一種高強度警示帶用于替代傳統(tǒng)PVC警示帶，改善產(chǎn)品力學強度，提高產(chǎn)品耐用性，同時制品外觀獨特，穩(wěn)定性高又能節(jié)約材料成本。下面來講講生產(chǎn)工藝以及其步驟吧。

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.

原料采購：按照預計產(chǎn)量采購適量的高分子量的聚乙烯和聚丙烯，其中等規(guī)聚乙烯和等規(guī)聚丙烯的含量少應該大于各自重量份的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：將等量的聚乙烯和聚丙烯預先熔融混合，在控制溫度195°C_235°C下，將混合物料經(jīng)螺桿擠出機拉條切粒，冷卻成結晶聚烯烴樹脂，形成結晶乙烯-丙烯共聚物樹脂，該結晶聚烯烴樹脂熔融指數(shù)為不高于3g/10分鐘；將結晶聚烯烴樹脂75重量份放入高速攪拌機，室溫下加入玻璃纖維5重量份，硅酮I重量份，硼酸鋅1.5重量份，增塑劑0.5重量份，進行攪拌混合，每次加料時間間隔為5分鐘；

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-共擠：將配好的原料熔融后用單螺桿擠出機基礎，擠出溫度設定為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：將基礎的原料經(jīng)過流延單元上冷卻牽引輥滾動牽引，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;

型坯進入溫度為250°C-350°C的烘箱預熱，然后在150°C_180°C的拉伸烘箱內(nèi)進行單向拉伸，單向拉伸倍數(shù)控制為6-8倍，得到單向拉伸的成品；

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;

冷卻定型：通過兩個冷卻牽引輥對成品的兩個面進行風環(huán)冷卻；

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

分切：將成品通過切刀裝置將寬度方向兩側的廢料切除；

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

成品檢驗合格，收卷。

The finished product is qualified and reeled.

優(yōu)選的，增塑劑為鄰苯二甲酸二辛酯(DOP)。優(yōu)選的，步驟配料中加入5-10重量份的填料，填料為碳酸鈣或滑石粉。

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.

地埋警示帶廠家認為采用高分子量的聚乙烯與聚丙烯的共混合金，采用熔融共擠-單向拉伸工藝制備高強度警示帶，該方案傳統(tǒng)PVC警示帶的制備過程中易降解產(chǎn)生有毒氣體、產(chǎn)品易老化、發(fā)黃變色強度不佳等問題。

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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