BE多層共擠吹膜機沖料程序(精)

1、Purge procedure, materials and operating temperatures吹膜設備沖料程序Materialin the die 模頭內的原料Purge Material 沖洗原料Typical operat ing temperatures oC典型操作溫度Z1Z2 Z3Z4LDPEShut dow n layer/ li ne withLDPE 以 LDPE 關閉層或生產 線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，如第二天仍要運行，就不用沖 洗系統(tǒng)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. 在放入沖料原 料前升高溫度 10 度,沖洗原料 可以用是0.30.7MI 的 LDPE, 或 LDPE 和 TIE 各 50%比例 混合原料,對于混合原料，一開 始需要 50 公斤,然后繼續(xù)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 的混合料沖出 殘留的尼龍.對于共聚尼龍的 沖料程序類似，除了溫度通常 需低一點.2. Go to Shut dow n procedures 2.執(zhí)行關機程序 2EVOHUse 0.3 0.

5、7 MI LDPE; followsame procedure outlined forNylon.用 0.30.7MI 的 LDPE 與尼龍程 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 之后要運行 的原料撚后用 11.5 的 LDPE 作為轉變（過渡原料,在導入PP 前沖止沖清洗 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;以上操作溫度可以根據處理環(huán)境或再生料視應用等級進行調節(jié)Shut dow n procedures:關機程序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. 對于 PA EVOH 和 PET 原料在導入沖 洗原料前升高溫度 510 度，這將降低要沖洗的聚合物的粘性以避免當冷 卻的高粘性原料通過系統(tǒng)的表面凝固。對于聚烯烴原料，溫度不需要改 變。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.當壓力和氣泡不穩(wěn)定時，以高速運行擠出機（只對于難以沖洗的 原料層如；尼龍、EVOH PET）大約 10 分鐘，然后繼續(xù)以迪斯科沖料程序 進行，如；擠出機以 80rpm,運轉用 2 分鐘，然后擠出機以 30rpm,運轉 用 2 分鐘，反復多次交換進行，直至以前的原料完全被沖出。隨后開始對 一般不容易沖洗的其它層進行沖洗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.當看不出以前原料的痕跡時，在1520 分鐘之內降低擠出機和模頭的溫度，每次2025 度，直到溫度達到 120 度，隨著壓力的升高，降低了產量，以避免破裂轉盤故障和由于馬達超負荷而導致

13、擠出機停 機，當不能再維持氣泡狀態(tài)時，緩慢旋轉螺桿直至溫度達到建議值。關閉系統(tǒng)之 前，必需按照此步驟使將模頭溫度降至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 步驟后，停止擠出機，降低溫度至90 度，當擠出機溫度達到 90 度時