公园游乐机具的扶手，无论是木制还是金属制的，都有缺欠。前者需要达到一定粗度，才能保证强度；后者的粗度可以细化，强度也高，但手感不良，炎夏烫手，严冬冰手。于是，一种兼有两者优越性的材料应运而生。这就是木材和金属复合管（以下简称复合管）。简单说，复合管是利用 Handrails for park play equipment, whether wood or metal, have defects. The former needs to reach a certain degree of roughness in order to ensure the strength; the latter’s thickness can be refined, the intensity is also high, but the feel is bad, hot summer, ice winter hands. Thus, a material that combines the advantages of both comes into being. This is a wood and metal composite pipe (hereinafter referred to as a composite pipe). In simple terms, the composite pipe is used