PURPOSE: To restrict a reduction in heating surface area and an increase in pressure loss and prevent defective adhesion from occurring at the time of lamination, by a method wherein when forming a groove, a part for increasing bond strength is left only at a connecting part of a header part and a passage.
CONSTITUTION: When providing a flat plate 9 with a groove part 10, a projected part 12 is left at the connecting part of the groove part 10 and a header 11, the height of the part 12 being equal to the height of side walls 13 of the groove. Accordingly, when integrating by lamination, not only the side walls 13 but the projected parts 12 are pressed, whereby a sufficient bond strength is obtained over the entire width of the groove part 10, and perfect adhesion is achieved. The length of the projected part 12 may be equal to the width of side walls of the adjacent flat plate, so that it is not so large, the part 12 produces little effect on the fluid, and an increase in pressure loss is slight. In addition, since the projected parts 12 are small, defective adhesion can be avoided without considerably affecting the heating surface area.
TAKESHITA ISAO
HARADA TSUTOMU
| JPS57122296A | 1982-07-30 |
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