JPH085117B2 - Pressure-resistant thin synthetic resin container and method of molding the same - Google Patents
Pressure-resistant thin synthetic resin container and method of molding the sameInfo
- Publication number
- JPH085117B2 JPH085117B2 JP28433988A JP28433988A JPH085117B2 JP H085117 B2 JPH085117 B2 JP H085117B2 JP 28433988 A JP28433988 A JP 28433988A JP 28433988 A JP28433988 A JP 28433988A JP H085117 B2 JPH085117 B2 JP H085117B2
- Authority
- JP
- Japan
- Prior art keywords
- container
- peripheral wall
- synthetic resin
- outer peripheral
- pressure
- 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
Classifications
-
- 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
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
- B65D1/0261—Bottom construction
- B65D1/0276—Bottom construction having a continuous contact surface, e.g. Champagne-type bottom
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は炭酸飲料、ビールなど容器内で圧力を発生
する飲料の包装に適した耐圧性薄肉合成樹脂容器とその
成形方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a pressure-resistant thin-walled synthetic resin container suitable for packaging beverages such as carbonated beverages and beer that generate pressure in the container, and a method for molding the same.
［従来の技術］ 底部構造が、容器胴部に連なる薄肉の外周壁部と、該
外周壁部の下端から内側に折返し形成された内周壁部
と、内外周壁の折返し部分に生じた環状接地面と、内周
壁部の上部に連続して形成されたドーム状の底壁中央部
とから構成された耐圧性合成樹脂容器は特開昭55−1631
37号公報、実開昭58−183308号公報等により公知となっ
ている。[Prior Art] A bottom structure has a thin outer peripheral wall portion connected to a container body, an inner peripheral wall portion formed by folding back from the lower end of the outer peripheral wall portion, and an annular grounding surface formed at the folded portion of the inner and outer peripheral walls. And a pressure-resistant synthetic resin container composed of a dome-shaped bottom wall central part formed continuously on the upper part of the inner peripheral wall part is disclosed in Japanese Patent Application Laid-Open No. 55-1631.
It is publicly known from Japanese Patent No. 37, Japanese Utility Model Publication No. 58-183308, and the like.
［発明が解決しようとする課題］ 上記底部構造を有する容器では、内周壁部とその上方
に連続形成したドーム状の底壁中央部とにより、耐圧性
をもたせているが、その耐圧性は主として環状接地面と
内周壁部の成形状態に左右され、肉厚分布が設計と異な
って成形されると、耐圧性や耐衝撃強度が低下し易い問
題を有する。[Problems to be Solved by the Invention] In the container having the above-mentioned bottom structure, pressure resistance is provided by the inner peripheral wall portion and the central portion of the dome-shaped bottom wall continuously formed thereabove, but the pressure resistance is mainly If the wall thickness is formed differently from the design depending on the molding state of the annular grounding surface and the inner peripheral wall portion, there is a problem that the pressure resistance and the impact strength are likely to decrease.
このため同一金型により多数の製品を同時成形する
と、キャビテイごとに異なる若干の成形条件の差によ
り、外観上は問題は無いが、容器底部の強度が劣るもの
が生じ、成形ロスとなることが多い。Therefore, if many products are molded at the same time using the same mold, there will be no problem in appearance due to slight differences in molding conditions depending on cavities, but the strength of the bottom of the container may be inferior, resulting in molding loss. Many.
この発明は上記従来の耐圧性容器における成形の困難
性を解決するために考えられたものであって、その目的
は容器底部の主なる部分を容器胴部よりも厚肉に延伸形
成し、これにより耐圧性を向上させるとともに、或程度
の成形条件の差が生じても、肉厚分布を均一に成形する
ことができる新たな構成の耐圧性薄肉合成樹脂容器とそ
の成形方法を提供することにある。This invention was conceived in order to solve the difficulty of molding in the above conventional pressure-resistant container, and its purpose is to form the main part of the container bottom by forming it to be thicker than the container body, To provide a pressure-resistant thin-walled synthetic resin container having a new structure and a molding method capable of improving the pressure resistance and molding a uniform wall thickness distribution even if some molding condition difference occurs. is there.
［課題を解決するための手段］ 上記目的によるこの発明１つは、熱可塑性合成樹脂に
よる有底のプリフオームを軸方向に延伸するとともに、
空気圧により容器胴部が薄肉で容器底部が弧状の容器を
成形し、その弧状底部を内方に押返して、容器底部を容
器胴部に連なる薄肉の外周壁部と、該外周壁部の下端か
ら内側に折返し形成された内周壁部と、内外周壁部の折
返し部分に生じた環状接地面と、内周壁部の上部に連続
して形成された底壁中央部とから構成した薄肉合成樹脂
容器において、上記環状接地面の外側から底壁中央部に
及ぶ底面全体を、外周壁部との境に段部を設けて略等し
く厚肉に形成してなる耐圧性薄肉合成樹脂容器にある。[Means for Solving the Problems] According to one aspect of the present invention according to the above object, a bottomed preform made of a thermoplastic synthetic resin is stretched in an axial direction, and
A container is thinned by air pressure and a container bottom is formed into an arc-shaped container, and the arcuate bottom is pushed back inward, and the container bottom is connected to the container body by a thin outer peripheral wall and a lower end of the outer peripheral wall. A thin-walled synthetic resin container composed of an inner peripheral wall formed by folding back from the inner side, an annular grounding surface formed in the folded back portion of the inner and outer peripheral wall, and a bottom wall center formed continuously on the upper part of the inner peripheral wall. In the pressure-resistant thin synthetic resin container, the entire bottom surface extending from the outside of the annular grounding surface to the central portion of the bottom wall is formed to have a substantially equal thickness by providing a step at the boundary with the outer peripheral wall.
またこの発明の他の１つは、熱可塑性合成樹脂による
有底のプリフオームの容器底部成形部分を、内側に段部
を設けて他の部分より厚肉に形成し、そのプリフオーム
を昇降自在な底型を有する吹込金型内にて、段部より上
方を軸方向に延伸するとともに、空気圧により容器底部
の主たる部分が容器胴部よりも厚肉で弧状の容器を一次
的に成形し、その弧状底部を上記底型により胴部と一体
で薄肉の外周壁部を除き内方に押返して、該外周壁部の
下端から内側に折返し形成された内周壁部と、内外周壁
部の折返し部分に生じた環状接地面と、内周壁部の上部
に連続して形成された底壁中央部とからなり、かつ環状
接地面の外側から底壁中央部に及び底面全体が、外周壁
部との境に段部を有する厚肉の容器底部に形成する耐圧
性薄肉合成樹脂容器の成形方法にある。According to another aspect of the present invention, a bottomed preform container bottom molding portion made of a thermoplastic synthetic resin is formed with a step inside so as to be thicker than other portions, and the preform can be raised and lowered freely. Inside the blow mold having a mold, while extending axially above the step, the main part of the container bottom is thicker than the container body by air pressure, and an arc-shaped container is primarily formed. The bottom part is pushed back inward except the thin outer peripheral wall part integrally with the body part by the above-mentioned bottom die, and the inner peripheral wall part is formed by being folded back inward from the lower end of the outer peripheral wall part, and the folded part of the inner and outer peripheral wall parts. It consists of the resulting annular grounding surface and the center of the bottom wall continuously formed on the top of the inner peripheral wall, and the entire bottom surface from the outside of the annular grounding surface to the center of the bottom wall is the boundary with the outer peripheral wall. Pressure-resistant thin-walled synthetic resin container formed at the bottom of a thick container having a step In the molding process.
［作 用］ 上記構成の容器では環状接地面の外側から底面全体が
厚肉に延伸成形されているため、環状接地面の曲げ強度
が薄肉の場合よりも強く、内容物の内圧による荷重がそ
こに集中しても、その荷重に耐える。また内周壁部及び
底部中央部の肉厚分布が均等で内部歪の発生も少ないの
で内底面に偏荷重が掛らず、耐衝撃強度も増す。[Operation] In the container with the above configuration, since the entire bottom surface is stretch-molded from the outside of the ring-shaped grounding surface, the bending strength of the ring-shaped grounding surface is stronger than when it is thin, and the load due to the internal pressure of the contents Withstands the load even when concentrated on. Further, since the thickness distribution of the inner peripheral wall portion and the center portion of the bottom portion is uniform and the occurrence of internal strain is small, an eccentric load is not applied to the inner bottom surface and the impact strength is increased.
［実施例］ 第１図から第３図は、ビン状に形成した耐圧性容器の
要部断面を示すもので、容器１は延伸吹込成形されたポ
リエチレンテレフタレートなどの熱可塑性樹脂からな
る。Example FIG. 1 to FIG. 3 show a cross section of a main part of a pressure-resistant container formed in a bottle shape. The container 1 is made of stretch blow-molded thermoplastic resin such as polyethylene terephthalate.
この容器１の容器胴部２は底部３の外周壁部31まで薄
肉に延伸吹込成形されている。また容器底部３は順次縮
径されて弯曲面となった外周壁部31の下端から、内側に
折返し形成された内周壁部32と、内周壁部31と内周壁部
32の折返し部分に生じた円弧状の環状接地面33と、内周
壁部32の上部に連続して略水平に形成された底壁中央部
34とから構成されている。The container body 2 of the container 1 is stretch-blow molded to a thin wall up to the outer peripheral wall 31 of the bottom 3. Further, the container bottom portion 3 is gradually reduced in diameter to form a curved surface, and from the lower end of the outer peripheral wall portion 31, an inner peripheral wall portion 32 formed by folding back inward, an inner peripheral wall portion 31, and an inner peripheral wall portion.
An arcuate annular grounding surface 33 formed at the folded portion of 32 and a central portion of the bottom wall continuously and horizontally formed on the upper portion of the inner peripheral wall portion 32.
And 34.
上記内周壁部32は環状接地面33の上端から斜めに折曲
された状態に形成され、また上記環状接地面33の外側か
ら底壁中央部34に及ぶ底面は、外周壁部31との境に段部
35を設けて全体的に略等しく、外周壁部の肉厚の略４倍
の厚肉に形成されている。The inner peripheral wall portion 32 is formed in a state of being obliquely bent from the upper end of the annular grounding surface 33, and the bottom surface extending from the outside of the annular grounding surface 33 to the bottom wall central portion 34 is a boundary with the outer peripheral wall portion 31. On the step
35 is provided and is generally equal in thickness, and is formed to have a thickness that is approximately four times the thickness of the outer peripheral wall portion.
このような構成の容器１では、底面の厚肉形成によ
り、内容物を充填した状態における落下強度が増し、大
きな内圧にも充分に耐えるが、具体的には次のような仕
様とすることが好ましい。In the container 1 having such a structure, the drop strength in the state of being filled with the contents is increased due to the formation of the thick bottom surface, and the container 1 can sufficiently withstand a large internal pressure. Specifically, the following specifications may be adopted. preferable.
容器胴部２と外周壁部31の肉厚ａ 0.4〜0.5mm 底面
の肉厚ｂ 1.6〜2.0mm 環状接地面33の曲率Ｒ 1.5〜
1.8mm 接地面から段部35の高Ｈ 2.0〜6.0mm 第４図から第10図は成形工程の説明図であって、上記
容器１は第４図に示す有底のプリフオーム４から成形さ
れる。Wall thickness of container body 2 and outer peripheral wall 31 a 0.4 to 0.5 mm Bottom wall thickness b 1.6 to 2.0 mm Curvature R 1.5 of annular grounding surface 33
1.8 mm Height of step 35 from the ground plane H 2.0 to 6.0 mm FIGS. 4 to 10 are explanatory views of the molding process, and the container 1 is molded from the bottomed preform 4 shown in FIG. .
このプリフオーム４は、容器１の底部成形部分となる
プリフオーム底部41の肉厚が、胴部成形部分となるプリ
フオーム側部42の肉厚より厚く射出成形されており、ま
たプリフオーム底部41と側部42との境の内側は段部43に
形成してある。この段部４の幅ｃの寸法は0.5〜1.0mm程
度でよく、底端から段部43までの高さｈは、上記容器１
の底面積に応じて任意に設定される。The preform 4 is injection-molded such that the thickness of the preform bottom portion 41, which is the bottom molding portion of the container 1, is thicker than the thickness of the preform side portion 42, which is the body molding portion, and the preform bottom portion 41 and the side portions 42. The inner side of the boundary with is formed in a stepped portion 43. The width c of the step 4 may be about 0.5 to 1.0 mm, and the height h from the bottom end to the step 43 is the same as the container 1 described above.
It is arbitrarily set according to the bottom area of the.
このプリフオーム４を図面では省略したが、第６図に
示すように、首部を保持して温度調整ポット５に入れ、
延伸に適した温度に調整する。プリフオーム４が射出成
形された直後のものにあっては、肉厚分布によって保有
温度が異なり、厚肉の方が温度が高いので、温度調整は
プリフオーム底部41と側部42とを分けて行なう。またプ
リフオーム内にには温調コア51を挿入して接触させ、段
部43から下のプリフオーム底部41をポツト底盤52を挿入
接触させて、加熱リング53からの輻射熱によるによる側
部42の温調とは異なった温度で行う。Although this preform 4 is omitted in the drawing, as shown in FIG.
Adjust to a temperature suitable for stretching. Immediately after the preform 4 is injection-molded, the holding temperature differs depending on the wall thickness distribution, and the thicker wall has a higher temperature. Therefore, the temperature adjustment is performed separately for the preform bottom portion 41 and the side portion 42. In addition, a temperature control core 51 is inserted into the preform and brought into contact therewith, and a lower preform bottom portion 41 from the step portion 43 is brought into contact with the pot bottom plate 52 so that the temperature of the side portion 42 is controlled by radiant heat from the heating ring 53. At a different temperature than.
この温調は具体的には、コア温度:30℃、加熱リング
温度:205℃、底盤温度:15℃程度の温度でよく、プリフ
オーム温度はプリフオーム底部41で110〜120℃、側部42
で90〜100℃に温調される。Specifically, this temperature control may be a core temperature of 30 ° C, a heating ring temperature of 205 ° C, and a bottom plate temperature of about 15 ° C. The preform temperature is 110 to 120 ° C at the preform bottom portion 41, and the side portion 42.
The temperature is adjusted to 90-100 ℃.
温調後、プリフオーム４は吹込金型６に移送される。
この金型の底部には第８図に示すように、容器底部の環
状接地面より内側を成形する底型61が昇降自在に設けて
ある。また型閉じによりキャビテイ中央に位置したプリ
フオーム４には、延伸ロッド62が挿入される。この延伸
ロッド62の先端部63は、断熱性を有するかまたは熱伝導
性が小さな物質により、プリフオーム先端部41の内形状
に適合した形状に形成されており、プリフオーム底部上
には係合縁64が突出形成してある。この係合縁64はプリ
フオーム内にて段部43と係合し、また先端部63はプリフ
オーム底部６内に収まる。After the temperature control, the preform 4 is transferred to the blow mold 6.
As shown in FIG. 8, a bottom die 61 for molding the inner side of the annular grounding surface of the container bottom is provided at the bottom of this die so that it can be raised and lowered. A stretch rod 62 is inserted into the preform 4 located at the center of the cavity when the mold is closed. The distal end portion 63 of the extension rod 62 is formed of a material having heat insulating property or low thermal conductivity into a shape that matches the inner shape of the preform distal end portion 41, and the engaging edge 64 is formed on the bottom of the preform. Are formed to project. The engaging edge 64 engages the step 43 in the preform and the tip 63 fits within the preform bottom 6.
このような状態にて延伸ロッド62を伸長すると、第８
図に示すように、プリフオーム４の延伸は保持された首
部と段部43との間の側部42のみとなり、プリフオーム底
部41はそのままの肉厚を保つて15℃程度に冷却されてい
る底型61まで延伸ロッドの先端部63と共に移動する。ま
た延伸に伴ない側部42が縮径してロッドに接触するの
で、延伸に際しては一次空気として８〜10Kg/cm2の空気
を吹込む。この吹込圧は延伸後に直に25Kg/cm2の圧力に
切替えられ、二次空気としてプリフオーム４をキャビテ
イ一杯に膨張し、底部71の主たる部分が胴部72よりも厚
肉で弧状の容器７を一次的成形する（第９図参照）。When the extension rod 62 is extended in such a state,
As shown in the figure, the preform 4 is stretched only at the side portion 42 between the held neck portion and the step portion 43, and the preform bottom portion 41 is cooled to about 15 ° C while maintaining the same thickness. Move up to 61 with the tip 63 of the draw rod. Further, since the side portion 42 is reduced in diameter and comes into contact with the rod along with the stretching, 8 to 10 kg / cm 2 of air is blown as the primary air during stretching. This blowing pressure is switched to a pressure of 25 Kg / cm 2 immediately after stretching, the preform 4 is expanded as a secondary air to the full extent of the cavity, and the main portion of the bottom portion 71 is thicker than the body portion 72 and the arc-shaped container 7 is formed. Primary molding is performed (see FIG. 9).
容器成形後、第10図に示すように、上記底型61を上昇
して厚肉の弧状底部71を、胴部72と一体で薄肉の外周壁
部を除き内方に押返す、弧状底部71の厚肉部分は軸方向
に未延伸の状態にあって、二軸方向の延伸を完了した薄
肉な胴部72とは異なり、空気圧により或程度延伸されて
いても、成形可能な熱量を有することから、底型61の押
圧力により半径方向に均一に延伸されるとともに、キャ
ビテイ面と底型との境にて折返されて凹入形状を呈し、
その折返し部分が環状の接地面73となる。After forming the container, as shown in FIG. 10, the bottom die 61 is raised to push the thick arc-shaped bottom portion 71 inward with the body portion 72 except the thin outer peripheral wall portion, and the arc-shaped bottom portion 71. The thick-walled part is not stretched in the axial direction, and unlike the thin-walled body 72 that has been stretched in the biaxial direction, it must have a heat amount that can be molded even if it is stretched to some extent by air pressure. From the above, while being uniformly stretched in the radial direction by the pressing force of the bottom die 61, it is folded back at the boundary between the cavity surface and the bottom die to present a concave shape,
The folded back portion serves as an annular contact surface 73.
この底型61による二次的成形により、一次成形された
容器７は、第３図に示す底部構造をは有するビン状の容
器、即ち、薄肉の外周壁部31の下端から内側に折返し形
成された内周壁部32と、内外周壁部の折返し部分に生じ
た環状接地面33と、内周壁部32の上部に連続して形成さ
れた底壁中央部34とからなり、かつ環状接地面33の外側
から底壁中央部34に及ぶ底面全体が、外周壁部31との境
に段部33を有する厚肉の容器底部を有する包装容器１に
完成される。By the secondary molding by the bottom mold 61, the container 7 primary molded is formed into a bottle-shaped container having a bottom structure shown in FIG. 3, that is, the thin outer peripheral wall portion 31 is folded inward from the lower end thereof. The inner peripheral wall portion 32, an annular grounding surface 33 formed at the folded portion of the inner and outer peripheral wall portions, and a bottom wall central portion 34 formed continuously on the upper portion of the inner peripheral wall portion 32, and of the annular grounding surface 33 The entire bottom surface extending from the outer side to the central portion 34 of the bottom wall is completed as the packaging container 1 having a thick container bottom having a step 33 at the boundary with the outer peripheral wall 31.
［発明の効果］ この発明は上述のように、容器底部を容器胴部に連な
る薄肉の外周壁部と、該外周壁部の下端から内側に折返
し形成された内周壁部と、内外周壁部の折返し部分に生
じた環状接地面と、内周壁部の上部に連続して形成され
た底壁中央部とから構成した上において、環状接地面の
外側から底壁中央部に及ぶ底面全体を、外周壁部との境
に段部を設けて略等しく厚肉に延伸形成したことから、
肉厚分布の不均一性から生じる落下強度の低下を防止で
き、また底面の主たる部分が二軸配向されているととも
に、環状接地面も含めて厚肉に形成されているため、内
部荷重はもとより大きな内圧にも耐え、炭酸飲料等を充
填した状態にて落下しても接地面が変形したり、または
容器底部が破損しするようなことがきわめて少くない。[Advantages of the Invention] As described above, the present invention includes a thin outer peripheral wall portion that connects the container bottom portion to the container body portion, an inner peripheral wall portion that is formed by folding back from the lower end of the outer peripheral wall portion to the inside, and an inner peripheral wall portion. It consists of an annular grounding surface that occurs at the folded portion and a bottom wall central part that is formed continuously on the top of the inner peripheral wall, and the entire bottom surface from the outside of the annular grounding surface to the bottom central part Since a step is provided on the boundary with the wall to form a substantially equally thick wall,
It is possible to prevent the drop strength from decreasing due to the non-uniformity of the wall thickness distribution.Because the main part of the bottom surface is biaxially oriented and the ring-shaped ground surface is also formed to be thick, not to mention the internal load. It withstands a large internal pressure, and it is extremely rare that the ground contact surface will be deformed or the bottom of the container will be damaged even if it falls while being filled with a carbonated beverage or the like.
また成形に際しては、予めは有底プリフオームの容器
底部成形部分を厚肉に成形し、その部分の延伸を胴部の
延伸の後に、底型により行なうことから、軸方向延伸時
に底部成形樹脂が他の部分に取られて樹脂量が不足する
ようなことがなく、常に確実に肉厚分布が略等し厚肉の
底面を形成することとができ、これにより容器底部各部
の肉厚分布を厳密に成形しなければ、充分な効果を得る
ことができない従来の耐圧性容器に比べて成形が容易と
なり、多数個を同時に成形する場合でも均質な製品を成
形することができ、成形ロスも少ないなどの利点を有す
る。When molding, the container bottom part of the bottomed preform is thickly molded in advance, and that part is stretched by the bottom mold after stretching the body part. It is possible to form a thick bottom surface without failing to prevent the resin amount from being taken up by the portion of the container and to ensure that the wall thickness distribution is approximately equal at all times. Molding is easier than conventional pressure-resistant containers that do not produce sufficient effect, and even when molding a large number of products at the same time, it is possible to form a homogeneous product with less molding loss. Have the advantage of.
図面はこの発明に係る耐圧性薄肉合成樹脂容器とその成
形方法とを示すもので、第１図は容器の一部縦断正面
図、第２図は容器底部の横断平面図、第３図は容器底部
の縦断面図、第４図は有底プリフオームの縦断面図、第
５図はプリフオーム底部の一部断面図、第６図から第10
図は成形工程を順に説明する縦断面図である。 １……耐圧性の容器、２……容器胴部 ３……容器底部、31……外周壁部 32……内周壁部 33……環状接地面、34……底部中央部 35……段部 ４……有底のプリフオーム 41……プリフオーム底部、42……側部、43……段部 ５……温調ポット、６……吹込金型 61……底型 62……延伸ロッド 63……先端部、64……係合縁 ７……一次成形容器 71……弧状底部The drawings show a pressure-resistant thin synthetic resin container according to the present invention and a molding method thereof. Fig. 1 is a partially longitudinal front view of the container, Fig. 2 is a cross-sectional plan view of the container bottom, and Fig. 3 is the container. Fig. 4 is a vertical cross-sectional view of the bottom, Fig. 4 is a vertical cross-sectional view of the bottom preform, and Fig. 5 is a partial cross-sectional view of the bottom of the preform.
The drawings are vertical cross-sectional views for sequentially explaining the molding process. 1 ... Pressure-resistant container, 2 ... Container body 3 ... Container bottom, 31 ... Outer wall 32 ... Inner wall 33 ... Annular ground plane, 34 ... Bottom center 35 ... Step 4 ... Bottom preform 41 ...... Preform bottom, 42 ... Side, 43 ... Step 5 ... Temperature control pot, 6 ... Blowing die 61 ... Bottom 62 ... Stretching rod 63 ... Tip, 64 …… Engagement rim 7 …… Primary molding container 71 …… Arc bottom
Claims (5)
ムを軸方向に延伸するとともに、空気圧により容器胴部
が薄肉で容器底部が弧状の容器を成形し、その弧状底部
を内方に押返して、容器底部を容器胴部に連なる薄肉の
外周壁部と、該外周壁部の下端から内側に折返し形成さ
れた内周壁部と、内外周壁部の折返し部分に生じた環状
接地面と、内周壁部の上部に連続して形成された底壁中
央部とから構成した薄肉合成樹脂容器において、 上記環状接地面の外側から底壁中央部に及ぶ底面全体
を、外周壁部との境に段部を設けて略等しく厚肉に形成
してなることを特徴とする耐圧性薄肉合成樹脂容器。1. A bottomed preform made of a thermoplastic synthetic resin is axially stretched, and a container body is thinned by air pressure to form a container having an arc-shaped bottom, and the arc-shaped bottom is pushed back inward. A thin outer peripheral wall portion connecting the bottom of the container to the body of the container, an inner peripheral wall portion formed by folding back from the lower end of the outer peripheral wall portion, an annular grounding surface formed at the folded portion of the inner and outer peripheral wall portions, and an inner peripheral wall In a thin-walled synthetic resin container composed of a central portion of the bottom wall formed continuously on the upper part of the portion, the entire bottom surface extending from the outside of the annular grounding surface to the central portion of the bottom wall is stepped at the boundary with the outer peripheral wall portion. A pressure-resistant thin-wall synthetic resin container characterized in that it is formed to have a substantially uniform thickness.
面全体の肉厚は、外周壁部の肉厚の略４倍である第１項
記載の耐圧性薄肉合成樹脂容器。2. The pressure-resistant thin-walled synthetic resin container according to claim 1, wherein the thickness of the entire bottom surface extending from the outside of the annular grounding portion to the center of the bottom wall is approximately four times the thickness of the outer peripheral wall portion.
ムの容器底部成形部分を、内側に段部を設けて他の部分
より厚肉に形成し、そのプリフオームを昇降自在な底型
を有する吹込金型内にて、段部より上方を軸方向に延伸
するとともに、空気圧により底部の主たる部分が胴部よ
りも厚肉で弧状の容器を一次的に成形し、その弧状底部
を上記底型により胴部と一体で薄肉の外周壁部を除き内
方に折返して、該外周壁部の下端から内側に折返し形成
された内周壁部と、内外周壁部の折返し部分に生じた環
状接地面と、内周壁部の上部に連続して形成された底壁
中央部とからなり、かつ環状接地面の外側から底壁中央
部に及び底面全体が、外周壁部との境に段部を有する厚
肉の容器底部に形成してなることを特徴とする耐圧性薄
肉合成樹脂容器の成形方法。3. A blow-in mold having a bottom mold for forming a bottomed preform container bottom portion made of a thermoplastic synthetic resin so as to be thicker than other portions by providing a step portion inside and forming the preform. In the mold, while extending axially above the step, the main part of the bottom part is primarily formed by air pressure to form an arc-shaped container whose wall thickness is thicker than the body part, and the arc-shaped bottom part is formed by the bottom mold. The inner peripheral wall part that is formed by folding back inward except the thin outer peripheral wall part that is integral with the inner part, and the inner peripheral wall part that is formed by being folded back inward from the lower end of the outer peripheral wall part; It is composed of a bottom wall center portion formed continuously on the upper portion of the peripheral wall portion, and from the outside of the annular grounding surface to the bottom wall center portion and the entire bottom surface, a thick wall having a step portion at the boundary with the outer peripheral wall portion. A pressure resistant thin synthetic resin container characterized by being formed on the bottom of the container. Form method.
向延伸は、先端部が段部より下側の容器底部成形部分に
適合する形状を有し、かつ先端部上に段部との係合縁を
有する延伸ロッドにより行なう第３項記載の耐圧性薄肉
合成樹脂容器の成形方法。4. The axial extension of the bottomed preform above the step portion has a shape such that the tip portion conforms to the molding portion of the container bottom portion below the step portion, and the step portion is formed on the tip portion. The method for molding a pressure-resistant thin-walled synthetic resin container according to claim 3, which is performed by using a stretch rod having an engaging edge.
向延伸は、容器吹込成形時の空気圧より低圧の空気圧の
吹込みの下に行なう第３項記載の耐圧性薄肉合成樹脂容
器の成形方法。5. The molding of a pressure-resistant thin synthetic resin container according to claim 3, wherein the axial extension above the stepped portion of the bottomed preform is carried out under the blowing of an air pressure lower than the air pressure at the time of blowing the container. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28433988A JPH085117B2 (en) | 1988-11-10 | 1988-11-10 | Pressure-resistant thin synthetic resin container and method of molding the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28433988A JPH085117B2 (en) | 1988-11-10 | 1988-11-10 | Pressure-resistant thin synthetic resin container and method of molding the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02128826A JPH02128826A (en) | 1990-05-17 |
| JPH085117B2 true JPH085117B2 (en) | 1996-01-24 |
Family
ID=17677294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28433988A Expired - Lifetime JPH085117B2 (en) | 1988-11-10 | 1988-11-10 | Pressure-resistant thin synthetic resin container and method of molding the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH085117B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5290506A (en) * | 1991-04-30 | 1994-03-01 | Nissei Asb Machine Co., Ltd. | Process of injection stretch blow molding hollow article having thick-walled bottom |
| JPH10305824A (en) * | 1995-10-31 | 1998-11-17 | Yoshino Kogyosho Co Ltd | Heat-resistant and pressure-resistant self-supporting type hollow container made of synthetic resin |
| ITMI20061922A1 (en) * | 2006-10-06 | 2008-04-07 | Gianfilippo Pagliacci | PREFORMATION OF REFINED PLASTIC MATERIAL. |
| CN103687713B (en) | 2011-07-20 | 2017-04-19 | 日精Asb机械株式会社 | Temperature control apparatus for preforms, temperature control method for preforms, resin container and method for producing resin container |
| JP6842651B2 (en) * | 2016-10-14 | 2021-03-17 | 大日本印刷株式会社 | Plastic container and container with contents |
| US10836531B2 (en) * | 2016-11-04 | 2020-11-17 | Pepsico, Inc. | Plastic bottle with a champagne base and production methods thereof |
| JP2019137453A (en) * | 2018-02-15 | 2019-08-22 | アサヒ飲料株式会社 | Round cylindrical plastic bottle |
| CN112088081A (en) | 2018-03-30 | 2020-12-15 | 日精Asb机械株式会社 | Blow molding method, blow mold, and blow molding apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3881621A (en) | 1973-07-02 | 1975-05-06 | Continental Can Co | Plastic container with noneverting bottom |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5579239A (en) * | 1978-12-13 | 1980-06-14 | Yoshino Kogyosho Co Ltd | Innprocess material for making bottole of twooaxissextended synthetic resin and method of using said material |
| SE429317B (en) * | 1980-05-29 | 1983-08-29 | Plm Ab | SETTING ASTADCOMMENDING ANY POLYETHYLTENE PREPARATE OR ITS LIKE THERMOPLASTIC MATERIAL AS A DEVICE FOR THIS |
| JPS609739A (en) * | 1983-06-30 | 1985-01-18 | 東洋製罐株式会社 | Multilayer oriented polyester bottle and manufacture thereof |
| US4725464A (en) * | 1986-05-30 | 1988-02-16 | Continental Pet Technologies, Inc. | Refillable polyester beverage bottle and preform for forming same |
-
1988
- 1988-11-10 JP JP28433988A patent/JPH085117B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3881621A (en) | 1973-07-02 | 1975-05-06 | Continental Can Co | Plastic container with noneverting bottom |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02128826A (en) | 1990-05-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2781810B2 (en) | Container for heated filling, manufacturing method thereof and intermediate molded product thereof | |
| US4927680A (en) | Preform and method of forming container therefrom | |
| US4785948A (en) | Blow molded plastic container having a reinforced wall structure and preform therefor | |
| JP5524688B2 (en) | Blow molding method for synthetic resin bottles | |
| EP3381651B1 (en) | Preform and method of manufacturing vessel | |
| JPH0622859B2 (en) | Container and intermediate products produced by stretch blow molding | |
| JPH04298304A (en) | Preform for thermal filling pressing vessel | |
| US4880593A (en) | Method for preparing blow molded plastic container | |
| JPH02258214A (en) | Production of vessel molding device and its apparatus | |
| JPH085117B2 (en) | Pressure-resistant thin synthetic resin container and method of molding the same | |
| JP3522370B2 (en) | Molding method and mold for heat-resistant container | |
| US4959006A (en) | Apparatus relating to a preform with geodesic reinforcement ring | |
| US11110643B2 (en) | Heat-resistant and biaxially stretched blow-molded plastic container having a base movable to accommodate internal vacuum forces | |
| JPH0761675B2 (en) | Plastic bottle manufacturing method | |
| WO2016059135A1 (en) | Preform having a variable thickness around a main axis | |
| JP2911557B2 (en) | Resin preform, biaxially stretch blow-molded container using the same, and method for producing the same | |
| JPH10146880A (en) | Production of bottle made of polyethylene terephthalate resin | |
| JPH10146879A (en) | Production of bottle made of polyethylene terephthalate resin | |
| JPH05254531A (en) | Pressure resisting self-standing container, method for production thereof and blow molding die thereof | |
| JP2560934B2 (en) | Plastic bottle manufacturing method | |
| JPH10139029A (en) | Extremely thin hollow container made of synthetic resin | |
| JP4289048B2 (en) | Two-stage blow molding method for heat-resistant bottles | |
| JP4087181B2 (en) | Method for producing synthetic resin container having inner rib at bottom and container produced using the same | |
| JP2003103607A (en) | Bottom structure of heat-resistant bottle | |
| JPS60229730A (en) | Manufacture of three-layer synthetic resin cylinder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090124 Year of fee payment: 13 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090124 Year of fee payment: 13 |