| 预热还可防止挤出中塑料因骤冷而残留内压力的作用 |
| 添加时间：2019/12/24 13:57:40 浏览次数： |
| 塑料挤出机组的辅机主要包括放线装置、校直装置、预热装置、冷却装置、牵引装置、计米器、火花试验机、收线装置。挤出机组的用途不同其选配用的辅助设备也不尽相同。如还有切断器、吹干器、印字装置等。 The auxiliary equipment of Plastic Extruder mainly includes setting out device, straightening device, preheating device, cooling device, traction device, meter counter, spark tester and take-up device. The purpose of extruder is different, and the auxiliary equipment is different. Such as cutter, dryer, printing device, etc. 校直装置：塑料挤出废品类型中最常见的一种是偏心，而线芯各种型式的弯曲则是产生绝缘偏心的重要原因之一。在护套挤出中，护套表面的刮伤也往往是由缆芯的弯曲造成的。因此，各种挤塑机组中的校直装置是必不可少。校直装置的主要型式有：滚筒式(分为水平式和垂直式);滑轮式(分为单滑轮和滑轮组);绞轮式，兼起拖动、校直、稳定张力等多种作用;压轮式(分为水平式和垂直式)等。 Straightening device: the most common type of plastic extrusion waste is eccentricity, and the bending of various types of wire core is one of the important reasons for insulation eccentricity. In the extrusion of sheath, the scratch of sheath surface is often caused by the bending of cable core. Therefore, the straightening device in all kinds of extrusion units is essential. The main types of straightening device are: roller type (divided into horizontal type and vertical type); pulley type (divided into single pulley and pulley block); winch type, which is also used for dragging, straightening, stabilizing tension, etc.; pressure wheel type (divided into horizontal type and vertical type), etc. 预热装置：缆芯预热对于绝缘挤出和护套挤出都是必要的。对于绝缘层，尤其是薄层绝缘，不能允许气孔的存在，线芯在挤包前通过高温预热可以彻底清除表面的水份、油污。对于护套挤出来讲，其主要作用在于烘干缆芯，防止由于潮气(或绕包垫层的湿气)的作用使护套中出现气孔的可能。预热还可防止挤出中塑料因骤冷而残留内压力的作用。 Preheating device: cable core preheating is necessary for insulation extrusion and sheath extrusion. For the insulating layer, especially the thin layer insulation, the existence of air holes cannot be allowed. The surface moisture and oil stain can be completely removed by high temperature preheating before the core is extruded. As for the sheath extrusion, its main function is to dry the cable core to prevent the possibility of air holes in the sheath due to the effect of moisture (or moisture around the cushion). Preheating can also prevent the residual internal pressure of plastics in extrusion due to sudden cooling. |
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