CN111873360A - 一种pe薄膜防气泡成形工艺 - Google Patents

一种pe薄膜防气泡成形工艺 Download PDF

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CN111873360A
CN111873360A CN202010498225.XA CN202010498225A CN111873360A CN 111873360 A CN111873360 A CN 111873360A CN 202010498225 A CN202010498225 A CN 202010498225A CN 111873360 A CN111873360 A CN 111873360A
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film
zone
layer
raw material
density polyethylene
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叶智
叶勇
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Shenzhen Fengzhao New Material Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92657—Volume or quantity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92942—Moulded article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92961—Auxiliary unit, e.g. for external melt filtering, re-combining or transfer between units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0633—LDPE, i.e. low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets

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Abstract

本发明公开了一种PE薄膜防气泡成形工艺，采用三层共挤吹膜机生产，其中外层原材料包括茂金属聚乙烯，中层原材料包括低密度聚乙烯，内层原材料包括低密度聚乙烯；内层、中层和外层的挤出体积百分比分别为46％、46％和8％；并对内层、中层和外层的主机一区、二区、三区、四区、换网和流道的设定温度、以及模头各区的设定温度进行优化设计，使PE薄膜的原材料配方更加简化、生产操作更加稳定，并且生产的PE薄膜厚度可以低至0.03mm，成形的PE薄膜塑化良好，表面平整光滑无皱折、无气泡和穿孔破裂。

Description

一种PE薄膜防气泡成形工艺
技术领域
本发明属于领域，具体地讲，特别涉及一种PE薄膜防气泡成形工艺。
背景技术
PE静电膜是一种不涂胶膜，靠本身静电吸附粘着在物品上起保护作用，一般多用于对胶黏剂或者胶水残留比较敏感的表面，多用于玻璃，镜片，高光塑胶面，亚克力等非常光滑的表面。现有的PE静电膜主要采用吹塑法生产，通过将原材料挤成薄管，然后趁热用压缩空气将塑料吹胀，再经冷却定型后而得到筒状的薄膜制品。
目前，针对PE静电膜的生产研发，一方面集中在一些特殊使用场景的新产品开发，比如耐高温PE静电膜、具有优良印刷性能的PE静电膜等；另一方面集中在普通PE静电膜的工艺改进上，比如控制褶皱、气泡和穿孔破裂的产生。其中气泡产生，主要是由于原材料没有充分烘干；可是在实际生产中，一些PE薄膜在生产原材料已经烘干的情况下，还是会产生气泡，这是亟待解决的技术难题。
发明内容
为了克服现有技术不足，现提出一种PE薄膜防气泡成形工艺，用于避免气泡产生。
本发明通过如下技术方案实现：一种PE薄膜防气泡成形工艺，采用三层共挤吹膜机生产，其中外层原材料包括茂金属聚乙烯，中层原材料包括低密度聚乙烯，内层原材料包括低密度聚乙烯；三层共挤吹膜机的内层主机一区、二区、三区、四区、换网以及流道的设定温度分别为：145-155℃、155-165℃、155-165℃、155-165℃、150-160℃以及155-165℃，中层主机的设定温度与内层主机的设定温度相同，外层主机一区、二区、三区、四区、换网以及流道的设定温度分别为155-165℃、165-175℃、165-175℃、165-175℃、160-170℃以及160-170℃；模头的口模、一区、二区和模颈的设定温度分别为180-195℃、160-170℃、165-175℃、160-170℃；内层、中层和外层的挤出体积百分比分别为46％、46％和8％。
所述中层原材料还包括色母料，中层原材料中低密度聚乙烯与色母料的重量比为100:1。
所述茂金属聚乙烯采用日本进口的KF360T,所述低密度聚乙烯采用中海壳牌2420H。
在放入三层共挤吹膜机之前对原材料进行烘干，烘干温度50-80℃，烘干时长24小时。
生产的PE薄膜厚度为0.03-0.15mm。
有益效果：本发明直接采用茂金属聚乙烯作为PE薄膜的外层，中层和内层则采用低密度聚乙烯，并优化外层、中层和内层的挤出体积比，优化三层共挤吹膜机各区的温度，使PE薄膜的原材料配方更加简化、生产操作更加稳定，并且生产的PE薄膜厚度可以低至0.03mm，成形的PE薄膜塑化良好，表面平整光滑无皱折、无气泡和穿孔破裂。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
实施例一：
本实施例提供一种PE薄膜防气泡成形工艺，采用三层共挤吹膜机生产，所述三层共挤吹膜机属于现有技术，在此不做赘述。本申请文件中描述的三层共挤吹膜机外层、中层和内层的主机一区、二区、三区、四区、换网和流道，均属于现有概念，在此不做赘述。本申请文件中描述的三层共挤吹膜机模头的口模、一区、二区和模颈均属于三层共挤吹膜机模头的现有概念，其具体部位可以参考专利文献CN204036808U，在此不做赘述。
其中外层原材料包括茂金属聚乙烯，中层原材料包括低密度聚乙烯，内层原材料包括低密度聚乙烯。所述中层原材料可以仅仅是低密度聚乙烯，也可以包括一定重量比的色母料用于调色；如果需要调色，中层原材料中低密度聚乙烯与色母料的重量比为100:1。本实施例提供的是一种透明的PE薄膜防气泡成形工艺，所述外层原材料仅有茂金属聚乙烯、中层原材料仅有低密度聚乙烯、内层原材料仅有低密度聚乙烯。更具体地，所述茂金属聚乙烯采用日本进口的KF360T,所述低密度聚乙烯采用中海壳牌2420H。
本实施例还包括以下步骤：
步骤一、原材料烘干，将外层、内层和中层的所有原材料各自在50-80℃条件下烘干24小时，本实施例优选烘干温度为60℃。
步骤二、升温，先将三层共挤吹膜机的内层、中层和外层的第四区、换网和模头的口模、一区、二区和模颈加热至120℃，并保温2小时；然后将三层共挤吹膜机的内层、中层和外层的各区以及模头各区升至设定温度，并保温1.5小时。
步骤三、开机准备，先用铜片清洁口模，再用清洁布擦拭，然后用铜片清洁过滤网处的胶料，然后更换过滤网；再打开风机。
步骤四、开机，开机顺序为外层主机、中层主机、内层主机，间隔1-2min顺序开机，各层主机先以10-15转/min的速度低速运转，然后根据物料的塑化状态，逐渐将转速调整至30-60转/min。
步骤五、熔融挤出，将原材料放置在主机内，三层主机的转速调整在40-150转/min；待物料挤出后，调节内进风与出风的平衡风量，使环形熔料膨胀呈泡管型；然后开启外冷风机。
步骤六、引膜，将膜泡送入上牵引夹辊，通过后启动牵引辊、夹紧上牵引辊。所述上牵引辊和牵引辊均为三层共挤吹膜机的组成部分，属于现有技术。
步骤七、收卷分切，将膜泡穿过电晕处理机，送入下牵引夹辊，通过启动牵引辊、夹紧下牵引辊，并放刀分切分膜，使A、B两轴分别进行收卷；待膜泡稳定后，再启动电晕处理机，使薄膜电晕处理达到42达英。
上述工艺步骤中，三层共挤吹膜机的内层、中层和外层的各区以及模头各区的设定温度，内层、中层和外层的挤出比等工艺参数如表一所示：
表一、
Figure BDA0002523681370000041
本实施例中，各工艺参数具体值如表二所示：
表二、
Figure BDA0002523681370000051
并且本发明工艺生产的PE薄膜厚度为0.03-0.15mm，本实施例的产品厚度为0.15mm。
实施例二：
本实施例提供一种有色PE薄膜防气泡成形工艺，所述中层原材料包括低密度聚乙烯和色母料，并且中层原材料中低密度聚乙烯与色母料的重量比为100:1。所述内层原材料和外层原材料的组成与实施例一相同，在此不做赘述。
本实施例的工艺还包括以下步骤：
步骤一、原材料烘干，将外层、内层和中层的所有原材料各自在50-80℃条件下烘干24小时，本实施例优选烘干温度为60℃。
步骤二、配料，将中层原材料的低密度聚乙烯与色母料放入高速混合搅拌釜混合10-15min。
本实施例的后续步骤与实施例一中的步骤二至步骤七相同，在此不做赘述。
本实施例中，三层共挤吹膜机的内层、中层和外层的各区以及模头各区的设定温度，内层、中层和外层的挤出比等工艺参数范围与实施例一的表一相同。
本实施例中，各工艺参数的具体值如表三所示：
表三、
Figure BDA0002523681370000061
本实施例的产品厚度为0.03mm。
采用实施例一和实施例二生产的PE薄膜，可用做触摸屏、镜片、塑胶板材的静电保护膜，具有透明度好、洁净度高、表面光滑、容易贴合、容易剥离的特点。并且，原材料配方简化、生产操作简单、稳定，生产的PE薄膜厚度可以低至0.03mm，成形的PE薄膜塑化良好，表面平整光滑无皱折、无气泡和穿孔破裂。
上面所述的实施例仅仅是对本发明的优选实施方式进行描述，并非对本发明的构思和范围进行限定。在不脱离本发明设计构思的前提下，本领域普通人员对本发明的技术方案做出的各种变型和改进，均应落入到本发明的保护范围，本发明请求保护的技术内容，已经全部记载在权利要求书中。

Claims (5)

1.一种PE薄膜防气泡成形工艺，采用三层共挤吹膜机生产，其特征在于：其中外层原材料包括茂金属聚乙烯，中层原材料包括低密度聚乙烯，内层原材料包括低密度聚乙烯；三层共挤吹膜机的内层主机一区、二区、三区、四区、换网以及流道的设定温度分别为：145-155℃、155-165℃、155-165℃、155-165℃、150-160℃以及155-165℃，中层主机的设定温度与内层主机的设定温度相同，外层主机一区、二区、三区、四区、换网以及流道的设定温度分别为155-165℃、165-175℃、165-175℃、165-175℃、160-170℃以及160-170℃；模头的口模、一区、二区和模颈的设定温度分别为180-195℃、160-170℃、165-175℃、160-170℃；内层、中层和外层的挤出体积百分比分别为46％、46％和8％。
2.根据权利要求1所述的一种PE薄膜防气泡成形工艺，其特征在于：所述中层原材料还包括色母料，中层原材料中低密度聚乙烯与色母料的重量比为100:1。
3.根据权利要求1或2所述的一种PE薄膜防气泡成形工艺，其特征在于：所述茂金属聚乙烯采用日本进口的KF360T,所述低密度聚乙烯采用中海壳牌2420H。
4.根据权利要求3所述的一种PE薄膜防气泡成形工艺，其特征在于：在放入三层共挤吹膜机之前对原材料进行烘干，烘干温度50-80℃，烘干时长24小时。
5.根据权利要求4所述的一种PE薄膜防气泡成形工艺，其特征在于：生产的PE薄膜厚度为0.03-0.15mm。
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