US20100282811A1 - Cutting edge for packaging container and packaging container having the same - Google Patents

Cutting edge for packaging container and packaging container having the same Download PDF

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Publication number
US20100282811A1
US20100282811A1 US12/679,737 US67973708A US2010282811A1 US 20100282811 A1 US20100282811 A1 US 20100282811A1 US 67973708 A US67973708 A US 67973708A US 2010282811 A1 US2010282811 A1 US 2010282811A1
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US
United States
Prior art keywords
teeth
cutting edge
straight line
wrap film
packaging container
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.)
Abandoned
Application number
US12/679,737
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English (en)
Inventor
Michihiro Sato
Yoshikazu Amano
Makoto Unno
Shinichi Sekine
Kenichi Ishi
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.)
Kureha Corp
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Kureha Corp
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Filing date
Publication date
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Assigned to KUREHA CORPORATION reassignment KUREHA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SEKINE, SHINICHI, UNNO, MAKOTO, AMANO, YOSHIKAZU, SATO, MICHIHIRO
Publication of US20100282811A1 publication Critical patent/US20100282811A1/en
Assigned to KUREHA CORPORATION reassignment KUREHA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISHII, KENICHI
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/08—Containers or packages with special means for dispensing contents for dispensing thin flat articles in succession
    • B65D83/0805—Containers or packages with special means for dispensing contents for dispensing thin flat articles in succession through an aperture in a wall
    • B65D83/0811—Containers or packages with special means for dispensing contents for dispensing thin flat articles in succession through an aperture in a wall with means for assisting dispensing
    • B65D83/0841—Containers or packages with special means for dispensing contents for dispensing thin flat articles in succession through an aperture in a wall with means for assisting dispensing and for cutting interconnected articles
    • 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
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/67—Containers, packaging elements or packages, specially adapted for particular articles or materials for web or tape-like material
    • B65D85/671—Containers, packaging elements or packages, specially adapted for particular articles or materials for web or tape-like material wound in flat spiral form
    • B65D85/672—Containers, packaging elements or packages, specially adapted for particular articles or materials for web or tape-like material wound in flat spiral form on cores
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T225/00—Severing by tearing or breaking
    • Y10T225/20—Severing by manually forcing against fixed edge
    • Y10T225/298—Blades or severing devices

Definitions

  • the present invention relates to a packaging container which accommodates a wrap film rolled around a cylindrical core, and to a cutting edge used for the packaging container.
  • the cutting edge is usually made of metal from the viewpoint of cutting power and durability, but in recent years non-metal materials such as paper or resins have been studied in consideration of environmental problems and user safety.
  • Such non-metal cutting edges do not readily exhibit the same satisfactory cutting power as metal cutting edges, and since a large force is required to cut highly elastic wrap films such as polyethylene, polypropylene or polyvinylidene chloride, improvement in the cutting power has been desired.
  • Cutting edge forms have been proposed as solutions.
  • straight-line cutting edges that have been proposed include those wherein the tips on both ends of the cutting edge are directed outward to facilitate penetration of the teeth into the wrap film (Patent documents 1 and 2, for example), those with a V-shaped cutting edge, wherein the center of the cutting edge is nearer the base of the container than the sides and larger teeth are arranged at the apex of the V-shape to facilitate penetration of the teeth into the wrap film at the initial cutting (Patent documents 3 and 4, for example), and those with an inverse V-shaped cutting edge that is the reverse of the aforementioned V-shape, wherein the side areas of the cutting edge protrude more than the center and the teeth at both ends have outwardly directed tips (Patent document 5, for example).
  • the method in which a wrap film is cut with a cutting edge provided on a packaging container generally differs depending on the shape of the cutting edge.
  • a V-shaped cutting edge for example, the wrap film housed in the packaging container is drawn out, a desired amount of the wrap film drawn out from the packaging container is contacted with the protruding teeth at the center, the packaging container is twisted, and the teeth penetrate the center of the wrap film and cut it.
  • the wrap film housed in the packaging container is drawn out, a desired amount of the wrap film drawn out from the packaging container is contacted with one end of the cutting edge, the teeth penetrate the end of the wrap film, and then the wrap film is pulled to cut it from that end of the cutting edge toward the opposite end.
  • Patent document 1 Japanese Utility Model Application Laid-Open HEI No. 6-20224
  • Patent document 2 Japanese Utility Model Application Laid-Open HEI No. 11-151
  • Patent document 3 Registered Utility Model No. 2547868
  • Patent document 4 Japanese Patent Publication Laid-Open HEI No. 5-178344
  • Patent document 5 Japanese Patent Publication Laid-Open HEI No. 8-40433
  • the present inventors have studied the cutting power, cutting sharpness and durability of cutting edges with various shapes for wrap films.
  • the conventional straight-line cutting edges described in Patent documents 1 and 2 do not allow smooth cutting of the wrap film after the wrap film has been penetrated and thus have insufficient wrap film cutting power, compared to the conventional V-shaped cutting edges described in Patent documents 3 and 4.
  • a cutting edge such as described in Patent document 5, which is provided with protruding teeth at the ends of the cutting edge also tends to prevent smooth cutting of the wrap film after the wrap film has been penetrated while also having problems of teeth durability, compared to the conventional V-shaped cutting edges described in Patent documents 3 and 4.
  • the present invention has been accomplished in light of these circumstances, and its object is to provide a cutting edge with satisfactory cutting power, and satisfactorily excellent feeling and durability during cutting, whether the wrap film is cut from the apex of a V-shaped cutting edge or from either end of the cutting edge, as well as a packaging container comprising the cutting edge.
  • the cutting edge of the invention is a non-metallic V-shaped cutting edge comprising a plurality of teeth, that is mounted on a packaging container housing a packaged roll and that serves to cut the packaged roll, the cutting edge being characterized in that
  • the center area has a plurality of first teeth all of the same tooth height and having the greatest tooth height, and a plurality of second teeth all of the same tooth height and having a smaller tooth height than the first teeth
  • one of the first teeth is situated at the apex portion while the rest of the first teeth are arranged at prescribed intervals centering around the first tooth at the apex portion
  • the second teeth are arranged between the first teeth, (e) a first straight line connecting the tips of the first teeth, a second straight line connecting the tips of the second teeth and a third straight line connecting the bases of the first and second teeth are parallel to each other, the second straight line being located between the first and third straight lines
  • the intermediate area has a plurality of first teeth all of the same tooth height and having the greatest tooth height, and a plurality of second teeth all of the same tooth height and having a smaller tooth height than the first teeth
  • one of the first teeth is situated at the apex portion while the rest of the first teeth are arranged at prescribed intervals centering around the first tooth
  • cutting of the wrap film medium is separated into stages when cutting of the wrap film is initiated from the center area containing the apex portion of the V-shape of the cutting edge: an initial “piercing” stage at the center area and a subsequent “incision” stage at the intermediate areas and side areas.
  • the “piercing” stage is further separated into two steps: a piercing step by the first teeth which have the greatest tooth height, and a piercing step by the second teeth which have a lower tooth height than the first teeth. Since only the first teeth are in contact with the wrap film at the start of cutting, less force is necessary for piercing.
  • the only teeth in contact with the wrap film at the initial cutting are the few side teeth on the end sides of the cutting edge. Thus, less force is necessary to pierce the wrap film at the initial cutting.
  • the intermediate teeth with relatively low tooth heights, provided in the other intermediate area thereafter facilitate movement from the “piercing” stage to the “incision” stage.
  • the wrap film is then smoothly incised at the center area, the other intermediate areas and the other side areas as well, so that the wrap film is cut.
  • the tooth height of each tooth can be measured as the shortest distance between the bottom sections at the valleys formed by adjacent teeth, i.e. a third straight line connecting multiple base of teeth, and the tip of the tooth.
  • At least one tip of the side teeth is preferably directed further outward than the tips of the first teeth, second teeth and intermediate teeth. That is, the oblique line on the top side of the cutting edge of at least one of the side teeth is preferably longer than the oblique line on the end side of the cutting edge.
  • the tips of the side teeth in the side area are thus directed further outward than the tips of the first teeth, second teeth and intermediate teeth, it will be even easier to pierce the wrap film when cutting of the wrap film is initiated from the end of the wrap film, i.e. from the side area of the cutting edge.
  • the wrap film is even less easily caught during incision in the side area even when cutting of the wrap film is initiated from the center area which contains the apex portion of the V-shape of the cutting edge, so that cutting of the wrap film at the “incision” stage can be accomplished even more smoothly.
  • the tooth heights of the side teeth are preferably equal to or higher than those of the second teeth, and lower than those of the first teeth.
  • the cutting edge of the invention is a non-metallic V-shaped cutting edge comprising a plurality of teeth, which is mounted on a packaging container housing a packaged roll and serves to cut the packaged roll, the cutting edge being characterized in that
  • the center area has a plurality of first teeth all of the same tooth height and having the greatest tooth height, and a plurality of second teeth all of the same tooth height and having a smaller tooth height than the first teeth
  • one of the first teeth is situated at the apex portion while the rest of the first teeth are arranged at prescribed intervals centering around the first tooth at the apex portion
  • the second teeth are arranged between the first teeth, (e) a first straight line connecting the tips of the first teeth, a second straight line connecting the tips of the second teeth and a third straight line connecting the bases of the first and second teeth are parallel to each other, the second straight line being located between the first and third straight lines
  • the intermediate area has a plurality of first teeth all of the same tooth height and having the greatest tooth height, and a plurality of second teeth all of the same tooth height and having a smaller tooth height than the first teeth
  • one of the first teeth is situated at the apex portion while the rest of the first teeth are arranged at prescribed intervals centering around the first tooth
  • cutting of the wrap film medium is separated into stages when cutting of the wrap film is initiated from the center area containing the apex portion of the V-shape of the cutting edge: an initial “piercing” stage at the center area and a subsequent “incision” stage at the intermediate areas and side areas.
  • the “piercing” stage is further separated into two steps: a piercing step by the first teeth which have the greatest tooth height, and a piercing step by the second teeth which have a lower tooth height than the first teeth. Since only the first teeth are in contact with the wrap film at the start of cutting, less force is necessary for piercing.
  • the wrap film is then smoothly incised at the side areas as well, so that the wrap film is cut. Since at least one of the tips of the side teeth in the side area is directed further outward than the other tips, the wrap film is even less easily caught during incision in the side area, so that cutting of the wrap film at the “incision” stage can be accomplished even more smoothly.
  • Cutting of the wrap film medium is also separated into stages when cutting of the wrap film is initiated from the side areas of the cutting edge: an initial “piercing” stage at one side area and a subsequent “incision” stage at the other areas. Since side teeth directed further outward than the tips of the first teeth, second teeth and intermediate teeth are provided in the side area, less force is necessary for piercing of the wrap film at the initial cutting.
  • the intermediate teeth with relatively low tooth heights, provided in one intermediate area thereafter facilitate movement from the “piercing” stage to the “incision” stage.
  • the wrap film is then smoothly incised at the center area, the other intermediate area and the other side area as well, so that the wrap film is cut.
  • the wrap film can be easily and smoothly cut whether cutting of the wrap film is initiated from the end of the wrap film or whether it is initiated from the center of the wrap film.
  • the tooth height of each tooth can be measured as the shortest distance between the bottom sections at the valleys formed by adjacent teeth, i.e. a third straight line connecting multiple base of teeth, and the tip of the tooth.
  • the intermediate area preferably has large and small intermediate teeth with different tooth heights, alternately arranged.
  • Providing such intermediate teeth in the intermediate area can reduce the number of intermediate teeth that simultaneously contact the wrap film during transition from the “piercing” stage to the “incision” stage and during the “incision” stage, when cutting the wrap film. This smooths transition from the “piercing” stage to the “incision” stage compared with the case that intermediate teeth of the same tooth height are provided, thus allowing incision cutting of the wrap film to be accomplished with lower force.
  • the tooth heights of the intermediate teeth are preferably equal to or smaller than those of the second teeth.
  • the oblique line of at least one of the first teeth, second teeth, intermediate teeth and side teeth has an inwardly recessed arc-shape, i.e. the teeth are shaped like gingko leaves.
  • Such a shape creates an acute angle for the tip angle to ensure cutting power, while also increasing the inter-tooth pitch. This will eliminate the need to increase the number of teeth in a fixed range of length in the lengthwise direction of the cutting edge, and will limit the increase in force necessary for piercing of the wrap film. An effect of improved tooth durability is also obtained since the width is increased by the extent of the ends.
  • the cutting edge of the invention is attached to a packaging container it is possible to provide a packaging container with excellent cutting power.
  • the cutting edge of the invention is preferably attached to the back side of the front wall of the packaging container via a modified polyethylene resin. This will allow the cutting edge to be securely anchored to the packaging container with sufficient strength.
  • modified polyethylene resins there may be mentioned ethylenevinyl acetate copolymers, ethylenemethacrylic acid copolymers, and ionomers composed mainly of ethylene resins. Ethylenemethacrylic acid copolymers are particularly preferred among these.
  • the invention it is possible to provide a cutting edge with satisfactory cutting power whether the wrap film is cut from the apex of a V-shaped cutting edge or from either end of the cutting edge, and satisfactorily excellent feeling and durability during cutting, as well as a packaging container comprising the cutting edge.
  • FIG. 1 is a perspective view of the form of a packaging container 10 according to the invention.
  • FIG. 2 is a partial magnified view of the center of a cutting edge according to a first embodiment of the invention.
  • FIG. 3 is a partial magnified view of one side of a cutting edge according to the first embodiment of the invention.
  • FIG. 4 is a perspective view of the form of a packaging container 10 according to the invention.
  • FIG. 5 is a partial magnified view of one side of a cutting edge according to a second embodiment of the invention.
  • FIG. 6 is a partial magnified view of one side of a cutting edge according to a third embodiment of the invention.
  • FIG. 7 is a partial magnified view of the center of a cutting edge according to a modification of the first, second and third embodiments of the invention.
  • FIG. 8 is a schematic cross-sectional view of the laminated part of a packaging container wherein a cutting edge according to an embodiment of the invention is attached to the back side of the front wall of the cover via a resin sealant material.
  • 10 Packaging container, 12 : paper pirn, 14 : wrap film, 16 : container body, 18 : cover, 20 : container body rear wall top edge, 22 : cover front wall, 22 a : back side, 24 , 24 a , 24 b , 24 c : cutting edge, 26 : container body front wall base, 28 : center area, 29 , 29 a , 29 b : intermediate areas, 30 , 30 a , 30 b : side areas, 31 : intermediate first teeth (intermediate teeth), 32 : intermediate second teeth (intermediate teeth), 33 : side small teeth (side teeth), 34 : side large teeth (side teeth), 35 : small teeth, 36 : medium teeth (second teeth), 38 : large teeth (first teeth), 39 , 40 : side teeth, 50 : laminated section, 52 : adhesive layer, 54 : sealant material.
  • FIG. 1 is a perspective view of the form of a packaging container 10 according to the invention.
  • the packaging container 10 is constructed from a single cardboard sheet, and preferably a coated board sheet.
  • the packaging container 10 comprises a container body 16 which houses a wrap film 14 rolled around a cylindrical paper pirn 12 , and a cover 18 formed integrally with the container body 16 .
  • the overall shape of the packaging container 10 is essentially rectangular solid.
  • the wrap film is made of polyvinylidene chloride.
  • the top of the container body 16 is open, as an opening to allow the wrap film 14 to be drawn out.
  • the cover 18 extends continuously from the top edge 20 of the rear wall of the container body 16 .
  • the cover 18 is thus formed so as to be rotatable with respect to the container body 16 while covering the opening of the container body 16 .
  • the front edge of the front wall 22 of the cover 18 is V-shaped, and a V-shaped cutting edge 24 matching its shape is used.
  • the cutting edge 24 of this embodiment is divided into five areas: a center area 28 containing the apex portion of the V-shape, a pair of intermediate areas 29 situated on both sides thereof, and a pair of side areas 30 situated on the sides of the intermediate areas 29 opposite the center area 28 side.
  • the cutting edge 24 of this embodiment will now be explained in detail.
  • FIG. 2 is a partial magnified view of the center of the cutting edge according to the first embodiment of the invention.
  • the cutting edge 24 of this embodiment has bilateral symmetry centered around a center line passing through the apex of the V (labeled as CL in FIG. 2 ), and it comprises a center area 28 and intermediate areas 29 on either side thereof.
  • the center area 28 of this embodiment is composed of 15 teeth 35 , 36 , 38 , as shown in FIG. 2 .
  • the center area 28 has 3 types of teeth: teeth with a small tooth height (hereinafter referred to as “small teeth”) 35 , teeth with a larger tooth height than the small teeth 35 (second teeth: hereinafter referred to as “medium teeth”) 36 , and teeth with an even larger tooth height than the medium teeth 36 (first teeth: hereinafter referred to as “large teeth”) 38 .
  • small teeth small tooth height
  • second teeth hereinafter referred to as “medium teeth”
  • first teeth hereinafter referred to as “large teeth”
  • alphabetic letters will be appropriately added to the reference numerals 36 , 38 for the medium teeth and large teeth.
  • the tooth heights of the teeth can be measured as the shortest distance between a straight line connecting the bases (third straight line) L 3 and the apexes of the teeth.
  • One of the large teeth 38 ( 38 a ) is positioned at the apex portion of the V-shape of the cutting edge 24 (the center in the lengthwise direction of the center area 28 ), while the other large teeth 38 b , 38 c are positioned at prescribed intervals with two on either side around the central large tooth 38 a as the center.
  • the tip of the first large tooth 38 a at the center and the tips of the second and third large teeth 38 b , 38 c on either side can be connected by a straight line, and the straight line (first straight line) L 1 on either side is ahead of the tips of the medium teeth 36 on either side of the center area 28 (away from the front edge of the cover front wall 22 in FIG. 1 ). That is, the tips of the medium teeth 36 are located between the straight line connecting the bases (third straight line) L 3 and the straight line L 1 .
  • the four medium teeth 36 in the center area 28 are located on either side, for a total of eight.
  • the four medium teeth 36 a , 36 b toward the center are situated at a prescribed interval between the large teeth 38 a , 38 b , 38 c , and the other four medium teeth 36 c , 36 d are situated on the outside of the third large tooth 38 c at the same interval as the large teeth.
  • the tips of the medium teeth 36 a , 36 b , 36 c and 36 d on either side can be connected by a straight line (second straight line) L 2 , the straight line L 2 on either side being essentially parallel to the straight line L 1 and located further behind the straight line L 1 (nearer the front edge of the front wall 22 of the cover). That is, the straight line L 2 is situated between the straight line L 1 and the straight line L 3 .
  • Intermediate teeth 31 , 32 of two different tooth heights in the lengthwise direction of the cutting edge 24 are alternately provided in the intermediate area 29 .
  • the intermediate teeth with smaller tooth heights than the intermediate teeth 32 (hereinafter referred to as “intermediate first teeth”) 31 have the same tooth heights as the small teeth 35 in the center area 28
  • the intermediate teeth with greater tooth heights than the intermediate first teeth 31 (hereinafter referred to as “intermediate second teeth”) 32 have the same tooth heights as the medium teeth 36 in the center area 28 .
  • the straight line L 2 connecting the tips of the medium teeth 36 in the center area 28 passes through the tips of the intermediate second teeth 32 in the intermediate area 29 .
  • the straight line (fourth straight line) L 4 connecting the tips of the small teeth 35 in the center area 28 and the tips of the intermediate first teeth 31 in the intermediate area 29 is essentially parallel to the straight line L 1 and the straight line L 2 , and the straight line L 4 is located further behind the straight line L 2 (nearer the front edge of the front wall 22 of the cover). That is, the straight line L 4 is situated between the straight line L 2 and the straight line L 3 .
  • the tips of the intermediate teeth 31 , 32 in the intermediate area 29 are situated on a straight line which is on the same straight line as or parallel to the straight lines L 1 and L 2 , thus allowing even smoother incision of the wrap film.
  • FIG. 3 is a partial magnified view of the center of one side of a cutting edge according to the first embodiment of the invention.
  • the cutting edge 24 of this embodiment has a side area 30 on the side of the intermediate area 29 opposite the center area 28 side. Although the end of the cutting edge 24 is not shown in FIG. 3 , the cutting edge 24 has the same teeth 39 shown in FIG. 3 up to the end.
  • the cutting edge 24 of this embodiment also has the same teeth shown in FIG. 3 in the other side area 30 , as well.
  • the tips of the side teeth 39 can be connected by a straight line (fifth straight line) L 5 , the straight lines L 5 on either side being essentially parallel to the straight line L 2 connecting the tips of the intermediate second teeth 32 in the intermediate area 29 and the straight line L 4 connecting the apexes of the intermediate first teeth 31 , and each is located further forward than the straight lines L 2 and L 4 (further from the front edge of the front wall 22 of the cover in FIG. 1 ).
  • the straight line L 5 connecting the tips of the side teeth 39 is located further behind the straight line L 1 connecting the tips of the large teeth 38 in the center area 28 (nearer the front edge of the front wall 22 of the cover).
  • the straight line L 5 is situated between the straight line L 1 and the straight line L 2 .
  • the tips of the side teeth 39 may also be located on the straight line L 2 .
  • the tips of the side teeth 39 in the side area 30 are situated on a straight line which is parallel to the straight lines L 2 and L 4 , thus allowing even smoother incision of the wrap film.
  • the orientation of the tips of each of the teeth can be determined based on the orientation of the straight line connecting the tip of each tooth with the center between the bases on either side of the tooth. Since the straight line (K 1 ) for the side teeth 39 extends further than the straight line (K 2 ) for the intermediate teeth 31 , 32 ( FIG. 2 ) in the direction away from the center line CL of the cutting edge, in front of the cutting edge 24 (the projecting direction), the tips of the side teeth 39 are directed further outward than the tips of the intermediate first teeth 31 and intermediate second teeth 32 .
  • the tip angle ⁇ of each of the small teeth 35 , medium teeth 36 , large teeth 38 , intermediate first teeth 31 and intermediate second teeth 32 are suitable angles for piercing of the wrap film 14 .
  • the tip angle ⁇ is preferably in the range of 30°-90° and more preferably 40°-70°. If it is larger than 90° a greater amount of force will be necessary to pierce the wrap film 14 , and if it is smaller than 30° the durability of the teeth 31 - 38 themselves will tend to be impaired.
  • the tip angle ⁇ of the side teeth 39 is also an angle suitable for piercing of the wrap film 14 .
  • the tip angle ⁇ is preferably in the range of 20°-60° and more preferably 20°-40°. If it is larger than 60° a greater amount of force will be necessary to pierce the wrap film 14 , and if it is smaller than 20° the durability of the side teeth 39 themselves will tend to be impaired.
  • the angle ⁇ ( FIG. 3 ) formed between the straight line which is parallel to the center line CL of the cutting edge 24 ( FIG. 2 ) and passes through the bases on the outside of the side teeth 39 (the end side of the cutting edge), and the oblique line on the outside of the side teeth 39 (the end side of the cutting edge), is preferably 2-20°. This will allow a higher level of cutting power to be obtained both when the side teeth 39 are used for piercing of the wrap film and when they are used for incision of the wrap film.
  • the shapes of the small teeth 35 , medium teeth 36 , large teeth 38 , intermediate first teeth 31 and intermediate second teeth 32 may be simple isosceles triangle shapes, but for this embodiment it is preferred for at least one of the oblique lines to form a divergent shape or gingko leaf shape, with the arc recessed inward.
  • the shapes of the side teeth 39 may have straight lines as the triangular oblique lines, but preferably at least one of the oblique lines forms a divergent shape or gingko leaf shape, with the arc recessed inward. This is in order to maintain acute angles for the tip angles ⁇ and ⁇ , while improving durability. When such a shape is used, it is possible to reduce the number of teeth within regions of the same length compared to using straight-lines for the oblique lines, thus contributing to less force required for cutting.
  • FIG. 1 and FIG. 4 are perspective views of the form of a packaging container 10 wherein the invention is applied.
  • the packaging containers 10 shown in FIG. 1 and FIG. 4 are each provided with a cutting edge 24 having the tooth configuration shown in FIG. 2 and FIG. 3 .
  • One cutting method is a method in which the wrap film 14 is first pierced in the center area 28 containing the apex portion of the V-shape of the cutting edge 24 , and then the pierced wrap film 14 is incised in the order: intermediate area 29 on both sides, side area 30 on both sides (hereinafter referred to as “cutting method 1 ” for convenience).
  • Another cutting method (the method shown in FIG. 1 ) is a method in which the wrap film 14 is first pierced in the center area 28 containing the apex portion of the V-shape of the cutting edge 24 , and then the pierced wrap film 14 is incised in the order: intermediate area 29 on both sides, side area 30 on both sides (hereinafter referred to as “cutting method 1 ” for convenience).
  • Another cutting method (the method shown in FIG.
  • cutting method 2 is a method in which the wrap film 14 is first pierced in one of the side areas 30 a of the cutting edge 24 , and then the pierced wrap film 14 is incised in the order: one intermediate area 29 a adjacent to that side area 30 a , center area 28 , other intermediate area 29 b and other side area 30 b (hereinafter referred to as “cutting method 2 ” for convenience).
  • cutting method 1 first the packaging container 10 is held with one hand, the center front edge of the wrap film 14 is taken with the other hand, and the desired amount is drawn out, as shown in FIG. 1 .
  • the thumb of the hand holding the packaging container 10 is pressed against the center of the cover front wall 22 , and the packaging container 10 is twisted forward, i.e. in the direction of the arrow A.
  • the first large tooth 38 a in the apex portion of the cutting edge 24 is contacted with the wrap film 14 first, and pierces it ( FIG. 2 ).
  • the second large teeth 38 b and the third large teeth 38 c contact the wrap film 14 and pierce it.
  • the wrap film 14 is first contacted with only the five large teeth 38 with a large inter-tooth pitch and the largest tooth height, a smaller force is necessary to twist the packaging container 10 at the initial cutting. That is, since the minimum force necessary to pierce the wrap film 14 with each of the large teeth 38 is constant, the minimum force for twisting of the packaging container 10 is only about 5 times that force.
  • the medium teeth 36 contact the wrap film 14 next, with the wrap film 14 being penetrated by the medium teeth 36 . If no medium teeth 36 were present the pitch between the large teeth 38 would be wider, thus producing more resistance in the valleys between the teeth 38 (areas between the teeth) and increasing the force needed to incise the wrap film 14 . With this embodiment, however, the wrap film 14 between the large teeth 38 is penetrated by the medium teeth 36 after the wrap film 14 has been pierced by the large teeth 38 , so that piercing of the wrap film 14 is accomplished more smoothly.
  • the maximum number of medium teeth 36 that can simultaneously contact the wrap film 14 is 8, but since fewer than 8 of the medium teeth 36 actually contact the wrap film 14 simultaneously and the wrap film 14 is also pierced by the large teeth 38 , thus weakening the periphery, the force required for piercing with the medium teeth 36 is even lower than when piercing is accomplished by the large teeth 38 . Thus, the user does not feel resistance from the first-stage of cutting with the large teeth 38 to the second-stage of cutting by the medium teeth, and the operation is smooth.
  • twisting the packaging container 10 in the direction of the arrow A causes the small teeth 35 of the center area 28 to pierce the wrap film 14 between the third and fourth medium teeth 36 c , 36 d , so that incision of the wrap film 14 proceeds to the intermediate area 29 . If an initial piercing section of sufficient size is formed in the wrap film 14 , the force required to cut the wrap film 14 thereafter will not be very great, and the wrap film 14 will be smoothly incised and cut even in the intermediate area 29 comprising the intermediate first teeth 31 and intermediate second teeth 32 and the side area 30 comprising the side teeth 39 ( FIG. 3 ).
  • cutting method 2 first the packaging container 10 is held with one hand, the front edge of the side section of the wrap film 14 is taken with the other hand, and the desired amount is drawn out, as shown in FIG. 4 .
  • the container is anchored with the hand gripping the packaging container 10 while the wrap film 14 is lifted upward, i.e. in the direction of the arrow B, with the other hand, so that one end of the wrap film 14 is pressed against one side area 30 a of the cutting edge 24 .
  • the wrap film 14 When the wrap film 14 is further lifted in the direction of the arrow B, the wrap film 14 is penetrated by the side teeth 39 .
  • the wrap film 14 will usually be drawn slightly forward (toward the user) when the wrap film 14 is lifted in the direction of the arrow B, the tips of the side teeth 39 are directed further outward than the other teeth 31 - 38 , and therefore the direction of the tips can be aligned with the pull direction of the wrap film 14 , thus allowing even easier piercing of the wrap film 14 .
  • a particularly large force is no longer necessary to cut the wrap film 14 , and this reduces the need to excessively minimize the tip angle ⁇ of the teeth 31 , 32 , 35 , 36 , 38 and the tip angle ⁇ of the side teeth 39 , thus improving the durability of the teeth 31 , 32 , 35 , 36 , 38 , 39 .
  • the number of teeth provided on the cutting edge 24 can be appropriately adjusted according to the length of the cutting edge 24 in the lengthwise direction and the inter-tooth pitch. From the viewpoint of further facilitating piercing of the wrap film in cutting method 1 , however, the total number of teeth in the center area 28 is preferably 5-31, more preferably 7-25 and even more preferably 9-19.
  • the total number of teeth in each intermediate area 29 is preferably 10-100, more preferably 20-90 and even more preferably 40-60.
  • the total number of teeth in each side area 30 is preferably 1-150, more preferably 5-100 and even more preferably 10-50. If the total number of teeth in the side area 30 is excessive, the region of the side area 30 in the cutting edge 24 will be relatively larger as a result, thus tending to interfere with satisfactory cutting power when the wrap film is cut by cutting method 1 .
  • the distance from the fixed part of the cutting edge 24 i.e. the distance from the front edge of the front wall 22 of the cover, will be increased, potentially impairing the durability. If the tooth height is too large, the hand of the user handling the packaging container 10 may be cut.
  • the tooth height H 1 of the large teeth 38 in the center area 28 is preferably 1.0-4.0 mm, more preferably 1.2-3.5 mm and even more preferably 1.2-2.5 mm
  • the tooth height H 2 of the medium teeth 36 is preferably 0.8-2.0 mm and more preferably 0.9-1.5 mm
  • the tooth height H 3 of the small teeth 35 is preferably 0.4-1.5 mm and more preferably 0.5-1.0 mm.
  • the inter-tooth pitch of the center area 28 is preferably 3.0-9.0 mm, more preferably 3.5-7.0 mm and even more preferably 4.0-6.0 mm between the large teeth 38 , and preferably 3.0-9.0 mm, more preferably 3.5-7.0 mm and even more preferably 4.0-6.0 mm between the medium teeth 36 . If the inter-tooth pitch between the large teeth 38 and between the medium teeth 36 is greater than 9.0 mm, the film 14 may become caught in the valleys (bases of teeth) between the large teeth 38 at the “piercing” stage of the wrap film 14 in cutting method 1 , thus causing a hindrance to cutting.
  • the tooth height 112 of the intermediate second teeth 32 in the intermediate area 29 is preferably 0.8-2.0 mm and more preferably 0.9-1.5 mm.
  • the tooth height H 3 of the intermediate first teeth 31 in the intermediate area 29 is preferably 0.4-1.5 mm and more preferably 0.5-1.0 mm.
  • the inter-tooth pitch between the intermediate first teeth 31 and the inter-tooth pitch between the intermediate second teeth 32 is preferably 1.0-3.5 mm and more preferably 1.5-3.0 mm.
  • the tooth height H 4 of the side teeth 39 in the side area 30 is preferably 0.8-3.5 mm, more preferably 0.9-2.0 mm and even more preferably 1.0-1.5 mm.
  • the inter-tooth pitch between the side teeth 39 is preferably 0.5-3.5 mm and more preferably 0.7-2.5 mm.
  • FIG. 5 is a partial magnified view of the center of one side of a cutting edge according to the second embodiment of the invention.
  • the cutting edge 24 a of FIG. 5 differs from the cutting edge 24 of the embodiment described above in that it comprises side teeth 33 and 34 in the side area 30 .
  • the cutting edge 24 a has the same tooth configuration as the cutting edge 24 of the embodiment described above ( FIG. 2 ).
  • the cutting edge 24 a also has the same tooth configuration as FIG. 5 in the other side area and the other intermediate area.
  • side small teeth 33 which have the same shapes and tooth heights as the intermediate first teeth 31 in the intermediate area 29 , and side large teeth 34 whose tips are directed outward.
  • the tips of the side large teeth 34 are located on the straight line L 2 connecting the tips of the medium teeth 36 of the center area 28 and the tips of the intermediate second teeth 32 of the intermediate area 29 .
  • the tips of the side small teeth 33 are located on the straight line L 4 connecting the tips of the intermediate first teeth 31 of the intermediate area 29 .
  • the side small teeth 33 have the same tip angle as the tip angle ⁇ of the intermediate first teeth 31 and intermediate second teeth 32 .
  • the shapes of the side small teeth 33 may be simple isosceles triangles, but preferably at least one of the oblique lines is a divergent shape or gingko leaf shape, with the arc recessed inward. This will maintain the tip angle ⁇ at a given acute angle while improving the durability. When such a shape is used, it is possible to reduce the number of teeth within regions of the same length compared to using straight-lines for the oblique lines, thus contributing to less force required for cutting.
  • the orientation of the tips of each of the teeth can be determined based on the orientation of the straight line connecting the tip of each tooth with the center between the bases on either side of the tooth. Since the straight line (K 3 ) for the side large teeth 34 extends more than the straight line (K 2 ) for the intermediate teeth 31 , 32 ( FIG. 2 ) in the direction away from the center line CL of the cutting edge, in front of the cutting edge 24 a (the projecting direction), the tips of the side large teeth 34 are directed further outward than the tips of the intermediate teeth 31 , 32 and side small teeth 33 .
  • the tip angle ⁇ of each of the small teeth 35 , medium teeth 36 , large teeth 38 , intermediate first teeth 31 and intermediate second teeth 32 are suitable angles for piercing of the wrap film 14 .
  • the tip angle ⁇ is preferably in the range of 30°-90° and more preferably 40°-70°. If it is larger than 90° a greater amount of force will be necessary to pierce the wrap film 14 , and if it is smaller than 30° the durability of the teeth 31 - 38 themselves will tend to be impaired.
  • the tip angle of the side large teeth 34 is also an angle suitable for piercing of the wrap film 14 .
  • the tip angle ⁇ is preferably in the range of 20°-60° and more preferably 20°-40°. If it is larger than 60° a greater amount of force will be necessary to pierce the wrap film 14 , and if it is smaller than 20° the durability of the side large teeth 34 themselves will tend to be impaired.
  • the angle ⁇ ( FIG. 5 ) formed between the straight line which is parallel to the center line CL of the cutting edge ( FIG. 2 ) and passes through the bases on the outside of the side large teeth 34 (the end side of the cutting edge), and the oblique line on the outside of the side teeth 39 (the end side of the cutting edge), is preferably 2-20°. This will allow a higher level of cutting power to be obtained both when the side large teeth 34 are used for piercing of the wrap film and when they are used for incision of the wrap film.
  • At least one of the oblique lines forms a divergent shape or gingko leaf shape, with the arc recessed inward. This is in order to maintain acute angles for the tip angle ⁇ , while improving durability.
  • FIG. 1 and FIG. 4 are perspective views of the form of a packaging container 10 wherein the invention is applied.
  • the packaging containers 10 shown in FIG. 1 and FIG. 4 are each provided with a cutting edge 24 a having the tooth configuration shown in FIG. 2 and FIG. 5 .
  • One cutting method is a method in which the wrap film 14 is first pierced in the center area 28 containing the apex portion of the V-shape of the cutting edge 24 a , and then the pierced wrap film 14 is incised in the order: intermediate area 29 on both sides, side area 30 on both sides (hereinafter referred to as “cutting method 1 ” for convenience).
  • Another cutting method is a method in which the wrap film 14 is first pierced in one of the side areas 30 a of the cutting edge 24 a , and then the pierced wrap film 14 is incised in the order: one intermediate area 29 a adjacent to that side area 30 a , center area 28 , other intermediate area 29 b and other side area 30 b (hereinafter referred to as “cutting method 2 ” for convenience).
  • cutting method 1 first the packaging container 10 is held with one hand, the center front edge of the wrap film 14 is taken with the other hand, and the desired amount is drawn out, as shown in FIG. 1 .
  • the thumb of the hand holding the packaging container 10 is pressed against the center of the cover front wall 22 , and the packaging container 10 is twisted forward, i.e. in the direction of the arrow A.
  • the first large tooth 38 a in the apex portion of the cutting edge 24 a is contacted with the wrap film 14 first, and pierces it ( FIG. 2 ).
  • the second large teeth 38 b and the third large teeth 38 c contact the wrap film 14 and pierce it.
  • the wrap film 14 is first contacted with only the five large teeth 38 with a large inter-tooth pitch and the largest tooth height, a smaller force is necessary to twist the packaging container 10 at the initial cutting. That is, since the minimum force necessary to pierce the wrap film 14 with each of the large teeth 38 is constant, the minimum force for twisting of the packaging container 10 is only about 5 times that force.
  • the medium teeth 36 contact the wrap film 14 next, with the wrap film 14 being penetrated by the medium teeth 36 . If no medium teeth 36 were present the pitch between the large teeth 38 would be wider, thus producing more resistance in the valleys between the teeth 38 (areas between the teeth) and increasing the force needed to incise the wrap film 14 . With this embodiment, however, the wrap film 14 between the large teeth 38 is penetrated by the medium teeth 36 after the wrap film 14 has been pierced by the large teeth 38 , so that piercing of the wrap film 14 is accomplished more smoothly.
  • the maximum number of medium teeth 36 that can simultaneously contact the wrap film 14 is 8, but since fewer than 8 of the medium teeth 36 actually contact the wrap film 14 simultaneously and the wrap film 14 is also pierced by the large teeth 38 , thus weakening the periphery, the force required for piercing with the medium teeth 36 is even lower than when piercing is accomplished by the large teeth 38 . Thus, the user does not feel resistance from the first-stage of cutting with the large teeth 38 to the second-stage of cutting by the medium teeth, and the operation is smooth.
  • twisting the packaging container 10 in the direction of the arrow A causes the small teeth 35 of the center area 28 to pierce the wrap film 14 between the third and fourth medium teeth 36 c , 36 d , so that incision of the wrap film 14 proceeds to the intermediate area 29 . If an initial piercing section of sufficient size is formed in the wrap film 14 , the force required to cut the wrap film 14 thereafter will not be very great, and the wrap film 14 will be smoothly incised and cut even in the intermediate area 29 comprising the intermediate first teeth 31 and intermediate second teeth 32 and the side area 30 comprising the side teeth 33 , 34 ( FIG. 5 ).
  • the packaging container 10 is held with one hand, the front edge of the side section of the wrap film 14 is taken with the other hand, and the desired amount is drawn out, as shown in FIG. 4 .
  • the container is anchored with the hand gripping the packaging container 10 while the wrap film 14 is lifted upward, i.e. in the direction of the arrow B, with the other hand, so that one end of the wrap film 14 is pressed against the other side area 30 a of the cutting edge 24 a.
  • the wrap film can be easily cut with satisfactory feeling during cutting, whether from the apex portion of the V-shape of the cutting edge 24 a or from one end of the cutting edge 24 a.
  • the preferred total number of teeth, the tooth heights and the inter-tooth pitch in the center area 28 and intermediate area 29 of the cutting edge 24 a is the same as for the first embodiment.
  • the total number of teeth in each side area 30 is preferably 1-150, more preferably 5-100 and even more preferably 10-50. If the total number of teeth in the side area 30 is excessive, the region of the side area 30 in the cutting edge 24 a will be larger as a result, thus tending to interfere with satisfactory cutting power when the wrap film is cut by cutting method 1 .
  • the tooth height H 2 of the side large teeth 34 in the side area 30 is preferably 0.8-2.0 mm and more preferably 0.9-1.5 mm, and the tooth height H 3 of the side small teeth 33 is preferably 0.4-1.5 mm and more preferably 0.5-1.0 mm.
  • the inter-tooth pitch between the side large teeth 34 and the inter-tooth pitch between the side small teeth 33 is preferably 1.0-3.5 mm and more preferably 1.5-3.0 mm.
  • FIG. 6 is a partial magnified view of the center of one side of a cutting edge according to the third embodiment of the invention.
  • the cutting edge 24 b of FIG. 6 differs from the cutting edge 24 of the first embodiment in that it comprises side teeth 40 in the side area 30 .
  • the cutting edge 24 b has the same tooth configuration as the cutting edge 24 of the embodiment described above.
  • the cutting edge 24 a also has the same tooth configuration as FIG. 6 in the other side area and the other intermediate area.
  • the side teeth 40 provided in the side area 30 of the cutting edge 24 b of this embodiment have the same shapes as the intermediate first teeth 31 and intermediate second teeth 32 in the intermediate area 29 .
  • the straight line L 5 connecting the tips of the side teeth 40 is located between the straight line L 1 connecting the large teeth of the center area and the straight line L 2 connecting the medium teeth of the center area.
  • the effect of the invention can also be obtained with this type of side teeth 40 .
  • the wrap film can be easily cut with satisfactory feeling during cutting, whether from the apex portion of the V-shape of the cutting edge 24 b or from one end of the cutting edge 24 b .
  • the cutting edge 24 b comprising the side teeth 40 has even more excellent durability.
  • the side teeth 40 have the same tip angle as the tip angle ⁇ of the intermediate first teeth 31 and intermediate second teeth 32 .
  • the shapes of the side teeth 40 may be simple isosceles triangles, but preferably at least one of the oblique lines is a divergent shape or gingko leaf shape, with the arc recessed inward. This will maintain the tip angle ⁇ at a given acute angle while improving the durability. When such a shape is used, it is possible to reduce the number of teeth within regions of the same length compared to using straight-lines for the oblique lines, thus contributing to less force required for cutting.
  • the tip angle ⁇ of each of the small teeth 35 , medium teeth 36 , large teeth 38 , intermediate first teeth 31 , intermediate second teeth 32 and side teeth 40 are suitable angles for piercing of the wrap film 14 .
  • the tip angle ⁇ is preferably in the range of 30°-90° and more preferably 40°-70°. If it is larger than 90° a greater amount of force will be necessary to pierce the wrap film 14 , and if it is smaller than 30° the durability of the teeth 31 - 40 themselves will tend to be impaired.
  • the shapes of the small teeth 35 , medium teeth 36 , large teeth 38 , intermediate first teeth 31 , intermediate second teeth 32 and side teeth 40 may be simple isosceles triangle shapes, but for this embodiment it is preferred for at least one of the oblique lines to be a divergent shape or gingko leaf shape, with the arc recessed inward. This is in order to maintain acute angles for the tip angle ⁇ , while improving durability. When such a shape is used, it is possible to reduce the number of teeth within regions of the same length compared to straight-lines for the oblique lines, thus contributing to less force required for cutting.
  • FIG. 1 and FIG. 4 are perspective views of the form of a packaging container 10 in which the invention is applied.
  • the packaging containers 10 shown in FIG. 1 and FIG. 4 are each provided with a cutting edge 24 b having the tooth structures shown in FIG. 2 and FIG. 6 .
  • One cutting method is a method in which the wrap film 14 is first pierced in the center area 28 containing the apex portion of the V-shape of the cutting edge 24 b , and then the pierced wrap film 14 is incised in the order: intermediate area 29 on both sides, side area 30 on both sides (hereinafter referred to as “cutting method 1 ” for convenience).
  • Another cutting method is a method in which the wrap film 14 is first pierced in one of the side areas 30 a of the cutting edge 24 b , and then the pierced wrap film 14 is incised in the order: one intermediate area 29 a adjacent to that side area 30 a , center area 28 , other intermediate area 29 b and other side area 30 b (hereinafter referred to as “cutting method 2 ” for convenience).
  • cutting method 1 first the packaging container 10 is held with one hand, the center front edge of the wrap film 14 is taken with the other hand, and the desired amount is drawn out, as shown in FIG. 1 .
  • the thumb of the hand holding the packaging container 10 is pressed against the center of the cover front wall 22 , and the packaging container 10 is twisted forward, i.e. in the direction of the arrow A.
  • the first large tooth 38 a in the apex portion of the cutting edge 24 b is contacted with the wrap film 14 first, and pierces it ( FIG. 2 ).
  • the second large teeth 38 b and the third large teeth 38 c contact the wrap film 14 and pierce it.
  • the wrap film 14 is first contacted with only the five large teeth 38 with a large inter-tooth pitch and the largest tooth height, a smaller force is necessary to twist the packaging container 10 at the initial cutting. That is, since the minimum force necessary to pierce the wrap film 14 with each of the large teeth 38 is constant, the minimum force for twisting of the packaging container 10 is only about 5 times that force.
  • the medium teeth 36 contact the wrap film 14 next, with the wrap film 14 being penetrated by the medium teeth 36 . If no medium teeth 36 were present the pitch between the large teeth 38 would be wider, thus producing more resistance in the valleys between the teeth 38 (areas between the teeth) and increasing the force needed to incise the wrap film 14 . With this embodiment, however, the wrap film 14 between the large teeth 38 is penetrated by the medium teeth 36 after the wrap film 14 has been pierced by the large teeth 38 , so that piercing of the wrap film 14 is accomplished more smoothly.
  • the maximum number of medium teeth 36 simultaneously contacting the wrap film 14 is 8, but since fewer than 8 of the medium teeth 36 are actually contacting the wrap film 14 simultaneously and the wrap film 14 is also pierced by the large teeth 38 , thus weakening the periphery, the force required for piercing with the medium teeth 36 is even lower than when piercing is accomplished by the large teeth 38 . Thus, the user does not feel resistance from the first-stage of cutting with the large teeth 38 to the second-stage of cutting by the medium teeth, and the operation is smooth.
  • twisting the packaging container 10 in the direction of the arrow A causes the small teeth 35 of the center area 28 to pierce the wrap film 14 between the third and fourth medium teeth 36 c , 36 d , so that incision of the wrap film 14 proceeds to the intermediate area 29 . If an initial piercing section of sufficient size is formed in the wrap film 14 , the force required to cut the wrap film 14 thereafter will not be very great, and the wrap film 14 will be smoothly incised and cut even in the intermediate area 29 comprising the intermediate first teeth 31 and intermediate second teeth 32 and the side area 30 comprising the side teeth 40 ( FIG. 6 ).
  • the packaging container 10 is held with one hand, the front edge of the side section of the wrap film 14 is taken with the other hand, and the desired amount is drawn out, as shown in FIG. 4 .
  • the container is anchored with the hand gripping the packaging container 10 while the wrap film 14 is lifted upward, i.e. in the direction of the arrow B, with the other hand, so that one end of the wrap film 14 is pressed against the other side area 30 a of the cutting edge 24 b.
  • the wrap film can be easily cut with satisfactory feeling during cutting, whether from the apex portion of the V-shape of the cutting edge 24 b or from one end of the cutting edge 24 b.
  • the number of side teeth 40 provided in one side area 30 of the cutting edge 24 b is preferably 5-100, more preferably 10-50 and even more preferably 20-45. If the number of side teeth 40 provided in one side teeth 30 is less than 20, the region of formation of the initial piercing section of the wrap film will be narrower in the cutting method in which cutting of the wrap film is initiated from one side area 30 of the cutting edge 24 b , and smooth movement from the “piercing” stage to the “incision” stage will tend to be impaired. If the number of side teeth 40 in the side teeth 30 is greater than 100, the satisfactory feeling in the “incision” stage during cutting of the wrap film will tend to be impaired, in the cutting method in which cutting is initiated from the center area of the cutting edge 24 b.
  • the tooth height H 4 of the side teeth 40 in the side area 30 is preferably 0.8-3.5 mm, more preferably 0.9-2.0 mm and even more preferably 1.0-1.5 mm.
  • the inter-tooth pitch between the side teeth 40 is preferably 0.5-3.5 mm and more preferably 0.7-2.5 mm.
  • FIG. 7 is a partial magnified view of the center of a cutting edge according to a modification of the first, second and third embodiments of the invention.
  • the cutting edge 24 c of FIG. 7 differs from the cutting edge 24 of the embodiment described above in that it comprises only side teeth 31 in the intermediate area 29 . Specifically, in the center area 28 and side area (not shown), the cutting edge 24 c has the same tooth configuration as the cutting edge 24 of the first embodiment.
  • the straight line L 4 connecting the tips of the side teeth 31 is located between the straight line L 2 connecting the tips of the medium teeth 36 in the center area 28 and straight line L 3 connecting the bases of teeth.
  • the effect of the invention can be obtained even when the intermediate area 29 is composed only of side teeth 31 with the same tooth heights as in the cutting edge 24 c , thus allowing easy incision of the wrap film.
  • wrap film was composed of polyvinylidene chloride in the embodiments described above, the invention may be applied to wrap films made of other resins as well.
  • the tooth heights, inter-tooth pitch and tip angles may be appropriately modified from the dimensions mentioned above.
  • the packaged roll may be aluminum or paper instead of a wrap film.
  • the material of the cutting edge for these embodiments may be vulcanized fiber, a resin-impregnated sheet or a resin, but a resin with high strength is preferred.
  • the resin used may be polyester, polyethylene, polypropylene, polystyrene, acetal resin, polyphenylene sulfide, PEEK (polyether ether ketone resin), PES (polyethersulfone resin) or the like. Polyester is preferred, with polyethylene terephthalate being more preferred.
  • a biodegradable resin is a polymer material that is decomposed to low molecular compounds by natural microorganisms when it is disposed of after use, eventually being completely decomposed to carbon dioxide gas and water, while maintaining the same function as a conventional resin during use, and this function can provide a cutting edge that is more friendly to the environment.
  • biodegradable resins there may be mentioned polylactic acid resins and polyglycolic acid resins.
  • the cutting edge of each of the embodiments described above may be formed using one of the resin materials mentioned above or a mixture of two or more thereof.
  • An inorganic powder such as calcium carbonate, titanium oxide, silica, barium sulfate or talc may be added to one resin material or a resin material comprising a mixture of two or more thereof, in an amount of 5-70 wt % with respect to the total material of the cutting edge. Addition of an inorganic powder can improve the mechanical strength.
  • the cutting edge may be formed by molding such materials into a sheet with a thickness of 0.05-0.5 mm, preferably 0.1-0.3 mm and more preferably 0.20-0.28 mm, and then punching with a die.
  • a cutting edge thickness of greater than 0.5 mm may not result in sufficiently satisfactory cutting power, while a cutting edge thickness of less than 0.05 mm may interfere with satisfactory cutting sharpness.
  • FIG. 8 is a schematic cross-sectional view of the laminated part of a packaging container wherein a cutting edge according to an embodiment of the invention is attached to the back side of the front wall of the cover via a resin sealant material.
  • a sealant material 54 , adhesive layer 52 and cutting edge 24 are laminated in that order on the back side 22 a of the front wall 22 of the cover.
  • the cutting edge 24 attached to the back side 22 a of the front wall of the packaging container cover via the sealant material 54 is anchored to the packaging container cover by sufficient adhesive force, and therefore it does not easily peel from the packaging container cover.
  • the method of attaching the cutting edge to the back side of the front wall of the packaging container cover may be a known cold glue method or pressure-sensitive adhesive method.

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  • Forests & Forestry (AREA)
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JP2007257957A JP5069075B2 (ja) 2007-10-01 2007-10-01 包装容器用の切断刃及びそれを有する包装容器
JP2007-257957 2007-10-01
PCT/JP2008/067494 WO2009044679A1 (ja) 2007-10-01 2008-09-26 包装容器用の切断刃及びそれを有する包装容器

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ES2541712T3 (es) * 2011-11-17 2015-07-23 Cryovac, Inc. Aparato de envasado que comprende un cortador para cortar una película
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JP7096064B2 (ja) * 2018-05-11 2022-07-05 株式会社クレハ 切断刃および包装容器
WO2020188899A1 (ja) * 2019-03-19 2020-09-24 株式会社クレハ 切断刃および包装容器
CN111661700B (zh) * 2020-05-21 2022-01-18 嘉善恒宇塑胶有限公司 一种带有v形齿的食品保鲜膜盒及其使用方法

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WO2009044679A1 (ja) 2009-04-09
CN101815652A (zh) 2010-08-25
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TWI392624B (zh) 2013-04-11
RU2415787C1 (ru) 2011-04-10
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HK1144678A1 (en) 2011-03-04
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