TWI777888B - 可回收複合夾鏈袋及其製備方法 - Google Patents

可回收複合夾鏈袋及其製備方法 Download PDF

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TWI777888B
TWI777888B TW111101020A TW111101020A TWI777888B TW I777888 B TWI777888 B TW I777888B TW 111101020 A TW111101020 A TW 111101020A TW 111101020 A TW111101020 A TW 111101020A TW I777888 B TWI777888 B TW I777888B
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composite
film
outer layer
polyethylene
inner layer
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TW202327749A (zh
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李佳玲
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舒美興業股份有限公司
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Priority to US17/689,187 priority patent/US20230219731A1/en
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Abstract

本發明提供了一種可回收複合夾鏈袋及其製備方法，其中可回收複合夾鏈袋的袋體是由二複合薄膜以其至少二個側邊相互熱封接合而成，而每一複合薄膜包括外層和內層，外層為雙向拉伸聚乙烯(BOPE)薄膜，內層為回收聚乙烯(PCR PE)薄膜，而外層與內層相互複合在一起。藉由使用BOPE和PCR PE的複合薄膜，可提升可回收複合夾鏈袋的抗衝擊和耐穿刺之能力，同時有利於回收再利用。本發明進一步針對可回收複合夾鏈袋的製備方法，將複合薄膜的熱封溫度調控在120〜130℃，可有效避免起皺現象的發生，從而提高產品良率。

Description

可回收複合夾鏈袋及其製備方法
本發明係有關包裝袋領域，特別是指一種可回收複合夾鏈袋及其製備方法。
目前市場上的包裝袋，常採用延展性佳的聚乙烯(Polyethylene, PE)薄膜來製作，但是由於聚乙烯薄膜不耐應力，其抗穿刺力較差。例如，以傳統聚乙烯材質所製成之夾鏈袋，用於包裝牙線棒易被牙線棒尖銳部位刺穿，而造成破損。為了提高抗穿刺能力，通常使用不同材料的薄膜進行複合來製得複合夾鏈袋，例如，使用聚對苯二甲酸乙二酯（PET）和聚乙烯，則因為複合夾鏈袋包含不同材料不易分離，難以回收再利用。
而為了促進環保發展，有的複合夾鏈袋會使用回收聚乙烯(PCR PE)的再生材料，而回收聚乙烯因回收來源較為複雜，且回收再製的聚乙烯物性相較一般聚乙烯不穩定，所以目前回收聚乙烯材料並沒有與其他材料來製作複合夾鏈袋。同時，更因為回收聚乙烯混入了各種不同軟硬、密度、耐熱溫度特性的聚乙烯，對於使用回收聚乙烯和其他材料複合的複合夾鏈袋來說，其袋體邊緣在熱封過程容易發生起皺的現象，從而影響印刷套準或造成規格不一致，使得產品良率下降。
因此，亟需尋求一種耐穿刺、易回收且產品良率提高的可回收複合夾鏈袋及其製備方法，以解決此技術領域現今所面臨的難題。
有鑑於此，本發明的主要目的在於提供一種可回收複合夾鏈袋及其製備方法，可回收複合夾鏈袋採用雙向拉伸聚乙烯(BOPE)薄膜和回收聚乙烯(PCR PE)薄膜的複合薄膜製作袋體，來提升抗衝擊和耐穿刺之能力，並可達到可回收再利用的目的。
本發明的另一目的在於提供一種可回收複合夾鏈袋及其製備方法，將熱封溫度調控在120〜130℃，可有效避免起皺現象的發生，從而提高產品良率。
為達上述之目的，本發明提供一種可回收複合夾鏈袋，其包括袋體和設於袋體頂端的夾鏈部，袋體是由二複合薄膜以其至少二個側邊相互熱封接合而成。每一複合薄膜包括外層和內層，外層為雙向拉伸聚乙烯薄膜，內層為回收聚乙烯薄膜，外層與內層相互複合在一起；其中，二複合薄膜的內層彼此相對。
本發明也提供一種可回收複合夾鏈袋的製備方法，其步驟包括： 1)    提供二複合薄膜，每一複合薄膜包括外層和內層，其中外層為雙向拉伸聚乙烯薄膜，內層為回收聚乙烯薄膜，外層與內層相互複合在一起； 2)    將二複合薄膜押製形成一袋體； 3)    於袋體頂端設置一夾鏈部；及 4)    將袋體的至少二個側邊進行熱封接合，熱封溫度為120〜130℃。
根據本發明之實施例，前述步驟1)包括：於外層內側進行印刷，再將印刷好的外層和內層藉由膠水或加熱以複合在一起。
根據本發明之實施例，前述回收聚乙烯薄膜的材質包括高密度聚乙烯(HDPE)、中密度聚乙烯(MDPE) 、低密度聚乙烯(LDPE) 、超低密度聚乙烯(ULDPE)及線性低密度聚乙烯（LLDPE）中的至少一種。
根據本發明之實施例，前述每一複合薄膜中外層與內層所佔用量為30重量％：70重量％〜40重量％：60重量％。
根據本發明之實施例，前述內層的厚度為20〜100微米(μm)，前述外層的厚度為15〜70微米。
與先前技術相比，本發明具有以下優勢： （1）     本發明提供的可回收複合夾鏈袋使用雙向拉伸聚乙烯薄膜，增加了聚乙烯包裝產品的耐衝擊和抗穿刺能力。 （2）     本發明使用的雙向拉伸聚乙烯薄膜和回收聚乙烯薄膜的複合薄膜，因為雙向拉伸聚乙烯和回收聚乙烯皆同為聚乙烯材料，可以直接回收再利用，且回收聚乙烯屬於再生材料，能夠達到減塑及永續發展的理想目標。 （3）     本發明提供的可回收複合夾鏈袋的製程簡易，設計比封合一般聚乙烯稍高的溫度範圍，即可避免起皺問題，可以成功作成雙向拉伸聚乙烯薄膜和回收聚乙烯薄膜複合的夾鏈袋。
底下藉由具體實施例詳加說明，當更容易瞭解本發明之目的、技術內容、特點及其所達成之功效。
本發明之實施例將藉由下文配合相關圖式進一步加以解說。盡可能的，於圖式與說明書中，相同標號代表相同或相似構件。於圖式中，基於簡化與方便標示，形狀與厚度可能經過誇大表示。可以理解的是，未特別顯示於圖式中或描述於說明書中之元件，為所屬技術領域中具有通常知識者所知之形態。本領域中具有通常知識者可依據本發明之內容而進行多種之改變與修改。
請參照第1圖和第2圖，其分別繪示本發明之實施例的可回收複合夾鏈袋1的結構示意圖和袋體10的剖面圖。
本實施例中，可回收複合夾鏈袋1包括袋體10和夾鏈部20，袋體10頂端具有開口101，夾鏈部20設置於袋體10的頂端接近開口101處。袋體10頂端之外具有三個側邊102，而袋體10是由二複合薄膜110、120以其至少二個側邊102相互熱封接合而成，圖中是以三個側邊102熱封接合為示意。其中，複合薄膜110包括外層111與內層112，外層111與內層112相互複合在一起，而複合薄膜120包括外層121與內層122，外層121與內層122相互複合在一起。且外層111、121為雙向拉伸聚乙烯(BOPE)薄膜，內層112、122為回收聚乙烯(PCR PE)薄膜，其中雙向拉伸聚乙烯薄膜容易印刷，並可增加抗衝擊和耐穿刺能力。複合薄膜110的內層112和複合薄膜120的內層122彼此相對疊合。
具體地，在每一複合薄膜110、120中外層111、121與內層112、122所佔用量大約為30重量％：70重量％〜40重量％：60重量％。具體地，在每一複合薄膜110、120中內層112、122的厚度為20〜100微米(μm)，外層111、121的厚度為15〜70微米。
本發明所使用的回收聚乙烯薄膜是利用再生材料來製作，因回收來源較複雜，其可能混合各種類型的聚乙烯材料，且回收再製的聚乙烯材料的物性和化性相較單一種回收的聚乙烯材料不穩定，故使用120〜130℃的熱封溫度來進行封合，可以避免複合薄膜在熱封側邊時發生起皺的情況。具體地，回收聚乙烯薄膜的材質可包括高密度聚乙烯(HDPE)、中密度聚乙烯(MDPE) 、低密度聚乙烯(LDPE) 、超低密度聚乙烯(ULDPE)及線性低密度聚乙烯（LLDPE）中的至少一種，但不限於此。本發明的複合薄膜之外層所使用的雙向拉伸聚乙烯薄膜，以及內層所使用的回收聚乙烯薄膜，均歸類為聚乙烯材質，因此，在回收時無須先將外層和內層進行分離，而可直接一起回收再利用。
請參照第3圖，其說明本發明之實施例的可回收複合夾鏈袋1的製備方法的各個步驟，包括：
步驟1）分別取得雙向拉伸聚乙烯薄膜和回收聚乙烯薄膜，將雙向拉伸聚乙烯薄膜內側進行印刷，再將印刷好的雙向拉伸聚乙烯薄膜和回收聚乙烯薄膜藉由膠水或加熱(本實施例為220℃)以複合在一起而形成如第2圖所示之複合薄膜110或120。提供二複合薄膜110、120，每一複合薄膜110、120之結構包括外層111、121和內層112、122，其中外層111、121為雙向拉伸聚乙烯薄膜，內層112、122為回收聚乙烯薄膜。本實施例中，每一複合薄膜110、120中外層111、121與內層112、122所佔用量大約為38.46重量％：61.54重量％。
步驟2）將二複合薄膜110、120先進行裁切，然後，利用製袋機將二複合薄膜110、120押製形成如第1圖所示之袋體10。
步驟3）於袋體10頂端接近開口101處放置一夾鏈部20，利用超聲波融合方式將夾鏈部20結合於二複合薄膜110、120上。
步驟4）將袋體10的二個側邊102進行熱封接合，熱封溫度為120〜130℃。
步驟5）將袋體10進行裁切，打上吊孔，而完成可回收複合夾鏈袋1之產品。本實施例所製得的可回收複合夾鏈袋1之長度可達205mm，寬度可達260mm。
另外，為了說明和驗證本發明提出的可回收複合夾鏈袋所能達到之技術效果而進行下列試驗。
本發明之試驗方法首先是針對複合薄膜中採用不同比例的回收聚乙烯薄膜，測量袋體的封合側邊之抗撕開力，並觀察袋體有無起皺的現象，其結果如表一所示。可發現本發明所揭露的可回收複合夾鏈袋確實可克服袋體在側邊熱封後容易起皺的問題，同時其具有高的抗撕開力。
表一
PCR PE所佔比例(%) 封合側邊抗撕開力 袋體有無起皺
70% ＞100N 無
50% ＞100N 無
30% ＞100N 無
10% ＞100N 無
接著，本發明對於不同薄膜組成所製作的夾鏈袋測試其套印位移，其結果如表二所示。可發現本發明所揭露的可回收複合夾鏈袋使用結合雙向拉伸聚乙烯薄膜和回收聚乙烯薄膜的複合薄膜，其套版印刷位移最小。
表二
薄膜組成 套印刷板位移
BOPE+PCR PE (本發明) ＜2mm
PE+PE ＞5mm
PE+PCR PE ＞5mm
另外，本發明還對於不同薄膜材料所製作的夾鏈袋測試其抗穿刺能力，刺針材質為PP，其直徑為1mm，穿刺力為10N，測試結果如表三所示。可發現本發明所揭露的可回收複合夾鏈袋使用結合雙向拉伸聚乙烯薄膜和回收聚乙烯薄膜的複合薄膜，其所製成之袋體的抗穿刺效果最佳，不容易被尖銳物品刺破。
表三
薄膜組成 抗穿刺效果
BOPE+PCR PE (本發明) 袋體未被刺穿
PE+PE 袋體被刺穿
PE+PCR PE 袋體被刺穿
綜上所述，根據本發明所提供之可回收複合夾鏈袋及其製備方法，將可回收複合夾鏈袋的袋體由二複合薄膜以其至少二個側邊相互熱封接合而成，而每一複合薄膜的外層和內層分別是由雙向拉伸聚乙烯薄膜和回收聚乙烯薄膜所複合而成。此種複合薄膜具有高的抗衝擊和耐穿刺能力，不容易被尖銳物品刺破，適合作為例如為牙線棒之包裝使用，且複合薄膜的結構皆屬於聚乙烯材料，並且利用到再生材料，非常有利於進一步回收再利用，可實現減塑和永續發展的理想目標。而就可回收複合夾鏈袋的製備而言，本發明的製程簡易，將複合薄膜的熱封溫度調控在120〜130℃，可以有效達到熔點，又不致於因為溫度太高所產生的負面影響，可以避免起皺現象，不會產生套印不準的問題，並成功作成雙向拉伸聚乙烯薄膜和回收聚乙烯薄膜複合的夾鏈袋，使產品良率得以提升，從而大幅提高產業競爭力。
唯以上所述者，僅為本發明之較佳實施例而已，並非用來限定本發明實施之範圍。故即凡依本發明申請範圍所述之特徵及精神所為之均等變化或修飾，均應包括於本發明之申請專利範圍內。
1:可回收複合夾鏈袋 10:袋體 101:開口 102:側邊 110:複合薄膜 111:外層 112:內層 120:複合薄膜 121:外層 122:內層 20:夾鏈部
第1圖為本發明之實施例的可回收複合夾鏈袋的結構示意圖。 第2圖為本發明之實施例的袋體的剖面圖。 第3圖為本發明之實施例的可回收複合夾鏈袋的製備方法的流程圖。
10:袋體
110:複合薄膜
111:外層
112:內層
120:複合薄膜
121:外層
122:內層

Claims (8)

  1. 一種可回收複合夾鏈袋，包括一袋體和設於該袋體頂端的一夾鏈部，該袋體由二複合薄膜以其至少二個側邊相互熱封接合而成，其特徵在於：每一複合薄膜包括：一外層，該外層為雙向拉伸聚乙烯(BOPE)薄膜；及一內層，該內層為回收聚乙烯(PCR PE)薄膜，該外層與該內層相互複合在一起；其中，該二複合薄膜的內層彼此相對，每一複合薄膜中該外層與該內層所佔用量為30重量%：70重量%~40重量%：60重量%。
  2. 如請求項1所述之可回收複合夾鏈袋，其中該二複合薄膜的熱封溫度為120~130℃。
  3. 如請求項1所述之可回收複合夾鏈袋，其中該回收聚乙烯薄膜的材質包括高密度聚乙烯(HDPE)、中密度聚乙烯(MDPE)、低密度聚乙烯(LDPE)、超低密度聚乙烯(ULDPE)及線性低密度聚乙烯(LLDPE)中的至少一種。
  4. 如請求項1所述之可回收複合夾鏈袋，其中該內層的厚度為20~100微米(μm)，該外層的厚度為15~70微米。
  5. 一種可回收複合夾鏈袋的製備方法，其包括下列步驟：1)提供二複合薄膜，每一複合薄膜包括：一外層，該外層為雙向拉伸聚乙烯(BOPE)薄膜；及一內層，該內層為回收聚乙烯(PCR PE)薄膜，該外層與該內層相互複合在一起；其中，每一複合薄膜中該外層與該內層所佔用量為30重量%：70重量%~40重量%：60重量%；2)將該二複合薄膜押製形成一袋體； 3)於該袋體頂端設置一夾鏈部；及4)將該袋體的至少二個側邊進行熱封接合，熱封溫度為120~130℃。
  6. 如請求項5所述之可回收複合夾鏈袋的製備方法，其中於該步驟1)包括：於該外層內側進行印刷，再將印刷好的該外層和該內層藉由膠水或加熱以複合在一起。
  7. 如請求項5所述之可回收複合夾鏈袋的製備方法，其中該回收聚乙烯薄膜的材質包括高密度聚乙烯(HDPE)、中密度聚乙烯(MDPE)、低密度聚乙烯(LDPE)、超低密度聚乙烯(ULDPE)及線性低密度聚乙烯(LLDPE)中的至少一種。
  8. 如請求項5所述之可回收複合夾鏈袋的製備方法，其中該內層的厚度為20~100微米(μm)，該外層的厚度為15~70微米。
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