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    2. PE系列的三層共擠自粘膜配方問題,現將有關配方設置和注意事項發表如下(注意:此貼是網上查找的,實際效果還待實踐);

            1,外層:          C6/C8LLDPE                 80KG;

                                  mLLDPE                        20KG;

                                  PIB                             2 --4KG.

       

            2,中層:         EVA                             60kg

                                 C6/C8LLDPE               40KG;

       

            3,內層:            C6/C8LLDPE            80KG;

                                     LDPE                         20KG;

                                     防霧劑                       1.5kg.

            4,層次比例為30/40/30,分別為自粘層,過渡層和內層防結露層.

            5,配方中增粘劑(PIB)及防霧劑,應分別制成母料后加入.

            6,工藝條件:

                    擠出機的長徑比為                                       25-28;

                    擠出機加熱溫度                     加熱段          150度;

                                                                    塑化段          180-190 度;

                                                                   計量段             200-210度;

                   摸頭加熱溫度                                              210-220度;

                   口模間隙                                                      1.2-1.5mm;

                   吹漲比                                                           2.5-3;

                   膜卷貯藏溫度                                               10-40度;

      注意事項:晶點問題和不透明問題和螺桿轉速和口模加熱溫度有關,一要將轉速逐步提高到60-70左右,口摸加熱溫度保證在200以上調整.
       


       

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