CN103788449A - 一种塑料薄膜的加工工艺 - Google Patents
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Abstract
本发明公开了一种塑料薄膜的加工工艺,其工艺步骤为:(1)制作塑料薄膜材料选择;选择高密度聚乙烯90%与低密度聚乙烯10%的混合聚乙烯材料作为制作箱体与箱盖的材料,所述高密度聚乙烯的密度为0.942~0.965g/cm3,所述低密度聚乙烯的密度为0.890~0.915g/cm3;(2)材料的混合熔融;(3)初步挤出成型;(4)压延成型;(5)进一步拉伸成型;(6)软棒安放;(7)冷却并最终成型;本发明将高度密聚乙烯与低密度聚乙烯混合作原材料,使塑料薄膜在抗张力与抗拉伸强度间达到最佳平衡,同时,在材料中加入了铝酸锶其为荧光粉的化学成分,夜间发出荧光对动物起警示作用,避免靠近损坏大棚薄膜,塑料薄膜厚度比市面薄膜更更薄,利于光线透射入内,农作物能更好的进行光合作用,提高农作物产量,此薄膜耗材少而利用率高,适应市场需求。
Description
技术领域
本发明涉及塑料薄膜的制作领域,特别是涉及一种塑料薄膜的加工工艺。
背景技术
随着社会的发展,塑料薄膜行业也在不断发展壮大,在农业、食品包装、医药卫生、机电等各行各业均有应用,尤其在农业上塑料薄膜的应用更加广泛,解决了我国农业上农副产品供应不足的弊端。
我国是一个农业大国,农业种植各种蔬菜水果需要大量的塑料薄膜,传统的塑料薄膜厚度多为0.08-0.12mm,厚度较厚,用作大棚膜不利于植物光合作用,而且,此类薄膜抗老化作用差,易被各种田间动物撕破咬烂,夜间也不能发出荧光,不能对动物起警示作用。且传统薄膜上未设橡胶软棒,薄膜不能折整齐折叠,不利于保管,如申请号为200910041868.5的文件公开了一种防滑塑料薄膜的制造工艺以及防滑塑料薄膜,工艺包括:通过各料道分别向模头供给至少两种材料,其中:形成塑胶薄膜外层的材料的熔解温度最高,形成塑胶薄膜外层的材料的冷却速度低于与其相邻层的材料的冷却速度;在所述各料道中熔融所述各材料,使外层的材料处于不完全熔融的颗粒状态,其他各层材料处于完全熔融状态;在所述模头处将所述各材料进行共挤吹膜;冷却,得到成型的塑料薄膜,设计复杂,但薄膜不能警示动物,不能折叠不易保管且厚度没有特殊考虑,不能有效利用光照来提高农作物产量。
现有的塑料薄膜种类较多,虽然它们具有各自的特性,但使用领域均有限,也存在着各自的缺陷。
发明内容
为克服现有技术上的不足,本发明目的是提供一种在夜间可发出荧光的塑料薄膜,同时在在塑料薄膜中间设有橡胶材质的软棒的塑料薄膜的加工工艺,其工艺合理、简洁。
为实现本发明的目的,本发明的技术方案如下:
一种塑料薄膜的加工工艺,其工艺步骤如下:
(1)制作塑料薄膜材料选择;选择高密度聚乙烯10%与低密度聚乙烯90%的混合聚乙烯材料作为制作塑料薄膜的材料,所述高密度聚乙烯的密度为0.942~0.965 g/cm3,所述低密度聚乙烯的密度为0.890~0.915 g/cm3。
(2)材料的混合熔融;将步骤(1)中选择的聚乙烯材料与铝酸锶及2,6-二叔丁基对甲酚按9:0.5:0.5的质量比充分搅拌混合均匀,加热至熔融状态;
(3)初步挤出成型;将步骤(2)中熔融后的材料用塑料挤出机挤出成型;
(4)压延成型;用压延机压延步骤(3)中挤出成型的材料,压延后的厚度为0.3-0.8mm;
(5)进一步拉伸成型;用加热装置将(4)中所述压延后的薄膜加热并拉伸,拉伸后厚度为0.03-0.08mm;
(6)软棒安放;所述步骤(5)加热过程中在塑料薄膜上每隔一米宽处设一软棒;
(7)冷却并最终成型;将步骤(6)中塑料薄膜在室温下逐渐冷却,最终成型。
上述一种塑料薄膜的加工工艺,其中,所述步骤(2)中,所述加热至熔融状态的加热温度为200-220℃。
上述一种塑料薄膜的加工工艺,其中,所述步骤(5)中,所述进一步拉伸成型加热装置温度设为160-170℃。
进一步的,所述步骤(6)中,所述的软棒为天然橡胶材质。柔韧性好,有利于收卷薄膜过程中灵活卷曲折叠,同时,天然橡胶为一种防腐材料,延长塑料薄膜使用寿命,提高塑料薄膜使用效率。
本发明通过上述工艺制作的塑料薄膜,运用了高度密聚乙烯与低密度聚乙烯混合应用,使塑料薄膜在抗张力与抗拉伸强度间达到最佳平衡。同时,在材料中加入了铝酸锶,其为荧光粉的化学成份,夜间塑料薄膜可发出荧光,对周边动物起到警示作用,避免动物撕扯损坏大棚薄膜。
本发明塑料薄膜经压延并拉伸后厚度为0.03-0.08mm,此厚度薄膜比市面塑料薄膜更薄,有利于光线透射入内,农作物能更好的进行光合作用,提高农作物产量,此薄膜耗材少而利用率高,适应市场需求。
具体实施方式
为使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解,下面结合具体实施方式,进一步阐述本发明。
实施例1:
本实施例的一种塑料薄膜的加工工艺,其工艺步骤如下:
(1)制作塑料薄膜材料选择;选择高密度聚乙烯10%与低密度聚乙烯90%的混合聚乙烯材料作为制作塑料薄膜的材料,所述高密度聚乙烯的密度为0.942g/cm3,所述低密度聚乙烯的密度为0.890 g/cm3;
(2)材料的混合熔融;将步骤(1)中选择的聚乙烯材料与铝酸锶及2,6-二叔丁基对甲酚按9:0.5:0.5的质量比充分搅拌混合均匀,加热至熔融状态,所述加热至熔融状态的加热温度为200℃;
(3)初步挤出成型;将步骤(2)中熔融后的材料用塑料挤出机挤出成型;
(4)压延成型;用压延机压延步骤(3)中挤出成型的材料,压延后的厚度为0.3mm;
(5)进一步拉伸成型;使用加热装置,将加热装置温度设定为160℃,将(4)中所述压延后的薄膜加热并拉伸,拉伸后厚度为0.03mm;
(6)软棒安放;所述步骤(5)加热过程中在塑料薄膜上每隔一米宽处设一天然橡胶软棒;
(7)冷却并最终成型;将步骤(6)中塑料薄膜在室温下逐渐冷却,最终成型。
实施例2:与实施例1不同之处在于,步骤(1)中所述高密度聚乙烯的密度为0.955g/cm3,所述低密度聚乙烯的密度为0.905g/cm3,步骤(2)中,加热至熔融状态的加热温度为210℃,步骤(4)中薄膜压延后的厚度为0.55mm,步骤(5)中所述进一步拉伸成型加热装置温度设为165℃,薄膜进一步拉伸后厚度为0.055mm。
实施例3:与实施例1不同之处在于,步骤(1)所述高密度聚乙烯的密度为0.965g/cm3,所述低密度聚乙烯的密度为0.915g/cm3,步骤(2)中加热至熔融状态的加热温度为220℃,步骤(4)中薄膜压延后的厚度为0.8mm,步骤(5)中所述进一步拉伸成型加热装置温度设为170℃,薄膜进一步拉伸后厚度为0.08mm。
上述三个实施例中:
实施例1 | 实施例2 | 实施例3 | 结果 | |
用力拉扯塑料薄膜 | 60牛顿力 | 70牛顿力 | 80牛顿力 | 实施例1、2中塑料薄膜扯破,实施例3中塑料薄膜未破损 |
冬季用塑料薄膜作大棚,在棚内种植白菜 | 10天 | 15天 | 20天 | 实施例1中白菜高度为20cm,实施例2中白菜高度为16cm,实施例3中白菜高度为15cm |
本发明通过上述工艺制作的塑料薄膜,运用了高度密聚乙烯与低密度聚乙烯混合应用,使塑料薄膜在抗张力与抗拉伸强度间达到最佳平衡。同时,在材料中加入了铝酸锶,其为荧光粉的化学成份,夜间塑料薄膜可发出荧光,对周边动物起到警示作用,避免动物撕扯损坏大棚薄膜。
本发明塑料薄膜经压延并拉伸后厚度为0.03-0.08mm,此厚度薄膜比市面塑料薄膜更薄,有利于光线透射入内,农作物能更好的进行光合作用,提高农作物产量,此薄膜耗材少而利用率高,适应市场需求。
以上所述仅为本发明的实施例,并非因此限制本发明的专利范围,凡是利用本发明说明书内容所作的等效结构或等效流程变换,或直接或间接运用在其他相关的技术领域,均同理包括在本发明的专利保护范围内。
Claims (4)
1.一种塑料薄膜的加工工艺,其特征在于,其工艺步骤如下:
(1)制作塑料薄膜材料选择;选择高密度聚乙烯10%与低密度聚乙烯90%的混合聚乙烯材料作为制作塑料薄膜的材料,所述高密度聚乙烯的密度为0.942~0.965 g/cm3,所述低密度聚乙烯的密度为0.890~0.915 g/cm3;(2)材料的混合熔融;将步骤(1)中选择的聚乙烯材料与铝酸锶及2,6-二叔丁基对甲酚按9:0.5:0.5的质量比充分搅拌混合均匀,加热至熔融状态;
(3)初步挤出成型;将步骤(2)中熔融后的材料用塑料挤出机挤出成型;
(4)压延成型;用压延机压延步骤(3)中挤出成型的材料,压延后的厚度为0.3-0.8mm;
(5)进一步拉伸成型;用加热装置将(4)中所述压延后的薄膜加热并拉伸,拉伸后厚度为0.03-0.08mm;
(6)软棒安放;所述步骤(5)加热过程中在塑料薄膜上每隔一米宽处设一软棒;
(7)冷却并最终成型;将步骤(6)中塑料薄膜在室温下逐渐冷却,最终成型。
2.根据权利要求1所述的塑料薄膜的加工工艺,其特征在于,所述步骤(2)中,所述加热至熔融状态的加热温度为200-220℃。
3.根据权利要求1所述的塑料薄膜的加工工艺,其特征在于,所述步骤(5)中,所述加热装置温度设为160-170℃。
4.根据权利要求1所述的塑料薄膜的加工工艺,其特征在于,所述步骤(6)中,所述的软棒为天然橡胶材质。
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CN104985785A (zh) * | 2015-06-09 | 2015-10-21 | 无锡佳泰科技有限公司 | 一种共混薄膜的加工工艺 |
CN111258178A (zh) * | 2018-12-03 | 2020-06-09 | 信越化学工业株式会社 | 防尘薄膜组件及其制造方法 |
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CN103613825A (zh) * | 2013-11-08 | 2014-03-05 | 苏州市双赢包装材料有限公司 | 一种利用混合聚乙烯材料制作塑料薄膜的加工工艺 |
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CN103613825A (zh) * | 2013-11-08 | 2014-03-05 | 苏州市双赢包装材料有限公司 | 一种利用混合聚乙烯材料制作塑料薄膜的加工工艺 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104985785A (zh) * | 2015-06-09 | 2015-10-21 | 无锡佳泰科技有限公司 | 一种共混薄膜的加工工艺 |
CN111258178A (zh) * | 2018-12-03 | 2020-06-09 | 信越化学工业株式会社 | 防尘薄膜组件及其制造方法 |
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