JP3059788B2 - Easy-open bag and manufacturing method thereof - Google Patents
Easy-open bag and manufacturing method thereofInfo
- Publication number
- JP3059788B2 JP3059788B2 JP3219383A JP21938391A JP3059788B2 JP 3059788 B2 JP3059788 B2 JP 3059788B2 JP 3219383 A JP3219383 A JP 3219383A JP 21938391 A JP21938391 A JP 21938391A JP 3059788 B2 JP3059788 B2 JP 3059788B2
- Authority
- JP
- Japan
- Prior art keywords
- packaging material
- bag
- easy
- irregularities
- linear
- 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
Links
Landscapes
- Wrappers (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Bag Frames (AREA)
- Packages (AREA)
- Making Paper Articles (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、開封が容易なプラスチ
ックフィルムの袋及びその製造方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic film bag which can be easily opened and a method for producing the same.
【０００２】[0002]
【従来の技術】従来、プラスチックフィルムの袋を手で
容易に開封するために、袋外縁のシール部に切欠ノッチ
を設けておき、このノッチの部分から引き裂いて開封す
る方法が一般的に知られているが、このようなノッチを
設けた袋では開封する場所が限られる欠点がある。そこ
で、任意の場所から開封するために、外縁のシール部と
なる位置に多数の傷を設けたものが提案されている。例
えば、包装材に貫通した細かい複数の切れ目を包装材に
設けておきこの部分をシールして製袋するものや、同様
な切れ目を入れた基材フィルムに熱接着性樹脂フィルム
を積層した包装材により製袋するものがある。2. Description of the Related Art Conventionally, in order to easily open a plastic film bag by hand, a method is generally known in which a notch notch is provided in a seal portion at an outer edge of the bag, and the bag is torn from the notch and opened. However, the bag provided with such a notch has a drawback that the place to be opened is limited. Therefore, in order to open the package from an arbitrary location, a configuration in which a number of flaws are provided at a position to be a seal portion on the outer edge has been proposed. For example, a packaging material in which a plurality of fine cuts penetrating the packaging material are provided in the packaging material, and this portion is sealed to form a bag, or a packaging material in which a heat-adhesive resin film is laminated on a base film having a similar cut. There are products that make bags.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
技術で述べたシール部に切れ目を設けた袋は、開封時に
切れ目を伝って引き裂かれるものであるが、切れ目の形
状や配置によってはうまく引き裂けない場合があるとい
う問題点があった。また、切れ目を形成するカッターの
刃先の形状や配置が複雑でしかもカッターの使用に伴う
刃の損傷が激しいことから、製造コストが高くなるとい
う問題点があった。However, a bag having a cut in the seal portion described in the prior art is torn along the cut when opened, but does not tear well depending on the shape and arrangement of the cut. There was a problem that sometimes. Further, the shape and arrangement of the cutting edge of the cutter forming the cut are complicated, and the blade is severely damaged by the use of the cutter.
【０００４】本発明は、上記のような問題点に鑑みてな
されたものであり、その目的とするところは、確実にか
つ容易に開封でき、しかも、製造の簡単な易開封性袋及
びその製造方法を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an easily-openable bag which can be opened reliably and easily, and which is easy to manufacture. It is to provide a method.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る一つの形態の易開封性袋は、内面に熱
接着性樹脂を積層した包装材からなる袋において、外縁
のシール部に、該外縁と直角な方向の線状の凹凸であっ
て、上下振動する超音波ホーンと直線状のローレットが
刻まれた回転治具の間に包装材を通すことにより連続状
態で形成した凹凸により構成された弱化領域を設けたこ
とを特徴としており、その製造方法は、上下振動する超
音波ホーンと直線状のローレットが刻まれた回転治具の
間に包装材を通すことにより、前記包装材の側縁と直角
な方向の線状の凹凸を前記包装材の両側縁に沿って帯状
に形成した後、該帯状部分を重ね合わせた状態でヒート
シールして製袋することを特徴とするものである。In order to achieve the above object, an easy-open bag according to one aspect of the present invention is a bag made of a packaging material having a heat-adhesive resin laminated on an inner surface thereof. in part, a linear of unevenness of the outer edge and a direction perpendicular
And an ultrasonic horn that vibrates up and down and a straight knurl
Continuous by passing the packaging material between the engraved rotating jigs
State is characterized in that a weakened area constituted by the formed irregularities in, its manufacturing method will be vertical vibration ultrasonic
A rotary jig with a sonic horn and a straight knurl
After passing the packaging material in between, after forming linear irregularities in a direction perpendicular to the side edge of the packaging material in a band along both side edges of the packaging material, heat is applied in a state where the band-shaped portions are overlapped. It is characterized by making a bag by sealing.
【０００６】また、同様の目的を達成するために、本発
明に係る別の形態の易開封性袋は、内面に熱接着性樹脂
を積層した包装材からなる袋において、外縁の折曲げ部
に、該外縁と直角な方向の線状の凹凸であって、上下振
動する超音波ホーンと直線状のローレットが刻まれた回
転治具の間に包装材を通すことにより連続状態で形成し
た凹凸により構成された弱化領域を設けたことを特徴と
しており、その製造方法は、上下振動する超音波ホーン
と直線状のローレットが刻まれた回転治具の間に包装材
を通すことにより、前記包装材を折り曲げる方向と直角
な方向の線状の凹凸を前記包装材の折曲げ部を覆うよう
にして帯状に形成した後、該帯状部分を折り曲げた状態
で製袋することを特徴とするものである。In order to achieve the same object, another easy-open bag according to the present invention is a bag made of a packaging material having a heat-adhesive resin laminated on the inner surface thereof. , Linear irregularities in a direction perpendicular to the outer edge,
Time with engraved ultrasonic horn and linear knurl
Formed in a continuous state by passing the packaging material between the rolling jigs
It is characterized by providing a weakened area composed of irregularities , and its manufacturing method is an ultrasonic horn that vibrates up and down.
Packaging material between the rotating jig and the straight knurl
After passing through, a linear unevenness in a direction perpendicular to the direction in which the packaging material is bent is formed in a band shape so as to cover the bent portion of the packaging material, and then the bag is formed in a state where the band portion is bent. It is characterized by the following.
【０００７】[0007]
【作用】上記構成からなる各易開封性袋においては、そ
のシール部或いは折曲げ部に対して手で引き裂く力が掛
かると、シール部或いは折曲げ部における弱化領域は線
状の凹凸に沿って容易に切断され、そのまま引き裂くこ
とにより袋全体が開封される。In each of the easily-openable bags having the above-mentioned structure, when a tearing force is applied to the seal portion or the bent portion by hand, the weakened area in the seal portion or the bent portion follows the linear irregularities. The bag is easily cut and teared to open the entire bag.
【０００８】[0008]
【実施例】図１は本発明に係る一つの形態の易開封性袋
の一実施例を示す平面図である。この易開封性袋１は、
外側から順にナイロンフィルム（１５μ）、アルミ箔
（７〜９μ）、ポリエチレンフィルム（２０〜４０μ）
が積層されてなる包装材で形成されたもので、その周囲
にシール部ａ、ｂ、ｃを有するいわゆる三方シール袋の
形態をしており、縦方向のシール部ａには外縁と直角な
方向の線状の凹凸で構成された弱化領域２を有してい
る。FIG. 1 is a plan view showing an embodiment of an easy-open bag according to one embodiment of the present invention. This easy-open bag 1
Nylon film (15μ), aluminum foil (7-9μ), polyethylene film (20-40μ) from outside
Is formed of a packaging material in which is laminated, and is in the form of a so-called three-side seal bag having seal portions a, b, and c around the seal material, and the vertical seal portion a has a direction perpendicular to the outer edge. Has a weakened area 2 composed of linear irregularities.
【０００９】上記の易開封性袋１は次の工程で作成され
る。まず、従来より普通に使用されている超音波ウェル
ダーを使用し、図２に示すように、上下振動する超音波
ホーン３と直線状のローレット目が刻まれた回転治具４
の間に包装材５を通すことにより、包装材５の両側に沿
ってホーン３と回転治具４のクリアランス分の凹凸６を
形成する。すなわち、ホーン３と回転治具４のクリアラ
ンスを包装材５の厚みの半分程度としておき、ホーン３
の超音波振動により包装材５の樹脂部分を溶解させると
同時に加圧して凹凸状に変形させる。このようにして図
３に示す如く包装材５の両側に側縁と直角な方向の線状
の凹凸６からなる帯状部分７，７を予め形成しておく。
次いで、包装材５を通常の自動製袋機にかけ、両側の帯
状部分７，７を重ね合わせた状態で縦方向のシール部ａ
をヒートシールし、下方のシール部ｂをヒートシールし
てから内容物を充填し、上方のシール部ｃをヒートシー
ルして図１の如く製袋する。この場合、帯状部分７はヒ
ートシール時に加熱押圧されるが、凹凸６は完全には潰
されずに残った状態となり、この凹凸６により縦方向の
シール部ａには弱化領域２が形成される。The easy-open bag 1 is prepared in the following steps. First, using an ultrasonic welder conventionally used conventionally, as shown in FIG. 2, an ultrasonic horn 3 vibrating up and down and a rotary jig 4 having a straight knurl are cut.
By passing the packaging material 5 therebetween, irregularities 6 corresponding to the clearance between the horn 3 and the rotary jig 4 are formed along both sides of the packaging material 5. That is, the clearance between the horn 3 and the rotary jig 4 is set to about half the thickness of the packaging material 5 and the horn 3
The resin portion of the wrapping material 5 is melted by the ultrasonic vibration, and is simultaneously deformed into an uneven shape by applying pressure. In this way, as shown in FIG. 3, the band-shaped portions 7, 7 composed of linear irregularities 6 in the direction perpendicular to the side edges are formed on both sides of the packaging material 5 in advance.
Next, the packaging material 5 is set on a normal automatic bag making machine, and the vertical sealing portions a
Is heat-sealed, the lower seal portion b is heat-sealed, the contents are filled, and the upper seal portion c is heat-sealed to form a bag as shown in FIG. In this case, the belt-like portion 7 is heated and pressed during heat sealing, but the unevenness 6 remains without being completely crushed, and the unevenness 6 forms the weakened region 2 in the vertical seal portion a.
【００１０】上述のようにして形成された易開封性袋１
は、開封に際して弱化領域２の任意の箇所で引き裂くよ
うにされる。そして、弱化領域２に引き裂く力が掛かる
と、シール部ａは凹凸６に沿って容易に切断され、その
まま引き裂くことにより袋全体が開封される。[0010] Easy-open bag 1 formed as described above
Is torn at any point in the weakened area 2 upon opening. Then, when a tearing force is applied to the weakened area 2, the seal portion a is easily cut along the irregularities 6, and the entire bag is opened by tearing as it is.
【００１１】なお、上記の実施例では三方シール袋のシ
ール部に弱化領域を設ける例を示したが、このような弱
化領域は外縁にシール部を有する任意の形態の袋に設け
ることができる。In the above embodiment, an example is shown in which a weakened region is provided in the seal portion of the three-side seal bag. However, such a weakened region can be provided in any type of bag having a seal portion on the outer edge.
【００１２】図４は本発明に係る他の形態の易開封性袋
の一実施例を示す平面図である。この易開封性袋１１
は、先の実施例と同じ包装材で形成されたもので、背部
分に合掌貼りのシール部ｄと上下にシール部ｅ，ｆを有
するいわゆる合掌貼り袋の形態をしており、両側の折曲
げ部αには折り曲げる方向と直角な方向の線状の凹凸で
構成された弱化領域１２を有している。FIG. 4 is a plan view showing an embodiment of another easy-open bag according to the present invention. This easy-open bag 11
Is made of the same wrapping material as in the previous embodiment, and is in the form of a so-called gas-stick bag having a seal portion d on the back and seal portions e and f on the upper and lower sides. The bent portion α has a weakened region 12 composed of linear irregularities in a direction perpendicular to the bending direction.
【００１３】上記の易開封性袋１１は次の工程で作成さ
れる。まず、図２に示すのと同様な超音波ホーン３と回
転治具４の間に包装材を通すことにより、図５に示す如
く包装材１５の幅の略１／４のところに包装材１５を折
り曲げる方向と直角な方向の線状の凹凸からなる帯状部
分１７を２列に形成する。次いで、包装材１５を自動製
袋機にかけ、背部分のシール部ｄを合掌貼りでヒートシ
ールした後、帯状部分１７をその幅の略中央で折り曲げ
た状態とし、下方のシール部ｆをヒートシールして内容
物を充填してから上方のシール部ｅをヒートシールして
図４の如く製袋する。このようにして、両側の折曲げ部
αには外縁と直角な方向の凹凸からなる弱化領域１２が
形成される。The easy-open bag 11 is prepared in the following steps. First, by passing the packaging material between the ultrasonic horn 3 and the rotary jig 4 similar to that shown in FIG. 2, the packaging material 15 is placed at approximately ４ of the width of the packaging material 15 as shown in FIG. Are formed in two rows, each of which is formed of linear irregularities in a direction perpendicular to the direction in which is bent. Next, the packaging material 15 is placed on an automatic bag making machine, and the back seal part d is heat-sealed by affixing the palms thereof. After filling the contents, the upper seal portion e is heat-sealed to form a bag as shown in FIG. In this manner, the weakened regions 12 formed of the irregularities in the direction perpendicular to the outer edge are formed at the bent portions α on both sides.
【００１４】上述のようにして形成された易開封性袋１
１は、開封に際して手で弱化領域１２の任意の箇所が引
き裂くようにされる。そして、弱化領域１２に引き裂く
力が掛かると、折曲げ部αは凹凸に沿って容易に切断さ
れ、そのまま引き裂くことにより袋全体が開封される。An easily openable bag 1 formed as described above.
1 is such that any part of the weakened area 12 is torn by hand when opened. Then, when a tearing force is applied to the weakened region 12, the bent portion α is easily cut along the unevenness, and the entire bag is opened by tearing as it is.
【００１５】なお、上記実施例では、袋１１の両側の折
曲げ部αにそれぞれ弱化領域１２を設けるようにした
が、片側だけでもよいことはもちろんである。また、上
記の実施例では合掌貼り袋の折曲げ部に弱化領域を設け
る例を示したが、このような弱化領域は外縁に折曲げ部
を有する任意の形態の袋に設けることができる。In the above embodiment, the weakened areas 12 are provided at the bent portions α on both sides of the bag 11, however, it goes without saying that only one side may be provided. Further, in the above-described embodiment, an example is described in which the weakened region is provided at the bent portion of the bag attached to the palm. However, such a weakened region can be provided in any type of bag having a bent portion at the outer edge.
【００１６】また、使用する包装材としては、上記の各
実施例で説明したものに限るものではなく、内面に熱接
着性樹脂を積層したものであれば、内容物に応じて適宜
のものを使用してもよい。さらに、延伸フィルムを積層
して引き裂きに方向性を持たせるようにすることもでき
る。The packaging material to be used is not limited to those described in each of the above embodiments, but may be any suitable material depending on the contents as long as a heat-adhesive resin is laminated on the inner surface. May be used. Further, a stretched film can be laminated to give directionality to tearing.
【００１７】[0017]
【発明の効果】本願発明は、上述のとおり構成されてい
るので次に記載する効果を奏する。Since the present invention is configured as described above, it has the following effects.
【００１８】外縁のシール部或いは折曲げ部に、前記外
縁と直角な方向の線状の凹凸であって、上下振動する超
音波ホーンと直線状のローレットが刻まれた回転治具の
間に包装材を通すことにより連続状態で形成した凹凸に
より構成された弱化領域を設けたことにより、凹凸の部
分がノッチと同様な作用を行いしかも凹凸に沿って真っ
直ぐに引き裂けることから、任意の箇所から確実にかつ
容易に袋を開封することができる。[0018] the seal portion or the bent portion of the outer edge, said an edge direction perpendicular linear of irregularities, ultra vertically vibrating
A rotary jig with a sonic horn and a straight knurl
Unevenness formed in a continuous state by passing packaging material between
By providing a more structured weakened regions, since the portion of the uneven tear straight along the performed yet uneven the same operation and the notch, to open reliably and easily bag from any location Can be.
【００１９】本発明の易開封性袋は、包装材に予め凹凸
を帯状に形成しておき、この帯状部分をシールするか或
いは折り曲げることにより製袋するが、この凹凸は通常
の超音波ウェルダーを使用して形成することができるの
で袋の製造が簡単であり、しかもコストを低く押さえる
ことができる。In the easy-open bag of the present invention, irregularities are previously formed in a band shape on the packaging material, and the band-shaped portion is sealed or folded to form a bag. Since it can be formed by using, the production of the bag is simple, and the cost can be kept low.
【図１】本発明に係る一つの形態の易開封性袋の一実施
例を示す平面図である。FIG. 1 is a plan view showing one embodiment of an easy-open bag according to one embodiment of the present invention.
【図２】包装材に線状の凹凸を形成する方法の説明図で
ある。FIG. 2 is an explanatory diagram of a method of forming linear irregularities on a packaging material.
【図３】線状の凹凸が帯状に形成された包装材の一形態
を示す概略図である。FIG. 3 is a schematic view showing one embodiment of a packaging material in which linear irregularities are formed in a belt shape.
【図４】本発明に係る他の形態の易開封性袋の一実施例
を示す平面図である。FIG. 4 is a plan view showing an embodiment of another easily-openable bag according to the present invention.
【図５】線状の凹凸が帯状に形成された包装材の他の形
態を示す概略図である。FIG. 5 is a schematic view showing another embodiment of a packaging material in which linear irregularities are formed in a belt shape.
１ 易開封性袋 ２ 弱化領域 ５ 包装材 ６ 凹凸 ａ シール部 １１ 易開封性袋 １２ 弱化領域 １５ 包装材 α 折曲げ部 DESCRIPTION OF SYMBOLS 1 Easy-open bag 2 Weakened area 5 Packaging material 6 Irregularities a Seal part 11 Easy-opened bag 12 Weak area 15 Packaging material α Folded part
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｂ６５Ｄ 65/28 Ｂ６５Ｄ 65/28 (58)調査した分野(Int.Cl.7，ＤＢ名) B65D 33/00 B65D 65/28 B65D 77/30 B31B 1/25 321 B31B 41/14 - 41/24 B29C 59/00 - 59/04 ──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. 7 identification code FI B65D 65/28 B65D 65/28 (58) Field surveyed (Int.Cl. 7 , DB name) B65D 33/00 B65D 65/28 B65D 77/30 B31B 1/25 321 B31B 41/14-41/24 B29C 59/00-59/04
Claims (4)
らなる袋において、外縁のシール部に、該外縁と直角な
方向の線状の凹凸であって、上下振動する超音波ホーン
と直線状のローレットが刻まれた回転治具の間に包装材
を通すことにより連続状態で形成した凹凸により構成さ
れた弱化領域を設けたことを特徴とする易開封性袋。1. An ultrasonic horn , which is formed of a packaging material having a heat-adhesive resin laminated on an inner surface thereof, wherein an outer peripheral seal portion has linear irregularities in a direction perpendicular to the outer edge and vibrates up and down.
Packaging material between the rotating jig and the straight knurl
An easy-open bag, characterized in that a weakened area constituted by irregularities formed in a continuous state by passing through is provided.
おいて、上下振動する超音波ホーンと直線状のローレッ
トが刻まれた回転治具の間に包装材を通すことにより、
前記包装材の側縁と直角な方向の線状の凹凸を前記包装
材の両側縁に沿って帯状に形成した後、該帯状部分を重
ね合わせた状態でヒートシールして製袋することを特徴
とする易開封性袋の製造方法。2. The method for manufacturing an easily- openable bag according to claim 1, wherein the ultrasonic horn vibrating up and down and the linear knurl are provided.
By passing the packaging material between the rotating jigs
After forming linear irregularities in a direction perpendicular to a side edge of the packaging material in a band shape along both side edges of the packaging material, heat sealing is performed in a state where the band portions are overlapped to form a bag. A method for producing an easy-open bag.
らなる袋において、外縁の折曲げ部に、該外縁と直角な
方向の線状の凹凸であって、上下振動する超音波ホーン
と直線状のローレットが刻まれた回転治具の間に包装材
を通すことにより連続状態で形成した凹凸により構成さ
れた弱化領域を設けたことを特徴とする易開封性袋。3. A bag made of a packaging material in which a heat-adhesive resin is laminated on an inner surface, wherein an ultrasonic horn which has a linear unevenness in a direction perpendicular to the outer edge and which vibrates up and down is formed at a bent portion of the outer edge.
Packaging material between the rotating jig and the straight knurl
An easy-open bag, characterized in that a weakened area constituted by irregularities formed in a continuous state by passing through is provided.
おいて、上下振動する超音波ホーンと直線状のローレッ
トが刻まれた回転治具の間に包装材を通すことにより、
前記包装材を折り曲げる方向と直角な方向の線状の凹凸
を前記包装材の折曲げ部を覆うようにして帯状に形成し
た後、該帯状部分を折り曲げた状態で製袋することを特
徴とする易開封性袋の製造方法。4. A method for manufacturing an easily- openable bag according to claim 3, wherein the ultrasonic horn vibrating up and down and the linear knurl are provided.
By passing the packaging material between the rotating jigs
After forming linear irregularities in a direction perpendicular to the direction in which the packaging material is bent so as to cover the bent portion of the packaging material, a bag is formed in a state where the belt-shaped portion is folded. Manufacturing method of easy-open bag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3219383A JP3059788B2 (en) | 1991-08-06 | 1991-08-06 | Easy-open bag and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3219383A JP3059788B2 (en) | 1991-08-06 | 1991-08-06 | Easy-open bag and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0542951A JPH0542951A (en) | 1993-02-23 |
| JP3059788B2 true JP3059788B2 (en) | 2000-07-04 |
Family
ID=16734560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3219383A Expired - Fee Related JP3059788B2 (en) | 1991-08-06 | 1991-08-06 | Easy-open bag and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3059788B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019198809A1 (en) * | 2018-04-13 | 2019-10-17 | 株式会社Ｗ | Freshness-retaining bag and method for producing same |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100471654C (en) * | 2002-04-25 | 2009-03-25 | 加川清二 | Linearly easy-to-rupture thermoplastic resin film, and method and device for manufacturing the resin film |
| JP4211970B2 (en) * | 2002-12-16 | 2009-01-21 | ニシムラ化学株式会社 | Medicine wrapping paper |
| JP4499674B2 (en) * | 2006-02-27 | 2010-07-07 | 大成ラミック株式会社 | Laminated material for easy tear packaging, method for producing the same, and packaging bag using the same |
| TWI511865B (en) * | 2009-01-20 | 2015-12-11 | Gerald F Rocha | Method and apparatus for producing hook fasteners |
| JP5284862B2 (en) * | 2009-04-28 | 2013-09-11 | 電気化学工業株式会社 | Film and manufacturing method thereof |
| CN116211597A (en) * | 2021-12-02 | 2023-06-06 | 尤妮佳股份有限公司 | Storage body for absorbent article and package body set for absorbent article |
| JP7126598B1 (en) * | 2021-12-07 | 2022-08-26 | ユニ・チャーム株式会社 | Absorbent article container and absorbent article package group |
-
1991
- 1991-08-06 JP JP3219383A patent/JP3059788B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019198809A1 (en) * | 2018-04-13 | 2019-10-17 | 株式会社Ｗ | Freshness-retaining bag and method for producing same |
| JP2019182508A (en) * | 2018-04-13 | 2019-10-24 | 株式会社Ｗ | Bag body for holding freshness and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0542951A (en) | 1993-02-23 |
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