JP4146007B2 - Improved sealed chuck - Google Patents
Improved sealed chuck Download PDFInfo
- Publication number
- JP4146007B2 JP4146007B2 JP27371398A JP27371398A JP4146007B2 JP 4146007 B2 JP4146007 B2 JP 4146007B2 JP 27371398 A JP27371398 A JP 27371398A JP 27371398 A JP27371398 A JP 27371398A JP 4146007 B2 JP4146007 B2 JP 4146007B2
- Authority
- JP
- Japan
- Prior art keywords
- nail
- chuck
- female
- continuous
- pressing rib
- 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
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Description
【0001】
【発明の属する技術分野】
食品、薬品、電子部品の包装容器に使用される密閉性を持ちながら開口が容易で再封止可能なプラスチックチャックに関する。
【0002】
【従来の技術】
プラスチックの表面に形成されたプラスチックチャックの雄爪の内側に該爪と平行に連続締付壁を形成し、雌爪の内側に該爪と平行に連続押付リブを形成している。プラスチックチャックの材質は剛性のあるものが望ましくこれによって内容物側からの静水圧による開口を防止する。
【0003】
雄側の一対の爪の内側は連続した溝で連続締付壁を形成しており溝の断面は先細構造(テーパー構造)になっている。また雌側の中心部には連続押付リブが構成されるがこの連続押付リブは雄側の連続締付壁との間で自緊式のシール部を構成するとともに雄爪が外力によって内側に変形することを防止する。
【0004】
連続押付リブをゴム状弾性物質のごとき材質によって形成するとチャックの嵌合の際に適度の反発性を持っているため嵌合と脱着が容易になると同時に連続締付壁と連続押付リブとの密着性や自緊効果によって密閉性能が著しく向上する(USP−5,689,866)。
【0005】
従来技術では、チャックが低密度ポリエチレンのごとき柔軟性をもった材質であれば連続締付壁と連続押付リブは容易に密着するが、ポリプロピレンやリニヤ低密度ポリエチレンのごとき柔軟性の少ない材質の場合は密着性を保持するためチャックの寸法精度が要求され、そのため生産性に問題が生ずる。
【0006】
更に従来技術では連続押付リブをゴム状弾性物質のごとき材質によって形成すると良いと記載され、具体的なゴム状物質に関してはポリブテンのみを記載しているが、雌爪の材質がポリプロピレンやポリエチレンの場合は雌爪との接着性が悪く適当な接着材を使用しなければ雌爪とポリブテン連続締付壁が剥離する欠点があり生産に際してコストアップの要因となる。
【0007】
【発明が解決しようとする課題】
本発明者らは鋭意研究した結果、連続締付壁の材質を選定することによって柔軟性の少ないチャック材質であっても生産性の良い密閉チャックを開発した。
【0008】
【課題を解決するための手段】
本発明はプラスチックの表面に形成された雄/雌一対の爪によって構成されたプラスチックチャックの雄爪の内側に該雄爪と平行に形成された連続締付壁と、雌爪の内側に該雌爪と平行に形成された連続押付リブによって密閉を保持するプラスチックチャックにあって、雌爪の材質がポリエチレン、ポリプロピレンの単体あるいは少くともどちらか一方を含む混合物であるとき、連続押付リブの材質がエチレン・プロピレン共重合体あるいは該共重合体を3%以上含む樹脂混合物としている。
【0009】
連続押付リブの材質をこの様にすることにより、該リブの柔軟性を増し連続締付壁との密着性を高めることができ、同時に基部との接着を確保することができる。
【0010】
【発明の実施の形態】
本発明の実施の形態を図面によってさらに詳しく説明する。
図1に於いて雄爪11によって構成される雄チャックの内側に連続締付壁12が形成され、雌爪13によって構成される雌チャックの内側の基部14上に連続押付リブ15−1が形成されている。通常は雄爪11と雌爪13は同一材料が用いられる。
【0011】
チャックのシール機能は、連続締付壁12と連続押付リブ15の接触によって行なわれているため、連続押付リブの柔軟性がシール機能に与える影響は大きい。
柔軟性のある連続押付リブを持ったチャックの構造を図2に示す。基部14は雌爪の材質と同一であり、連続押付リブ15−2と基部14との界面16の接着性は重要である。連続押付リブ15−2は界面16の接着性を維持しつつ連続締付壁12との接触面における親和性と密着性が求められる。
【0012】
雌爪13の材質がポリエチレン、ポリプロピレンの単体あるいは少くともどちらか一方を含む混合物であるとき、連続押付リブ15−2の材料は、エチレン・プロピレン共重合体あるいは雌爪と同材質または該材質と接着性の良好な材質と該共重合体の混合物を使用することにより界面16との接着性と柔軟性をもち、連続締付壁12との接触面の親和性と密着性のある連続押付リブを得ることができた。ここで該材質と接着性の良好な材料とは雌爪の材料と押出ラミネートをしたときその界面の接着強度が0.6kg/15mm幅以上ある材料をいう。
この時のエチレン・プロピレン共重合体の混合割合は3%以上であれば接着性、柔軟性、密着性のバランスがとれている。
【0013】
【実施例】
(実施例1)
袋の内側と外側がそれぞれ厚さ60μmのポリプロピレン樹脂フィルムと15μmのポリアミド樹脂フィルムとなるようにドライラミネートした積層フィルムで作製した140mm幅×200mm高の平袋の内側に、雄爪および雌爪部分の材質がポリプロピレン樹脂で、押付リブの材質がエチレン・プロピレン共重合体80部とポリプロピレン樹脂20部を混合した樹脂組成物である図2と同じ構造のチャックを袋の開口部分に取り付けた後、JIS Z−0238に準じた方法で開口強度を測定したところ平均で5.3kg/5cm幅であった。
【0014】
この袋に水を700cc充填したのち、JIS Z−0238に準じた方法で落下高さ30cmより水平方向とチャックが床面に当たる方向で落下強さを測定し、さらに圧縮強さ45kgfで圧縮強さを測定したところ表1に示すとおりの結果を得た。この結果により、本チャックは耐衝撃性と液体封止の面で実用性があると判断された。
【0015】
【表1】
【0016】
(実施例2)
袋の内側と外側がそれぞれ厚さ60μmのLL−ポリエチレン樹脂フィルムと15μmのポリアミド樹脂フィルムとなるようにドライラミネートした積層フィルムで作製した実施例1と同様の平袋の内側に、雄爪および雌爪部分の材質がLL−ポリエチレン樹脂で、押付リブの材質がエチレン・プロピレン共重合体5部とLL−ポリエチレン樹脂95部を混合した樹脂組成物である図2と同じ構造のチャックを袋の開口部分に取り付けた後、実施例1と同様の試験方法で開口強度を測定したところ平均で5.0kg/5cm幅であった。
【0017】
この袋に水を700cc充填したのち、実施例1と同様の方法で落下強さと圧縮強さをを測定したところ表2に示すとおりの結果を得た。この結果により、本チャックは耐衝撃性と液体封止の面で実用性があると判断された。
【0018】
【表2】
【0019】
(比較例1)
実施例1と同じ材質、サイズ、構造の平袋に、雄爪、雌爪および押付リブ部分の材質が総てポリプロピレン樹脂の図1と同じ構造のチャックを袋の開口部分に取り付けた後、実施例1と同じ試験を実施した。
結果は表3に示すとおりで、本チャックは耐衝撃性は優れているが液体封止の面で実用性に問題があると判断された。
【0020】
【表3】
【0021】
(比較例2)
実施例2と同じ材質、サイズ、構造の平袋に、雄爪、雌爪および押付リブ部分の材質が総てLL−ポリエチレン樹脂の図1と同じ構造のチャックを袋の開口部分に取り付けた後、実施例2と同じ試験を実施した。
結果は表4に示すとおりで、本チャックは耐衝撃性は優れているが液体封止の面で実用性にやや問題があると判断された。
【0022】
【表4】
【0023】
【発明の効果】
本発明は、以上説明したような形態で実施され、連続押付リブと連続締付壁との密着性を増し、密閉性の改善されたプラスチックチャックを効率よく生産できる。耐衝撃性と液体封止の面で実用性がある再封止可能なプラスチックチャック袋を提供できる。
【図面の簡単な説明】
【図1】従来の密閉性を持つプラスチックチャックの断面図である。
【図2】本発明により密閉性を高めたプラスチックチャックの断面図である。
【符号の説明】
11 雄爪
12 連続締付壁
13 雌爪
14 雌チャック基部
15−1 基部と同材質の連続押付リブ
15−2 エチレン・プロピレン共重合体の連続押付リブ
16 基部と連続押付リブの接着界面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plastic chuck that is easy to open and resealable while having a hermeticity used for packaging containers for foods, medicines, and electronic parts.
[0002]
[Prior art]
A continuous clamping wall is formed inside the male nail of the plastic chuck formed on the plastic surface parallel to the nail, and a continuous pressing rib is formed inside the female nail parallel to the nail. The plastic chuck is preferably made of a rigid material, which prevents opening due to hydrostatic pressure from the contents side.
[0003]
Inside the pair of male claws, a continuous fastening wall is formed by a continuous groove, and the cross section of the groove has a tapered structure (taper structure). A continuous pressing rib is formed at the center of the female side. This continuous pressing rib forms a self-tightening seal with the male continuous clamping wall, and the male claw is deformed inward by external force. To prevent.
[0004]
If the continuous pressing rib is made of a material such as a rubber-like elastic material, it will have a moderate resilience when the chuck is fitted, making it easy to fit and detach, and at the same time, contact the continuous clamping wall with the continuous pressing rib. The sealing performance is remarkably improved by the property and self-tightening effect (USP-5,689,866).
[0005]
In the conventional technology, if the chuck is made of a flexible material such as low density polyethylene, the continuous clamping wall and the continuous pressing rib can be easily adhered to each other, but if the material is less flexible such as polypropylene or linear low density polyethylene. Requires the dimensional accuracy of the chuck in order to maintain adhesion, which causes a problem in productivity.
[0006]
Furthermore, in the prior art, it is stated that the continuous pressing rib should be formed of a material such as a rubber-like elastic material, and only polybutene is described for a specific rubber-like material, but when the material of the female nail is polypropylene or polyethylene Has a drawback in that the adhesiveness to the female nail is poor and an appropriate adhesive is not used, and the female nail and the polybutene continuous fastening wall are peeled off, which causes an increase in cost during production.
[0007]
[Problems to be solved by the invention]
As a result of diligent research, the present inventors have developed a sealed chuck with good productivity even with a less flexible chuck material by selecting the material of the continuous clamping wall.
[0008]
[Means for Solving the Problems]
The present invention relates to a continuous clamping wall formed in parallel with a male nail inside a male nail of a plastic chuck constituted by a pair of male / female claws formed on a plastic surface, and the female nail inside a female nail. In a plastic chuck that keeps hermetically sealed by a continuous pressing rib formed in parallel with the claw, when the material of the female claw is a single or a mixture of at least one of polyethylene and polypropylene, the material of the continuous pressing rib is An ethylene / propylene copolymer or a resin mixture containing 3% or more of the copolymer is used.
[0009]
By making the material of the continuous pressing rib in this way, the flexibility of the rib can be increased and the adhesion to the continuous clamping wall can be enhanced, and at the same time, the adhesion to the base can be ensured.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in more detail with reference to the drawings.
In FIG. 1, a continuous
[0011]
Since the sealing function of the chuck is performed by contact between the
FIG. 2 shows the structure of a chuck having flexible continuous pressing ribs. The
[0012]
When the material of the
If the mixing ratio of the ethylene / propylene copolymer at this time is 3% or more, the adhesiveness, flexibility and adhesion are balanced.
[0013]
【Example】
(Example 1)
Male and female nails are placed on the inside of a 140 mm wide x 200 mm high flat bag made of a laminated film that is dry-laminated so that the inside and outside of the bag are a polypropylene resin film having a thickness of 60 μm and a polyamide resin film having a thickness of 15 μm, respectively. 2 is a polypropylene resin, and the pressing rib material is a resin composition in which 80 parts of ethylene / propylene copolymer and 20 parts of polypropylene resin are mixed. When the opening strength was measured by a method according to JIS Z-0238, the average width was 5.3 kg / 5 cm.
[0014]
After filling this bag with 700 cc of water, the drop strength is measured in the horizontal direction and the direction where the chuck hits the floor from a drop height of 30 cm by the method according to JIS Z-0238, and the compressive strength is 45 kgf. Was measured, and the results shown in Table 1 were obtained. From this result, this chuck was judged to be practical in terms of impact resistance and liquid sealing.
[0015]
[Table 1]
[0016]
(Example 2)
On the inside of a flat bag similar to that of Example 1 made of a laminated film dry-laminated so that the inner and outer sides of the bag are an LL-polyethylene resin film having a thickness of 60 μm and a polyamide resin film having a thickness of 15 μm. The zipper part is made of LL-polyethylene resin and the pressing rib is made of a resin composition in which 5 parts of ethylene / propylene copolymer and 95 parts of LL-polyethylene resin are mixed. After being attached to the part, the opening strength was measured by the same test method as in Example 1. As a result, the average width was 5.0 kg / 5 cm.
[0017]
After the bag was filled with 700 cc of water, the drop strength and the compressive strength were measured in the same manner as in Example 1. The results shown in Table 2 were obtained. From this result, this chuck was judged to be practical in terms of impact resistance and liquid sealing.
[0018]
[Table 2]
[0019]
(Comparative Example 1)
After attaching to the flat bag of the same material, size and structure as in Example 1 the chuck with the same structure as in FIG. The same test as in Example 1 was performed.
The results are as shown in Table 3. This chuck was judged to have a problem in practicality in terms of liquid sealing although it was excellent in impact resistance.
[0020]
[Table 3]
[0021]
(Comparative Example 2)
After attaching a chuck having the same structure as that of FIG. 1 in which the material of the male claws, female claws and pressing rib parts is the same as that shown in FIG. The same test as in Example 2 was performed.
The results are as shown in Table 4. This chuck was judged to have some problems in practicality in terms of liquid sealing although it was excellent in impact resistance.
[0022]
[Table 4]
[0023]
【The invention's effect】
The present invention is implemented in the form as described above, and can increase the adhesion between the continuous pressing rib and the continuous clamping wall and efficiently produce a plastic chuck with improved sealing performance. It is possible to provide a resealable plastic chuck bag that is practical in terms of impact resistance and liquid sealing.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a conventional plastic chuck having a sealing property.
FIG. 2 is a cross-sectional view of a plastic chuck with improved sealing performance according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Male nail | claw 12
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27371398A JP4146007B2 (en) | 1998-09-07 | 1998-09-28 | Improved sealed chuck |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10-252746 | 1998-09-07 | ||
JP25274698 | 1998-09-07 | ||
JP27371398A JP4146007B2 (en) | 1998-09-07 | 1998-09-28 | Improved sealed chuck |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2000142731A JP2000142731A (en) | 2000-05-23 |
JP4146007B2 true JP4146007B2 (en) | 2008-09-03 |
Family
ID=26540851
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27371398A Expired - Fee Related JP4146007B2 (en) | 1998-09-07 | 1998-09-28 | Improved sealed chuck |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP4146007B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7001245B2 (en) | 2019-08-01 | 2022-01-19 | 住友電工ハードメタル株式会社 | How to manufacture cutting tools |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003040290A (en) * | 2001-07-30 | 2003-02-13 | Fuji Seal Inc | Pouch container |
JP4675309B2 (en) * | 2006-11-07 | 2011-04-20 | 壽一 葛西 | Bag making method for bags with plastic chuck |
JP6126457B2 (en) * | 2013-05-22 | 2017-05-10 | 株式会社細川洋行 | Chuck molded product |
-
1998
- 1998-09-28 JP JP27371398A patent/JP4146007B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7001245B2 (en) | 2019-08-01 | 2022-01-19 | 住友電工ハードメタル株式会社 | How to manufacture cutting tools |
Also Published As
Publication number | Publication date |
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JP2000142731A (en) | 2000-05-23 |
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