Thermal transfer roll for manufacture of laminate plate, method

Details Thermal transfer roll for manufacture of laminate plate, method Thermal transfer roll for manufacture of laminate plate, method

1998-02-04

2000-03-14

Sells, James

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156555, 156582, 1565831, 1565834, 492 46, B32B 3100

Patent

active

060368144

DESCRIPTION:

BRIEF SUMMARY
FIELD OF ART

The present invention relates to a technique for laminating a resin film on a metallic sheet, and more particularly, a thermal transfer roll which provides portions where crystal orientation is held and portions where crystal orientation is not held on the resin film adhered to the metallic sheet, and a method for heating the metallic sheet by means of the thermal transfer roll, and an apparatus for producing a laminate plate with the thermal transfer roll.


BACKGROUND

Conventionally, a two piece can which is produced by integrally joining a can body with a can bottom has been popularly used for beverage cans and food cans. In general, these two piece cans are made of a substrate which is produced by laminating a resin film on a metallic sheet such as a steel sheet or an aluminum sheet. Namely, a portion of the two piece can where the can body and the can bottom are integrally merged is formed by applying a drawing, an ironing or a stretching to the laminate plate.
In such a forming, a denting is liable to occur at the bottom portion of the can so that the can bottom is required to have the enough denting resistance (an index that shows the resistance to the occurrence of crack to the resin film when the denting occurs at the can ). On the other hand, the can body portion is required to have a resistance to peeling off since the resin film is liable to be peeled off during the forming such as drawing.
For improving the denting resistance, it has been proposed to use bi-axially elongated and crystal oriented resin film. However, such a crystal oriented resin film tends to be peeled off easily at the time of drawing or ironing. Accordingly, it is desirable to use the laminated crystal oriented film at the bottom portion which is liable to be dented, while it is desirable to use the laminated film which has no crystal orientation at the can body portion.
As a device which meets the above-mentioned requirements, the applicant of the present invention has proposed a device 100 shown in FIG. 6 of producing a laminate plate adapted for the manufacturing of cans which are integrally provided with can bottom, which is disclosed in Japanese laid-open publication HEI 7-195651.
In operation of the device, a metallic sheet 101 is heated by a plurality of heating rolls 104 up to a temperature which is more than a temperature necessary for adhering of a resin film 102 but below a temperature lowring the degree of the crystal orientation.
Subsequently, while being applied a suitable tension by a tension roll 110, the above-mentioned metallic sheet 101 is made come into contact with a thermal transfer roll 105 which is a final heating roll. The thermal transfer roll 105 has a sufficiently high surface temperature to reduce the degree of crystal orientation of the resin film 102 and is provided with a plurality of indented portions 106 as shown in FIG. 7.
Portions of the metallic sheet which come into contact with the surface of the thermal transfer roll 105 is heated to the temperature which reduces the degree of crystal orientation of the resin film, while portions of the metallic sheet which face the indented portions 106 are not heated so that the portions are held at a temperature which does not reduce the degree of crystal orientation.
Thereafter, when the resin film 102 is adhered to the metallic sheet by means of a laminating roll 107 to produce the laminate plate 103, the resin film 102 with a reduced degree of crystal orientation is adhered to the portions of the metallic sheet which comes into contact with the surface of the thermal transfer roll 105 while the resin film 102 where the degree of crystal orientation is held unchanged is adhered to the portions which face the indented portions. The laminating roll 107 is pressed by a back-up roll 111 so as to tightfittingly adhere the resin film 102 to the metallic sheet 101.
A marking device 112 is provided for providing given marks on the laminate plate 103 to identify blanking positions which become necessary in subsequent blanking operation.
In F

REFERENCES:
patent: 3258386 (1966-06-01), Blythe
patent: 4050886 (1977-09-01), Moser
patent: 4105491 (1978-08-01), Haese et al.
patent: 5209283 (1993-05-01), Miltzow et al.
patent: 5292298 (1994-03-01), Scannell
patent: 5655596 (1997-08-01), Zaoralek
patent: 5659866 (1997-08-01), Kim

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