JP2847407B2 - 液晶ポリマーの超音波溶着方法 - Google Patents

液晶ポリマーの超音波溶着方法

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Publication number
JP2847407B2
JP2847407B2 JP32670789A JP32670789A JP2847407B2 JP 2847407 B2 JP2847407 B2 JP 2847407B2 JP 32670789 A JP32670789 A JP 32670789A JP 32670789 A JP32670789 A JP 32670789A JP 2847407 B2 JP2847407 B2 JP 2847407B2
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Prior art keywords
welded
ultrasonic welding
melting point
liquid crystal
preheating
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JPH03184830A (ja
Inventor
一利 岡田
力雄 黒田
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日本石油化学株式会社
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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
    • 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
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024—Thermal pre-treatments
    • B29C66/0242—Heating, or preheating, e.g. drying
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • B29C66/91643—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile
    • B29C66/91645—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile by steps
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
    • B29C66/91921—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
    • B29C66/91931—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined
    • B29C66/91935—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined lower than said fusion temperature
    • 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Plasma & Fusion (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は液晶ポリマーの超音波溶着方法に関するもの
である。更に詳しくは、本発明は250℃以上の融点を有
する液晶ポリマー同士あるいは上記液晶ポリマーと250
℃未満の融点を有する他の樹脂（これらを以下に「被溶
着材」という）を超音波溶着により確実に接合する方法
に関するものである。
［従来の技術］ 超音波溶着は、ポリエチレン、ポリプロピレン、ポリ
スチレン、AS、ABS、ポリカーボネート、ナイロン、ポ
リエステル、ポリスルホン、ポリアセタール、アクリロ
ニトリル、ポリフェニレンオキサイド、アセテート、塩
化ビニル等の樹脂の接合、接着およびシールなどに広く
利用されている。また、樹脂へ金属インサートを埋め込
む場合など、樹脂と他の材質のものとの接合にも広範囲
に利用されている。
この超音波溶着を確実にするために、接合面の形状や
被溶着材の受け台、あるいは超音波を与えるホーンの形
状などについて種々の工夫がなされている。一方、被溶
着材が相手材と溶着されるためには材料を溶融させる必
要がある。その場合、樹脂の融点が低いときには、ごく
短時間の振動で目的を達成することができるので非常に
有効であるが、樹脂材料の融点が高くなるに従って超音
波振動を与える時間が長くなり、更に被溶着材の移動を
抑制するために圧力を高くする必要がある。
そのために、樹脂の変形や破損、あるいはその他の欠
陥が生じるようになる。欠陥が生じる傾向は薄肉の部品
になるほど著しい。また、振動時間が長くなると、既に
組み込まれている部品の緩みも起こるようになり好まし
くない。
［発明が解決しようとする課題］ 液晶ポリマーの接合における破損等の原因を検討した
結果、破損等の欠陥の多くは、振動開始の初期、すなわ
ち樹脂の強度は高いが伸びに対する許容性がなく、衝撃
に弱い時期に起こることが分かった。また、樹脂を所定
の温度範囲内で予熱した後に本来の溶着を行なうことに
より、振動時間が短くなると共に樹脂成形品の破損を防
止できることを見出した。
［課題を解決するための手段］ 本発明は、250℃以上の融点を有する液晶ポリマー同
士あるいは上記液晶ポリマーと250℃未満の融点を有す
る他の樹脂からなる被溶着材、すなわち少なくとも１つ
の被溶着材が融点250℃以上の液晶ポリマーからなる合
成樹脂製被溶着材を超音波溶着により接合する方法にお
いて、50℃から前記被溶着材の融点の内、低い方の融点
よりも更に10℃低い温度の範囲において、前記被溶着材
の少なくとも１つを予熱した後に、超音波溶着を行なう
ことを特徴とする超音波溶着方法に関するものである。
応力に対する伸びが小さい液晶ポリマーにおいては、
エネルギー集中部の破損や欠陥が生じ、正常な製品が得
られなくなるおそれがあるが、本発明の方法、すなわち
樹脂を予め加熱することにより、応力に対する伸びは大
きくなるので、良好な超音波溶着が可能となる。
本発明において250℃未満の融点を有する樹脂（以下
「他の樹脂」という）とは以下のような例がある。すな
わち、ポリエチレン、ポリプロピレン、ポリスチレン、
アクリロニトリル・スチレン共重合体（AS）、アクリロ
ニトリル・ブタジエン・スチレン共重合体（ABS）、ポ
リカーボネート、ナイロン、ポリエステル、ポリスルホ
ン、ポリアセタール、アクリロニトリル、ポリフェニレ
ンオキサイド、アセテート、塩化ビニル樹脂などであ
る。
本発明における予熱の温度は、超音波溶着用の被溶着
材の融点に従って適宜に定める。すなわち、50℃を下限
とし、被溶着材の融点の内、低い方の融点よりも更に10
℃低い温度を上限とする温度範囲に被溶着材を予熱して
おくことが好ましい。特に好ましくは、50℃を下限と
し、かつ被溶着材の融点の内、低い方の融点よりも更に
50℃低い温度を上限とする温度範囲に予熱する。
すなわち、予熱温度は何れの被溶着材も溶融されない
温度の範囲である。被溶着材を50℃より低い温度で予熱
して超音波溶着をおこなう場合には、振動に要する時間
が長くなり好ましくない。また、低融点樹脂の融点より
10℃低い温度以上に予熱すると、低融点樹脂の軟化変形
が起こるおそれがあり、その場合も好ましくない。
予熱方法には特に制限はなく、外部加熱、内部加熱の
何れでもよい。外部加熱の方法としては、例えば、エア
ーオーブン、恒温槽、滅菌器、マッフル炉のような加熱
器による方法、被溶着材の受け台をヒーターや熱媒体で
加熱しておく方法などがある。また、内部加熱の方法と
しては、被溶着材を超音波溶着機で短時間加熱してから
本溶着する方法や電磁波等で予熱する方法などの何れの
場合でも満足な結果が得られる。
また、被溶着材の受け台を予熱しておいてもよい。受
け台を予熱することにより、被溶着材を予熱し、上記の
本発明の予熱範囲に達した時に超音波溶着を行なうこと
によって、本発明の目的を達成することができる。ここ
で受け台としては、被溶着材を受けて固定しあるいは保
持し、更に加熱するためのものであり、その形状は被溶
着材の形状、接合部の形状、あるいはその他の条件に応
じて適宜に作製したものを用いることができる。また、
受け台の材料としては公知のものを用いればよく、例え
ば、アルミニウム、ジュラルミン、ステンレス鋼製の受
け台などが好ましい。
第１図は本発明に用いる受け台の例を示す。受け台１
には被溶着材挿入部２の他、加熱のためのヒーターの挿
入部３、被溶着材の温度を測定するための熱電対の挿入
部４を設ける。このような受け台１に、それぞれ被溶着
材、熱電対および適宜のヒーターを挿入し、被溶着材を
本発明の予熱温度まで予熱し、その後超音波溶着を行な
う。
なお、以上に説明した本発明の方法において、通常被
溶着材全体を加熱する方法がとられる。多くの場合は被
溶着材全体を加熱することにより本発明の目的を達成す
ることができるが、例えば、弾性率が温度変化により極
端に変わる材料の場合には、接合部へ超音波の振動が充
分伝わらなかったり、接合部以外の部分が緩んだりする
ことがある。
その場合の原因を調べた結果、弾性率の温度変化率が
大きい樹脂の場合は、超音波振動の減衰が大きいため
に、接合部が溶融温度に達するまでに溶着機と接合部の
間の樹脂の温度も上昇するためであることが明らかにな
った。その場合には、接合部付近のみの温度を高くし
て、他の部分は比較的低い温度に保持しておく方法をと
る。
被溶着材の接合部のみを予熱しておく方法としては、
そのために特定の形状にし、あるいは特定の位置に設置
した加熱器を使用し、または超音波もしくは電磁波誘導
による加熱などを行なう。
上記の方法に使用する加熱器としては、特に制限はな
く、公知のものでよいが、例えば、接合部の形状に合せ
たリングヒーターなどが好ましい。また、超音波または
電磁波誘導による加熱方法の好ましい例としては、アル
ミニウム等の金属製の針金を接合部に取り付け、誘導加
熱する方法が挙げられる。
［実施例］ 以下、実施例により、この発明を具体的に説明する。
比較例 第２図に示すような直径10mm、肉厚0.5mmの液晶ポリ
エステル（商品名：ザイダー、米国アモコパーフォーマ
ンスプロダクツ社製）のガラス繊維40wt％入りグレード
（融点約400℃）の円筒容器５の同一物２個を１組とし
第３図に示すように接合した。接合の方法としては、室
温のままで1.0秒発振させ、超音波溶着を行なった。そ
の結果、30個の溶着物の内12個は円筒部が破損し、残り
の容器は部分的に溶着されたのみであった。
実施例１ 比較例で用いたものと同様な液晶ポリエステル製の円
筒容器をそれぞれ２個用いて200℃に加熱した受け台に
入れて予熱を行ない、その後0.3秒発振させて超音波溶
着を行なった。その結果、全ての溶着物について90℃の
水中で洩れが認められないシールが得られた。
実施例２ 比較例で用いたものと同様な液晶ポリエステル製の円
筒容器を、室温で超音波溶着機により0.3秒発振させて1
80℃まで予熱し、下部と上部の円筒を上下に入れ換えて
0.5秒発振させて超音波溶着を行なった。その結果30個
の溶着物の全てについて90℃の水中で洩れが認められな
いシールが得られた。
実施例３ 実施例１で用いたものと同様な液晶ポリエステル製の
円筒容器をそれぞれ２個組み合せ、リングヒーターで21
0℃に予熱し、その後0.3秒発振させて超音波溶着を行な
った。その結果、30個の溶着物の全てについて90℃の水
中で洩れが認められないシールが得られた。
実施例４ 実施例１で用いたものと同様な液晶ポリエステル製の
円筒容器の接合部にアルミニウム製の針金を置き、2.5W
の誘導加熱機により0.3秒発熱させて200℃まで予熱した
後、針金を取り除き、２秒後に室温で超音波溶着機によ
り0.3秒発振させた。その結果、30個の溶着物全てにつ
いて90℃の水中で洩れが認められないシールが得られ
た。
［発明の効果］ 本発明の方法を実施することにより、以下のような効
果をもたらすことができる。
すなわち、液晶ポリマー同士あるいは液晶ポリマーと
それよりも融点の低い他の樹脂からなる被溶着材を超音
波溶着により接合する方法において、受け台を予熱し、
あるいは適宜の方法により被溶着材を予熱することによ
って、極めて効果的に超音波溶着を行なうことができ
る。
しかも、被溶着材を損傷することなく、短時間で容易
かつ確実に超音波溶着を行なうことが可能である。
【図面の簡単な説明】
第１図は、本発明に用いる受け台の一例を示す縦断斜視
図、第２図は、本発明の実施例において超音波溶着に用
いた容器の縦断面図、および第３図は第２図に示す容器
を超音波溶着により接合した溶着物の縦断面図である。 １……受け台、２……被溶着材挿入部 ３……ヒーター挿入部、４……熱電対挿入部 ５……円筒容器

Claims (5)

    (57)【特許請求の範囲】
  1. 【請求項１】少なくとも１つの被溶着材が融点250℃以
    上の液晶ポリマーからなる合成樹脂製被溶着材を超音波
    溶着により接合する方法において、50℃から前記被溶着
    材の融点の内、低い方の融点よりも更に10℃低い温度の
    範囲において、前記被溶着材の少なくとも１つを予熱し
    た後に、溶着操作を行なうことを特徴とする超音波溶着
    方法。
  2. 【請求項２】前記被溶着材の受け台を加熱することによ
    って、該被溶着材を予熱することを特徴とする請求項１
    記載の超音波溶着方法。
  3. 【請求項３】前記被溶着材の接合部のみを予熱しておく
    ことを特徴とする請求項１記載の超音波溶着方法。
  4. 【請求項４】前記予熱に加熱器を用いることを特徴とす
    る請求項１ないし３のいずれかに記載の超音波溶着方
    法。
  5. 【請求項５】前記予熱に超音波または電磁波による誘導
    加熱を用いることを特徴とする請求項１ないし３のいず
    れかに記載の超音波溶着方法。
JP32670789A 1989-12-15 1989-12-15 液晶ポリマーの超音波溶着方法 Expired - Lifetime JP2847407B2 (ja)

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JPH03184830A JPH03184830A (ja) 1991-08-12
JP2847407B2 true JP2847407B2 (ja) 1999-01-20

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4816013B2 (ja) * 2005-11-10 2011-11-16 東レ株式会社 液晶性樹脂組成物からなる接合成形品、液晶性樹脂成形品の処理方法および接合方法
JP5802399B2 (ja) * 2010-03-30 2015-10-28 住友化学株式会社 金属樹脂複合体の製造方法
JP7016083B2 (ja) * 2017-03-29 2022-02-04 株式会社トヨタカスタマイジング＆ディベロップメント 接合システム及び接合方法
US20220243844A1 (en) * 2019-07-17 2022-08-04 Sumitomo Chemical Company, Limited Method for manufacturing welded molding, welded molding, and pipe
JP7377779B2 (ja) * 2020-08-12 2023-11-10 ニチコン株式会社 ヒータユニット、およびその製造方法

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