| 摘要 |
<p>A method for making a wave-shaped heating unit includes: a step of preparing a housing by compressing a metal tube to form an elongate tube 10 with an oval cross section; a step of inserting a soft heating plate 20 into the housing, two respective first ends of two wires 30 connected to the heating plate; a step of clamping by compressing the elongate tube to clamp the heating plate within the housing, two respective second ends of the two wires extending beyond the housing, and a step of forming wave-shape by, from one end of the housing, sequentially bending the housing into continuous convex portions 42 and concave portions 44. The ends of the housing may be left unsealed till after the bending step (fig 12 not shown)</p> |
