BE多層共擠吹膜機(jī)沖料程序

1、Purge procedure, materials and operating temperatures吹膜設(shè)備沖料程序Materialin thedie模頭內(nèi)的原料Purge Material 沖洗原料Typical operating temperatures oC典型操作溫度Z1Z2Z3Z4LDPEShut down layer/ line withLDPE以LDPE關(guān)閉層或生產(chǎn)線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 運(yùn)行,就不用沖洗系統(tǒng)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”沖料程序后,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(diǎn) .2. Go to Shut down procedures 2 .執(zhí)行關(guān)機(jī)程序 2EVOHUse 0.3 0.7 MI LDPE; follow same procedure outli

5、ned forNylon. 用 0.30.7MI 的 LDPE 與 尼龍程序相同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 運(yùn)行的 原料撚后用11.5的LDPE作為 轉(zhuǎn)變（過渡原料，在導(dǎo)入PP前沖 止沖清洗 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;以上操作溫度可以根據(jù)處理環(huán)境或再生料視應(yīng)用等級進(jìn)行調(diào)節(jié)Shut down procedures: 關(guān)機(jī)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.對于PA、EVOH和PET原料在導(dǎo)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(dāng)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 （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. 當(dāng)壓力和氣泡不穩(wěn)定時，以高速運(yùn)行擠出機(jī)（只對于難以沖洗的原料 層 如口；尼龍、EVOH、PET）大約10分鐘，然后繼續(xù)以迪斯科沖料程序進(jìn)行，如；擠 出機(jī)以80rpm，運(yùn)轉(zhuǎn)用2分鐘，然后擠出機(jī)以30rpm，運(yùn)轉(zhuǎn)用2分鐘，反復(fù) 多次 交換進(jìn)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(jìn)行沖洗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.當(dāng)看不出以前原料的痕跡時，在1520分鐘之內(nèi)降低擠出機(jī)和模頭的溫度，每 次2025度，直到溫度達(dá)到120度，隨著壓力的 升高，降低了產(chǎn)量，以避免破裂轉(zhuǎn)盤故 障 和由于 馬達(dá)超負(fù)荷而導(dǎo)致擠出機(jī)停機(jī)，當(dāng)不能再維持氣泡狀態(tài)時，緩慢旋轉(zhuǎn)螺桿 直至 溫度達(dá)到建議值。關(guān)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. 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 驟后，停止擠出機(jī)，降低溫度至 90度，當(dāng)擠出機(jī)溫度達(dá)到90度時 關(guān) 閉電源