JPH0624431A - Container made by multilayer blow molding, and manufacture thereof - Google Patents
Container made by multilayer blow molding, and manufacture thereofInfo
- Publication number
- JPH0624431A JPH0624431A JP26898191A JP26898191A JPH0624431A JP H0624431 A JPH0624431 A JP H0624431A JP 26898191 A JP26898191 A JP 26898191A JP 26898191 A JP26898191 A JP 26898191A JP H0624431 A JPH0624431 A JP H0624431A
- Authority
- JP
- Japan
- Prior art keywords
- container
- parison
- surface layer
- layer
- width
- 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
- 238000000071 blow moulding Methods 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000010410 layer Substances 0.000 claims abstract description 113
- 239000002344 surface layer Substances 0.000 claims abstract description 45
- 229920003023 plastic Polymers 0.000 claims abstract description 14
- 239000004033 plastic Substances 0.000 claims abstract description 14
- 229920000098 polyolefin Polymers 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 8
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 6
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 6
- 238000007127 saponification reaction Methods 0.000 claims description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 4
- 239000005977 Ethylene Substances 0.000 claims description 4
- 229920002126 Acrylic acid copolymer Polymers 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- KUKFKAPJCRZILJ-UHFFFAOYSA-N prop-2-enenitrile;prop-2-enoic acid Chemical compound C=CC#N.OC(=O)C=C KUKFKAPJCRZILJ-UHFFFAOYSA-N 0.000 claims description 3
- 229920003188 Nylon 3 Polymers 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 230000004888 barrier function Effects 0.000 description 10
- 239000012790 adhesive layer Substances 0.000 description 7
- 229920000642 polymer Polymers 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- -1 polyethylene Polymers 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229920002292 Nylon 6 Polymers 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- FEXBEKLLSUWSIM-UHFFFAOYSA-N 2-Butyl-4-methylphenol Chemical compound CCCCC1=CC(C)=CC=C1O FEXBEKLLSUWSIM-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
- B29C49/4817—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity with means for closing off parison ends
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
- B65D1/0215—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features multilayered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Laminated Bodies (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【0001】本発明は、プラスチック製の多層ブロー成
形容器及びその製法に関し、より詳細には、底部にピン
チオフにより成形された接合部を備えた多層ブロー成形
容器において、該接合部で多層構造の各同一層同士が実
質的に連続しており、多層構造の利点である、例えば、
耐酸素透過性、耐湿性、耐有機溶剤性、耐薬品性、機械
的強度性等が、ピンチオフ接合部においても優れている
容器とその製法に関するものである。The present invention relates to a multi-layer blow-molded container made of plastic and a method for producing the same, and more particularly to a multi-layer blow-molded container having a joint formed by pinch-off at the bottom thereof, wherein each joint has a multi-layer structure. The same layers are substantially continuous, which is an advantage of the multi-layer structure, for example,
The present invention relates to a container excellent in oxygen permeation resistance, moisture resistance, organic solvent resistance, chemical resistance, mechanical strength and the like even in a pinch-off joint portion, and a manufacturing method thereof.
【0002】[0002]
【従来の技術】従来からプラスチック多層構造の多層成
形容器が、各層の独自の特性を兼ね備えた容器として優
れていることは知られているが、底部にピンチオフによ
り成形された接合部を備えた多層ブロー成形容器におい
て、該接合部で多層構造の各同一層同士を連続させ、接
合部においても多層構造の利点である、耐酸素透過性、
耐湿性、耐有機溶剤性、耐薬品性、機械的強度性等を維
持せしめた容器とその製法には困難が伴うものであっ
た。この種の容器とその製法に関しては、これまで種々
の提案があるが、本発明に関しては、特に特許出願公告
昭53−15432号公報と特許出願公開昭59−11
5234号公報に記載のものを従来の技術として挙げる
ことができる。2. Description of the Related Art Conventionally, it has been known that a multi-layer molded container having a plastic multi-layer structure is excellent as a container having the unique characteristics of each layer, but a multi-layer container having a joint formed by pinch-off at the bottom. In a blow-molded container, the same layer of the multilayer structure is continuous at the joint, and the oxygen permeation resistance, which is an advantage of the multilayer structure at the joint,
Difficulty is involved in a container that maintains moisture resistance, organic solvent resistance, chemical resistance, mechanical strength, and the like and its manufacturing method. Although various proposals have been made so far regarding this type of container and a method for producing the same, the present invention is particularly concerned with Japanese Patent Application Publication No. 53-15432 and Japanese Patent Application Publication No. 59-11.
The technique described in Japanese Patent No. 5234 can be cited as a conventional technique.
【0003】前者公報記載の容器とその製法は、それ事
態は従来周知のポリオレフィンからなる内外表面層と、
同じくそれ自体従来周知の特定の酸素バリヤー性を有す
る中間層とを容器壁とする管状パリソンの底部ピンチオ
フ接合部を、それ自体従来周知の容器壁から外方に突出
した先細り部を有する突条に形成して、該接合部におい
て各同一層同士を実質的に面で連続させるものであり、
その組合せの妙をもって特許性があると認められたもの
であるが、特に、ピンチオフ接合部を、例えばV字型、
U字型、半円状、半楕円状、富士山型、UとV字の組合
せ型等の先細り状に形成して各同一層同士を連続させる
点に最大の特徴を有し、平面状や矩形状では各同一層同
士が連続しないと排除されており、その理由は解明され
ていないが、この理由を、先細り部を有する凹溝の割型
を用いると、容器底部のピンチオフ部分のうち突条の横
断面幅の最も狭い部分から先に圧力がかかり始め、割型
に接触している容器外層の厚みが割型の先細り部分の幅
よりも大きいので、中間層の実質的部分が積層の内部に
とどまって、容器の性能に影響を及ぼすような中間層の
外部への露呈が生じないものかと考えている、と説明さ
れている。The container described in the former publication and the manufacturing method thereof are as follows: the inner and outer surface layers made of a known polyolefin.
Similarly, the bottom pinch-off joint of the tubular parison, which has a container wall having an intermediate layer having a specific oxygen barrier property, which is also known per se, is formed into a ridge having a tapered portion outwardly protruding from the container wall, which is known per se. Is formed to make the same layers substantially continuous with each other at the joint,
It is recognized that the combination is unique and patentable, but in particular, the pinch-off joint part is, for example, V-shaped,
U-shaped, semi-circular, semi-elliptical, Mt. Fuji-shaped, U- and V-shaped, etc. are formed in a taper shape, and the greatest feature is that the same layers are connected to each other. In the shape, it is excluded that the same layers are not continuous, and the reason for this has not been clarified.The reason for this is that if a split mold with a concave groove having a tapered portion is used, the protrusion of the pinch-off portion at the bottom of the container is used. The pressure starts to be applied from the narrowest part of the cross-sectional width of the container, and the thickness of the outer layer of the container that is in contact with the split mold is larger than the width of the tapered part of the split mold. It is explained that the exposure of the intermediate layer to the outside that affects the performance of the container does not occur.
【0004】後者公報に記載の多層容器は、ポリオレフ
ィン等の主体層とエチレン−酢酸ビニル共重合体ケン化
物等の耐気体透過層との少なくとも二層以上の積層され
た多層パリソンを分割形式の金型で挟み中空成形するこ
とにより、該多層パリソンが金型に挟まれ形成されたピ
ンチオフ部分にリブを形成してなる多層容器において、
該リブの両側面は基端から先端に向かって拡開するよう
傾斜状に構成し、先端の幅は基端の幅の1.1 から5倍、
リブの高さは基端の幅の0.5 倍から5倍に構成したこと
を特徴とし、リブの形状の寸法比のみにその記載は限ら
れ、容器壁の層構成には言及しているが、容器壁の肉厚
に対するリブの寸法については全く記載がない。The multi-layer container described in the latter publication has a multi-layer parison in which at least two layers including a main layer such as a polyolefin and a gas permeation resistant layer such as a saponified product of ethylene-vinyl acetate copolymer are laminated. In a multi-layer container in which a rib is formed in a pinch-off portion formed by sandwiching the multi-layer parison in a mold by sandwiching with a mold and performing hollow molding,
Both side surfaces of the rib are formed in an inclined shape so as to expand from the base end toward the tip, and the width of the tip is 1.1 to 5 times the width of the base end,
The height of the rib is characterized by being 0.5 to 5 times the width of the base end, and the description is limited only to the dimensional ratio of the shape of the rib, and refers to the layer structure of the container wall, There is no mention of the rib size relative to the wall thickness of the container.
【0005】[0005]
【発明が解決しようとする問題点】前記特許出願公告昭
53−15432号公報の記載によれば、ピンチオフ接
合部を、例えば、V字型、U字型、半円状、半楕円状、
富士山型、UとV字の組合せ型等の任意の先細り状に形
成して各同一層同士を連続させることができ、平面状や
矩形状では各同一層同士が連続しないとされているが、
発明者が必要に迫られて行った実験によると、当該公報
の記載に相違して、ピンチオフ接合部を先細り状に形成
したのでは各同一層同士を完全に連続させることが困難
であり、返って、容器壁の肉厚にたいして特定の寸法で
ではあるが、ピンチオフ接合部を突状部基部に絞り幅部
を有する矩形状に形成すると、確実に各同一層同士が連
続するという知見を得るに至った。即ち、ピンチオフ接
合部を先細り状に形成して各同一層同士を連続させよう
としても、実際に連続させることができるのは、接合部
を長手方向に見て、その中央部付近(即ち底部中央付
近)であって接合部の両端部付近(即ち底部両側付近)
では、中間層が外表面層に露呈してしまう問題があっ
た。According to the description of the above-mentioned Japanese Patent Application Publication No. 53-15432, pinch-off joints are formed in, for example, V-shape, U-shape, semicircle, semi-ellipse,
It is possible to form the taper into an arbitrary tapered shape such as a Mt. Fuji type or a combination of U and V shapes so that the same layers can be continuous with each other. In the planar shape or the rectangular shape, the same layers are not continuous with each other.
According to an experiment conducted by the inventor under the necessity, unlike the description in the publication, it is difficult to completely connect the same layers to each other by forming the pinch-off junction in a tapered shape. Although it is a specific dimension for the wall thickness of the container wall, if the pinch-off joint is formed in a rectangular shape having a narrowed width portion at the base of the protruding portion, it is possible to obtain the knowledge that the same layers are surely continuous. I arrived. That is, even if the pinch-off joint is formed in a taper shape and the same layers are made continuous, the fact that the joint can be made continuous can be obtained by looking at the joint in the longitudinal direction, that is, near the center (that is, the center of the bottom). Near both ends of the joint (that is, near both sides of the bottom)
Then, there was a problem that the intermediate layer was exposed to the outer surface layer.
【0006】また、前記特許出願公開昭59−1152
34号公報に記載の多層容器は、ピンチオフ部分にリブ
を形成してなる多層容器において、該リブの両側面は基
端から先端に向かって拡開するよう傾斜状に構成し、先
端の幅は基端の幅の1.1 から5倍、リブの高さは基端の
幅の0.5 倍から5倍に構成したことを特徴とするもので
あるが、単にリブの寸法をこのような範囲に規制するだ
けでは、確実に各同一層同士を連続させることができな
い問題があった。即ち、容器壁の肉厚に対して特定の寸
法を持つ多層ブロー成形容器のピンチオフ接合部の割型
の形状Aと、これにより成形されたピンチオフ接合部の
層断面の両端付近B及び中央付近Cを、図5乃至図10
に類型的に示すと、図5の平面状に形成した場合は、前
記公報に記載の通り、中央C、両端Bの接合部の長手方
向全体に渡って中間層1は外表面層2に露出するが、し
かし図6のV字型、図7の逆台形型、及び図8の半円型
の各先細り形状に形成した場合は、中央付近Cでは各層
1、2、3が各同一層同士が連続するものの、両端付近
Bでは中間層1が外表面層2に露呈してしまい、逆に突
状部基部付近に絞り幅部を有する図9の矩形状及び図1
0の台形状に形成した場合は、両端付近Bも中間付近C
も各層の同一層同士が接合部の全体に渡って連続するこ
とが判明した。その理由は、未だ十分に解明されていな
いが、発明者は、この理由を、ピンチオフ接合部を割型
で挟持し、割型内でパリソンを膨張させるとき、接合部
の中央付近(即ち容器底部の中央付近)は、膨張力が主
として接合部の長手方向に直交する方向に働くため、そ
の挟持力を適性に均一に接合部に付与できるのに対し、
接合部の両端付近(即ち容器底部の両端付近)は、膨張
力が接合部の長手方向に沿っても強く作用し、その挟持
力を中央付近に比較して適性に維持できず不均等になる
ために、従来の先細り状の割型では、割型に接する外表
面層が早く若しくは強く引っ張られて先細り頂部付近が
薄くなり、中間層が薄くなった外表面層から露呈するの
ではないか、これに対して、矩形状や台形状のように底
広の割型で挟持する場合には、同じように接合部の両端
付近が膨張力を受けても、挟持したとき割型内に十分な
外表面層が閉じ込められているから、その厚みを維持
し、中間層が外表面層から露呈するのを阻止するのでは
ないかと考えられる。この追実験に基づく知見から、前
記公報に記載の従来の技術では、例えば、ポリオレフィ
ン/バリヤ樹脂/ポリオレフィンからなる多層構造で、
酸素バリヤー性と耐湿性との好ましい組合せを有する容
器であっても、容器底部のピンチオフ接合部においてこ
れら積層物中の各同一層同士が完全に連続し得ないこと
となるから、この不連続部分での酸素バリヤー性や耐湿
性が失われ、更に接合部が落下衝撃等により剥離すると
いう欠点を避け得ないと言わざるを得ない。Further, the above-mentioned patent application publication Sho 59-1152
The multilayer container described in JP-A-34-34 is a multilayer container in which a rib is formed in a pinch-off portion, and both side surfaces of the rib are formed in an inclined shape so as to expand from the base end toward the tip, and the width of the tip is The feature is that the width of the base end is 1.1 to 5 times and the height of the rib is 0.5 to 5 times the width of the base end, but the size of the rib is simply restricted to such a range. However, there is a problem that the same layers cannot be surely continuous with each other. That is, the shape A of the split mold of the pinch-off joint portion of the multilayer blow molding container having a specific dimension with respect to the wall thickness of the container wall, and the vicinity B and the center C of the layer cross-section of the pinch-off joint portion molded by this. 5 to FIG.
As shown in FIG. 5, in the case of the planar shape shown in FIG. 5, the intermediate layer 1 is exposed to the outer surface layer 2 over the entire longitudinal direction of the joint portion of the center C and both ends B as described in the above publication. However, in the case of forming the taper shape of the V-shape of FIG. 6, the inverted trapezoidal shape of FIG. 7, and the semicircular shape of FIG. However, the intermediate layer 1 is exposed to the outer surface layer 2 in the vicinity of both ends B, and conversely, the rectangular shape of FIG.
When it is formed in a trapezoidal shape of 0, both ends B and middle C
It was also found that the same layers of each layer were continuous over the entire joint. The reason for this has not been fully clarified yet, but the inventor has found that the reason for this is that when the pinch-off joint is sandwiched between split molds and the parison is expanded in the split molds, the vicinity of the center of the joint (that is, the bottom of the container). In the vicinity of the center), the expansion force mainly acts in the direction orthogonal to the longitudinal direction of the joint, so that the clamping force can be appropriately and uniformly applied to the joint.
In the vicinity of both ends of the joint (that is, in the vicinity of both ends of the container bottom), the expansion force acts strongly even along the longitudinal direction of the joint, and the clamping force cannot be maintained appropriately compared with the vicinity of the center and becomes uneven. Therefore, in the conventional tapered split mold, the outer surface layer in contact with the split mold is pulled quickly or strongly and the vicinity of the tapered top becomes thin, and the intermediate layer may be exposed from the thin outer surface layer, On the other hand, when sandwiching with a split mold with a wide bottom such as a rectangular shape or a trapezoidal shape, even if both ends of the joint are subjected to expansive force in the same way, when sandwiched, there is sufficient space in the split mold. Since the outer surface layer is confined, it is thought that it may maintain its thickness and prevent the intermediate layer from being exposed from the outer surface layer. From the knowledge based on this additional experiment, in the conventional technique described in the above publication, for example, a multilayer structure of polyolefin / barrier resin / polyolefin,
Even in the case of a container having a preferable combination of oxygen barrier property and moisture resistance, since the same layers in these laminates cannot be completely continuous at the pinch-off joint at the bottom of the container, this discontinuous portion It is unavoidable that the oxygen barrier property and the moisture resistance are lost and that the joint part is peeled off by a drop impact or the like.
【0007】[0007]
【問題点を解決するための手段】そこで、本発明は、プ
ラスチックの管状パリソンのブロー成形により形成され
た内表面層、中間層及び外表面層の少なくとも三層を含
む多層成形された容器壁からなり且つ少なくとも底部に
前記パリソンのピンチオフにより形成された接合部を備
えたプラスチック容器において、前記接合部は容器壁の
厚さ方向外方に突出した突状部を形成し、且つ該突状部
が突出基部付近の絞り幅部に対して略同等若しくはそれ
以上の肉厚部を突出先端部方向に具備し、且つ、突状部
の突出高さH、前記絞り幅部の幅D1及び肉厚部の幅D
2が、成形後の容器壁の肉厚tに対して、SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a multi-layer molded container wall comprising at least three layers, an inner surface layer, an intermediate layer and an outer surface layer formed by blow molding a plastic tubular parison. And a plastic container having a joint formed by pinch-off of the parison at least on the bottom, the joint forms a protrusion protruding outward in the thickness direction of the container wall, and the protrusion is A thick portion approximately equal to or thicker than the narrow portion near the projecting base is provided in the projecting tip portion direction, and the projecting height H of the projecting portion, the width D1 of the narrow width portion, and the thick portion. Width D
2 is the thickness t of the container wall after molding,
【数1】[Equation 1]
【数2】[Equation 2]
【数3】の関係にあり、これにより容器壁を構成する各
同一層同士が前記接合部において面で連続していること
を特徴とする多層ブロー成形容器を提供すると共に、内
表面層、中間層及び外表面層の少なくとも三層を含む多
層構造のプラスチックパリソンを同時溶融押出により成
形し、溶融押出された前記パリソンを、型を合わせたと
きに溶断部に外向きに基部付近の絞り幅部と該絞り幅部
を同等若しくはそれ以上の肉厚部を先端部方向に有する
凹溝が形成される一対の割型で挟み、且つ該凹溝の深さ
H、前記絞り幅部の幅D1及び肉厚部の幅D2が、成形
後の容器壁の肉厚tに対して、There is provided a multi-layer blow molding container characterized in that the same layers constituting the container wall are continuous in the surface at the joint portion, as well as the inner surface layer and the intermediate layer. Layers and an outer surface layer of a multi-layered plastic parison including at least three layers are formed by simultaneous melt extrusion, and the melt extruded parison is outwardly squeezed to the fusing part when the molds are fitted, and the narrowed width part near the base part. And the narrowed width portion is sandwiched by a pair of split dies having a groove having the same or greater wall thickness portion in the front end direction, and the depth H of the concave groove, the width D1 of the narrowed width portion, and The width D2 of the thick portion is relative to the wall thickness t of the container wall after molding,
【数1】[Equation 1]
【数2】[Equation 2]
【数3】の関係にあり、次いでこのパリソンを割型内で
膨張させ、これによりパリソン接合部に外方に前記凹溝
に対応する突状部を形成して、パリソン中の内表面層、
中間層及び外表面層の各同一層同士が前記接合部におい
て面で連続させることを特徴とするプラスチック製の多
層ブロー成形容器の製法を提供するものである。Then, the parison is expanded in the split mold, thereby forming a protrusion on the parison joint outwardly corresponding to the concave groove, thereby forming an inner surface layer in the parison,
The present invention provides a method for producing a multi-layer blow-molded container made of plastic, characterized in that the same layer of the intermediate layer and the outer surface layer are continuous in the joint at the surface.
【0008】ここで、本発明で、容器壁の厚さ方向外方
に突出した突状部の突出基部付近の絞り幅部とは、この
容器底部の管状パリソンのピンチオフ接合部において、
容器壁が重なり合う部分に絞りを加えた幅であるから、
容器壁の肉厚をtとすれば、理論的には、容器壁が重な
り合う部分の肉厚は2tとなり、従って、この肉厚2t
に絞りを加えた前記絞り幅部は2t以下の間隔になる。
しかし、確実には1.4t程度以下の間隔で絞り効果が
認められ、最適条件としては、後述するように、この絞
り幅部の間隔は0.3t〜1.2t程度であり、0.2
5t程度以下では絞り過ぎになる。その理由は、接合時
に容器壁が溶融状態にあるから、ある程度の絞りを加え
ないと、十分な絞り効果が上がらないためかと考えられ
る。突出高さH及び広がり幅D2の容器壁肉厚tに対す
る条件も同様に絞り効果に影響をあたえるからと考えら
れる。また、パリソン中の内表面層、中間層及び外表面
層の各重合体層の間に接着性がない場合には、互いに隣
接する2層の間に、この2種の重合体を含有するブレン
ド層を接着剤として設け、各層間の剥離強度を向上させ
ることができる。Here, in the present invention, the narrowed width portion in the vicinity of the projecting base portion of the projecting portion projecting outward in the thickness direction of the container wall means the pinch-off joint portion of the tubular parison at the bottom portion of the container.
Because the width of the container wall is a squeezed part that overlaps,
If the wall thickness of the container wall is t, theoretically, the wall thickness of the portion where the container walls overlap is 2t. Therefore, this wall thickness 2t
The width of the diaphragm obtained by adding a diaphragm is 2t or less.
However, the diaphragm effect is surely recognized at an interval of about 1.4t or less, and the optimum condition is that the interval of the diaphragm width portion is about 0.3t to 1.2t, which will be described later.
If it is less than about 5t, the aperture will be too narrow. It is considered that the reason is that the container wall is in a molten state at the time of joining, so that a sufficient throttling effect cannot be achieved unless a certain degree of throttling is applied. It is considered that the conditions for the projection height H and the spread width D2 with respect to the wall thickness t of the container similarly affect the drawing effect. Further, when there is no adhesiveness between the polymer layers of the inner surface layer, the intermediate layer and the outer surface layer in the parison, a blend containing the two types of polymers between two layers adjacent to each other. The layers can be provided as an adhesive to improve the peel strength between the layers.
【0009】[0009]
【作用】本発明では、内表面層、中間層及び外表面層の
少なくとも三層を含む多層成形された多層ブロー成形容
器が、その底部のピンチオフ接合部において、容器壁の
厚さ方向外方に突出した突状部を形成し、且つ該突状部
が容器壁の肉厚に対して特定の範囲において、突出基部
付近の絞り幅部に対して略同等若しくはそれ以上の肉厚
部を突出先端部方向に具備し、これにより容器壁を構成
する各同一層同士が前記接合部の全体において実質的に
完全に面で連続しているから、内外表面層を、耐湿性や
非透水性、及び強靭性に優れたポリエチレン等で構成
し、中間層を高湿条件に弱いが通常では優れた酸素バリ
ヤー性を有する気体バリヤー樹脂で構成すれば、本発明
の他方ブロー成形容器は、そのピンチオフ接合部の全域
において、周囲の容器壁と実質的に同様に各同一層同士
が面で連続して、各層固有の特性を相乗的に発揮し、酸
素、水蒸気、炭酸ガス等の各種気体や、水、有機液体、
アンモニア水、塩酸等の各種液体に対して優れたバリヤ
ー性を示し、更に接合部は容器壁より全体に渡って肉厚
に形成されることとなるから強度的にも安定し、内容物
を充填した状態でも落下の衝撃にも十分耐え得る優れた
強度乃至耐剥離性を具備することとなる。本発明におい
て、多層ブロー成形容器の接合部に、突出基部付近の絞
り幅部に対して略同等若しくはそれ以上の肉厚部を突出
先端部方向に具備する突状部を形成するためには、溶融
押出されたパリソンを、型を合わせたときに溶断部に、
突出基部付近の絞り幅部に対して略同等若しくはそれ以
上の肉厚部を突出先端部方向に具備する凹溝が形成され
た一対の割型で挟み、次いでこのパリソンを割型内で膨
張されることで容易に成形することができる。According to the present invention, a multilayer blow molded container having a multilayer structure including at least three layers of an inner surface layer, an intermediate layer and an outer surface layer is provided at a pinch-off joint at the bottom thereof outward in the thickness direction of the container wall. A projecting protruding portion is formed, and in a specific range with respect to the wall thickness of the container wall, the projecting protruding portion has a thick portion that is approximately equal to or thicker than the narrowed width portion near the projecting base portion. Since it is provided in the part direction, each of the same layers constituting the container wall is substantially completely continuous in the entire joint portion, the inner and outer surface layers are provided with moisture resistance and water impermeability, and If the intermediate layer is made of polyethylene or the like having excellent toughness and the intermediate layer is made of a gas barrier resin which is weak in high humidity conditions but normally has excellent oxygen barrier property, the other blow molding container of the present invention has the pinch-off joint portion. Of the surrounding area Walls in substantially the same manner as the same layer with each other continuously in the plane, synergistically exert layers specific characteristics, oxygen, water vapor, and various gases such as carbon dioxide, water, organic liquids,
It has excellent barrier properties against various liquids such as ammonia water and hydrochloric acid, and since the joint is formed thicker than the entire wall of the container, it is stable in strength and fills the contents. It has excellent strength and peeling resistance enough to withstand the impact of a drop even in the above state. In the present invention, in the joint portion of the multilayer blow-molded container, in order to form a protrusion having a wall thickness portion approximately equal to or greater than the drawing width portion in the vicinity of the protrusion base in the protrusion tip end direction, The melt-extruded parison is used as a fusing part when the molds are matched,
The parison is sandwiched between a pair of split molds with a groove formed in the direction of the projecting tip, which is thicker than or equal to the width of the narrowed portion near the projection base, and then expanded in the split mold. By doing so, it can be easily molded.
【0010】[0010]
【実施例】本発明では、内外表面層を、耐湿性や非透水
性、及び強靭性に優れたポリエチレン、アイソタクティ
ック・ポリプロピレン、エチレン−プロピレン共重合
体、ポリプテン−1、ポリペンテン−1等のポリオレフ
ィンで構成することができ、中間層を優れた酸素バリヤ
ー性を有するエチレン含有量が25乃至75モル%でケ
ン化度が少なくとも93%のエチレン−酢酸ビニル共重
合体ケン化物、アリクロニトリル−アクリル酸共重合
体、或いはポリアミド等から構成することができ、その
結果として本発明多層ブロー成形容器は、内容物を湿気
及び酸素の侵入や漏出から完全に保護することができる
と共に、更に接合部は容器壁より全体に渡って肉厚に形
成されることとなるから強度的にも安定した容器とな
る。中間層の酸素バリヤー樹脂としては、前記エチレン
−酢酸ビニル共重合体ケン化物やアクリロニトリル−ア
クリル酸共重合体の他に、ナイロン6、ナイロン6・
6、ナイロン12等の各種ポリアミドも使用できる。こ
れらの各重合体層の間に接着性がない場合には、隣接す
る各重合体層の少なくとも一方にカルボニル基含有重合
体を0.5乃至15重量%の量で配合したり、或いは前
述の如く互いに隣接する2層の間に、この2種の重合体
を含有するブレンド層を接着剤として設け、各層間の剥
離強度を向上させることができる。EXAMPLES In the present invention, the inner and outer surface layers are made of polyethylene, isotactic polypropylene, ethylene-propylene copolymer, polypten-1, polypentene-1, etc., which are excellent in moisture resistance, water impermeability and toughness. Saponified ethylene-vinyl acetate copolymer having an ethylene content of 25 to 75 mol% and a saponification degree of at least 93%, which can be composed of polyolefin and has excellent oxygen barrier properties, and acrylonitrile-acryl. The multi-layer blow molding container of the present invention, which can be composed of an acid copolymer, polyamide, or the like, as a result, can completely protect the contents from intrusion and leakage of moisture and oxygen, and further has a joint part. Since it is formed to be thick over the entire wall of the container, the container is stable in strength. As the oxygen barrier resin for the intermediate layer, in addition to the saponified ethylene-vinyl acetate copolymer and acrylonitrile-acrylic acid copolymer, nylon 6, nylon 6 and
Various polyamides such as 6 and nylon 12 can also be used. When there is no adhesiveness between these respective polymer layers, at least one of the adjacent polymer layers is blended with a carbonyl group-containing polymer in an amount of 0.5 to 15% by weight, or As described above, a blend layer containing the two kinds of polymers is provided as an adhesive between two layers adjacent to each other, and the peel strength between the layers can be improved.
【0011】本発明のブロー成形工程を第3図及び第4
図で説明すると、複数台の押出機で加熱溶融されて供給
される複数種の重合体からなる多層の溶融樹脂流は、ダ
イ4の環状樹脂通路5を経て、多層構造のパリソン6の
形に溶融押出される。この押出しされたパリソン6の周
囲には一対の割型7、8が往復動可能に設けられてい
る。この一対の割型7、8は型合わせをしたとき、内部
に容器の外形と一致する空間9、10が設けられてお
り、その底部の、型合わせしたときパリソンを挟持し、
且つ溶断するための溶断部11、12には、突出基部付
近の最小幅部に対して略同等若しくはそれ以上の肉厚部
を突出先端部方向に具備する凹溝13が形成されてい
る。この凹溝13の形状及び寸法は前記ブロー成形容器
の接合部における突状部と一致するように設定されてい
る。第3図において、多層構造のパリソン6が所定の寸
法に押出しされると、分割している一対の割型7、8が
矢標方向の型合わせ方向に移動し、第4図に示す通り、
パリソン6を溶断部11、12で挟持すると共に溶断
し、これと共にパリソン内部に圧縮空気吹き込み口14
を通して圧縮空気が吹き込まれ、ブロー成形容器15と
なる。このとき、割型7、8の溶断部に形成された凹溝
13に対応して、ブロー成形容器15の接合部には、突
出基部付近の絞り幅部に対して略同等若しくはそれ以上
の肉厚部を突出先端部方向に具備する突状部16が形成
されることとなる。The blow molding process of the present invention will be described with reference to FIGS. 3 and 4.
Explaining in the figure, a multi-layered molten resin flow composed of a plurality of types of polymers heated and melted by a plurality of extruders passes through an annular resin passage 5 of a die 4 to form a multi-layered parison 6. It is melt extruded. Around the extruded parison 6, a pair of split dies 7 and 8 are reciprocally provided. The pair of split molds 7 and 8 are provided with spaces 9 and 10 that match the outer shape of the container when the molds are matched, and the parison at the bottom of the molds is sandwiched when the molds are matched.
In addition, the fusing parts 11 and 12 for fusing are formed with a concave groove 13 having a wall thickness portion approximately equal to or larger than the minimum width portion near the protruding base portion in the protruding tip end direction. The shape and size of the concave groove 13 are set so as to match the protruding portion in the joint portion of the blow molding container. In FIG. 3, when the multi-layered parison 6 is extruded to a predetermined size, the pair of split molds 7 and 8 move in the die-matching direction of the arrow mark direction, as shown in FIG.
The parison 6 is sandwiched between the fusing parts 11 and 12 and melted, and together with this, the compressed air blowing port 14 is placed inside the parison.
Compressed air is blown through to form the blow-molded container 15. At this time, corresponding to the concave groove 13 formed in the fusing part of the split molds 7 and 8, the joint of the blow-molded container 15 has a thickness approximately equal to or larger than that of the drawing width part near the protruding base part. The protruding portion 16 having the thick portion in the protruding tip portion direction is formed.
【0012】[0012]
【成形例】 内外表面層用として、密度(JIS−K−676
0)が0.949g/cm3 ,メルトフローインデック
ス(JIS−K−6760)が0.30g/10min の
高密度ポリエチレン99重量%に、着色剤として1重量
%の酸化チタン(IV)(アナターゼ型及びルチル型を
1:1重量比で混合したもの)、 中間層用として、密度(ASTM−D−1505)
が1.188g/cm3,メルトフローインデックス(A
STM−D−1238)が1.30g/10min 、エチ
レン含有量が32モル%、ケン化度が95%以上のエチ
レン−酢酸ビニル共重合体ケン化物を110℃で240
分間乾燥させたもの、 内外表面層と中間層との接着層用として、密度(A
STM−D−1505)が0.901g/cm3 ,メル
トフローインデックス(ASTM−D−1238)が
1.10g/10min 、5モル%のカルボキシル基を導
入させた接着性変性ポリエチレン97重量%に、酸化防
止剤として3重量%のジ−tert.ブチル−p−クレ
ゾールを混合したもの、 をそれぞれの内外表面層用としてスクリュー径35m
m、スクリュー長さ800mm、の中間層用としてス
クリュー径30mm、スクリュー長さ650mm、の
接着層用としてスクリュー径30mm、スクリュー長さ
650mmを有する内外表面層用押出機、中間層用押出
機及び接着層用押出機及び中間層用押出機が三種五層用
五重ダイに連結された共押出機により、後述の温度条件
で共押出を行い、これにより最外層と最内層が前記高密
度ポリエチレン、中間層がエチレン酢酸ビニル共重合体
ケン化物、これらの2種の層を前記の接着性変性ポリエ
チレン層で接着された対称五層型積層構造をなしたパリ
ソンを製造し、ボトル成形に供した。押出機の温度条件
は、内外表面層用押出機では、シリンダー後部温度16
0℃,シリンダー前部温度180℃、中間層用押出機で
は、シリンダー後部温度185℃,シリンダー前部温度
200℃、接着層用押出機では、シリンダー後部温度1
65℃,シリンダー前部温度185℃、三種五層用五重
ダイのダイ温度は190℃であった。尚、成形に使用し
た金型は直径40mm、高さ100mm、内容量100
ccの上げ底のシリンダー状のものであり、金型温度は
15℃であった。[Molding Example] Density (JIS-K-676) for inner and outer surface layers
0) is 0.949 g / cm 3 , and the melt flow index (JIS-K-6760) is 0.30 g / 10 min, to 99% by weight of high-density polyethylene, and 1% by weight of titanium oxide (IV) as a coloring agent (anatase type). And a mixture of rutile type in a weight ratio of 1: 1), for the intermediate layer, density (ASTM-D-1505)
Of 1.188 g / cm 3 , melt flow index (A
STM-D-1238) is 1.30 g / 10 min, ethylene content is 32 mol%, and saponification degree is 95% or more.
After being dried for a minute, for the adhesive layer between the inner and outer surface layers and the intermediate layer, the density (A
STM-D-1505) is 0.901 g / cm 3 , melt flow index (ASTM-D-1238) is 1.10 g / 10 min, and 97% by weight of adhesive modified polyethylene having 5 mol% of a carboxyl group introduced. 3% by weight of di-tert. A mixture of butyl-p-cresol, with a screw diameter of 35 m for each of the inner and outer surface layers
m, screw length 800 mm, screw diameter 30 mm for intermediate layer, screw length 650 mm, screw diameter 30 mm for adhesive layer, screw length 650 mm, inner and outer surface layer extruder, intermediate layer extruder and bonding A layer extruder and an intermediate layer extruder are coextruders connected to a five-layer die for three-kind five layers, coextrusion is performed under the temperature conditions described below, whereby the outermost layer and the innermost layer are the high-density polyethylene, A parison having a symmetrical five-layer type laminated structure in which the intermediate layer was a saponified product of ethylene vinyl acetate copolymer and these two layers were adhered by the above-mentioned adhesive modified polyethylene layer was produced and subjected to bottle molding. The temperature conditions of the extruder are as follows:
0 ° C., cylinder front temperature 180 ° C., middle layer extruder has cylinder rear temperature 185 ° C., cylinder front temperature 200 ° C., adhesive layer extruder has cylinder rear temperature 1
The temperature of the front part of the cylinder was 65 ° C., the temperature of the front part of the cylinder was 185 ° C., and the temperature of the five-layer die for three kinds of five layers was 190 ° C. The mold used for molding has a diameter of 40 mm, a height of 100 mm, and an internal capacity of 100.
It was a cylinder with a raised bottom of cc, and the mold temperature was 15 ° C.
【0013】第1図の実施例では、容器壁の肉厚t=
3.5mmに対して、凹溝13による突出基部付近の絞
り幅部の絞り幅D1=2mm、突出先端部(即ち広がり
幅)D2=3mm、突出高さH=2mm、突状部の立ち
上がり角度θ=68°50’のものと、容器壁の肉厚t
=3.0mmに対して、凹溝13による突出基部付近の
絞り幅部の絞り幅D1=1mm、突出先端部(即ち広が
り幅)D2=3mm、突出高さH=2.0mm、突状部
の立ち上がり角度θ=60°のものを成形し、いずれの
容器においてもピンチオフ接合部の長手方向の全体に渡
って接着層も含めて中間層1、外表面層2及び内表面層
3の各同一層同士が連続する容器が得られた。第2図の
実施例では、容器壁の肉厚t=1.5 mmに対して、突出
基部付近の絞り幅部D1と突出先端部(即ち広がり幅)
D2が等しくD1=D2=1.5 mm、突出高さH=1.
0mm、突状部の立ち上がり角度θ=90°の容器を成
形し、同様にピンチオフ接合部の全体に渡って各同一同
士が連続した容器が得られた。これら接合部における連
続状態は、接合部の長手方向に直交する面で、接合部の
全体に渡って多数箇所で切断し、内外表面層は素材に混
合した着色剤による着色により、中間層は偏光顕微鏡及
び位相差顕微鏡により、各層の連続状態を確認した。ま
た、これら容器を横方向に10等分に輪切りにして、着
色している内外表面層と、前記同様の顕微鏡を使用して
測定した中間層と、それら層間に現れる接着層の夫々の
肉厚を測定した結果、各層の肉厚の平均比は、 外表面層:接着層:中間層:接着層:内表面層 = 4
0: 5 : 10:5 : 40 であった。また、容器の重量の平均値は14gであっ
た。その他、種々の条件で成形した結果から、In the embodiment shown in FIG. 1, the wall thickness t of the container is t =
With respect to 3.5 mm, the narrowing width D1 of the narrowing portion near the projecting base portion by the groove 13 is D1 = 2 mm, the projecting tip portion (that is, the spreading width) D2 = 3 mm, the projecting height H = 2 mm, and the rising angle of the projecting portion. θ = 68 ° 50 'and container wall thickness t
= 3.0 mm, the narrowing width D1 of the narrowing width portion near the protruding base portion by the groove 13 is D1 = 1 mm, the protruding tip portion (that is, the spread width) D2 = 3 mm, the protruding height H = 2.0 mm, and the protruding portion. Of which the rising angle θ = 60 ° was molded, and the intermediate layer 1, the outer surface layer 2 and the inner surface layer 3 including the adhesive layer were formed over the entire longitudinal direction of the pinch-off joint in any container. A container having one continuous layer was obtained. In the embodiment of FIG. 2, for the wall thickness t = 1.5 mm of the container wall, the narrowing width portion D1 near the protruding base portion and the protruding tip portion (that is, the spread width)
D2 is equal, D1 = D2 = 1.5 mm, and protrusion height H = 1.
A container having a diameter of 0 mm and a rising angle θ of the protrusion of 90 ° was molded, and similarly, a container in which the same ones were continuous over the entire pinch-off joint was obtained. The continuous state at these joints is a plane that is orthogonal to the longitudinal direction of the joints, cut at multiple points throughout the joint, and the inner and outer surface layers are colored by the colorant mixed in the material, and the intermediate layer is polarized. The continuous state of each layer was confirmed by a microscope and a phase contrast microscope. In addition, these containers are sliced into 10 equal parts in the lateral direction, the colored inner and outer surface layers, the intermediate layer measured using the same microscope as described above, and the thicknesses of the adhesive layers appearing between the layers. As a result of the measurement, the average ratio of the wall thickness of each layer is: outer surface layer: adhesive layer: middle layer: adhesive layer: inner surface layer = 4
It was 0: 5: 10: 5: 40. The average weight of the container was 14 g. In addition, from the results of molding under various conditions,
【数1】[Equation 1]
【数2】[Equation 2]
【数3】において接合部の連続状態が得られ、特には、In (3), a continuous state of the joint is obtained, and in particular,
【数4】 [Equation 4]
【数5】 [Equation 5]
【数1】の条件で最適な接合部の連続状態が得られると
いう知見を得ることができた。尚、当然のことと思われ
るが、外表面層が極めて薄く中間層が外表面近くに位置
する多層構造では、接合部において中間層が外表面に露
呈し易い傾向が見られた。It was possible to obtain the knowledge that the optimum continuous state of the joint was obtained under the condition of [Equation 1]. It should be understood that, in a multilayer structure in which the outer surface layer is extremely thin and the intermediate layer is located near the outer surface, it is obvious that the intermediate layer tends to be exposed to the outer surface at the joint.
【0014】[0014]
【効果】本発明の多層ブロー成形容器は、そのピンチオ
フ接合部の全域において、周囲の容器壁と実質的に同様
に各同一層同士が面で連続するから、各層固有の特性を
相乗的に発揮し、酸素、水蒸気、炭素ガス等の各種気体
や、水、有機液体、アンモニア水、塩酸等の各種液体に
対して優れたバリヤー性を示し、更に内容物を充填した
状態でも落下の衝撃にも十分耐え得る優れた強度乃至耐
剥離性を有している。この特性の故に、本発明の多層ブ
ロー成形容器は、種々の内容物、特に液状、クリーム
状、ペースト状の食品類、化粧品、医薬品、インク、現
像液、各種有機溶媒、無機及び有機の薬品類、液体燃料
等を、比較的長期に渡って保存するのに優れて有効であ
る。[Effect] In the multilayer blow-molded container of the present invention, since the same layers are continuous in the same plane as the surrounding container wall in the entire area of the pinch-off joint portion, the characteristics peculiar to each layer are synergistically exhibited. However, it has excellent barrier properties against various gases such as oxygen, water vapor, carbon gas, and various liquids such as water, organic liquids, ammonia water, hydrochloric acid, etc., and even when it is filled with contents, it can be impacted by falling. It has excellent strength and peel resistance that it can withstand sufficiently. Due to this property, the multi-layer blow-molded container of the present invention has various contents, particularly liquids, creams, pasty foods, cosmetics, pharmaceuticals, inks, developers, various organic solvents, inorganic and organic chemicals. , It is excellent and effective for storing liquid fuel and the like for a relatively long period of time.
【図1】本発明容器の一実施例の要部断面を示す縦断面
図。FIG. 1 is a vertical cross-sectional view showing a cross section of a main part of an embodiment of a container of the present invention.
【図2】他の実施例の要部断面を示す縦断面図。FIG. 2 is a vertical cross-sectional view showing a cross section of a main part of another embodiment.
【図3】本発明の多層ブロー成形法を説明する割型が開
いている状態の概略説明図。FIG. 3 is a schematic explanatory view illustrating a state in which a split mold is open, which illustrates the multilayer blow molding method of the present invention.
【図4】本発明の多層ブロー成形法を説明する割型が閉
じた状態の概略説明図。で、第3図は割型が開いている
状態を、第4図は割型が閉じた状態を示し、FIG. 4 is a schematic explanatory view illustrating a state in which a split mold is closed for explaining the multilayer blow molding method of the present invention. , Fig. 3 shows the split mold open, and Fig. 4 shows the split mold closed.
【図5】従来の容器のピンチオフ接合部の断面を溶断部
の割型形状と共に類型的に示す断面図。FIG. 5 is a cross-sectional view schematically showing a cross section of a pinch-off joint portion of a conventional container together with a split mold shape of a fusing portion.
【図6】従来の容器のピンチオフ接合部の断面を溶断部
の割型形状と共に類型的に示す断面図。FIG. 6 is a cross-sectional view schematically showing a cross section of a pinch-off joint part of a conventional container together with a split mold shape of a fusing part.
【図7】従来の容器のピンチオフ接合部の断面を溶断部
の割型形状と共に類型的に示す断面図。FIG. 7 is a cross-sectional view showing a typical cross section of a pinch-off joint portion of a conventional container together with a split mold shape of a fusing portion.
【図8】従来の容器のピンチオフ接合部の断面を溶断部
の割型形状と共に類型的に示す断面図。FIG. 8 is a cross-sectional view schematically showing a cross section of a pinch-off joint portion of a conventional container together with a split mold shape of a fusing portion.
【図9】本発明容器のピンチオフ接合部の断面を溶断部
の割型形状と共に類型的に示す断面図FIG. 9 is a cross-sectional view showing a typical cross-section of the pinch-off joint of the container of the present invention together with the split mold shape of the fusing part.
【図10】本発明容器のピンチオフ接合部の断面を溶断
部の割型形状と共に類型的に示す断面図FIG. 10 is a cross-sectional view showing a typical cross-section of the pinch-off joint of the container of the present invention together with the split mold shape of the fusing part.
1・・・中間層 2・・・外表面層 3・・・内表面層 4・・・ダイ 6・・・パリソン 7、8・・・割型 11、12・・・溶断部 13・・・凹溝 16・・・突状部 DESCRIPTION OF SYMBOLS 1 ... Intermediate layer 2 ... Outer surface layer 3 ... Inner surface layer 4 ... Die 6 ... Parison 7, 8 ... Split mold 11, 12 ... Fusing part 13 ... Groove 16 ... Projection
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 B32B 1/02 7016−4F 27/28 101 6122−4F 102 6122−4F 27/30 A 8115−4F 27/32 8115−4F // B29K 23:00 B29L 22:00 4F ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI Technical display location B32B 1/02 7016-4F 27/28 101 6122-4F 102 6122-4F 27/30 A 8115-4F 27/32 8115-4F // B29K 23:00 B29L 22:00 4F
Claims (4)
形により形成された内表面層、中間層及び外表面層の少
なくとも三層を含む多層成形された容器壁からなり且つ
少なくとも底部に前期パリソンのピンチオフにより形成
された接合部を備えたプラスチック容器において、前記
接合部は容器壁の厚さ方向外方に突出した突状部を形成
し、且つ該突状部が突出基部付近の絞り幅部に対して略
同一若しくはそれ以上の肉厚部を突出先端部方向に具備
し、且つ、突状部の突出高さH、前記絞り幅部の幅D1
及び肉厚部の幅D2が、成形後の容器壁の肉厚tに対し
て、 【数1】 【数2】 【数3】 の関係にあり、これにより容器壁を構成する各同一層同
士が前記接合部において実質的に面で連続していること
を特徴とする多層ブロー成形容器1. A multi-layered container wall comprising at least three layers of an inner surface layer, an intermediate layer and an outer surface layer formed by blow molding of a plastic tubular parison and formed by pinch off of the parison at least at the bottom. In a plastic container having a joined portion formed therein, the joined portion forms a protrusion protruding outward in the thickness direction of the container wall, and the protrusion is substantially with respect to the narrowed width portion near the protruding base. The same or more thick-walled portions are provided in the direction of the protruding tip portion, and the protruding height H of the protruding portion and the width D1 of the aperture width portion are provided.
And the width D2 of the thick portion with respect to the wall thickness t of the container wall after molding, [Equation 2] [Equation 3] The multi-layer blow-molded container is characterized in that the same layers constituting the container wall are substantially continuous in the joint portion in the plane.
状パリソンの容器壁が、ポリオレフィンからなる内表面
層、ポリオレフィンからなる外表面層、及びエチレン含
有量が25乃至75モル%でケン化度が少なくとも93
%のエチレン−酢酸ビニル共重合体ケン化物、アクリロ
ニトリル−アクリル酸共重合体、或いはポリアミドから
なる中間層を含む多層成形物からなる多層ブロー成形容
器2. The container wall of the tubular parison according to claim 1, wherein an inner surface layer made of polyolefin, an outer surface layer made of polyolefin, and an ethylene content of 25 to 75 mol% and a saponification degree. Is at least 93
% Ethylene-vinyl acetate copolymer saponified product, acrylonitrile-acrylic acid copolymer, or multilayer blow molded container comprising a multilayer molded product including an intermediate layer composed of polyamide
とも三層を含む多層構造のプラスチックパリソンを同時
溶融押出により成形し、溶融押出された前記パリソン
を、型を合わせたときに溶断部に外向きに基部付近の絞
り幅部と該絞り幅部と同一もしくはそれ以上の肉圧部を
突出方向に有する凹溝が形成される一対の割型で挟み、
且つ該凹溝の深さH、前記絞り幅部の幅D1及び肉厚部
の幅D2が、成形後の容器壁の肉厚部tに対して、 【数1】 【数2】 【数3】の関係にあり、次いでこのパリソンを割型内で
膨張させ、これによりパリソン接合部に外方に前記凹溝
に対応する突状部を形成して、パリソン中の内表面層、
中間層及び外表面層の各同一層同士が前記接合部におい
て実質的に面で連続させることを特徴とするプラスチッ
ク製の多層ブロー成形容器の製法3. A plastic parison having a multilayer structure including at least three layers of an inner surface layer, an intermediate layer and an outer surface layer is formed by simultaneous melt extrusion, and the melt extruded parison is melted when a mold is fitted. To the outside is sandwiched by a pair of split molds in which a narrow groove near the base portion and a groove having the same or more wall thickness portion as the narrow width in the projecting direction are formed,
In addition, the depth H of the groove, the width D1 of the narrowed width portion, and the width D2 of the thick wall portion are as follows with respect to the thick wall portion t of the molded container wall. Then, the parison is expanded in the split mold, whereby a protrusion corresponding to the concave groove is formed outward at the parison joint, and an inner surface layer in the parison is formed.
A method for producing a multi-layer blow-molded container made of plastic, characterized in that the same layers of the intermediate layer and the outer surface layer are substantially continuous in the joint at the surface.
ラスチックパリソンが、ポリオレフィンからなる内表面
層、ポリオレフィンからなる外表面層、及びエチレン含
有量が25乃至75モル%でケン化度が少なくとも93
%のエチレン−酢酸ビニル共重合体ケン化物、アクリロ
ニトリル−アクリル酸共重合体、或いはポリアミドから
なる中間層を含む多層構造の同時溶融押出により形成し
てなることを特徴とする多層ブロー成形容器の製法4. The plastic parison according to claim 3, wherein the plastic parison has an inner surface layer made of polyolefin, an outer surface layer made of polyolefin, and an ethylene content of 25 to 75 mol% and a saponification degree of at least 93.
% Ethylene-vinyl acetate copolymer saponification product, acrylonitrile-acrylic acid copolymer, or a multilayer blow molding container characterized by being formed by simultaneous melt extrusion of a multilayer structure containing an intermediate layer consisting of polyamide.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26898191A JP2590033B2 (en) | 1991-09-20 | 1991-09-20 | Multilayer blow molded container |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26898191A JP2590033B2 (en) | 1991-09-20 | 1991-09-20 | Multilayer blow molded container |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0624431A true JPH0624431A (en) | 1994-02-01 |
JP2590033B2 JP2590033B2 (en) | 1997-03-12 |
Family
ID=17465998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP26898191A Expired - Fee Related JP2590033B2 (en) | 1991-09-20 | 1991-09-20 | Multilayer blow molded container |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2590033B2 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997045245A1 (en) * | 1996-05-30 | 1997-12-04 | Yoshino Kogyosho Co., Ltd. | Extrusion blow molded container having cylindrical drum portion and mold for shaping the container |
JPH11240527A (en) * | 1998-02-27 | 1999-09-07 | Kyoraku Co Ltd | Blow molded container |
JP2001163321A (en) * | 1999-09-30 | 2001-06-19 | Kuraray Co Ltd | Fuel container with excellent gasoline barrier property |
JP2004059077A (en) * | 2002-07-30 | 2004-02-26 | Yoshino Kogyosho Co Ltd | Blow-molded vessel and method for blow-molding the same |
JP2005246673A (en) * | 2004-03-02 | 2005-09-15 | Sakamoto Industry Co Ltd | Multilayer resin structure and housing |
WO2009107815A1 (en) | 2008-02-29 | 2009-09-03 | 株式会社 吉野工業所 | Blow-molded container and molding method thereof |
JP2009286437A (en) * | 2008-05-29 | 2009-12-10 | Yoshino Kogyosho Co Ltd | Blow molded container |
JP2012245742A (en) * | 2011-05-30 | 2012-12-13 | Mitsubishi Gas Chemical Co Inc | Direct blow container |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58973A (en) * | 1981-05-26 | 1983-01-06 | ザ・ハルコン・エス・デイ−・グル−プ・インコ−ポレ−テツド | Manufacture of alkylene carbonate |
JPS58220738A (en) * | 1982-06-18 | 1983-12-22 | 日産自動車株式会社 | Blow molding vessel |
JPS59115234A (en) * | 1982-12-07 | 1984-07-03 | キヨ−ラク株式会社 | Multilayer vessel |
-
1991
- 1991-09-20 JP JP26898191A patent/JP2590033B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58973A (en) * | 1981-05-26 | 1983-01-06 | ザ・ハルコン・エス・デイ−・グル−プ・インコ−ポレ−テツド | Manufacture of alkylene carbonate |
JPS58220738A (en) * | 1982-06-18 | 1983-12-22 | 日産自動車株式会社 | Blow molding vessel |
JPS59115234A (en) * | 1982-12-07 | 1984-07-03 | キヨ−ラク株式会社 | Multilayer vessel |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997045245A1 (en) * | 1996-05-30 | 1997-12-04 | Yoshino Kogyosho Co., Ltd. | Extrusion blow molded container having cylindrical drum portion and mold for shaping the container |
JPH11240527A (en) * | 1998-02-27 | 1999-09-07 | Kyoraku Co Ltd | Blow molded container |
JP2001163321A (en) * | 1999-09-30 | 2001-06-19 | Kuraray Co Ltd | Fuel container with excellent gasoline barrier property |
JP2004059077A (en) * | 2002-07-30 | 2004-02-26 | Yoshino Kogyosho Co Ltd | Blow-molded vessel and method for blow-molding the same |
JP2005246673A (en) * | 2004-03-02 | 2005-09-15 | Sakamoto Industry Co Ltd | Multilayer resin structure and housing |
WO2009107815A1 (en) | 2008-02-29 | 2009-09-03 | 株式会社 吉野工業所 | Blow-molded container and molding method thereof |
JP2009286437A (en) * | 2008-05-29 | 2009-12-10 | Yoshino Kogyosho Co Ltd | Blow molded container |
JP2012245742A (en) * | 2011-05-30 | 2012-12-13 | Mitsubishi Gas Chemical Co Inc | Direct blow container |
Also Published As
Publication number | Publication date |
---|---|
JP2590033B2 (en) | 1997-03-12 |
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