BE多层共挤吹膜机冲料程序

Purge procedure, materials and operating temperatures吹膜设备冲料程序Materialin the die模头内的原料Purge Material冲洗原料Typical operating temperatures oC典型操作温度Z1Z2Z3Z4LDPEShut down layer/ line with LDPE以LDPE关闭层或生产线180200195200HDPEUse 0.3 0.5 MI LDPE until LLDPE is completely out. No need to purge system if HDPE is going to be run the next day使用0.30.5MI的LDPE直至LLDPE完全清出,如第二天仍要运行,就不用冲洗系统205220210205LLDPEUse 0.3 0.7 MI LDPE until LLDPE is completely out.用0.30.7MI的LDPE,直至LLDPE完全清出205220210205NYLON1. Increase temps 10 degrees C before introducing purge resin. Purge resin may be 0.3 0.7 MI LDPE or blends of LDPE and Tie at 50/50 ratio. For blend, about 50kg is required initially then continue with LDPE until complete. After completing disco purge process, add about 15 kg blend of Tie and LDPE to flush out any remaining PA. Procedure for PA6,66 is similar except the temperature profiles are normally lower. 在放入冲料原料前升高温度10度,冲洗原料可以用是0.30.7MI的LDPE,或LDPE和TIE各50%比例混合原料,对于混合原料,一开始需要50公斤,然后继续使用LDPE直至完全清出,完成”迪斯科”冲料程序后,加入15公斤Tie和LDPE的混合料冲出残留的尼龙.对于共聚尼龙的冲料程序类似,除了温度通常需低一点.2. Go to Shut down procedures 2.执行关机程序2235(PA 6227(PA 6,66250232255237260243EVOHUse 0.3 0.7 MI LDPE; follow same procedure outlined for Nylon.用0.30.7MI的LDPE与尼龙程序相同195205210210Tie MaterialUse 0.3 0.7 MI LDPE用0.30.7MI的LDPEPETUse 0.3 0.7 MI LDPE用0.30.7MI的LDPE250260260260PPUse 0.3 0.7 MI LDPE, if PP is the next material to be run after 0.3 0.7 MI LDPE, then use 1-1.5 LDPE as the transition material to purge out the 0.3 LD before PP is introduced. 用0.30.7MI的LDPE,如果PP是0.30.7MILDPE之后要运行的原料,然后用11.5的LDPE作为转变(过渡原料,在导入PP前冲止冲清洗0.3LD200225220210MetalloceneSUse 0.3 0.7 MI LDPE用0.30.7MI的LDPE205220210205PVDCUse 2 MI LDPE用2MI的DPE150155155155Note: The above operating temperatures can be changed depending on processing conditions, and grades of resins and applications.注意;以上操作温度可以根据处理环境或再生料视应用等级进行调节Shut down procedures:关机程序1. Before introducing the purge material increase the temperatures 510oC for PA, EVOH and PET resins. This will lower the viscosity of the polymers being purged to avoid wetted-surface freezing when the cooler higher viscosity resin passes over the system. For Polyolefin resins, temperature change is not necessary. 对于PA、EVOH和PET原料在导入冲洗原料前升高温度510度，这将降低要冲洗的聚合物的粘性以避免当冷却的高粘性原料通过系统的表面凝固。对于聚烯烃原料，温度不需要改变。2. Run extruders (only for the layers with the difficult-to-purge resins such as PA, EVOH and PET at the highest rate possible for about 10 minutes limited only by pressure and bubble instability. Continue the process with disco purging. e.g. Ext at 80 rpms for two minutes then 30 rpms for two minutes. Repeat steps until all traces of previous materials are gone. Purging can begin later for the other layers that are normally not difficult to purge.当压力和气泡不稳定时，以高速运行挤出机（只对于难以冲洗的原料层如；尼龙、EVOH、PET）大约10分钟，然后继续以迪斯科冲料程序进行，如；挤出机以80rpm，运转用2分钟，然后挤出机以30rpm，运转用2分钟，反复多次交换进行，直至以前的原料完全被冲出。随后开始对一般不容易冲洗的其它层进行冲洗3. When no more trace of the previous material is visible, decrease the extruder and die temperatures in increments of 20 to 25oC for 15 to 20 minutes until temps reach 120oC. Reduce output as pressure builds to avoid failure of rupture discs and stoppage of extruders due to motor over loads. When it is no longer possible to maintain a bubble, rotate the screws slowly until the temperatures are at the suggested values. This procedure must be followed to get the dies below 200oC before shutting power off to the system.当看不出以前原料的痕迹时，在1520分钟之内降低挤出机和模头的温度，每次2025度，直到温度达到120度，随着压力的升高，降低了产量，以避免破裂转盘故障和由于马达超负荷而导致挤出机停机，当不能再维持气泡状态时，缓慢旋转螺杆直至温度达到建议值。关闭系统之前，必需按照此步骤使将模头温度降至200度以下。4. When procedures 1-3 are completed, stop the extruders and decrease temperatures to 90oC. Shut the power off when the extruders are at 90oC. (If the planned shut down is with power on but for more than 12 hours, leave system temperature at 60oC. The die temperature can be higher than 100oC at this point because of its mass and the fact that there is no cooling.完成13步骤后，停止挤出机，降低温度至90度，当挤出机温度达到90度时关