TWI836918B - Polyethylene plastic wrap - Google Patents
Polyethylene plastic wrap Download PDFInfo
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- TWI836918B TWI836918B TW112107457A TW112107457A TWI836918B TW I836918 B TWI836918 B TW I836918B TW 112107457 A TW112107457 A TW 112107457A TW 112107457 A TW112107457 A TW 112107457A TW I836918 B TWI836918 B TW I836918B
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- polyethylene
- cling film
- density polyethylene
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- inner layer
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- -1 Polyethylene Polymers 0.000 title claims abstract description 128
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 110
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 110
- 229920003023 plastic Polymers 0.000 title abstract description 9
- 239000004033 plastic Substances 0.000 title abstract description 9
- 239000010410 layer Substances 0.000 claims abstract description 52
- 229920001526 metallocene linear low density polyethylene Polymers 0.000 claims abstract description 38
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 33
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 33
- 239000002344 surface layer Substances 0.000 claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 239000000853 adhesive Substances 0.000 claims description 14
- 230000001070 adhesive effect Effects 0.000 claims description 14
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 claims description 6
- 239000000178 monomer Substances 0.000 claims description 3
- 239000003208 petroleum Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000007334 copolymerization reaction Methods 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000000806 elastomer Substances 0.000 claims 1
- 239000000463 material Substances 0.000 description 16
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 11
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 11
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 11
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 11
- 239000005642 Oleic acid Substances 0.000 description 11
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920006124 polyolefin elastomer Polymers 0.000 description 3
- 238000007655 standard test method Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000010096 film blowing Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229940049964 oleate Drugs 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- ZORQXIQZAOLNGE-UHFFFAOYSA-N 1,1-difluorocyclohexane Chemical compound FC1(F)CCCCC1 ZORQXIQZAOLNGE-UHFFFAOYSA-N 0.000 description 1
- 229920003299 Eltex® Polymers 0.000 description 1
- 229920002367 Polyisobutene Polymers 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229940035049 sorbitan monooleate Drugs 0.000 description 1
- 235000011069 sorbitan monooleate Nutrition 0.000 description 1
- 239000001593 sorbitan monooleate Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
Description
本發明涉及一種聚乙烯保鮮膜，特別是涉及一種聚乙烯保鮮膜。The present invention relates to a polyethylene fresh-keeping film, in particular to a polyethylene fresh-keeping film.
保鮮膜是一般家庭常用的廚房用品之一，可用於包裝食材或菜餚，且具有一定的保鮮效果，並可避免混雜有冰箱中的其他氣味。Plastic wrap is one of the most commonly used kitchen items in households. It can be used to wrap ingredients or dishes, has a certain fresh-keeping effect, and can prevent other odors in the refrigerator from being mixed in.
目前市面上常見保鮮膜的材質是聚乙烯。聚乙烯的質地偏軟，因此，聚乙烯保鮮膜容易因挺性（stiffness）不足，而導致在製造過程中發送性不佳以及使用時撕裂強度過高不易切割的問題。The most common plastic wrap material on the market is polyethylene. Polyethylene is relatively soft in texture, so polyethylene plastic wrap is prone to problems such as poor delivery during the manufacturing process due to insufficient stiffness and high tear strength during use, making it difficult to cut.
故，如何通過材料的改良，來改善聚乙烯保鮮膜的挺性，以克服上述的缺陷，已成為該項事業所欲解決的重要課題之一。Therefore, how to improve the stiffness of polyethylene cling film by improving the material to overcome the above-mentioned defects has become one of the important issues that the industry wants to solve.
本發明所要解決的技術問題在於，針對現有技術的不足提供一種聚乙烯保鮮膜。The technical problem to be solved by the present invention is to provide a polyethylene fresh-keeping film to address the deficiencies of the prior art.
為了解決上述的技術問題，本發明所採用的其中一技術方案是提供一種聚乙烯保鮮膜。聚乙烯保鮮膜是由低密度聚乙烯以及茂金屬線性低密度聚乙烯所形成，在聚乙烯保鮮膜的剖面結構中，聚乙烯保鮮膜具有一內層區域與一表層區域，表層區域完整包覆內層區域；其中，內層區域中添加有茂金屬線性低密度聚乙烯及低密度聚乙烯，表層區域中添加有低密度聚乙烯。In order to solve the above technical problems, one of the technical solutions adopted by the present invention is to provide a polyethylene cling film. Polyethylene cling film is made of low-density polyethylene and metallocene linear low-density polyethylene. In the cross-sectional structure of the polyethylene cling film, the polyethylene cling film has an inner layer area and a surface layer area, and the surface area is completely covered Inner layer area; wherein, metallocene linear low-density polyethylene and low-density polyethylene are added to the inner layer area, and low-density polyethylene is added to the surface area.
於一些實施例中，內層區域中的茂金屬線性低密度聚乙烯及低密度聚乙烯以連續相方式均勻混合。In some embodiments, the metallocene linear low-density polyethylene and low-density polyethylene in the inner layer region are uniformly mixed in a continuous phase.
於一些實施例中，在內層區域中，茂金屬線性低密度聚乙烯的含量為15重量百分比至30重量百分比，低密度聚乙烯的含量為70重量百分比至85重量百分比。In some embodiments, in the inner layer region, the content of metallocene linear low-density polyethylene is 15 to 30 weight percent, and the content of low-density polyethylene is 70 to 85 weight percent.
於一些實施例中，茂金屬線性低密度聚乙烯及低密度聚乙烯的熔點差值小於或等於10°C。In some embodiments, the difference in melting points of the metallocene linear low density polyethylene and the low density polyethylene is less than or equal to 10°C.
於一些實施例中，茂金屬線性低密度聚乙烯的熔點為110°C至120°C。In some embodiments, the melting point of metallocene linear low density polyethylene is 110°C to 120°C.
於一些實施例中，低密度聚乙烯的熔點為110°C至120°C。In some embodiments, the melting point of low density polyethylene is 110°C to 120°C.
於一些實施例中，茂金屬線性低密度聚乙烯是以1-己烯單體進行共聚合而形成。In some embodiments, the metallocene linear low density polyethylene is formed by copolymerizing 1-hexene monomer.
於一些實施例中，內層區域中進一步添加有一防霧劑，以聚乙烯保鮮膜的總重為100重量百分比，防霧劑的含量為0.1重量百分比至3重量百分比。In some embodiments, an anti-fog agent is further added to the inner layer area, and the total weight of the polyethylene cling film is 100 weight percent, and the content of the anti-fog agent is 0.1 to 3 weight percent.
於一些實施例中，表層區域中進一步添加有一黏劑，以聚乙烯保鮮膜的總重為100重量百分比，黏劑的含量為0.1重量百分比至2重量百分比。In some embodiments, an adhesive is further added to the surface area, and the total weight of the polyethylene cling film is 100% by weight, and the content of the adhesive is 0.1 to 2% by weight.
於一些實施例中，黏劑是選自於聚烯彈性體以及石油樹脂所組成的群組。In some embodiments, the adhesive is selected from the group consisting of polyolefin elastomers and petroleum resins.
於一些實施例中，以聚乙烯保鮮膜的總厚度為100%，內層區域占聚乙烯保鮮膜總厚度的60%至80%。In some embodiments, the total thickness of the polyethylene cling film is 100%, and the inner layer area accounts for 60% to 80% of the total thickness of the polyethylene cling film.
本發明的其中一有益效果在於，本發明所提供的聚乙烯保鮮膜，其能通過“在聚乙烯保鮮膜的剖面結構中，聚乙烯保鮮膜具有一內層區域與一表層區域”以及“內層區域中添加有茂金屬線性低密度聚乙烯及低密度聚乙烯”的技術方案，以提升聚乙烯保鮮膜的挺性，使得聚乙烯保鮮膜具有良好的發送性以方便製造，並使得聚乙烯保鮮膜具有低撕裂強度以方便使用。One of the beneficial effects of the present invention is that the polyethylene cling film provided by the present invention can improve the stiffness of the polyethylene cling film through the technical solutions of "in the cross-sectional structure of the polyethylene cling film, the polyethylene cling film has an inner layer region and a surface layer region" and "metallocene linear low-density polyethylene and low-density polyethylene are added to the inner layer region", so that the polyethylene cling film has good sendability for easy manufacturing, and the polyethylene cling film has low tear strength for easy use.
為使能更進一步瞭解本發明的特徵及技術內容，請參閱以下有關本發明的詳細說明與圖式，然而所提供的圖式僅用於提供參考與說明，並非用來對本發明加以限制。In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and illustration and are not used to limit the present invention.
以下是通過特定的具體實施例來說明本發明所公開有關“聚乙烯保鮮膜”的實施方式，本領域技術人員可由本說明書所公開的內容瞭解本發明的優點與效果。本發明可通過其他不同的具體實施例加以施行或應用，本說明書中的各項細節也可基於不同觀點與應用，在不悖離本發明的構思下進行各種修改與變更。另外，本發明的附圖僅為簡單示意說明，並非依實際尺寸的描繪，事先聲明。以下的實施方式將進一步詳細說明本發明的相關技術內容，但所公開的內容並非用以限制本發明的保護範圍。另外，本文中所使用的術語“或”，應視實際情況可能包括相關聯的列出項目中的任一個或者多個的組合。The following is an explanation of the implementation of the "polyethylene cling film" disclosed in the present invention through specific concrete embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed in various ways based on different viewpoints and applications without deviating from the concept of the present invention. In addition, the drawings of the present invention are only for simple schematic illustrations and are not depicted in actual size. Please note in advance. The following implementation will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention. In addition, the term "or" used in this article may include any one or more combinations of the related listed items depending on the actual situation.
為了克服現有聚乙烯保鮮膜挺性不足，而不利於製造與使用的問題，本發明提供一種聚乙烯保鮮膜。經ASTM-D1922標準測試方法測量，本發明的聚乙烯保鮮膜的撕裂強度（tearing strength）為30 g至70 g。經ASTM-D882標準測試方法測量，本發明的聚乙烯保鮮膜的楊氏係數（Young's modulus）為12 kg/mm 2至20 kg/mm 2。如此一來，聚乙烯保鮮膜具有方便切割的優勢。並且，聚乙烯保鮮膜可維持低霧度的特性，不會因挺性的增加，而影響聚乙烯保鮮膜的透明度。 In order to overcome the problem that the existing polyethylene cling film has insufficient stiffness and is not conducive to manufacturing and use, the present invention provides a polyethylene cling film. As measured by the ASTM-D1922 standard test method, the polyethylene cling film of the present invention has a tearing strength of 30 g to 70 g. As measured by the ASTM-D882 standard test method, the Young's modulus of the polyethylene cling film of the present invention is 12 kg/mm 2 to 20 kg/mm 2 . In this way, polyethylene cling film has the advantage of being easy to cut. Moreover, the polyethylene cling film can maintain low haze characteristics, and the increase in stiffness will not affect the transparency of the polyethylene cling film.
本發明的聚乙烯保鮮膜，是由低密度聚乙烯（low density polyethylene，LDPE）以及茂金屬線性低密度聚乙烯（metallocene linear low density polyethylene，mLLDPE）所形成。茂金屬線性低密度聚乙烯的添加，可使聚乙烯保鮮膜具有較高的挺性，並可保有原有的透明度。The polyethylene cling film of the present invention is formed of low density polyethylene (LDPE) and metallocene linear low density polyethylene (mLLDPE). The addition of metallocene linear low-density polyethylene can make the polyethylene cling film have higher stiffness and maintain its original transparency.
以聚乙烯保鮮膜的總重為100重量百分比，低密度聚乙烯的含量為80重量百分比至90重量百分比，茂金屬線性低密度聚乙烯的含量為10重量百分比至20重量百分比。Taking the total weight of the polyethylene cling film as 100 weight percent, the content of the low-density polyethylene is 80 weight percent to 90 weight percent, and the content of the metallocene linear low-density polyethylene is 10 weight percent to 20 weight percent.
為了改善聚乙烯保鮮膜的挺性，本發明選用特定熔點範圍的低密度聚乙烯以及特定熔點範圍的茂金屬線性低密度聚乙烯。通過控制聚乙烯的熔點範圍，可達到控制聚乙烯結晶性的效果，故可達到提升聚乙烯保鮮膜的挺性的效果。In order to improve the stiffness of polyethylene cling film, the present invention uses low-density polyethylene in a specific melting point range and metallocene linear low-density polyethylene in a specific melting point range. By controlling the melting point range of polyethylene, the effect of controlling the crystallinity of polyethylene can be achieved, so the stiffness of polyethylene cling film can be improved.
具體來說，低密度聚乙烯的熔點範圍為110°C至120°C。於一些實施例中，低密度聚乙烯的密度為0.92克/立方公分至0.93克/立方公分。然而，本發明不以此為限。於一示範實施例中，茂金屬線性低密度聚乙烯的熔點範圍可以為110°C至120°C。Specifically, low-density polyethylene has a melting point ranging from 110°C to 120°C. In some embodiments, the density of low-density polyethylene is 0.92 g/cm3 to 0.93 g/cm3. However, the present invention is not limited thereto. In an exemplary embodiment, the melting point of the metallocene linear low-density polyethylene may range from 110°C to 120°C.
當低密度聚乙烯的熔點範圍與茂金屬線性低密度聚乙烯的熔點範圍相近時，低密度聚乙烯與茂金屬線性低密度聚乙烯可具有良好的相容性。於一示範實施例中，茂金屬線性低密度聚乙烯及低密度聚乙烯的熔點差值小於或等於10°C。較佳的，茂金屬線性低密度聚乙烯及低密度聚乙烯的熔點差值小於或等於5°C。When the melting point range of low-density polyethylene is similar to that of metallocene linear low-density polyethylene, low-density polyethylene and metallocene linear low-density polyethylene may have good compatibility. In an exemplary embodiment, the difference in melting point between metallocene linear low-density polyethylene and low-density polyethylene is less than or equal to 10°C. Preferably, the difference in melting point between metallocene linear low-density polyethylene and low-density polyethylene is less than or equal to 5°C.
具體來說，茂金屬線性低密度聚乙烯可以是1-己烯單體進行共聚合而形成，例如商品型號：LyondellBasell Luflexen系列、ExxonMobil Exceed系列、ExxonMobil Enable系列、Ineos Eltex系列。Specifically, metallocene linear low-density polyethylene can be formed by copolymerization of 1-hexene monomer, such as commercial models: LyondellBasell Luflexen series, ExxonMobil Exceed series, ExxonMobil Enable series, Ineos Eltex series.
為了符合用途需求，一般會於保鮮膜中添加一些功能助劑，使得保鮮膜可具有良好的透明性、防霧性及包裝性（以下簡稱功能特性）。In order to meet the requirements of use, some functional additives are generally added to the cling film to make the cling film have good transparency, anti-fogging and packaging properties (hereinafter referred to as functional properties).
本發明添加了茂金屬線性低密度聚乙烯，可提升聚乙烯保鮮膜的挺性，又為了不改變聚乙烯保鮮膜原有的功能特性，本發明可選擇將茂金屬線性低密度聚乙烯加於聚乙烯保鮮膜的特定區域。如此一來，本發明的聚乙烯保鮮膜可在保有功能特性的前提下，具備更佳的挺性。The present invention adds metallocene linear low-density polyethylene, which can improve the stiffness of the polyethylene cling film. In order not to change the original functional characteristics of the polyethylene cling film, the present invention can choose to add metallocene linear low-density polyethylene to the polyethylene cling film. Specific areas of polyethylene cling film. In this way, the polyethylene cling film of the present invention can have better stiffness while maintaining functional properties.
請合併參閱圖1及圖2所示，本發明的聚乙烯保鮮膜Z在剖面結構中具有一內層區域1與一表層區域2，表層區域2完整包覆內層區域1。Please refer to FIG. 1 and FIG. 2 together. The polyethylene cling film Z of the present invention has an
值得說明的是，形成內層區域1與表層區域2的材料大致相同，皆是以低密度聚乙烯作為主材料。內層區域1與表層區域2的差異在於：內層區域1中添加有茂金屬線性低密度聚乙烯，而表層區域2未添加茂金屬線性低密度聚乙烯。It is worth noting that the materials forming the
因此，就產品外觀而言，內層區域1與表層區域2是一體成形，但實際去分析含有的成分，便可將聚乙烯保鮮膜Z區分為內層區域1與表層區域2。在內層區域1中，低密度聚乙烯與茂金屬線性低密度聚乙烯均勻混合，並在內層區域1中構成連續相。Therefore, in terms of product appearance, the
就產品特性而言，聚乙烯保鮮膜Z具有與一般保鮮膜相近的功能特性，但因內層區域1與表層區域2的成分差異，使得本發明的聚乙烯保鮮膜Z具有更佳的挺性。也就是說，通過以材料區分內層區域1與表層區域2，可使得本發明的聚乙烯保鮮膜Z在保有原有功能特性的前提下，具備更佳的挺性。In terms of product characteristics, polyethylene cling film Z has similar functional properties to general cling film. However, due to the composition difference between the
由於內層區域1可提供支撐的作用，故聚乙烯保鮮膜Z可具有較薄的厚度。於一示範實施例中，聚乙烯保鮮膜Z的厚度為7微米至11微米，例如：8微米、9微米或10微米。Since the
另外，以聚乙烯保鮮膜Z的總厚度為100%，內層區域1占聚乙烯保鮮膜Z的總厚度的60%至80%。在此厚度比例的條件下，內層區域1可提供良好的支撐作用，又可保有表層區域2的功能特性。In addition, when the total thickness of the polyethylene cling film Z is 100%, the
為了防止聚乙烯保鮮膜Z在低溫環境（冷藏狀態）產生霧氣，可於聚乙烯保鮮膜Z中添加一防霧劑。In order to prevent the polyethylene cling film Z from fogging in a low temperature environment (refrigerated state), an anti-fogging agent can be added to the polyethylene cling film Z.
於一示範實施例中，內層區域1進一步包括一防霧劑。以聚乙烯保鮮膜Z的總重為100重量百分比，防霧劑的含量為0.1重量百分比至1重量百分比。In an exemplary embodiment, the
值得說明的是，防霧劑無法與低密度聚乙烯或茂金屬線性低密度聚乙烯完全相容。經長時間後，防霧劑會由內層區域1慢慢移行至表層區域2，最後移行至聚乙烯保鮮膜Z的表面，進而失去作用。因此，本發明將防霧劑添加於內層區域1，可延長聚乙烯保鮮膜Z的防霧效果。It is worth noting that anti-fogging agents are not completely compatible with low-density polyethylene or metallocene linear low-density polyethylene. After a long time, the anti-fogging agent will slowly move from the
舉例來說，內層區域1中添加的防霧劑可以是一油酸酯類化合物，例如：油酸酯類化合物可以是山梨糖醇酐單油酸酯（sorbitan monooleate）。較佳的，油酸酯類化合物的分子量可以是350克/莫耳至450克/莫耳，舉例來說，油酸酯類化合物的分子量可以是375克/莫耳、400克/莫耳或425克/莫耳。通過控制油酸酯類化合物的分子量，可延長油酸酯類化合物移行至聚乙烯保鮮膜Z的表面的時間。For example, the anti-fogging agent added in the
於另一示範實施例中，除了在內層區域1中添加的防霧劑之外，也可同時於表層區域2添加另一防霧劑。表層區域2中添加的防霧劑可以是一醚類化合物。醚類化合物的分子量可以為150克/莫耳至250克/莫耳，舉例來說，醚類化合物的分子量可以為175克/莫耳、200克/莫耳或225克/莫耳。In another exemplary embodiment, in addition to the anti-fog agent added to the
油酸酯類化合物與醚類化合物分布於不同區域，故也會影響油酸酯類化合物與醚類化合物存在於聚乙烯保鮮膜Z中的時間。油酸酯類化合物位於內層區域1，故相較於位於表層區域2的醚類化合物，可在可堆肥保鮮膜Z中存在較久的時間。另外，本發明通過分子量的控制，使內層區域1中的油酸酯類化合物以及表層區域2中的醚類化合物，共同維持聚乙烯保鮮膜Z的防霧性。Oleic acid ester compounds and etheric acid compounds are distributed in different regions, which will also affect the time that oleic acid ester compounds and etheric acid compounds exist in the polyethylene cling film Z. Oleic acid ester compounds are located in the
在此示範實施例中，即便醚類化合物已經移行至聚乙烯保鮮膜Z的表面，聚乙烯保鮮膜Z中仍具有油酸酯類化合物。因此，使油酸酯類化合物與醚類化合物各自分布於聚乙烯保鮮膜Z的不同區域（內層區域1及表層區域2），可達到延長聚乙烯保鮮膜Z的防霧效果。In this exemplary embodiment, even if the ether compound has migrated to the surface of the polyethylene cling film Z, the polyethylene cling film Z still has the oleate compound. Therefore, by distributing the oleate compound and the ether compound in different regions (the
在此示範實施例中，以聚乙烯保鮮膜Z的總重為100重量百分比，油酸酯類化合物的含量為0.1重量百分比至1.0重量百分比，醚類化合物的含量為0.1重量百分比至1.0重量百分比。In this exemplary embodiment, the total weight of the polyethylene cling film Z is 100 weight percent, the content of the oleic acid ester compound is 0.1 to 1.0 weight percent, and the content of the ether compound is 0.1 to 1.0 weight percent. .
為了使聚乙烯保鮮膜Z的表面具有一定程度的黏性，而可用於包覆容器或包裝食材，可於聚乙烯保鮮膜Z中添加一黏劑。由於方便包裝是聚乙烯保鮮膜Z的表面特性，故只需於表層區域2添加黏劑即可。因此，本發明只於特定區域添加特定成分的技術手段，可達到減少黏劑使用量的效果。In order to make the surface of the polyethylene cling film Z have a certain degree of stickiness so that it can be used to cover containers or package food, an adhesive can be added to the polyethylene cling film Z. Since convenient packaging is the surface characteristic of polyethylene cling film Z, adhesive only needs to be added to
於一示範實施例中，表層區域2進一步包括一黏劑。以聚乙烯保鮮膜Z的總重為100重量百分比，黏劑的含量為0.1重量百分比至2重量百分比。舉例來說，黏劑可以是選自於聚烯彈性體（polyolefin elastomer，POE）以及石油樹脂所組成的群組，例如：聚異丁烯，但本發明不以此為限。In an exemplary embodiment, the
聚乙烯保鮮膜Z可以是通過流延押出或吹膜的方式製成。Polyethylene cling film Z can be made by cast extrusion or blown film.
在流延押出製程中，使用秤量飼機（lost in weight feeder）稱取特定含量的膠粒，以混合機熔融混合，內層材料以及表層材料分別經過單螺桿押出熔融，經過T die成型模具，形成由表層、內層及表層構成的三層結構。In the cast extrusion process, a lost in weight feeder is used to weigh a specific amount of pellets, which are then melt-mixed in a mixer. The inner layer material and the surface layer material are melted by a single-screw extruder and passed through a T-die molding mold to form a three-layer structure consisting of the surface layer, inner layer, and surface layer.
在吹膜製程中，使用秤量飼機稱取特定含量的膠粒，並以混合機熔融混合，內層材料以及表層材料分別經過單螺桿押出熔融。接著，依照幅寬控制押出機的轉速，並調整冷卻風的風量及溫度，以向上吹膜的方式製膜。經吹膜、切割後，使用夾輪固定膜層，控制輪具速度引取膜層，並控制膜捲張力進行前後膜的收捲，便可獲得由表層、內層及表層構成的三層結構。In the blown film process, a weighing machine is used to weigh a specific content of rubber particles, and the mixer is used to melt and mix. The inner layer material and the surface layer material are extruded and melted through a single screw respectively. Then, the speed of the extruder is controlled according to the width, and the volume and temperature of the cooling air are adjusted to produce the film by blowing the film upward. After film blowing and cutting, use the clamp wheel to fix the film layer, control the speed of the wheel to pull out the film layer, and control the tension of the film roll to wind up the front and rear films, so that a three-layer structure consisting of the surface layer, the inner layer and the surface layer can be obtained.
在製成內層膜及表層膜之後，將內層膜設置於兩層表層膜之間，以共壓出的方式層合製得聚乙烯保鮮膜Z。由於內層膜與表層膜具有相似的材質，共壓出後會融為一體，且內層膜會包覆於兩層表層膜之間。其中，內層膜構成內層區域1，而兩層外層膜合併構成表層區域2。After the inner film and the surface film are made, the inner film is placed between the two surface films and laminated by co-extrusion to obtain the polyethylene cling film Z. Since the inner film and the surface film have similar materials, they will be integrated after co-extrusion, and the inner film will be wrapped between the two surface films. The inner film constitutes the
為了證實本發明的聚乙烯保鮮膜Z可兼具功能性以及適當的挺性，根據表1的配方，並依序通過上述流延步驟（或吹膜步驟）以及共壓出步驟，製得實施例1至3的聚乙烯保鮮膜Z以及比較例1、2的保鮮膜。In order to prove that the polyethylene cling film Z of the present invention can have both functionality and appropriate stiffness, polyethylene cling films Z of Examples 1 to 3 and cling films of Comparative Examples 1 and 2 were prepared according to the formulation in Table 1 and sequentially through the above-mentioned casting step (or film blowing step) and co-extrusion step.
接著，測量實施例1至3的聚乙烯保鮮膜以及比較例1至2的保鮮膜的物理特性，並將測量結果列於表2中。表2中的特性是根據ASTM-D1922標準測量聚乙烯保鮮膜的撕裂強度，另根據ASTM-D822標準測試方法測量聚乙烯保鮮膜的楊氏係數（Young's modulus）。Next, the physical properties of the polyethylene cling films of Examples 1 to 3 and the cling films of Comparative Examples 1 to 2 were measured, and the measurement results are listed in Table 2. The characteristics in Table 2 are based on the tear strength of polyethylene cling film measured according to the ASTM-D1922 standard, and the Young's modulus of the polyethylene cling film measured according to the ASTM-D822 standard test method.
表1
表2
根據表1、表2的結果可得知，在內層材料中添加15至30重量百分比的茂金屬線性低密度聚乙烯，能有效提升薄膜的楊氏係數，並降低撕裂強度。因此，本發明的聚乙烯保鮮膜具有良好的發送性和切割性，並同時能維持薄膜霧度於2%以下。According to the results in Table 1 and Table 2, it can be known that adding 15 to 30 weight percent of metallocene linear low-density polyethylene to the inner layer material can effectively increase the Young's coefficient of the film and reduce the tear strength. Therefore, the polyethylene cling film of the present invention has good spreading properties and cutting properties, and at the same time can maintain the film haze below 2%.
根據比較例1的結果，未於內層材料中添加茂金屬線性低密度聚乙烯時，無法提升聚乙烯保鮮膜的伸長率及楊氏係數，且聚乙烯保鮮膜的撕裂強度過高，而不利於使用。According to the results of Comparative Example 1, when metallocene linear low-density polyethylene is not added to the inner layer material, the elongation and Young's modulus of the polyethylene cling film cannot be improved, and the tear strength of the polyethylene cling film is too high, which is not conducive to use.
根據比較例2的結果，當表層材料中黏劑的含量過高時，會負面影響聚乙烯保鮮膜的發送性。當內層材料中防霧劑的含量過低時，聚乙烯保鮮膜的防霧效果較差。According to the results of Comparative Example 2, when the adhesive content in the surface material is too high, it will negatively affect the spreadability of the polyethylene cling film. When the content of anti-fogging agent in the inner layer material is too low, the anti-fogging effect of polyethylene cling film is poor.
[實施例的有益效果][Beneficial effects of the embodiment]
本發明的其中一有益效果在於，本發明所提供的聚乙烯保鮮膜，其能通過“在聚乙烯保鮮膜的剖面結構中，聚乙烯保鮮膜具有一內層區域與一表層區域”以及“內層區域中添加有茂金屬線性低密度聚乙烯及低密度聚乙烯”的技術方案，以提升聚乙烯保鮮膜的挺性，使得聚乙烯保鮮膜具有良好的發送性以方便製造，並使得聚乙烯保鮮膜具有低撕裂強度以方便使用。One of the beneficial effects of the present invention is that the polyethylene cling film provided by the invention can pass through "in the cross-sectional structure of the polyethylene cling film, the polyethylene cling film has an inner layer area and a surface layer area" and "the inner layer The technical solution of "adding metallocene linear low-density polyethylene and low-density polyethylene" to the layer area to improve the stiffness of the polyethylene cling film makes the polyethylene cling film have good transportability to facilitate manufacturing, and makes the polyethylene cling film Plastic wrap has low tear strength for ease of use.
以上所公開的內容僅為本發明的優選可行實施例，並非因此侷限本發明的申請專利範圍，所以凡是運用本發明說明書及圖式內容所做的等效技術變化，均包含於本發明的申請專利範圍內。The contents disclosed above are only preferred and feasible embodiments of the present invention, and do not limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.
Z:聚乙烯保鮮膜 1:內層區域 2:表層區域 Z: Polyethylene cling film 1: Inner layer area 2: Surface layer area
圖1為本發明聚乙烯保鮮膜的立體示意圖。Figure 1 is a schematic three-dimensional view of the polyethylene cling film of the present invention.
圖2為圖1的II-II截線的剖面示意圖。FIG. 2 is a schematic cross-sectional view along line II-II in FIG. 1 .
Z:聚乙烯保鮮膜 Z: Polyethylene cling film
Claims (9)
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| CN102675722A (en) * | 2012-05-17 | 2012-09-19 | 厦门聚富塑胶制品有限公司 | Anti-fogging preservative film |
| CN107531035A (en) * | 2015-03-17 | 2018-01-02 | 埃克森美孚化学专利公司 | Multilayer film and its manufacture method |
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| CN102675722A (en) * | 2012-05-17 | 2012-09-19 | 厦门聚富塑胶制品有限公司 | Anti-fogging preservative film |
| CN107531035A (en) * | 2015-03-17 | 2018-01-02 | 埃克森美孚化学专利公司 | Multilayer film and its manufacture method |
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