JPS61189913A - Manufacture of pipe joining of synthetic resin - Google Patents

Manufacture of pipe joining of synthetic resin

Info

Publication number
JPS61189913A
JPS61189913A JP3136285A JP3136285A JPS61189913A JP S61189913 A JPS61189913 A JP S61189913A JP 3136285 A JP3136285 A JP 3136285A JP 3136285 A JP3136285 A JP 3136285A JP S61189913 A JPS61189913 A JP S61189913A
Authority
JP
Japan
Prior art keywords
outer layer
layer
mold
inner layer
clearance
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.)
Granted
Application number
JP3136285A
Other languages
Japanese (ja)
Other versions
JPH0473370B2 (en
Inventor
Masami Sudo
須藤　正巳
Takeshi Nagai
武 永井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KENSETSU BUHIN KK
Riken Corp
Original Assignee
KENSETSU BUHIN KK
Riken Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by KENSETSU BUHIN KK, Riken Corp filed Critical KENSETSU BUHIN KK
Priority to JP3136285A priority Critical patent/JPS61189913A/en
Publication of JPS61189913A publication Critical patent/JPS61189913A/en
Publication of JPH0473370B2 publication Critical patent/JPH0473370B2/ja
Granted legal-status Critical Current

Links

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

Abstract

PURPOSE:To offer a manufacture of a pipe fitting of double layer structure synthetic resin excellent in dimensional precision and in the bonding strength between the inner and outer layers by leaving a clearance between the mold of the outer layer and the outer circumference surface of the outer layer in the injection mold of the inner layer and equalizing the clearance nearly to the amount of molding shrinkage of the inner layer. CONSTITUTION:After the outer layer 1 is set into the mold leaving a clearance among a movable mold 4, the outer layer supporting part 5 and the outer circumference surface of the outer layer 1, synthetic resin fluid is injected into the space. At this time, the outer layer 1 is expanded by the pressure of the fluid with which the space of the inner layer 2 is filled but this expansion is limited by filling the clearance between the mold and the outer circumference surface of the outer layer 1 with the outer layer 1. After injection of resin, molding shrinkage occurs in the inner layer 2 but this shrinkage is absorbed by the return of the outer layer 1, no strain occurs in the inner layer and precise size can be obtained. Durability is improved. The injection molding of the inner layer is carried out only by leaving a clearance corresponding to expansion of the outer layer between the outer circumference surface of the outer layer and the mold. No special difficult method is required.

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 using this type of molding method to mold a pipe fitting body with a two-layered structure, especially when the outer layer is injection molded using a different resin material than the inner layer, the inner layer may become distorted due to molding shrinkage of the outer layer. In addition, because the outer circumferential surface of the inner layer and the inner circumferential surface of the outer layer are merely in contact, delamination may occur between them, causing the inner layer to be relative to the outer layer. This may cause problems such as rotation and not being 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、前述した従来技術ヂ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 ensures that there is no slippage between the outer layer and the inner layer, making them a strong integral body, and that the injection pressure for molding 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っており、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. Outer layer 1 made of synthetic resin material
has a plurality of spaced apart protrusions 3 or recesses on its inner circumferential surface, both ends of which have a large diameter, and preferably a thread 10 is cut on the large diameter outer circumferential surface. A relatively thin inner layer 2 is injection molded onto the outer layer 1 which has been formed in advance in this manner. 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. FIG. 3 shows a state in which the outer layer 1 and the inner layer 2 are integrated.

第４図に内層２の射出成形用金型に外層ｌ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。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 that receives one end of the outer layer 1, and a nest 7 that closely contacts the end surface of the outer layer 1 is disposed at the bottom of the groove 8.

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。A large-diameter stepped part 8' is provided on the right end side of the outer layer support part 5, and an insert 7' is arranged in the annular groove of the stationary mold.
' is brought into close contact with the side end surface of the outer layer 1. Between the movable side mold 4 and the outer layer support part 5 and the outer peripheral surface of the outer layer 1, the outer layer 1 is attached to the mold.
Make sure to leave a gap when installing. Movable side mold 4
A space corresponding to the thickness of the inner layer 2 is provided between a portion of the upper mold 6 that extends into the center hole of the outer layer 1 and a 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. make.

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
よって吸収され、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ｌ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. inner layer 2
The outer layer 1 expands due to the hot water pressure (injection pressure) filling the space, 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, inner layer 2
Although the molding shrinks during molding, 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 insert 7.7' and the side end surface of the outer layer l prevents hot water from flowing around the outer peripheral surface of the outer layer. The thickness of the inserts 7, 7' may be changed depending on the longitudinal 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。従って、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 peripheral surface of the outer layer and the mold.

【図面の簡単な説明】[Brief explanation of the drawing]

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 portion, 4.5.6...mold.

Claims (1)

【特許請求の範囲】[Claims] 内周壁面に凸または凹部を有する円筒状外層を射出成形
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。A first step of injection molding a cylindrical outer layer having a convex or concave portion on the inner peripheral wall surface, the outer layer is placed in an injection mold for the inner layer with a gap left between the mold and the outer peripheral surface of the outer layer. A composition forming a two-layer structure, comprising a second step of incorporating, and a third step of injection molding an inner layer on the inner peripheral side of the outer layer, the gap being approximately equivalent to the amount of molding shrinkage of the inner layer. Manufacturing method for resin pipe fittings.
JP3136285A 1985-02-19 1985-02-19 Manufacture of pipe joining of synthetic resin Granted JPS61189913A (en)

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 true JPS61189913A (en) 1986-08-23
JPH0473370B2 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)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU640671B2 (en) * 1988-08-25 1993-09-02 John W. Cahill A process for molding a multiple layer structure and a container made therefrom
US5443767A (en) * 1985-07-10 1995-08-22 Pepsico., Inc. Process for molding a multiple structure and a container made therein
AU677729B2 (en) * 1994-01-28 1997-05-01 Francis Ambrose Moore Method of manufacturing articles using plastic injection moulding
EP2040352A1 (en) * 2007-09-21 2009-03-25 Grundfos Management A/S Airgap sleeve and manufacturing method thereof
EP2236896A2 (en) * 2007-12-27 2010-10-06 Malik Favzavievich Gaysin Tubing with an inner coating protecting it against deposits and a method for applying said coating
WO2011072935A1 (en) * 2009-12-18 2011-06-23 Robert Bosch Gmbh Injection-moulding process for producing a functional part with a clearance

Citations (1)

* Cited by examiner, † Cited by third party
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
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

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5443767A (en) * 1985-07-10 1995-08-22 Pepsico., Inc. Process for molding a multiple structure and a container made therein
US5759654A (en) * 1985-07-10 1998-06-02 Pepsico Inc. Multiple layer preform
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
EP2040352A1 (en) * 2007-09-21 2009-03-25 Grundfos Management A/S Airgap sleeve and manufacturing method thereof
WO2009039932A1 (en) * 2007-09-21 2009-04-02 Grundfos Management A/S Can and method for the production of a can
EP2040352B2 (en) † 2007-09-21 2014-11-19 Grundfos Management A/S Airgap sleeve and manufacturing method thereof
EP2236896A2 (en) * 2007-12-27 2010-10-06 Malik Favzavievich Gaysin Tubing with an inner coating protecting it against deposits and a method for applying said coating
EP2236896A4 (en) * 2007-12-27 2014-05-21 Malik Favzavievich Gaysin Tubing with an inner coating protecting it against deposits and a method for applying said coating
WO2011072935A1 (en) * 2009-12-18 2011-06-23 Robert Bosch Gmbh Injection-moulding process for producing a functional part with a clearance
CN102652053A (en) * 2009-12-18 2012-08-29 罗伯特·博世有限公司 Injection-moulding process for producing a functional part with a clearance
US9296137B2 (en) 2009-12-18 2016-03-29 Robert Bosch Gmbh Injection molding method for manufacturing a functional part having a recess

Also Published As

Publication number Publication date
JPH0473370B2 (en) 1992-11-20

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