JPS636417B2 - - Google Patents
Info
- Publication number
- JPS636417B2 JPS636417B2 JP5144578A JP5144578A JPS636417B2 JP S636417 B2 JPS636417 B2 JP S636417B2 JP 5144578 A JP5144578 A JP 5144578A JP 5144578 A JP5144578 A JP 5144578A JP S636417 B2 JPS636417 B2 JP S636417B2
- Authority
- JP
- Japan
- Prior art keywords
- bottle
- piece
- stretch
- blow molding
- molded
- 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
Links
- 239000004743 Polypropylene Substances 0.000 claims description 40
- 239000000463 material Substances 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 25
- 229920005989 resin Polymers 0.000 claims description 16
- 239000011347 resin Substances 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 238000000071 blow moulding Methods 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- -1 polypropylene Polymers 0.000 claims description 7
- 229920001155 polypropylene Polymers 0.000 claims description 7
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 8
- 238000000465 moulding Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010000 carbonizing Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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—Rigid or semi-rigid 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 or 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
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ポリプロピレン樹脂製延伸成形壜体
の成形方法に関するもので、さらに詳言すれば、
より高い透明性を有するポリプロピレン樹脂製延
伸成形壜体を得ることを目的としたものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for forming a stretch-molded bottle made of polypropylene resin, and more specifically,
The purpose of this invention is to obtain a polypropylene resin stretch-molded bottle having higher transparency.
透明性のある合成樹脂製壜体としては、一般に
塩化ビニール樹脂製壜体が知られている。
As a transparent synthetic resin bottle, a vinyl chloride resin bottle is generally known.
しかしながら、塩化ビニール樹脂製壜体は、使
用後の廃棄物処理とかモノマによる衛生上の問題
等で使用されることが少なくなりつつなる。 However, the use of vinyl chloride resin bottles is decreasing due to waste disposal after use and hygienic problems caused by monomers.
この塩化ビニール樹脂に代わる合成樹脂製壜体
の成形材料として、モノマによる衛生上の問題お
よび廃棄物処理上の問題のないポリプロピレン樹
脂（以下、単にPPと記す）が知られている。 Polypropylene resin (hereinafter simply referred to as PP) is known as a molding material for synthetic resin bottles in place of vinyl chloride resin, which is free from hygienic problems and waste disposal problems caused by monomers.
しかしながら、PP製壜体は、塩化ビニール樹
脂製壜体に比べてその透明性が大幅に劣つている
と共に、壜体としての機械的強度も劣つていると
云う欠点を持つている。 However, PP bottles have the drawbacks of being significantly inferior in transparency and mechanical strength as compared to vinyl chloride resin bottles.
このPP製壜体のもつ塩化ビニール樹脂製壜体
に対する劣等点を改良する手段として、PP製壜
体を延伸成形方法により成形する手段がある。 As a means of improving the inferiority of the PP bottle compared to the vinyl chloride resin bottle, there is a method of forming the PP bottle by a stretch molding method.
PP製壜体を延伸ブロー成形すると、壜体を成
形しているPP材料が配向結晶することになり、
これによつて透明性、機械的強度、そしてガスバ
リヤー性が高められることになり、壜体として優
れたものとなる。 When stretch-blow molding a PP bottle, the PP material forming the bottle becomes oriented and crystallized.
This improves transparency, mechanical strength, and gas barrier properties, making it an excellent bottle.
確かに、延伸ブロー成形されたPP製壜体は、
塩化ビニール樹脂製壜体と比べて同程度の機械的
強度とそしてガスバリヤー性を発揮するものとな
るのであるが、透明性の向上は認められず、かな
り劣つたものとなつている。
Indeed, stretch-blow molded PP bottles are
Although it exhibits mechanical strength and gas barrier properties comparable to those of vinyl chloride resin bottles, no improvement in transparency was observed and the bottle was considerably inferior.
従来、このPP製延伸成形壜体（以下、単に壜
体と記す）の、塩化ビニール樹脂製壜体に比べて
の透明性の悪さの原因が一体どこにあるのかは全
く不明であり、PP材料そのものの物性によるも
のと考えられていた。 Until now, it was completely unclear what was the cause of the poor transparency of stretch-molded PP bottles (hereinafter simply referred to as bottles) compared to vinyl chloride resin bottles, and the PP material itself It was thought that this was due to the physical properties of
本発明者は、この壜体の透明性の悪さの原因を
解明すべく、多くの実験と測定とを繰り返したと
ころ、その原因は壜体内面に付形される多数の細
かい筋にあることをつきとめた。この壜体内面に
付形される多数の細かい筋は、成形樹脂材料であ
るPP材料相互間に生じる歪によつて機械的に成
形されるものであることが判つた。 The inventor of the present invention repeated many experiments and measurements in order to elucidate the cause of the poor transparency of the bottle, and found that the cause lies in the large number of fine lines formed on the inner surface of the bottle. I found out. It was found that the many fine lines formed on the inner surface of the bottle were formed mechanically by the strain generated between the PP materials used as the molding resin material.
すなわち、PP材料で、例えば第１図に示した
ような壜体Ｂを延伸ブロー成形するための一次成
形品である第２図に示したようなピースＰを射出
成形するに際して、金型内に溶融したPP材料を
射出すると、冷却状態にある金型成形型面に接触
するPP材料は早期に冷却硬化するのに対し、成
形空間の中央部分に位置するPP材料の冷却硬化
には或る程度の時間を要することになり、この表
面部分と内部との間での冷却速度の相違と、射出
されたPP材料の流動力とにより、成形されるピ
ースＰの内面Ｐ１部分に歪によつて機械的に多数
の細かい筋Ｐ２（第４図参照）が成形されること
になるのである。 That is, when injection molding a piece P as shown in Fig. 2, which is a primary molded product for stretch-blow molding a bottle B as shown in Fig. 1, using PP material, there is a When molten PP material is injected, the PP material in contact with the mold surface in the cooling state cools and hardens quickly, whereas the PP material located in the center of the molding space cools and hardens to a certain extent. Due to the difference in cooling rate between the surface portion and the inside, and the flow force of the injected PP material, the inner surface P1 portion of the piece P to be molded may be strained by the machine. Therefore, a large number of fine lines P2 (see FIG. 4) are formed.
より詳しく説明するならば、金型の成形型面表
面に接触してすでに延伸変形が可能な温度以下に
冷却硬化されたPP材料の一部分が、まだ冷却硬
化していないPP材料の流動力により強引にPP材
料の流れ方向に移動させられ、隣接した他の冷却
硬化したPP材料部分から強引に引き離され、こ
の引き離された部分の移動により、内面Ｐ１表面
に引つ掻き傷状の多数の細かい筋Ｐ２を成形して
しまうのである。事実、内面Ｐ１に付形される多
数の細かい筋Ｐ２は、ピースＰを成形するPP材
料の流れ方向に沿つて形成されている。 To explain in more detail, a part of the PP material that has come into contact with the mold surface of the mold and has already been cooled and hardened below the temperature at which stretching deformation is possible is forced by the flow force of the PP material that has not yet cooled and hardened. The PP material is moved in the flow direction and forcibly separated from other adjacent cooled and hardened PP material parts, and the movement of this separated part causes many fine scratch-like streaks on the inner surface P1. This ends up molding P2. In fact, a large number of fine lines P2 formed on the inner surface P1 are formed along the flow direction of the PP material forming the piece P.
このピースＰの内面Ｐ１に付形された多数の細
かい筋Ｐ２は、ピースＰを壜体Ｂに２軸延伸ブロ
ー成形したとしても消えることは全くなく、第５
図に示した壜体Ｂの内面Ｂ１の拡大図に示すよう
に、そのまま成形品である壜体Ｂの内面Ｂ１に延
びた状態で筋２Ｂとして位置し、透過光線を乱反
射して壜体Ｂの透明性を低下させるものである。 The numerous fine lines P2 formed on the inner surface P1 of this piece P do not disappear at all even if the piece P is biaxially stretch blow molded into the bottle B.
As shown in the enlarged view of the inner surface B1 of the bottle B shown in the figure, the stripes 2B are positioned as they extend on the inner surface B1 of the bottle B, which is a molded product, and diffusely reflect the transmitted light. This reduces transparency.
このため、本発明は、PP製延伸成形壜体Ｂの
内面Ｂ１に付形される多数の細かい筋Ｂ２を消滅
させて壜体Ｂの内面Ｂ１を平滑にすることをその
技術的課題としている。 Therefore, the technical object of the present invention is to eliminate the many fine lines B2 formed on the inner surface B1 of the stretch-molded bottle B made of PP, thereby making the inner surface B1 smooth.
以下、本発明を本発明の実施例を示す図面を参
照しながら説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to drawings showing embodiments of the invention.
本発明の手段は、
PP製の延伸成形壜体Ｂの成形方法に関するも
のであること、
有底または無底円筒形状に成形された一次成形
品であるピースＰの内面Ｐ１を、PP材料の融点
である約170〜220℃まで約30秒で急速加熱する急
速加熱処理工程を有すること、
この急速加熱処理の施されたピースＰの内面Ｐ
１を４〜５秒以内に90℃以下まで急冷する急冷処
理工程を有すること、
内面Ｐ１を急冷処理されたピースＰを加熱ブロ
ー成形操作により壜体Ｂに成形する延伸ブロー成
形処理工程を有すること、
急冷処理は、急速加熱処理の施された内面Ｐ１
の温度がPP材料の融点以下に低下しない内に実
施されること、
この急速加熱処理工程と急冷処理工程と延伸ブ
ロー成形処理工程と順に施すこと、にある。 The means of the present invention relates to a method for forming a stretch-molded bottle B made of PP, and the inner surface P1 of the piece P, which is a primary molded product formed into a bottomed or bottomless cylindrical shape, is set to the melting point of the PP material. The inner surface P of the piece P that has been subjected to this rapid heating treatment has a rapid heating treatment step that rapidly heats the piece P to approximately 170 to 220°C in approximately 30 seconds.
1 to 90°C or less within 4 to 5 seconds, and a stretch blow molding process to mold the piece P, whose inner surface P1 has been rapidly cooled, into a bottle B by a heating blow molding operation. , The rapid cooling treatment is performed on the inner surface P1 that has been subjected to the rapid heating treatment.
The rapid heating treatment step, the rapid cooling treatment step, and the stretch blow molding treatment step are performed in order.
ピースＰの内面Ｐ１をPP材料の融点まで３０
秒で急速加熱するのは、この加熱速度が遅いと、
この加熱操作により溶融状態となる部分が内面Ｐ
１表面部分に限定されずに、内面Ｐ１の比較的内
部まで溶融状態となつてしまい、このためピース
Ｐの形状を不正変形させてしまう不都合を生じる
危険があると共に、溶融状態となつた部分全域を
良好に急冷硬化させることができなくなるからで
ある。また、前記した加熱速度が30秒よりも大幅
に早いと、内面Ｐ１のPP材料が炭化する不都合
が生じる。要するに、内面Ｐ１に対する急速加熱
は、内面Ｐ１表面部分のPP材料を炭化させるこ
となしに、できる限り短い時間で溶融状態にすれ
ば良いのである。 The inner surface P1 of the piece P is 30° to the melting point of the PP material.
The reason for rapid heating in seconds is that if this heating rate is slow,
The part that becomes molten due to this heating operation is the inner surface P
The molten state is not limited to only one surface part, but also relatively to the inside of the inner surface P1, and there is a risk that the shape of the piece P may be improperly deformed. This is because it becomes impossible to rapidly cool and harden the material. Furthermore, if the heating rate described above is much faster than 30 seconds, there will be a problem that the PP material on the inner surface P1 will be carbonized. In short, the rapid heating of the inner surface P1 can be carried out to melt the PP material in the shortest possible time without carbonizing the PP material on the surface of the inner surface P1.
また、急速加熱処理された内面Ｐ１を４〜５秒
以内に90℃以下まで急冷するのは、溶融状態とな
つた内面Ｐ１表面部分のPP材料を、冷却の進行
に伴つて内部の歪による変形が内面Ｐ１表面に現
れる時間的余裕を与えることなしに、できる限り
急速に冷却硬化させるためである。 In addition, rapidly cooling the rapidly heated inner surface P1 to 90℃ or less within 4 to 5 seconds causes the PP material on the surface of the inner surface P1, which is in a molten state, to deform due to internal strain as cooling progresses. This is to cool and harden the material as quickly as possible without giving time for it to appear on the inner surface P1.
さらに、急冷処理を内面Ｐ１の温度がPP材料
の融点以下に低下しない内に実施するのは、内面
Ｐ１に対して確実に急冷処理を施すことができる
ようにするためである。 Furthermore, the reason why the quenching treatment is performed before the temperature of the inner surface P1 falls below the melting point of the PP material is to ensure that the quenching treatment can be performed on the inner surface P1.
要するに、本発明方法は、射出もしくは押出し
成形されたPP製のピースＰの内面Ｐ１を、PP材
料の融点まで急速加熱することにより、この内面
Ｐ１表面部分のPP材料を溶融状態として高い流
動性を与え、この高い流動性が与えられた内面Ｐ
１表面部分のPP材料自身が発揮する表面張力の
作用により、この内面Ｐ１表面に成形されていた
引つ掻き傷状の筋Ｐ２を消滅させると共に、内面
Ｐ１表面全域を、その内部に発生している歪に関
係なしに極めて平滑なものとし、この状態のまま
内面Ｐ１表面部分を急冷して冷却硬化させること
により、内面Ｐ１表面を平滑面とし、このように
して内面Ｐ１表面を平滑面に成形されたピースＰ
を延伸ブロー成形処理により壜体Ｂに成形するこ
とにより、内面Ｂ１の平滑な壜体Ｂを得ることが
できるのである。 In short, the method of the present invention rapidly heats the inner surface P1 of an injection or extrusion molded PP piece P to the melting point of the PP material, thereby melting the PP material on the surface of the inner surface P1 and achieving high fluidity. The inner surface P given this high fluidity
Due to the action of the surface tension exerted by the PP material itself on the first surface part, the scratch-like streaks P2 formed on the surface of the inner surface P1 disappear, and the entire surface of the inner surface P1 is scratched. The inner surface P1 is made extremely smooth regardless of the strain, and the inner surface P1 is made to be a smooth surface by rapidly cooling and cooling hardening the inner surface P1 in this state, and in this way, the inner surface P1 is formed into a smooth surface. piece P
By forming it into a bottle B by stretch blow molding, it is possible to obtain a bottle B with a smooth inner surface B1.
このようにして成形された壜体Ｂは、その内面
Ｂ１が極めて平滑であるので、この内面Ｂ１での
透過光線の乱反射が大幅に減少することになり、
これによつて成形された壜体Ｂの透明性は飛躍的
に向上することになる。 Since the bottle B formed in this way has an extremely smooth inner surface B1, diffuse reflection of transmitted light rays on this inner surface B1 is greatly reduced.
As a result, the transparency of the molded bottle B is dramatically improved.
射出成形機にてシリンダー温度をホツパー側よ
り175℃、180℃、200℃にセツトし、射出圧40
Kg／cm2、金型温度16〜23℃の条件にて、内径20
mm、肉厚６mmそして長さ91mmの第２図に示すよう
な有底パリソンであるピースＰを成形した。
In the injection molding machine, the cylinder temperature was set to 175℃, 180℃, and 200℃ from the hopper side, and the injection pressure was 40℃.
Kg/ cm2 , mold temperature 16~23℃, inner diameter 20
A piece P, which is a parison with a bottom as shown in FIG. 2, was molded with a thickness of 6 mm, a wall thickness of 6 mm, and a length of 91 mm.
次いで、第３図に示すように、外径12mmのイン
フラヒータ１を立設固定したガイド２に、内面Ｐ
１全域をヒータ１にほぼ均一に対向位置させるよ
うにピースＰを嵌合組付けし、ヒータ１表面温度
を350〜400℃にセツトしてピースＰを回転させな
がら25〜30秒間内面Ｐ１に対する急速加熱を実施
し、急速加熱処理後、ただちにピースＰをガイド
２から取り外して約20〜25℃の水に侵漬して急冷
を行つた。 Next, as shown in FIG.
The piece P is fitted and assembled so that the entire area of the heater 1 is positioned almost uniformly opposite the heater 1, and the surface temperature of the heater 1 is set to 350 to 400℃, and while rotating the piece P, the inner surface P1 is rapidly heated for 25 to 30 seconds. Heating was performed, and after the rapid heating treatment, the piece P was immediately removed from the guide 2 and immersed in water at about 20 to 25°C to perform rapid cooling.
急冷後、水分を除去したピースＰを延伸ブロー
成形機の治具に装填し、回転させた状態で加熱炉
に入れ、ピースＰの加熱を行つた。加熱条件は、
150℃、４分間で、加熱されたピースＰを延伸ブ
ロー部分に移し、約60℃に加熱されたブロー金型
内で圧縮気体圧10Kg／cm2以上の設定で延伸ブロー
を行つた。得られた壜体Ｂは、口部から首部にか
けての外径が30mm、内径が26mm、高さが15mm、胴
中央部は長径が67mm、短径が44mm、胴下部は長径
が92mm、短径が62mm、胴部の肉厚は0.5mm、胴部
の高さは230mmの楕円壜体であり、内面Ｂ１が第
６図に示すように全く筋Ｂ２のない平滑面となつ
て透明性のある、そしてブロー金型の形状に合致
した再現性の良い壜体が得られた。 After quenching, the piece P from which water had been removed was loaded into a jig of a stretch blow molding machine, and placed in a heating furnace while being rotated, to heat the piece P. The heating conditions are
The heated piece P was transferred to a stretch-blowing section at 150°C for 4 minutes, and stretch-blowing was performed in a blow mold heated to about 60°C at a compressed gas pressure of 10 kg/cm 2 or more. The obtained bottle B has an outer diameter of 30 mm from the mouth to the neck, an inner diameter of 26 mm, and a height of 15 mm.The central part of the body has a major axis of 67 mm and a minor axis of 44 mm.The lower part of the body has a major axis of 92 mm and a minor axis. It is an elliptical bottle with a diameter of 62 mm, a body wall thickness of 0.5 mm, and a body height of 230 mm, and the inner surface B1 is a smooth surface with no streaks B2 as shown in Figure 6, making it transparent. , and a bottle with good reproducibility that matched the shape of the blow mold was obtained.
なお、実験によれば、ピースＰの内面Ｐ１に対
して急速加熱処理を施した後、そのままピースＰ
を放置して徐冷（ほぼ毎分の降温が50℃程度の冷
却速度の冷却を意味している。）状態とすると、
多数の細かい筋Ｐ２は、その規則的な筋としての
形態から、第７図に示すように、内部の歪の影響
にりより不規損な凹凸面となり、その凹凸程度が
大きくなる結果となつた。このように、内面Ｐ１
に対する急速加熱処理後、このピースＰを徐冷状
態とすると、引つ掻き傷状の筋Ｐ２を消滅させる
ことができる代わりに、内面Ｐ１は、円滑である
が細かい凹凸のある表面となり、成形される壜体
Ｂの透明性を向上させることはできなかつた。 According to experiments, after performing rapid heating treatment on the inner surface P1 of the piece P, the piece P
If it is left to cool slowly (meaning cooling at a cooling rate of about 50℃, where the temperature decreases approximately every minute),
As shown in FIG. 7, the many fine lines P2 form an irregularly uneven surface due to the influence of internal distortion due to their regular line shape, resulting in an increase in the degree of the unevenness. Ta. In this way, the inner surface P1
When this piece P is slowly cooled after rapid heating treatment, the scratch-like streaks P2 can disappear, but the inner surface P1 becomes a smooth but finely uneven surface, and the molding becomes difficult. However, it was not possible to improve the transparency of Bottle B.
以上の説明から明らかなごとく、本発明は、塩
化ビニール樹脂性壜体と同程度の透明性を有する
ポリプロピレン樹脂製延伸ブロー成形壜体を得る
ことができ、またその操作も延伸ブロー成形のた
めの加熱処理の前に内面に対する急速加熱処理と
急冷処理とを施すだけで良いので、その実施が容
易であり、また各処理工程は単独にそして順に行
えば容易ので、その操作が容易である等優れた効
果を発揮するものである。
As is clear from the above description, the present invention makes it possible to obtain a polypropylene resin stretch-blow-molded bottle having the same degree of transparency as a vinyl chloride resin bottle, and the operation thereof is also suitable for stretch-blow-molding. It is easy to carry out because it is only necessary to perform rapid heating treatment and rapid cooling treatment on the inner surface before heat treatment, and each treatment step can be performed individually or in sequence, so it is easy to operate. It has the following effects.
第１図は、本発明方法により成形された壜体の
一例を示す一部破断した正面図である。第２図
は、本発明方法の実施されるピースの一例を示す
一部破断した正面図である。第３図は、本発明方
法の急速加熱処理を実施すべく構成された加熱装
置の一例を示す一部破断した正面図である。第４
図は、射出成形されただけのピース内面の一部拡
大図である。第５図は、従来の壜体内面の拡大図
である。第６図は、本発明方法を実施して成形さ
れた壜体内面の拡大図である。第７図は、急速加
熱処理した後徐冷した場合のピース内面の拡大図
である。
符号の説明、１；ヒータ、２；ガイド、Ｐ；ピ
ース、Ｐ１；内面、Ｐ２；筋、Ｂ；壜体、Ｂ１；
内面、Ｂ２；筋。
FIG. 1 is a partially cutaway front view showing an example of a bottle molded by the method of the present invention. FIG. 2 is a partially cutaway front view showing an example of a piece on which the method of the present invention is carried out. FIG. 3 is a partially cutaway front view showing an example of a heating device configured to carry out the rapid heating process of the method of the present invention. Fourth
The figure is a partially enlarged view of the inner surface of a piece that has just been injection molded. FIG. 5 is an enlarged view of the inner surface of a conventional bottle. FIG. 6 is an enlarged view of the inner surface of a bottle formed by carrying out the method of the present invention. FIG. 7 is an enlarged view of the inner surface of the piece when it is slowly cooled after rapid heating treatment. Explanation of symbols, 1; Heater, 2; Guide, P; Piece, P1; Inner surface, P2; Strain, B; Bottle, B1;
Inner surface, B2; muscle.
Claims (1)
形品であるピースＰの内面Ｐ１をポリプロピレン
樹脂材料の融点である約170〜220℃まで約30秒で
急速加熱する急速加熱処理工程と、該急速加熱処
理した内面Ｐ１を、該内面Ｐ１の温度がポエプロ
ピレン樹脂材料の融点以下に低下しない内に４〜
５秒以内に90℃以下まで急冷する急冷処理工程
と、 前記内面Ｐ１を急冷処理されたピースＰを加熱
ブロー成形操作により壜体Ｂに成形する延伸ブロ
ー成形処理工程と、 を有し、前記急速加熱処理工程と急冷処理工程
と延伸ブロー成形処理工程とを順に施すポリプロ
ピレン樹脂製延伸成形壜体の成形方法。[Claims] 1. Rapid heating of the inner surface P1 of the piece P, which is a primary molded product shaped into a bottomed or bottomless cylindrical shape, to about 170 to 220°C, which is the melting point of the polypropylene resin material, in about 30 seconds. In the heat treatment step, the rapidly heat-treated inner surface P1 is heated to 4 to 40 ml while the temperature of the inner surface P1 does not fall below the melting point of the polypropylene resin material.
a quenching step of rapidly cooling to 90° C. or less within 5 seconds; and a stretch blow molding step of forming the piece P whose inner surface P1 has been quenched into a bottle B by a heating blow molding operation. A method for forming a polypropylene resin stretch-molded bottle, which sequentially performs a heat treatment process, a quenching treatment process, and a stretch blow molding treatment process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5144578A JPS54144280A (en) | 1978-04-28 | 1978-04-28 | Extended and shaped bottle made of polypropylene resin and method of shaping said bottle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5144578A JPS54144280A (en) | 1978-04-28 | 1978-04-28 | Extended and shaped bottle made of polypropylene resin and method of shaping said bottle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54144280A JPS54144280A (en) | 1979-11-10 |
| JPS636417B2 true JPS636417B2 (en) | 1988-02-09 |
Family
ID=12887121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5144578A Granted JPS54144280A (en) | 1978-04-28 | 1978-04-28 | Extended and shaped bottle made of polypropylene resin and method of shaping said bottle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54144280A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007043279A1 (en) * | 2005-10-11 | 2007-04-19 | Toyo Seikan Kaishya, Ltd. | Preform cooling apparatus and method of preform cooling |
| JP2007130993A (en) * | 2005-10-11 | 2007-05-31 | Toyo Seikan Kaisha Ltd | Preform cooling device/method for cooling preform |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6277919A (en) * | 1985-10-01 | 1987-04-10 | Mitsubishi Plastics Ind Ltd | Blow molding method for bottle |
| JP2004136486A (en) * | 2002-10-16 | 2004-05-13 | Dainippon Printing Co Ltd | In-mold label molding label, in-mold label biaxially stretched blow molded product, and method for producing the same. |
-
1978
- 1978-04-28 JP JP5144578A patent/JPS54144280A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007043279A1 (en) * | 2005-10-11 | 2007-04-19 | Toyo Seikan Kaishya, Ltd. | Preform cooling apparatus and method of preform cooling |
| JP2007130993A (en) * | 2005-10-11 | 2007-05-31 | Toyo Seikan Kaisha Ltd | Preform cooling device/method for cooling preform |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54144280A (en) | 1979-11-10 |
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