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    • 7. 发明申请
    • METHODS AND APPARATUS FOR FORMING TUBULAR CLOSED-ENDED ARTICLES OF THERMOFORMABLE POLYMER MATERIAL
    • 形成热塑性聚合物材料的管状封闭文章的方法和装置
    • WO1984003657A1
    • 1984-09-27
    • PCT/GB1984000078
    • 1984-03-13
    • METAL BOX P.L.C.DICK, David, AllanFOLLAND, RickworthSMITH, Desmond, PeterSTAINES, Glyn
    • METAL BOX P.L.C.
    • B29C17/03
    • B29C51/08B29C51/426Y10S264/901
    • A tubular article with a closed end is formed from a thermoformable polymer material, e.g. a high molecular weight saturated linear polyester such as polyethylene terephthalate, by forcing a punch (21) through the plane of a pre-heated and clamped sheet (13) of the polymer, centrally within an annular die (10) so as to draw the sheet into tubular form without exerting compressive stresses on the sheet between the punch and die, the punch being maintained at a temperature below the glass transition temperature of the polymer, e.g. by passing cooling fluid through internal passages (16), and being moved at a speed of at least 1/2 metre per second to effect the drawing. The punch head (21) may be convex or concave to produce a shaped closed end on the article, e.g. for making a pressure-resistant container, and the punch may co-operate with a shaped movable anvil (201) at the end or at an intermediate point in its stroke. Replaceable annular spacers (24) can be used to adjust the point in the punch stroke at which it co-operates with the anvil.
    • 具有封闭端的管状制品由可热成型的聚合物材料形成,例如, 高分子量饱和线性聚酯如聚对苯二甲酸乙二醇酯,通过迫使冲头(21)穿过聚合物的预加热和夹紧的片材(13)的平面,居中在环形模具(10)内,以便拉伸 片材变成管状,而不会在冲头和模具之间的片材上施加压应力,冲头保持在低于聚合物的玻璃化转变温度的温度,例如 通过冷却流体通过内部通道(16),并以每秒至少1/2米的速度移动以实现拉伸。 打孔头(21)可以是凸形或凹形的,以在制品上产生成形的封闭端,例如。 用于制造耐压容器,并且冲头可以在其行程的末端或中间点处与成形的活动砧座(201)配合。 可更换的环形间隔件(24)可用于调节冲头冲程中与砧座配合的点。