CN107187155A - 一种高光镀铝片材及其制备方法 - Google Patents

一种高光镀铝片材及其制备方法 Download PDF

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CN107187155A
CN107187155A CN201710325570.1A CN201710325570A CN107187155A CN 107187155 A CN107187155 A CN 107187155A CN 201710325570 A CN201710325570 A CN 201710325570A CN 107187155 A CN107187155 A CN 107187155A
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layers
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徐黎平
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Hangzhou Tomorrow Soft Packing Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B29C66/712General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined the composition of one of the parts to be joined being different from the composition of the other part
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
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    • B29C66/72General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/36Layered products comprising a layer of synthetic resin comprising polyesters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00Flat articles, e.g. films or sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00Layered products
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00Layers arrangement
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00Coating on the layer surface
    • B32B2255/10Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00Coating on the layer surface
    • B32B2255/20Inorganic coating
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    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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Abstract

本发明是一种高光镀铝片材,特别涉及一种高光镀铝片材及其制备方法。包括VMPET层、PE外膜和PE内膜,所述的VMPET层的表面设有PE外膜,所述的VMPET层的背面设有PE内膜,所述的PE外膜包括CPE内层、CPE表层和LDPE表层,所述的VMPET层的表面设有LDPE表层,所述的VMPET层的表面与LDPE表层间设有CPE内层,所述的LDPE表层的表面设有CPE表层。一种高光镀铝片材及其制备方法,结构紧凑,使用效果明显,节约能源。

Description

一种高光镀铝片材及其制备方法
技术领域
本发明是一种高光镀铝片材,特别涉及一种高光镀铝片材及其制备方法。
背景技术
铝塑复合片材从20世纪90年代引入国内以来,经历了十几年的快速发展,无论在成本上还是质量稳定性上都实现了长足的进步。随着技术的进步和消费者消费习惯的改变,复合片材也越来越朝多功能化、环保化、节约化发展。而全塑复合软管片材已经开始得到应用,尚未得到大面积推广的原因是成本还高于普通铝塑片材的20%~30%。随着技术的进步,全塑片材与更薄型片材仍是未来的主要发展趋势。
镀铝膜既有塑料薄膜的特性,又具有金属的特性。既延长了内容物的保质期,又提高了薄膜的亮度,从一定程度上代替了铝箔,也具有价廉、美观及较好的阻隔性能,因此,镀铝片材的广泛应用也是复合片材未来发展的趋势。
中国专利201110308680.X,公开一种彩色半透明BOPET镀铝膜,其特征在于,其包括镀铝层、彩色涂料底涂涂层、BOPET原膜层,BOPET原膜层的厚度为十二微米,彩色涂料底涂涂层设在镀铝层和BOPET原膜层的中间;所述彩色半透明BOPET镀铝膜由下述制造方法制得:第一步:BOPET原膜选择:选择厚度为十二微米的BOPET原膜;第二步:金色涂层涂布处理:用涂料添加入0.05%比例的红色色粉和0.4%比例的黄色色粉,将其充分混合均匀后在涂布机上,利用200目的网纹辊对原膜电晕面进行固含量为0.7~1.0克/平方米的涂布,涂布完成后涂层的厚度1±0.2微米;所述红色色粉和黄色色粉为中山市彩艺金属颜料有限公司的系列色粉,所述涂布机为温州博大机械有限公司的型号为THG2100的涂布机;第三步:将做好金色涂层的BOPET原膜置入真空镀铝设备,即可将蒸发舟打开预热至设备设定值70%~85%之间,然后开启铝丝传送,传送速度控制在180~450mm/min之间,开动设备卷绕至速度≥3.5m/s后,打开设备挡板开始蒸镀,铝蒸汽冷凝到冷却主毂表面不停卷绕的BOPET原膜的涂布面上;根据在线测定镀铝薄膜微涂层厚度变化测量的装置所测量的镀铝层厚度调整卷绕速度,卷绕速度控制在10.5~14.0m/s之间,镀铝层的厚度控制在75埃米~85埃米之间,直至BOPET原膜整卷生产完毕,停机、冷却蒸发舟、排真空、开仓卸膜、检测镀铝层厚度,产品蒸镀结束。
发明内容
本发明主要是解决现有技术中存在的不足,结构紧凑,使用性能出色,进一步保护环境的一种高光镀铝片材及其制备方法。
本发明的上述技术问题主要是通过下述技术方案得以解决的:
一种高光镀铝片材,包括VMPET层、PE外膜和PE内膜,所述的VMPET层的表面设有PE外膜,所述的VMPET层的背面设有PE内膜,所述的PE外膜包括CPE内层、CPE表层和LDPE表层,所述的VMPET层的表面设有LDPE表层,所述的VMPET层的表面与LDPE表层间设有CPE内层,所述的LDPE表层的表面设有CPE表层;
所述的PE内膜包括LDPE内层、CPE中层和CPE底层,所述的VMPET层的背面设有LDPE内层,所述的LDPE内层与VMPET层间设有CPE中层,所述的LDPE内层的背面设有CPE底层;
所述的VMPET层的材质为聚酯镀铝膜,所述的LDPE表层和LDPE内层的材质分别为高压聚乙烯,所述的CPE表层、CPE中层和CPE底层的材质分别为氯化聚乙烯;
所述的CPE表层、LDPE表层、CPE内层、VMPET层、CPE中层、LDPE内层和CPE底层自上而下粘合而成。
一种高光镀铝片材的制备方法,按以下步骤进行:
(一)、选材要求:
PE外膜用于印刷和外观展示,还需良好的透明性,其透光性对VMPET的反光效果影响很大,CPE要选取高透性的,透光率达到90%以上;
无杂点,且晶点颗粒直径小于0.5mm,分散均匀,每平方数量少于5个;
VMPET是通过真空镀铝工艺将一层薄薄的铝原子堆积到优质PET薄膜上而形成的阻隔性薄膜,而在镀铝片材对镀铝层的附着力要求更高,VMPET的PET需要经过一定的化学处理来增强镀铝层的附着力,镀铝PET选用一级VMPET,镀铝被剥离面积比例小于10%;
PE内膜用于制管热封,并与内容物直接接触,需要具有良好的热封性能和化学腐蚀性;PE外膜需要很高的透明性而牺牲了挺度,PE内膜需要较好的挺度;
(二)、生产步骤:
1、复合工序
复合工序,采用干式复合,分两次复合,干复机参数设定如下:
干燥 第一烘箱 第二烘箱 第三烘箱 预热温度 复合温度
温度℃ 60 70 80 55 80
网线辊使用90线网线辊上胶;
第一次干复:VMPET层与CPE内层复合,将选取好的VMPET层装在一号放卷机(VMPET层的镀铝面上胶),CPE内层装在二号放卷机,机速控制在55m/min,使用蒸煮胶水,胶水浓度为25%,VMPET层的镀铝面与CPE内层的电晕面进行干式复合;
第二次干复:CPE内层/VMPET层半成品与CPE-2复合,将半成品CPE内层/VMPET半成品装在一号放卷机,CPE中层装在二号放卷机,机速控制在60m/min,使用蒸煮胶水,胶水浓度为30%,VMPET层非镀铝面与CPE中层电晕面进行干式复合;
复合过程中,胶水粘度每个1小时测一次,确保每次干复的胶水粘度保持在16-18s,胶水量度杯在每次测试后一定要用乙酯清洗,干复完成之后,每卷注明淋膜复合面,CPE中层非电晕面为淋膜面;
2、熟化:
复合完成后,将半成品送收入熟化炉中,在温度50℃条件下,熟化96小时,熟化后的半成品必须达到以下条件:
①、干复胶水要充分干燥充分,不能有分层、胶水不干发粘现象;
②、CPE内层与VMPET层之间的强度≥4N/15mm,
VMPET层与CPE中层之间的强度≥5N/15mm;
③、半成品外观,特别是外层,无麻点杂点,无条纹折皱相关不良现象;
3、挤复工序:
挤复工序,采用单淋模式的挤复机,要求机器有电晕处理仪器,分两次挤复,根据粒料物理参数设定好挤复机参数;
第一次淋膜:干复半成品卷膜CPE内层/VMPET层/CPE中层装在一号放卷机上,CPE中层的非电晕面在线进行电晕处理,使其表面张力达到38-42达因,原材料CPE底层装在二号放卷机上,CPE中层非电晕面与CPE底层电晕面干复卷膜的之间进行淋膜LDPE表层,第一次淋膜的剥离强度≥6N/15mm
第二次淋膜:第一次淋膜后的半成品装在一号放卷机上,原材料CPE表层装在二号放卷机上,干复卷膜的CPE内层非电晕面与CPE表层非电晕面之间淋膜LDPE内层;
(三)、验收标准:
淋膜完成后,放置12小时,半成品片材卷膜必须满足以下条件:
①、表层淋膜LDPE表层的剥离强度CPE内层//CPE表层≥5N/15mm,
内层淋膜LDPE内层的剥离强度CPE中层//CPE底层≥6N/15mm,
CPE内层与VMPET层之间的强度≥3N/15mm,
VMPET层与CPE中层之间的强度≥3N/15mm;
②、片材卷膜外观无明显的凹凸点、麻点杂点相关不良现象;
③、不允许出现影响使用的气泡、刮痕、折皱、条纹和杂质污染相关现象。
④、片材卷膜平整,厚薄均匀,无褶皱、无荡边相关不良现象。
高光镀铝片材主要适用于药品软管片材、牙膏软管片材、化妆品软管片材等相关领域,特别在露铝片材中,被广泛应用。
因此,本发明提供的一种高光镀铝片材及其制备方法,结构紧凑,使用效果明显,节约能源。
附图说明
图1是本发明的材层结构示意图。
具体实施方式
下面通过实施例,并结合附图,对本发明的技术方案作进一步具体的说明。
实施例1:如图1所示,一种高光镀铝片材,包括VMPET层1、PE外膜和PE内膜,所述的VMPET层1的表面设有PE外膜,所述的VMPET层1的背面设有PE内膜,所述的PE外膜包括CPE内层2、CPE表层3和LDPE表层4,所述的VMPET层1的表面设有LDPE表层4,所述的VMPET层1的表面与LDPE表层4间设有CPE内层2,所述的LDPE表层4的表面设有CPE表层3;
所述的PE内膜包括LDPE内层5、CPE中层6和CPE底层7,所述的VMPET层1的背面设有LDPE内层5,所述的LDPE内层5与VMPET层1间设有CPE中层6,所述的LDPE内层5的背面设有CPE底层7;
所述的VMPET层1的材质为聚酯镀铝膜,所述的LDPE表层4和LDPE内层5的材质分别为高压聚乙烯,所述的CPE表层3、CPE中层6和CPE底层7的材质分别为氯化聚乙烯;
所述的CPE表层3、LDPE表层4、CPE内层2、VMPET层1、CPE中层6、LDPE内层5和CPE底层7自上而下粘合而成。
一种利用高光镀铝片材的制备方法,按以下步骤进行:
(一)、选材要求:
PE外膜用于印刷和外观展示,还需良好的透明性,其透光性对VMPET的反光效果影响很大,CPE要选取高透性的,透光率达到90%以上;
无杂点,且晶点颗粒直径小于0.5mm,分散均匀,每平方数量少于5个;
VMPET是通过真空镀铝工艺将一层薄薄的铝原子堆积到优质PET薄膜上而形成的阻隔性薄膜,而在镀铝片材对镀铝层的附着力要求更高,VMPET的PET需要经过一定的化学处理来增强镀铝层的附着力,镀铝PET选用一级VMPET,镀铝被剥离面积比例小于10%;
PE内膜用于制管热封,并与内容物直接接触,需要具有良好的热封性能和化学腐蚀性;PE外膜需要很高的透明性而牺牲了挺度,PE内膜需要较好的挺度;
(二)、生产步骤:
1、复合工序
复合工序,采用干式复合,分两次复合,干复机参数设定如下:
干燥 第一烘箱 第二烘箱 第三烘箱 预热温度 复合温度
温度℃ 60 70 80 55 80
网线辊使用90线网线辊上胶;
第一次干复:VMPET层与CPE内层复合,将选取好的VMPET层装在一号放卷机(VMPET层的镀铝面上胶),CPE内层装在二号放卷机,机速控制在55m/min,使用蒸煮胶水,胶水浓度为25%,VMPET层的镀铝面与CPE内层的电晕面进行干式复合;
第二次干复:CPE内层/VMPET层半成品与CPE-2复合,将半成品CPE内层/VMPET半成品装在一号放卷机,CPE中层装在二号放卷机,机速控制在60m/min,使用蒸煮胶水,胶水浓度为30%,VMPET层非镀铝面与CPE中层电晕面进行干式复合;
复合过程中,胶水粘度每个1小时测一次,确保每次干复的胶水粘度保持在16-18s,胶水量度杯在每次测试后一定要用乙酯清洗,干复完成之后,每卷注明淋膜复合面,CPE中层非电晕面为淋膜面;
2、熟化:
复合完成后,将半成品送收入熟化炉中,在温度50℃条件下,熟化96小时,熟化后的半成品必须达到以下条件:
④、干复胶水要充分干燥充分,不能有分层、胶水不干发粘现象;
⑤、CPE内层与VMPET层之间的强度≥4N/15mm,
VMPET层与CPE中层之间的强度≥5N/15mm;
⑥、半成品外观,特别是外层,无麻点杂点,无条纹折皱相关不良现象;
3、挤复工序:
挤复工序,采用单淋模式的挤复机,要求机器有电晕处理仪器,分两次挤复,根据粒料物理参数设定好挤复机参数;
第一次淋膜:干复半成品卷膜CPE内层/VMPET层/CPE中层装在一号放卷机上,CPE中层的非电晕面在线进行电晕处理,使其表面张力达到38-42达因,原材料CPE底层装在二号放卷机上,CPE中层非电晕面与CPE底层电晕面干复卷膜的之间进行淋膜LDPE表层,第一次淋膜的剥离强度≥6N/15mm
第二次淋膜:第一次淋膜后的半成品装在一号放卷机上,原材料CPE表层装在二号放卷机上,干复卷膜的CPE内层非电晕面与CPE表层非电晕面之间淋膜LDPE内层;
(三)、验收标准:
淋膜完成后,放置12小时,半成品片材卷膜必须满足以下条件:
①、表层淋膜LDPE表层的剥离强度CPE内层//CPE表层≥5N/15mm,
内层淋膜LDPE内层的剥离强度CPE中层//CPE底层≥6N/15mm,
CPE内层与VMPET层之间的强度≥3N/15mm,
VMPET层与CPE中层之间的强度≥3N/15mm;
④、片材卷膜外观无明显的凹凸点、麻点杂点相关不良现象;
⑤、不允许出现影响使用的气泡、刮痕、折皱、条纹和杂质污染相关现象。
④、片材卷膜平整,厚薄均匀,无褶皱、无荡边相关不良现象。

Claims (2)

1.一种高光镀铝片材,其特征在于:包括VMPET层(1)、PE外膜和PE内膜,所述的VMPET层(1)的表面设有PE外膜,所述的VMPET层(1)的背面设有PE内膜,所述的PE外膜包括CPE内层(2)、CPE表层(3)和LDPE表层(4),所述的VMPET层(1)的表面设有LDPE表层(4),所述的VMPET层(1)的表面与LDPE表层(4)间设有CPE内层(2),所述的LDPE表层(4)的表面设有CPE表层(3);
所述的PE内膜包括LDPE内层(5)、CPE中层(6)和CPE底层(7),所述的VMPET层(1)的背面设有LDPE内层(5),所述的LDPE内层(5)与VMPET层(1)间设有CPE中层(6),所述的LDPE内层(5)的背面设有CPE底层(7);
所述的VMPET层(1)的材质为聚酯镀铝膜,所述的LDPE表层(4)和LDPE内层(5)的材质分别为高压聚乙烯,所述的CPE表层(3)、CPE中层(6)和CPE底层(7)的材质分别为氯化聚乙烯;
所述的CPE表层(3)、LDPE表层(4)、CPE内层(2)、VMPET层(1)、CPE中层(6)、LDPE内层(5)和CPE底层(7)自上而下粘合而成。
2.一种利用权利要求1所述的高光镀铝片材的制备方法,其特征在于按以下步骤进行:
(一)、选材要求:
PE外膜用于印刷和外观展示,还需良好的透明性,其透光性对VMPET的反光效果影响很大,CPE要选取高透性的,透光率达到90%以上;
无杂点,且晶点颗粒直径小于0.5mm,分散均匀,每平方数量少于5个;
VMPET是通过真空镀铝工艺将一层薄薄的铝原子堆积到优质PET薄膜上而形成的阻隔性薄膜,而在镀铝片材对镀铝层的附着力要求更高,VMPET的PET需要经过一定的化学处理来增强镀铝层的附着力,镀铝PET选用一级VMPET,镀铝被剥离面积比例小于10%;
PE内膜用于制管热封,并与内容物直接接触,需要具有良好的热封性能和化学腐蚀性;PE外膜需要很高的透明性而牺牲了挺度,PE内膜需要较好的挺度;
(二)、生产步骤:
1、复合工序
复合工序,采用干式复合,分两次复合,干复机参数设定如下:
干燥 第一烘箱 第二烘箱 第三烘箱 预热温度 复合温度 温度℃ 60 70 80 55 80
网线辊使用90线网线辊上胶;
第一次干复:VMPET层与CPE内层复合,将选取好的VMPET层装在一号放卷机(VMPET层的镀铝面上胶),CPE内层装在二号放卷机,机速控制在55m/min,使用蒸煮胶水,胶水浓度为25%,VMPET层的镀铝面与CPE内层的电晕面进行干式复合;
第二次干复:CPE内层/VMPET层半成品与CPE-2复合,将半成品CPE内层/VMPET半成品装在一号放卷机,CPE中层装在二号放卷机,机速控制在60m/min,使用蒸煮胶水,胶水浓度为30%,VMPET层非镀铝面与CPE中层电晕面进行干式复合;
复合过程中,胶水粘度每个1小时测一次,确保每次干复的胶水粘度保持在16-18s,胶水量度杯在每次测试后一定要用乙酯清洗,干复完成之后,每卷注明淋膜复合面,CPE中层非电晕面为淋膜面;
2、熟化:
复合完成后,将半成品送收入熟化炉中,在温度50℃条件下,熟化96小时,熟化后的半成品必须达到以下条件:
①、干复胶水要充分干燥充分,不能有分层、胶水不干发粘现象;
②、CPE内层与VMPET层之间的强度≥4N/15mm,
VMPET层与CPE中层之间的强度≥5N/15mm;
③、半成品外观,特别是外层,无麻点杂点,无条纹折皱相关不良现象;
3、挤复工序:
挤复工序,采用单淋模式的挤复机,要求机器有电晕处理仪器,分两次挤复,根据粒料物理参数设定好挤复机参数;
第一次淋膜:干复半成品卷膜CPE内层/VMPET层/CPE中层装在一号放卷机上,CPE中层的非电晕面在线进行电晕处理,使其表面张力达到38-42达因,原材料CPE底层装在二号放卷机上,CPE中层非电晕面与CPE底层电晕面干复卷膜的之间进行淋膜LDPE表层,第一次淋膜的剥离强度≥6N/15mm
第二次淋膜:第一次淋膜后的半成品装在一号放卷机上,原材料CPE表层装在二号放卷机上,干复卷膜的CPE内层非电晕面与CPE表层非电晕面之间淋膜LDPE内层;
(三)、验收标准:
淋膜完成后,放置12小时,半成品片材卷膜必须满足以下条件:
①、表层淋膜LDPE表层的剥离强度CPE内层//CPE表层≥5N/15mm,
内层淋膜LDPE内层的剥离强度CPE中层//CPE底层≥6N/15mm,
CPE内层与VMPET层之间的强度≥3N/15mm,
VMPET层与CPE中层之间的强度≥3N/15mm;
②、片材卷膜外观无明显的凹凸点、麻点杂点相关不良现象;
③、不允许出现影响使用的气泡、刮痕、折皱、条纹和杂质污染相关现象。
④、片材卷膜平整,厚薄均匀,无褶皱、无荡边相关不良现象。
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