JPH03272826A - Blow molding process - Google Patents
Blow molding processInfo
- Publication number
- JPH03272826A JPH03272826A JP2074228A JP7422890A JPH03272826A JP H03272826 A JPH03272826 A JP H03272826A JP 2074228 A JP2074228 A JP 2074228A JP 7422890 A JP7422890 A JP 7422890A JP H03272826 A JPH03272826 A JP H03272826A
- Authority
- JP
- Japan
- Prior art keywords
- parison
- cavity
- mold
- compressed air
- blow molding
- 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.)
- Pending
Links
- 238000000071 blow moulding Methods 0.000 title claims abstract description 31
- 238000000465 moulding Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 238000007664 blowing Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 235000014653 Carica parviflora Nutrition 0.000 description 1
- 241000243321 Cnidaria Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 235000019993 champagne Nutrition 0.000 description 1
- ZPUCINDJVBIVPJ-LJISPDSOSA-N cocaine Chemical compound O([C@H]1C[C@@H]2CC[C@@H](N2C)[C@H]1C(=O)OC)C(=O)C1=CC=CC=C1 ZPUCINDJVBIVPJ-LJISPDSOSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はプラスチック成形品０ブロー成形方法に関する
。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a zero-blow molding method for plastic molded products.
（従来の技術）
従来、プラスチック成形品を成形するどきに用いられる
ブロー成形ぞは、押出機から所定長さのパリソンを押し
出し、このパリソンを型開きした金製のキャビティを形
成する空間に位置させ、金型を型締めし２てパリソン土
部を切断するヒ共にパリソン下部を融着し、パリソンを
くわえた金型を圧縮空気供給ノズル側に移動させ、パリ
ソン」二部の開口部（、二二〇圧縮空気供給ノズルを挿
入して圧縮空気をパリソン内に充填する方法が知られて
いる。(Prior art) Conventionally, a blow molding channel used when molding plastic molded products extrudes a parison of a predetermined length from an extruder, and positions this parison in a space that forms an open metal cavity. After clamping the mold and cutting the soil part of the parison, the lower part of the parison is fused together, and the mold with the parison in its mouth is moved to the compressed air supply nozzle side, and the opening in the second part of the parison (2) is fused. 20 A known method is to insert a compressed air supply nozzle and fill the parison with compressed air.
（発明が解決しＪうとする課！！す
しかしながら、このようなブロー成形方法により成形品
を成形する場合、金型の型締め時に形成される成形品形
成空間としてのキャビティの形成壁部が平滑面であると
、ブロー成形の時に膨張するパリソンがキャビティ形成
壁面に密着してパリソンとキャビティ形成壁面との間に
空気がたまってしまい、成形品の外表面にこの空気溜り
の跡が凹部として残る不Ｊ１．６がある。(This is a problem that the invention attempts to solve!! However, when molding a molded product using such a blow molding method, the forming wall of the cavity, which is the molded product forming space formed when the mold is clamped, is smooth. If it is a flat surface, the parison that expands during blow molding will stick tightly to the cavity forming wall, causing air to accumulate between the parison and the cavity forming wall, leaving traces of this air pocket as a recess on the outer surface of the molded product. There is a non-J1.6.
そごで、ブロー成形金型のキャビティ形成壁面には、キ
ャビティ形成壁面たパリソンとの間に空気温りが出来な
翻）ように空気を逃すことが出来る程度の粗さが設けら
れでいる。The cavity-forming wall surface of the blow molding mold is provided with a roughness that allows air to escape so as to prevent air temperature from forming between the cavity-forming wall surface and the parison.
従って、従来のブロー成形では外表面の光沢度の少ない
成形品しか出来ないという不具合があった。Therefore, conventional blow molding has the disadvantage that only molded products with low gloss on the outer surface can be produced.
（発明の目的）
本発明は上記課題に着目してなきれたもので、ブロー成
形であっても外表面の光沢度の高い成形品を形成できる
ブロー成形方法を提供することを目的ヒする。(Object of the Invention) The present invention was developed in view of the above-mentioned problems, and an object of the present invention is to provide a blow molding method that can form a molded product with a high gloss on the outer surface even when blow molding is performed.
（課題を解決するためσ）手段）
上記課題を解決するために、本発明にかかるブロー成形
方法は、型締めしたＬきに成形品形成空間としてのキャ
ビティが形成される金型のキャビティ形成壁面の中心線
平均粗さを０．２５μｍ以下に設定し、前記金型を型締
めするときに前記キャビティにブロー成形用のパリソン
を位置させた後、少なくヒもこのパリソンに圧縮空気を
充填する以前に、このパリソンの外部にある前記キャビ
ティ丙の空気を吸引しつつ、前記圧縮空気を前記パリソ
ンに充填して成形品を形成するこ辷を特徴とする。(σ) Means for Solving the Problems In order to solve the above problems, the blow molding method according to the present invention uses a cavity forming wall surface of a mold in which a cavity as a molded product forming space is formed when the mold is clamped. The average roughness of the center line of the mold is set to 0.25 μm or less, and after the parison for blow molding is positioned in the cavity when the mold is clamped, the parison is filled with compressed air. The molded article is formed by filling the parison with the compressed air while sucking the air in the cavity C outside the parison.
（作 用）
本発明にかかるブ〔７−成形方法り二よれば、ブローの
始まる前にキャビティ丙の空気を涜極的に吸引するので
、パリソンとキャビティ形ｔｉ、壁面との間（：９気が
たまらない８ 従って、キャビティ形成壁面を光沢度の
高い平滑面とするごとが出来る二εとなり、成形品の外
表（２）の光沢度を高めることが出来る。(Function) According to the blow [7-molding method method 2] according to the present invention, the air in the cavity C is extremely sucked before the blowing starts, so that the space between the parison, the cavity shape ti, and the wall surface (:9 8 Therefore, the cavity forming wall surface can be made into a smooth surface with high gloss, and the gloss of the outer surface (2) of the molded product can be increased.
（実施例）
以下、本発明の実施例にかかるブロー成形方法を図面を
参照にしつ二゛〕説明する。(Example) Hereinafter, a blow molding method according to an example of the present invention will be described with reference to the drawings.
先ず、本実施例ｉ、：かかるブロー成形方法に用いるブ
ロー成形金型（以下の実施例の説明では単に金型という
）を説明する。第２図はこの金型を図示したもので、金
型１は、第３図に示すように、他の金型２ヒ型締めされ
た時に金ｆｆ４Ｌ ２の間にキャビティ３が形成され
る。金型２の構成は金型１の構成と同様であるので、金
型１の説明を援用する。First, Example I: A blow molding mold (simply referred to as a mold in the following description of the example) used in this blow molding method will be described. FIG. 2 shows this mold, and as shown in FIG. 3, when the mold 1 is clamped with the other mold 2, a cavity 3 is formed between the molds ff4L2. Since the configuration of the mold 2 is similar to that of the mold 1, the description of the mold 1 will be referred to.
金型１．２間ト、は散締め前にパリソン４（第５図〜・
第７図参照）がｔｊ！、給される。このパリソン４は４
を珊タイプ又は積層タイプのものが用いられ、最外贋は
、例えば、ポリエチレン、ポリプロピレン、ボリブデン
などの樹胞ヒされる。For 1.2 hours of the mold, the parison 4 (Fig.
(see Figure 7) is tj! , will be paid. This parison 4 is 4
A coral type or a laminated type is used, and the outermost one is made of resin such as polyethylene, polypropylene, or bolybdenum.
金型１．２は、例えばアルミニウム若（１，りは炭素鋼
等からなり、金ｆｉｔの金型２と密着するバー・ティン
グ面１ａには型締め時にキャビアイ３を形成する凹部５
が形成されている、本発明には、この四部（）の壁面を
キャビティ形成壁面５＆として（１する。キャビティ形
成壁面５ａの中心線平均粗さ（ＪＩＳ Ｂ （＋６０１
−１８８２）は０．２５１ｔｎ＋以下に設定する、バー
、ティング面１ａには四部５の周囲を囲むように吸引用
凹部６．７が形成される。この吸引用凹部６゜７は型締
め状態の金型１．２の境界部に空気吸引孔８゜８を形成
する。吸引用凹部６．７の底部には金型１゜２の外方に
通ずる連通孔９、】０が関口されている。The mold 1.2 is made of, for example, aluminum or carbon steel, and the bar ring surface 1a that comes into close contact with the metal mold 2 has a recess 5 that forms a caviar eye 3 when the mold is clamped.
In the present invention, the wall surfaces of these four parts () are defined as (1) as the cavity forming wall surface 5&.The centerline average roughness of the cavity forming wall surface 5a (JIS B (+601
-1882) is set to 0.251tn+ or less.A suction recess 6.7 is formed in the bar and ring surface 1a so as to surround the four parts 5. This suction recess 6.7 forms an air suction hole 8.8 at the boundary of the mold 1.2 in the clamped state. The bottom of the suction recess 6.7 is provided with a communication hole 9, which communicates with the outside of the mold 1.
この連通孔９．１０には、金型１．２の外方に配設され
る空気吸引子段１１が接続される（第４図参照）。連通
孔９．１０の開口部には焼結金属からなる栓１２．１２
が嵌着されている。栓】２、】５２の焼結金属粒子間に
は空気を通過さセる隙間が設けられている。吸引用凹部
６．７とキャビティ形成用の四部５との間には底の浅い
溝６ａ、 ？ａが形成されている。この溝６ａ、 ７ａ
は９気吸引孔８．８の一部を構成するもの７．；、瑣締
め時にキャビティ３と空気吸引孔８．８とを連通させて
キャビラーイ３から空気を吸引する。溝６ａ、 ７ａは
圧縮空気り・パリソン４内に吹き込んだ時に膨張するパ
リソン４が進入しない程度の深さを有しで６する。An air suction element stage 11 disposed outside the mold 1.2 is connected to this communication hole 9.10 (see FIG. 4). A plug 12.12 made of sintered metal is provided at the opening of the communication hole 9.10.
is fitted. A gap is provided between the sintered metal particles of plugs ]2 and ]52 to allow air to pass therethrough. There is a shallow groove 6a between the suction recess 6.7 and the four cavity forming parts 5, ? a is formed. These grooves 6a, 7a
7. constitutes a part of the 9 air suction hole 8.8. (4) When tightening, the cavity 3 and the air suction hole 8.8 are communicated with each other to suck air from the cavity 3. The grooves 6a and 7a are deep enough to prevent the expanded parison 4 from entering when the compressed air is blown into the parison 4.
凹部５の−Ｌ端部は、押出機（図）■り省略）から切り
放されたパリソン４を保持すると共に、二のパリソン４
の辷端部を介して圧縮空気供給ノズル２１を保持；７得
るようになっている。又、凹部５の下端部には、押出機
から供給されるパリソン４の下端部を切り放す刃部１３
が設けられている。凹部５の下端部側の壁部５ｂには、
後述する空気吸引手＃′９：、ｌｌに接続される空気吸
引孔１４ａ、 １４ａが開［ｊされている。空気吸引孔
１４ａ、１４ａのキャビティ側の開口部には、第３図に
示すように、焼結金属からなる薄板状の枠工５．１５が
嵌珊され、この栓１５．１５を介し２てキャビティ３内
の空気が吸引される。The -L end of the recess 5 holds the parison 4 cut out from the extruder (Figure
The compressed air supply nozzle 21 is held through the arm end of the holder; Further, a blade portion 13 is provided at the lower end of the recess 5 for cutting off the lower end of the parison 4 supplied from the extruder.
is provided. In the wall portion 5b on the lower end side of the recess 5,
Air suction holes 14a, 14a connected to air suction hands #'9: and 11, which will be described later, are open [j]. As shown in FIG. 3, a thin plate-shaped frame 5.15 made of sintered metal is fitted into the cavity-side opening of the air suction holes 14a, 14a, and the air flows through the plug 15.15. The air inside the cavity 3 is sucked.
空気吸引手段１】は、第４図に示すよう番−゛、真空ポ
ンプ１６と、真空溜用のチャンバー１７と、管１．８ａ
、１８ｂと、バルブ１．９．２１を備λでいる。真空ポ
ンプ１６は管１８ａを介してチャンバー１７に接続され
、チャンバー１７は管１８ｂを介しで連通孔９、】０及
び空気吸引孔１４ ａ 、 １４ ａ ｋ−、、、、、
、接続されている。バルブ１９は管１８ａに設けられ、
バルブ２０は？ １８ｂに役目られている。The air suction means 1 consists of a vacuum pump 16, a vacuum reservoir chamber 17, and a pipe 1.8a as shown in FIG.
, 18b and valves 1.9.21 are provided. The vacuum pump 16 is connected to a chamber 17 via a pipe 18a, and the chamber 17 is connected to the communication hole 9, ]0 and the air suction holes 14a, 14a, k-, , , , through a pipe 18b.
,It is connected. A valve 19 is provided in the pipe 18a,
What about valve 20? It is played by 18b.
真空ポンプ１６とバルブ】）〕、２０は図示Ｉ７ない駆
動装置により駆動される。バルブ１．９．２０は、所定
の長さのパリソン４が金規〕、２の間に供給される前１
．ニー、バルブ１９が開き珪つバルブ２０が閉じるとヒ
もに真空ポンプ］６が作動して、チャンバー】７内を減
圧する。チャンバー１７は真空ポンプ１６の作動に上り
、常圧より３００ｍ、ｍＨｇ低い気圧Ｊ、・なる。The vacuum pump 16 and valves ]) and 20 are driven by a drive device I7 not shown. The valve 1.9.20 is supplied with a parison 4 of a predetermined length between 1 and 2.
．． When the valve 19 opens and the valve 20 closes, the vacuum pump [6] is operated to reduce the pressure inside the chamber [7]. The vacuum pump 16 is activated in the chamber 17, and the pressure becomes J, which is 300 m and mHg lower than normal pressure.
次に、本実施例にかかるブロー成形方法り、ついて説明
する。Next, the blow molding method according to this example will be explained.
第１図は本実施例のブロー成形方法の王程＋ボ（１、た
ものであり、ブロー成形装置の作動開始前の状態て−は
、真空ポンプｊ６は停」］シ、バルブ】９．２０は閉じ
ており、チャンパルエフは常圧状態に保だれζいる。又
、装置作動前はＨ−縮空気供給ノズル２１及び押出機は
停Ｊトシており、金型】、２は待機位置に位置している
。金型１．２は型開きされた状態になっている。ブロー
成形装置の連作ボタン（図示省略）の電源投入により、
押出機ではパリソン４の押し出し温度が１７０度Ｃ・〜
２２０度Ｃになるよう番Ｊ樹脂の加熱が開始され、バル
ブ１９が開き、真空ポンプ１６が駆動されてチャンバー
１７内のＷ力が減少し始める。ごのチャンバー１７の圧
力減少はチャンバー１７内の大気圧が３００ｍｍＨｇ＆
Ｊなるまで続けられ、チャンバー１７内の大気圧が３０
０ｍｍＨｇになったら、バルブ】９が閉じ真空ポンプ１
６の駆動が伜、＋１−され、チャンバ１７内の減圧状態
が保持される。一方、装置の駆動開始ヒ共に、型開き状
態の金型上、２は押出機のパリソン吐出口の両側部に移
動して停止する。FIG. 1 shows a diagram of the blow molding method of this embodiment, and before the blow molding apparatus starts operating, the vacuum pump j6 is stopped.9. 20 is closed, and the champagne is maintained at normal pressure. Also, before the device is activated, the compressed air supply nozzle 21 and the extruder are stopped, and the molds 2 and 2 are in the standby position. The molds 1 and 2 are in an open state.By turning on the continuous operation button (not shown) of the blow molding device,
In the extruder, the extrusion temperature of parison 4 is 170 degrees C.
Heating of No. J resin is started to reach 220 degrees Celsius, the valve 19 is opened, the vacuum pump 16 is driven, and the W force in the chamber 17 begins to decrease. The pressure decrease in the chamber 17 is as follows: the atmospheric pressure inside the chamber 17 is 300 mmHg &
This continues until the atmospheric pressure in the chamber 17 reaches 30
When the temperature reaches 0mmHg, valve] 9 closes and vacuum pump 1
6 is turned up and +1-, and the reduced pressure state in the chamber 17 is maintained. On the other hand, when the drive of the apparatus is started, the molds 2 move to both sides of the parison discharge port of the extruder and stop on the open mold.
押出機からパリソン４が所定の長さ押し出されたら、金
型】、２を規締めし、図示しないカット手段により金型
１．２の」、。部のパリソン４がカット・すれる。After the parison 4 has been extruded to a predetermined length from the extruder, the molds 1.2 and 2 are tightened, and the molds 1.2 and 2 are cut using cutting means (not shown). Parison 4 of the section is cut and worn out.
パリソン４の下部は金型〕、２の型締め（、゛より融着
される。金型１．２にパリソン４が保持されたら、襲締
め状態の金型１．２を押出機側から圧縮空気供給ノズル
２１の下部に移動させτ停止させる。合掌］、２のパリ
ソン４が圧縮空気供給ノズル２１の下部−１位置（７た
ら、１１１：縮空気供給ノズル２１をパリソン４ｏ上部
に挿入する前（例えば、０．１秒前）に、バルブ２０を
開いてキャビティ３内の空気をチャンバ−１７内番Ｊ吸
引する。これによって、キャビサイ３内（７）空気は、
空気吸引孔８．８．１４ａ、］、４ｂの栓１２、］５を
介してチャンバー１７内に溝入され、キャビティ３内は
減圧される。尚、ブローが早いとキャビティ３内に空気
溜りが生じ易く、ブローが運いとパリソン４がキャビテ
ィ形成壁面５ａ側に引−１＋彊ら才１．て変形するので
、キャビティ３が減圧開始されたら、パリソン４（わ１
一部間［コ部にｊ下線空気供給ノズル２１を挿入し５て
パリソン４内に圧縮空気を供給する。このどきのブロー
−条件として圧縮空気の温度は常温ヒし、圧縮空気の圧
力は６、ＯＫｇｆ／ｃｒ＋ｆ以上とする。圧縮空気供給
ノズル２１によってパリソン４内に圧縮空気を供給しく
いるどきにも、バルブ２０を開いてキャビティ３内の減
圧を継続し７、パリソン４とキャビティ形成壁面５ａと
の間の空気を砂川する。、＝れによって、キャビティ３
内のパリソン４がキャビティ形成壁面５ａに密着して成
形品が成形される。キャビティ形成壁面５ａの中心線平
均粗さは０°２５１１１１］以ドに設定ＺｋれＣいるの
て一１成形品の外表面は非常に平滑な面となり、光沢度
が高いものとなる。成形品がキャビティ３内に形成され
たｒ）、圧縮空気供給ノズル２１からの圧縮空気供給を
停止する２−共に、バルブ２０を閉じＣ４−ヤビアイ３
の空気吸引を停止（５、ｙに、合羽１゜２を閉じた状態
で成形品を冷却（７つつ待機（ｆｆ置に移動さ１＋る。The lower part of the parison 4 is fused by the mold] and the mold clamping (,) of 2. Once the parison 4 is held in the mold 1.2, the mold 1.2 in the clamped state is compressed from the extruder side. Move the air supply nozzle 21 to the lower part of the air supply nozzle 21 and stop τ. When the parison 4 of 2 is at the lower part of the compressed air supply nozzle 21 - 1 position (7, 111: Before inserting the compressed air supply nozzle 21 into the upper part of the parison 4o) (for example, 0.1 seconds before), open the valve 20 and suck the air inside the cavity 3 into the chamber 17. As a result, the air inside the cavity 3 (7) is
The air is grooved into the chamber 17 through the plugs 12, ]5 of the air suction holes 8.8.14a, ], 4b, and the pressure inside the cavity 3 is reduced. It should be noted that if the blowing is done too quickly, air pockets will easily form inside the cavity 3, and if the blowing is done too quickly, the parison 4 will be pulled toward the cavity forming wall surface 5a. Therefore, when cavity 3 starts depressurizing, parison 4 (wa 1
The compressed air is supplied into the parison 4 by inserting the air supply nozzle 21 into the part [J underlined]. The current blowing conditions are that the temperature of the compressed air is room temperature and the pressure of the compressed air is 6,000 kgf/cr+f or more. When compressed air is supplied into the parison 4 by the compressed air supply nozzle 21, the valve 20 is opened to continue reducing the pressure in the cavity 3 7, and the air between the parison 4 and the cavity forming wall 5a is drained. . ,=by cavity 3
A molded product is formed with the inner parison 4 in close contact with the cavity forming wall surface 5a. The center line average roughness of the cavity forming wall surface 5a is set to 0°251111] or less, and the outer surface of the molded product becomes a very smooth surface and has a high degree of gloss. When the molded product is formed in the cavity 3 r), stop the compressed air supply from the compressed air supply nozzle 21 2 - At the same time, close the valve 20 C4 - Yaviai 3
Stop the air suction (5, y, cool the molded product with the cover 1°2 closed (7) and wait (move to ff position and move to 1+).
待機位置に金５１．２が移動したら金型上、２を停止さ
せると共に一１金型１．２を謀開きしＣ成形品を図示し
ない収納装置に涌下させる。これにより、成形品の外表
面の中心線平均粗さは０．０９μｍ以トとなり、子の外
表面の６０度鏡面反射による光沢度は９０％以上とな−
）だ。When the metal 51.2 moves to the standby position, the mold 2 is stopped, the mold 11 is opened wide, and the C molded product is lowered into a storage device (not shown). As a result, the center line average roughness of the outer surface of the molded product is 0.09 μm or less, and the gloss level of the outer surface of the child due to 60 degree specular reflection is 90% or more.
)is.
成形品を収納装置に落１・、′５せたら、次の成形品の
成形のために、バルブ２０を閉じバルブ１９を開いて真
空ポンプ１６を駆動し１、チャンバー１フ内を再度滅１
（−する。After dropping the molded product into the storage device, close the valve 20 and open the valve 19 to drive the vacuum pump 16 and evacuate the inside of the chamber 1 again for molding the next molded product.
(- to do.
尚、本実施例にかがるブロー成形方法の実験例１では、
パリソンは２層タイプのものを用い、内層に高密度ポリ
エチレン（ＨＤＰＥ、 例えば三井石油化学株式会社
製のハイデックス６２００Ｂ）を用い、外層には線状低
密度ポリエチレン（Ｌ−ＤＰＥ、 例えば三井石油化
学株式会社製のウルトゼックス３５２ＤＬ）を用いた。In addition, in Experimental Example 1 of the blow molding method according to this example,
The parison is of a two-layer type, with the inner layer made of high-density polyethylene (HDPE, e.g., Hidex 6200B manufactured by Mitsui Petrochemical Co., Ltd.), and the outer layer made of linear low-density polyethylene (L-DPE, e.g., made by Mitsui Petrochemical Co., Ltd.). Urtozex 352DL) manufactured by Co., Ltd. was used.
又、会規の材質はアルミニウムとし、キャビティ形成壁
面１ａの中心線平均粗さは０．２μｍに設定し、連通孔
９、】０及び空気吸引孔１４ａ、１４ａには直径ｉｏａ
ｍの焼結金属からなる栓１２．１５を（れぞれ嵌合［１
，た、！！に、パリソン４の押し出し温度は１．７０度
Ｃに設定し、チャンバー１７の圧力を７００＋ａｍ１１
ｇとし、ブロー成形の圧縮空気の圧力を８． ＯＫｇｆ
／ｃｎ（とした。In addition, the material of the regulation is aluminum, the center line average roughness of the cavity forming wall surface 1a is set to 0.2 μm, and the communicating holes 9, ]0 and air suction holes 14a, 14a have a diameter of ioa.
m plugs 12 and 15 made of sintered metal (fitting [1
,Ta,! ! The extrusion temperature of parison 4 was set to 1.70 degrees C, and the pressure of chamber 17 was set to 700 + am11.
g, and the pressure of compressed air for blow molding is 8. OKgf
/cn()
以上の条件でブローＳ形を行なうと、成形品の外表面の
中心線平均粗さは０．０７μｍとなり、その外表面の６
０度鏡面反射は９０．５％となった。When S-shaped blowing is performed under the above conditions, the center line average roughness of the outer surface of the molded product is 0.07 μm, and the outer surface of
The 0 degree specular reflection was 90.5%.
この結果に較べて、パリソンの材質Ｌ１ 金型の材質
と、パリソンの押し出し温度及び圧縮空気の圧力節を上
記実験例１に同じく設定し、連通孔９゜１０、空気吸引
孔１４ａ、］、４ａを大艷に開放して翼空吸弓を行なわ
乙゛い比較のための実験を行なった結果、成形品の中心
線平均粗さは０．０８μｍとなり、その外表面の光沢度
は６０度鏡面反射の場合９０％となったが、成形品の外
表面に空気溜り跡が不規則に存在した。Compared to this result, the parison material L1, the mold material, the extrusion temperature of the parison, and the compressed air pressure node were set the same as in Experimental Example 1 above, and the communication hole was 9°10, the air suction hole 14a, ], 4a. As a result of conducting an experiment for comparison by opening the molded product to a large ship and performing a wing air suction bow, the center line average roughness of the molded product was 0.08 μm, and the gloss of the outer surface was 60 degrees mirror surface. In the case of reflection, it was 90%, but air pocket marks were irregularly present on the outer surface of the molded product.
同様に、樹脂の利賀、樹脂の押し出し温度、圧縮空気の
ブロー圧力も実験例１に同じと１７、金型のキャビティ
形成壁面の中心線平均粗さを２．３１１ｍとして真空吸
引を行なわずブロー成形を荀なうた、成形品の外表面の
中心線平均粗さは１．ＯＩＬｍ＆なり、その外表面の６
０度鏡面反射にＪ、る光沢度は３９．６％さなった。Similarly, the resin Toga, resin extrusion temperature, and compressed air blowing pressure were the same as in Experimental Example 1, and the center line average roughness of the mold cavity forming wall was 2.311 m, and blow molding was performed without vacuum suction. The center line average roughness of the outer surface of the molded product is 1. OILm & becomes its outer surface 6
The gloss level was 39.6% lower than that of 0 degree specular reflection.
この実験結果からも明らかなようＵ、本実施例にかかる
ブロー成形方法によれば、ブロー成形によって成形品を
成形する場合であっても、成形品の外表面の中心線平均
粗さ（ＪＩＳ Ｂ ０６０１−１９８２）を０．０９μ
ｍ以下に設定でき、成形品外表面の６０度鏡面反射の光
沢度を９０％以上にすることが出来る。As is clear from this experimental result, according to the blow molding method of this example, even when molded products are formed by blow molding, the center line average roughness (JIS B 0601-1982) to 0.09μ
m or less, and the glossiness of the 60 degree specular reflection on the outer surface of the molded product can be set to 90% or more.
（発明の効果）
本発明にかかるブロー成形方法は以上説明したように桝
成したので、ブロー成形によって成形される成形品の外
表面の表面粗さを非常に平滑なものとするこヒが出来、
成形品の外表面の光沢度を従来よりも１しく向上させる
ことが出来るという優れた効果を奏する。(Effects of the Invention) Since the blow molding method according to the present invention has been established as described above, the surface roughness of the outer surface of the molded product formed by blow molding can be made extremely smooth.
This has an excellent effect in that the glossiness of the outer surface of the molded product can be improved by 1 degree compared to the conventional method.
第１図は、本実施例のブロー成形］−程の説明図、第２
図は、本発明の実施例にかかるブロー成形方法に用いる
金型の概略斜視図
第３図は、本実施例のブロー成形金型を型締め１〜た時
の説明図、
第４図は、第１図のブロー成形金型に接続される空気吸
引手段の説明図、
第５図−・・第７図は真空吸引上程な示“す説明図であ
る。
５ａ・・・凹部の壁面（キャビティ形成歌面）６１．７
・・・吸引用凹部
６ａ、７ａ・・・湾
８・・空気吸引孔
１０・連理孔
１］・・空気吸引手段
１２・・栓
１．２・・・金型（ブロー成形金型）
１ａ・・パーティング面
３・・キャビティ
４・・・パリソン
５・・・凹部
第
２
図
１（注１−１）
第
第
図
図Figure 1 is an explanatory diagram of blow molding of this example,
FIG. 3 is a schematic perspective view of a mold used in the blow molding method according to the embodiment of the present invention. FIG. FIG. 1 is an explanatory diagram of the air suction means connected to the blow molding mold, and FIGS. 5 to 7 are explanatory diagrams showing the vacuum suction process. Formation song surface) 61.7
Suction recesses 6a, 7a Bay 8 Air suction hole 10/Connection hole 1] Air suction means 12 Plug 1.2 Mold (blow mold) 1a・Parting surface 3...Cavity 4...Parison 5...Concave part 2 Figure 1 (Note 1-1) Figure 1
Claims (1)
ティが形成される金型のキャビティ形成壁面の中心線平
均粗さを０．２５μｍ以下に設定し、前記金型を型締め
するときに前記キャビティにブロー成形用のパリソンを
位置させた後、少なくともこのパリソンに圧縮空気を充
填する以前に、このパリソンの外部にある前記キャビテ
ィ内の空気を吸引しつつ、前記圧縮空気を前記パリソン
に充填して成形品を形成することを特徴とするブロー成
形方法。(1) The center line average roughness of the cavity forming wall surface of the mold in which a cavity as a molded product forming space is formed when the mold is clamped is set to 0.25 μm or less, and when the mold is clamped, the After positioning a parison for blow molding in a cavity, at least before filling this parison with compressed air, the parison is filled with the compressed air while sucking air inside the cavity outside the parison. A blow molding method characterized by forming a molded product by
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2074228A JPH03272826A (en) | 1990-03-22 | 1990-03-22 | Blow molding process |
| US07/672,669 US5217729A (en) | 1990-03-22 | 1991-03-21 | Mold for plastic bottles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2074228A JPH03272826A (en) | 1990-03-22 | 1990-03-22 | Blow molding process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03272826A true JPH03272826A (en) | 1991-12-04 |
Family
ID=13541109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2074228A Pending JPH03272826A (en) | 1990-03-22 | 1990-03-22 | Blow molding process |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03272826A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5838126A (en) * | 1981-08-31 | 1983-03-05 | Showa Denko Kk | Extruded hollow molding of polyolefin and molding method thereof |
| JPH01125214A (en) * | 1987-08-04 | 1989-05-17 | Idemitsu Petrochem Co Ltd | Method and apparatus for thermoforming thermoplastic resin sheet |
-
1990
- 1990-03-22 JP JP2074228A patent/JPH03272826A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5838126A (en) * | 1981-08-31 | 1983-03-05 | Showa Denko Kk | Extruded hollow molding of polyolefin and molding method thereof |
| JPH01125214A (en) * | 1987-08-04 | 1989-05-17 | Idemitsu Petrochem Co Ltd | Method and apparatus for thermoforming thermoplastic resin sheet |
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