BE多层共挤吹膜机冲料程序

1、Purge procedure, materials and operating temperatures吹膜设备冲料程序Materialin thedie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 withLDPE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 go

2、ing 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 untilLLDPE is completelyout.用0.30.7MI 的 LDPE,直至 LLDPE完全清出205220210205NYLON1. Increase temps 10 degreesC before introducing purge235250255260resin. Purge resin may be 0.3 0.7 MI LDPE or blends

3、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.(PA 6227(PA 6,66232237243Procedure for PA6,66 is similar except the temperature

4、 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 2EVOHUse 0.3 0.7 MI LDPE; follow same procedure outli

5、ned forNylon. 用 0.30.7MI 的 LDPE 与 尼龙程序相同195205 210 210Tie MaterialUse 0.3 0.7 MILDPE用0.30.7MI 的LDPEPETUse 0.3 0.7 MI250260 260 260LDPE用0.30.7MI 的LDPEPPUse 0.3 0.7 MI LDPE, if PP200225 220 210is 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

6、 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 原料撚后用11.5的LDPE作为 转变（过渡原料，在导入PP前冲 止冲清洗 0.3LDMetalloceneSUse 0.3 0.7 MILDPE用0.30.7MI 的LDPE205220210205PVDCUse 2 MI LDPE用2MI的DPE150155155155Note: The above operating temperatures can be changed depending on processing

7、 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

8、 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,

9、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 minute3s0trhpemn s for twominutes. Repeat steps until all traces of previous materials are gone . Purging can begin lat

10、er for the other layers that are normally not difficult topurge. 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 如口；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

11、 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

12、 temperatures are at the suggested values. This procedure must be followed to get the dies below 200oC beforeshuttingpowerofftothesystem.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. W

13、hen 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 withpower onbut 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 闭电源