according to the invention was prepared by taking the rib-bearing film from example 6 and diagonally square cutting the same.
  • the cutting edge was attached to a box of W41 brand aluminum foil, so as to have the configuration shown in FIG. 10.
  • the cutting edge of example 10 was able to cut aluminum foil.
  • a series of three plastic cutting edges according to the invention was prepared using extrusion grade polycarbonate (from General Electric Company, Schenectady, NY) and a copolymer based on polyethylene terephthlate (EASTAR PETG copolyester 6763 from Eastman Chemical Company, Kingsport, TN) for the web and/or the ribs as specified below in Table 2 where "PC" is polycarbonate.
  • extrusion grade polycarbonate from General Electric Company, Schenectady, NY
  • EASTAR PETG copolyester 6763 from Eastman Chemical Company, Kingsport, TN
  • a 1.75 inch diameter extruder operating at 25 RPM was used to provide a molten raw material stream for the web.
  • the web extruder was maintained at 480° F for examples 11 and 13 and at 550° F for example 12.
  • a 1.25 inch diameter extruder operating at 37 RPM was used to provide a molten raw material stream for the ribs.
  • the rib extruder was maintained at 550° F for examples 11 and 12 and at 480° F for example 13.
  • the two molten raw material steams were supplied to a dual manifold die.
  • the upper die was 12 inches wide and included 14 rib-forming circular orifices per linear inch, the orifices being spaced 0.060 inch on center and having a diameter of about 0.020 inch.
  • the lower, web-forming orifice was a 12 inch wide, 0.020 inch high slot.
  • the ribs and web were combined upon exiting from the dual manifold die and were drawn from the die with the aid of a casting wheel running at 8 feet/minute and maintained at a temperature of 70° F.
  • the examples were neither oriented nor calendared.
  • the rib-bearing films were then diagonally bevel cut to have the configuration shown in FIG. 4 (ribs oriented at 45° with respect to the longitudinal axis of the web and with a 45° beveled cutting tip).
  • the cutting edges of the invention offer many unique advantages.
  • the low profile, relatively flexible (as compared to metal), cutting ribs provide a cutting surface that may reduce the likelihood of injury from use.
  • a laminating adhesive e.g., by using a removable adhesive
  • the cutting edge may be removed from an article to which it has been applied and replaced with a new cutting edge.
  • a cutting edge that has become dull with use can be replaced.
  • the cutting edge could be removed from the container and renewed by cutting the edge in the longitudinal direction with, for example, a conventional, single arm table top paper cutter. Because the cutting edge is formed of plastic, it may be readily recycled.

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EP19960118599 1995-11-29 1996-11-20 Arête de coupe en plastique avec nervures coupantes Withdrawn EP0776848A2 (fr)

Applications Claiming Priority (2)

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US56440695A 1995-11-29 1995-11-29
US564406 1995-11-29

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EP0776848A2 true EP0776848A2 (fr) 1997-06-04

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
WO2000015729A1 (fr) * 1998-09-16 2000-03-23 Linear Products Inc. Bande en polymere utilisee pour former un bord coupant sur des distributeurs en carton
US6858105B2 (en) 2000-11-01 2005-02-22 Adalis Corporation Splicing system affording a continuous web material supply for an applicator
US7005028B2 (en) 2000-11-01 2006-02-28 Adalis Corporation Web material advance system for web material applicator
WO2006130674A2 (fr) * 2005-06-01 2006-12-07 International Rectifier Corporation Support de bande pelable
US7172666B2 (en) 2002-12-17 2007-02-06 Groves Matthew E Web material application methods and systems
JP2021109269A (ja) * 2020-01-08 2021-08-02 まさみ 黒田 フィルムカッター

Citations (1)

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Publication number Priority date Publication date Assignee Title
US5173141A (en) 1988-05-25 1992-12-22 Minnesota Mining And Manufacturing Company Preparing tape having improved tear strength

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5173141A (en) 1988-05-25 1992-12-22 Minnesota Mining And Manufacturing Company Preparing tape having improved tear strength

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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WO2000015729A1 (fr) * 1998-09-16 2000-03-23 Linear Products Inc. Bande en polymere utilisee pour former un bord coupant sur des distributeurs en carton
US6858105B2 (en) 2000-11-01 2005-02-22 Adalis Corporation Splicing system affording a continuous web material supply for an applicator
US6860309B2 (en) 2000-11-01 2005-03-01 Adalis Corporation Splicing system affording a continuous web material supply for an applicator
US6893528B2 (en) 2000-11-01 2005-05-17 Adalis Corporation Web material advance system for web material applicator
US7005028B2 (en) 2000-11-01 2006-02-28 Adalis Corporation Web material advance system for web material applicator
US7135083B2 (en) 2000-11-01 2006-11-14 Adalis Corporation Web material advance system for web material applicator
US7172666B2 (en) 2002-12-17 2007-02-06 Groves Matthew E Web material application methods and systems
WO2006130674A2 (fr) * 2005-06-01 2006-12-07 International Rectifier Corporation Support de bande pelable
WO2006130674A3 (fr) * 2005-06-01 2007-06-14 Int Rectifier Corp Support de bande pelable
JP2008543088A (ja) * 2005-06-01 2008-11-27 インターナショナル レクティファイアー コーポレイション 剥離テープキャリア
US8173245B2 (en) 2005-06-01 2012-05-08 International Rectifier Corporation Peelable tape carrier
JP2021109269A (ja) * 2020-01-08 2021-08-02 まさみ 黒田 フィルムカッター

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