JP2691282B2 - Package with excellent openability - Google Patents

Package with excellent openability

Info

Publication number
JP2691282B2
JP2691282B2 JP20258988A JP20258988A JP2691282B2 JP 2691282 B2 JP2691282 B2 JP 2691282B2 JP 20258988 A JP20258988 A JP 20258988A JP 20258988 A JP20258988 A JP 20258988A JP 2691282 B2 JP2691282 B2 JP 2691282B2
Authority
JP
Japan
Prior art keywords
synthetic resin
package
packaging material
resin film
adhesive
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 - Fee Related
Application number
JP20258988A
Other languages
Japanese (ja)
Other versions
JPH0257561A (en
Inventor
充幸 和佐本
賢一 角脇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Foil Manufacturing Co Ltd
Original Assignee
Nippon Foil Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Foil Manufacturing Co Ltd filed Critical Nippon Foil Manufacturing Co Ltd
Priority to JP20258988A priority Critical patent/JP2691282B2/en
Publication of JPH0257561A publication Critical patent/JPH0257561A/en
Application granted granted Critical
Publication of JP2691282B2 publication Critical patent/JP2691282B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Packages (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【産業上の利用分野】 本発明は、パウチ等と呼ばれる包装体に関するもので
あり、手指で包装材料を引き裂いて開封するのに適した
包装体に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package called a pouch or the like, and more particularly to a package suitable for tearing and opening a packaging material with fingers.

【従来の技術】[Prior art]

従来より、合成樹脂製フィルム又はこれとアルミニウ
ム箔とを接着剤で接合した積層物等の包装材料を袋状に
した、パウチ等と呼ばれる包装体が用いられている。こ
の包装体は、合成樹脂製フィルムの周囲を熱融着等によ
り接着することによって、密封されている。従って、こ
の包装体を開封するには、包装材料の所定の箇所を鋏で
切除したり、又は手指で引き裂いて切除したりして行っ
ている。 しかし、鋏で切除する場合はともとかく、手指で引き
裂いて開封する場合には、開封が良好に行えないという
ことがあった。即ち、開封部分がずれて、包装材料の所
定の箇所を切除できないということがあった。このた
め、開封口がいたずらに大きくなったり、又は開封時に
内容物が溢れるということもあった。 このようなことから、一軸延伸をした合成樹脂製フィ
ルム、例えば一軸延伸ポリプロピレンフィルム,一軸延
伸高密度ポリエチレンフィルム,一軸延伸ポリアミドフ
ィルム等が包装材料として用いられている。この包装材
料を用いると、手指で引き裂いた場合、延伸方向に沿っ
て引き裂かれ、包装材料の所定の箇所を切除でき、良好
に開封することができる。 しかしながら、この一軸延伸合成樹脂製フィルムは、
結晶領域が比較的多いためその融点が高くなり、包装体
作成時の生産性が低下するということがあった。即ち、
合成樹脂製フィルムの周囲を熱融着して包装体を作成す
るわけであるが、合成樹脂製フィルムの融点が高くなる
と、低温融着性が低下するからである。 これを回避するため、引き裂き性に優れた一軸延伸合
成樹脂製フィルムと、低温融着性に優れた無延伸合成樹
脂製フィルム、例えば無延伸ポリオレフィン系フィルム
等とをポリウレタン系接着剤等で接合したもの、又はこ
れの一軸延伸合成樹脂製フィルムの他面にアルミニウム
箔等の金属箔をポリウレタン系接着剤で接合したもの等
が包装材料として用いられている。しかし、これらの包
装材料を用いた包装体は、開封部を手指で引き裂くと、
主として無延伸合成樹脂製フィルムがフェザリングを起
こし、良好に開封することができないということがあっ
た。
BACKGROUND ART Conventionally, a packaging body called a pouch or the like is used, which is a bag-shaped packaging material such as a synthetic resin film or a laminate in which the synthetic resin film and an aluminum foil are bonded with an adhesive. This package is hermetically sealed by bonding the periphery of a synthetic resin film by heat fusion or the like. Therefore, the package is opened by cutting a predetermined portion of the packaging material with scissors or tearing and cutting with a finger. However, there was a case where the opening could not be performed satisfactorily in the case of tearing with a finger and opening, regardless of the case of cutting with scissors. That is, there are cases in which the unsealed portion is displaced and it is not possible to cut out a predetermined portion of the packaging material. For this reason, the opening may be unnecessarily large, or the contents may overflow during opening. For this reason, uniaxially stretched synthetic resin films such as uniaxially stretched polypropylene film, uniaxially stretched high density polyethylene film, and uniaxially stretched polyamide film are used as packaging materials. When this packaging material is used, when it is torn with fingers, it is torn along the stretching direction, a predetermined part of the packaging material can be cut off, and it can be opened satisfactorily. However, this uniaxially stretched synthetic resin film,
Since the crystal region is relatively large, the melting point thereof becomes high, which sometimes lowers the productivity at the time of producing the package. That is,
This is because the periphery of the synthetic resin film is heat-sealed to form a package, but when the melting point of the synthetic resin film is high, the low temperature fusion property is deteriorated. In order to avoid this, a film made of uniaxially stretched synthetic resin excellent in tearability and a film made of unstretched synthetic resin excellent in low-temperature fusion property, for example, an unstretched polyolefin-based film, etc. were joined with a polyurethane adhesive or the like. As a packaging material, a material, or a material obtained by bonding a metal foil such as an aluminum foil to the other surface of the uniaxially stretched synthetic resin film with a polyurethane adhesive is used as a packaging material. However, the package using these packaging materials, when tearing the opening part with fingers,
There have been cases in which the unstretched synthetic resin film mainly causes feathering and cannot be opened satisfactorily.

【発明が解決しようとする課題】[Problems to be solved by the invention]

本発明者等がフェザリングの原因を検討したところ、
包装材料を手指で引き裂く際に、一軸延伸した合成樹脂
製フィルムと無延伸合成樹脂製フィルム及び/又はアル
ミニウム箔との界面が剥離し、包装材料が一定の方向へ
引き裂かれないためであることが判明した。また、フェ
ザリングを生じさせながら無理に引き裂いて開封する場
合、大きな力が要ることが判明した。 そこで、本発明者等は包装材料の剥離強度を大きくす
る等、種々検討した結果、開封部分のみの剥離強度を大
きくし、非開封部分の剥離強度は開封部分の剥離強度よ
りも小さくすることによって、良好に開封しうることを
見出し、本発明に到ったのである。
When the inventors examined the cause of feathering,
This is because when tearing the packaging material with fingers, the interface between the uniaxially stretched synthetic resin film and the unstretched synthetic resin film and / or the aluminum foil peels off, and the packaging material does not tear in a certain direction. found. It has also been found that a great deal of force is required when tearing by force while tearing to open. Therefore, the present inventors have made various examinations such as increasing the peeling strength of the packaging material. As a result, the peeling strength of only the unsealed portion is increased, and the peeling strength of the unopened portion is made smaller than the peeling strength of the unsealed portion. Therefore, they have found that they can be opened satisfactorily, and arrived at the present invention.

【課題を解決するための手段】[Means for Solving the Problems]

即ち本発明は、手指で包装材料を引き裂いて開封しう
る袋状の包装体であって、前記包装材料は金属箔と合成
樹脂製フィルムとを接着剤で接合した三層積層物を少な
くとも具備しており、前記三層積層物の開封部分におけ
る前記金属箔と前記合成樹脂製フィルムとの剥離強度
が、非開封部分における前記金属箔と前記合成樹脂製フ
ィルムとの剥離強度より大きいことを特徴とする開封性
に優れた包装体に関するものである。 以下、図面に基づき本発明を説明する。 本発明に係る包装体(1)は袋状である。袋状の包装
体(1)を作成するには、例えば図面に示す如く二枚の
包装材料(3),(3)を重合して、その全周囲を熱融
着によって接着してもよいし、また一枚の包装材料
(3)を二つ折りにして、その三辺の周囲を熱融着によ
って接着してもよい。 包装材料(3)は、金属箔と合成樹脂製フィルムとを
接着剤で接合した三層構造物を少なくとも具備してい
る。この包装材料(3)を用いて包装体(1)を作成す
る場合、合成樹脂製フィルム面を内面として用いる。従
って、包装体(1)の周囲を熱融着する場合には、この
合成樹脂製フィルムを軟化若しくは溶融させることによ
って行う。 包装材料(3)に用いられる金属箔としては、アルミ
ニウム箔,鉄箔,銅箔等が用いられるが、アルミニウム
箔を用いるのが一般的である。また合成樹脂製フィルム
としては、ポリエチレンフィルム,ポリプロピレンフィ
ルム等が用いられるが、引き裂き方向性のない無延伸ポ
リプロピレンフィルムが一般的に用いられる。特に三層
積層物としては、アルミニウム箔と無延伸ポリプロピレ
ンフィルムとを酸変性ポリプロピレン系接着剤で接合し
たものを用いるのが好ましい。ここで酸変性ポリプロピ
レンとは、ポリプロピレンの側鎖にジカルボン酸を付加
したものであり、一般的にはポリプロピレンの側鎖にマ
レイン酸を付加させたものが用いられる。具体的には、
市販品である三井石油化学工業(株)製ユニストールR1
00,R120,R200又は東洋インキ製造(株)製リオフレック
ス3000,4000等が用いられる。 本発明においては、三層積層物をそのまま包装材料
(3)としてもよいし、また三層積層物に更に他のフィ
ルム等を積層してもよい。例えば、金属箔の上面に、表
面又は裏面に文字や図柄等が印刷された二軸延伸ポリエ
ステルフィルムや二軸延伸ポリアミドフィルム等をポリ
ウレタン系接着剤で、接合してもよい。 この三層積層物の開封部分(2a)における、金属箔と
合成樹脂製フィルムとの剥離強度は、非開封部分(2b)
における金属箔と合成樹脂製フィルムとの剥離強度より
も大きい。剥離強度に差を設けるには、開封部分(2a)
における金属箔と合成樹脂製フィルムとを接着力の大き
い接着剤で接合し、非開封部分(2b)における金属箔と
合成樹脂製フィルムとを接着力の小さい接着剤で接合す
ればよい。また、接着剤として感熱接着剤の酸変性ポリ
プロピレン系接着剤を使用した場合には、一旦低温度
(例えば150℃程度)で金属箔と合成樹脂製フィルムと
を加圧して接合し、その後開封部分(2a)のみを高温度
(例えば200℃程度)で再加圧して接合すればよい。開
封部分(2a)のみの再加圧は、包装体(1)を作成した
後でもよいし、包装体(1)の作成前であってもよい。 本発明における包装体(1)において、開封部分(2
a)は第1図に示す如く、左端から右端に上端と平行に
亙ってもよいし、第3図に示す如く左端から上端へ斜行
して亙ってもよい。なお、開封部分(2a)を明確にする
ために、開封部分(2a)の両端にノッチ(4)を設けて
おくのが好ましい。
That is, the present invention is a bag-shaped package which can be opened by tearing the packaging material with fingers, wherein the packaging material comprises at least a three-layer laminate in which a metal foil and a synthetic resin film are bonded with an adhesive. The peel strength between the metal foil and the synthetic resin film in the open portion of the three-layer laminate is greater than the peel strength between the metal foil and the synthetic resin film in the non-open portion. The present invention relates to a package having excellent openability. The present invention will be described below with reference to the drawings. The package (1) according to the present invention has a bag shape. In order to prepare the bag-shaped package (1), for example, two packaging materials (3) and (3) may be polymerized and the entire periphery thereof may be adhered by heat fusion as shown in the drawing. Alternatively, one piece of packaging material (3) may be folded in two and the three sides thereof may be adhered by heat fusion. The packaging material (3) includes at least a three-layer structure in which a metal foil and a synthetic resin film are bonded with an adhesive. When the packaging body (1) is prepared using this packaging material (3), the synthetic resin film surface is used as the inner surface. Therefore, when the periphery of the package (1) is heat-sealed, the synthetic resin film is softened or melted. As the metal foil used for the packaging material (3), aluminum foil, iron foil, copper foil and the like are used, but aluminum foil is generally used. As the synthetic resin film, a polyethylene film, a polypropylene film or the like is used, but an unstretched polypropylene film having no tear direction is generally used. In particular, as the three-layer laminate, it is preferable to use an aluminum foil and an unstretched polypropylene film bonded with an acid-modified polypropylene adhesive. Here, the acid-modified polypropylene is one in which a dicarboxylic acid is added to the side chain of polypropylene, and generally, one in which maleic acid is added to the side chain of polypropylene is used. In particular,
Unistor R1 manufactured by Mitsui Petrochemical Industry Co., Ltd.
00, R120, R200 or Riofrex 3000, 4000 manufactured by Toyo Ink Mfg. Co., Ltd. is used. In the present invention, the three-layer laminate may be used as it is as the packaging material (3), or another film or the like may be laminated on the three-layer laminate. For example, a biaxially stretched polyester film or a biaxially stretched polyamide film having characters or patterns printed on the front surface or the back surface may be bonded to the upper surface of the metal foil with a polyurethane adhesive. The peel strength between the metal foil and the synthetic resin film in the unsealed part (2a) of this three-layer laminate is
Is larger than the peel strength between the metal foil and the synthetic resin film. To make a difference in peel strength, open part (2a)
The metal foil and the synthetic resin film in 3) may be joined with an adhesive having a large adhesive force, and the metal foil and the synthetic resin film in the unopened portion (2b) may be joined with an adhesive having a small adhesive force. When an acid-modified polypropylene-based adhesive which is a heat-sensitive adhesive is used as the adhesive, the metal foil and the synthetic resin film are once pressure-bonded at a low temperature (for example, about 150 ° C.), and then the unsealed portion. Only (2a) needs to be repressurized at a high temperature (for example, about 200 ° C.) to join. The repressurization of only the unsealed portion (2a) may be performed after the packaging body (1) is created or before the packaging body (1) is created. In the package (1) of the present invention, the unsealed part (2
As shown in FIG. 1, a) may extend parallel to the upper end from the left end to the right end, or may obliquely extend from the left end to the upper end as shown in FIG. In addition, in order to clarify the unsealed portion (2a), it is preferable to provide notches (4) at both ends of the unsealed portion (2a).

【実施例】【Example】

厚さ10μのアルミニウム箔の表面に酸変性ポリプロピ
レン系接着剤(三井石油化学工業(株)製、商品名ユニ
ストールR100;固形分15重量%)を20g/m2塗布し、乾燥
させた後、接着剤面に厚さ70μの無延伸ポリプロピレン
フィルム(東レ合成フィルム(株)製、商品名ZK93)を
積層し、その後温度150℃、圧力1kg/cm2、時間1秒間の
条件で、無延伸ポリプロピレンフィルムとアルミニウム
箔とを接合して、積層物を得た。その後、積層物の一定
の帯状区域を開封部分とみなし、温度200℃、圧力1kg/c
m2、時間1秒間の条件で再加圧して、三層積層物を得
た。 再加圧した部分の剥離強度と、再加圧しなかった部分
の剥離強度を測定したところ、前者は1.7kg/15mm巾であ
り、後者は0.8kg/15mm巾であった。 前記の三層積層物のアルミニウム箔面に、厚さ12μの
二軸延伸ポリエステルフィルム(東洋紡績(株)製、商
品名エスペット)をポリウレタン系接着剤で接合して、
包装材料を得た。 この包装材料を用いて、三層積層物を再加圧した部分
と、再加圧しなかった部分から、大きさ40mm×60mmの短
冊片を、それぞれ二枚づつ取り出した。同種の短冊片を
二枚重ねて、短辺の中央にノッチを入れて、短辺の左片
と右片とをそれぞれ引張試験機のチャックで把持して、
二枚の短冊片を同時に引張速度は200mm/minで引き裂い
た。 引き裂きが始まる時から、完全に引き裂きが完了する
迄の引張荷重をチャートに記録し、全引張荷重の量を計
算(チャートに記録された線で囲まれた面積を求めるこ
とによって計算)したところ、再加圧した部分は約600k
g・mmであったのに対し、再加圧しなかった部分は約100
0kg・mmであった。また、再加圧した部分はフェザリン
グが生じることなく、綺麗に引き裂けたのに対し、再加
圧しなかった部分はフェザリングが生じた。 更に、前記の包装材料の再加圧した部分を手指で引き
裂いていったところ、再加圧した部分のみが良好に引き
裂かれ、再加圧していない部分に引き裂きが移行すると
いうことはなかった。これは、再加圧した部分を引き裂
くエネルギー消費量が、再加圧していない部分を引き裂
くエネルギーの消費量よりも少ないからである。 従って、再加圧して剥離強度が大きくなった部分は、
再加圧せずに剥離強度の小さい部分よりも、引き裂き性
に優れていることが分かる。
20 g / m 2 of acid-modified polypropylene adhesive (Mitsui Petrochemical Industry Co., Ltd., trade name Unistall R100; solid content 15% by weight) is applied on the surface of an aluminum foil having a thickness of 10 μm, and after drying, A 70μ thick unstretched polypropylene film (trade name: ZK93, manufactured by Toray Synthetic Films Co., Ltd.) is laminated on the adhesive surface, and then unstretched polypropylene under the conditions of a temperature of 150 ° C., a pressure of 1 kg / cm 2 , and a time of 1 second. The film and aluminum foil were joined to obtain a laminate. After that, a certain band-shaped area of the laminate is regarded as the unsealed part, and the temperature is 200 ° C and the pressure is 1 kg / c.
Re-pressurization was performed under the condition of m 2 for 1 second to obtain a three-layer laminate. The peel strength of the repressurized portion and the peel strength of the non-repressed portion were measured, and the former was 1.7 kg / 15 mm width and the latter was 0.8 kg / 15 mm width. A biaxially stretched polyester film having a thickness of 12 μ (manufactured by Toyobo Co., Ltd., trade name Espet) is bonded to the aluminum foil surface of the above three-layer laminate with a polyurethane adhesive,
The packaging material was obtained. Using this packaging material, two strips each having a size of 40 mm × 60 mm were taken out from the part where the three-layer laminate was re-pressed and the part where it was not re-pressed. Stack two strips of the same type, put a notch in the center of the short side, grasp the left side and right side of the short side with the chuck of the tensile tester, respectively,
Two strips were simultaneously torn at a pulling speed of 200 mm / min. The tensile load from the time when the tear started to the time when the tear was completely completed was recorded on the chart, and the amount of the total tensile load was calculated (calculated by calculating the area surrounded by the line recorded on the chart). Re-pressurized part is about 600k
It was gmm, but the part that was not repressurized was about 100
It was 0 kg · mm. Feathering did not occur in the re-pressurized portion, and tears were finely made, whereas feathering occurred in the non-repressed portion. Furthermore, when the re-pressurized portion of the packaging material was torn with fingers, only the re-pressurized portion was torn well, and the tear did not transfer to the non-re-pressed portion. This is because the energy consumption for tearing the re-pressurized portion is smaller than the energy consumption for tearing the non-re-pressurized portion. Therefore, the part where the peeling strength is increased by repressurization is
It can be seen that the tearing property is superior to that of the part having a small peel strength without re-pressing.

【発明の効果】【The invention's effect】

本発明に係る包装体に用いられている包装材料は、金
属箔と合成樹脂製フィルムとを接着剤で接合した三層積
層物を少なくとも具備しており、この三層積層物の開封
部分における剥離強度は、非開封部分における剥離強度
よりも大きいため、実施例によって実証したように、引
き裂き性に優れている。従って、この三層積層物を包装
材料の構成要素として用い、剥離強度の大きい部分を開
封部分とし、剥離強度の小さい部分を非開封部分とした
包装体は、開封部分を手指で引き裂くことによって、良
好に開封することができる。即ち、開封時にフェザリン
グが生じることを防止でき、更に非開封部分に引き裂き
が移行するのを防止できるのである。従って、包装材料
の開封部分を手指で引き裂く場合において、開封口が大
きくなったり、また開封する際に内容物が溢れるという
ことを防止しうるという効果を奏する。
The packaging material used in the packaging body according to the present invention comprises at least a three-layer laminate obtained by joining a metal foil and a synthetic resin film with an adhesive, and peeling off the three-layer laminate at the opening portion. Since the strength is higher than the peel strength in the unopened portion, the tearability is excellent as demonstrated by the examples. Therefore, using the three-layer laminate as a component of a packaging material, a portion having a large peel strength as an opening portion, a portion having a small peel strength as a non-opening portion, by tearing the opening portion with fingers, It can be opened well. That is, it is possible to prevent feathering from occurring at the time of opening, and further to prevent the tear from transferring to the non-opening portion. Therefore, when tearing the opening portion of the packaging material with fingers, it is possible to prevent the opening opening from becoming large and the contents from being overflowed at the time of opening.

【図面の簡単な説明】[Brief description of the drawings]

第1図は本発明の一例に係る包装体の平面図であり、第
2図はこの包装体の中央縦断面図である。また、第3図
は本発明の他例に係る包装体の平面図である。 (1)……包装体,(2a)……開封部分,(2b)……非
開封部分,(3)……包装材料,
FIG. 1 is a plan view of a package according to an example of the present invention, and FIG. 2 is a central longitudinal sectional view of this package. FIG. 3 is a plan view of a package according to another example of the present invention. (1) …… Package, (2a) …… Opened part, (2b) …… Unopened part, (3) …… Packaging material,

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】手指で包装材料を引き裂いて開封しうる袋
状の包装体であって、前記包装材料は金属箔と合成樹脂
製フィルムとを接着剤で接合した三層積層物を少なくと
も具備しており、前記三層積層物の開封部分における前
記金属箔と前記合成樹脂製フィルムとの剥離強度が、非
開封部分における前記金属箔と前記合成樹脂製フィルム
との剥離強度より大きいことを特徴とする開封性に優れ
た包装体。
1. A bag-shaped package which can be opened by tearing the packaging material with fingers, the packaging material comprising at least a three-layer laminate in which a metal foil and a synthetic resin film are bonded with an adhesive. The peel strength between the metal foil and the synthetic resin film in the open portion of the three-layer laminate is greater than the peel strength between the metal foil and the synthetic resin film in the non-open portion. A package with excellent openability.
【請求項2】三層積層物として、アルミニウム箔と無延
伸ポリプロピレンフィルムとを酸変性ポリプロピレン系
接着剤で接合したものを用いる請求項(1)記載の開封
性に優れた包装体。
2. The package having excellent openability according to claim 1, wherein an aluminum foil and a non-stretched polypropylene film bonded with an acid-modified polypropylene adhesive are used as the three-layer laminate.
JP20258988A 1988-08-12 1988-08-12 Package with excellent openability Expired - Fee Related JP2691282B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20258988A JP2691282B2 (en) 1988-08-12 1988-08-12 Package with excellent openability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20258988A JP2691282B2 (en) 1988-08-12 1988-08-12 Package with excellent openability

Publications (2)

Publication Number Publication Date
JPH0257561A JPH0257561A (en) 1990-02-27
JP2691282B2 true JP2691282B2 (en) 1997-12-17

Family

ID=16459986

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20258988A Expired - Fee Related JP2691282B2 (en) 1988-08-12 1988-08-12 Package with excellent openability

Country Status (1)

Country Link
JP (1) JP2691282B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5964607A (en) * 1982-10-06 1984-04-12 Nissan Chem Ind Ltd Production of vinyl chloride resin
JP2503842Y2 (en) * 1989-12-18 1996-07-03 藤森工業株式会社 Easy-open packaging bag
KR20000028193A (en) * 1998-10-30 2000-05-25 장영소 Wrapping container of disposable gargle
JP3785989B2 (en) * 2001-11-06 2006-06-14 東洋製罐株式会社 Easy-open packaging bag

Also Published As

Publication number Publication date
JPH0257561A (en) 1990-02-27

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