JPH0419261B2 - - Google Patents
Info
- Publication number
- JPH0419261B2 JPH0419261B2 JP16667186A JP16667186A JPH0419261B2 JP H0419261 B2 JPH0419261 B2 JP H0419261B2 JP 16667186 A JP16667186 A JP 16667186A JP 16667186 A JP16667186 A JP 16667186A JP H0419261 B2 JPH0419261 B2 JP H0419261B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- styrene
- sealing
- sealing material
- resin
- 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
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 3
- 229920006226 ethylene-acrylic acid Polymers 0.000 claims description 3
- 239000012775 heat-sealing material Substances 0.000 claims description 3
- 239000011342 resin composition Substances 0.000 claims description 3
- 229920001890 Novodur Polymers 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims 1
- 238000007789 sealing Methods 0.000 description 12
- 239000003566 sealing material Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- -1 acrylic ester Chemical class 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920005990 polystyrene resin Polymers 0.000 description 2
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 235000013527 bean curd Nutrition 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 235000011962 puddings Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Description
（産業上の利用分野）
本発明はヒートシール用のフイルムに関し、特
に、スチレン系樹脂製の容器をヒートシールする
際にシール材として用いられるフイルム製造方法
に関する。
（従来の技術）
スチレン系樹脂で造られた容器（以下スチレン
容器と称する）はシールパツクとして、近年乳製
品、菓子、豆腐等の食品包装用に広く利用されて
きている。そして、それら容器のシール用材とし
ては、専らホツトメルト接着剤又は溶剤型接着剤
をコーテイングしたアルミニウム箔が使用されて
いるが、シール材の剥離後に容器側に残る接着剤
が食品衛生上の点から問題となつており、アルミ
ニウム箔に代るシール材が望まれている。
（発明が解決しようとする問題点）
この点に関し、本出願人は既に、スチレン−ブ
タジエンブロツク共重合体を含むシール材を用い
てスチレン容器をヒートシールする方法について
提案した（特公昭52−46150号公報）。この方法に
依る時は、従来易開封性を有するシール温度条件
巾が極めて狭いとされていたスチレン容器のシー
ル温度条件巾を広くすることが可能となつたが、
この場合でも実用的には未だ充分満足するものと
はいえない。
本発明者等は、更にシール温度条件巾を広く採
ることの出来るシール材に就き研究を行い実用的
にも充分満足し得るシール材として以下に説明す
るフイルムの製造方法を見出し、本発明を完成す
るに至つた。
（問題点を解決するための手段）
すなわち本発明は、エチレン−アクリル酸エス
テル共重合体(A)５〜50wt％及びスチレン含量60
〜95wt％のスチレン−ブタジエンブロツク共重
合体(B)95〜50wt％の樹脂組成物からなるスチレ
ン系樹脂製容器用ヒートシール材フイルムの製造
方法である。
次に本発明のエチレン−アクリル酸エステル共
重合体(A)（以下(A)成分と略す）とスチレン含量60
〜95wt％のスチレン−ブタジエンブロツク共重
合体(B)（以下(B)成分という）から成るフイルムに
あつては、(A)成分は５〜50wt％の範囲で存在す
る。5wt％未満では易開封性のシール温度条件巾
が狭くなり、50wt％を越えると粘着性が増大し、
ブロツキングを起すと同時に、シール強度自体が
低下する。使用するアクリル酸エステルとして
は、エチルアクリレートが代表的なものとして挙
げられるが、その他のエステルも同様に使用する
ことができる。(A)成分中のアクリル酸エステルの
含有量は５〜35wt％の範囲のものがフイルム強
度の点で好適である。
この樹脂組成物から成るヒートシール材フイル
ムを用いて、スチレン容器をシールする時は、従
来のシール材を用いる場合に比べ更に易開封性を
有するシール温度条件巾を広く採ることが可能と
なる。
ヒートシールの方法としては通常のヒートシー
ラーの形状、方法で良く、更にインパルスシーラ
ー等による方法が用いられる。
ヒートシールの対象となるスチレン容器の材質
としては一般用ポリスチレン樹脂、ゴム変性ポリ
スチレン樹脂、AS樹脂、ABS樹脂等のスチレン
系樹脂が使用される。
本発明に係るフイルムは、又他のフイルム或は
は、アルミニウム箔と積層して、或いはアルミニ
ウムを蒸着して使用することも可能である。
（実施例）
以下更に本発明を、実施例を以つて詳説する。
実施例
表に示す組成範囲で各成分を混合し、インフレ
ーシヨン法により100μｍ厚のフイルムを成形し、
そのフイルムのシール性、製膜性及びフイルム物
性を測定した。尚シール性は、耐衝撃性スチロー
ル樹脂製容器を用いて測定した。各測定は、次の
基準で判定された。
(1) シール性
耐衝撃性スチロール樹脂製のプリン容器に、
表中の組成物より得られたフイルムをヒートシ
ールし、易開封性を有するシール温度条件巾が
20℃以上の場合を○とし、20℃に満たない場合
を×とした。尚易開封性とは通常の状態で密閉
しており、蓋を剥離する際に、蓋又は容器が破
損しないで、手で容易に開封することのできる
性質を意味する。
(2) 製膜性
インフレーシヨン法によりフイルム化できる
ものを○とし、ブロツキング等でフイルム化で
きないものを×とした。
(3) フイルム物性
シール容器よりシールフイルムを剥離する
時、フイルムが破損するものを×とし、破損す
ることなく開封されるものを○とした。
(Industrial Application Field) The present invention relates to a film for heat sealing, and more particularly to a method for manufacturing a film used as a sealing material when heat sealing containers made of styrene resin. (Prior Art) Containers made of styrene resin (hereinafter referred to as styrene containers) have been widely used as seal packs in recent years for packaging foods such as dairy products, confectionery, and tofu. Aluminum foil coated with hot melt adhesive or solvent-based adhesive is used exclusively as sealing material for these containers, but the adhesive remaining on the container side after the sealing material is peeled off poses a problem from a food hygiene perspective. Therefore, a sealing material that can replace aluminum foil is desired. (Problems to be Solved by the Invention) Regarding this point, the applicant has already proposed a method of heat sealing styrene containers using a sealing material containing a styrene-butadiene block copolymer (Japanese Patent Publication No. 52-46150). Publication No.). When using this method, it became possible to widen the sealing temperature range of styrene containers, which was previously thought to have an extremely narrow sealing temperature range, but
Even in this case, it still cannot be said to be fully satisfactory in practical terms. The inventors of the present invention further conducted research into sealing materials that can accommodate a wide range of sealing temperature conditions, and discovered a method for manufacturing the film described below as a sealing material that is fully satisfactory from a practical standpoint, and completed the present invention. I came to the conclusion. (Means for Solving the Problems) That is, the present invention provides an ethylene-acrylic acid ester copolymer (A) with a content of 5 to 50 wt% and a styrene content of 60%.
This is a method for producing a heat sealing material film for containers made of styrenic resin, comprising a resin composition containing 95 to 50 wt% of styrene-butadiene block copolymer (B) of 95 to 95 wt%. Next, the ethylene-acrylic acid ester copolymer (A) of the present invention (hereinafter abbreviated as component (A)) and the styrene content 60
In a film consisting of ~95 wt% of styrene-butadiene block copolymer (B) (hereinafter referred to as component (B)), component (A) is present in the range of 5 to 50 wt%. If it is less than 5wt%, the seal temperature range for easy opening becomes narrower, and if it exceeds 50wt%, the tackiness increases.
At the same time as blocking occurs, the seal strength itself decreases. Ethyl acrylate is a typical example of the acrylic ester used, but other esters can be used as well. The content of acrylic ester in component (A) is preferably in the range of 5 to 35 wt% from the viewpoint of film strength. When sealing a styrene container using a heat sealing material film made of this resin composition, it becomes possible to adopt a wider range of sealing temperature conditions with easier opening than when using a conventional sealing material. As for the heat sealing method, a conventional heat sealer shape and method may be used, and a method using an impulse sealer or the like may be used. Styrene resins such as general polystyrene resin, rubber-modified polystyrene resin, AS resin, and ABS resin are used as the material for the styrene container to be heat-sealed. The film according to the present invention can also be used by being laminated with other films or aluminum foil, or by vapor-depositing aluminum. (Examples) Hereinafter, the present invention will be further explained in detail with reference to Examples. Example Each component was mixed within the composition range shown in the table, and a film with a thickness of 100 μm was formed by the inflation method.
The sealing properties, film forming properties, and physical properties of the film were measured. The sealability was measured using a container made of impact-resistant styrene resin. Each measurement was judged based on the following criteria. (1) Sealing performance A pudding container made of impact-resistant styrene resin,
The film obtained from the composition in the table is heat-sealed, and the sealing temperature condition range for easy opening is determined.
When the temperature was 20°C or higher, it was marked as ○, and when the temperature was less than 20°C, it was marked as ×. Easy-to-open property means that the container is sealed in a normal state and can be easily opened by hand without damaging the lid or the container when the lid is peeled off. (2) Film-forming properties Those that can be made into a film by the inflation method are marked as ○, and those that cannot be made into a film due to blocking or the like are marked as ×. (3) Physical properties of the film When the seal film was peeled off from the sealed container, the seal film was marked as "×" if the film was damaged, and the film was marked as "○" if the film could be opened without being damaged.
【表】【table】
【表】
（発明の効果）
以上のとおり本発明のフイルムは、ヒートシー
ル性にすぐれ、しかも再開封時の剥離も容易にで
きるため、容器の破損をまねかない特徴を有して
いる。[Table] (Effects of the Invention) As described above, the film of the present invention has excellent heat-sealability and can be easily peeled off when resealing, so it has the characteristic of not causing damage to the container.
Claims (1)
〜50wt％及びスチレン含量60〜95wt％のスチレ
ン−ブタジエンブロツク共重合体(B)95〜50wt％
の樹脂組成物を押出成形することを特徴とするス
チレン系樹脂製容器用ヒートシール材フイルムの
製造方法。1 Ethylene-acrylic acid ester copolymer (A) 5
~50wt% and styrene-butadiene block copolymer (B) 95-50wt% with styrene content 60-95wt%
1. A method for producing a heat sealing material film for styrenic resin containers, the method comprising extrusion molding a resin composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16667186A JPS6211761A (en) | 1986-07-17 | 1986-07-17 | Film for heat sealing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16667186A JPS6211761A (en) | 1986-07-17 | 1986-07-17 | Film for heat sealing |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3193478A Division JPS54141872A (en) | 1978-03-20 | 1978-03-20 | Heat sealing film, and sealing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6211761A JPS6211761A (en) | 1987-01-20 |
| JPH0419261B2 true JPH0419261B2 (en) | 1992-03-30 |
Family
ID=15835566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16667186A Granted JPS6211761A (en) | 1986-07-17 | 1986-07-17 | Film for heat sealing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6211761A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2682666B1 (en) * | 1991-10-18 | 1994-01-21 | Atochem | THERMOSCELLABLE AND PEELABLE FILM FOR POLYSTYRENE CONTAINERS AND SEALING METHOD USING THE SAME. |
| US6682825B1 (en) | 1994-06-06 | 2004-01-27 | Cryovac, Inc. | Films having enhanced sealing characteristics and packages containing same |
| CN110042923B (en) * | 2019-05-27 | 2020-06-02 | 江苏工程职业技术学院 | Manufacturing process of double-layer air film structure building |
-
1986
- 1986-07-17 JP JP16667186A patent/JPS6211761A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6211761A (en) | 1987-01-20 |
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