JPH0240499B2 - - Google Patents
Info
- Publication number
- JPH0240499B2 JPH0240499B2 JP61003012A JP301286A JPH0240499B2 JP H0240499 B2 JPH0240499 B2 JP H0240499B2 JP 61003012 A JP61003012 A JP 61003012A JP 301286 A JP301286 A JP 301286A JP H0240499 B2 JPH0240499 B2 JP H0240499B2
- Authority
- JP
- Japan
- Prior art keywords
- bottle
- polyester resin
- intermediate material
- cap
- saturated polyester
- 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 - Lifetime
Links
- 229920001225 polyester resin Polymers 0.000 claims description 31
- 239000004645 polyester resin Substances 0.000 claims description 31
- 229920006395 saturated elastomer Polymers 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 29
- 238000000071 blow moulding Methods 0.000 claims description 27
- 239000007787 solid Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 238000001746 injection moulding Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 235000014171 carbonated beverage Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 235000014214 soft drink Nutrition 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、例えば、炭酸含有飲料水や清涼飲料
水等を充填するのに好適な薄肉の飽和ポリエステ
ル樹脂製壜の製造方法に関するもので、二軸延伸
ブロー成形によつて得られる飽和ポリエステル樹
脂製壜の剛性や強度等の低下の要因となつている
極端な薄肉化が壜底部から壜胴部下方において生
ずるようなことがなく、しかも、載置安定性にお
いて優れた性質を有する薄肉の飽和ポリエステル
樹脂製の壜の製造方法を提供するものである。DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a method for manufacturing a thin-walled saturated polyester resin bottle suitable for filling carbonated beverages, soft drinks, etc., for example. Extreme thinning, which is a factor in reducing the rigidity and strength of saturated polyester resin bottles obtained by biaxial stretch blow molding, does not occur from the bottom of the bottle to the lower part of the bottle body, and The present invention provides a method for manufacturing a thin-walled saturated polyester resin bottle that has excellent placement stability.
「従来の技術」
従来のガラス壜に代わる合成樹脂製壜を得る方
法として、衛生性，強靭性等の観点から、二軸延
伸ブロー成形を利用した飽和ポリエステル製の壜
を得る方法が提案されている。``Prior art'' As a method of obtaining synthetic resin bottles to replace conventional glass bottles, a method of obtaining saturated polyester bottles using biaxial stretch blow molding has been proposed from the viewpoint of hygiene and toughness. There is.
この二軸延伸ブロー成形による飽和ポリエステ
ル樹脂製壜の製造方法としては、上端が開放口縁
部とされている有底の中空体からなる中間素材
を、射出成形等によつて成形し、得られた中間素
材を延伸温度に過熱すると共に、吹き込み成形用
の金型内で二軸延伸ブロー成形する方法が汎用さ
れている。 The method for producing a saturated polyester resin bottle using biaxial stretch blow molding involves molding an intermediate material consisting of a bottomed hollow body with an open rim at the upper end by injection molding or the like. A commonly used method is to heat an intermediate material to a stretching temperature and then perform biaxial stretch blow molding in a blow mold.
「発明が解決しようとする課題」
ところで、前記２軸延伸ブロー成形法を利用す
る飽和ポリエステル樹脂製壜の製造方法において
は、二軸延伸ブロー成形によつて得られる壜の強
度の増大を計るものであることから、二軸延伸ブ
ロー成形時の延伸倍率をできるだけ高くすること
が望ましく、この結果、得られる二軸延伸ブロー
成形体からなる壜は、薄肉に成形される。"Problem to be Solved by the Invention" By the way, in the method for manufacturing a saturated polyester resin bottle using the biaxial stretch blow molding method, the method aims to increase the strength of the bottle obtained by biaxial stretch blow molding. Therefore, it is desirable to make the stretching ratio as high as possible during biaxial stretch blow molding, and as a result, the resulting bottle made of the biaxial stretch blow molded product is formed into a thin wall.
このことによつて、二軸延伸ブロー成形体から
なる壜は、剛性や強度等が不足し、容易に変形し
易いという欠点を有している。 As a result, bottles made of biaxially stretched blow-molded bodies have the disadvantage that they lack rigidity, strength, etc., and are easily deformed.
特に前述の薄肉に起因する変形は、壜の成形工
程上において、きわめて肉薄化し易い壜の底部周
縁（底部と胴部との境界縁）部で激しく、壜底部
において、十分な強度と剛性とを有する壜が得ら
れ難い。 In particular, the deformation caused by the thin wall described above is severe at the bottom peripheral edge of the bottle (the boundary edge between the bottom and the body), which is extremely prone to thinning during the bottle forming process. It is difficult to obtain a bottle with this.
これに対して、本発明の飽和ポリエステル樹脂
製壜の製造方法は、耐内圧性において優れてお
り、特に、壜の接地部を含む壜底部の補強が十分
に行なわれている薄肉の壜で、しかも、起立安定
性においても優れた作用を奏する飽和ポリエステ
ル樹脂製壜を、容易、かつ、確実に得る方法を提
供する。 On the other hand, the method for producing a saturated polyester resin bottle of the present invention has excellent internal pressure resistance, and is particularly suitable for producing thin-walled bottles with sufficient reinforcement at the bottom of the bottle, including the ground-contacting part. Furthermore, the present invention provides a method for easily and reliably obtaining a saturated polyester resin bottle that exhibits excellent standing stability.
「課題を解決するための手段」
本発明の飽和ポリエステル樹脂製壜の製造方法
は、通常ピースと呼称される飽和ポリエステル樹
脂製の有底中空体からなる中間素材を、目的の最
終成形体である壜の外郭形状と同一の内周面形状
を有する吹き込み成形用金型内で、二軸延伸ブロ
ー成形に付す工程からなる。"Means for Solving the Problems" The method for producing a saturated polyester resin bottle of the present invention involves converting an intermediate material consisting of a bottomed hollow body made of saturated polyester resin, usually called a piece, into a desired final molded product. It consists of a step of subjecting it to biaxial stretch blow molding in a blow molding mold that has the same inner circumferential shape as the outer shape of the bottle.
本発明の飽和ポリエステル樹脂製壜の製造方法
においては、二軸延伸ブロー成形に付される中間
素材として、上端が開放口縁部とされている頚部
と、該頚部に連続する胴部と、該胴部に連続し、
その下端が丸底頂部とされている底部とを具備
し、その内周面には、丸底頂部から胴部下端に至
る複数本の中実の突条リブが、丸底頂部から胴部
下端に向かつて放射状に突設されている有底中空
体からなる飽和ポリエステル樹脂製の中間素材を
利用し、また、目的の最終成形体である壜の外郭
形状と同一の内周面形状を有する吹き込み成形用
金型として、底部の内周面中央部が上方へ突出す
る帽状部とされている吹き込み成形用金型内を利
用するものである。 In the method for manufacturing a saturated polyester resin bottle of the present invention, as an intermediate material subjected to biaxial stretch blow molding, a neck portion whose upper end is an open mouth edge portion, a body portion continuous to the neck portion, and Continuous to the torso,
and a bottom whose lower end is a round bottom top, and on its inner peripheral surface, a plurality of solid protruding ribs extending from the round bottom top to the bottom end of the trunk, from the round bottom top to the bottom end of the trunk. An intermediate material made of saturated polyester resin consisting of a hollow body with a bottom that protrudes radially toward As a molding die, a blow molding die is used in which the center of the inner circumferential surface of the bottom portion is a cap-shaped portion that projects upward.
前記吹き込み成形用金型内での二軸延伸ブロー
成形は、延伸温度に加熱されている前述の中間素
材を、通常の二軸延伸ブロー成形に付すことによ
つて行なうもので、かかる二軸延伸ブロー成形に
よつて、吹き込み成形用金型の内周面と合致する
外郭形状の薄肉の壜、すなわち、壜底部の中央部
が壜内方へ突出する帽状部とされている壜で、し
かも、内周面には、前記帽状部の上端部から壜胴
部下方に至る複数本の中実の突状リブが、壜底部
中心から壜胴部へ向かつて放射状に突設されてい
る飽和ポリエステル樹脂製壜が得られる。 Biaxial stretch blow molding in the blow mold is performed by subjecting the aforementioned intermediate material heated to the stretching temperature to normal biaxial stretch blow molding. A thin-walled bottle whose outer shape matches the inner circumferential surface of a blow-molding mold by blow molding, that is, a bottle whose bottom center part is a cap-shaped part that protrudes inward; , on the inner peripheral surface, a plurality of solid protruding ribs extending from the upper end of the cap-shaped part to the lower part of the bottle body are provided, which protrude radially from the center of the bottle bottom toward the bottle body. A polyester resin bottle is obtained.
前述の構成からなる本発明の飽和ポリエステル
樹脂製壜の製造方法で使用される中間素材は、飽
和ポリエステル樹脂による射出成形によつて得ら
れるものであり、外周面に凹条部が形成されてい
るコアを使用することによつて容易に成形され得
る。 The intermediate material used in the method for producing a saturated polyester resin bottle of the present invention having the above-mentioned configuration is obtained by injection molding with a saturated polyester resin, and has grooves formed on the outer peripheral surface. It can be easily molded by using a core.
なお、中間素材における中実の突条リブは、中
間素材が所定の二軸延伸ブロー成形に付されて得
られる壜において、中実の突条リブの壜胴部側の
上端が、壜底部における帽状部の上面を含む水平
面よりも上方に位置することとなる程度の区域に
亙つて形成され得るように、中間素材の内周面の
所定の領域に突設されていれば、本発明方法によ
つて得られる薄肉の壜における中実の突条リブに
よる作用が完壁になる。 Note that the solid protruding ribs in the intermediate material are such that, in a bottle obtained by subjecting the intermediate material to a predetermined biaxial stretch blow molding, the upper end of the solid protruding rib on the bottle body side is located at the bottom of the bottle. The method of the present invention can be applied as long as the protrusion is provided in a predetermined area of the inner circumferential surface of the intermediate material so that it can be formed over an area that is located above the horizontal plane including the upper surface of the cap-shaped part. The effect of the solid protruding ribs on the thin-walled bottle obtained by this method is perfect.
また、二軸延伸ブロー成形は、前記中間素材を
延伸適温に加熱した後、吹き込み成形用金型内に
セツトし、その内部に圧縮空気を吹き込むと共
に、押し下げ棒を中間素材の内部に挿入して、底
部を押し下げることによつて行なわれるもので、
吹き込み成形用金型の内周面形状と合致する外郭
形状の二軸延伸ブロー成形体からなる飽和ポリエ
ステル樹脂製の壜、ずなわち、壜底部の中央部が
壜内方へ凸出する帽状部とされている壜で、しか
も、壜内周面には、前記帽状部の上端部から壜胴
部下方に至る複数本の中実の突状リブが、壜底部
中心から壜胴部へ向かつて放射状に突設されてい
る薄肉の壜が得られる。 In addition, in biaxial stretch blow molding, the intermediate material is heated to an appropriate temperature for stretching, then set in a blow molding mold, compressed air is blown into the mold, and a push rod is inserted into the intermediate material. , which is done by pressing down on the bottom.
A bottle made of saturated polyester resin made of a biaxially stretched blow-molded body with an outer shape that matches the inner circumferential shape of a blow-molding mold, that is, a cap-shaped bottle in which the center of the bottom of the bottle protrudes inward. In addition, the inner peripheral surface of the bottle has a plurality of solid protruding ribs extending from the upper end of the cap-shaped part to the lower part of the bottle body. A thin-walled bottle with radial protrusions on the front end is obtained.
「実施例」
以下、本発明の飽和ポリエステル樹脂製壜の製
造方法の具体的な構成を、図面に基づいて説明す
る。"Example" Hereinafter, a specific configuration of the method for manufacturing a saturated polyester resin bottle of the present invention will be described based on the drawings.
第１図にて符号１で表示される中間素材を、飽
和ポリエステル樹脂を利用した射出成形によつて
得た。 An intermediate material designated by reference numeral 1 in FIG. 1 was obtained by injection molding using a saturated polyester resin.
前記射出成形によつて得られた中間素材１は、
キヤツプ螺合用の螺子２が外周面に突設されてお
り、かつ、上端が開放口縁部とされている頚部３
と、該頚部３に連続する胴部４と、該胴部４に連
続し、その下端が丸底頂部５とされている底部６
とからなる有底中空体によつて形成されており、
丸底頂部５から胴部４の下方に亙る内周面には、
丸底頂部５から胴部下端７に向かう12本の中実の
突条リブ８，８……が、放射状に突設されてい
る。 The intermediate material 1 obtained by the injection molding is
A neck portion 3 having a screw 2 for screwing the cap protruding from the outer peripheral surface and having an open mouth edge at the upper end.
, a body part 4 that is continuous to the neck part 3, and a bottom part 6 that is continuous to the body part 4 and has a round bottom top part 5 at its lower end.
It is formed by a bottomed hollow body consisting of
On the inner circumferential surface extending from the round bottom top 5 to the lower part of the body 4,
Twelve solid projecting ribs 8, 8, . . . extend radially from the round bottom top 5 toward the bottom end 7 of the body.
前記得られた中間素材１を延伸適温に加熱した
後、金型底部の内周面中央部が上方へ突出する帽
状部とされている吹き込み成形用金型内にセツト
し、その内部に圧縮空気を吹き込むと共に、押し
下げ棒を中間素材１の内部に挿入して底部を押し
下げることによる通常の二軸延伸ブロー成形に付
し、第２図にて符号９で表示される二軸延伸ブロ
ー成形体からなる飽和ポリエステル樹脂製の壜を
得た。 After heating the obtained intermediate material 1 to a suitable temperature for stretching, it is set in a blow molding mold in which the center of the inner circumferential surface of the bottom of the mold is a cap-shaped part that protrudes upward, and a compressed material is placed inside the mold. A biaxially stretched blow-molded product, which is indicated by reference numeral 9 in FIG. 2, is subjected to normal biaxial stretch blow molding by blowing air and pushing down the bottom part by inserting a push-down rod into the interior of the intermediate material 1. A bottle made of saturated polyester resin was obtained.
飽和ポリエステル樹脂製壜９は、中間素材１に
おける頚部３が延伸成形されることなくそのまま
の形状に維持されてなる頚部３と、上方が丸みを
有している肩部１０Ａとされている横断面円形の
円筒状の胴部１０と、その中央部が壜内方へ突出
する帽状部１２とされている底部１１とを具備し
ており、帽状部１２の上端部から胴部１０の下部
に至る壜内周面には、壜底部１１の中心から壜胴
部１０へ向かつて放射状をなしている12本の中実
の突条リブ１３，１３……が突設されている。 The saturated polyester resin bottle 9 has a cross section in which the neck 3 of the intermediate material 1 is maintained in the same shape without being stretched, and the shoulder 10A is rounded at the top. It has a circular cylindrical body 10 and a bottom 11 whose center part is a cap-shaped part 12 that protrudes inward of the bottle. Twelve solid protruding ribs 13, 13, . . . , which extend radially from the center of the bottle bottom 11 toward the bottle body 10, are provided on the inner circumferential surface of the bottle.
なお、12本の中実の突条リブ１３，１３……
は、中間素材１における中実の突条リブ８，８…
…の二軸延伸ブロー成形部分である。 In addition, 12 solid protruding ribs 13, 13...
are solid protruding ribs 8, 8... in the intermediate material 1.
It is a biaxial stretch blow molded part of...
「発明の作用，効果」
本発明の飽和ポリエステル樹脂製壜の製造方法
は、上端が開放口縁部とされている頚部と、該頚
部に連続する胴部と、該胴部に連続し、その下端
が丸底頂部とされている底部とを具備し、前記丸
底頂部から胴部下端に至る内周面には、丸底頂部
から胴部に向かつて放射状をなしている複数本の
中実の突条リブが突設されている有底中空体から
なる飽和ポリエステル樹脂製の中間素材と、底部
の内周面中央部が上方へ突出する帽状部とされて
いる吹き込み成形用金型とを利用して二軸延伸ブ
ロー成形を行なうもので、前記構成の中間素材を
延伸温度に加熱し、次いで、吹き込み成形用金型
内にセツトし、通常の二軸延伸ブロー成形を行な
うことによつて、壜底部の中央部が壜内方へ凸出
する帽状部とされており、しかも、前記帽状部の
上端部から壜胴部下方に至る内周面には、壜底部
中心から壜胴部に向かつて放射状をなす複数本の
中実の突条リブが突設されている薄肉の飽和ポリ
エステル樹脂製壜が得られる。"Operations and Effects of the Invention" The method for producing a saturated polyester resin bottle of the present invention comprises: a neck whose upper end is an open rim; a body continuous to the neck; a bottom portion whose lower end is a round bottom top portion, and on the inner peripheral surface from the round bottom top portion to the bottom end of the body, there are a plurality of solid solids radially extending from the round bottom top portion toward the body portion. An intermediate material made of saturated polyester resin consisting of a hollow body with a bottom on which protruding ribs are protruding, and a blow molding mold in which the center of the inner peripheral surface of the bottom is a cap-shaped part that protrudes upward. This method performs biaxial stretch blow molding by heating the intermediate material with the above structure to the stretching temperature, then setting it in a blow mold and performing normal biaxial stretch blow molding. The center part of the bottle bottom is a cap-shaped part that protrudes inward, and the inner circumferential surface extending from the upper end of the cap-shaped part to the lower part of the bottle body has a cap-shaped part extending from the center of the bottle bottom to the bottom of the bottle body. A thin-walled saturated polyester resin bottle is obtained in which a plurality of solid protruding ribs projecting radially toward the body are provided.
したがつて、本発明の飽和ポリエステル樹脂製
壜の製造方法では、中間素材を二軸延伸ブロー成
形に付すことによつて得られる通常の壜の場合
に、最も補強され難い壜底部から壜胴部下部にか
けて、底部中心から壜胴部下部に向かう複数本の
放射状の中実の突条リブが、壜内周面に突設され
ているところの二軸延伸ブロー成形体からなる壜
が得られる。 Therefore, in the method for manufacturing a saturated polyester resin bottle of the present invention, in the case of a normal bottle obtained by subjecting an intermediate material to biaxial stretch blow molding, from the bottom of the bottle to the body of the bottle, which are the most difficult to be reinforced. A bottle made of a biaxially stretched blow-molded body is obtained, in which a plurality of radial solid protruding ribs project from the inner circumferential surface of the bottle from the center of the bottom toward the bottom of the bottle body.
このため、壜底部内周面に放射状に突設されて
いる中実の突条リブによる補強効果は勿論のこ
と、隣接する突条リブ同士の間の薄肉化が、中間
素材の内周面に突設されている中実の突条リブが
二軸延伸されることによつて抑止されるので、剛
性においても優れた作用を奏する飽和ポリエステ
ル樹脂製壜が得られる。 Therefore, in addition to the reinforcing effect of the solid ribs protruding radially on the inner peripheral surface of the bottle bottom, the thinning between adjacent ribs also increases the inner peripheral surface of the intermediate material. Since the protruding solid protruding ribs are restrained by being biaxially stretched, a saturated polyester resin bottle with excellent rigidity can be obtained.
さらに、本発明方法で得られる飽和ポリエステ
ル樹脂製壜は、補強作用を奏する中実の突条リブ
が壜の内周面において突設されたものとなるの
で、壜の外観に不自然さが無く、体裁の良好な壜
となる。 Furthermore, since the saturated polyester resin bottle obtained by the method of the present invention has solid protruding ribs protruding from the inner circumferential surface of the bottle that have a reinforcing effect, the bottle does not have an unnatural appearance. , resulting in a bottle with good appearance.
さらにまた、本発明方法においては、壜底部の
中央部が壜内方突出する帽状部とされており、し
かも、壜内周面には、帽状部の上端部から壜胴部
下端に至る放射状の複数本の中実の突条リブを具
備する飽和ポリエステル樹脂製の薄肉壜が得られ
るため、壜底部における前述の中央部の帽状部構
造と、壜内周面の中実の突条リブとの相乗作用に
よつて、耐内圧性に対してきわめて優れた作用を
奏し、かつ、壜底部における帽状部を囲繞する円
環状部の存在により、水平面上での自立安定性に
おいて優れた作用を奏する壜が得られる。 Furthermore, in the method of the present invention, the center part of the bottom of the bottle is formed into a cap-shaped part that projects inward of the bottle, and the inner peripheral surface of the bottle extends from the upper end of the cap-shaped part to the lower end of the bottle body. Since a thin-walled bottle made of saturated polyester resin is obtained which has a plurality of radial solid protruding ribs, the above-mentioned center cap structure at the bottom of the bottle and the solid protruding ribs on the inner circumference of the bottle can be obtained. Due to the synergistic effect with the ribs, it has an extremely excellent effect on internal pressure resistance, and due to the presence of the annular part surrounding the cap-shaped part at the bottom of the bottle, it has excellent self-supporting stability on a horizontal surface. A bottle that works is obtained.
特に、本発明方法で得られる飽和ポリエステル
樹脂製壜における前述の中央部が壜内方突出する
帽状部とされている壜底部における構造は、自立
安定性において優れた作用を奏するものであつ
て、例えば、ベルトコンベア上を移送されてくる
壜に対して、液状の内填物を自動充填するような
場合に、自動充填ノズルから壜口がずれるような
ことがないため、すなわち、壜の自立不安定さに
基づく充填不良が回避されるため、適切な自動充
填がなされる。 In particular, the structure of the bottom of the saturated polyester resin bottle obtained by the method of the present invention, in which the center portion is a cap-shaped portion projecting inward, exhibits an excellent self-supporting stability. For example, when automatically filling a bottle with liquid filling while it is being transported on a belt conveyor, the bottle opening does not shift from the automatic filling nozzle, which means that the bottle can stand on its own. Filling failures due to instability are avoided, so that proper automatic filling is achieved.
第１図は、本発明の飽和ポリエステル樹脂製壜
の製造方法で使用される中間素材の１実施例品を
示す断面図、第２図は、本発明の飽和ポリエステ
ル樹脂製壜の製造方法によつて得られた壜の１実
施例品の一部を断面で示した側面図、第３図は、
第２図の―線断面図である。
１……中間素材、３……頚部、４……胴部、５
……丸底頂部、６……底部、７……胴部下端、
８，８……中間素材１における中実の突条リブ、
９……飽和ポリエステル樹脂製壜、１０……壜胴
部、１１……壜底部、１２……壜内方へ突出する
帽状部、１３，１３……壜９における中実の突条
リブ。
FIG. 1 is a cross-sectional view showing one example of an intermediate material used in the method for manufacturing a saturated polyester resin bottle of the present invention, and FIG. FIG. 3 is a side view showing a cross section of a part of an example bottle obtained by
FIG. 2 is a sectional view taken along the line -- in FIG. 2; 1... Intermediate material, 3... Neck, 4... Torso, 5
...Round bottom top, 6...Bottom, 7...Bottom end of trunk,
8, 8...Solid protruding rib in intermediate material 1,
9... Saturated polyester resin bottle, 10... Bottle body, 11... Bottle bottom, 12... Cap-shaped portion projecting inward of the bottle, 13, 13... Solid protruding rib on bottle 9.
Claims (1)
部に連続する胴部と、該胴部に連続し、その下端
が丸底頂部とされている底部とを具備し、内周面
には、前記丸底頂部から胴部下端に至る複数本の
中実の突条リブが、丸底頂部から胴部下端に向か
つて放射状に突設されている有底中空体からなる
飽和ポリエステル樹脂製の中間素材を、該中間素
材の延伸温度に加熱し、次いで、底部の内周面中
央部が上方へ突出する帽状部とされている吹き込
み成形用金型内で該中間素材を二軸延伸ブロー成
形することにより、壜底部の中央部が壜内方へ凸
出する帽状部とされており、しかも、壜内周面に
は、前記帽状部の上端部から壜胴部下方に至る複
数本の中実の突状リブが、壜底部中心から壜胴部
へ向かつて放射状に突設されている薄肉の壜を得
ることを特徴とする飽和ポリエステル樹脂製壜の
製造方法。1 Comprising a neck whose upper end is an open mouth edge, a trunk continuous to the neck, and a bottom continuous to the trunk and whose lower end is a rounded top, and has an inner peripheral surface. is made of saturated polyester resin and consists of a bottomed hollow body in which a plurality of solid protruding ribs extend radially from the top of the round bottom to the bottom end of the body. The intermediate material is heated to the stretching temperature of the intermediate material, and then the intermediate material is biaxially stretched in a blow molding mold in which the center of the inner circumferential surface of the bottom part is a cap-shaped part that projects upward. By blow molding, the center part of the bottom of the bottle is formed into a cap-shaped part that protrudes inward, and the inner peripheral surface of the bottle has a part extending from the upper end of the cap-shaped part to the lower part of the bottle body. A method for manufacturing a saturated polyester resin bottle, characterized by obtaining a thin-walled bottle in which a plurality of solid protruding ribs project radially from the center of the bottom of the bottle toward the body of the bottle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61003012A JPS61217337A (en) | 1986-01-10 | 1986-01-10 | Manufacture of bottle made of saturated polyester resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61003012A JPS61217337A (en) | 1986-01-10 | 1986-01-10 | Manufacture of bottle made of saturated polyester resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61217337A JPS61217337A (en) | 1986-09-26 |
| JPH0240499B2 true JPH0240499B2 (en) | 1990-09-12 |
Family
ID=11545426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61003012A Granted JPS61217337A (en) | 1986-01-10 | 1986-01-10 | Manufacture of bottle made of saturated polyester resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61217337A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5296170A (en) * | 1976-02-09 | 1977-08-12 | Yoshino Kogyosho Co Ltd | Container stretched along two axes |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5625857Y2 (en) * | 1976-03-06 | 1981-06-18 |
-
1986
- 1986-01-10 JP JP61003012A patent/JPS61217337A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5296170A (en) * | 1976-02-09 | 1977-08-12 | Yoshino Kogyosho Co Ltd | Container stretched along two axes |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61217337A (en) | 1986-09-26 |
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