EP1916076B1 - Beschichtung für Papierschneidegeräte - Google Patents

Beschichtung für Papierschneidegeräte Download PDF

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Publication number
EP1916076B1
EP1916076B1 EP08000011A EP08000011A EP1916076B1 EP 1916076 B1 EP1916076 B1 EP 1916076B1 EP 08000011 A EP08000011 A EP 08000011A EP 08000011 A EP08000011 A EP 08000011A EP 1916076 B1 EP1916076 B1 EP 1916076B1
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EP
European Patent Office
Prior art keywords
coating
cutting
blades
pair
weight
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.)
Expired - Lifetime
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EP08000011A
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English (en)
French (fr)
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EP1916076A1 (de
Inventor
Larry Buchtmann
Gary Pia
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Acme United Corp
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Acme United Corp
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Publication date
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Priority claimed from EP02782295A external-priority patent/EP1453642B1/de
Publication of EP1916076A1 publication Critical patent/EP1916076A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B13/00—Hand shears; Scissors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B25/00—Hand cutting tools involving disc blades, e.g. motor-driven
    • B26B25/005—Manually operated, e.g. pizza cutters
    • B26B25/007—Operable only in combination with guiding means, e.g. paper cutters
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
    • 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
    • B26D1/01—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 involving a cutting member which does not travel with the work
    • B26D1/04—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 involving a cutting member which does not travel with the work having a linearly-movable cutting member
    • B26D1/045—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 involving a cutting member which does not travel with the work having a linearly-movable cutting member for thin material, e.g. for sheets, strips or the like
    • 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
    • B26D1/01—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 involving a cutting member which does not travel with the work
    • B26D1/12—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 involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/14—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 involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter
    • B26D1/157—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 involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter rotating about a movable axis
    • B26D1/18—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 involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter rotating about a movable axis mounted on a movable carriage
    • B26D1/185—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 involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter rotating about a movable axis mounted on a movable carriage for thin material, e.g. for sheets, strips or the like
    • 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
    • B26D1/01—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 involving a cutting member which does not travel with the work
    • B26D1/12—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 involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/14—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 involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter
    • B26D1/20—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 involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter coacting with a fixed member
    • B26D1/205—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 involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter coacting with a fixed member for thin material, e.g. for sheets, strips or the like
    • 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
    • B26D1/01—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 involving a cutting member which does not travel with the work
    • B26D1/12—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 involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/25—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 involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
    • B26D1/26—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 involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut
    • B26D1/30—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 involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut with limited pivotal movement to effect cut
    • 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

Definitions

  • the present invention is related to stationery cutting implements such as scissors, shears, guillotine style paper trimmers, and rotary style paper trimmers. More particularly, the present invention is related to a coating for such cutting implements.
  • Wear resistant coatings are known, for example, U.S. Patent No. 5152774 teaches a method for making surgical instruments having a wear-resistant coating that contains titanium nitride.
  • a cutting implement comprising a pair of cutting blades and a coating.
  • the coating comprises titanium chromium nitride, which provides the cutting blades with a satin silver appearance.
  • a cutting implement having a pair of complementary cutting blades and a titanium chromium nitride coating is also provided.
  • the titanium chromium nitride coating is disposed on each of the cutting blades.
  • the titanium chromium nitride coating has a thickness in a range between about 0.3 and 0.5 micrometer, a surface roughness in a range of about 15 to 25 10-6 mm/mm (inch/inch), and a hardness in a range of about 5.7 to about 9.1 gigapascals.
  • Figure 1 is a first side view of an exemplary embodiment of a pair of scissors
  • Figure 2 is a second, opposite side view of Figure 1 ;
  • Figures 3 and 4 are side views of the blades of Figure 1 ;
  • Figure 5 is a data table of testing results of various exemplary embodiments of a coating of the present invention for the scissors of Figure 1 ;
  • Figure 6 is a perspective view of an exemplary embodiment of a rotary style paper trimmer
  • Figure 7 is a sectional view along line 7-7 of Figure 6 ;
  • Figure 8 is a perspective view of an exemplary embodiment of a guillotine style paper trimmer.
  • Figure 9 is a side view of the guillotine style paper trimmer of Figure 8 .
  • Scissors 10 have a first half 12 pivotally connected to a second half 14.
  • First and second halves 12,14 are pivotally connected by conventional connection means, such as a screw 16 and a post 18.
  • First half 12 can have a handle 20 and a blade 22.
  • second half 14 can have a handle 24 and a blade 26.
  • Each blade 22,26 has a cutting edge 28.
  • cutting edge 28 is formed by way of a bevel 30 disposed on each blade 22,26, respectively.
  • scissors 10 provide a pair of complementary cutting blades 22,26 for cutting stationery products, such as paper, cardboard, bristol board, and others.
  • Handles 20,24 are preferably overmolded onto blades 22,26, respectively.
  • each half 12,14 of scissors 10 is described as having separate handles 20,24 overmolded onto blades 22,26, respectively.
  • each half 12,14 have a unitary handle and blade portion.
  • Blade 22 is illustrated in Figure 3
  • blade 26 is illustrated in Figure 4
  • Blades 22,26 are preferably made of steel, more preferably stainless steel, such as 420 stainless steel.
  • blades 22,26 can be heat-treated to further increase the hardness of the blades.
  • Scissors 10 further include a coating 32 disposed on each blade 22, 26.
  • Coating 32 provides cutting edges 28 with extremely tough, hard, wear resistant characteristics. The increased hardness of cutting edges 28 provides scissors 10 with substantially increased longevity, while also providing the scissors with corrosion resistance, as well as providing a smooth and uniform appearance and color. For example, scissors 10 having coating 32 were subjected to cycle testing of 10,000 openings and closing without showing any signs of wear to the coating.
  • coating 32 provides scissors 10 with an aesthetically acceptable color or appearance. Specifically, coating 32 differentiates blades 22,26 having coating 32 from uncoated blades. Coating 32 does not change the color of blades 22,26 to the point that the consumer no longer recognizes scissors 10 as being useable for general household and office use. However, coating 32 has an appearance sufficient to allow the consumer to recognize that the coating is present on scissors 10.
  • coating 32 increases the ease of use of scissors 10 by providing blades 22,26 with a smooth surface finish, which reduces friction between the blades during use.
  • blades 22,26 have less friction between the two inside blade faces, which provides a smoother cutting action and less cutting effort than in coated blades without coating 32.
  • Coating 32 is selected from the group consisting of titanium nitride (TiN), chromium nitride (CrN), and titanium chromium nitride (TiCrN). More preferably, coating 32 is a multiple component barrier of titanium chromium nitride.
  • Coating 32 is disposed on blades 22,26 such that the coating forms a metallurgical bond with the blades, which resists flaking, blistering, chipping, and peeling. In fact, coating 32 is adsorbed into the surface layer of the metal of blades 22,26. Coating 32 is disposed on blades 22,26 with a thickness in a range between about 0.3 and 0.5 microns, more preferably about 0.4 microns.
  • Figure 5 illustrates the test results for a range of compositions and processes for coating 32.
  • Sample 1 is a control or uncoated blade formed of heat-treated 420 stainless steel. Heat-treated 420 stainless steel blades were also used in Samples 2 though 10.
  • the concentration of coating 32 in all samples were tested and were in the range of about +/-3 to 4 percent of the target composition. The testing also showed that both the elements are uniformly deposited and there is no segregation or isolation of each to any particular region in the film.
  • the first process was a reactive magnetron sputtering with a pulsed dc source.
  • the second process comprised a cathode arc plasma (CAP) process.
  • the sputtering gas mixture in each process was argon and nitrogen.
  • a 10,2 cm (four-inch) circular target is used with a pulsed dc power supply.
  • the target was a combination target having one or more 90-degree sections of pure titanium and chromium.
  • the target is three 90-degree sections of pure titanium and one 90-degree section of pure chromium.
  • each target being pure titanium and chromium.
  • the partial pressure of argon during the first process was maintained between 0 to 1 millitorr and that of nitrogen was maintained at 1 to 2 millitorr with the total sputtering gas pressure maintained between 2 to 3 millitorr.
  • the stainless steel chamber was evacuated to 2x10-5 Torr prior to the deposition. Cleaning of the target was carried with argon alone.
  • the sputtering current was kept at 0.3 amps during cleaning that was carried out for 3 minutes in all depositions. Deposition of the films on the blades during cleaning was prevented by a shutter that was withdrawn soon after cleaning the target.
  • the sputtering current was chosen at two different values, 0.5 amperes and 0.7 amperes.
  • Depositions were performed for two different total sputtering times, 15 minutes and 30 minutes.
  • the resulting thickness of the films was found to be 0.3 micrometers and 0.6 micrometers, respectively.
  • the deposition temperature has been optimized for the following conditions. Stainless steel scissors blades should not soften and therefore deposition temperature was kept at a temperature of about 150 ° and 200 °C.
  • the hardness of the samples was measured using a Vickers microhardness test according to American Society of Testing and Materials (ASTM) E384, last revised March 2001.
  • a diamond indenter is loaded to a desired amount, which causes the indenter to indent the sample.
  • the indentation is measured and converted to a hardness value.
  • the indenter is a three-sided, pyramid-shaped diamond probe tip with angle of 136 °.
  • the hardness values of Figure 5 represent the hardness of each sample with load of about 50 grams, with a load of about 400 grams for the uncoated sample 1.
  • the results of Figure 5 show that the coated samples (samples 2 to 10) are generally harder than the uncoated sample (sample 1). For example, sample 4 is about 125% harder than sample 1. Further, the results of Figure 5 show that the hardness of the coated samples (samples 2 to 10) generally tends to increase as the content of chromium increases.
  • the samples having a majority of chromium (e. g. , samples 6 and 10) had a gloss silver appearance, which was substantially similar to that of uncoated sample 1. In fact, it has been determined that consumers did not recognized that the scissors having a gloss silver appearance (e. g. , the samples having a majority of chromium) had any coating at all.
  • the samples having a majority of titanium had a satin gold appearance.
  • consumers recognized scissors having a satin gold appearance e. g., the samples having a majority of titanium
  • these scissors appear to the consumer to be specialty scissors.
  • the samples having a more balanced amount of titanium to chromium had a satin silver appearance.
  • consumers recognized scissors 10 having a satin silver appearance as being for general household use and as having a coating.
  • Chromium is typically about 2.5 times more expensive than titanium. Thus, forming coating 32 of a majority of chromium leads to a substantial increase in cost, with only minimal gains in hardness. For example, coating 32 having 75% chromium and 25% titanium is about 95% as hard as a coating of 100% chromium.
  • the chromium nitride forms a strong bond to the blade, but does not form a strong bond with itself.
  • chromium nitride can form a strong bond with the chromium oxide of blade 22,26, but does not form a strong bond with other chromium nitride molecules.
  • the samples having a majority of chromium exhibited a higher tendency to peel than other samples having a minority of chromium.
  • the diffusion barrier properties exhibited by the samples having a majority of titanium were superior to those having less titanium. Thus, the samples having a majority of titanium exhibited better stain and corrosion resistance than other samples having a minority of titanium.
  • Coating 32 having the desired hardness, smoothness, and diffusion barrier properties preferably is formed of titanium chromium nitride having about 35 percent by weight of titanium nitride and about 65 percent by weight of chromium nitride and with a hardness in a range of about 5.7 to about 9.1 gigapascals. More preferably, coating 32 has about 50 percent by weight of titanium nitride and about 50 percent by weight of chromium nitride and a hardness in a range of about 7.2 to about 7.6 gigapascals.
  • coating 32 having the aforementioned ratios of chromium nitride and titanium nitride provided scissors 10 with a visual indication that the coating had been applied, without affecting the consumer's impression of the target use of the scissors (i. e. , general household use). Moreover, coating 32 having the aforementioned ratios of chromium nitride and titanium nitride provided scissors 10 with drastically improved hardness over the uncoated sample 1.
  • the surface roughness of blades 22,26 before and after the application of coating 32 was also measured.
  • the surface roughness of the outside surface of blades 22,26 before coating 32 was in a range of about 20 to 25 10-6 mm/mm (inch/inch), but was reduced to about 15 to 20 10-6 mm/mm (inch/inch) after the coating was applied.
  • the surface roughness of the inside surface of blades 22,26 before coating 32 was about 25 to 30 10-6 mm/mm (inch/inch), but was reduced to about 20 to 25 10-6 mm/mm (inch/inch) after the coating was applied. It is believed that the roughness of blades 22,26 was reduced because the molecules of coating 32 predominantly bond with the valleys and indentations in the blades.
  • scissors 10 are described above by way of example only as having a coating applied by reactive magnetron sputtering and CAP processes. Any thin film forming method such as chemical vapor deposition, physical vapor deposition, thermal spraying and sintering after a dip coating may be employed for providing coating 32 to scissors 10.
  • the method of forming coating 32 has a maximum temperature sufficient to not soften or affect the heat- treatment of the uncoated blades.
  • coating 32 has been described above by way of example only as finding use with a cutting implement in the form of scissors 10.
  • coating 32 can provide the aforementioned benefits to other stationery cutting implements.
  • Figures 6 to 9 illustrate alternate exemplary embodiments of cutting implements, which have a coating.
  • Rotary style paper trimmer 110 is as shown and described in U. S. Provisional Application Serial No. 60/421,581 filed on October 28,2002 .
  • Trimmer 110 has a base 112 and a rotary cutting mechanism 114.
  • Base 112 has a rail 116 and a cutting blade or anvil 118.
  • Rotary cutting mechanism 114 has a circular cutting blade 120 disposed in a housing 122. Housing 122 is slideably received on rail 116.
  • Blade 120 is disposed in housing 122 opposite blade 118 as illustrated in Figure 7 .
  • Blade 120 has a cutting edge 124 formed at its outer periphery, while blade 118 has a corresponding cutting edge 126.
  • Rotary cutting mechanism 114 is also movably received on rail 116 such that cutting edges 124,126 can be moved into contact with one another. Accordingly, trimmer 110 has a pair of complementary cutting blades 118, 120.
  • a piece of paper 128 is positioned between cutting edges 124,126.
  • Rotary cutting mechanism 114 is moved such that cutting edge 124 is contact with cutting edge 126. Then, rotary cutting mechanism 114 is slid along rail 116 such that the interaction of cutting edge 124 on cutting edge 126 severs paper 128 disposed therebetween.
  • Blades 118, 120 are preferably made of steel, more preferably stainless steel, such as 420 stainless steel. In addition, blades 118,120 can be heat-treated to further increase the hardness of the complementary cutting blades.
  • Trimmer 110 has a coating 132 disposed on blades 118,120. As described in detail above with respect to the exemplary embodiments of Figures 1 to 5 , coating 132 has a thickness in a range between about 0.3 microns and 0.5 microns, more preferably about 0.4 microns.
  • Coating 132 provides the complementary cutting blades 118,120 with extremely tough, hard, wear resistant characteristics. This increased hardness provides trimmer 110 with substantially increased longevity, while also providing the trimmer with corrosion resistance, as well as providing a smooth and uniform appearance and color. Coating 132 provides trimmer 110 with an aesthetically acceptable color or appearance and reduces friction between the cutting blades during use.
  • Coating 132 can be made of titanium nitride (TiN), chromium nitride (CrN), or titanium chromium nitride (TiCrN). More preferably, coating 32 is a multiple component barrier of titanium chromium nitride.
  • Coating 132 having the desired hardness, smoothness, and diffusion barrier properties preferably is formed of titanium chromium nitride having about 35 percent by weight of titanium nitride and about 65 percent by weight of chromium nitride and with a hardness in a range of about 5.7 to about 9.1 gigapascals. More preferably, coating 32 has about 50 percent by weight of titanium nitride and about 50 percent by weight of chromium nitride and a hardness in a range of about 7.2 to about 7.6 gigapascals.
  • coating 132 provides trimmer 110 with a visual indication that the coating had been applied, without affecting the consumer's impression of the target use of the scissors (i. e., general household use). Moreover, coating 132 provides trimmer 110 with drastically improved hardness over the uncoated trimmers.
  • FIG. 8 and 9 An exemplary embodiment of a stationery cutting implement in the form of a guillotine style paper trimmer 210 is illustrated in Figures 8 and 9 .
  • Trimmer 210 is as shown and described in U. S. Provisional Application Serial No. 60/392,942 filed on July 1,2002 .
  • Trimmer 210 has a base 212 and a pivoting cutting mechanism 214.
  • Base 212 has a fixed cutting blade 216.
  • Pivoting cutting mechanism 214 has a movable cutting blade 220 pivotally secured to base 212 at a pivot point 218.
  • Each blade 216,220 has a cutting edge 224. Accordingly, trimmer 210 has a pair of complementary cutting blades 216,220.
  • a piece of paper (not shown) is positioned on base 212 so that the portion to be cut is disposed between the cutting edges 224. Pivoting cutting mechanism 214 is moved about pivot point 218 in the direction of arrow 226 such that the cutting edges 224 shear the paper.
  • Cutting blades 216,220 are preferably made of steel, more preferably stainless steel, such as 420 stainless steel. In addition, cutting blades 216,220 can be heat-treated to further increase the hardness of the complementary cutting blades.
  • Trimmer 210 has a coating 232 disposed on cutting blades 216,220. Again, coating 232 has a thickness in a range between about 0.3 microns and 0.5 microns, more preferably about 0.4 microns.
  • Coating 232 like coating 132, provides the complementary cutting blades with extremely tough, hard, wear resistant characteristics. This increased hardness provides trimmer 210 with substantially increased longevity, while also providing the trimmer with corrosion resistance, as well as providing a smooth and uniform appearance and color. Coating 232 provides trimmer 210 with an aesthetically acceptable color or appearance and reduces friction between the cutting blades during use.
  • Coating 232 can be made of titanium nitride (TiN), chromium nitride (CrN), or titanium chromium nitride (TiCrN). More preferably, coating 232 is a multiple component barrier of titanium chromium nitride. Coating 232 is formed of titanium chromium nitride having about 35 percent by weight of titanium nitride and about 65 percent by weight of chromium nitride and with a hardness in a range of about 5.7 to about 9.1 gigapascals. More preferably, coating 232 has about 50 percent by weight of titanium nitride and about 50 percent by weight of chromium nitride and a hardness in a range of about 7.2 to about 7.6 gigapascals.
  • the coating described herein for stationery cutting implements provides a cost competitive manner to improve the hardness, longevity, stain resistance, and ease of use of the cutting implement. For example, it has been found that the coating of the present invention, when applied using the aforementioned CAP process, increases the cost of the cutting implement by about seventeen cents, or less than 30% of the cost of manufacture the implement.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Scissors And Nippers (AREA)
  • Physical Vapour Deposition (AREA)

Claims (14)

  1. Schneidewerkzeug (10), umfassend:
    ein Paar komplementärer Schneidklingen (22, 26), die jeweils eine Schneidkante (28) aufweisen, dadurch gekennzeichnet, dass
    jede des Paares komplementärer Schneidklingen (22, 26) eine darauf angeordnete Beschichtung aufweist, wobei die Beschichtung etwa 25 Gew.-% Titannitrid und etwa 75 Gew.-% Chromnitrid aufweist.
  2. Schneidewerkzeug nach Anspruch 1, wobei die Beschichtung den Schneidklingen (22, 26) ein seidig-silbriges Aussehen verleiht.
  3. Schneidewerkzeug (10) umfassend:
    ein Paar komplementärer Schneidklingen (22, 26), die jeweils eine Schneidkante (28) aufweisen, dadurch gekennzeichnet, dass
    jede des Paares komplementärer Schneidklingen (22, 26) eine darauf angeordnete Beschichtung aufweist, wobei die Beschichtung etwa 75 Gew.-% Titannitrid und etwa 25 Gew.-% Chromnitrid aufweist.
  4. Schneidewerkzeug (10), umfassend:
    ein Paar komplementärer Schneidklingen (22, 26), die jeweils eine Schneidkante (28) aufweisen, dadurch gekennzeichnet, dass
    jede des Paares komplementärer Schneidklingen (22, 26) eine darauf angeordnete Beschichtung aufweist, wobei die Beschichtung etwa 60 Gew.-% Titannitrid und etwa 40 Gew.-% Chromnitrid aufweist.
  5. Schneidewerkzeug (10), umfassend:
    ein Paar komplementärer Schneidklingen (22, 26), die jeweils eine Schneidkante (28) aufweisen, dadurch gekennzeichnet, dass
    jede des Paares komplementärer Schneidklingen (22, 26) eine darauf angeordnete Beschichtung aufweist, wobei die Beschichtung etwa 10 Gew.-% Titannitrid und etwa 90 Gew.-% Chromnitrid aufweist.
  6. Schneidewerkzeug (10), umfassend:
    ein Paar komplementärer Schneidklingen (22, 26), die jeweils eine Schneidkante (28) aufweisen, dadurch gekennzeichnet, dass
    jede des Paares komplementärer Schneidklingen (22, 26) eine darauf angeordnete Beschichtung aufweist, wobei die Beschichtung etwa 90 Gew.-% Titannitrid und etwa 10 Gew.-% Chromnitrid aufweist.
  7. Schneidewerkzeug nach einem der Ansprüche 3, 4 oder 6, wobei die Beschichtung den Schneidklingen (22, 26) ein seidig-goldenes Aussehen verleiht.
  8. Schneidewerkzeug nach Anspruch 5, wobei die Beschichtung den Schneidklingen (22, 26) ein silbernes Aussehen mit mittlerem Glanz verleiht.
  9. Schneidewerkzeug nach einem der vorangehenden Ansprüche, wobei die Beschichtung mittels eines Verfahrens ausgewählt aus chemische Gasphasenabscheidung, physikalische Gasphasenabscheidung, reaktives Magnetron-Sputtern, und Kathoden-Lichtbogen-Abscheidung auf die Schneidklingen (22, 26) aufgebracht wird.
  10. Schneidewerkzeug nach einem der vorangehenden Ansprüche, wobei das Schneidwerkzeug (10) ausgewählt ist aus einer Gruppe bestehend aus einer Schere, einem Papiertrimmer vom Rollentyp, und einem Papiertrimmer vom Hebeltyp.
  11. Schneidewerkzeug nach einem der vorangehenden Ansprüche, wobei die Beschichtung eine Dicke im Bereich von 0,3 bis 0,5 Mikrometer aufweist.
  12. Schneidewerkzeug nach einem der vorangehenden Ansprüche, wobei die Schneidklingen (22, 26) aus einem Material ausgebildet sind ausgewählt aus der Gruppe bestehend aus Stahl, rostfreiem Stahl, 420er rostfreiem Stahl, wärmebehandeltem Stahl, wärmebehandeltem rostfreiem Stahl und wärmebehandelten 420er rostfreiem Stahl.
  13. Schneidewerkzeug nach einem der vorangehenden Ansprüche, wobei die Beschichtung auf den Schneidklingen (22, 26) derart angeordnet ist, dass die Beschichtung eine metallurgische Bindung mit den Klingen eingeht, wobei die metallurgische Bindung mindestens Abblättern, Blasenbildung, Abplatzen oder Ablösen widersteht.
  14. Schneidewerkzeug nach einem der vorangehenden Ansprüche, wobei die Beschichtung in einer Oberflächenschicht jeder der Schneidklingen (22, 26) adsorbiert ist.
EP08000011A 2001-11-13 2002-11-13 Beschichtung für Papierschneidegeräte Expired - Lifetime EP1916076B1 (de)

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US20150128423A1 (en) * 2013-11-08 2015-05-14 BNR Development, LLC Scissors apparatus for special snipping

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BR8108987A (pt) * 1981-03-02 1983-03-01 Vni Instrument Inst Revestimento de ferramentas para corte de metal
DE3447962A1 (de) * 1984-03-30 1985-11-21 Fritz Bracht GmbH & Co KG, 5650 Solingen Einhandschere aus metall, insbesondere friseurschere
US5152774A (en) * 1988-10-17 1992-10-06 Schroeder William A Surgical instrument having a toughened wearing surface and method of making the same
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