JP3733778B2 - Manufacturing method of resin products - Google Patents

Manufacturing method of resin products Download PDF

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Publication number
JP3733778B2
JP3733778B2 JP08347199A JP8347199A JP3733778B2 JP 3733778 B2 JP3733778 B2 JP 3733778B2 JP 08347199 A JP08347199 A JP 08347199A JP 8347199 A JP8347199 A JP 8347199A JP 3733778 B2 JP3733778 B2 JP 3733778B2
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Japan
Prior art keywords
resin
passage
toilet seat
back plate
mold
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JP08347199A
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Japanese (ja)
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JP2000272014A (en
Inventor
敦之 水野
正規 梶原
貞行 門奈
嘉隆 近藤
幸雄 中西
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Priority to JP08347199A priority Critical patent/JP3733778B2/en
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    • 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
    • B29C45/14467—Joining articles or parts of a single article
    • 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
    • B29C45/14467—Joining articles or parts of a single article
    • B29C2045/14524—Joining articles or parts of a single article making hollow articles
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/769—Sanitary equipment
    • B29L2031/7694—Closets, toilets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/771—Seats

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、便座をはじめとして、ポットや炊飯器やジャー等の蓋、さらには食器洗い器などの家庭用品、そして流体を収納するタンクなどに適用される樹脂製品の製造方法に関するものである。
【０００２】
【従来の技術】
従来より、複数の樹脂製部品を接合して樹脂製品を製造することが行われていいる。例えば、図１０に示す樹脂製品は便座１０であって、臀部が接触する便座本体１３と便座裏板１４とを樹脂製部品１とし、これらを接合することによって形成されている。便座本体１３と便座裏板１４を接合するにあたっては、まず、便座本体１３と便座裏板１４を金型６にインサートすると共に金型６内で便座本体１３と便座裏板１４を組み合わせる。この時、便座本体１３と便座裏板１４の端部同士が接合されて接合部２が形成されるが、この接合部２には便座本体１３と便座裏板１４に亘って通路３が形成されており、この通路３は便座裏板１４の表面側で開口されている。次に、熱可塑性樹脂などの接合用樹脂４を射出成形機等により金型６内に射出して通路３にその開口から接合用樹脂４を充填し、通路３に充填された接合用樹脂４で便座本体１３と便座裏板１４を接着して接合する。このようにして便座１０が形成されるのである。
【０００３】
上記のように便座本体１３と便座裏板１４を金型６にインサートした状態において、接合部２の表面と金型６の成形面を完全に密着させることは難しく、接合部２の表面と金型６の成形面の間には隙間が形成されている。よって、接合用樹脂４を充填する際にこの隙間に接合用樹脂４が流れ込み、通路３からはみ出た接合用樹脂４により便座１０の外観が損なわれたり便座本体１３と便座裏板１４の接合不良が起こったりすることがある。
【０００４】
そこで図１１（ａ）に示すように、金型６の成形面に食い込み突起５０を設け、便座本体１３と便座裏板１４を金型６にインサートした時に、この食い込み突起５０を通路３の開口の周辺において接合部２の表面に食い込ませるようにしており、食い込み突起５０で隙間を遮断して隙間に接合用樹脂４が流れ込むのを防止するようにしている。
【０００５】
【発明が解決しようとする課題】
しかし従来の方法で樹脂製部品を接合すると、図１１（ｂ）に示すように、便器１０の接合部２の表面に食い込み突起５０が食い込んだ跡が残り、便器１０の外観が低下するという問題があった。また、食い込み突起５０が食い込んだ部分から便器１０にクラックや割れが生じやすいという問題があった。
【０００６】
さらに、樹脂製部品１の出来上がり寸法のずれや変形や反り等の要因で、食い込み突起５０が所定の位置からずれて食い込むことがあり、このために、食い込み突起が役目を果たさなくなって、図１２（ａ）（ｂ）に示すように接合部２の表面と金型６の成形面の隙間に接合用樹脂４が流れ込み、便器１０の外観が低下したり樹脂製部品１の接合不良が起こったりするという問題があった。
【０００７】
加えて、一回の接合毎に食い込み突起５０を樹脂製部品１に食い込ませるので、接合毎に食い込み突起５０に大きな力がかかることになり、このために、食い込み突起５０の摩耗や破損が起こりやすく、金型６の寿命が短いという問題があった。
【０００８】
本発明は上記の点に鑑みてなされたものであり、樹脂製品の外観が低下することがなく、またクラックや割れ及び接合不良が生じにくい樹脂製品を形成することができ、さらに金型の寿命を長くすることができる樹脂製品の製造方法を提供することを目的とするものである。
【０００９】
【課題を解決するための手段】
本発明の請求項１に係る樹脂製品の製造方法は、複数の樹脂製部品１の接合部２に通路３を形成し、通路３に接合用樹脂４を充填することにより、複数の樹脂製部品１を接合用樹脂４で接合する樹脂製品の製造方法において、接合用樹脂４が通路３の外へはみ出すことを防止するための突起部５を少なくとも一つの樹脂製部品１に設け、前記突起部５は通路３の縁部に通路３側に傾いて通路３の開口方向に突出するように設け、前記突起部５に金型６を押圧させて通路３に倒れ込ませた後に通路３に接合用樹脂４を充填することを特徴とするものである。
【００１１】
また本発明の請求項２に係る樹脂製品の製造方法は、請求項１の構成に加えて、突起部５の先端が鋭角に形成されていることを特徴とするものである。
【００１２】
【発明の実施の形態】
以下、本発明の実施の形態を説明する。
【００１３】
この実施の形態においては、樹脂製品として図２乃至図６に示すような便座１０の製造方法を説明するが、本発明はこれに限定されるものではない。この便座１０は平面視で略ドーナツ形状に形成されており、略中央部に便座開口部１１が設けられていると共に便座１０の裏面には複数個の足部材３１が設けられている。また、便座１０は暖房便座であって、内部に複数個の発熱体１２が設けられており、各発熱体１２には便座１０から導出される電線１８を介して電気が供給され、この給電で発熱するように形成されている。この便座１０は樹脂製部品１である便座本体１３とこれに対抗する便座裏板１４を組み合わせて接合することによって形成されている。また、便座１０の全長に亘って便座本体１３と便座裏板１４で囲まれる空間部５８が形成されており、この空間部５８により便座１０の断熱性を高めるように形成されている。便座本体１３及び便座裏板１４はＡＢＳ樹脂（アクリロニトリル、ブタジエン、スチレンの共重合樹脂）、ポリプロピレン樹脂をはじめとして、適宜な樹脂を用いて形成されている。
【００１４】
便座本体１３は便座開口部１１を構成する本体開口部３０を略中央部に有して平面視で略ドーナツ形状に形成されるものであって、図６に示すように、便座１０の臀部側となる接触部２０と、本体開口部３０を囲うように形成される内周片２１と、便座１０の外周を構成する外周片２２とで断面略Ｕ字状に形成されている。内周片２１には裏面側に開口する内側切欠部２３が全周に亘って設けられており、また、外周片２２には裏面側に開口する外側切欠部２４が全周に亘って設けられている。内側切欠部２３は内側差込片２５と内側周片２６で挟まれて形成されると共に、外側切欠部２４は外側差込片４５と外側周片４６で挟まれて形成されているが、内側周片２６の裏面及び外側周片４６の裏面において、内側切欠部２３及び外側切欠部２４の開口縁部には、図１に示すような突起部５が内側周片２６及び外側周片４６の全長に亘って設けられている。この突起部５の先端は鋭角に形成されている。
【００１５】
便座裏板１４は便座開口部１１を構成する裏板開口部３２を略中央部に有して平面視で便座本体１３に対応する略ドーナツ形状に形成されるものであって、図６に示すように、便座１０の便器側の面を構成するものである。便座裏板１４の内側端部（裏板開口部３２側の端部）には内側補強部３４が便座裏板１４の全長に亘って設けられており、内側補強部３４には裏板開口部３２側に突出する断面略Ｌ字状の内側係止片３５が内側補強部３４の全長に亘って設けられている。また、図１に示すように、内側係止片３５の裏面には突起部５が内側係止片３５の全長に亘って突設されている。さらに、便座裏板１４の外側端部（便座１０の外周側の端部）には外側補強部３６が便座裏板１４の全長に亘って設けられており、外側補強部３６の外面には断面略Ｌ字状の外側係止片３７が外側補強部３６の全長に亘って突設されている。また、図１に示すように、外側係止片３７の裏面には突起部５が外側係止片３７の全長に亘って突設されている。この突起部５の先端は鋭角に形成されている。
【００１６】
上記の便座本体１３と便座裏板１４を接合するにあたっては、上型４０と下型４１からなる金型６を用いて行われる。上型４０にはその下面に開口する裏板収納部４２が凹設されており、裏板収納部４２は便座裏板１４がはめ込み可能な形状に形成されている。上型４０にはその上面と裏板収納部４２とに開口する複数の供給部４３が形成されており、裏板収納部４２側の供給部４３の開口は導入口４４として形成されている。また、下型４１にはその上面に開口する本体収納部４５が凹設されており、本体収納部４５は便座本体１３がはめ込み可能な形状に形成されている。
【００１７】
そして、便座本体１３と便座裏板１４を接合するにあたっては次のようにして行う。まず、図７に示すように便座本体１３と便座裏板１４を対向させて配置し、内側切欠部２３に内側係止片３５を差し込むと共に内側係止片３５と内側補強部３４の間に内側差込片２５を差し込み、外側切欠部２４に外側係止片３７を差し込むと共に外側係止片３７と外側補強部３６の間に外側差込片４５を差し込むことによって、内側係止片３５と内側差込片２５の係止及び外側係止片３７と外側差込片４５の係止で便座本体１３と便座裏板１４を組み合わせる。このようにして便座本体１３と便座裏板１４を組み合わせることによって、図１（ａ）で示すように、便座本体１３と便座裏板１４の接合部２に、内側切欠部２３と内側係止片３５からなる内側通路３ａ、及び外側切欠部２４と外側係止片３７からなる外側通路３ｂが通路３として形成される。また、内側通路３ａの縁部の突起部５は内側通路３ａ側に傾いて裏面側に突出するように位置し、外側通路３ｂの縁部の突起部５は外側通路３ｂ側に傾いて裏面側に突出するように位置する。
【００１８】
次に、便座本体１３と便座裏板１４を組み合わせたものを、図８に示すように、上型４０と下型４１の間にセットする。この時、便座本体１３は下型４１の本体収納部４５に収納されると共に便座裏板１４は上型４０の裏板収納部４２に収納される。また、上型４０と下型４１を型締めすることによって、図１（ｂ）に示すように、裏板収納部４２で突起部５が押圧されて内側通路３ａ内及び外側通路３ｂ内に倒れ込む。倒れ込んだ突起部５において金型６（の上型４０）との接触面と通路３側方向へなす角、すなわち、倒れ込んだ突起部５の先端の角度αは鋭角に形成される。さらに、内側通路３ａの開口及び外側通路３ｂの開口に対応して導入口４４が位置することになる。導入口４４は接合用樹脂４が内側通路３ａ及び外側通路３ｂにほぼ同じ長さで流入できるような位置に形成されるのが好ましく、具体的には、導入口４４を内側通路３ａあるいは外側通路３ｂに沿って一定の間隔で位置させるのが好ましい。
【００１９】
次に、供給部４３及び導入口４４を通じて接合用樹脂４を内側通路３ａ及び外側通路３ｂに射出成形等で注入し、図１（ｃ）に示すように、内側通路３ａ及び外側通路３ｂが接合用樹脂４で完全に満たされるように充填する。この時、内側通路３ａ及び外側通路３ｂの開口縁部には突起部５が突設されているために、接合用樹脂４が内側通路３ａ及び外側通路３ｂから外へはみ出さない（漏れ出さない）ようにすることができる。接合用樹脂４としてはＡＢＳ樹脂やポリプロピレン樹脂などの熱可塑性樹脂を用いることができ、接合用樹脂４を溶融状態にして注入し充填する。この時、接合用樹脂４の熱の作用で突起部５の先端が溶融し、突起部５の先端が丸みを帯びることになる。この後、充填した接合用樹脂４を冷却硬化し、接合部２において便座本体１３と便座裏板１４を冷却硬化した接合用樹脂４で強固に固着して接合する。この時、先端に丸みを帯びた突起部５が接合用樹脂４に食い込むことになる。次に、図９に示すように上型４０と下型４１を型開きして便座本体１３と便座裏板１４の一体化物を脱型し、便座裏板１４の裏面に足部材３１を取り付けることによって、便座１０を形成することができる。
【００２０】
このように本発明では、図６に示すように複数の樹脂製部品１の接合部２に形成した通路３に接合用樹脂４を充填して冷却硬化し、複数の樹脂製部品１を接合用樹脂４で接合する樹脂製品の製造方法において、接合用樹脂４が通路３の外へはみ出すことを防止するための突起部５を、接合用樹脂４が充填される通路３の開口縁部に設けるので、突起部５がシール手段となって接合用樹脂４が通路３から外へはみ出さない（漏れ出さない）ようにすることができる。また、従来例のように樹脂製部品１に食い込むような食い込み突起を用いないので、樹脂製品の表面に食い込み突起が食い込んだ跡が残らないようにすることができ、樹脂製品の外観が低下するようなことがなく、しかも樹脂製品にクラックや割れが生じにくいものであり、加えて、金型６の摩耗や破損が起こりにくく、金型６の寿命を長くすることができるものである。さらに、樹脂製部品１の出来上がり寸法のずれや変形や反り等が多少生じていても、突起部５はほぼ通路３の開口縁部に形成されることになって、突起部５で接合用樹脂４のはみ出しを確実に防止することができ、樹脂製品の外観が低下したり樹脂製部品の接合不良が起こったりするのを防ぐことができるものである。
【００２１】
また、突起部５は金型６の型締めの際に押圧されて通路３に倒れ込むので、樹脂製品の外面に突出しないようにすることができ、突起部５により樹脂製品の外観が低下しないようにすることができるものであり、しかも、金型６と樹脂製部品１の密着性を突起部５の部分で高くすることができるものである。
【００２２】
さらに、倒れ込んだ突起部５において金型６との接触面と通路３側方向へなす角、すなわち、倒れ込んだ突起部５の先端の角度αが鋭角に形成されているので、硬化した接合用樹脂４に突起部５を食い込ませることができ、複数の樹脂製部品１の接合強度を高めることができるものであり、しかも、突起部５の先端を鈍角に形成するよりも、樹脂製品の外面への接合用樹脂４のはみ出しを起こりにくくすることができるものである。
【００２３】
尚、通路３の大きさや形状及び接合用樹脂４の充填の条件等は、各種の樹脂製品に応じて設定されるが、例えば、上記のような便座１０の場合、通路３の大きさは断面で深さ４ｍｍ×幅２ｍｍ程度に設定される。また、接合用樹脂４の充填の際の流動長は、樹脂温度２８０℃で射出圧力５００ｋｇｆ／ｃｍ2の設備条件で深さ４ｍｍ×幅２ｍｍの通路３の場合、例えば、５３０ｍｍに設定することができる。さらに、内側通路３ａに対応する位置に開口する導入口４４は三個、外側通路３ｂに対応する位置に開口する導入口４４は五個にそれぞれ設定することができる。
【００２４】
【発明の効果】
上記のように本発明の請求項１の発明は、複数の樹脂製部品の接合部に通路を形成し、通路に接合用樹脂を充填することにより、複数の樹脂製部品を接合用樹脂で接合する樹脂製品の製造方法において、接合用樹脂が通路の外へはみ出すことを防止するための突起部を少なくとも一つの樹脂製部品に設け、前記突起部は通路の縁部に通路側に傾いて通路の開口方向に突出するように設け、前記突起部に金型を押圧させて通路に倒れ込ませた後に通路に接合用樹脂を充填するので、突起部がシール手段となって接合用樹脂が通路から外へはみ出さないようにすることができ、また樹脂製部品に食い込むような食い込み突起を用いないので、樹脂製品の表面に食い込み突起が食い込んだ跡が残らないようにすることができ、樹脂製品の外観が低下するようなことがなく、しかも樹脂製品にクラックや割れが生じにくいものであり、加えて、金型の摩耗や破損が起こりにくく、金型の寿命を長くすることができるものである。さらに、樹脂製部品の出来上がり寸法のずれや変形や反り等が多少生じていても、突起部はほぼ通路の開口縁部に形成されることになって、突起部で接合用樹脂のはみ出しを確実に防止することができ、樹脂製品の外観が低下したり樹脂製部品の接合不良が起こったりするのを防ぐことができるものである。更に、突起部を樹脂製品の外面に突出しないようにすることができ、突起部により樹脂製品の外観が低下しないようにすることができるものであり、しかも、金型と樹脂製部品の密着性を突起部の部分で高くすることができるものである。
【００２６】
また、本発明の請求項２の発明は、突起部の先端が鋭角に形成されているので、接合用樹脂に突起部を食い込ませることができ、複数の樹脂製部品の接合強度を高めることができるものであり、しかも、突起部の先端を鈍角に形成するよりも、樹脂製品の外面への接合用樹脂のはみ出しを起こりにくくすることができるものである。
【図面の簡単な説明】
【図１】本発明の実施の形態の一例を示す（ａ）（ｂ）（ｃ）は一部の断面図である。
【図２】同上の樹脂製品を示す斜視図である。
【図３】同上の（ａ）は断面図、（ｂ）は概略図である。
【図４】同上の平面図である。
【図５】同上の底面図である。
【図６】同上の図３（ｂ）のＡ−Ａ断面図である。
【図７】同上の断面図である。
【図８】同上の断面図である。
【図９】同上の断面図である。
【図１０】従来例を示す一部の断面図である。
【図１１】（ａ）（ｂ）は従来例を示す一部の断面図である。
【図１２】（ａ）（ｂ）は従来例を示す一部の断面図である。
【符号の説明】
１ 樹脂製部品
２ 接合部
３ 通路
４ 接合用樹脂
５ 突起部
６ 金型[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin product manufacturing method applied to toilet seats, lids for pots, rice cookers, jars, etc., household items such as dishwashers, and tanks for storing fluids.
[0002]
[Prior art]
Conventionally, a resin product is manufactured by joining a plurality of resin parts. For example, the resin product shown in FIG. 10 is the toilet seat 10 and is formed by joining the toilet seat body 13 and the toilet seat back plate 14 with which the buttocks contact with each other as the resin part 1. In joining the toilet seat body 13 and the toilet seat back plate 14, first, the toilet seat body 13 and the toilet seat back plate 14 are inserted into the mold 6 and the toilet seat body 13 and the toilet seat back plate 14 are combined in the mold 6. At this time, the ends of the toilet seat body 13 and the toilet seat back plate 14 are joined together to form the joined portion 2, and a passage 3 is formed in the joined portion 2 across the toilet seat body 13 and the toilet seat back plate 14. The passage 3 is opened on the surface side of the toilet seat back plate 14. Next, the bonding resin 4 such as a thermoplastic resin is injected into the mold 6 by an injection molding machine or the like, and the bonding resin 4 is filled into the passage 3 from the opening, and the bonding resin 4 filled in the passage 3 is filled. Then, the toilet seat body 13 and the toilet seat back plate 14 are bonded and joined. Thus, the toilet seat 10 is formed.
[0003]
In the state where the toilet seat body 13 and the toilet seat back plate 14 are inserted into the mold 6 as described above, it is difficult to completely adhere the surface of the joint portion 2 and the molding surface of the mold 6, and the surface of the joint portion 2 and the mold A gap is formed between the molding surfaces of the mold 6. Therefore, when the bonding resin 4 is filled, the bonding resin 4 flows into this gap, and the appearance of the toilet seat 10 is damaged by the bonding resin 4 protruding from the passage 3 or the bonding between the toilet seat body 13 and the toilet seat back plate 14 is poor. May happen.
[0004]
Therefore, as shown in FIG. 11A, when the biting protrusion 50 is provided on the molding surface of the mold 6 and the toilet seat body 13 and the toilet seat back plate 14 are inserted into the mold 6, the biting protrusion 50 is formed in the opening of the passage 3. In the periphery, the gap is cut into the surface of the bonding portion 2, and the gaps are cut off by the biting protrusions 50 to prevent the bonding resin 4 from flowing into the gap.
[0005]
[Problems to be solved by the invention]
However, when resin parts are joined by the conventional method, as shown in FIG. 11B, the trace of the biting protrusion 50 remains on the surface of the joint portion 2 of the toilet 10, and the appearance of the toilet 10 is deteriorated. was there. In addition, there is a problem that the toilet 10 is likely to be cracked or broken from the portion where the biting protrusion 50 bites.
[0006]
Further, the biting protrusion 50 may be displaced from a predetermined position due to a deviation, deformation, warpage, or the like of the finished dimension of the resin part 1, and for this reason, the biting protrusion does not play a role. (A) As shown in (b), the bonding resin 4 flows into the gap between the surface of the bonding portion 2 and the molding surface of the mold 6, and the appearance of the toilet 10 is deteriorated or the bonding of the resin part 1 is caused. There was a problem to do.
[0007]
In addition, since the biting protrusion 50 bites into the resin part 1 for each joining, a large force is applied to the biting protrusion 50 for each joining, and this causes wear and breakage of the biting protrusion 50. There was a problem that it was easy and the life of the mold 6 was short.
[0008]
The present invention has been made in view of the above points, and it is possible to form a resin product in which the appearance of the resin product does not deteriorate, cracks, cracks, and bonding defects are less likely to occur. It is an object of the present invention to provide a method for producing a resin product that can lengthen the length.
[0009]
[Means for Solving the Problems]
The method for manufacturing a resin product according to claim 1 of the present invention includes forming a passage 3 in the joint portion 2 of the plurality of resin parts 1 and filling the passage 3 with the bonding resin 4 to thereby form a plurality of resin parts. In the method of manufacturing a resin product in which the bonding resin 4 is bonded to the bonding resin 4, the protruding portion 5 for preventing the bonding resin 4 from protruding outside the passage 3 is provided on at least one resin component 1, and the protruding portion 5 is provided at the edge of the passage 3 so as to incline toward the passage 3 and protrude in the opening direction of the passage 3, and is pressed into the passage 3 by pressing the mold 6 against the projection 5 and then joined to the passage 3. the use resin 4 in which characterized that you fill.
[0011]
The resin product manufacturing method according to claim 2 of the present invention is characterized in that, in addition to the structure of claim 1, the tip of the protrusion 5 is formed at an acute angle.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0013]
In this embodiment, a method of manufacturing a toilet seat 10 as shown in FIGS. 2 to 6 will be described as a resin product, but the present invention is not limited to this. The toilet seat 10 is formed in a substantially donut shape in a plan view. A toilet seat opening 11 is provided in a substantially central portion, and a plurality of foot members 31 are provided on the back surface of the toilet seat 10. The toilet seat 10 is a heating toilet seat, and a plurality of heating elements 12 are provided therein. Electricity is supplied to each heating element 12 via an electric wire 18 led out of the toilet seat 10, It is formed to generate heat. The toilet seat 10 is formed by combining and combining a toilet seat body 13 that is a resin part 1 and a toilet seat back plate 14 that opposes the toilet seat body 13. Further, a space 58 surrounded by the toilet seat body 13 and the toilet seat back plate 14 is formed over the entire length of the toilet seat 10, and the space 58 is formed so as to enhance the heat insulating property of the toilet seat 10. The toilet seat body 13 and the toilet seat back plate 14 are formed using an appropriate resin such as ABS resin (acrylonitrile, butadiene, styrene copolymer resin) and polypropylene resin.
[0014]
The toilet seat main body 13 has a main body opening 30 constituting the toilet seat opening 11 at a substantially central portion and is formed in a substantially donut shape in a plan view, and as shown in FIG. The contact portion 20, the inner peripheral piece 21 formed so as to surround the main body opening 30, and the outer peripheral piece 22 constituting the outer periphery of the toilet seat 10 are formed in a substantially U-shaped cross section. The inner peripheral piece 21 is provided with an inner notch 23 that opens to the back side over the entire circumference, and the outer peripheral piece 22 is provided with an outer notch 24 that opens to the back side over the entire circumference. ing. The inner cutout portion 23 is formed by being sandwiched between the inner insertion piece 25 and the inner peripheral piece 26, and the outer cutout portion 24 is formed by being sandwiched between the outer insertion piece 45 and the outer peripheral piece 46. On the back surface of the circumferential piece 26 and the back surface of the outer circumferential piece 46, the projections 5 as shown in FIG. 1 are formed on the opening edges of the inner cutout portion 23 and the outer cutout portion 24. It is provided over the entire length. The tip of the projection 5 is formed at an acute angle.
[0015]
The toilet seat back plate 14 has a back plate opening 32 constituting the toilet seat opening 11 in a substantially central portion and is formed in a substantially donut shape corresponding to the toilet seat body 13 in a plan view, as shown in FIG. Thus, the toilet side surface of the toilet seat 10 is configured. An inner reinforcing portion 34 is provided over the entire length of the toilet seat back plate 14 at the inner end of the toilet seat back plate 14 (the end on the back plate opening 32 side), and the inner reinforcing portion 34 has a back plate opening. An inner locking piece 35 having a substantially L-shaped cross section protruding toward the 32 side is provided over the entire length of the inner reinforcing portion 34. Further, as shown in FIG. 1, a protrusion 5 is provided on the back surface of the inner locking piece 35 so as to protrude over the entire length of the inner locking piece 35. Further, an outer reinforcing portion 36 is provided over the entire length of the toilet seat back plate 14 at the outer end of the toilet seat back plate 14 (end on the outer peripheral side of the toilet seat 10). A substantially L-shaped outer locking piece 37 protrudes over the entire length of the outer reinforcing portion 36. Further, as shown in FIG. 1, the protruding portion 5 is provided on the back surface of the outer locking piece 37 so as to protrude over the entire length of the outer locking piece 37. The tip of the projection 5 is formed at an acute angle.
[0016]
When the toilet seat body 13 and the toilet seat back plate 14 are joined, the mold 6 including the upper mold 40 and the lower mold 41 is used. The upper mold 40 is provided with a back plate storage portion 42 that is open on the lower surface thereof, and the back plate storage portion 42 is formed in a shape into which the toilet seat back plate 14 can be fitted. The upper die 40 is formed with a plurality of supply portions 43 that open to the upper surface and the back plate storage portion 42, and the opening of the supply portion 43 on the back plate storage portion 42 side is formed as an introduction port 44. Further, the lower mold 41 has a main body storage portion 45 opened on the upper surface thereof, and the main body storage portion 45 is formed in a shape into which the toilet seat main body 13 can be fitted.
[0017]
The toilet seat body 13 and the toilet seat back plate 14 are joined as follows. First, as shown in FIG. 7, the toilet seat body 13 and the toilet seat back plate 14 are arranged to face each other, and the inner locking piece 35 is inserted into the inner notch 23 and the inner locking piece 35 and the inner reinforcing portion 34 are placed inside. By inserting the insertion piece 25, inserting the outer locking piece 37 into the outer notch 24, and inserting the outer insertion piece 45 between the outer locking piece 37 and the outer reinforcing portion 36, The toilet seat body 13 and the toilet seat back plate 14 are combined by locking the insertion piece 25 and locking the outer engagement piece 37 and the outer insertion piece 45. By combining the toilet seat body 13 and the toilet seat back plate 14 in this way, as shown in FIG. 1A, an inner notch 23 and an inner locking piece are formed at the joint 2 of the toilet seat body 13 and the toilet seat back plate 14. An inner passage 3 a made up of 35 and an outer passage 3 b made up of the outer notch 24 and the outer locking piece 37 are formed as the passage 3. Further, the protrusion 5 at the edge of the inner passage 3a is positioned so as to be inclined toward the inner passage 3a and protrude toward the rear surface side, and the protrusion 5 at the edge of the outer passage 3b is inclined toward the outer passage 3b side. Located so as to protrude.
[0018]
Next, a combination of the toilet seat body 13 and the toilet seat back plate 14 is set between the upper mold 40 and the lower mold 41 as shown in FIG. At this time, the toilet seat body 13 is stored in the main body storage portion 45 of the lower mold 41 and the toilet seat back plate 14 is stored in the back plate storage portion 42 of the upper mold 40. Further, by clamping the upper mold 40 and the lower mold 41, as shown in FIG. 1 (b), the protrusion 5 is pressed by the back plate housing portion 42 and falls into the inner passage 3a and the outer passage 3b. . The angle formed between the contact surface of the mold 6 (upper mold 40) and the side of the passage 3 in the projecting part 5 that has fallen, that is, the angle α of the tip of the projecting part 5 that has fallen is formed at an acute angle. Furthermore, the introduction port 44 is located corresponding to the opening of the inner passage 3a and the opening of the outer passage 3b. The introduction port 44 is preferably formed at a position where the bonding resin 4 can flow into the inner passage 3a and the outer passage 3b with substantially the same length. Specifically, the introduction port 44 is formed at the inner passage 3a or the outer passage. It is preferable to position it at regular intervals along 3b.
[0019]
Next, the joining resin 4 is injected into the inner passage 3a and the outer passage 3b through the supply portion 43 and the introduction port 44 by injection molding or the like, and the inner passage 3a and the outer passage 3b are joined as shown in FIG. The resin 4 is filled so as to be completely filled. At this time, since the protrusions 5 are provided at the opening edges of the inner passage 3a and the outer passage 3b, the bonding resin 4 does not protrude from the inner passage 3a and the outer passage 3b (does not leak out). ) As the bonding resin 4, a thermoplastic resin such as an ABS resin or a polypropylene resin can be used. The bonding resin 4 is injected and filled in a molten state. At this time, the tip of the projection 5 is melted by the action of heat of the bonding resin 4, and the tip of the projection 5 is rounded. Thereafter, the filled bonding resin 4 is cooled and cured, and the toilet seat body 13 and the toilet seat back plate 14 are firmly fixed and bonded to each other at the bonded portion 2 with the cooled and cured bonding resin 4. At this time, the protruding portion 5 having a rounded end bites into the bonding resin 4. Next, as shown in FIG. 9, the upper die 40 and the lower die 41 are opened, the integrated body of the toilet seat body 13 and the toilet seat back plate 14 is removed, and the foot member 31 is attached to the back surface of the toilet seat back plate 14. Thus, the toilet seat 10 can be formed.
[0020]
In this way, in the present invention, as shown in FIG. 6, the passage 3 formed in the joint portion 2 of the plurality of resin parts 1 is filled with the joining resin 4 and cooled and cured, and the plurality of resin parts 1 are joined. In the manufacturing method of the resin product to be bonded with the resin 4, the protrusion 5 for preventing the bonding resin 4 from protruding out of the passage 3 is provided at the opening edge of the passage 3 filled with the bonding resin 4. Therefore, the protrusion 5 serves as a sealing means so that the bonding resin 4 does not protrude from the passage 3 (does not leak). Further, since no biting projections that bite into the resin part 1 as in the conventional example are used, it is possible to keep the traces of the biting projections on the surface of the resin product and to reduce the appearance of the resin product. In addition, the resin product is not easily cracked or broken, and in addition, the mold 6 is not easily worn or damaged, and the life of the mold 6 can be extended. Further, even if the finished dimension of the resin component 1 is slightly shifted, deformed, warped, or the like, the protrusion 5 is formed almost at the opening edge of the passage 3, and the bonding resin is formed at the protrusion 5. 4 can be reliably prevented, and the appearance of the resin product can be prevented from being deteriorated and the bonding failure of the resin parts can be prevented.
[0021]
Further, since the protrusion 5 is pressed when the mold 6 is clamped and falls into the passage 3, it can be prevented from projecting to the outer surface of the resin product, and the protrusion 5 does not deteriorate the appearance of the resin product. In addition, the adhesion between the mold 6 and the resin part 1 can be increased at the protruding portion 5.
[0022]
Further, since the angle between the contact surface with the mold 6 and the passage 3 side direction in the collapsed projection 5, that is, the angle α of the tip of the collapsed projection 5 is formed at an acute angle, the cured bonding resin 4, the protruding portion 5 can be digged in, the bonding strength of the plurality of resin parts 1 can be increased, and moreover, the tip of the protruding portion 5 is formed on the outer surface of the resin product rather than forming an obtuse angle. This prevents the bonding resin 4 from sticking out.
[0023]
The size and shape of the passage 3 and the filling condition of the bonding resin 4 are set according to various resin products. For example, in the case of the toilet seat 10 as described above, the size of the passage 3 is a cross section. The depth is set to about 4 mm × width 2 mm. In addition, the flow length when filling the bonding resin 4 is set to, for example, 530 mm in the case of the passage 3 having a depth of 4 mm and a width of 2 mm under equipment conditions of a resin temperature of 280 ° C. and an injection pressure of 500 kgf / cm 2. it can. Furthermore, the number of the introduction ports 44 opening at the position corresponding to the inner passage 3a can be set to three, and the number of the introduction ports 44 opening to the position corresponding to the outer passage 3b can be set to five.
[0024]
【The invention's effect】
As described above, the invention according to claim 1 of the present invention joins a plurality of resin parts with a bonding resin by forming a passage in a joint portion of the plurality of resin parts and filling the passage with a bonding resin. In the method for manufacturing a resin product, a protrusion is provided on at least one resin part for preventing the bonding resin from protruding outside the passage, and the protrusion is inclined toward the passage toward the edge of the passage. provided to the protruding opening direction, the protruding portion Runode be filled with the adhesive resin in the passageway after the mold is pressed against was further tilt down the passage, the bonding resin protrusions become sealing means It can be prevented from protruding out of the passage, and since no biting protrusion that bites into the resin part is used, there can be no trace of the biting protrusion biting into the surface of the resin product, Reduced appearance of resin products Without so that things, yet are those cracks and breakage is unlikely to occur in the resin product, in addition, die wear and breakage hardly occurs, is capable to lengthen the mold life. Furthermore, even if there are some deviations, deformations, warping, etc. of the finished dimensions of the resin parts, the projections are almost formed at the opening edge of the passage, and the projection resin reliably protrudes from the projections. Therefore, it is possible to prevent the appearance of the resin product from being deteriorated or the joining failure of the resin parts to occur. Furthermore, the protrusion can be prevented from projecting to the outer surface of the resin product, the appearance of the resin product can be prevented from being deteriorated by the protrusion, and the adhesion between the mold and the resin part can be prevented. Can be raised at the protruding portion.
[0026]
In the invention of claim 2 of the present invention, since the tip of the protrusion is formed at an acute angle, the protrusion can be bitten into the bonding resin, and the bonding strength of a plurality of resin parts can be increased. In addition, the protrusion of the bonding resin to the outer surface of the resin product can be made less likely to occur than when the tip of the protrusion is formed at an obtuse angle.
[Brief description of the drawings]
FIGS. 1A, 1B, and 1C are partial cross-sectional views showing an example of an embodiment of the present invention.
FIG. 2 is a perspective view showing the same resin product.
3A is a cross-sectional view, and FIG. 3B is a schematic view.
FIG. 4 is a plan view of the same.
FIG. 5 is a bottom view of the same.
6 is a cross-sectional view taken along the line AA in FIG. 3 (b).
FIG. 7 is a cross-sectional view of the above.
FIG. 8 is a cross-sectional view of the above.
FIG. 9 is a cross-sectional view of the above.
FIG. 10 is a partial cross-sectional view showing a conventional example.
11A and 11B are partial cross-sectional views showing a conventional example.
12A and 12B are partial cross-sectional views showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Resin parts 2 Joint part 3 Passage 4 Joining resin 5 Protrusion part 6 Mold

Claims (2)

複数の樹脂製部品の接合部に通路を形成し、通路に接合用樹脂を充填することにより、複数の樹脂製部品を接合用樹脂で接合する樹脂製品の製造方法において、接合用樹脂が通路の外へはみ出すことを防止するための突起部を少なくとも一つの樹脂製部品に設け、前記突起部は通路の縁部に通路側に傾いて通路の開口方向に突出するように設け、前記突起部に金型を押圧させて通路に倒れ込ませた後に通路に接合用樹脂を充填することを特徴とする樹脂製品の製造方法。In a manufacturing method of a resin product in which a plurality of resin parts are joined with a joining resin by forming a passage in a joint portion of the plurality of resin parts and filling the passage with a joining resin, Protrusions are provided on at least one resin part to prevent the protrusions from protruding outside, and the protrusions are provided at the edges of the passage so as to incline toward the passage and project in the opening direction of the passage. method for producing a resin product characterized that you fill the adhesive resin to the passageway after the mold is pressed against was further tilt down the passage. 突起部の先端が鋭角に形成されていることを特徴とする請求項１に記載の樹脂製品の製造方法。The method for producing a resin product according to claim 1, wherein the tip of the protrusion is formed at an acute angle .
JP08347199A 1999-03-26 1999-03-26 Manufacturing method of resin products Expired - Fee Related JP3733778B2 (en)

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