一种高强度警示带用于替代传统PVC警示带，改善产品力学强度，提高产品耐用性，同时制品外观独特，稳定性高又能节约材料成本。下面来讲讲生产工艺以及其步骤吧。

A high-strength warning tape is used to replace the traditional PVC warning tape, improve the mechanical strength of the product and improve the durability of the product. At the same time, the product has unique appearance, high stability and can save material costs. Let's talk about the production process and its steps.

原料采购：按照预计产量采购适量的高分子量的聚乙烯和聚丙烯，其中等规聚乙烯和等规聚丙烯的含量少应该大于各自重量份的60%;

Purchase of raw materials: purchase an appropriate amount of high molecular weight polyethylene and polypropylene according to the estimated output, in which the content of isotactic polyethylene and isotactic polypropylene should be at least greater than 60% of their respective parts by weight;

配料：将等量的聚乙烯和聚丙烯预先熔融混合，在控制温度195°C_235°C下，将混合物料经螺杆挤出机拉条切粒，冷却成结晶聚烯烃树脂，形成结晶乙烯-丙烯共聚物树脂，该结晶聚烯烃树脂熔融指数为不高于3g/10分钟；将结晶聚烯烃树脂75重量份放入高速搅拌机，室温下加入玻璃纤维5重量份，硅酮I重量份，硼酸锌1.5重量份，增塑剂0.5重量份，进行搅拌混合，每次加料时间间隔为5分钟；

Ingredients: melt and mix the same amount of polyethylene and polypropylene in advance, and control the temperature at 195 ° C_ At 235 ° C, the mixed material is stretched and diced by a screw extruder, cooled into crystalline polyolefin resin to form crystalline ethylene propylene copolymer resin, and the melt index of the crystalline polyolefin resin is not higher than 3G / 10 minutes; Put 75 parts by weight of crystalline polyolefin resin into a high-speed mixer, add 5 parts by weight of glass fiber, 1.5 parts by weight of silicone I, 1.5 parts by weight of zinc borate and 0.5 parts by weight of plasticizer at room temperature, and mix them. The interval between each feeding is 5 minutes;

熔融-共挤：将配好的原料熔融后用单螺杆挤出机基础，挤出温度设定为1950C-2100C；

Melting coextrusion: melt the prepared raw materials and use the single screw extruder as the base. The extrusion temperature is set to 1950c-2100c;

流延成型：将基础的原料经过流延单元上冷却牵引辊滚动牵引，得到型坯；

Tape casting: the basic raw materials are rolled and pulled by the cooling traction roller on the tape casting unit to obtain the parison;

型坯进入温度为250°C-350°C的烘箱预热，然后在150°C_180°C的拉伸烘箱内进行单向拉伸，单向拉伸倍数控制为6-8倍，得到单向拉伸的成品；

The parison is preheated in an oven with a temperature of 250 ° c-350 ° C, and then heated at 150 ° C_ Unidirectional stretching is carried out in a 180 ° C stretching oven, and the unidirectional stretching multiple is controlled to be 6-8 times to obtain the unidirectional stretched finished product;

冷却定型：通过两个冷却牵引辊对成品的两个面进行风环冷却；

Cooling and shaping: the two surfaces of the finished product are cooled by air rings through two cooling traction rollers;

分切：将成品通过切刀装置将宽度方向两侧的废料切除；

Slitting: cut the waste materials on both sides of the width direction through the cutter device;

成品检验合格，收卷。

The finished product is qualified and reeled.

优选的，增塑剂为邻苯二甲酸二辛酯(DOP)。优选的，步骤配料中加入5-10重量份的填料，填料为碳酸钙或滑石粉。

Preferably, the plasticizer is dioctyl phthalate (DOP). Preferably, 5-10 parts by weight of filler is added to the step ingredients, and the filler is calcium carbonate or talc powder.

地埋警示带厂家认为采用高分子量的聚乙烯与聚丙烯的共混合金，采用熔融共挤-单向拉伸工艺制备高强度警示带，该方案传统PVC警示带的制备过程中易降解产生有毒气体、产品易老化、发黄变色强度不佳等问题。

The manufacturers of buried warning tapes believe that the high-strength warning tapes are prepared by using the blend alloy of high molecular weight polyethylene and polypropylene and the melting coextrusion unidirectional stretching process. This scheme solves the problems of easy degradation and toxic gas, easy aging of products, poor yellowing and discoloration strength of traditional PVC warning tapes in the preparation process.

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