JPH0584877A - Multi-layer container - Google Patents
Multi-layer containerInfo
- Publication number
- JPH0584877A JPH0584877A JP3249913A JP24991391A JPH0584877A JP H0584877 A JPH0584877 A JP H0584877A JP 3249913 A JP3249913 A JP 3249913A JP 24991391 A JP24991391 A JP 24991391A JP H0584877 A JPH0584877 A JP H0584877A
- Authority
- JP
- Japan
- Prior art keywords
- container
- layer
- outer layer
- polypropylene
- inner 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.)
- Granted
Links
- -1 polypropylene Polymers 0.000 claims abstract description 20
- 239000004743 Polypropylene Substances 0.000 claims abstract description 19
- 229920001155 polypropylene Polymers 0.000 claims abstract description 19
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 7
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 abstract description 11
- 239000011347 resin Substances 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010030 laminating Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 28
- 238000000034 method Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229920003002 synthetic resin Polymers 0.000 description 4
- 239000000057 synthetic resin Substances 0.000 description 4
- 238000004040 coloring Methods 0.000 description 3
- 238000004898 kneading Methods 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 229920005674 ethylene-propylene random copolymer Polymers 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は表面光沢性の優れた多層
容器に関する。FIELD OF THE INVENTION The present invention relates to a multilayer container having excellent surface gloss.
【０００２】[0002]
【従来の技術】従来、合成樹脂で形成される容器を多層
構造とすることが行われており、成形の際にいわゆるド
ローダウンやメルトフラクチュアを防止するためにメル
トフローレートが大きく、分子量分布の広い樹脂が用い
られている。2. Description of the Related Art Conventionally, containers made of synthetic resin have a multi-layer structure, and have a large melt flow rate and a molecular weight distribution to prevent so-called drawdown and melt fracture during molding. A wide range of resins are used.
【０００３】しかし、このような樹脂を用いて容器を成
形すると、透明性や表面光沢性が劣ったものとなる。表
面光沢性のよい容器を成形する方法として、多層容器の
外層材料の樹脂に特定のメルトフローレートと分子量分
布を有するエチレン−プロピレン・ランダム共重合体を
用いる方法（例えば特開平２−２１５５２９号）、ある
いは分子量分布の狭い樹脂を用いて、特定の厚さと曇度
を有する容器を特殊なパリソン形成ダイスを用いて成形
する方法（例えば特公平３−３２４５３号）が開示され
ている。However, when a container is molded using such a resin, the transparency and surface gloss are inferior. As a method for molding a container having good surface gloss, a method of using an ethylene-propylene / random copolymer having a specific melt flow rate and a specific molecular weight distribution as a resin for an outer layer material of a multi-layer container (for example, JP-A-2-215529). Or a resin having a narrow molecular weight distribution is used to mold a container having a specific thickness and haze using a special parison forming die (for example, Japanese Examined Patent Publication No. 3-32453).
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記の方法は
いずれも厳格な条件及び複雑な成形装置を必要とする。
特開平２−２１５５２９号の特許請求の範囲を引用する
と、「２種以上の樹脂層が積層された構造の多層プラス
チック容器において、最外表面層が、エチレン含有量が
２及至８重量％で、メルトフローレートが２．５ｇ／１
０分以上で且つ重量平均分子量と数平均分子量との比が
３及至５のエチレン−プロピレン・ランダム共重合体か
ら成ることを特徴とする表面光沢性に優れた多層プラス
チック容器」である。However, all of the above methods require strict conditions and complicated molding equipment.
When the claims of JP-A-2-215529 are cited, "In a multilayer plastic container having a structure in which two or more resin layers are laminated, the outermost surface layer has an ethylene content of 2 to 8% by weight, Melt flow rate is 2.5g / 1
It is a multi-layer plastic container having an excellent surface gloss, characterized by comprising an ethylene-propylene random copolymer having a weight average molecular weight to a number average molecular weight of 3 to 5 for 0 minutes or more. "
【０００５】しかし、このような樹脂ではパリソンの押
出が困難であり、スムーズな表面を備えたパリソン型へ
の押出を可能にするためには、樹脂中の溶融ムラを防止
する必要があり、温度変化や圧力変動をきわめて厳格に
抑える必要がある。However, it is difficult to extrude a parison with such a resin, and in order to enable extrusion into a parison mold having a smooth surface, it is necessary to prevent uneven melting in the resin, It is necessary to control changes and pressure fluctuations very strictly.
【０００６】また、特公平３−３２４５３号が開示して
いる容器は、「少なくとも外表面の部分がメルトインデ
ックス(ＡＳＴＭ Ｄ １２３８）が２．０ｇ／１０分
以下で、重量平均分子量と数平均分子量との比が３．５
以下のポリプロピレンから形成され、該表面は０．７μ
以下の粗度を有し、且つ容器壁が、下記式 ｙ≦４０ｘ＋５ ｘ≧０．１ 式中、ｘはポリプロピレンから成る器壁部分の厚み（ｍ
ｍ）であり、ｙは該器壁部分の曇度（ヘイズ、％）を表
すを満足する透明性を有することを特徴とする中空成形
容器」である。The container disclosed in Japanese Examined Patent Publication No. 3-32453 describes that "at least the outer surface portion has a melt index (ASTM D 1238) of 2.0 g / 10 minutes or less, a weight average molecular weight and a number average molecular weight. Ratio with 3.5
Formed from the following polypropylene, the surface of which is 0.7μ
The container wall has the following roughness and the container wall has the following formula y ≦ 40x + 5 x ≧ 0.1, where x is the thickness (m of the container wall portion made of polypropylene.
m), and y is a hollow molded container characterized by having transparency satisfying the haze (haze,%) of the vessel wall portion.
【０００７】この容器は、「メルトインデックスが２．
０ｇ／１０分以下で、重量平均分子量と数平均分子量と
の比が３．５以下のポリプロピレンを、混練タイプスク
リューを介して溶融混練し、ダイス素材にクロムメッキ
しポリテトラフルオロエチレンを部分的に埋め込んだ複
合皮膜が多段に設けられ、少なくとも出口近傍の表面の
摩擦係数が０．１５よりも小さいダイスを通して押し出
すことにより、少なくとも外表面がポリプロピレンから
成るパリソンを成形し、該パリソンを割型内で空中成形
することを特徴とする中空成形容器の製造法」により実
現される。This container has a "melt index of 2.
Polypropylene having a weight average molecular weight and a number average molecular weight of 3.5 or less at 0 g / 10 minutes or less is melt-kneaded through a kneading type screw, and the die material is chromium-plated to partially polytetrafluoroethylene. The embedded composite film is provided in multiple stages, and at least the surface near the outlet is extruded through a die having a coefficient of friction smaller than 0.15 to form a parison of which at least the outer surface is made of polypropylene. It is realized by a method for producing a hollow molded container characterized by being molded in air.
【０００８】この容器の製造に際しては、材料樹脂を混
練タイプのスクリューを介して溶融混練を行うことが必
要であるが、分子量分布の狭いポリプロピレンのパリソ
ンの押出は困難であることから、上述のように摩擦係数
の小さい特殊なダイスを通して押出すことが要求され
る。In the production of this container, it is necessary to melt-knead the material resin through a kneading type screw, but it is difficult to extrude polypropylene parison having a narrow molecular weight distribution. It is required to extrude through a special die with a small friction coefficient.
【０００９】以上のように、従来知られている方法で表
面光沢性の優れた合成樹脂容器を成形するには、材料と
して厳格な条件、複雑な製造法が必要であった。本発明
は、従来のものよりも緩和された条件で、簡便に製造す
ることが可能な表面光沢性の優れた合成樹脂容器を提供
しようとするものである。As described above, in order to mold a synthetic resin container having excellent surface gloss by a conventionally known method, strict conditions as a material and a complicated manufacturing method are required. The present invention is intended to provide a synthetic resin container having excellent surface gloss which can be easily manufactured under conditions relaxed as compared with the conventional one.
【００１０】[0010]
【課題を解決するための手段】本発明は、上記課題を解
決するため、合成樹脂容器を、低密度ポリエチレンを５
〜２０重量％含む透明なポリプロピレンから形成される
外層と、ポリプロピレンにより形成される内層とを積層
し、多層容器として構成することとした。In order to solve the above-mentioned problems, the present invention uses a synthetic resin container containing low-density polyethylene.
An outer layer made of transparent polypropylene containing about 20 wt% and an inner layer made of polypropylene are laminated to form a multi-layer container.
【００１１】以下、本発明をさらに詳しく説明する。本
発明による多層容器は透明な外層、及び内層からなる２
重壁構造を有する（図１）。The present invention will be described in more detail below. The multi-layer container according to the present invention comprises a transparent outer layer and an inner layer.
It has a heavy wall structure (Fig. 1).
【００１２】ポリプロピレンにより成形される内層の外
側に、透明な外層を設けることによって照射光の乱反射
を防ぎ、さらにポリプロピレンよりも光沢性のよい低密
度ポリエチレンを外層に配合することにより優れた表面
光沢性を得ることができる。By providing a transparent outer layer on the outer side of the inner layer formed of polypropylene, diffuse reflection of irradiation light is prevented, and by blending low density polyethylene having a better gloss than polypropylene in the outer layer, excellent surface gloss is obtained. Can be obtained.
【0013】外層は低密度ポリエチレンを５〜２０重量％、
好ましくは１０重量％含む透明なポリプロピレンにより
形成される。[0013] The outer layer is 5 to 20% by weight of low-density polyethylene,
It is preferably made of transparent polypropylene containing 10% by weight.
【００１４】内層はポリプロピレンにより成形される。
着色効果を出すために着色顔料を配合することができ、
その場合には１重量％程度配合するのが好ましく、色に
より適宜変える。The inner layer is formed of polypropylene.
A coloring pigment can be added to produce a coloring effect,
In that case, it is preferable to add about 1% by weight, and it may be changed depending on the color.
【００１５】外層の厚さとしては、２０〜１００μｍ、
好ましくは３０μｍが採用される。外層と内層の厚さの
比は１：１５〜１：２０であることが好ましい。外層が
厚すぎると透明性が悪くなり、表面光沢性あるいは内層
の発色が劣るので上記範囲が好ましい。The thickness of the outer layer is 20 to 100 μm,
30 μm is preferably adopted. The thickness ratio of the outer layer to the inner layer is preferably 1:15 to 1:20. If the outer layer is too thick, the transparency will be poor and the surface gloss or the color development of the inner layer will be poor, so the above range is preferred.
【００１６】[0016]
【実施例】本発明の一実施例を説明する。外層に、１０
重量％の低密度ポリエチレンを含む原色のポリプロピレ
ン（メルトフローレート：１．８ｇ／１０分）を、内層
に９００μｍ程度の着色顔料を１．０重量％含む原色の
ポリプロピレン（メルトフローレート：０．７３ｇ／１
０分）を使用し、以下に示す共押出成形により一体に成
形した。EXAMPLE An example of the present invention will be described. 10 on the outer layer
Primary color polypropylene (wt. Flow rate: 1.8 g / 10 min) containing wt% low density polyethylene, and primary color polypropylene (melt flow rate: 0.73 g) containing 1.0 wt% of coloring pigment of about 900 μm in the inner layer. / 1
0 min) was used to integrally form the following coextrusion molding.
【００１７】上記材料を各々の押出機に供給し、２層溶
融パリソンを押出し、このパリソンをブロー成形機のブ
ロー金型内でブロー成形し、胴部平均肉圧１０００μ
ｍ、内容積７４０ｍｌのボトルを得た。The above materials are supplied to each extruder, two-layer molten parison is extruded, and this parison is blow-molded in a blow mold of a blow-molding machine to obtain an average wall thickness of the body of 1000 μm.
m, and an internal volume of 740 ml was obtained.
【００１８】光沢度を、ＪＩＳ Ｚ７１０５の方法で入
射角６０度で測定したところ、従来の２層構造のボトル
（特公昭５３−４１５９６に記載の方法による。）では
４７であったのに対し、本発明による２層構造のボトル
の光沢度は６８であった。When the glossiness was measured by the method of JIS Z7105 at an incident angle of 60 degrees, it was 47 in the conventional two-layer structure bottle (according to the method described in JP-B-53-41596). The gloss of the two-layer bottle according to the present invention was 68.
【００１９】[0019]
【発明の効果】以上のように、本発明による多層容器
は、従来品より格段に表面光沢性において優れている。
さらに、この容器は材料に特殊な樹脂を用いることな
く、簡便に製造することができる。INDUSTRIAL APPLICABILITY As described above, the multilayer container according to the present invention is remarkably superior in surface gloss to conventional products.
Further, this container can be easily manufactured without using a special resin as a material.
【図１】本発明の一実施例を示すボトルの一部破断正面
図FIG. 1 is a partially cutaway front view of a bottle showing an embodiment of the present invention.
１・・・・・・本体、２・・・・・・内層、３・・・・・・外層 1 ... Main body, 2 ... Inner layer, 3 ... Outer layer
Claims (2)
含む透明なポリプロピレンから形成される外層と、ポリ
プロピレンより形成される内層とを積層してなる多層容
器。1. A multi-layer container in which an outer layer made of transparent polypropylene containing 5 to 20% by weight of low-density polyethylene and an inner layer made of polypropylene are laminated.
１：２０であることを特徴とする請求項１記載の多層容
器。2. The thickness ratio of the outer layer to the inner layer is from 1:15.
It is 1:20, The multilayer container of Claim 1 characterized by the above-mentioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24991391A JP3457337B2 (en) | 1991-09-27 | 1991-09-27 | Multilayer container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24991391A JP3457337B2 (en) | 1991-09-27 | 1991-09-27 | Multilayer container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0584877A true JPH0584877A (en) | 1993-04-06 |
| JP3457337B2 JP3457337B2 (en) | 2003-10-14 |
Family
ID=17200059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24991391A Expired - Fee Related JP3457337B2 (en) | 1991-09-27 | 1991-09-27 | Multilayer container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3457337B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102107601B1 (en) * | 2015-02-13 | 2020-05-07 | 주식회사 정민 | Dual cosmetic vessel |
-
1991
- 1991-09-27 JP JP24991391A patent/JP3457337B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3457337B2 (en) | 2003-10-14 |
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