Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1984-06-25
1986-08-12
Dawson, Robert A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156229, 156324, 156555, B32B 3108
Patent
active
046054588
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a method of pressure bonding composite materials, particularly applicable to the pressure bonding of a pair of strips.
BACKGROUND OF THE PRIOR ART
The conventional practice of pressure bonding includes passing a pair of strips in superimposed condition between a pair of abutting rolls which rotate in opposite directions with an equal peripheral speed, thereby integrally bonding the strips together under the influence of the pressure applied by the rolls. However, according to this procedure, the draft of each strip is uniquely determined by the resistance to deformation, the diameter of each roll or the load per unit area of each strip, and hence it is necessary to change the ratio of diameters of the abutting rolls in order to adjust the draft of each strip, which is a toublesome operation.
DISCLOSURE OF THE INVENTION
It is an object of the invention to provide a method of pressure bonding composite materials which permits the draft of each strip to be controlled without changing abutting rolls, by merely changing the peripheral speed thereof.
In accordance with the invention, there is provided a method of pressure bonding composite materials in which a pair of strips are passed through a nip between a pair of counterrotating abutting rolls. This method is characterized in that at least one of composite material which has passed through the nip and a strip which is to be introduced into the nip is wrapped around the roll, and the pair of abutting rolls are driven at different peripheral speeds while both the composite material and the strip are situated between the rolls. By adjusting the ratio of peripheral speeds of the pair of abutting rolls, the draft of each strip can be changed.
According to the method of the invention, at least one of the composite material and the strip is wrapped around one of the abutting rolls, and hence the control of the tension applied to either the composite material or the strip to maintain its neutral position at a given location and thereby to allow a stabilized bonding process is facilitated.
It is another object of the invention to facilitate the application of such method to a strip such as a thick backing steel plate which is difficult to be bent.
While one of the strips is wrapped around one of the abutting rolls, the other strip having an increased thickness as well as the composite material, formed by the both strips integrally bonded together, are passed through the nip without being substantially wrapped about the roll, whereby the strip having an increased thickness can be conveyed along a straight path.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view of the overall arrangement according to one embodiment of the invention;
FIG. 2 graphically illustrates the relationships between the ratio of peripheral speeds on one hand and the draft of the first and the second strip (R1, R2) and the relative slip (Rs) prevailing in the embodiment of FIG. 1, on the other;
FIG. 3 is a similar graph to FIG. 2, illustrating corresponding relationships when different materials are used;
FIG. 4 is a schematic view of the overall arrangement according to another embodiment of the invention;
FIG. 5 graphically illustrates a series of relationships prevailing between the ratio of peripheral speeds and the draft of strips (R1, R2) which occur in the embodiment of FIG. 4; and
FIG. 6 graphically shows relationships between the hardness of a backing used as a second strip and the ratio of peripheral speeds which occur in the embodiment of FIG. 4.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIG. 1, there are shown a first and a second strip 1, 2 which are paid off a pair of supply reels 3, 4, respectively. The first strip is directly supplied from reel 3 into a nip or gap g defined between a pair of abutting rolls 5, 6 while the other or second strip 2 is wrapped around the second roll 6 before it is supplied into the nip g between the rolls 5, 6. The pair of abutting rolls 5, 6 bond the first and the second strip
REFERENCES:
patent: 3081212 (1963-03-01), Taylor et al.
patent: 3901758 (1975-08-01), Humphries
patent: 3951727 (1976-04-01), Greenberg
patent: 4069081 (1978-01-01), Drower et al.
patent: 4470589 (1984-09-01), Singer
patent: 4517042 (1985-05-01), Singer
Dawson Robert A.
Taiho Kogyo Co. Ltd.
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