Claims
- 1. A vulcanized fiber sheet having a serrated cutting edge, comprising a vulcanized fiber blank having two outer surfaces provided with a moisture-proof low-density polyethylene film, said serrated cutting edge being formed on at least one edge of said sheet.
- 2. A vulcanized fiber sheet having a serrated cutting edge as claimed in claim 1, wherein said moisture-proof film is formed over a water-resisting agent applied to said vulcanized fiber blank.
- 3. A vulcanized fiber sheet having a serrated cutting edge as claimed in claim 1, wherein said sheet has the shape of a rectangle and a plurality of cutting teeth provided on the cutting edge thereof, each cutting tooth in a central portion of said cutting edge having the shape of an isosceles triangle, each cutting tooth provided at two outer end portions of said cutting edge having the shape of a scalene triangle inclined away from said central portion of said cutting edge.
- 4. A carton to which a vulcanized fiber sheet having a serrated cutting edge and two outer surfaces is adhered, said carton having a carton body and a cover, said carton body comprising a bottom wall panel, a front wall panel, a rear wall panel and side panels, said cover covering an opening of said carton body, a moisture-proof film being formed on the two outer surfaces of said vulcanized fiber sheet, said moisture-proof film being a low density polyethylene film.
- 5. A carton to which a vulcanized fiber sheet having a serrated cutting edge as claimed in claim 4, is adhered, wherein said sheet is adhered to a dried polyethylene emulsion applied to a carton blank.
- 6. A vulcanized fiber sheet having a serrated cutting edge as claimed in claim 2, wherein said water-resisting agent is one of a melamine resin and glyoxal.
- 7. A vulcanized fiber sheet having a serrated cutting edge as claimed in claim 1, wherein said serrated cutting edge has a thickness of from 0.2 to 0.5 mm.
- 8. A vulcanized fiber sheet having a serrated cutting edge as claimed in claim 7, wherein said serrated cutting edge has a thickness of from 0.25 to 0.35 mm.
- 9. A vulcanized fiber sheet having a serrated cutting edge as claimed in claim 3, wherein said scalene triangle has a vertical angle of about 58°.
- 10. A vulcanized fiber sheet having a serrated cutting edge as claimed in claim 3, wherein said scalene triangle has a vertical angle of about 49°.
- 11. A carton to which a vulcanized fiber sheet having a serrated cutting edge and two outer surfaces is adhered as claimed in claim 4, wherein said serrated cutting edge has a thickness of 0.2 to 0.5 mm.
- 12. A carton to which a vulcanized fiber sheet having a serrated cutting edge and two outer surfaces is adhered as claimed in claim 4, wherein said serrated cutting edge has a central portion with a plurality of cutting teeth having the shape of an isosceles triangle and two outer portions having a plurality of cutting teeth having the shape of a scalene triangle inclined away from said central portion of said serrated cutting edge.
- 13. A method of adhering a vulcanized fiber sheet having a serrated cutting edge to a carton blank, said carton blank comprising a bottom wall panel, a front wall panel, a rear wall panel, side panels and a cover, said method comprising the steps of forming a moisture-proof low-density polyethylene film on said vulcanized fiber sheet and adhering said vulcanized fiber sheet through said moisture-proof film to a predetermined portion of said carton blank by an ultrasonic adhesion method.
- 14. A method as claimed in claim 13, wherein said serrated cutting edge has a thickness of 0.2 to 0.5 mm.
- 15. A method as claimed in claim 13, wherein said serrated cutting edge has a central portion with a plurality of cutting teeth having the shape of an isosceles triangle and two outer portions having a plurality of cutting teeth having the shape of a scalene triangle inclined away from said central portion of said serrated cutting edge.
- 16. A vulcanized fiber sheet having a serrated cutting edge as claimed in claim 1, wherein a waterproof film is formed on the serrated cutting edge.
- 17. A vulcanized fiber sheet having a serrated cutting edge as claimed in claim 16, wherein said waterproof film is formed from an electron beam curing resin or an ultraviolet curing resin.
Priority Claims (2)
Number |
Date |
Country |
Kind |
3-81640 |
Sep 1991 |
JP |
|
4-116773 |
Apr 1992 |
JP |
|
Parent Case Info
This application is a continuation of U.S. Ser. No. 08/211,091, filed Mar. 14, 1994 now abandoned.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/JP92/01176 |
|
WO |
00 |
3/14/1994 |
3/14/1994 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO93/04935 |
3/18/1993 |
WO |
A |
US Referenced Citations (11)
Foreign Referenced Citations (3)
Number |
Date |
Country |
1-114532 |
Aug 1989 |
JP |
1-294429 |
Nov 1989 |
JP |
3-26719 |
Mar 1991 |
JP |
Continuations (1)
|
Number |
Date |
Country |
Parent |
08/211091 |
Mar 1994 |
US |
Child |
08/758979 |
|
US |