CN108274872A - 环保型可降解袋 - Google Patents
环保型可降解袋 Download PDFInfo
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- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
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- 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
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- B32B7/10—Interconnection of layers at least one layer having inter-reactive properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Engineering & Computer Science (AREA)
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Abstract
本发明公开了一种环保型可降解袋,旨在提供一种具有既能降解,达到环保的目的,又具有出色的阻隔性能,极佳的遮光性能,以及热封性能等包装性能的优点的环保型可降解袋,其技术方案要点是,包括设于中间位置的镀铝基层,镀铝基层上表面两侧均覆盖有降解处理层,镀铝基层一侧的降解处理层上设有可降解膜表层,另一侧的降解处理层上设有降解中间层,降解中间层外覆盖有用于与可降解膜表层配合将整体热压封合的降解热封层,一侧的降解膜表层和降解处理层形成外层,另一侧的降解膜表层与降解中间层及降解热封层构成内层,镀铝基层镀在内层上,其既容易降解,达到环保的目的,又具有出色的阻隔性能,极佳的遮光性能,以及热封性能等包装性能。
Description
技术领域
本发明涉及塑料袋领域,具体涉及一种环保型可降解袋。
背景技术
塑料袋是人们日常生活中必不可少的物品,常被用来装其他物品。在软包装市场,塑料袋的包装占有举足轻重的地位,在生活的各个领域随处可见塑料袋的包装,食品领域更不例外,但塑料袋结构一般都比较复杂,常规三层,少则两层,多则四到五层,这些材料的组成成分都或多或少的起着阻氧阻湿阻香味的作用,有的成分还需要热封性能,遮光性能等。
目前市场上一般采用硝化纤维制的塑料袋,因其廉价、重量极轻、容量大、便于收纳的优点被广泛使用,但又因为塑料袋降解周期极长、处理困难的缺点而被部分国家禁止使用和生产,利用可生物降解的淀粉材料和天然纤维来制备可降解塑料袋已成为世界各国研究的热点。
但淀粉材料和天然纤维在提高塑料可降解性能的同时也存在着许多问题,一方面会造成其物理机械性能的下降,力学性能偏低,承重压力不够,不能反复使用和携带,还存在亲水性太强,与大部分通用树脂之间的相容性很差,致使制成的薄膜力学性能大幅下降,阻水性能差的问题,另一方面,天然纤维相对于硝化纤维而言的耐环境性差,如抗微生物性差,从而阻碍了淀粉和天然纤维制得的塑料在工业化推广过程中的广泛应用。
目前,公开号为CN106428937A的中国专利公开了一种可降解塑料袋,该可降解塑料袋按质量百分比为:短链纤维素30%、植物性凝胶0.5%、植物性固化剂0.5%、植物性定型剂4%、增稠剂0.5%、自崩剂2%、乳化剂3%、其余为水。
公开号为CN106398069A的中国专利公开了一种新型可降解塑料袋材料,塑料袋材料包由以下重量份数组成:包括改性PVA60-80份、醋酸酯淀粉30-40份、醋酸纤维素20-30份、乙烯-醋酸乙烯共聚物20-30份、变性淀粉40-50份、冰乙酸20-30份、乙酸酐20-30份、交联剂3-8份、稳定剂3-8份。
这种新型可降解塑料袋材料虽然,解决了无法降解、污染水体、环境的问题,但是其韧性、热封性能、遮光性能、阻氧阻湿性能相对于硝化纤维塑料袋均有较大程度降低,从而影响用户的使用。
发明内容
本发明的目的是提供一种环保型可降解袋,其具有既能降解,达到环保的目的,又具有出色的阻隔性能,极佳的遮光性能,以及热封性能等包装性能的优点。
本发明的上述技术目的是通过以下技术方案得以实现的:
一种环保型可降解袋,包括设于中间位置的镀铝基层,镀铝基层上表面两侧均覆盖有降解处理层,镀铝基层一侧的降解处理层上设有可降解膜表层,另一侧的降解处理层上设有降解中间层,降解中间层外覆盖有用于与可降解膜表层配合将整体热压封合的降解热封层,一侧的降解膜表层和降解处理层形成外层,另一侧的降解膜表层与降解中间层及降解热封层构成内层,镀铝基层镀在内层上。
通过采用上述技术方案,降解处理层与可降解膜表层形成的外层在光线中UV和热的作用下,会逐渐裂解,并最终被自然界中的微生物所吸收,且印刷适性和加工性能均较为良好;降解膜表层、降解中间层及降解热封层构成的内层上镀铝设置,形成镀铝基层,该涂层能有效的提高铝层的阻隔性,透氧可以达到0.5cm3/m2/24h以下,透湿可以达到0.5g/m2/24h以下。
并且在这种条件下,镀铝基层光密度为1.7。如此当该产品在自然界中降解时,外层可以直接受到阳光中的UV光线照射而分解,内层则是通过铝层透过的UV光线而开始分解,比光密度值为1.9的镀铝层分解效率提升50%。
这种涂层与镀铝结合的方式有效的获得了高阻隔性能和材料后解的分解性,由此本申请既容易降解,达到环保的目的,又具有出色的阻隔性能,极佳的遮光性能,以及热封性能等包装性能。
进一步设置:降解处理层与镀铝基层之间设有粘合层,用于将内层与外层固定。
通过采用上述技术方案,如此能够将内层与外层固定,得到较为良好的产品包装性能,提高包装袋的阻隔性,且能够使其具有极佳的易撕性能,便于用户的使用。
进一步设置:可降解膜表层与降解处理层均通过氧化式生物降解双向拉伸聚丙烯材料作为印刷基膜印刷制成。
进一步设置:降解处理层、降解中间层和降解热封层三层共挤得到双向拉伸可降解聚丙烯膜。
通过采用上述技术方案,保证了内层与外层的可降解性,同时降解后的镀铝基层不易对环境产生影响,进一步提高了可降解袋的环保性能。
本发明的另一目的是提供一种环保型可降解袋的生产工艺,其具有既能降解,达到环保的目的,又具有出色的阻隔性能,极佳的遮光性能,以及热封性能等包装性能的优点。
本发明的上述技术目的是通过以下技术方案得以实现的:
一种上述环保型可降解袋的生产工艺,包括如下步骤
(1)、取氧化式生物降解双向拉伸聚丙烯材料作为印刷基膜进行印刷,通过双层共挤制得相互贴合的降解膜表层和降解处理层,形成外层;
(2)、取氧化式生物降解双向拉伸聚丙烯材料,经三层共挤得到降解处理层、降解中间层和降解热封层,构成内层;
(3)、通过真空镀铝的方式在内层的降解处理层表面镀上镀铝基层,并采用水性涂层涂覆以增加镀铝牢度;
(4)、通过粘合层将内层与外层粘合固定,形成可降解膜;
(5)、取上述可降解膜,对应三层降解热封层首尾热压,三边封制袋,得到成品
镀铝基层的涂布干重量为0.8~1g/m2。
综上所述,本发明具有以下有益效果:
有效的获得了高阻隔性能和材料后解的分解性,由此本申请既容易降解,达到环保的目的,又具有出色的阻隔性能,极佳的遮光性能,以及热封性能等包装性能,且能够使其具有极佳的易撕性能,便于用户的使用。
附图说明
下面结合附图对本发明进一步说明。
图1是实施例1的层面示意图;
图2是实施例1的封制结构示意图。
图中,1、可降解膜表层;2、降解处理层;3、粘合层;4、镀铝基层;5、降解中间层;6、降解热封层;7、内层;8、外层。
具体实施方式
下面结合附图对本发明的具体实施方式做进一步说明。
本发明所采用的技术方案是:
实施例1,一种环保型可降解袋,如图1所示,包括相对设置的可降解膜表层1和降解热封层6,可降解膜表层1朝向外界设置,可降解热封层6用于热封制袋。可降解膜表层1底部设有可降解处理层2,可降解膜表层1与可降解处理层2双层共挤形成外层8,且可降解膜表层1与降解处理层2均通过氧化式生物降解双向拉伸聚丙烯材料作为印刷基膜印刷制成。
如图1所示,降解热封层6上方设有降解中间层5,降解中间层5顶部贴合有可降解处理层2,可降解处理层2、降解中间层5与降解热封层6均通过氧化式生物降解双向拉伸聚丙烯材料制得,并且通过三层共挤的方式制得外层8。
如图1所示,外层8上表面镀有镀铝基层4,镀铝基层4通过水性镀铝涂层镀在外层8上。外层8与内层7之间通过站热层热粘合,使外层8与内层7相互固定,从而得到成品。
实施例2,一种环保型可降解袋的生产工艺,包括如下步骤,
(1)、取氧化式生物降解双向拉伸聚丙烯材料作为印刷基膜进行印刷,通过双层共挤制得相互贴合的降解膜表层和降解处理层2,形成外层8,表面热处理;
(2)、取氧化式生物降解双向拉伸聚丙烯材料,经三层共挤得到降解处理层2、降解中间层5和降解热封层6,构成内层7;
(3)、通过真空镀铝的方式在内层7的降解处理层2表面镀上镀铝基层4,并采用水性镀铝涂层涂覆以增加镀铝牢度,其中镀铝基层4的涂布干重量为0.8~1g/m2;
(4)、通过粘合层3将内层7与外层8粘合固定,形成可降解膜;
(5)、取上述可降解膜,对应三层降解热封层6首尾热压,三边封制袋,得到成品。
可降解膜表层1、降解处理层2为含氧生物降解双向拉伸聚丙烯作为印刷基膜并进行印刷,降解处理层2、降解中间层5和降解热封层6三层共挤出双向拉伸可降解聚丙烯膜,通过镀铝基层4增加材料的阻隔性,对阻氧阻湿等均有极佳的阻隔作用。
粘合层3为水性粘合剂层,将可降解膜表层1、降解处理层2两层共挤膜与降解处理层2、降解中间层5和降解热封层6三层共挤膜粘合到一起,得到一种全新的可降解高阻隔膜,并从而可制袋高阻隔可降解袋。如图2所示,最后通过不同膜之间的降解热封层6相互热压封合,三边封制袋得到成品可降解袋。
以上是本发明的较佳实施例而已,并非对本发明作任何形式上的限制,凡是依据本发明的技术实质对以上实施例所做的任何简单修改、等同变化与修饰,均属于发明技术方案的范围内。
Claims (6)
1.一种环保型可降解袋,其特征在于:包括设于中间位置的镀铝基层(4),镀铝基层(4)上表面两侧均覆盖有降解处理层(2),镀铝基层(4)一侧的降解处理层(2)上设有可降解膜表层(1),另一侧的降解处理层(2)上设有降解中间层(5),降解中间层(5)外覆盖有用于与可降解膜表层(1)配合将整体热压封合的降解热封层(6),一侧的降解膜表层和降解处理层(2)形成外层(8),另一侧的降解膜表层与降解中间层(5)及降解热封层(6)构成内层(7),镀铝基层(4)镀在内层(7)上。
2.根据权利要求1所述的环保型可降解袋,其特征在于:所述降解处理层(2)与镀铝基层(4)之间设有粘合层(3),用于将内层(7)与外层(8)固定。
3.根据权利要求1所述的环保型可降解袋,其特征在于:所述可降解膜表层(1)与降解处理层(2)均通过氧化式生物降解双向拉伸聚丙烯材料作为印刷基膜印刷制成。
4.根据权利要求1所述的环保型可降解袋,其特征在于:所述降解处理层(2)、降解中间层(5)和降解热封层(6)三层共挤得到双向拉伸可降解聚丙烯膜。
5.一种如权利要求1所述的环保型可降解袋的生产工艺,其特征在于:包括如下步骤
(1)、取氧化式生物降解双向拉伸聚丙烯材料作为印刷基膜进行印刷,通过双层共挤制得相互贴合的降解膜表层和降解处理层(2),形成外层(8);
(2)、取氧化式生物降解双向拉伸聚丙烯材料,经三层共挤得到降解处理层(2)、降解中间层(5)和降解热封层(6),构成内层(7);
(3)、通过真空镀铝的方式在内层(7)的降解处理层(2)表面镀上镀铝基层(4),并采用水性镀铝涂层涂覆以增加镀铝牢度;
(4)、通过粘合层(3)将内层(7)与外层(8)粘合固定,形成可降解膜;
(5)、取上述可降解膜,对应三层降解热封层(6)首尾热压,三边封制袋,得到成品。
6.根据权利要求5所述的环保型可降解袋的生产工艺,其特征在于:所述镀铝基层(4)的涂布干重量为0.8~1g/m2。
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