JPH0476764B2 - - Google Patents
Info
- Publication number
- JPH0476764B2 JPH0476764B2 JP31385587A JP31385587A JPH0476764B2 JP H0476764 B2 JPH0476764 B2 JP H0476764B2 JP 31385587 A JP31385587 A JP 31385587A JP 31385587 A JP31385587 A JP 31385587A JP H0476764 B2 JPH0476764 B2 JP H0476764B2
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- thin film
- molding
- molded
- burrs
- 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
- 229920003002 synthetic resin Polymers 0.000 claims description 29
- 239000000057 synthetic resin Substances 0.000 claims description 29
- 239000010409 thin film Substances 0.000 claims description 21
- 238000000071 blow moulding Methods 0.000 claims description 12
- 239000002904 solvent Substances 0.000 claims description 12
- 238000001746 injection moulding Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 description 10
- 238000000465 moulding Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (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〕
本発明は合成樹脂の成形技術に係り、割型の構
造に起因するパーテイングライン部のバリのない
成形体を構成することができる樹脂成形体の製造
方法に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a synthetic resin molding technology, and relates to a resin molding method that can form a molded product without burrs at the parting line caused by the structure of the split mold. This relates to a method of manufacturing a body.
合成樹脂の成形方法としては一般に射出成形が
行なわれているが、この種の単なる射出成形では
割型の接合部の構造によつて成形面に発生するパ
ーテイングラインが成形品のバリとなつて生じ、
最小でも数十μｍ程度のバリが残存するため、こ
のバリが製品としての価値を引き下げる重大な問
題を有していた。
Injection molding is generally used as a method for molding synthetic resins, but in this type of simple injection molding, parting lines that occur on the molding surface due to the joint structure of the split molds can become burrs on the molded product. arise,
Since burrs of at least several tens of micrometers remain, this burr has had a serious problem of lowering the value of the product.
本発明は上記問題に鑑みてなされたもので、パ
ーテイングライン部のバリを有しない高精度の合
成樹脂成形体を得る方法を提唱することを目的と
するものである。
The present invention has been made in view of the above problems, and it is an object of the present invention to propose a method for obtaining a highly accurate synthetic resin molded product that does not have burrs at the parting line portion.
本発明に係る樹脂成形体の製造方法は、ブロー
成形と射出成形を組み合わせて外周に薄膜フイル
ムを被覆した成形品を成形した後、薄膜フイルム
を除去することによつて目的の成形体を得るもの
であり、ブロー成形によつて割型の内面に合成樹
脂薄膜を張設した後、該合成樹脂薄膜内の中空部
に溶剤を異にする合成樹脂を射出成形により充填
するとともに、該成形体の表面に被着した合成樹
脂薄膜を適当な溶剤によつて溶解除去することに
より前記割型の構造に起因するパーテイングライ
ン部のバリのない成形体を得ることを要旨とする
ものである。
The method for producing a resin molded article according to the present invention combines blow molding and injection molding to form a molded article whose outer periphery is covered with a thin film, and then removes the thin film to obtain the desired molded article. After a synthetic resin thin film is stretched on the inner surface of the split mold by blow molding, a synthetic resin containing a different solvent is filled into the hollow part of the synthetic resin thin film by injection molding, and the molded body is The gist of this method is to obtain a molded product free of burrs at the parting line caused by the structure of the split mold by dissolving and removing the synthetic resin thin film adhered to the surface using a suitable solvent.
上記割型によつてブロー成形を行なつた段階で
は、薄膜フイルムの外側表面にはパーテイングラ
イン部のバリが成形されている。しかし、この薄
膜フイルムによつて「継目」のない射出成形の内
腔部が形成されているため、該内腔部に射出成形
された成形体の表面にはバリが生ずることがな
い。しかも成形体の表面を被覆している薄膜フイ
ルムが成形体の合成樹脂と溶剤を異にするもので
あるため、成形体を溶解しない適当な溶剤によつ
て薄膜フイルムのみを溶解除去することによつて
バリのない成形体を得ることができる。
At the stage where blow molding is performed using the split mold, burrs at the parting line portion are formed on the outer surface of the thin film. However, since the thin film forms a seamless inner cavity for injection molding, no burrs will form on the surface of the molded article injection molded into the inner cavity. Moreover, since the thin film covering the surface of the molded object uses a different solvent from the synthetic resin of the molded object, it is possible to dissolve and remove only the thin film using an appropriate solvent that does not dissolve the molded object. A molded article without burrs can be obtained.
以下、本発明に係る樹脂成形体の製造方法の一
実施例を図面にしたがつて説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for manufacturing a resin molded body according to the present invention will be described below with reference to the drawings.
第１図は同一架台１上においてブロー成形と射
出成形を行なうようにした本発明を実施するため
の成形装置の略図を示すものであり、該架台１は
固定板２に対して適宜旋回駆動機構（図示せず）
により可動板３を矢印Ａ方向に90度旋回変位する
とともに、シリンダ等の適宜平行移動機構（図示
せず）を介して矢印Ｂ方向に平行移動する構成に
したもので、該可動板３に対して割型４，４を所
定位置で当接するように、それぞれ矢印Ｃ方向に
拡開および閉止自在に枢設してなる。また符号５
はブロー成形用押出機ノズルであり、二点鎖線位
置の割型４，４に対してノズル端を嵌合するよう
になる。符号６は射出成形ノズルであり、実線位
置の割型４，４に対してノズル端を嵌合するよう
になる。 FIG. 1 shows a schematic diagram of a molding apparatus for carrying out the present invention, in which blow molding and injection molding are carried out on the same pedestal 1. (not shown)
The movable plate 3 is rotated by 90 degrees in the direction of arrow A, and is also translated in the direction of arrow B via an appropriate parallel movement mechanism (not shown) such as a cylinder. The split molds 4, 4 are pivoted so as to be able to open and close in the direction of arrow C so as to abut each other at a predetermined position. Also code 5
is an extruder nozzle for blow molding, and the nozzle end is fitted into the split molds 4, 4 located at the two-dot chain line position. Reference numeral 6 designates an injection molding nozzle, and the nozzle end is fitted into the split molds 4, 4 at the solid line position.
本発明の樹脂成形体の製造方法は、つぎの工程
によつて所望の中子などの成形体１０を成形する
ものである。 The method for manufacturing a resin molded body of the present invention involves molding a desired molded body 10 such as a core through the following steps.
(1) まず第１図の二点鎖線の成形位置において、
第２図に示すように、両割型４，４を開いた状
態でブロー成形用押出機ノズル５から溶剤によ
つて溶解した合成樹脂膜を円筒状に押し出し、
ブロー成形用パリソン１１を成形する。(1) First, at the molding position indicated by the chain double-dashed line in Figure 1,
As shown in FIG. 2, with both split molds 4, 4 open, a synthetic resin film dissolved with a solvent is extruded into a cylindrical shape from an extruder nozzle 5 for blow molding.
A parison 11 for blow molding is molded.
(2) しかる後、第３図に示すように両割型４，４
を閉止し、上記ノズル５から高圧空気Ｇを吹き
込み、上記パリソン１１の中空部１２を拡張し
て割型４，４の内壁に密接した合成樹脂薄膜１
３を形成した後、ノズル５を割型４，４から後
退する。(2) After that, as shown in Fig. 3, split molds 4, 4
is closed, and high-pressure air G is blown from the nozzle 5 to expand the hollow part 12 of the parison 11 and form the synthetic resin thin film 1 in close contact with the inner walls of the split molds 4, 4.
3, the nozzle 5 is withdrawn from the split molds 4, 4.
(3) つぎに割型４，４を閉止した状態のままで割
型４，４の成形位置を90度旋回して、第１図に
実線で示す位置に変位せしめるとともに、射出
成形ノズル６を割型４，４の注入口に密接し、
前工程で形成された合成樹脂薄膜１３の中空部
１２に該合成樹脂薄膜１３と溶剤を異にする溶
解した合成樹脂を圧入充填し、成形体１０を射
出成形する。(3) Next, while keeping the split molds 4, 4 closed, turn the molding positions of the split molds 4, 4 by 90 degrees to move them to the position shown by the solid line in Fig. 1, and turn the injection molding nozzle 6. In close contact with the injection port of the split molds 4 and 4,
A melted synthetic resin using a different solvent from that of the synthetic resin thin film 13 is press-fitted into the hollow portion 12 of the synthetic resin thin film 13 formed in the previous step, and the molded body 10 is injection molded.
(4) 前記工程の成形体１０を割型４，４を拡開し
て型抜きすると、該成形体１０の表面に合成樹
脂薄膜１３が被覆した成形体が得られる。これ
を第４図に示すように、合成樹脂薄膜１３の溶
剤１４中に浸漬して皮膜を溶解せしめ、目的の
合成樹脂成形体１０を得る。このとき上記溶剤
１４は合成樹脂成形体１０の溶剤と異なるもの
であり、該合成樹脂成形体１０を溶解しないも
のでなければならない。(4) When the molded body 10 obtained in the above step is cut out by expanding the split molds 4, 4, a molded body whose surface is coated with the synthetic resin thin film 13 is obtained. As shown in FIG. 4, the synthetic resin thin film 13 is immersed in a solvent 14 to dissolve the film, thereby obtaining the desired synthetic resin molded body 10. At this time, the solvent 14 must be different from the solvent for the synthetic resin molded body 10 and must not dissolve the synthetic resin molded body 10.
上記工程によつて製造した合成樹脂成形体１０
は、射出成形の前工程においてブロー成形によつ
て割型４，４内壁に成形した合成樹脂薄膜１３
が、割型４，４の接合構造部に該合成樹脂薄膜１
３が侵入し、パーテイングラインを埋めてしまう
ため、中空部１２によつて構成されるにはパーテ
イングライン部がなく、該「実際上の射出成形
型」に充填して成形した成形体１０にはまつたく
バリが残存することがない。 Synthetic resin molded body 10 manufactured by the above process
is a synthetic resin thin film 13 formed on the inner walls of the split molds 4, 4 by blow molding in the pre-injection molding process.
However, the synthetic resin thin film 1 is applied to the joint structure of the split molds 4, 4.
3 invades and fills the parting line, so there is no parting line part in the hollow part 12, and the molded body 10 formed by filling the "practical injection mold". No burrs remain on the surface.
以上述べたように本発明に係る樹脂成形体の製
造方法によれば、成形体の表面にバリを有しない
高精度の合成樹脂成形体を得ることができ、製品
としての価値を引き上げることができる特徴を有
するものであり、本発明の合成樹脂成形製造工業
界におよぼす影響はきわめて大きい。
As described above, according to the method for manufacturing a resin molded article according to the present invention, a high-precision synthetic resin molded article without burrs on the surface of the molded article can be obtained, and the value of the product can be increased. This invention has a very large influence on the synthetic resin molding manufacturing industry.
第１図は本発明に係る樹脂成形体の製造方法の
一実施例を示す成形装置の略図、第２図はパリソ
ンの製造工程を示す説明図、第３図はブロー成形
工程を示す説明図、第４図は合成樹脂薄膜の溶解
工程を示す説明図である。
１…架台、４…割型、５…ブロー成形用押出機
ノズル、６…射出成形ノズル、１０…成形体、１
１…ブロー成形用パリソン、１２…中空部、１３
…合成樹脂薄膜、１４…溶剤。
FIG. 1 is a schematic diagram of a molding apparatus showing an embodiment of the method for manufacturing a resin molded body according to the present invention, FIG. 2 is an explanatory diagram showing the parison manufacturing process, and FIG. 3 is an explanatory diagram showing the blow molding process. FIG. 4 is an explanatory diagram showing the process of dissolving the synthetic resin thin film. DESCRIPTION OF SYMBOLS 1... Frame, 4... Split mold, 5... Extruder nozzle for blow molding, 6... Injection molding nozzle, 10... Molded object, 1
1... Parison for blow molding, 12... Hollow part, 13
...Synthetic resin thin film, 14...Solvent.
Claims (1)
膜を張設した後、該合成樹脂薄膜内の中空部に溶
剤を異にする合成樹脂を射出成形により充填する
とともに、該成形体の表面に被着した合成樹脂薄
膜を適当な溶剤によつて溶解除去することにより
前記割型の構造に起因するパーテイングライン部
のバリのない成形体を得ることを特徴とする樹脂
成形体の製造方法。1. After applying a synthetic resin thin film to the inner surface of the split mold by blow molding, the hollow part within the synthetic resin thin film is filled with a synthetic resin containing a different solvent by injection molding, and the surface of the molded body is A method for producing a resin molded article, which comprises obtaining a molded article free of burrs at the parting line caused by the structure of the split mold by dissolving and removing the deposited synthetic resin thin film using a suitable solvent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31385587A JPH01154717A (en) | 1987-12-11 | 1987-12-11 | Manufacture of resin molded body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31385587A JPH01154717A (en) | 1987-12-11 | 1987-12-11 | Manufacture of resin molded body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01154717A JPH01154717A (en) | 1989-06-16 |
| JPH0476764B2 true JPH0476764B2 (en) | 1992-12-04 |
Family
ID=18046317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31385587A Granted JPH01154717A (en) | 1987-12-11 | 1987-12-11 | Manufacture of resin molded body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01154717A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2722727B1 (en) * | 1994-07-20 | 1997-07-04 | Reydel Dev | PROCESS FOR MANUFACTURING BY SUB-MOLDING A PART, CONSISTING OF AT LEAST ONE INSITTED MOLDED INSERT |
| JP6448421B2 (en) * | 2015-03-13 | 2019-01-09 | 日本特殊陶業株式会社 | Method for producing ceramic molded body and ceramic molded body |
-
1987
- 1987-12-11 JP JP31385587A patent/JPH01154717A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01154717A (en) | 1989-06-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |