JPH0789569A - Packing material - Google Patents
Packing materialInfo
- Publication number
- JPH0789569A JPH0789569A JP5230031A JP23003193A JPH0789569A JP H0789569 A JPH0789569 A JP H0789569A JP 5230031 A JP5230031 A JP 5230031A JP 23003193 A JP23003193 A JP 23003193A JP H0789569 A JPH0789569 A JP H0789569A
- Authority
- JP
- Japan
- Prior art keywords
- resin foam
- packing material
- polyolefin resin
- expansion ratio
- surface layer
- 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.)
- Pending
Links
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Closures For Containers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、主として食用缶、化粧
瓶等の蓋部に好適に用いられるパッキング材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing material suitable for use mainly as a lid for food cans, cosmetic bottles and the like.
【０００２】[0002]
【従来の技術】従来、食用缶や化粧瓶等の蓋部には、気
密性を向上させるために、ポリオレフィン系樹脂発泡体
からなるパッキング材が使用されている。例えば、発泡
倍率５倍程度で厚み１〜３ｍｍ程度のポリエチレン樹脂
発泡体の表面に厚み５０〜１００μｍ程度のポリエチレ
ン樹脂フィルムをラミネートしてなるパッキング材等が
一般的に使用されているが、このような構成のパッキン
グ材の場合、発泡体の片側もしくは両側表面にフィルム
をラミネートする必要があり製造工程が煩雑になると共
にコスト高ともなるという問題点があった。又、パッキ
ング材の厚み精度が不充分であったり、時間経過ととも
にフィルムが剥離したりする品質面の問題点もあった。2. Description of the Related Art Heretofore, a packing material made of a polyolefin resin foam has been used for a lid portion of an edible can, a cosmetic bottle or the like in order to improve airtightness. For example, a packing material obtained by laminating a polyethylene resin film having a thickness of about 50 to 100 μm on the surface of a polyethylene resin foam having a foaming ratio of about 5 times and a thickness of about 1 to 3 mm is generally used. In the case of a packing material having such a structure, there is a problem that a film needs to be laminated on one or both surfaces of the foam, which complicates the manufacturing process and increases the cost. In addition, there is a problem in terms of quality such that the thickness accuracy of the packing material is insufficient and the film peels off with the passage of time.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、上記従来の
問題点を解決するため、フィルムのラミネート工程を必
要としない簡便な製造法で得られ、優れた厚み精度と表
面平滑性を有するポリオレフィン系樹脂発泡体からなる
パッキング材を提供することを目的とする。In order to solve the above-mentioned conventional problems, the present invention is obtained by a simple production method which does not require a film laminating step, and has excellent thickness accuracy and surface smoothness. An object of the present invention is to provide a packing material made of a resin foam.
【０００４】[0004]
【課題を解決するための手段】本発明のパッキング材
は、中層部の発泡倍率が１５倍以下で表層部の発泡倍率
が中層部の発泡倍率より１倍以上低く、且つ、表層部の
表面平滑度が３．０μ以下であるポリオレフィン系樹脂
発泡体からなることを特徴とし、そのことにより上記目
的が達成される。The packing material of the present invention has a foaming ratio of 15 times or less in the middle layer portion, a foaming ratio of the surface layer portion is 1 time or more lower than that of the middle layer portion, and the surface of the surface layer portion is smooth. It is characterized by comprising a polyolefin-based resin foam having a degree of 3.0 μ or less, whereby the above object is achieved.
【０００５】尚、ここで言うポリオレフィン系樹脂発泡
体の表層部とは、発泡体の両側の面それぞれの表面から
０．２ｍｍ厚までの層を言い、中層部とは表層部以外の
層を言う。又、ここで言う発泡倍率とは、発泡前のポリ
オレフィン系樹脂の２０℃における密度（ｇ／ｃｍ3 ）
を、ＪＩＳ Ｋ−６７６７「ポリエチレンフォーム試験
方法」に準じて測定した発泡後のポリオレフィン系樹脂
発泡体の２０℃における見掛け密度（ｇ／ｃｍ3 ）で除
した値（倍）を言う。The surface layer portion of the polyolefin resin foam referred to here is a layer having a thickness of 0.2 mm from both surfaces of the foam body, and the middle layer portion is a layer other than the surface layer portion. . The expansion ratio here means the density (g / cm 3 ) of the polyolefin resin before foaming at 20 ° C.
Is divided by the apparent density (g / cm 3 ) of the foamed polyolefin resin foam at 20 ° C. measured according to JIS K-6767 “Polyethylene foam test method”.
【０００６】本発明のパッキング材に用いるポリオレフ
ィン系樹脂の種類としては、特に限定されるものではな
いが、ポリエチレン樹脂、ポリプロピレン樹脂、エチレ
ン−プロピレン共重合体樹脂、エチレン−酢酸ビニル共
重合体樹脂、エチレン−アクリル酸共重合体樹脂等が挙
げられ、なかでもポリエチレン樹脂が好適に用いられ
る。The type of polyolefin resin used for the packing material of the present invention is not particularly limited, but polyethylene resin, polypropylene resin, ethylene-propylene copolymer resin, ethylene-vinyl acetate copolymer resin, Examples thereof include ethylene-acrylic acid copolymer resin, and among them, polyethylene resin is preferably used.
【０００７】上記ポリオレフィン系樹脂の発泡体を得る
方法は、特に限定されるものではなく、押出し一段法の
ような無架橋法、放射線架橋法、化学架橋法、プレス架
橋法のような架橋法等通常行われている各種方法で良い
が、高温時の粘性やゲル分のコントロール等を考慮する
と放射線架橋法、化学架橋法等が好ましい。例えば放射
線架橋法の場合、ポリエチレン樹脂に発泡剤、発泡助剤
等を混合し、放射線を照射して架橋を行ったのち１６０
〜１８０℃程度の温度に加熱して発泡させることにより
容易に所望のポリエチレン樹脂発泡体を得ることが出来
る。The method for obtaining the above-mentioned polyolefin resin foam is not particularly limited, and a non-crosslinking method such as a one-step extrusion method, a radiation crosslinking method, a chemical crosslinking method, a crosslinking method such as a press crosslinking method, etc. Although various methods that are usually used may be used, the radiation crosslinking method, the chemical crosslinking method, and the like are preferable in consideration of the viscosity at high temperature, control of gel content, and the like. For example, in the case of the radiation cross-linking method, a polyethylene resin is mixed with a foaming agent, a foaming aid, etc., and radiation is applied to carry out cross-linking.
A desired polyethylene resin foam can be easily obtained by heating to a temperature of about 180 ° C. and foaming.
【０００８】本発明のパッキング材に用いる上記ポリオ
レフィン系樹脂発泡体の中層部の発泡倍率は１５倍以下
であることが必要である。ポリオレフィン系樹脂発泡体
の中層部の発泡倍率が１５倍を超えると、得られるパッ
キング材の強度が弱く損傷を起こし易くなるし、圧縮永
久歪みも悪くなるので気密性が低下しパッキング材とし
ての機能を充分発現しなくなる。The expansion ratio of the middle layer of the polyolefin resin foam used in the packing material of the present invention must be 15 times or less. When the expansion ratio of the middle layer of the polyolefin resin foam exceeds 15 times, the strength of the obtained packing material is weak and the damage tends to occur, and the compression set also deteriorates, so the airtightness decreases and the function as a packing material. Will not be fully expressed.
【０００９】本発明のパッキング材においては、ポリオ
レフィン系樹脂発泡体の表層部の発泡倍率は中層部の発
泡倍率より１倍以上低いことが必要である。即ち〔中層
部の発泡倍率−表層部の発泡倍率≧１倍〕の関係が成立
することが必要である。In the packing material of the present invention, it is necessary that the expansion ratio of the surface layer portion of the polyolefin resin foam is lower than the expansion ratio of the middle layer portion by at least 1 time. That is, it is necessary that the relationship of [foaming ratio of the middle layer portion-foaming ratio of the surface layer portion ≧ 1 time] is satisfied.
【００１０】中層部の発泡倍率から表層部の発泡倍率を
引いた差が１倍未満であると、表層部の表面平滑性やパ
ッキング材の厚み精度が不充分となり気密性やシール性
の低下を招きパッキング材としての機能を充分発現しな
くなる。If the difference obtained by subtracting the expansion ratio of the surface layer from the expansion ratio of the middle layer is less than 1 times, the surface smoothness of the surface layer and the thickness accuracy of the packing material become insufficient, resulting in deterioration of airtightness and sealing property. The function as a packing material is not sufficiently exhibited.
【００１１】本発明のパッキング材においては、ポリオ
レフィン系樹脂発泡体の表層部の表面平滑度は３．０μ
以下であることが必要である。尚、ここで言う表面平滑
度とは、表面粗さ計（触針法）で測定した表面の平滑度
（μ）を言う。In the packing material of the present invention, the surface smoothness of the surface layer portion of the polyolefin resin foam is 3.0 μm.
It must be: The surface smoothness referred to here means the surface smoothness (μ) measured by a surface roughness meter (stylus method).
【００１２】ポリオレフィン系樹脂発泡体の表層部の表
面平滑度が３．０μを超えると表層部の表面平滑性や厚
み精度が不充分となり気密性やシール性の低下を招きパ
ッキング材としての機能を充分発現しなくなる。When the surface smoothness of the surface layer portion of the polyolefin resin foam exceeds 3.0 μ, the surface smoothness and thickness accuracy of the surface layer portion become insufficient, resulting in deterioration of airtightness and sealability, and the function as a packing material. Not fully expressed.
【００１３】本発明においては、ポリオレフィン系樹脂
発泡体の表面にポリオレフィン系樹脂フィルムをラミネ
ートする従来技術で行われている方法の代わりに、ポリ
オレフィン系樹脂発泡体の表層部表面に火炎を直接接触
させ、その直後に冷却成形ロール等で押し圧する押し圧
加工を施すことにより、表層部の発泡倍率が中層部の発
泡倍率より１倍以上低く、且つ、表面平滑度が３．０μ
以下の表層部を有する厚み精度と表面平滑性に優れたポ
リオレフィン系樹脂発泡体を得ることが出来る。次い
で、得られたポリオレフィン系樹脂発泡体を所定の形状
に打ち抜き加工することにより所望のパッキング材を得
ることが出来る。In the present invention, instead of the conventional method of laminating a polyolefin resin film on the surface of a polyolefin resin foam, a flame is brought into direct contact with the surface layer surface of the polyolefin resin foam. Immediately after that, by performing a pressing process of pressing with a cooling molding roll or the like, the expansion ratio of the surface layer part is 1 time or more lower than the expansion ratio of the middle layer part, and the surface smoothness is 3.0 μm.
It is possible to obtain a polyolefin resin foam having the following surface layer portions and having excellent thickness accuracy and surface smoothness. Then, the obtained polyolefin resin foam is punched into a predetermined shape to obtain a desired packing material.
【００１４】上記表層部を有するポリオレフィン系樹脂
発泡体を得る具体的な方法は、特に限定されるものでは
ないが、例えば、厚み１〜５ｍｍ程度のポリオレフィン
系樹脂発泡体シートを１５〜２５ｍ／分程度のラインス
ピードで送りながらその片側表面にガスバーナー等で直
接火炎を接触させ２００〜５００℃程度に加熱した後、
直ちに１５〜３０℃程度に冷却された成形ロールで押し
圧加工することにより所望の表層部を有するポリオレフ
ィン系樹脂発泡体を簡便に得ることが出来る。ポリオレ
フィン系樹脂発泡体の両側表面を同様に加工したい時は
それぞれの表面に対し同様の操作を施せば良い。The specific method for obtaining the polyolefin resin foam having the surface layer is not particularly limited, but for example, a polyolefin resin foam sheet having a thickness of about 1 to 5 mm is used at 15 to 25 m / min. After sending the flame at a line speed of about 1 to one side surface with a flame directly by a gas burner or the like and heating to about 200 to 500 ° C,
A polyolefin resin foam having a desired surface layer portion can be easily obtained by immediately pressing with a molding roll cooled to about 15 to 30 ° C. When it is desired to similarly process both surfaces of the polyolefin resin foam, the same operation may be performed on each surface.
【００１５】[0015]
【作用】本発明のパッキング材は、表面に押し圧加工を
施して優れた厚み精度と表面平滑性を付与し、且つ、フ
ィルムラミネート法に見られるフィルム剥離の懸念も無
いポリオレフィン系樹脂発泡体からなるので気密性、耐
久性等パッキング材として必要な性能に優れていると共
に、簡便な製造方法で得られるので低コスト化も可能な
ものである。The packing material of the present invention is made of a polyolefin resin foam which is subjected to pressing on the surface to impart excellent thickness accuracy and surface smoothness, and which is free from the fear of film peeling which is seen in the film laminating method. Therefore, the performance required for a packing material such as airtightness and durability is excellent, and the cost can be reduced because it can be obtained by a simple manufacturing method.
【００１６】[0016]
【実施例】この発明をさらに詳しく説明するため、以下
に実施例をあげる。EXAMPLES In order to explain the present invention in more detail, examples will be given below.
【００１７】（実施例）(Example)
【００１８】（ａ）ポリエチレン樹脂発泡体シートの作
成と表面加工 発泡倍率が６．３倍で厚み２．１ｍｍのポリエチレン樹
脂発泡体シートを放射線架橋法により作成し、この発泡
体シートをラインスピード２０ｍ／分で送りながら片側
表面にガスバーナーで火炎を直接接触させ、直ちに２３
℃の冷却成形ロールで押し圧して片側表面を押し圧加工
したポリエチレン樹脂発泡体シートを得た。次いで、上
記発泡体シートの反対側の表面にも同様の操作を施し両
側表面を押し圧加工したポリエチレン樹脂発泡体シート
を得た。(A ) Production of polyethylene resin foam sheet
Composition and surface processing A polyethylene resin foam sheet with a foaming ratio of 6.3 times and a thickness of 2.1 mm was created by the radiation crosslinking method, and while sending this foam sheet at a line speed of 20 m / min, a flame was applied to one surface with a gas burner. Directly contact and immediately
A polyethylene resin foam sheet having a surface pressed on one side by pressing with a cooling molding roll at ℃ was obtained. Then, the same operation was performed on the surface on the opposite side of the foam sheet to obtain a polyethylene resin foam sheet having both surfaces pressed and processed.
【００１９】（ｂ）評価 得られた両側表面に押し圧加工が施されたポリエチレン
樹脂発泡体シートの各種物性を下記の方法で評価した結
果は表１に示すとおりであった。尚、測定はすべて２０
℃−６５％ＲＨの雰囲気下で行った。( B) Evaluation The various physical properties of the obtained polyethylene resin foam sheet having both surfaces subjected to pressing are evaluated by the following methods, and the results are shown in Table 1. In addition, all measurements are 20
C.-65% RH was performed in the atmosphere.
【００２０】表面平滑性：表面粗さ計（触針法）を用
いて上記ポリエチレン樹脂発泡体シートの表面の平滑度
（μ）を測定した。 Surface smoothness : The surface smoothness (μ) of the polyethylene resin foam sheet was measured using a surface roughness meter (stylus method).
【００２１】厚み及び厚み精度：ＪＩＳ Ｋ−６７６
７「ポリエチレンフォーム試験方法」に準じ、精度０．
１ｍｍのダイヤルゲージを用いて、測定子面積１０ｃｍ
2 、測定子圧２ｇｆ／ｃｍ2 で上記ポリエチレン樹脂発
泡体シートの厚み（ｍｍ）を測定し標準偏差を算出し
た。尚、測定はｎ＝１００で行った。 Thickness and thickness accuracy : JIS K-676
According to "Test method for polyethylene foam", accuracy is 0.
Using a 1 mm dial gauge, measuring area 10 cm
2. The thickness (mm) of the polyethylene resin foam sheet was measured with a probe pressure of 2 gf / cm 2 and the standard deviation was calculated. The measurement was performed at n = 100.
【００２２】表層部の発泡倍率：上記ポリエチレン樹
脂発泡体シートの両側表面の表層部のみをそれぞれ厚み
０．２ｍｍで水平に切断して得た表層部の試料の見掛け
密度をＪＩＳ Ｋ−６７６７に準じて測定した。予め測
定しておいたポリエチレン樹脂の２０℃における密度
（ｇ／ｃｍ3 ）を上記で得られた表層部の見掛け密度
（ｇ／ｃｍ3 ）で除して表層部の発泡倍率（倍）を求め
た。 Expansion ratio of surface layer : The apparent density of a sample of the surface layer obtained by horizontally cutting only the surface layers on both sides of the polyethylene resin foam sheet to a thickness of 0.2 mm is in accordance with JIS K-6767. Measured. The density (g / cm 3 ) of the polyethylene resin measured in advance at 20 ° C. is divided by the apparent density (g / cm 3 ) of the surface layer obtained above to obtain the expansion ratio (times) of the surface layer. It was
【００２３】中層部の発泡倍率：両側表面の表層部が
それぞれ厚み０．２ｍｍで水平に切断されて除去された
ポリエチレン樹脂発泡体シートを中層部の試料とし、Ｊ
ＩＳＫ−６７６７に準じて見掛け密度を測定した。予め
測定しておいたポリエチレン樹脂の２０℃における密度
（ｇ／ｃｍ3 ）を上記で得られた中層部の見掛け密度
（ｇ／ｃｍ3 ）で除して中層部の発泡倍率（倍）を求め
た。 Foaming ratio of the middle layer : A polyethylene resin foam sheet obtained by horizontally cutting the surface layers on both sides to a thickness of 0.2 mm and removing it was used as a sample for the middle layer.
The apparent density was measured according to ISK-6767. The density (g / cm 3 ) of the polyethylene resin measured in advance at 20 ° C. is divided by the apparent density (g / cm 3 ) of the middle layer obtained above to obtain the expansion ratio (times) of the middle layer. It was
【００２４】（比較例）(Comparative example)
【００２５】実施例で作成したポリエチレン樹脂発泡体
シートの両側表面を押し圧加工することなく、各種物性
を実施例と同様にして評価した結果は表１に示すとおり
であった。Table 1 shows the results of evaluation of various physical properties in the same manner as in the examples without pressing both side surfaces of the polyethylene resin foam sheets prepared in the examples.
【００２６】[0026]
【表１】 [Table 1]
【００２７】[0027]
【発明の効果】以上述べたように、本発明によるパッキ
ング材は、優れた厚み精度と表面平滑性を有するポリオ
レフィン系樹脂発泡体からなるので気密性、耐久性等パ
ッキング材として必要な性能に優れており、主として食
用缶、化粧瓶等の蓋部のシール用として好適に用いられ
るものである。又、簡便な製造方法で得られるので低コ
スト化も可能なものである。As described above, since the packing material according to the present invention is made of the polyolefin resin foam having excellent thickness accuracy and surface smoothness, it is excellent in performance required as a packing material such as airtightness and durability. It is suitable for use mainly as a seal for lids such as edible cans and cosmetic bottles. Further, since it can be obtained by a simple manufacturing method, it is possible to reduce the cost.
Claims (1)
部の発泡倍率が中層部の発泡倍率より１倍以上低く、且
つ、表層部の表面平滑度が３．０μ以下であるポリオレ
フィン系樹脂発泡体からなることを特徴とするパッキン
グ材。1. A polyolefin system in which the expansion ratio of the middle layer is 15 times or less, the expansion ratio of the surface layer is 1 time or more lower than the expansion ratio of the middle layer, and the surface smoothness of the surface layer is 3.0 μ or less. A packing material comprising a resin foam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5230031A JPH0789569A (en) | 1993-09-16 | 1993-09-16 | Packing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5230031A JPH0789569A (en) | 1993-09-16 | 1993-09-16 | Packing material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0789569A true JPH0789569A (en) | 1995-04-04 |
Family
ID=16901487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5230031A Pending JPH0789569A (en) | 1993-09-16 | 1993-09-16 | Packing material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0789569A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000506820A (en) * | 1996-03-11 | 2000-06-06 | ザ・ダウ・ケミカル・カンパニー | Foamed gasket made from homogeneous olefin polymer |
| JP2004075122A (en) * | 2002-08-19 | 2004-03-11 | Toray Ind Inc | Packing material |
| JP2010030643A (en) * | 2008-07-30 | 2010-02-12 | Yukio Tsuchiya | Method for manufacturing container cap |
| JP2014122044A (en) * | 2012-12-20 | 2014-07-03 | Mitsui Chemicals Tohcello Inc | Packing for cap for sealing opening of container, lid body provided with the same, and sealed container |
| JP2015193393A (en) * | 2014-03-31 | 2015-11-05 | 大和製罐株式会社 | Gasket |
-
1993
- 1993-09-16 JP JP5230031A patent/JPH0789569A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000506820A (en) * | 1996-03-11 | 2000-06-06 | ザ・ダウ・ケミカル・カンパニー | Foamed gasket made from homogeneous olefin polymer |
| JP2004075122A (en) * | 2002-08-19 | 2004-03-11 | Toray Ind Inc | Packing material |
| JP2010030643A (en) * | 2008-07-30 | 2010-02-12 | Yukio Tsuchiya | Method for manufacturing container cap |
| JP2014122044A (en) * | 2012-12-20 | 2014-07-03 | Mitsui Chemicals Tohcello Inc | Packing for cap for sealing opening of container, lid body provided with the same, and sealed container |
| JP2015193393A (en) * | 2014-03-31 | 2015-11-05 | 大和製罐株式会社 | Gasket |
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