BE多层共挤吹膜机冲料程序(精)

1、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 operat ing temperatures oC典型操作温度Z1Z2 Z3Z4LDPEShut dow n layer/ li ne withLDPE 以 LDPE 关闭层或生产 线180200195200HDPEUse 0.3 0.5 MI LDPE un tilLLDPE is completely out. No need to purge system if

2、HDPE isgoing 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205220 210 205LLDPEUse 0.3 0.7 MI LDPE un tilLLDPE is completely out. 用0.30.7MI 的 LDPE,直至 LLDPE完全清出205220 210 205NYLON1. In crease temps 10 degrees Cbefore in troduc ing235250 255 260purge res in. Purge res in maybe

3、0.3 0.7 MI LDPE or ble ndsof LDPE and Tie at 50/50 ratio.For blend, about 50kg isrequired in itially the n con ti nuewith LDPE un til complete. Aftercomplet ing disco purgeprocess, add(PA 6227(PA 6,66232 237 243about 15 kg ble nd of Tie and LDPE to flush out any remai ning PA.Procedure for PA6,66 is

4、 similar except the temperature profiles arenormally 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”中料程序后，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 dow n procedures 2.执行关机程序 2EVOHUse 0.3 0.

5、7 MI LDPE; followsame procedure outlined forNylon.用 0.30.7MI 的 LDPE 与尼龙程 序相同195205210 210Tie MaterialUse 0.3 0.7 MI LDPE 用0.30.7MI 的 LDPEPETUse 0.3 0.7 MI LDPE 用0.30.7MI 的 LDPE250260260 260PPUse 0.3 0.7 MI LDPE, if PP200225220 210is the n ext material to be run after 0.3 0.7 MI LDPE, then use 1-1.5L

6、DPE as the transition material to purge out the 0.3 LD before PP isintroduced.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 0.3LDMetalloce neS Use 0.3 0.7 MI LDPE 用 2050.30.7MI 的 LDPE220 210 205PVDCUse 2 MI LDPE 用 2MI 的 150 DPE155 155 155Note: The above operati

7、ng temperatures can be changed depending on process ing conditi ons, and grades of res ins and applicati ons.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 dow n procedures:关机程序1. Before in troduc ing the purge material in crease the temperatures 510oCfor PA, EVOH and PET res ins. This will lower the viscosity

8、of the polymersbeing purged to avoid wetted-surface freez ing whe n the cooler higher viscosityresin passes over the system. For Polyolefin resins, temperature change is notnecessary. 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 （on ly

9、 for the layers with the difficult-to-purge resins such asPA, EVOH and PET at the highest rate possible for about 10 minutes limitedonly by pressure and bubble in stability. Con ti nue the process with discopurging. e.g. Ext at 80 rpm s for two minutes then 30 rpmminutes. Repeat steps until all trac

10、es of previous materials are gone . Purg ingcan beg in later for the other layers that are n ormally 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s for two3. When

11、no more trace of the previous material is visible, decrease the extruder and dietemperatures in in creme nts of 20 to 25oC for 15 to 20minutes untiltemps reach 120oC. Reduce output as pressure builds toavoid failure of rupture discs and stoppage of extruders due to motor over loads. When itis no Ion

12、 ger possible to maintain a bubble, rotatethe screws slowly untilthe temperatures are at the suggested values.This procedure must be followed to get the dies below 200oC before shutting power off tothe 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

13、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 temperaturesto 90oC. Shut the power off whe n the extruders are at 90oC.（If the planned shut down is with power on but for more than 12 hours, leave systemtemperature at 60oC. The die temperature can be higher tha n 100oC at this pointbecause of its mass and the fact thatthere 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