CN110815781A - 五层共挤柔性热收缩标签膜的制备方法 - Google Patents

五层共挤柔性热收缩标签膜的制备方法 Download PDF

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CN110815781A
CN110815781A CN201911140019.5A CN201911140019A CN110815781A CN 110815781 A CN110815781 A CN 110815781A CN 201911140019 A CN201911140019 A CN 201911140019A CN 110815781 A CN110815781 A CN 110815781A
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layer
petg
label film
melt flow
temperature
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杨涛
陈丽颖
周军锋
范琪
肖田
钱鑫
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JIANGSU GUANGHUI PACKAGE Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
    • 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
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    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/003—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
    • B29C41/26—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length by depositing flowable material on a rotating drum
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
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    • B29C41/32—Making multilayered or multicoloured articles
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C48/001—Combinations of extrusion moulding with other shaping operations
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    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/005—Shaping by stretching, e.g. drawing through a die; Apparatus therefor characterised by the choice of materials
    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/023—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets using multilayered plates or sheets
    • 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
    • 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
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • 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
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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Abstract

本发明提出的五层共挤柔性热收缩标签膜的制备方法，通过芯层中占比不到1/4的PP，在保留原PETG热收缩标签膜整体性能基础上，提高纯PETG热收缩标签膜的柔顺性，改善标签膜及收缩后标签的手感。

Description

五层共挤柔性热收缩标签膜的制备方法
技术领域
本发明属于塑料薄膜加工技术领域，具体涉及五层共挤柔性热收缩标签膜的制备方法。
背景技术
热收缩标签膜是制作收缩套标的基材薄膜，基本是单一材质薄膜，即使是三层共挤流延拉伸成型的PETG或OPS热收缩标签膜，三层主材质也是一致的。目前材质有PVC、PS、PETG等。该类薄膜均具有较高的收缩性和良好的印刷性，其收缩后，可以在饮品瓶等容器外面形成极佳的贴体效果，加之膜上印刷的精美图案和绚烂色彩，使其成为商品包装的重要组成，并肩负着商品包装的主要宣传装饰功能。360°贴体包装、逼真形象的图案，具有极佳的商品货架宣传效果，因此，热收缩套标成为很多饮品和其他一些塑料容器包装货架商品标签的首选，在标签领域一直保持着较高的增长率，发展前景良好。由于收缩套标多与PET瓶或PET、PE、PP等包装容器配合使用，使用过程中需要先将印刷分切好的标签加工成管状，罩在瓶子或其他容器上，然后受热收缩，让它包紧瓶子或容器。因此，标签(膜)需要具有良好的刚性，以避免罩在容器上时产生软榻现象，影响后面的收缩。另外，收缩套标原则上应该在容器材料软化点温度以下达到所需的高收缩率，否则会因收缩温度过高使容器变形，影响包装效果。此外，收缩套标标签膜还应具有优良的印刷性能，因为图案复杂、多色搭配是套标标签重要特点和优势。因此，PVC、PS、PETG类材料才成为热收缩标签膜的主要基材。但这些材料因有较强的刚性，手感都比较硬挺。特别是收缩变成标签后更加明显。虽因良好的贴体效果，消费者对此弊端并未太在意，但当手紧握套标标签时仍会有生硬的不良感觉。聚丙烯PP，特别是无规共聚聚丙烯，相比PETG、PS和PVC，其薄膜产品柔顺性更好，手感更佳。取向聚丙烯膜主要应用于收缩包装，但聚丙烯收缩膜收缩温度偏高，而且其易带静电，印刷性能欠佳。所以不适合直接用于收缩套标的热收缩标签膜。
发明内容
本发明提出一种五层共挤柔性热收缩标签膜的制备方法，克服上述缺陷，解决热收缩标签膜柔软不足，手感差的问题。
为解决上述技术问题，本发明提供五层共挤柔性热收缩标签膜的制备方法，包括步骤：
(1)将PETG和开口剂放入双螺杆挤出机中熔融塑化，获得PETG熔体流；
(2)将PP粘合树脂放入第一台单螺杆挤出机中熔融塑化，获得PP粘合树脂熔体流；
(3)将PP树脂放入第二台单螺杆挤出机中熔融塑化，获得PP树脂熔体流；
(4)将所述PETG熔体流和所述PP粘合树脂熔体流分别均分成两股熔体流，即第一PETG熔体流、第二PETG熔体流、第一PP粘合树脂熔体流和第二PP粘合树脂熔体流，将第一PETG熔体流、第一PP粘合树脂熔体流、PP树脂熔体流、第二PP粘合树脂熔体流和第二PETG熔体流共五股熔体流通过管道分别进入到共挤流延模头的五个集料管中，所述五股熔体流在所述共挤流延模头的前部叠加融合成一个整体，经所述共挤流延模头的出口缝隙流延至铸冷辊上，冷却成型为五层共挤片材；
(5)将所述五层共挤片材经加热、拉伸、定型、冷却，制成五层共挤柔性热收缩标签膜，所述五层共挤柔性热收缩标签膜从上往下依次为PETG层/PP粘合树脂层/PP层/PP粘合树脂层/PETG层。
作为一种优选方案，步骤(1)中所述PETG和开口剂的质量比为49：1。
作为一种优选方案，步骤(1)中所述双螺杆挤出机熔融塑化的温度为250-270℃。
作为一种优选方案，步骤(2)中所述第一台单螺杆挤出机熔融塑化的温度为170-230℃。
作为一种优选方案，步骤(3)中所述第二台单螺杆挤出机熔融塑化的温度为160-240℃。
作为一种优选方案，步骤(4)中所述冷却成型的温度为22-32℃。
作为一种优选方案，步骤(5)中所述加热的温度为90-140℃、所述拉伸的温度为80-100℃、所述定型的温度为55-85℃、所述冷却的温度为35-50℃。
作为一种优选方案，步骤(5)中所述PETG层的厚度为五层共挤柔性热收缩标签膜的总厚度的1/3。
作为一种优选方案，步骤(5)中所述PETG层：PP粘合树脂层：PP层：PP粘合树脂层：PETG层的厚度比为33-34：4-6：22-24：4-6：33-34。
作为一种优选方案，步骤(5)中所述拉伸为横向拉伸，所述横向拉伸分为预热段3段，拉伸段4段，定型段4段，冷却段2段；所述横向拉伸的拉伸比为1：4～1：6，所述预热段的温度为95-130℃，所述拉伸段的温度为85-95℃，所述定型段的温度为60-80℃，所述冷却段的温度为40-45℃。
与现有技术相比，本发明提出的五层共挤柔性热收缩标签膜的制备方法，通过芯层中占比不到1/4的PP，在保留原PETG热收缩标签膜整体性能基础上，提高纯PETG热收缩标签膜的柔顺性，改善标签膜及收缩后标签的手感。
具体实施方式
为使本发明的上述目的、特征和优点能够更加明显易懂，下面结合具体实施方式对本发明作进一步详细的说明。
此处所称的“一个实施例”或“实施例”是指可包含于本发明至少一个实现方式中的特定特征、结构或特性。在本说明书中不同地方出现的“在一个实施例中”并非均指同一个实施例，也不是单独的或选择性的与其他实施例互相排斥的实施例。
本发明采用五层共挤技术，将PP作为芯层，PETG作为面层，用酸酐改性的聚丙烯聚合物(PP粘合树脂)作为粘合层，通过三台挤出机熔融塑化，其中，PETG挤出熔融塑化温度为250-270℃，PP挤出熔融塑化温度为160-240℃，PP粘合树脂挤出熔融塑化温度为170-230℃，挤出3股熔体流，分别为PETG熔体流、PP粘合树脂熔体流、PP熔体流，然后PETG熔体流和PP粘合树脂熔体流各再均分成两股熔体流，五股熔体流通过管道分别进入到共挤流延模头的五个集料管，然后在模头内按照设计的流道，即芯层，也就是中间层为PP熔体流；芯层两侧为PP粘合树脂熔体流；PP粘合树脂熔体流的外侧，也就是最外层为PETG熔体流，这5层熔体流在模头前部叠加融合成一个整体，经模头出口缝隙流延到铸冷辊上，在温度为22-32℃的条件下冷却成型为五层共挤片材，再经加热至90-140℃，在温度为80-100℃的条件下拉伸、在温度为55-85℃的条件下定型、在温度为35-50℃的条件下冷却，制成五层共挤热收缩薄膜，经牵引、收卷后成为半成品。
PP作为芯层可以赋予共挤薄膜适当的柔韧性，提升收缩标签的手感。PETG作为面层，并设计成单层厚度为薄膜总厚度的1/3，这样不仅可以有效地保证热收缩标签膜的刚性及高收缩率，还能很好的保证收缩标签膜的印刷、合掌等表面性能与PETG收缩膜一致。从而保证该膜与传统PETG热收缩标签膜后加工性和使用特性相当，可以替换使用。因为PETG和PP极性不同，溶解度参数相差较大(PETG为10.7卡/cm3，PP为7.9-8.1卡/cm3)，两者不相容，为了避免PETG/PP/PETG共挤膜出现分层问题，本发明中选用了酸酐改性的聚丙烯聚合物(PP粘合树脂)作为粘合层，设计到PETG和PP中间，以保证上述两种材料能“粘合”成一个整体，使共挤膜可以更好融合两种材料的相关性能，达到设计目的。因此，最终成为一种PETG/PP粘合树脂/PP/PP粘合树脂/PETG五层共挤结构的热收缩标签膜。
五层共挤薄膜结构及各层厚度比例：PETG/PP粘合树脂/PP/PP粘合树脂/PETG＝33-34/4-6/22-24/4-6/33-34。
1、在制备五层共挤柔性热收缩标签膜时，所需的生产设备如下：需要采用3台挤出机，PETG采用双螺杆双排气的非干燥型挤出装备，PP和PP粘合树脂采用单螺杆挤出机，PP挤出成型为可选常规聚烯烃挤出机，PP粘合树脂挤出成型可选低剪切的聚烯烃挤出机。
2、五层共挤柔性热收缩标签膜的工艺流程如下：
①PETG切片+开口爽滑母粒→双螺杆挤出机塑化→计量泵→熔体过滤器；
②PP粘合树脂→单螺杆挤出机塑化；
③PP树脂→单螺杆挤出机塑化；
①、②、③→流延模头集料管→熔体层融合、流延成型→骤冷辊铸片→(纵向拉伸)→横向拉伸→牵引→卷取→半成品。
注：因为热收缩标签膜属于横单向收缩膜，所以平膜法制备热收缩标签膜时，可以不用纵向拉伸工序，由片材直接横向拉伸制取。如采用有纵向拉伸的工艺，纵向拉伸倍数也要选取很小，一般在1:1.20以内，否则薄膜纵向收缩率会偏大。
3、在制备五层共挤柔性热收缩标签膜时的原材料选择如下：
PETG选用：韩国SK公司S2008、K2012；美国Eastman公司的EmbraceTM共聚聚酯、EmbraceTMLV共聚聚酯、GN001、6763；上海石化HSF，以及性能相近的其他共聚聚酯产品中的任意一种。
开口爽滑母粒：瑞士苏卡诺公司TA10-08 MB13，以及性能相近的PETG载体的开口爽滑母粒。
PP选用熔体流动速率在2.0g/10min左右的无开口剂产品。如：德国巴塞尔EP2S34F，独山子PPH-I-022，上海石化1180E，韩国SK R520Y，以及性能相近的其他PP产品中的任意一种。
PP粘合树脂选用：拜牢TM50E561，拜牢TM50E571，拜牢TM50E662，以及性能相近的PP粘合树脂品种中的任意一种。
实施例1-3如下：
1、薄膜结构及原料品种
Figure BDA0002280662070000051
2、各层原料选用及配比
表层，即PETG层，需要添加一定比例的开口爽滑剂。主原料PETG与开口剂用量比例为98:2(质量份)。
芯层，即PP层。100％PP。
粘合层，即PP粘合树脂层，100％PP粘合树脂。
3、主要设备配置
原料系统：料仓2个20m3，2个8m3，2个2m3，矢量计量装置8套。
挤出机：PETG挤出机，平行双螺杆，螺杆直径92mm，长径比40:1，额定挤出量760kg/h；PP挤出机，单螺杆，螺杆直径200mm，带混料头的突变型螺杆，长径比25:1，额定挤出量320kg/h；PP粘合树脂挤出机，单螺杆，螺杆直径65mm，低剪切型，长径比20:1，额定挤出量80kg/h。
PETG熔体计量泵：与PETG挤出机配套，二齿轮容积式，能力300cm3/rpm。
模头：自动调节衣架式五层共挤模头，带有5个集料管，模唇宽度1000mm，口唇开度1.0～2.8，调节螺栓42个。
铸片冷鼓：直径Ф1500mm，辊面宽度1180mm，表面光洁度Ra0.025，辊面控温精度±1℃。
横向拉伸：拉伸区设置，预热段3段，拉伸段4段，定型段4段，冷却段2段；拉伸比1：4～1：6。
牵引：牵引辊，7根，直径350mm。
收卷：双工位接触和间隙收卷机，收卷宽度4200mm，收卷直径1000mm。
4、主要工艺参数
挤出机塑化温度：PETG挤出机250-268℃，PP挤出机170-230℃，PP粘合树脂挤出机190-220℃。
模头温度：245-262℃；
铸片冷鼓进水温度：26℃；
静电吸附装置高压设置：8.1KV；
横向拉伸区温度设定：预热区温度95-130℃；拉伸区温度85-95℃
定型区温度60-80℃；冷却区温度40-45℃；横向拉伸比例：1:4.8
5、薄膜主要性能
Figure BDA0002280662070000071
注：对比样品为三层共挤PETG透明膜，内外层均为PETG。
应说明的是，以上实施例仅用以说明本发明的技术方案而非限制，尽管参照较佳实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或者等同替换，而不脱离本发明技术方案的精神和范围，其均应涵盖在本发明的权利要求范围当中。

Claims (10)

1.一种五层共挤柔性热收缩标签膜的制备方法，其特征是，包括步骤：
(1)将PETG和开口剂放入双螺杆挤出机中熔融塑化，获得PETG熔体流；
(2)将PP粘合树脂放入第一台单螺杆挤出机中熔融塑化，获得PP粘合树脂熔体流；
(3)将PP树脂放入第二台单螺杆挤出机中熔融塑化，获得PP树脂熔体流；
(4)将所述PETG熔体流和所述PP粘合树脂熔体流分别均分成两股熔体流，即第一PETG熔体流、第二PETG熔体流、第一PP粘合树脂熔体流和第二PP粘合树脂熔体流，将第一PETG熔体流、第一PP粘合树脂熔体流、PP树脂熔体流、第二PP粘合树脂熔体流和第二PETG熔体流共五股熔体流通过管道分别进入到共挤流延模头的五个集料管中，所述五股熔体流在所述共挤流延模头的前部叠加融合成一个整体，经所述共挤流延模头的出口缝隙流延至铸冷辊上，冷却成型为五层共挤片材；
(5)将所述五层共挤片材经加热、拉伸、定型、冷却，制成五层共挤柔性热收缩标签膜，所述五层共挤柔性热收缩标签膜从上往下依次为PETG层/PP粘合树脂层/PP层/PP粘合树脂层/PETG层。
2.如权利要求1所述的五层共挤柔性热收缩标签膜的制备方法，其特征是：步骤(1)中所述PETG和开口剂的质量比为49：1。
3.如权利要求1所述的五层共挤柔性热收缩标签膜的制备方法，其特征是：步骤(1)中所述双螺杆挤出机熔融塑化的温度为250-270℃。
4.如权利要求1所述的五层共挤柔性热收缩标签膜的制备方法，其特征是：步骤(2)中所述第一台单螺杆挤出机熔融塑化的温度为170-230℃。
5.如权利要求1所述的五层共挤柔性热收缩标签膜的制备方法，其特征是：步骤(3)中所述第二台单螺杆挤出机熔融塑化的温度为160-240℃。
6.如权利要求1所述的五层共挤柔性热收缩标签膜的制备方法，其特征是：步骤(4)中所述冷却成型的温度为22-32℃。
7.如权利要求1所述的五层共挤柔性热收缩标签膜的制备方法，其特征是：步骤(5)中所述加热的温度为90-140℃、所述拉伸的温度为80-100℃、所述定型的温度为55-85℃、所述冷却的温度为35-50℃。
8.如权利要求1所述的五层共挤柔性热收缩标签膜的制备方法，其特征是：步骤(5)中所述PETG层的厚度为五层共挤柔性热收缩标签膜的总厚度的1/3。
9.如权利要求1所述的五层共挤柔性热收缩标签膜的制备方法，其特征是：步骤(5)中所述PETG层：PP粘合树脂层：PP层：PP粘合树脂层：PETG层的厚度比为33-34：4-6：22-24：4-6：33-34。
10.如权利要求1所述的五层共挤柔性热收缩标签膜的制备方法，其特征是：步骤(5)中所述拉伸为横向拉伸，所述横向拉伸分为预热段3段，拉伸段4段，定型段4段，冷却段2段；所述横向拉伸的拉伸比为1：4~1：6，所述预热段的温度为95-130℃，所述拉伸段的温度为85-95℃，所述定型段的温度为60-80℃，所述冷却段的温度为40-45℃。
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EP1658973A1 (en) * 2004-11-17 2006-05-24 Curwood, Inc. Breathable packaging film having enhanced thermoformability
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EP1658973A1 (en) * 2004-11-17 2006-05-24 Curwood, Inc. Breathable packaging film having enhanced thermoformability
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