JP2021161293A - Film containing recycled polyethylene resin - Google Patents
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- JP2021161293A JP2021161293A JP2020065435A JP2020065435A JP2021161293A JP 2021161293 A JP2021161293 A JP 2021161293A JP 2020065435 A JP2020065435 A JP 2020065435A JP 2020065435 A JP2020065435 A JP 2020065435A JP 2021161293 A JP2021161293 A JP 2021161293A
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- 229920013716 polyethylene resin Polymers 0.000 title claims abstract description 24
- 239000002216 antistatic agent Substances 0.000 claims abstract description 14
- 239000011342 resin composition Substances 0.000 claims abstract description 9
- 239000000155 melt Substances 0.000 claims abstract description 5
- 229920005678 polyethylene based resin Polymers 0.000 claims description 13
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 7
- 239000005977 Ethylene Substances 0.000 claims description 7
- 239000004711 α-olefin Substances 0.000 claims description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
- 229920001577 copolymer Polymers 0.000 claims description 4
- 229920005989 resin Polymers 0.000 abstract description 42
- 239000011347 resin Substances 0.000 abstract description 42
- 239000005022 packaging material Substances 0.000 abstract description 12
- 239000000470 constituent Substances 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 12
- 238000004806 packaging method and process Methods 0.000 description 9
- 239000002699 waste material Substances 0.000 description 9
- 239000004698 Polyethylene Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 6
- -1 polyethylene Polymers 0.000 description 6
- 229920000573 polyethylene Polymers 0.000 description 6
- 239000013502 plastic waste Substances 0.000 description 5
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 4
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 229920000098 polyolefin Polymers 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 1
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229920004889 linear high-density polyethylene Polymers 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000012968 metallocene catalyst Substances 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明は、再生ポリエチレン系樹脂を含むフィルムに関する。 The present invention relates to a film containing a recycled polyethylene resin.
樹脂製の包装袋は、食品、医薬品、肥料、樹脂ペレット等の包装材として広範な用途に利用されている。中でも、ヒートシール性を有する包装袋では、袋状構造の形成（製袋）や内容物の袋内への封入にヒートシールを利用することができ、製袋や包装袋への内容物の封入における作業性に優れている。有機肥料、穀類、樹脂ペレット等の重量物の包装袋の材料としては、ヒートシール性と強度を得るという観点から、ポリエチレン系樹脂からなるフィルムが用いられている。 Resin packaging bags are widely used as packaging materials for foods, pharmaceuticals, fertilizers, resin pellets and the like. Among them, in a packaging bag having heat-sealing property, heat-sealing can be used for forming a bag-like structure (bag making) and enclosing the contents in the bag, and enclosing the contents in the bag-making or packaging bag. Excellent workability in. As a material for packaging bags for heavy objects such as organic fertilizers, grains, and resin pellets, a film made of polyethylene resin is used from the viewpoint of obtaining heat sealability and strength.
一方、いわゆるレジ袋等の樹脂製の買物袋や各種商品の樹脂製の包装袋については、使用後に廃棄された場合に廃棄物としての処理に多大なコストがかかる場合がある。更に、適切な廃棄処理がなされずに投棄された廃棄物が海洋プラスチックごみとして環境汚染を生じさせている場合がある。特に、一袋当たり３ｋｇを超える単位で包装される重量物用のポリエチレン系樹脂フィルムを含む包装袋は、耐水性及び高強度を有し、その廃棄物は海洋ブラスチックごみの発生源となり得るものであり、環境負荷が高い。 On the other hand, resin shopping bags such as so-called plastic shopping bags and resin packaging bags for various products may require a great deal of cost to be treated as waste when they are discarded after use. Furthermore, waste that is dumped without proper disposal may cause environmental pollution as marine plastic waste. In particular, packaging bags containing polyethylene-based resin films for heavy objects, which are packaged in units of more than 3 kg per bag, have water resistance and high strength, and the waste can be a source of marine plastic waste. And the environmental load is high.
特許文献１には、ポリオレフィン系再生樹脂（リサイクル樹脂）からなる単層フィルムにおいてはその成形加工性やフィルム品質の低下が避けられず、また、ポリオレフィン系再生樹脂を未使用のバージン樹脂を混合したブレンド物を原料としたフィルムでは、ポリオレフィン系再生樹脂の割合を高めるには限界があるとの再生樹脂原料に関する課題が開示されている。かかる課題を解決する方法として、特許文献１には、ポリオレフィン系再生樹脂（リサイクル樹脂）からなるＡ層と、メタロセン触媒を用いて製造された特定の物性を有するエチレン・炭素数３〜１８のα−オレフィン共重合体からなるＢ層とを積層してなる再生樹脂積層フィルムが開示されている。特許文献１では、かかる構成の多層フィルムとすることによって、再生ポリオレフィン系樹脂を使用しても、そのバージン樹脂を用いたものよりも格段に優れたフィルム品質を持った積層フィルムを提供できるとされている。 Patent Document 1 states that in a single-layer film made of a polyolefin-based recycled resin (recycled resin), deterioration in moldability and film quality is unavoidable, and an unused polyolefin-based recycled resin is mixed with an unused virgin resin. It is disclosed that there is a limit to increasing the proportion of polyolefin-based recycled resin in a film made from a blended product, which is a problem regarding a recycled resin raw material. As a method for solving such a problem, Patent Document 1 describes an α having a specific physical property of ethylene having 3 to 18 carbon atoms, which is produced by using a layer A made of a polyolefin-based recycled resin (recycled resin) and a metallocene catalyst. A recycled resin laminated film formed by laminating a B layer made of an olefin copolymer is disclosed. According to Patent Document 1, by using a multilayer film having such a structure, it is possible to provide a laminated film having significantly superior film quality even when a recycled polyolefin resin is used, as compared with a film using the virgin resin. ing.
フィルムの樹脂成分として再生ポリエチレン系樹脂が、包装袋等の包装材を製造するための成形加工性や包装材の構成材料としての強度を満たすことができれば、使用後の廃棄物からの再利用率の向上を図ることができる。その結果、廃棄プラスチックごみ量の削減を通して、プラスチックごみの処理にかかる費用の低減や、プラスチックごみによる環境汚染の抑制に役立つものと考えられる。
本発明の目的は、包装材等の構成部材としての成形加工性や強度を満たすことができる再生ポリエチレン系樹脂フィルムを提供することにある。
If recycled polyethylene resin as a resin component of the film can satisfy the molding processability for manufacturing packaging materials such as packaging bags and the strength as a constituent material of packaging materials, the reuse rate from waste after use Can be improved. As a result, it is considered that the reduction of the amount of waste plastic waste will help reduce the cost of processing the plastic waste and reduce the environmental pollution caused by the plastic waste.
An object of the present invention is to provide a recycled polyethylene-based resin film capable of satisfying molding processability and strength as a constituent member of a packaging material or the like.
本発明者らは、特定の物性を有する再生ポリエチレン系樹脂を選択して帯電防止剤と組み合わせて調製した樹脂組成物を用いて形成されたフィルムは、樹脂成分として再生ポリエチレン系樹脂のみを含む場合でも、包装材用等としての成形加工性や強度を有するとの新たな知見を得た。本発明はかかる本発明者らの新たな知見に基づいてなされたものである。 When the film formed by using a resin composition prepared by selecting a regenerated polyethylene-based resin having specific physical properties and combining it with an antistatic agent contains only the regenerated polyethylene-based resin as a resin component. However, we have obtained new findings that it has molding processability and strength for packaging materials and the like. The present invention has been made based on the new findings of the present inventors.
本発明は、以下の事項により特定される。
［１］ メルトフローレート（ＭＦＲ、１９０℃、２．１６ｋｇ荷重）が０．１〜５．０ｇ／１０ｍｉｎ、密度が９００〜９４９ｋｇ／ｍ３の再生ポリエチレン系樹脂と、帯電防止剤を含む樹脂組成物を含むフィルム。
［２］ フィルム厚みが３１〜３００μｍである、［１］に記載のフィルム。
［３］ 帯電防止剤を３質量%未満含む、［１］または［２］に記載のフィルム。
［４］ 再生ポリエチレン系樹脂が、エチレンと炭素原子数３以上のα−オレフィンの共重合体を含む、請求項［１］〜［４］のいずれか一項に記載のフィルム。
The present invention is specified by the following matters.
[1] A resin composition containing a recycled polyethylene resin having a melt flow rate (MFR, 190 ° C., 2.16 kg load) of 0.1 to 5.0 g / 10 min and a density of 900 to 949 kg / m 3 and an antistatic agent. A film containing things.
[2] The film according to [1], wherein the film thickness is 31 to 300 μm.
[3] The film according to [1] or [2], which contains less than 3% by mass of an antistatic agent.
[4] The film according to any one of claims [1] to [4], wherein the recycled polyethylene-based resin contains a copolymer of ethylene and an α-olefin having 3 or more carbon atoms.
本発明によれば、樹脂成分として再生樹脂にみを用いた場合でも、包装材等の用途における成形加工性や強度を有するフィルムを提供することができる。 According to the present invention, it is possible to provide a film having molding processability and strength in applications such as packaging materials even when only recycled resin is used as a resin component.
本発明にかかるフィルムは、メルトフローレート（ＭＦＲ、１９０℃、２．１６ｋｇ荷重）が０．１〜５．０ｇ／１０ｍｉｎ、密度が９００〜９４９ｋｇ／ｍ３の再生ポリエチレン系樹脂と、帯電防止剤を含む。 The film according to the present invention comprises a recycled polyethylene resin having a melt flow rate (MFR, 190 ° C., 2.16 kg load) of 0.1 to 5.0 g / 10 min and a density of 900 to 949 kg / m 3 , and an antistatic agent. including.
再生ポリエチレン系樹脂としては、ポリエチレン系樹脂からなる各種製品の製造において発生した不良品や、使用済みで廃棄されるポリエチレン系樹脂からなる各種製品から公知の方法で再生された再生ポリエチレン系樹脂を用いることができる。ポリエチレン系樹脂の再生方法については特に限定されない。このような再生ポリエチレン系樹脂としては、低密度ポリエチレン（ＬＤＰＥ）、リニア低密度ポリエチレン（ＬＬＤＰＥ）、高密度ポリエチレン（ＨＤＰＥ）等を挙げることができる。これらの再生ポリエチレン系樹脂の１種、あるいは２種以上のブレンドから、上記のＭＦＲ及び密度を満たすものを選択して用いる。 As the recycled polyethylene resin, a defective product generated in the manufacture of various products made of polyethylene resin or a recycled polyethylene resin regenerated by a known method from various products made of used polyethylene resin is used. be able to. The method for regenerating the polyethylene resin is not particularly limited. Examples of such recycled polyethylene-based resin include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and high-density polyethylene (HDPE). From one or a blend of two or more of these regenerated polyethylene resins, those satisfying the above MFR and density are selected and used.
好ましい再生ポリエチレン系樹脂としては、エチレンと炭素原子数３以上、好ましくは炭素原子数３〜２０のα−オレフィンの共重合体（エチレン・α−オレフィン共重合体）を挙げることができる。エチレン・α−オレフィン共重合体におけるα−オレフィンの具体例としては、プロピレン、ブテン、１−オクテン、１−ヘキセンが挙げられる。中でも、１−ヘキセン、１−オクテンが好ましく、１−ヘキセンがより好ましい。 Preferred regenerated polyethylene-based resin includes a copolymer of ethylene and an α-olefin having 3 or more carbon atoms, preferably 3 to 20 carbon atoms (ethylene / α-olefin copolymer). Specific examples of the α-olefin in the ethylene / α-olefin copolymer include propylene, butene, 1-octene, and 1-hexene. Among them, 1-hexene and 1-octene are preferable, and 1-hexene is more preferable.
再生ポリエチレン系樹脂のＭＦＲは、上記のとおり、０．１〜５．０ｇ／１０ｍｉｎであり、好ましくは０．３〜４ｇ／１０ｍｉｎである。
また、再生ポリエチレン系樹脂の密度は、上記のとおり、９００〜９４９ｋｇ／ｍ３であり、好ましくは９０５〜９４５ｋｇ／ｍ３である。
上記の範囲のＭＦＲ及び密度を有する再生ポリエチレン系樹脂を樹脂成分として、帯電防止剤とともにフィルム成形用材料として用いることで、包装材用等としての成形加工性や強度を得ることができる。
As described above, the MFR of the regenerated polyethylene resin is 0.1 to 5.0 g / 10 min, preferably 0.3 to 4 g / 10 min.
The density of the recycled polyethylene resin, as described above, a 900~949kg / m 3, preferably 905~945kg / m 3.
By using a recycled polyethylene resin having an MFR and density in the above range as a resin component and as a film molding material together with an antistatic agent, molding processability and strength for packaging materials and the like can be obtained.
帯電防止剤のフィルム中への配合割合は、発明の効果を得られるように設定すればよく、特に限定されない。フィルムに目的とする物性を付与する上で、フィルム全体に対して３質量％未満であることが好ましく、２．５質量％以下であることがより好ましい。また、その下限値に関しては、フィルム全体に対して０．０００１質量％以上であることが好ましい。 The mixing ratio of the antistatic agent in the film may be set so as to obtain the effect of the invention, and is not particularly limited. In order to impart the desired physical properties to the film, it is preferably less than 3% by mass, more preferably 2.5% by mass or less with respect to the entire film. The lower limit is preferably 0.0001% by mass or more with respect to the entire film.
再生ポリエチレン系樹脂には、帯電防止剤以外の添加剤を必要に応じて添加してもよい。添加剤の具体例としては、アンチブロッキング剤、防曇剤、酸化防止剤、耐候安定剤、熱安定剤、滑剤等が挙げられる。 Additives other than the antistatic agent may be added to the regenerated polyethylene resin as needed. Specific examples of the additive include an anti-blocking agent, an anti-fog agent, an antioxidant, a weather-resistant stabilizer, a heat stabilizer, a lubricant and the like.
本発明にかかるフィルムは、再生ポリエチレン系樹脂と帯電防止剤を含む樹脂組成物を成形用原料として用いた種々のフィルム成形方法を用いて製造することができる。フィルム成形方法としては、インフレーション成形法、Ｔダイ成形法等の押出成形法等を挙げることができる。 The film according to the present invention can be produced by using various film molding methods using a resin composition containing a recycled polyethylene resin and an antistatic agent as a molding raw material. Examples of the film molding method include an inflation molding method, an extrusion molding method such as a T-die molding method, and the like.
本発明にかかるフィルムの厚さは、用途に応じて設定すればよく限定されない。重量物用の包装袋等の包装材等の用途においては、フィルム厚を３１μｍ〜３００μｍの範囲とすることが好ましい。 The thickness of the film according to the present invention may be set according to the intended use and is not limited. In applications such as packaging materials such as packaging bags for heavy objects, the film thickness is preferably in the range of 31 μm to 300 μm.
以下、実施例により本発明をさらに詳細に説明する。ただし、本発明はこれらの実施例に限定されない。 Hereinafter, the present invention will be described in more detail with reference to Examples. However, the present invention is not limited to these examples.
比較例１では樹脂成分として以下の銘柄名の樹脂（バージン樹脂材料）を用いた。
・ＳＰ４００５：エチレン・α−オレフィン共重合体［プライムポリマー社製、エボリューＨ（登録商標）、ＭＦＲ（１９０℃、２．１６ｋｇ）＝０．４３ｇ／１０分、密度＝９４０．５ｋｇ／ｍ３］
・ＳＰ２５１０：エチレン・１−ヘキセン共重合体［プライムポリマー社製、エボリュー（登録商標）ＭＦＲ（１９０℃、２．１６ｋｇ）＝１．５ｇ／１０分、密度＝９２３ｋｇ／ｍ３］
実施例１では樹脂成分として上記のバージン樹脂材料のブレンドから得られる再生樹脂を用いた。
In Comparative Example 1, a resin (virgin resin material) having the following brand name was used as the resin component.
-SP4005: Ethylene / α-olefin copolymer [Prime Polymer Co., Ltd., Evolu H (registered trademark), MFR (190 ° C., 2.16 kg) = 0.43 g / 10 minutes, density = 940.5 kg / m 3 ]
SP2510: Ethylene 1-hexene copolymer [Prime Polymer Co., Ltd., Evolu (registered trademark) MFR (190 ° C, 2.16 kg) = 1.5 g / 10 minutes, density = 923 kg / m 3 ]
In Example 1, a recycled resin obtained from the above blend of virgin resin materials was used as the resin component.
樹脂成分のＭＦＲ及び密度は以下の方法により測定した。
＜メルトフローレート（ＭＦＲ）＞
樹脂成分のメルトフローレート（ＭＦＲ）は、ＪＩＳ Ｋ７２１０−１に準拠し、１９０℃、２．１６ｋｇ荷重の条件下で測定した。
The MFR and density of the resin component were measured by the following methods.
<Melt flow rate (MFR)>
The melt flow rate (MFR) of the resin component was measured in accordance with JIS K7210-1 under the conditions of 190 ° C. and a load of 2.16 kg.
＜密度＞
樹脂成分の密度は、ＪＩＳ Ｋ７１１２に準拠し、ＭＦＲ測定時に得られるストランドを１００℃で１時間熱処理し、更に室温で１時間放置した後に密度勾配管法で測定した。
<Density>
The density of the resin component was measured by the density gradient tube method after heat-treating the strand obtained at the time of MFR measurement at 100 ° C. for 1 hour and further leaving it at room temperature for 1 hour in accordance with JIS K7112.
実施例１及び比較例１
ＳＰ４００５とＳＰ２５１０を半々でブレンドした樹脂材料の再生品を樹脂成分として用意し、樹脂成分（ＰＥ樹脂）１００質量％に対して電防止剤マスターバッチを１．３質量％（帯電防止剤：９７５ｐｐｍ）ブレンドして実施例１用の再生ポリエチレン系樹脂組成物（ポリエチレン再生品）を得た。
バージ樹脂材料としてのＳＰ４００５とＳＰ２５１０を半々でブレンドした樹脂材料の再生品を樹脂成分として用意し、樹脂成分（ＰＥ樹脂）１００質量％に対して電防止剤マスターバッチを１．３質量％（帯電防止剤：９７５ｐｐｍ）ブレンドして比較例１用のバージンポリエチレン系樹脂組成物（ポリエチレンバージン品）を得た。各樹脂成分のＭＦＲ、バージンポリエチレン系樹脂組成物の密度、再生ポリエチレン樹脂密度の値を表１に示す。
Example 1 and Comparative Example 1
A recycled product of a resin material in which SP4005 and SP2510 are blended in half and half is prepared as a resin component, and 1.3% by mass of an antistatic agent masterbatch is added to 100% by mass of the resin component (PE resin) (antistatic agent: 975 ppm). The mixture was blended to obtain a recycled polyethylene resin composition (recycled polyethylene product) for Example 1.
A recycled product of a resin material in which SP4005 and SP2510 as barge resin materials are blended in half and half is prepared as a resin component, and 1.3% by mass (charged) of an antistatic agent master batch is added to 100% by mass of the resin component (PE resin). Inhibitor: 975 ppm) was blended to obtain a virgin polyethylene-based resin composition (polyethylene virgin product) for Comparative Example 1. Table 1 shows the values of the MFR of each resin component, the density of the virgin polyethylene resin composition, and the density of the recycled polyethylene resin.
次に、上記のようにして得た２種のポリエチレン系樹脂組成物をそれぞれ個々に用いて、下記成形条件で空冷インフレーション成形を行い、肉厚４０μｍ、折り幅３２０ｍｍのフィルムを製造した。
＜フィルム成形条件＞
成形機：モダンマシナリー製５０ｍｍφインフレーション成形機
スクリュー：バリアタイプスクリュー
ダイス：１００ｍｍφ（径）、２．５ｍｍ（リップ幅）
エアーリング：２ギャップタイプ
成形温度：２００℃
押出し量：２８．８ｋｇ／ｈ
引取速度：２０ｍ／ｍｉｎ
Next, each of the two polyethylene-based resin compositions obtained as described above was individually used for air-cooled inflation molding under the following molding conditions to produce a film having a wall thickness of 40 μm and a folding width of 320 mm.
<Film molding conditions>
Molding machine: 50mmφ inflation molding machine made by Modern Machinery Screw: Barrier type screw die: 100mmφ (diameter), 2.5mm (lip width)
Air ring: 2-gap type Molding temperature: 200 ° C
Extruded amount: 28.8 kg / h
Pick-up speed: 20m / min
得られた各フィルムについて以下のフィルム物性の測定を行った。各フィルムの厚さ、密度、引張弾性率及びダートインパクト強度の測定結果を表１に示す。更に、以下の基準による各フィルムの環境対応に関する評価結果を表１に示す。
＜環境対応に関する評価＞
〇：廃棄樹脂削減効果が高い
×：廃棄樹脂削減効果が無い
The following film physical characteristics were measured for each of the obtained films. Table 1 shows the measurement results of the thickness, density, tensile modulus and dirt impact strength of each film. Furthermore, Table 1 shows the evaluation results regarding the environmental friendliness of each film based on the following criteria.
<Evaluation of environmental measures>
〇: High effect of reducing waste resin ×: No effect of reducing waste resin
＜引張弾性率＞
フィルムからＪＩＳ Ｋ６７８１に準ずる大きさのダンベルを打ち抜き試験片とし、フィルムの引取方向と平行に打ち抜く場合をＭＤ（縦方向）、フィルムの引取方向と直角に打ち抜く場合をＴＤ（横方向）とする。万能材料試験機のエアチャックに試験片をセットし、チャック間距離８０ｍｍ、引張速度２００ｍｍ／分で引張試験を行い、初期応力の変位に対する傾きを引張弾性率とする。
<Tension modulus>
A dumbbell having a size equivalent to JIS K6781 is used as a punching test piece from the film, and the case of punching parallel to the film picking direction is defined as MD (vertical direction), and the case of punching perpendicular to the film picking direction is defined as TD (horizontal direction). A test piece is set on an air chuck of a universal material testing machine, a tensile test is performed at a distance between chucks of 80 mm and a tensile speed of 200 mm / min, and the inclination of the initial stress with respect to displacement is defined as the tensile elastic modulus.
＜ダートインパクト強度＞
ダートインパクトは、ＡＳＴＭ Ｄ１７０９に従って、以下の条件にて測定した。
試験片（４０μｍ厚）をエアークランプ方式で締め付け、半球形のダートを一定の高さから落下させ、試験片が５０％破壊する荷重［ｇ］をグラフから読み取る。一水準の落下回数は１０回として、Ａ法を用いる。
<Dirt impact strength>
Dirt impact was measured according to ASTM D1709 under the following conditions.
The test piece (40 μm thickness) is tightened by an air clamp method, a hemispherical dirt is dropped from a certain height, and the load [g] at which the test piece breaks by 50% is read from the graph. Method A is used with the number of drops per level being 10 times.
表１に示すとおり、ポリエチレン再生品とポリエチレンバージン品において、同等の引張強度及びダートインパクト強度が得られており、ポリエチレン再生品は単層フィルムとしてた場合でも、重量物用包装袋等の包装材用として利用し得るものであった。従って、このポリエチレン再生品は、環境対応の観点から、包装材等からのポリエチレン系樹脂フィルム廃棄物の削減効果を有する。 As shown in Table 1, the recycled polyethylene product and the polyethylene virgin product have the same tensile strength and dirt impact strength, and the recycled polyethylene product is a packaging material such as a packaging bag for heavy objects even when it is used as a single-layer film. It could be used for use. Therefore, this recycled polyethylene product has an effect of reducing polyethylene-based resin film waste from packaging materials and the like from the viewpoint of environmental friendliness.
本発明にかかる再生ポリエチレン系樹脂フィルムは、包装材等からのポリエチレン系樹脂フィルム廃棄物の削減に効果を有する。 The recycled polyethylene-based resin film according to the present invention is effective in reducing polyethylene-based resin film waste from packaging materials and the like.
Claims (4)
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| WO2024070157A1 (en) * | 2022-09-30 | 2024-04-04 | 大王製紙株式会社 | Sanitary article package manufacturing method and sanitary article package |
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