JPH0392326A - Preparation of stretched blow bottle fitted with handle - Google Patents
Preparation of stretched blow bottle fitted with handleInfo
- Publication number
- JPH0392326A JPH0392326A JP22834789A JP22834789A JPH0392326A JP H0392326 A JPH0392326 A JP H0392326A JP 22834789 A JP22834789 A JP 22834789A JP 22834789 A JP22834789 A JP 22834789A JP H0392326 A JPH0392326 A JP H0392326A
- Authority
- JP
- Japan
- Prior art keywords
- preform
- blow
- handle
- bottle
- air
- 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
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000000071 blow moulding Methods 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000007664 blowing Methods 0.000 claims description 34
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 238000000465 moulding Methods 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 206010011224 Cough Diseases 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/46—Knobs or handles, push-buttons, grips
- B29L2031/463—Grips, handles
Abstract
Description
【発明の詳細な説明】
（イ）発明の目的
〔産業上の利用分野〕
本発明は、塩化ビニル樹脂からなる把手付き延伸ブロー
ボトルの製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Object of the invention [Field of industrial application] The present invention relates to a method for manufacturing a stretched blow bottle with a handle made of vinyl chloride resin.
近時、プラスチックの強度が向上して内容積の大きいプ
ラスチック製ボトルが使用され始めた為、持ち運びの容
易な把手付きボトルが求められている。Recently, as the strength of plastics has improved and plastic bottles with larger internal volumes have begun to be used, there is a demand for bottles with handles that are easy to carry.
従来、把手付きプラスチック製ボトルは、代表的なボト
ル成形法の一つであるブロー成形法よれば、ダイレクト
ブロー成形法により次に示すような方法で製造されてい
た。Conventionally, plastic bottles with handles have been manufactured by the blow molding method, which is one of the typical bottle molding methods, using the direct blow molding method as shown below.
すなわち、押出機から押出されてくる中空状パリソンに
底を設けると共に空気を吹き込みプリブローを得、該ブ
リブローを把手穴の形成用の突起部を有する一対の半割
型のブロー用金型で挟み込み、ブローにより当該金型の
形状に膨張させて、把手穴となるべき部位が前記突起部
ではさみ閉じられたボトルを得、次いで把手用の穴の内
側をくり抜くという方法が通常用いられていた。That is, a hollow parison extruded from an extruder is provided with a bottom, air is blown into it to obtain a pre-blow, and the pre-blow is sandwiched between a pair of half-split blowing molds each having a protrusion for forming a handle hole. A commonly used method is to inflate the bottle into the shape of the mold by blowing to obtain a bottle in which the portion that will become the handle hole is sandwiched between the projections, and then hollow out the inside of the hole for the handle.
他方、最近ブロー成形の分野においては、ダイレクトブ
ロー成形法の他に、該成形法よりも力学的強度、透明性
およびガスバリアー性等に優れた戊形品が得られる延伸
ブロー威形法が開発され実用化されている。On the other hand, recently, in the field of blow molding, in addition to the direct blow molding method, a stretch blow molding method has been developed that can produce shaped products with superior mechanical strength, transparency, gas barrier properties, etc. than the direct blow molding method. It has been put into practical use.
延伸ブロー成形法は、予備ブロー威形または射出成形さ
れたプリフォームを、ブロー用金型内において、樹脂の
ガラス転移温度以上であって融点ないし流動開拍点未満
の温度条件下で、ストレンチビンによる縦方向への延伸
とブローによる横方向への延伸により延伸成形する方法
であり、上記延伸により、成形体素材の熱可塑性樹脂の
高分子鎖が分子配向するために、前記の如き優れた特性
を有する成形品が得られる。In the stretch blow molding method, a pre-blown or injection molded preform is vertically molded in a stretch bottle in a blow mold at a temperature above the glass transition temperature of the resin and below the melting point or flow opening point. This is a method of stretch-molding by stretching in the direction and stretching in the lateral direction by blowing, and the stretching causes molecular orientation of the polymer chains of the thermoplastic resin of the molded body material, so it has the excellent properties described above. A molded product is obtained.
したがって、把手付きプラスチックボトルについても、
上記延伸ブロー成形法を適用したいという要望は出され
ていたが、延伸ブロー成形法においては前記のとおり、
ブロー用金型内におけるプリフォームの温度が、成形素
材の融点ないし流動開始点未満の温度であるため、前述
したダイレクトブロー成形法による把手付きボトルの製
造方法、すなわち把手用の穴を形成させるべき突起部を
有する一対の半割型の金型を用いる方法を適用しても、
口頚部を溶着させることが出来ないため、該口頚部の外
側に生じるぼり部を切除すると、切除した跡が溶着して
おらず、使用可能なボトルを得ることは事実上不可能で
あった。Therefore, regarding plastic bottles with handles,
There has been a request to apply the above stretch blow molding method, but as mentioned above, in the stretch blow molding method,
Since the temperature of the preform in the blow mold is below the melting point or flow start point of the molding material, it is necessary to use the direct blow molding method described above to produce a bottle with a handle, that is, to form a hole for the handle. Even if a method using a pair of half-split molds with protrusions is applied,
Since the mouth and neck cannot be welded together, when the ribs formed on the outside of the mouth and neck are removed, the cut remains are not welded, making it virtually impossible to obtain a usable bottle.
それ故に、延伸ブロー成形法では、ダイレクトブロー成
形法において採用されている方法とは異なる把手部の形
成方法が提案されており、たとえばボトル本体と別途に
成形した把手を嵌合等の方法により、延伸ブロー成形さ
れたボトル本体に取りつけるという方法（特公昭６３ｉ
１２１８号公報）等が代表的な例として知られている。Therefore, in the stretch blow molding method, a method for forming the handle portion that is different from the method adopted in the direct blow molding method has been proposed. For example, by fitting a separately molded handle to the bottle body, A method of attaching it to a stretch-blow-molded bottle body (Special Publication Act 1986
1218) etc. are known as typical examples.
しかしながら、上記方法によって得られる把手付き延伸
ブローボトルは、把手とボトルとが一つのプリフォーム
から一体成形されていないため、把手のボトル本体への
固定において信頼性に欠け易く、また製造工程も複雑に
なるという問題点を有している。However, the stretched blow bottle with handle obtained by the above method tends to lack reliability in fixing the handle to the bottle body because the handle and bottle are not integrally molded from one preform, and the manufacturing process is complicated. It has the problem of becoming.
本発明者らは、延伸ブロー成形法による把手付きブロー
ボトルの製造方法について検討を行い、可動型プラグす
なわち可動型の突起が装着されたブロー用金型を用い、
プリフォームから把手用の凹部を有する延伸ブローボト
ルを成形する過程において、プリフォームの体積が最終
体積の８０％以上の大きさにまで膨張したとき、咳金型
に装着された可動型プラグでプリフォームの把手用の穴
となるべき部位を押しはさみ、把手用の穴に相当する形
状の凹部を有するボトルを得、ついで上記凹部の周縁部
を高周波誘電加熱により加熱溶着して密封した後に、該
周縁部の内側をくり抜くという把手付き延伸ブローボト
ルの製造方法を提案している（特開昭６３−２２２８３
５号公報）。The present inventors investigated a method for manufacturing a blow bottle with a handle using a stretch blow molding method, and used a blow mold equipped with a movable plug, that is, a movable protrusion.
During the process of molding a stretched blow bottle with a concave part for a handle from a preform, when the volume of the preform expands to 80% or more of the final volume, the movable plug attached to the cough mold A bottle with a recess shaped like the hole for the handle is obtained by pressing the area that should become the hole for the handle of the reformer, and then the periphery of the recess is sealed by heat welding using high frequency dielectric heating. We have proposed a method for manufacturing a stretched blow bottle with a handle by hollowing out the inside of the periphery (Japanese Patent Application Laid-Open No. 63-22283).
Publication No. 5).
しかしながら上記提案の方法によっても、プラグで押し
伸ばされた部分すなわち把手部の穴に沿った部分の肉厚
が薄く、該部分の機械的強度は今一歩であった。However, even with the method proposed above, the wall thickness of the portion pushed out by the plug, that is, the portion along the hole of the handle portion is thin, and the mechanical strength of this portion is not good enough.
（口）発明の構戒
〔課題を解決するための手段〕
本発明者らは、前記課題を解決するために鋭意検討した
結果、可動型プラグを有する延伸ブロー用金型を用いて
、プリフォームから把手用の凹部を有する延伸ブローボ
トルを成形する際に、従来延伸ブロー法において行われ
ていた常温の空気による一次低圧ブローに代えて、１５
０〜２５０″Ｃの高温の空気による一次低圧ブローを使
用して、プリフォームの内側の表層の温度を塩化ビニル
樹脂の溶融温度近傍にまで高め、かつ一次低圧ブローに
よってプリフォームを最終体積の７０％以上に膨らませ
た後に、可動型プラグを作動させるという手段を採用す
ることにより、得られる把手用の凹部を有する延伸ブロ
ーボトルによれば、次の工程で高周波誘電加熱により咳
凹部の内側をくり抜くことにより、把手穴の接合部周辺
の機械的強度が極めて優れるボトルになることを見出し
、本発明を完戒するに至った。(Explanation) Principles of the Invention [Means for Solving the Problems] As a result of intensive studies to solve the above problems, the present inventors have developed a method for forming preforms using a stretch blowing mold having a movable plug. When forming a stretch blow bottle with a concave portion for a handle, instead of the primary low pressure blowing with room temperature air that was carried out in the conventional stretch blow method,
The temperature of the inner surface layer of the preform is raised to near the melting temperature of the vinyl chloride resin using primary low-pressure blowing with air at a high temperature of 0 to 250"C, and the preform is reduced to 70% of its final volume by the primary low-pressure blowing. % or more and then actuating the movable plug, the resulting stretched blow bottle has a recess for the handle.In the next step, the inside of the cough recess is hollowed out using high-frequency dielectric heating. As a result, the inventors discovered that a bottle with extremely excellent mechanical strength around the joint portion of the handle hole could be obtained, and the present invention was completely abandoned.
すなわち、本発明は、下記工程（１）および工程〔ＩＩ
〕からなることを特徴とする把手付き延伸ブローボトル
の製造方法である。That is, the present invention comprises the following step (1) and step [II
] This is a method for manufacturing a stretched blow bottle with a handle.
〔Ｉ〕対向する一対の可動型プラグを有するブロー用金
型を用いて、ストレッチビンによる延伸とブローとによ
りプリフォームを延伸ブロー威形する過程において、１
５０〜２５０″Ｃの空気を用いる一次低圧ブローによっ
てプリフォームを最終体積の７０％以上に膨張させた後
、前記プラグを該プリフォームの肩部に押し込み、該プ
リフォームの肩部に把手用の凹部を形成し、その後一次
ブローよりも低温の空気を用いる二次高圧ブローに切り
換えて延伸ブローボトルを威形する工程。[I] In the process of stretching and blowing a preform by stretching and blowing with a stretch bin using a blow mold having a pair of opposing movable plugs, 1.
After inflating the preform to more than 70% of its final volume by primary low-pressure blowing with air at 50-250"C, the plug is pushed into the shoulder of the preform, and a handle for the handle is inserted into the shoulder of the preform. The process of forming a concave portion and then switching to a secondary high-pressure blowing process that uses air at a lower temperature than the primary blowing process to shape the stretched blow bottle.
〔■〕高周波誘電加熱により、上記の把手用の凹部の周
縁部を加熱溶融した後、該凹部を挟んだ状態にある電極
を移動させて、前記周縁部を密封しその内側をくり抜く
工程。[■] A step of heating and melting the periphery of the recess for the handle using high-frequency dielectric heating, and then moving the electrodes sandwiching the recess to seal the periphery and hollowing out the inside thereof.
以下、本発明について更に詳しく説明する。The present invention will be explained in more detail below.
本発明における一次低圧ブロー用の空気の温度は、１５
０〜２５０’Ｃであり、より好ましくは１８０〜２３０
℃である。従来の延伸ブロー成形法で一次低圧ブロー（
以下単に一次ブローという）に用いられていた２０〜３
０″Ｃの常温の空気では勿論、１５０℃未満の空気では
温度が低すぎ、得られる把手付きボトルにおける、把手
部の穴の接合部周辺の機械的強度が劣り、一方２５０℃
を超える温度の空気では、塩化ビニル樹脂が熱分解する
。The temperature of the air for primary low pressure blowing in the present invention is 15
0 to 250'C, more preferably 180 to 230'C
It is ℃. Primary low-pressure blowing (
20-3 used for (hereinafter simply referred to as primary blow)
Of course, air at room temperature of 0''C, but air below 150℃ is too low, and the resulting bottle with a handle has poor mechanical strength around the joint of the hole in the handle.
In air at temperatures above , vinyl chloride resin thermally decomposes.
一次ブローの空気圧は、従来の延伸ブロー成形法におけ
る一次低圧ブローとほぼ同様で良く、１。５〜４ ｋｇ
／ｃｉが適当である。The air pressure of the primary blow may be almost the same as that of the primary low pressure blow in the conventional stretch blow molding method, and the air pressure is 1.5 to 4 kg.
/ci is appropriate.
また本発明においては、一次ブローを従来の延伸ブロー
成形法より長時間行い、一次ブローによってプリフォー
ムを最終体積の７０％以上に、好ましくは７０〜９５％
にまで膨張させる。かかる体積にまでプリフォームを膨
張させるための一次ブローの継続時間は、該ブロー用の
空気圧および目的とするボトルの容積に応じて決定され
、たとえば３． ５ ｋｇ／ｃＪの空気圧の一次ブロー
により１．８リットル程度のボトルを製造する場合には
、２〜３秒程度が適当である。In addition, in the present invention, the primary blowing is performed for a longer time than in the conventional stretch blow molding method, and the primary blowing increases the preform to 70% or more of the final volume, preferably 70 to 95%.
Expand to. The duration of the primary blow to expand the preform to such a volume is determined depending on the air pressure for the blow and the intended volume of the bottle, for example 3. When producing a bottle of approximately 1.8 liters by primary blowing at an air pressure of 5 kg/cJ, approximately 2 to 3 seconds is appropriate.
可動型プラグによる把手用の凹部の形成は、一次ブロー
によってプリフォームが最終体積の７０％以上に膨張さ
せられた後に、金型に装着されたプラグをプリフォーム
の肩部に押し込むことによってなされる。プリフォーム
は、通常一次ブロー開始後間もなく最終体積の７０％以
上に膨張し、その際プリフォームの肩部周辺は、ほぼ金
型の内壁近傍にまで膨張しており、プラグの挿入により
把手用の凹部を形成させるのに適した状態にあるので、
プラグ作動時期は、一次ブロー開始直後が目安となる。The recess for the handle is formed by the movable plug by pushing the plug attached to the mold into the shoulder of the preform after the preform is expanded to 70% or more of its final volume by primary blowing. . The preform normally expands to more than 70% of its final volume soon after the primary blow starts, and at this time the area around the shoulder of the preform expands almost to the inner wall of the mold, and by inserting the plug, the area for the handle is expanded. Since it is in a suitable state for forming a recess,
The approximate timing for plug activation is immediately after the start of the primary blow.
本発明においては、上記操作によってプリフォームに形
成される凹部において、相対する樹脂面が、該凹部の周
縁上において狭い幅で弱く溶着する。かかる周縁部での
溶着が、後に高周波誘電によって該周縁部の内側をくり
抜いて得られるボトルの把手部の接合部の機械的強度を
向上させることに寄与していると判断される。In the present invention, in the recess formed in the preform by the above operation, opposing resin surfaces are weakly welded in a narrow width on the periphery of the recess. It is judged that such welding at the peripheral edge contributes to improving the mechanical strength of the joint of the bottle handle, which is obtained by hollowing out the inside of the peripheral edge later using high-frequency dielectric.
一次ブローから低温空気の二次高圧ブロー（以下単に二
次ブローという）へ切り換える時点は、プリフォームが
最終体積の９５％以上１００％未満に達した時が好まし
い。二次ブローの空気温度は７〜１０℃が好ましく、ま
たその圧力は８〜９眩／ｃｎｌが好ましい。The time point at which the primary blowing is switched to the secondary high-pressure blowing of low-temperature air (hereinafter simply referred to as secondary blowing) is preferably when the preform reaches 95% or more and less than 100% of its final volume. The air temperature for the secondary blow is preferably 7 to 10°C, and the pressure is preferably 8 to 9 dazzles/cnl.
以下、添付図面を用いて、本発明の一態様を示す。Hereinafter, one embodiment of the present invention will be described using the accompanying drawings.
第１図に示すように、プリフォーム１を油圧或いは空気
圧等により作動する、対向する一対のブラグ２を有する
ブロー用金型３（以下単に金型という）で挟み、次いで
、ストレッチビン４でプリフォームｌの底部を突き出す
。それと同時に又はその直後にブロービン５から一次ブ
ロー用空気を吹き込み、プリフォーム１を膨張させる。As shown in FIG. 1, a preform 1 is sandwiched between blowing molds 3 (hereinafter simply referred to as molds) having a pair of opposing plugs 2 that are operated by hydraulic pressure or pneumatic pressure, and then a stretch bin 4 is used to blow the preform 1. Push out the bottom of Reform l. At the same time or immediately after that, primary blowing air is blown from the blow bin 5 to expand the preform 1.
プリフォーム１の体積が金型３の内容積の７０〜９０％
に達したとき、第１図のＡ−Ａ・横断面を表す第２図の
ような状態に、ブラグ２を押し込み、さらにプリフォー
ム１の体積が金型３の内容積の９５％程度に達したとき
一次ブローから二次ブローに切り換えて、金型３内に第
３図の如き形状を有する延伸ブローボトル７を成形する
。The volume of preform 1 is 70 to 90% of the internal volume of mold 3
When the preform 1 reaches approximately 95% of the internal volume of the mold 3, the plug 2 is pushed into the state shown in FIG. 2, which represents the A-A cross section in FIG. At this time, the primary blowing is switched to the secondary blowing, and a stretched blow bottle 7 having a shape as shown in FIG. 3 is formed in the mold 3.
斯くして得られたボトル７は、高周波誘電加熱により、
該ボトルに設けられた把手用の凹部６の内側をくり抜く
。The bottle 7 thus obtained is heated by high frequency dielectric heating.
The inside of the handle recess 6 provided in the bottle is hollowed out.
下記のような電極を有し、容量が３ｋｗ程度で周波数が
４０．４６ＭＨｚ程度の高周波誘電加熱装置を使用して
、第４図に示すようにボトル７の凹部６の周縁部に一対
の電極８を押し当て、かかる状態で通常１〜４秒間通電
し、該周縁部を０．２〜２閣程度の幅で一周に渡り加熱
溶融した後、通常高周波を切り約Ｉ秒程度放冷させ、周
縁部７における樹脂が未だ溶融状態にある内に、ボトル
７を挾んだ状態で電極の一方を突き出し、同時にもう一
方の電極を引くことにより、凹部６の内側をくり抜く。Using a high-frequency dielectric heating device having electrodes as shown below, a capacity of about 3 kW, and a frequency of about 40.46 MHz, a pair of electrodes 8 are placed around the periphery of the recess 6 of the bottle 7 as shown in FIG. is pressed, and in this state, electricity is normally applied for 1 to 4 seconds to heat and melt the periphery in a width of about 0.2 to 2 mm, and then the high frequency is usually turned off and the periphery is allowed to cool for about I seconds. While the resin in the portion 7 is still in a molten state, one of the electrodes is pushed out while holding the bottle 7, and at the same time the other electrode is pulled, thereby hollowing out the inside of the recess 6.
高周波誘電加熱装置の電極材質としては、銅を主戒分と
してベリリウムを０．４〜２．５重量％程度含むベリリ
ウムー銅合金が好ましく、その先端部の外周の大きさと
しては、凹部６の周縁部の周囲より僅かに小さいのが好
ましく、又、周縁部を０．２〜２ｍｍ程度の幅で一周に
渡り加熱溶融するために、電極面の外周近傍に設けられ
る加熱部分が０．２〜２印程度の幅で突起しているもの
が好ましく、特にその幅を０．２〜０． ４ ｍｍ程度
とすると、凹部６の内側のくり抜きが容易になる。The electrode material of the high-frequency dielectric heating device is preferably a beryllium-copper alloy containing copper as the main component and beryllium in an amount of about 0.4 to 2.5% by weight. It is preferable that the heating portion is slightly smaller than the periphery of the electrode surface, and in order to heat and melt the periphery around the periphery with a width of about 0.2 to 2 mm, the heating portion provided near the outer periphery of the electrode surface has a width of 0.2 to 2 mm. It is preferable that the protrusion is as wide as a mark, and in particular, the width should be 0.2 to 0. When the thickness is about 4 mm, the inside of the recess 6 can be easily hollowed out.
また電極は、使用時に４５〜８０℃程度の温度に維持さ
れるように、ヒーターを内蔵しているものが好ましい。Further, the electrode preferably has a built-in heater so that the temperature is maintained at about 45 to 80° C. during use.
（ハ）発明の効果
高温の空気による一次ブローにより、プリフォームを最
終体積の７０％以上に膨張させるという新規な手段を採
用する本発明によれば、ブロー成形の過程において、
■低圧空気で比較的ゆっくりと最終体積付近にまで膨ら
まされるので、他の部位に先駆けて膨らみ始める把手部
となるべきプリフォームの肩部の肉厚が薄くなり難く、
また
■プリフォームの樹脂温度が高いため、把手用の凹部を
形成すべくプラグが押し込まれる際に、押される部分の
樹脂がプラグの動きに追随できる
という利点が生じ、把手部の穴の接合部周辺の機械的強
度が極めて強いという優れた効果が奏される。(c) Effects of the invention According to the present invention, which employs a novel method of expanding the preform to 70% or more of its final volume by primary blowing with high-temperature air, in the process of blow molding, ■ Comparison with low-pressure air Since the preform is slowly inflated to near its final volume, the shoulder part of the preform, which should become the handle part, starts to inflate before other parts, and the thickness of the shoulder part of the preform is less likely to become thinner.
In addition, since the resin temperature of the preform is high, when the plug is pushed in to form the recess for the handle, there is an advantage that the resin in the pushed part can follow the movement of the plug, and the joint of the hole in the handle An excellent effect is achieved in that the mechanical strength of the periphery is extremely strong.
さらに本発明によって得られる把手付きボトルは、延伸
ブローによる優れた物性を具備しているため、少ない目
付量でも機械的強度に優れ、かつ透明性およびガスバリ
ャー性も良好であり、各種内容物の長期保存に適してい
る。Furthermore, the bottle with handle obtained by the present invention has excellent physical properties due to stretch blowing, so it has excellent mechanical strength even with a small area weight, and has good transparency and gas barrier properties, so that it can hold various contents for a long time. Suitable for storage.
以下、実施例および比較例を示して、本発明をさらに具
体的に説明する。EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples.
各例では、ポリ塩化ビニル系の下記コンバウンド７１ｇ
を目付け量として、内容積が１．８リットルのボトルを
製造する際に、それぞれ第１表に記載の条件の一次ブロ
ーを採用した。In each example, 71g of the following polyvinyl chloride compound
When manufacturing a bottle with an internal volume of 1.8 liters using a basis weight of 1.8 liters, primary blowing was performed under the conditions listed in Table 1.
用いた成形機は、田原昭栄機工■製のストレッチハンデ
ィボトル製造機Ｔ Ｓ −６０３４ Ｌであり、原料は
、スズ系及びカルシウム／亜鉛系安定剤で安定化された
重合度７００のポリ塩化ビニルＣ以下ＰＶＣという）を
主体とする市販の吹き込み成形用ＰＶｃコンバウンド（
アロンコンバウンドＢＬ２Ｓ８Ｖｌ ：東亜合成化学工
業株式会社製）である。The molding machine used was a stretch handy bottle making machine TS-6034L manufactured by Tahara Shoei Kiko ■, and the raw material was polyvinyl chloride C with a degree of polymerization of 700 stabilized with tin-based and calcium/zinc-based stabilizers. Commercially available PVc compound for blow molding (hereinafter referred to as PVC)
Aronconbound BL2S8Vl: manufactured by Toagosei Chemical Industry Co., Ltd.).
なお一次ブロー用の空気の加熱は、内径５０ｍｍで長さ
１．５ｍの保温された鋼管の内部に、５ｋｗのシーズヒ
ーターを挿入した加熱装置によった。The air for primary blowing was heated by a heating device in which a 5 kW sheathed heater was inserted into a heat-insulated steel pipe with an inner diameter of 50 mm and a length of 1.5 m.
各例において延伸ブロー成形された、把手用の凹部を有
するボトルは、高周波誘電加熱により該凹部の内側をく
り抜き、把手付き延伸ブローボトルに成形した後、第１
表下に内容を示した密封性試験を行った。その結果は、
一次ブローの条件と合わせて第１表に示した。In each example, a stretch-blow-molded bottle having a recess for a handle is hollowed out inside the recess by high-frequency dielectric heating and formed into a stretch-blow bottle with a handle.
A sealing test was conducted as shown below. The result is
The conditions are shown in Table 1 together with the conditions for primary blowing.
第１図はプリフォームｌを挟み込んだ状態のブラグ２付
き金型の縦断面図であり、第２図はブラグ２が押し込ま
れた状態における第ｌ図Ａ−Ａ・断面図であり、第３図
の〔１〕は延伸ブロー成形された凹部６を有するボトル
７の正面図であり、第３図の〔２〕は同じボトルの断面
図であり、第４図はポトル７の凹部６を高周波誘電加熱
により加圧溶着する様子を示す模式図である。1 is a vertical sectional view of the mold with the plug 2 in a state where the preform 1 is sandwiched, FIG. 2 is a sectional view taken along the line A-A in FIG. [1] in the figure is a front view of a bottle 7 having a stretch-blow-molded concave portion 6, [2] in FIG. 3 is a cross-sectional view of the same bottle, and FIG. FIG. 3 is a schematic diagram showing pressure welding by dielectric heating.
Claims (1)
特徴とする把手付き延伸ブローボトルの製造方法。 〔 I 〕対向する一対の可動型プラグを有するブロー用
金型を用いて、ストレッチピンによる延伸とブローとに
よりプリフォームを延伸ブロー成形する過程において、
１５０〜２５０℃の空気を用いる一次低圧ブローによっ
てプリフォームを最終体積の７０％以上に膨張させた後
、前記プラグを該プリフォームの肩部に押し込み、該プ
リフォームの肩部に把手用の凹部を形成し、その後一次
低圧ブローよりも低温の空気を用いる二次高圧ブローに
切り換えて延伸ブローボトルを成形する工程。 〔II〕高周波誘電加熱により、上記の把手用の凹部の周
縁部を加熱溶融した後、該凹部を挟んだ状態にある電極
を移動させて、前記周縁部を密封しその内側をくり抜く
工程。[Claims] 1. A method for producing a stretched blow bottle with a handle, which comprises the following steps [I] and [II]. [I] In the process of stretch blow molding a preform by stretching and blowing with stretch pins using a blow mold having a pair of opposing movable plugs,
After the preform is expanded to 70% or more of its final volume by primary low-pressure blowing using air at 150 to 250°C, the plug is pushed into the shoulder of the preform, and a recess for a handle is formed in the shoulder of the preform. The process of forming a stretched blow bottle by switching to a secondary high-pressure blowing process that uses air at a lower temperature than the primary low-pressure blowing process. [II] A step of heating and melting the periphery of the recess for the handle using high-frequency dielectric heating, and then moving the electrodes sandwiching the recess to seal the periphery and hollowing out the inside thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1228347A JPH0796257B2 (en) | 1989-09-05 | 1989-09-05 | Method of manufacturing stretched blow bottle with handle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1228347A JPH0796257B2 (en) | 1989-09-05 | 1989-09-05 | Method of manufacturing stretched blow bottle with handle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0392326A true JPH0392326A (en) | 1991-04-17 |
| JPH0796257B2 JPH0796257B2 (en) | 1995-10-18 |
Family
ID=16875042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1228347A Expired - Lifetime JPH0796257B2 (en) | 1989-09-05 | 1989-09-05 | Method of manufacturing stretched blow bottle with handle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0796257B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0664193A1 (en) * | 1992-01-14 | 1995-07-26 | Yoshino Kogyosho Co., Ltd. | Primary mold of bottle body with handle and method of manufacturing bottle body with handle |
| JP2003103612A (en) * | 2001-09-28 | 2003-04-09 | Toyo Seikan Kaisha Ltd | Handy bottle manufacturing method and obtained handy bottle |
| US6733716B2 (en) | 2001-05-21 | 2004-05-11 | Sabel Plastechs Inc. | Method of making a stretch/blow molded article (bottle) with an integral projection such as a handle |
| JP2004155206A (en) * | 2004-02-05 | 2004-06-03 | Sahara Kagaku Kogyo Kk | Die for molding bottle for carbonated beverage |
| KR100479685B1 (en) * | 2002-10-08 | 2005-03-31 | 동아정밀공업(주) | The receptacle P.E.T and equipment formation of handle receptacle P.E.T |
| US7153455B2 (en) | 2001-05-21 | 2006-12-26 | Sabel Plastechs Inc. | Method of making a stretch/blow molded article (bottle) with an integral projection such as a handle |
| JP2014512286A (en) * | 2011-03-29 | 2014-05-22 | アムコー リミテッド | Container forming method |
| KR101406300B1 (en) * | 2012-02-29 | 2014-06-12 | 김두연 | Equipment formation of handle receptacle p.e.t |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5574840A (en) * | 1978-12-01 | 1980-06-05 | Yoshino Kogyosho Co Ltd | Biaxial stretch blow moulding for polyethylene terephthalate resin bottle with handle |
| JPS5759725A (en) * | 1980-09-29 | 1982-04-10 | Toyo Seikan Kaisha Ltd | Polyester container with handle and preparation thereof |
| JPS63222835A (en) * | 1987-03-13 | 1988-09-16 | Toagosei Chem Ind Co Ltd | Manufacture of eared stretch-blown plastic bottle |
-
1989
- 1989-09-05 JP JP1228347A patent/JPH0796257B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5574840A (en) * | 1978-12-01 | 1980-06-05 | Yoshino Kogyosho Co Ltd | Biaxial stretch blow moulding for polyethylene terephthalate resin bottle with handle |
| JPS5759725A (en) * | 1980-09-29 | 1982-04-10 | Toyo Seikan Kaisha Ltd | Polyester container with handle and preparation thereof |
| JPS63222835A (en) * | 1987-03-13 | 1988-09-16 | Toagosei Chem Ind Co Ltd | Manufacture of eared stretch-blown plastic bottle |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0664193A1 (en) * | 1992-01-14 | 1995-07-26 | Yoshino Kogyosho Co., Ltd. | Primary mold of bottle body with handle and method of manufacturing bottle body with handle |
| EP0664193A4 (en) * | 1992-01-14 | 1995-12-20 | Yoshino Kogyosho Co Ltd | Primary mold of bottle body with handle and method of manufacturing bottle body with handle. |
| US6733716B2 (en) | 2001-05-21 | 2004-05-11 | Sabel Plastechs Inc. | Method of making a stretch/blow molded article (bottle) with an integral projection such as a handle |
| US7153455B2 (en) | 2001-05-21 | 2006-12-26 | Sabel Plastechs Inc. | Method of making a stretch/blow molded article (bottle) with an integral projection such as a handle |
| JP2003103612A (en) * | 2001-09-28 | 2003-04-09 | Toyo Seikan Kaisha Ltd | Handy bottle manufacturing method and obtained handy bottle |
| KR100479685B1 (en) * | 2002-10-08 | 2005-03-31 | 동아정밀공업(주) | The receptacle P.E.T and equipment formation of handle receptacle P.E.T |
| JP2004155206A (en) * | 2004-02-05 | 2004-06-03 | Sahara Kagaku Kogyo Kk | Die for molding bottle for carbonated beverage |
| JP2014512286A (en) * | 2011-03-29 | 2014-05-22 | アムコー リミテッド | Container forming method |
| US10035293B2 (en) | 2011-03-29 | 2018-07-31 | Amcor Group Gmbh | Method of forming a container |
| KR101406300B1 (en) * | 2012-02-29 | 2014-06-12 | 김두연 | Equipment formation of handle receptacle p.e.t |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0796257B2 (en) | 1995-10-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0346518B1 (en) | Process for producing stretch blow-molded bottle with a handle | |
| EP1069983B1 (en) | Wide-mouth, heat-set, pinch-grip containers and method of forming them | |
| US3412188A (en) | Process for biaxially oriented bottles | |
| FI65395C (en) | PROTECTION OF PLASTIC FOUNDATION | |
| US3941542A (en) | Apparatus for blow molding plastic articles | |
| JPS63249616A (en) | Method for molding resin | |
| JPH0392326A (en) | Preparation of stretched blow bottle fitted with handle | |
| JP5567310B2 (en) | Blow molding method for flat containers | |
| US11958229B2 (en) | Resin container manufacturing method | |
| JPH0628893B2 (en) | A method for making blown polyethylene terephthalate blow molded articles with integral outer protrusions, for example handles. | |
| JPH0272925A (en) | Manufacture of stretched blow bottle with handle | |
| US3418398A (en) | Method of heating parison preforms | |
| JPH0272928A (en) | Manufacture of stretched blow bottle with handle | |
| CA1296495C (en) | Process for producing stretch blow-molded bottle with a handle | |
| JPS5951889B2 (en) | Injection stretch blow molding method | |
| JPH0272926A (en) | Manufacture of stretched blow bottle with handle | |
| JPS62187012A (en) | Manufacture of hollow container | |
| JP2963644B2 (en) | Molding method of plastic bottle having constricted shape | |
| JP3892561B2 (en) | Manufacturing method of sealed hollow container | |
| USRE29045E (en) | Method for blow molding plastic articles | |
| JPH0272927A (en) | Manufacture of stretched blow bottle with handle | |
| JPH04336237A (en) | Container fitted with hanger and manufacture thereof | |
| JPH10244582A (en) | Rib-forming blow molding method | |
| JPH09187859A (en) | Production of hollow molded form | |
| JP3802970B2 (en) | Propylene polymer container excellent in impact resistance and method for producing the same |