JP3358230B2 - Blow molding equipment - Google Patents
Blow molding equipmentInfo
- Publication number
- JP3358230B2 JP3358230B2 JP07586893A JP7586893A JP3358230B2 JP 3358230 B2 JP3358230 B2 JP 3358230B2 JP 07586893 A JP07586893 A JP 07586893A JP 7586893 A JP7586893 A JP 7586893A JP 3358230 B2 JP3358230 B2 JP 3358230B2
- Authority
- JP
- Japan
- Prior art keywords
- elastic sheet
- parison
- blow molding
- mold
- gas
- 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 - Fee Related
Links
- 238000000071 blow moulding Methods 0.000 title claims description 19
- 239000000463 material Substances 0.000 claims description 5
- 238000007664 blowing Methods 0.000 description 5
- 229920002379 silicone rubber Polymers 0.000 description 3
- 239000004945 silicone rubber Substances 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 206010042674 Swelling Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
- B29C49/0411—Means for defining the wall or layer thickness
- B29C49/04114—Means for defining the wall or layer thickness for keeping constant thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/007—Using fluid under pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は樹脂成形品のブロー成形
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow molding apparatus for a resin molded product.
【０００２】[0002]
【従来の技術】本出願人は、先に特願平４−１２８００
９号において、弾性シートを張設した分割型を用いて、
樹脂成形品をブロー成形することにより、成形品の肉厚
を均一化するブロー成形方法を提案した。すなわち、パ
リソンは膨満初期に金型に接触したところは伸張しにく
いので厚肉になろうとするが、金型とパリソンとの間に
弾性シートを介在させてブロー成形することにより、弾
性シートが均一に伸張しようとするので、成形品の肉厚
の均一化が促進される。2. Description of the Related Art The present applicant has previously filed Japanese Patent Application No. Hei.
In No. 9, using a split type with an elastic sheet stretched,
A blow molding method for making the thickness of a molded product uniform by blow molding the resin molded product was proposed. In other words, the parison is difficult to stretch when it comes into contact with the mold in the initial stage of swelling, so it tends to be thick.However, the elastic sheet is made uniform by blowing the elastic sheet between the mold and the parison. Therefore, the uniform thickness of the molded article is promoted.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記弾性シー
トを利用した均一肉厚ブロー成形において、種々のテス
トを行ったところ、弾性シートのくり返し使用のため、
伸張率がある一定値を越えると、弾性シートが破断し、
耐久性が著しく低下することが判明した。However, various tests were conducted on the uniform thickness blow molding using the above elastic sheet.
When the elongation exceeds a certain value, the elastic sheet breaks,
It was found that the durability was significantly reduced.
【０００４】本発明の目的は、弾性シートを型にとりつ
けたブロー成形装置であって、弾性シートの破断を防止
し、装置の耐久性を向上させたブロー成形装置を提供す
ることにある。An object of the present invention is to provide a blow molding apparatus in which an elastic sheet is attached to a mold, which prevents breakage of the elastic sheet and improves the durability of the apparatus.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
の本発明に係るブロー成形装置は、次の装置から成る。
すなわち、内側にキャビティを形成する分割型と、前記
キャビティを覆うように前記分割型にとりつけられた弾
性シートと、を備えたブロー成形装置において、前記弾
性シートの自由伸張部の初期寸法を、前記弾性シートが
膨満伸張してキャビティ面長となったときの前記弾性シ
ートの伸張率が、前記弾性シートがパリソンに接触した
ときに受ける温度における前記弾性シートの材料の破断
伸張率未満となるように設定したブロー成形装置。The blow molding apparatus according to the present invention for achieving the above object comprises the following apparatus.
That is, in a blow molding apparatus including a split mold that forms a cavity inside, and an elastic sheet attached to the split mold so as to cover the cavity, the initial dimension of the free extension portion of the elastic sheet is The stretch rate of the elastic sheet when the elastic sheet expands and becomes the cavity surface length is less than the breaking extension rate of the material of the elastic sheet at the temperature received when the elastic sheet comes into contact with the parison. Set blow molding equipment.
【０００６】[0006]
【作用】上記本発明のブロー成形装置では、弾性シート
の最終伸張率がブロー成形時の弾性シート温度における
弾性シート材の破断伸張率未満となるように、弾性シー
トの自由伸張部の初期寸法が設定されているので、弾性
シートが高温状態下でくりかえし伸張されても破断に至
らず、装置の耐久性が向上する。According to the blow molding apparatus of the present invention, the initial dimension of the free stretch portion of the elastic sheet is adjusted so that the final stretch rate of the elastic sheet is less than the breaking extension rate of the elastic sheet material at the temperature of the elastic sheet during blow molding. Since it is set, even if the elastic sheet is repeatedly stretched under a high temperature state, it does not break, and the durability of the device is improved.
【０００７】[0007]
【実施例】以下に、本発明に係るブロー成形装置の望ま
しい実施例を図面を参照して説明する。図１に示すよう
に、本発明実施例のブロー成形装置は、パリソン押し出
し機１と、内側にキャビティ２′、３′を郭定する分割
型２、３（金型）と、分割型２、３にとりつけられた弾
性シート５と、パリソン６内にガスを吹き込むガス吹き
込みノズル４と、ピンチ板７を有する。分割型２、３に
は、キャビティ２′、３′に開口するガス孔８が設けら
れている。分割型２、３は互いに進退可能である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a blow molding apparatus according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, a blow molding apparatus according to an embodiment of the present invention includes a parison extruder 1, split dies 2, 3 (molds) for defining cavities 2 ', 3' inside, split dies 2, 3, a gas blow nozzle 4 for blowing gas into the parison 6, and a pinch plate 7. The split molds 2 and 3 are provided with gas holes 8 opening to the cavities 2 'and 3'. The split molds 2 and 3 can move forward and backward with each other.
【０００８】弾性シート５は分割型２、３のキャビティ
開口端部に、キャビティ２′、３′を覆うようにとりつ
けられている。弾性シート５はその中央部がパリソン６
側に突出した凸状面に予じめ形成されている。また、金
型２、３にとりつけた時は、弾性シートはその中央部が
下方に垂れ下って図１のような形状になる。An elastic sheet 5 is attached to the cavity opening ends of the split dies 2 and 3 so as to cover the cavities 2 'and 3'. The elastic sheet 5 has a parison 6 at its center.
It is formed in advance on a convex surface protruding to the side. When the elastic sheet is attached to the dies 2 and 3, the central portion of the elastic sheet hangs downward and has a shape as shown in FIG.
【０００９】上記装置を用いて、次のようにブロー成形
が実施される。まず、図１に示すように、分割型２、３
を開いておく。弾性シート５は金型の取付けられる周辺
部を除いた自由伸張部が、パリソン側に突出して丘陵状
に成形されている。この弾性シートの成形には、丘陵形
状を有する金型を用いた通常のプレス法による加硫成形
法を用いる。また、金型２、３にとりつけた時は丘陵部
は自重により下方に垂れ下っている。Using the above-described apparatus, blow molding is performed as follows. First, as shown in FIG.
Open. The elastic sheet 5 is formed in a hill shape with a free extension portion excluding a peripheral portion to which a mold is attached, protruding toward the parison side. For the formation of the elastic sheet, a vulcanization molding method by a normal pressing method using a mold having a hill shape is used. When the hills are attached to the dies 2 and 3, the hills hang down due to their own weight.
【００１０】つきに、図２に示すように、ガス孔８から
キャビティ２′、３′に向けてガス供給装置（図示せ
ず）よりガス（通常はエア）が供給される。これによ
り、弾性シート５は初期の丘陵状形状となる。このとき
供給されるガス圧は、弾性シート５が伸張しない程度
に、適宜設定する。一方、パリソン６がパリソン押し出
し機１から円筒状に押し出される。In addition, as shown in FIG. 2, a gas (usually air) is supplied from a gas supply device (not shown) from the gas holes 8 to the cavities 2 ', 3'. As a result, the elastic sheet 5 has an initial hill-like shape. The gas pressure supplied at this time is appropriately set so that the elastic sheet 5 does not expand. On the other hand, the parison 6 is extruded from the parison extruder 1 into a cylindrical shape.
【００１１】所定の長さのパリソン６を押し出した後、
図３に示すように、パリソン６の先端部をピンチ板７で
閉塞し、ガス吹き込みノズル４より、パリソン６内部に
ガス（通常はエア）を吹き込む。このときのガス圧は２
ｋｇｆ／ｃｍ2 （１９６ＫＰａ）程度である。同時に金
型２、３が閉じられていく。このとき、弾性シート５
は、その丘陵状の頂部より順次外周部に向ってパリソン
６と接触していくため、弾性シート５とパリソン６との
間にエアの閉じ込みが生じず、弾性シート５とパリソン
６は全面で良好に一体化していく。After extruding a parison 6 of a predetermined length,
As shown in FIG. 3, the tip of the parison 6 is closed with a pinch plate 7, and gas (usually air) is blown into the parison 6 from the gas blowing nozzle 4. The gas pressure at this time is 2
It is about kgf / cm 2 (196 KPa). At the same time, the molds 2 and 3 are closed. At this time, the elastic sheet 5
Is in contact with the parison 6 sequentially from its hill-shaped top toward the outer periphery, so that no air is trapped between the elastic sheet 5 and the parison 6, and the elastic sheet 5 and the parison 6 Good integration.
【００１２】金型２、３が閉じられた後、図４に示すよ
うに、ガス吹き込みノズル４からのガス圧を上げ、本成
形を行う。ガス圧は、たとえば３〜２０ｋｇｆ／ｃｍ2
（２９４〜１９６０ＫＰａ）に上げられる。ガス圧の上
昇により、弾性シート５と一体化したパリソン６は、キ
ャビティ２′、３′内に急速に膨満する。このとき、金
型２、３に設置されたガス孔８を、適宜のタイミングで
大気開放とすることにより、金型２、３と弾性シート５
間のガスを排気する。また、弾性シート５はその弾性特
性により、張力が全域に均一に伝わり、キャビティ
２′、３′のどの部分においても、均一な膨張率で伸
張、膨満する。After the molds 2 and 3 are closed, as shown in FIG. 4, the gas pressure from the gas blowing nozzle 4 is increased to perform the main molding. The gas pressure is, for example, 3 to 20 kgf / cm 2
(294 to 1960 KPa). Due to the increase in gas pressure, the parison 6 integrated with the elastic sheet 5 rapidly expands into the cavities 2 ', 3'. At this time, the gas holes 8 provided in the dies 2 and 3 are opened to the atmosphere at an appropriate timing, so that the dies 2 and 3 and the elastic sheet 5 are opened.
Exhaust gas in between. Further, the elastic sheet 5 has its elastic properties to transmit the tension uniformly throughout the entire area, and expands and swells at a uniform expansion rate in any part of the cavities 2 'and 3'.
【００１３】上記において、弾性シート５をパリソン６
側に凸に形成した作用効果は次の通りである。ただし、
説明を平易にするため、型形状を、図５に示すように、
２次元の形状として説明する。キャビティ２′あるいは
３′の面長Ｌ、すなわち弾性シート５の最終伸張寸法
が、該弾性シート５の所定温度（弾性シート５がパリソ
ン６に接触したときに受ける温度）における弾性シート
材料の破断伸張率（シリコーンゴムの場合は約２３０
％）を越える場合、破断を生じることになる。したがっ
て、弾性シート５の自由伸張部の初期寸法ｌを、最終伸
張寸法Ｌがｌの２３０％を越えないように設定すれば、
破断は生じないかまたは生じにくくなる。In the above, the elastic sheet 5 is formed by the parison 6
The functions and effects formed convexly on the side are as follows. However,
For simplicity of description, the shape of the mold was changed as shown in FIG.
The description will be made as a two-dimensional shape. When the surface length L of the cavity 2 ′ or 3 ′, that is, the final extension size of the elastic sheet 5, is set at a predetermined temperature of the elastic sheet 5 (the temperature at which the elastic sheet 5 comes into contact with the parison 6), the breaking extension of the elastic sheet material is performed. Rate (about 230 for silicone rubber)
%), Breakage will occur. Therefore, if the initial dimension l of the free extension portion of the elastic sheet 5 is set so that the final extension dimension L does not exceed 230% of l,
Breakage does not occur or hardly occurs.
【００１４】図７に示すように、用いたシリコーンゴム
の破断時伸張率は温度の上昇により低下することが知ら
れている。一方、高分子ポリエチレンのパリソンのブロ
ー成形時の温度は２００〜２３０℃であり、これと一体
化して伸張するシリコーンゴムの弾性シート５の２３０
℃における破断時伸張率は２７０〜２３０％と推定され
る。したがって、従来技術において、弾性シートを平板
状に金型へとりつけたときのようにシリコーンゴム弾性
シートを伸張率２３０％以上で使用すると、１回ないし
は数回使用しているうちに破断に至るが、本発明のよう
に、弾性シートの自由伸張部を予め丘陵状に成形して弾
性シート５を破断伸張率２３０％未満で使用した場合に
は、耐久性が著しく向上する。As shown in FIG. 7, it is known that the elongation at break of the silicone rubber used decreases as the temperature rises. On the other hand, the temperature at the time of blow molding of the high-molecular polyethylene parison is 200 to 230 ° C.
The elongation at break in ° C. is estimated to be 270-230%. Therefore, in the prior art, when the silicone rubber elastic sheet is used at an elongation rate of 230% or more, such as when the elastic sheet is attached to a mold in a flat shape, breakage may occur during one or several uses. As in the present invention, when the free stretch portion of the elastic sheet is preliminarily formed into a hill and the elastic sheet 5 is used with a breaking extension rate of less than 230%, the durability is remarkably improved.
【００１５】キャビティ形状に膨満伸張したパリソン６
は、図６に示すように、内部吹込みガスおよび弾性シー
ト５を介して金型２、３により冷却、固化された後、金
型２、３を開き、成形品９を離型し型からとり出す。こ
のとき、金型２、３開き開始と同時に、金型２、３のガ
ス孔８からエアをキャビティへ吹込むことにより、弾性
シート５の復元力とあいまって、成形品９を型から容易
にとり出すことができ、また弾性シート５から容易に剥
離できる。Parison 6 expanded and expanded into a cavity shape
After being cooled and solidified by the molds 2 and 3 via the internal blowing gas and the elastic sheet 5 as shown in FIG. 6, the molds 2 and 3 are opened, and the molded article 9 is released from the mold. Take out. At this time, air is blown into the cavity from the gas holes 8 of the molds 2 and 3 at the same time as the molds 2 and 3 are opened, so that the molded article 9 can be easily removed from the mold in combination with the restoring force of the elastic sheet 5. And can be easily peeled off from the elastic sheet 5.
【００１６】なお、本発明における、予め成形される弾
性シート５の形状は、種々の検討の結果、弾性シート５
とパリソン６の良好な一体化、膨満時の均一伸長性か
ら、実施例に示すような円弧をなす丘陵状形状が最適で
あるが、その他に、略錘状、台形状も比較的良好な結果
が得られた。According to the present invention, the shape of the preformed elastic sheet 5 is determined by various studies.
From the viewpoint of good integration of the and the parison 6 and uniform extensibility when inflated, the hill-like shape forming an arc as shown in the embodiment is optimal, but in addition, the approximate weight and trapezoidal shape are also relatively good. was gotten.
【００１７】[0017]
【発明の効果】本発明によれば、弾性シートの自由伸張
部の初期寸法を、最終膨満伸張時の伸張率が、パリソン
と接触して所定温度になったときの破断伸張率未満とな
るように設定したので、弾性シートの耐久性を向上でき
る。According to the present invention, the initial size of the free extension portion of the elastic sheet is set so that the extension ratio at the time of final full extension is less than the breaking extension ratio at the time of contact with the parison and at a predetermined temperature. , The durability of the elastic sheet can be improved.
【図１】本発明の一実施例に係るブロー成形装置のブロ
ー成形開始前の断面図である。FIG. 1 is a sectional view of a blow molding apparatus according to an embodiment of the present invention before blow molding is started.
【図２】図１の装置でパリソンを分割型間に押し出した
状態の断面図である。FIG. 2 is a cross-sectional view showing a state in which a parison is extruded between split molds in the apparatus of FIG.
【図３】図１の装置で型閉じ途中の状態の断面図であ
る。FIG. 3 is a cross-sectional view of the apparatus of FIG. 1 in a state in which the mold is being closed.
【図４】図１の装置で本成形途中の状態の断面図であ
る。FIG. 4 is a cross-sectional view of the apparatus of FIG.
【図５】図１の装置で、弾性シートの初期長さｌと型面
の長さＬとを示す断面図である。FIG. 5 is a cross-sectional view showing an initial length 1 of an elastic sheet and a length L of a mold surface in the apparatus of FIG.
【図６】図１の装置で型開きしている状態の断面図であ
る。FIG. 6 is a sectional view showing a state where the mold is opened in the apparatus of FIG. 1;
【図７】種々の弾性シート材の破断伸び対温度特性図で
ある。FIG. 7 is a graph showing elongation at break versus temperature of various elastic sheet materials.
１ パリソン押し出し機 ２ 分割型 ３ 分割型 ２′ キャビティ ３′ キャビティ ４ ガス吹き込みノズル ５ 弾性シート ６ パリソン ７ ピンチ板 ８ ガス孔 ９ 成形品 Reference Signs List 1 parison extruder 2 split mold 3 split mold 2 'cavity 3' cavity 4 gas injection nozzle 5 elastic sheet 6 parison 7 pinch plate 8 gas hole 9 molded product
Claims (1)
前記キャビティを覆うように前記分割型にとりつけられ
た弾性シートと、を備えたブロー成形装置において、前
記弾性シートの自由伸張部の初期寸法を、前記弾性シー
トが膨満伸張してキャビティ面長となったときの前記弾
性シートの伸張率が、前記弾性シートがパリソンに接触
したときに受ける温度における前記弾性シートの材料の
破断伸張率未満となるように設定したことを特徴とする
ブロー成形装置。1. A split mold for forming a cavity inside,
An elastic sheet attached to the split mold so as to cover the cavity, in the blow molding apparatus, the initial dimension of the free extension of the elastic sheet, the elastic sheet is expanded and expanded to the cavity surface length. The blow molding apparatus is characterized in that the elongation rate of the elastic sheet is set to be less than the breaking elongation rate of the material of the elastic sheet at the temperature received when the elastic sheet comes into contact with the parison.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07586893A JP3358230B2 (en) | 1993-04-01 | 1993-04-01 | Blow molding equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07586893A JP3358230B2 (en) | 1993-04-01 | 1993-04-01 | Blow molding equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06285957A JPH06285957A (en) | 1994-10-11 |
| JP3358230B2 true JP3358230B2 (en) | 2002-12-16 |
Family
ID=13588671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07586893A Expired - Fee Related JP3358230B2 (en) | 1993-04-01 | 1993-04-01 | Blow molding equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3358230B2 (en) |
-
1993
- 1993-04-01 JP JP07586893A patent/JP3358230B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06285957A (en) | 1994-10-11 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |