JPH0312685Y2 - - Google Patents
Info
- Publication number
- JPH0312685Y2 JPH0312685Y2 JP14887284U JP14887284U JPH0312685Y2 JP H0312685 Y2 JPH0312685 Y2 JP H0312685Y2 JP 14887284 U JP14887284 U JP 14887284U JP 14887284 U JP14887284 U JP 14887284U JP H0312685 Y2 JPH0312685 Y2 JP H0312685Y2
- Authority
- JP
- Japan
- Prior art keywords
- ethylene
- packaging material
- thermoplastic resin
- heat
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000005022 packaging material Substances 0.000 claims description 20
- 229920005992 thermoplastic resin Polymers 0.000 claims description 20
- 239000000945 filler Substances 0.000 claims description 17
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 claims description 4
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 229920006226 ethylene-acrylic acid Polymers 0.000 claims description 2
- 229920000554 ionomer Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920005648 ethylene methacrylic acid copolymer Polymers 0.000 claims 1
- 229920000642 polymer Polymers 0.000 claims 1
- 238000007789 sealing Methods 0.000 description 13
- 239000010410 layer Substances 0.000 description 10
- 239000010445 mica Substances 0.000 description 8
- 229910052618 mica group Inorganic materials 0.000 description 8
- 238000001125 extrusion Methods 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 229920001684 low density polyethylene Polymers 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 239000012793 heat-sealing layer Substances 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000004831 Hot glue Substances 0.000 description 1
- 239000004840 adhesive resin Substances 0.000 description 1
- 229920006223 adhesive resin Polymers 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 229920003145 methacrylic acid copolymer Polymers 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012764 mineral filler Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000003348 petrochemical agent Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
Landscapes
- Wrappers (AREA)
Description
〈産業上の利用分野〉
本考案の包装材料は、現在世の中で広く使用さ
れている食品、医療、医薬品、日用品、玩具等の
包装用として使用することができ、易開封性に優
れた包装材料である。
〈従来の技術〉
従来より、包装材料においては、開封の容易さ
は求められており、包装材料のヒートシール層に
易剥離性を付与する方法で、ヒートシール層自体
が開封時凝集破壊し、容易に開封出来るもの、ヒ
ートシールされた界面が完全融着せず、開封時界
面剥離により容易に開封出来るよう、ヒートシー
ル層を改質したもの等がある。これらの多くは、
熱可塑性樹脂に、他の熱可塑性樹脂、粘着樹脂等
を均一に混合してなる熱溶融接着組成物であり、
ヒートシール強度のコントロールを行うのが難し
く、シール圧力の変更によつて対応しているが、
所望のシール強度を簡単に得ることはできなかつ
た。また、一般に、ヒートシールする際の熱量
は、ヒートシーラーの機械的な構造上の理由か
ら、必ずしも安定したものではなく、熱量不足に
よるシール不良や、熱量過多によるシール面の劣
化といつた問題が度々発生している。
〈考案が解決しようとする問題点〉
本考案の目的は、これらの欠点を解消し、開封
性に優れ、かつ、ヒートシール強度を簡単にコン
トロールすることが可能であり、さらには押出し
加工の容易な袋状包装材料を提供することにあ
る。
〈問題点を解決するための手段〉
本考案は、熱可塑性樹脂に薄片状充填材を充填
して成る樹脂層を基材フイルムの表面に設けて成
る開封性に優れた包装材料である。
本考案者らは、熱可塑性樹脂に各種充填材を添
加し、その物性を種々検討したところ、特に薄片
状充填材を添加した熱可塑性樹脂層と少なくとも
一層よりなる基材とを積層した包装材料を使用し
た場合、充填材を未添加の熱可塑性樹脂層また
は、薄片状以外の形状をした無機充填材を添加し
た熱可塑性樹脂層と基材とを積層した包装材料を
使用した場合に比べ、開封性に優れ、かつ、ヒー
トシール強度を簡単コントロールすることが可能
となることを見い出した。
本考案はこの発見に基いてなされたものであ
る。
以下、本考案を図に従い詳細に説明する。第１
図、第２図に示す通り、本考案は、薄片状充填材
を含有する樹脂層１の片面に少なくとも一層から
なる、プラスチツク、金属箔の単体もしくは複合
基材フイルム２をラミネートした積層体３であ
り、また第３図に示す通り印刷等を複合基材フイ
ルム２に施すことも出来る。
本考案で用いる薄片状充填材は熱可塑性樹脂に
添加し、押出し加工した時に熱分解したり、熱可
塑性樹脂に相溶したりせず、薄片状構造を保持し
た状態で樹脂中に分散するものであれば良い。
また、押出し加工された熱可塑性樹脂中での薄
片状充填材の分布は完全に平行ではないが、厚み
方向にほぼ層状に分布しており、その点が本考案
の包装材料を使用して第４図のようにヒートシー
ルした後、剥離する際薄片状充填材の層間で剥離
するものと推定され、優れた開封性を付与する要
因と考えられる。
本考案では薄片状充填材のうち、コスト、入手
の容易さ、耐熱性、などから、マイカ（雲母）、
鱗片状タルク、鱗片状クレー、ガラスフレーク等
が適している。これらは共にケイ酸塩の無機質充
填材であり、アスペクト比（厚さに対する平均直
径の比）が大きい薄片状であり、厚さ0.5μ〜2μ、
平均直径10〜60μ程度の範囲のものが、分散状
態、易剥離性の面から通している。またその添加
量を５〜60重量％の範囲で変化させることによ
り、ヒートシール強度をコントロールすることが
簡単にでき、広い温度域で安定したヒートシール
強度が得られる。すなわち、熱可塑性樹脂中の薄
片状充填材の添加量を、増やしていくに従つてヒ
ートシール強度は低下していき、安定した強度が
得られるが、添加量が60重量％を越えると、押出
し加工が難しくなり、それ以下が好ましい。
本考案で使用する熱可塑性樹脂は、ポリエチレ
ン、ポリプロピレン、エチレン酢酸ビニル共重合
体、エチレン−アクリル酸共重合体、エチレン−
メタクリル酸共重合体、エチレン−アクリル酸共
重合体、エチレン−アクリル酸エステル共重合
体、そしてアイオノマー等の一般に包装材料のヒ
ートシール層として使用する熱可塑性樹脂は全て
使用出来る。本考案によれば、熱可塑性樹脂を適
時選定することにより、ヒートシール温度域、及
び最大ヒートシール強度を選ぶことが可能であ
り、従つて、本考案の包装材料は袋内に充填する
内容物の性質、重量が異つても十分対応でき、さ
らに、熱可塑性樹脂の変更によつて、充填適正の
改良もできる。
以上の通り、本考案によれば、薄片状充填材を
５〜60重量％含有する熱可塑性樹脂層の片面に少
なくとも一層からなる、プラスチツク、金属箔の
単体もしくは複合基材フイルムをラミネートした
積層体を使用することにより、開封性に優れ、容
易にヒートシール強度をコントロール可能であ
り、さらに通常の押出し加工が出来る包装材料が
得られる。
以下実施例により具体的に説明する。
〈実施例 １〉
二軸押出し機により、マイカ（平均厚み1μ、
平均直径20〜30μ）60重量％、低密度ポリエチレ
ン（ミラソン14：三井石油化学(株)製）40重量％の
コンパウンド樹脂を棒状に押出成形した後、切断
してペレツト化した。このコンパウンドと低密度
ポリエチレンを適量均一に混ぜ合わせ、低密度ポ
リエチレン中のマイカの量が5.0重量％、15.0重
量％、30重量％、45重量％、60重量％となるよう
にした。
これらのマイカ充填低密度ポリエチレンをＴダ
イを有した押出し成形装置を用い、アンカー剤処
理された12μのポリエステルフイルム（ルミラ
ー：東レ(株)製）上に50μの厚みで溶融押出しし、
包装材料を得た。当該包装材料を用い袋状に製袋
したところ、表１に示すように易剥離性に優れ、
また、マイカの充填量によりヒートシール強度が
異なり、シール強度のコントロールが可能であつ
た。
〈実施例 ２〉
実施例１と同様の方法で、エチレン酢酸ビニル
共重合体（ミラソン252：三井石油化学(株)製）に
マイカ（平均厚み0.7μ、平均直径30〜40μ）また
は、炭酸カルシウムをそれぞれの量が、5.0重量
％、15.0重量％、30重量％、45重量％、60重量％
となるようにした。
これらのマイカ又は炭酸カルシウム充填エチレ
ン−酢酸ビニル共重合体を実施例１と同様な方法
で押出し成形し、包装材料を得た。当該包装材料
を用い袋状に製袋したところ、表−２に示すよう
なヒートシール強度が得られた。
<Industrial Application Fields> The packaging material of the present invention can be used to package foods, medical care, pharmaceuticals, daily necessities, toys, etc. that are currently widely used in the world, and is a packaging material with excellent ease of opening. It is. <Prior art> Packaging materials have traditionally been required to be easy to open, and a method of imparting easy peelability to the heat-sealing layer of the packaging material is such that the heat-sealing layer itself undergoes cohesive failure upon opening. There are products that can be easily opened, and products that have modified heat-sealed layers so that the heat-sealed interface does not completely fuse and can be easily opened due to interfacial peeling when the product is opened. Many of these are
A hot melt adhesive composition made by uniformly mixing a thermoplastic resin with other thermoplastic resins, adhesive resins, etc.
It is difficult to control the heat sealing strength, and this can be solved by changing the sealing pressure.
It was not possible to easily obtain the desired seal strength. Additionally, in general, the amount of heat used during heat sealing is not necessarily stable due to the mechanical structure of the heat sealer, and problems such as poor sealing due to insufficient heat and deterioration of the sealing surface due to excessive heat may occur. It happens frequently. <Problems to be solved by the invention> The purpose of the invention is to eliminate these drawbacks, provide excellent opening properties, easily control heat-sealing strength, and facilitate extrusion processing. The purpose of the present invention is to provide a bag-like packaging material. <Means for Solving the Problems> The present invention is a packaging material with excellent unsealability, in which a resin layer made of a thermoplastic resin filled with a flaky filler is provided on the surface of a base film. The inventors of the present invention added various fillers to thermoplastic resin and variously investigated its physical properties, and found that a packaging material in which a thermoplastic resin layer containing flaky fillers and a base material consisting of at least one layer was laminated. When using a packaging material in which a thermoplastic resin layer with no filler added or a thermoplastic resin layer with an inorganic filler added in a shape other than a flake shape and a base material are used, We have discovered that it has excellent unsealability and allows easy control of heat-sealing strength. The present invention was made based on this discovery. Hereinafter, the present invention will be explained in detail with reference to the drawings. 1st
As shown in FIGS. 2 and 2, the present invention comprises a laminate 3 in which a single or composite base film 2 of plastic or metal foil is laminated on one side of a resin layer 1 containing a flaky filler. Alternatively, as shown in FIG. 3, printing or the like can be applied to the composite base film 2. The flaky filler used in this invention is added to a thermoplastic resin and does not thermally decompose or be compatible with the thermoplastic resin during extrusion processing, but disperses in the resin while maintaining a flaky structure. That's fine. In addition, the distribution of the flaky filler in the extruded thermoplastic resin is not completely parallel, but is distributed almost in a layered manner in the thickness direction. As shown in Figure 4, it is presumed that the flaky filler separates between the layers when it is peeled off after being heat-sealed, and this is thought to be a factor contributing to the excellent unsealability. In this invention, among the flaky fillers, mica (mica),
Scaly talc, scaly clay, glass flakes, etc. are suitable. Both of these are silicate mineral fillers, and are flaky with a large aspect ratio (ratio of average diameter to thickness), with a thickness of 0.5μ to 2μ,
A material with an average diameter of about 10 to 60 μm is acceptable from the viewpoint of dispersion state and easy peelability. Furthermore, by varying the amount added within the range of 5 to 60% by weight, the heat seal strength can be easily controlled and stable heat seal strength can be obtained over a wide temperature range. In other words, as the amount of flaky filler added to the thermoplastic resin increases, the heat sealing strength decreases and stable strength is obtained, but when the amount added exceeds 60% by weight, extrusion Processing becomes difficult, so less is preferable. The thermoplastic resins used in this invention include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, and ethylene-vinyl acetate copolymer.
All thermoplastic resins commonly used as heat-sealing layers of packaging materials can be used, such as methacrylic acid copolymers, ethylene-acrylic acid copolymers, ethylene-acrylic acid ester copolymers, and ionomers. According to the present invention, by appropriately selecting the thermoplastic resin, it is possible to select the heat-sealing temperature range and the maximum heat-sealing strength. Even if the properties and weight of the resin are different, the filling properties can be improved by changing the thermoplastic resin. As described above, according to the present invention, a laminate is produced in which a single or composite base film of plastic or metal foil is laminated on one side of a thermoplastic resin layer containing 5 to 60% by weight of a flaky filler. By using this, it is possible to obtain a packaging material that has excellent unsealability, allows easy control of heat-sealing strength, and can be subjected to conventional extrusion processing. This will be explained in detail below using examples. <Example 1> Mica (average thickness 1μ,
A compound resin containing 60% by weight (average diameter 20-30μ) and 40% by weight of low-density polyethylene (Mirason 14, manufactured by Mitsui Petrochemicals, Ltd.) was extruded into a rod shape, and then cut into pellets. Appropriate amounts of this compound and low-density polyethylene were uniformly mixed so that the amount of mica in the low-density polyethylene was 5.0% by weight, 15.0% by weight, 30% by weight, 45% by weight, and 60% by weight. These mica-filled low-density polyethylenes were melt-extruded to a thickness of 50 μm onto a 12 μm polyester film treated with an anchoring agent (Lumirror: manufactured by Toray Industries, Inc.) using an extrusion molding device equipped with a T-die.
Got the packaging material. When the packaging material was made into a bag, it had excellent peelability as shown in Table 1.
Furthermore, the heat sealing strength varied depending on the amount of mica filled, making it possible to control the sealing strength. <Example 2> In the same manner as in Example 1, mica (average thickness 0.7μ, average diameter 30-40μ) or calcium carbonate was added to ethylene-vinyl acetate copolymer (Mirason 252: manufactured by Mitsui Petrochemicals Co., Ltd.). The respective amounts are 5.0% by weight, 15.0% by weight, 30% by weight, 45% by weight, 60% by weight
I made it so that These mica or calcium carbonate filled ethylene-vinyl acetate copolymers were extrusion molded in the same manner as in Example 1 to obtain packaging materials. When a bag was made using the packaging material, the heat seal strength shown in Table 2 was obtained.
【表】【table】
【表】【table】
【表】【table】
【表】
の積層フイルム
〈考案の効果〉
以上の結果より、薄片状充填材を添加すること
により、充填材未添加の場合および、他の粒子状
充填材を添加した場合に比べ、ヒートシール温度
が変化してもヒートシール強度が安定しており、
シール強度のコントロールが可能であることが明
らかである。[Table] Laminated film <Effects of the invention> From the above results, by adding a flaky filler, the heat seal temperature is lower than when no filler is added and when other particulate fillers are added. The heat seal strength is stable even if the
It is clear that control of seal strength is possible.
第１図、第２図及び第３図は、本考案により得
られる包装材料の断面図を示し、第４図は、袋状
に製袋した例を示す。
１……薄片状充填材を含有する熱可塑性樹脂、
２……基材フイルム、３……包装材料、４……印
刷インキ層。
FIGS. 1, 2, and 3 show cross-sectional views of the packaging material obtained by the present invention, and FIG. 4 shows an example of the packaging material made into a bag shape. 1...Thermoplastic resin containing flaky filler,
2...Base film, 3...Packaging material, 4...Printing ink layer.
Claims (1)
樹脂層を、基材フイルムの表面に設けて成る開
封性に優れた包装材料。 (2) 熱可塑性樹脂が、ポリエチレン、ポリプロピ
レン、エチレン−酢酸ビニル共重合体、エチレ
ン−アクリル酸共重合体、エチレン−メタクリ
ル酸共重合体、エチレン−アクリル酸共重合
体、エチレン−アクリル酸エステル共重合体、
又はアイオノマーである実用新案登録請求の範
囲第(1)項記載の包装材料。 (3) 薄片状充填材を熱可塑性樹脂中に、５〜60重
量％充填したことを特徴とした実用新案登録請
求の範囲第(1)項又は第(2)項記載の包装材料。[Claims for Utility Model Registration] (1) A packaging material with excellent unsealability, comprising a resin layer formed by filling a thermoplastic resin with a flaky filler on the surface of a base film. (2) The thermoplastic resin is polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer, etc. polymer,
or the packaging material described in claim (1) of the utility model registration claim, which is an ionomer. (3) The packaging material according to claim 1 or 2 of the utility model registration, characterized in that the flaky filler is filled in a thermoplastic resin in an amount of 5 to 60% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14887284U JPH0312685Y2 (en) | 1984-10-01 | 1984-10-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14887284U JPH0312685Y2 (en) | 1984-10-01 | 1984-10-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6162858U JPS6162858U (en) | 1986-04-28 |
| JPH0312685Y2 true JPH0312685Y2 (en) | 1991-03-25 |
Family
ID=30707070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14887284U Expired JPH0312685Y2 (en) | 1984-10-01 | 1984-10-01 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0312685Y2 (en) |
-
1984
- 1984-10-01 JP JP14887284U patent/JPH0312685Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6162858U (en) | 1986-04-28 |
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