JPH0473370B2 - - Google Patents
Info
- Publication number
- JPH0473370B2 JPH0473370B2 JP60031362A JP3136285A JPH0473370B2 JP H0473370 B2 JPH0473370 B2 JP H0473370B2 JP 60031362 A JP60031362 A JP 60031362A JP 3136285 A JP3136285 A JP 3136285A JP H0473370 B2 JPH0473370 B2 JP H0473370B2
- Authority
- JP
- Japan
- Prior art keywords
- outer layer
- layer
- mold
- inner layer
- synthetic resin
- 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
- 229920003002 synthetic resin Polymers 0.000 claims description 11
- 239000000057 synthetic resin Substances 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000001746 injection moulding Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000203 mixture Substances 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14598—Coating tubular articles
- B29C45/14622—Lining the inner or outer surface of tubular articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
（発明の利用分野）
本発明は、合成樹脂製の管継手の製造法に関
し、特に詳述すれば、内外二層構造をなす合成樹
脂製管継手を射出成形法により成形し、内外層を
異なる成分の合成樹脂層とし且つ内外層の結合を
強固なものとさせるために利用される。DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a method for manufacturing a synthetic resin pipe joint, and more particularly, to a method for manufacturing a synthetic resin pipe joint having a two-layer structure, an inner and outer layer, by an injection molding method. It is used to make the inner and outer layers synthetic resin layers with different components and to strengthen the bond between the inner and outer layers.
（従来技術とその問題点）
内外二層構造をなす合成樹脂製筒状体の射出成
形方法による製造は、予め内層を射出成形により
成形し、次いで、該内層を金型に組み込み、外層
を射出成形させることで作るこの種の成形方法に
より内外二層構造の管継手本体を成形する場合、
特に、内層とは異なる樹脂材を用いて外層を射出
成形すると、外層の成形収縮により内層に歪みを
生じたり、正確な両層の寸法が得られず、さら
に、内層の外周面と外層の内周面とは、単に接す
るのみであるから、時には、その間に剥離が生
じ、内層が外層に対し相対的に回動し、一体結合
されていない不具合が生じる。(Prior art and its problems) Manufacturing a synthetic resin cylindrical body with an inner and outer two-layer structure by injection molding involves molding the inner layer in advance by injection molding, then incorporating the inner layer into a mold, and injecting the outer layer. When molding a pipe fitting body with a two-layer structure, the inner and outer layers, using this type of forming method,
In particular, when the outer layer is injection molded using a resin material different from that of the inner layer, the inner layer may become distorted due to molding shrinkage of the outer layer, accurate dimensions of both layers may not be obtained, and the outer circumferential surface of the inner layer and the inner Since the circumferential surface is merely in contact with the outer layer, peeling may sometimes occur between the inner layer and the outer layer, causing the inner layer to rotate relative to the outer layer, resulting in a problem that the inner layer is not integrally connected.
（本発明の解決すべき技術的課題）
本発明は、上記鑑み、寸法精度が良好で且つ内
外層の結合強度の良好な二層構造合成樹脂製管継
手の製造方法を提供し、前述した従来技術の不具
合を解消させることを、その解決すべき技術的課
題とする。(Technical Problems to be Solved by the Present Invention) In view of the above, the present invention provides a method for manufacturing a two-layer synthetic resin pipe joint that has good dimensional accuracy and good bonding strength between the inner and outer layers, and The technical problem to be solved is to eliminate technical defects.
（本発明の技術的手段とその作用）
本発明は、前述した課題解決のために、予め成
形され且つその内周面に凸又は凹を有する外層に
対し内層を射出成形により成形させること及び金
型の外層支持部と予め成形された外層との間に隙
間を残した状態で内層を射出成形する技術的手段
を用いる。該手段の採用は、外層と内層との間の
滑りがなく、両者を強固な一体物とし、且つ内層
を成形する射出圧が、外層を膨張（隙間により制
限されるが）させるが、この膨張の戻りが、内層
の成形収縮を吸収するので、要求寸法が確実に得
られる。(Technical means of the present invention and its effects) In order to solve the above-mentioned problems, the present invention is to form an inner layer by injection molding onto an outer layer which has been formed in advance and has convexes or concave portions on its inner circumferential surface. A technical means is used to injection mold the inner layer, leaving a gap between the outer layer support of the mold and the pre-molded outer layer. Adoption of this means prevents slippage between the outer layer and the inner layer, making them a strong integral body, and the injection pressure used to mold the inner layer causes the outer layer to expand (although limited by the gap). The return of the inner layer absorbs the molding shrinkage of the inner layer, so the required dimensions can be reliably obtained.
（実施例）
第１図および第２図に示すように、継手本体へ
外層１を従来公知の手法で成形する。合成樹脂材
からなる外層１は、その内周面に複数の離間した
凸部３又は凹部を有し、その両端は大径となつて
おり、望ましくは、大径の外周面におねじ１０が
切られる。このように予め成形された外層１に、
比較的薄肉の内層２が射出成形される。内層２は
外層１と異なる成分の合成樹脂材を用いることが
できる。この結果、たとえば、内層２に耐腐蝕性
の合成樹脂材や流れ抵抗の小さい合成樹脂材を用
いることができる。凸部３又は凹部は、外層１と
内層２との接合を強固にし、両者間の滑りをなく
し、常に、一体結合状態とさせ得る。第３図に、
外層１と内層２とを一体にした状態を示す。(Example) As shown in FIGS. 1 and 2, an outer layer 1 is formed on a joint body by a conventionally known method. The outer layer 1 made of a synthetic resin material has a plurality of spaced protrusions 3 or recesses on its inner peripheral surface, both ends of which have a large diameter, and preferably a screw 10 is provided on the outer peripheral surface of the large diameter. Be cut. In the outer layer 1 formed in advance in this way,
A relatively thin inner layer 2 is injection molded. The inner layer 2 may be made of a synthetic resin material having a different composition from that of the outer layer 1. As a result, for example, a corrosion-resistant synthetic resin material or a synthetic resin material with low flow resistance can be used for the inner layer 2. The convex portions 3 or the concave portions strengthen the bond between the outer layer 1 and the inner layer 2, eliminate slippage between them, and always maintain an integrally bonded state. In Figure 3,
A state in which the outer layer 1 and the inner layer 2 are integrated is shown.
第４図に内層２の射出成形用金型に外層１を装
着した状態を示す。圧力側金型４と、湯口１１を
有す固定側金型６との間に外層支持部５を介在さ
せる。可動側金型４は外層１の一方の端部を受け
る環状溝部８を有し、該溝部８の底部に、外層１
の端面に、密着する入子７を配す。外層支持部５
の右端側に大径の段付き部８′を設け、且つ固定
側金型の環状溝部に入子７′を配し、この入子
７′を外層１の側端面に密接させる。可動側金型
４および外層支持部５と外層１の外周面との間
に、金型に外層１を組み込んだ時、隙間を残すよ
うにする。可動側金型４の外層１の中央孔内に延
出する部分および上金型６の外層１の中央孔より
小さく突出する部分と、外層１の内周面との間に
内層２の肉厚に相当する空間を作る。 FIG. 4 shows a state in which the outer layer 1 is attached to the injection mold for the inner layer 2. An outer layer support portion 5 is interposed between the pressure side mold 4 and the stationary side mold 6 having a sprue 11. The movable mold 4 has an annular groove 8 for receiving one end of the outer layer 1, and the outer layer 1 is placed at the bottom of the groove 8.
An insert 7 is placed on the end face of the insert 7 in close contact with the end face. Outer layer support part 5
A large-diameter stepped portion 8' is provided on the right end side of the die, and a nest 7' is disposed in the annular groove of the stationary mold, and this nest 7' is brought into close contact with the side end surface of the outer layer 1. A gap is left between the movable mold 4 and the outer layer support part 5 and the outer peripheral surface of the outer layer 1 when the outer layer 1 is assembled into the mold. There is a wall thickness of the inner layer 2 between the portion of the movable mold 4 that extends into the center hole of the outer layer 1 and the portion of the upper mold 6 that projects smaller than the center hole of the outer layer 1 and the inner peripheral surface of the outer layer 1. Create a space that corresponds to
第４図に示す状態に外層１を金型に組み込んだ
後、湯口１１を介して合成樹脂材の湯を空間に射
出する。内層２となる空間に充満した湯圧（射出
圧）により外層１は膨張するが、この膨張は金型
と外層１の外周面との間の隙間に、外層を埋める
ことで制約される。射出后、内層２は成形収縮す
るが、この収縮は膨張した外層１の戻りによつて
吸収され、内層の歪みはなく、又、正確な寸法取
りが可能となる。入子７，７′と外層１の側端面
との密接は湯を外層の外周面側にまわることを防
止する。入子７，７′は外層１の長さ方向の寸法
に応じその厚みを変え、又、外層支持部５を変え
ればよい。 After the outer layer 1 is assembled into the mold in the state shown in FIG. 4, synthetic resin hot water is injected into the space through the sprue 11. The outer layer 1 expands due to the hot water pressure (injection pressure) filling the space that will become the inner layer 2, but this expansion is restricted by filling the gap between the mold and the outer peripheral surface of the outer layer 1 with the outer layer. After injection, the inner layer 2 undergoes molding shrinkage, but this shrinkage is absorbed by the return of the expanded outer layer 1, so there is no distortion of the inner layer, and accurate dimensioning becomes possible. The close contact between the inserts 7, 7' and the side end surfaces of the outer layer 1 prevents hot water from flowing toward the outer peripheral surface of the outer layer. The thickness of the inserts 7, 7' may be changed depending on the lengthwise dimension of the outer layer 1, and the outer layer support portion 5 may also be changed.
（効果）
内層の材料選択が自由となるので、継手内を流
れる流体の性質に応じた樹脂材で内層を成形でき
る。従つて、継手の腐蝕もなく耐久性を向上させ
得る。内層の射出成形も、外層の外周面と金型と
の間に、外層の膨張に応じた隙間を残すのみであ
るから格別困難な手法を必要としない。(Effects) Since the material for the inner layer can be freely selected, the inner layer can be molded with a resin material that matches the properties of the fluid flowing within the joint. Therefore, there is no corrosion of the joint and the durability can be improved. Injection molding of the inner layer also does not require particularly difficult techniques, since only a gap corresponding to the expansion of the outer layer is left between the outer circumferential surface of the outer layer and the mold.
第１図は外層を示す断面図、第２図は外層の側
面図、第３図は継手の断面図、第４図は継手の内
層射出をする金型を示す断面図である。
図中：１……外層、２……内層、３……凸部、
４，５，６……金型。
FIG. 1 is a sectional view showing the outer layer, FIG. 2 is a side view of the outer layer, FIG. 3 is a sectional view of the joint, and FIG. 4 is a sectional view showing a mold for injecting the inner layer of the joint. In the figure: 1...outer layer, 2...inner layer, 3...convex part,
4, 5, 6... Mold.
Claims (1)
を射出成形する第１工程、内層の射出成形用金型
に前記外層を該金型と該外層の外周面との間に隙
間を残した状態で組み込む第２工程、および前記
外層の内周側に内層を射出成形する第３工程より
なり、前記隙間が前記内層の成形収縮量に略相当
されていることを特徴とする二層構造をなす合成
樹脂製の管継手製造法。1. The first step of injection molding a cylindrical outer layer having a convex or concave portion on the inner circumferential wall surface, the outer layer being placed in an injection mold for the inner layer with a gap left between the mold and the outer circumferential surface of the outer layer. and a third step of injection molding an inner layer on the inner peripheral side of the outer layer, forming a two-layer structure characterized in that the gap is approximately equivalent to the amount of molding shrinkage of the inner layer. Manufacturing method for synthetic resin pipe fittings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3136285A JPS61189913A (en) | 1985-02-19 | 1985-02-19 | Manufacture of pipe joining of synthetic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3136285A JPS61189913A (en) | 1985-02-19 | 1985-02-19 | Manufacture of pipe joining of synthetic resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61189913A JPS61189913A (en) | 1986-08-23 |
| JPH0473370B2 true JPH0473370B2 (en) | 1992-11-20 |
Family
ID=12329127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3136285A Granted JPS61189913A (en) | 1985-02-19 | 1985-02-19 | Manufacture of pipe joining of synthetic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61189913A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4942008A (en) * | 1985-07-10 | 1990-07-17 | Cahill John W | Process for molding a multiple layer structure |
| AU640671B2 (en) * | 1988-08-25 | 1993-09-02 | John W. Cahill | A process for molding a multiple layer structure and a container made therefrom |
| AU677729B2 (en) * | 1994-01-28 | 1997-05-01 | Francis Ambrose Moore | Method of manufacturing articles using plastic injection moulding |
| ATE509417T1 (en) * | 2007-09-21 | 2011-05-15 | Grundfos Management As | SPLIT TUBE AND METHOD FOR PRODUCING A SPLIT TUBE |
| RU2362942C1 (en) * | 2007-12-27 | 2009-07-27 | Малик Фавзавиевич Гайсин | Flow string (fs) with internal coating eliminating sediments and method for applying this coating |
| DE102009054915A1 (en) * | 2009-12-18 | 2011-06-22 | Robert Bosch GmbH, 70469 | Injection molding process for producing a functional part with a recess |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5563232A (en) * | 1978-10-18 | 1980-05-13 | Battenfeld Maschfab | Pipe joint* preparation of pipe joint and its tool |
-
1985
- 1985-02-19 JP JP3136285A patent/JPS61189913A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5563232A (en) * | 1978-10-18 | 1980-05-13 | Battenfeld Maschfab | Pipe joint* preparation of pipe joint and its tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61189913A (en) | 1986-08-23 |
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