A method for joining films having a hydrophilized surface at a single surface and an excellent melt-bonding force at the melt-bonded portion, which is formed by disposing two films (A) having a hydrophilized surface at a single surface, to align the hydrophilized surfaces so as to butt each end port
A method for joining films having a hydrophilized surface at a single surface and an excellent melt-bonding force at the melt-bonded portion, which is formed by disposing two films (A) having a hydrophilized surface at a single surface, to align the hydrophilized surfaces so as to butt each end portion; overlaying a film (B) on a side of non-hydrophilized surface of the films (A), so as to bridge the butting portion, and hot-pressing the overlapping portion (c1)5 to join the two films (A). A wide film obtained by the above-mentioned method is suitable for a covering material for agricultural use.
대표청구항▼
1. A film-joining method comprising:adjacently disposing two films, each comprising a hydrophilized surface and a non-hydrophilized surface, end-to-end, overlaying a third film so as to overlap the two films on their non-hydrophilized sides to form an overlapping portion between the two films and th
1. A film-joining method comprising:adjacently disposing two films, each comprising a hydrophilized surface and a non-hydrophilized surface, end-to-end, overlaying a third film so as to overlap the two films on their non-hydrophilized sides to form an overlapping portion between the two films and the third film, and hot-pressing the overlapping portion of the two films and the third film so as to join the two films and the third film. 2. The joining method according to claim 1, wherein the overlapping portion is hot-pressed at a temperature ranging from ?30° C. to +20° C. below or above the melting point of a resin constituting the two films and the third film.3. The joining method according to claim 1, wherein the overlapping portion is hot-pressed using an upper heater and a lower heater.4. The joining method according to claim 1, wherein central portions of each respective half portion of the overlapping portion are first hot-pressed using an upper heater and a lower heater at a temperature ranging from ?5° C. to +20° C. below or above the melting point of a resin, constituting the two films and the third film.5. The joining method according to claim 1, wherein central portions of each respective half portion of the overlapping portion are first hot-pressed, and then the overlapping portion is subsequently hot-pressed, using an upper heater and a lower heater at a temperature ranging from ?30° C. to ?5° C. below the melting point of a resin, constituting the two films and the third film.6. The joining method according to claim 1, wherein central portions of each respective half portion of the overlapping portion are hot-pressed at a temperature ranging from 0° C. to +10° C. below or above the melting point of a resin, constituting the two films and the third film.7. The joining method according to claim 1, wherein central portions of each respective half portion of the overlapping portion are hot-pressed using a comb-type heater.8. The joining method according to claim 1, wherein the hot-pressing of the two films and the third film takes place at a pressure of 0.01 to 10 MPa.9. The joining method according to claim 1, further comprising cooling the two films and the third film.10. The joining method according to claim 1, wherein the two films and the third film are either fluororesin films or polyolefin films.11. The joining method according to claim 1, wherein the two films and the third film are ethylene/tetrafluoroethylene copolymer films.12. The joining method according to claim 1, wherein the width of each of the two films is from 50 to 250 cm.13. The joining method according to claim 1, wherein the width of the third film is from 2 to 10 cm.14. The joining method according to claim 1, wherein the hydrophilized surfaces of the two films are formed by sputtering a metal oxide.15. The joining method according to claim 1, wherein the hydrophilized surfaces of the two films are formed by sputtering an oxide of Si and/or Sn.16. The joining method according to claim 1, wherein the hydrophilized surfaces of the two films are formed by coating a mixed solution of SiO2 and Al2O3 sols.17. The joining method according to claim 1, wherein the thickness of the third film is 30 to 300 μm.18. A wide film having a width of 1 to 150 m formed by joining two or more films by repeating the joining method described in claim 1.19. A wide film obtained using the joining method of claim 1, having a peel strength in the melt-bonded portions of about 2.0 kg/10 mm.20. A covering material for agricultural use, which comprises the wide film of claim 18.
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