JP3864268B2 - Horn for forming a welded part of a tube - Google Patents

Horn for forming a welded part of a tube Download PDF

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Publication number
JP3864268B2
JP3864268B2 JP15530093A JP15530093A JP3864268B2 JP 3864268 B2 JP3864268 B2 JP 3864268B2 JP 15530093 A JP15530093 A JP 15530093A JP 15530093 A JP15530093 A JP 15530093A JP 3864268 B2 JP3864268 B2 JP 3864268B2
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Prior art keywords
welded
horn
tube
welding
ultrasonic
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JPH0710130A (en
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彰 小金沢
守 藤田
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Yoshino Kogyosho Co Ltd
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Yoshino Kogyosho Co Ltd
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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
    • 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
    • B29C65/081—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations having a component of vibration not perpendicular to the welding surface
    • 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
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being non-straight, e.g. forming non-closed contours
    • B29C66/2442—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being non-straight, e.g. forming non-closed contours in the form of a single arc of circle
    • 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • B29C66/43123—Closing the ends of squeeze tubes, e.g. for toothpaste or cosmetics
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
    • 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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/723—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 structure of the material of the parts to be joined being multi-layered
    • 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
    • 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
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/951—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools
    • B29C66/9515—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools by measuring their vibration amplitude
    • 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
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/951—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools
    • B29C66/9516—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools by controlling their vibration amplitude
    • 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
    • B29L2023/00—Tubular articles
    • B29L2023/20—Flexible squeeze tubes, e.g. for cosmetics

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Package Closures (AREA)
  • Closing Of Containers (AREA)

Abstract

PURPOSE:To mold a welded part in a different shape of a tube by utilizing lateral vibration of supersonic waves thereby molding the welded part having sufficient strength. CONSTITUTION:A welded protrusion 4 having a differently shaped protruding end face is provided on a surface of a weldable area determined by amplitude width distribution characteristics (a) and amplitude vertical characteristics (b) of a tip 3 wherein the thickness is gradually decreased with respect to the body 2 of a horn, wherein lateral vibration of supersonic waves required for welding a welded part 13 of a tube 12 is securely applied to the welded protrusion 4.

Description

【０００１】
【産業上の利用分野】
本発明は、合成樹脂製チューブの底部を、超音波横振動を利用して異形に溶着シールする溶着部成形用ホーンの構造に関するものである。
【０００２】
【従来の技術】
母材がポリエチレン、ポリプロピレン等からなる単層または多層チューブ、あるいは内部にアルミニウム箔、紙シート等を設けたラミネートチューブ等の合成樹脂製チューブにおいて、内容物を充填した後、その底部を溶着シールする手段としては、従来、熱溶着、高周波溶着、ホットエアー溶着、超音波溶着（縦振動方式）等の溶着方法が知られている。
【０００３】
ところで、この種の合成樹脂製チューブにおいては、底部のシール、すなわち溶着部は、チューブ本体に対して真横直線状に溶着されるのが一般的であるが、近年、チューブ容器の多様化に伴って、図８に示すように、チューブ１２の底部に成形される溶着部１３の形状も円弧状等、真横直線状以外の形状の溶着部（本明細書では異形溶着部と云う）を採ることが多くなってきている
【０００４】
【発明が解決しようとする課題】
この異形溶着部の場合、溶着範囲がチューブの上下方向（長手方向）に長くなるため、充填時に内容物が溶着面の一部に付着し易くなるが、溶着面に内容物が付着すると、前記したいずれの溶着手段も、成形された溶着部の溶着強度が大幅に低下してしまい、充分な強度の溶着部を成形できないと云う問題があった。
【０００５】
そこで、本発明は、上記した従来技術における問題点を解消すべく創案されたもので、チューブの異形溶着部を、超音波横振動を利用して成形することを技術的課題とし、もって充分な強度の異形溶着部を成形することを目的とする。
【０００６】
【課題を解決するための手段】
上記技術的課題を解決する本発明の手段は、
超音波横振動で合成樹脂製チューブの溶着部を成形するホーンであること、
本体部に対して厚みを漸減した先端部の表面に、溶着凸部を一体に凸設して有ること、
この溶着凸部を凸設した先端部の表面は、先端部における超音波横振動の振幅幅分布特性と、振幅縦分布特性とによって決定される溶着可能領域となった表面であること、
先端部の表面に凸設された溶着凸部の突出端面形状は、チューブ本体部分に対して真横直線状以外の異形となっていること、
にある。
【０００７】
溶着凸部の突出端面には、多数の角形突起部であるナールを設けるのが良く、また溶着凸部は、溶着可能領域の振幅が略等しい部分を結んだ構成とするのが有効である。
【０００８】
【作用】
チューブの溶着部の溶着面に、超音波横振動で伝達されるエネルギーは、直接この溶着面に伝達されるので、熱溶着、高周波溶着、ホットエアー溶着等に比べて遙に大きな溶着エネルギーを伝達することができる。
【０００９】
また、超音波横振動と同じく、超音波縦振動も溶着面に直接エネルギーを伝達することのできるのであるが、超音波横振動の溶着熱が、擦れ摩擦熱を発生源としているのに対して、超音波縦振動の溶着熱は、圧縮摩擦熱を発生源としているので、同一エネルギーにより得ることのできる溶着熱は、超音波縦振動に比べて超音波横振動の方が遙に大きくなる。
【００１０】
超音波横振動の作用により、溶着部の溶着面同志は、押圧された状態で、互いに擦れる方向、すなわち溶着面に沿った方向に、相対的に振動変位することになるが、この相対的な振動変位により、溶着面に付着した内容物は、その大部分がこの溶着面から絞り出される形態で押し出され、例え微量の内容物が残留したとしても、この残留内容物は微小粒状となってしまうので、溶着部の溶着は確実に達成されることになる。
【００１１】
【実施例】
図１は、本発明の一実施例を使用して構成した超音波シール装置の基本的な構成を示すもので、電気エネルギーを高周波エネルギーに変換する超音波発振機系８からのエネルギーをコンバータ９により機械的エネルギーに変換し、共鳴体である本発明によるホーン１に伝達するように構成している。
【００１２】
チューブ１２の溶着部１３を実際に溶着するのは、ホーン１と、このホーン１に対向して配置されたアンビル１０との間に溶着部１３を一定圧力で挟圧しながら、ホーン１を超音波横振動させることにより達成するのであるが、ホーン１およびアンビル１０の溶着部１３を直接挟圧する部分には、成形しようとする溶着部１３の形状を設定する、同一形状の溶着凸部４および押圧凸部１１が凸設されている。
【００１３】
ホーン１（以下、図２ないし図４参照）は、上側に縮径した取付け部７を設けたブロック状の本体部２の下に、この本体部２の前後幅を漸減した先端部３を設け、この先端部３の先端側前後両面に溶着凸部４を一体に凸設し、全体をチタン合金等の超音波伝達効率が良く、機械強度の優れた金属体により一体成形されている。
【００１４】
先端部３に一体に凸設された溶着凸部４は、上方に湾曲した円弧状となっており、この溶着凸部４の凸設により、先端部３の先端部分には凹部が形成され、この凹部が、溶着部１３成形時に、この溶着部１３に隣接するチューブ１２部分がホーン１に不要に接触しないようにする逃げ凹部６を形成している。
【００１５】
この溶着凸部４の突出端面には、多数の角形突起部であるナール５（図５、参照）が、斜めにクロスした多数の細溝を多数刻設して設けられており、このナール５を設けることにより、ホーン１から溶着部１３に伝達される超音波エネルギーの伝達効率を高めている。
【００１６】
ところで、ホーン１に伝達された超音波は、ホーン１の先端部３に均一に伝達されるのではなく、図６に示した分布で伝達される。この先端部３における超音波の伝達分布の振幅幅分布特性ａは、中央部から両側端部にゆくに従って小さくなり、また振幅縦分布特性ｂは、先端にゆく従って大きくなる。
【００１７】
このように、先端部３における超音波の伝達分布には、一定した形態の分布特性を持っているが、この先端部３における超音波の伝達分布特性の実測例を図７に示す。
【００１８】
超音波の伝達分布特性の実測試験に使用したホーン１は、図７（ａ）に示すように、先端部３の幅が７０mm、厚みが９mmの構造を有し、この先端部３の中心線上、および中心線から左右３０mmの位置で、先端部３の先端から５mm間隔で６ケ所で、２０ＫHzで２０μの超音波を入力して、先端部３の超音波の振幅を測定した。その結果を、図７（ｂ）に示す。
【００１９】
一般に、熱可塑性合成樹脂製チューブを、超音波横振動で完全に溶着できる振幅は、通常２０ＫHzで７０μ〜１００μであるから、先端部３における溶着可能領域Ｔは、図７（ｂ）の斜線を付した部分となり、この溶着可能領域Ｔ内に溶着凸部４を設けることにより、この溶着凸部４の形状通りに異形な溶着部１３を成形することができる。
【００２０】
溶着凸部４を溶着可能領域Ｔに設けることにより、この溶着凸部４の形状通りの異形な溶着部１３を溶着成形することができるのであるが、安定して良質な溶着部１３を成形するには、溶着凸部４全域の振幅が略等しいことが望ましく、このことから溶着凸部４の形状は、先端部３の先端左右両端を下端とした図２に示す円弧状とするのが有利である。
【００２１】
【発明の効果】
本発明は、上記した構成となっているので、以下に示す効果を奏する。
ホーンの溶着凸部を、実測等で求められる溶着可能領域内に設けるので、チューブの異形溶着部の成形を確実に達成でき、また溶着凸部は溶着可能領域内であれば、その形状が限定されることがないので、自由な形状の異形溶着部の成形が可能となる。
【００２２】
溶着部の溶着は、超音波横振動により達成するので、溶着部の溶着面に内容物が付着したとしても、溶着部の溶着シールを確実に達成することができ、もって充分な強度の異形溶着部を成形することができる。
【図面の簡単な説明】
【図１】本発明によるホーンを使用する超音波シール装置の基本的な構成図。
【図２】本発明の一実施例を示す正面図。
【図３】図２に示した実施例の側面図。
【図４】図２に示した実施例の部分縦断側面図。
【図５】本発明の他の実施例を示す、溶着凸部の突出端面部分の拡大断面図。
【図６】ホーンの先端部における入力された超音波横振動の伝達分布特性の説明図。
【図７】ホーンの先端部における伝達された超音波横振動の振幅測定により得られる、溶着可能領域の実測例図。
【図８】図２の実施例で成形される異形溶着部を有するチューブの要部正面図。
【符号の説明】
１ ； ホーン
２ ； 本体部
３ ； 先端部
４ ； 溶着凸部
５ ； ナール
６ ； 逃げ凹部
７ ； 取付け部
８ ； 超音波発振機系
９ ； コンバータ
１０； アンビル
１１； 押圧凸部
１２； チューブ
１３； 溶着部
ａ ； 振幅幅分布特性
ｂ ； 振幅縦分布特性
Ｔ ； 溶着可能領域[0001]
[Industrial application fields]
The present invention relates to a structure of a welded portion forming horn in which a bottom portion of a synthetic resin tube is welded and sealed in an irregular shape using ultrasonic transverse vibration.
[0002]
[Prior art]
In a single-layer or multi-layer tube whose base material is made of polyethylene, polypropylene, etc., or a synthetic resin tube such as a laminate tube with an aluminum foil or paper sheet inside, after filling the contents, the bottom is welded and sealed Conventionally known welding methods include thermal welding, high-frequency welding, hot air welding, and ultrasonic welding (longitudinal vibration method).
[0003]
By the way, in this type of synthetic resin tube, the bottom seal, that is, the welded portion, is generally welded in a straight line shape to the tube body, but in recent years, with the diversification of tube containers. As shown in FIG. 8, the shape of the welded portion 13 formed at the bottom of the tube 12 is also a welded portion having a shape other than a straight horizontal shape such as an arc shape (referred to herein as an irregularly shaped welded portion). Is increasing [0004]
[Problems to be solved by the invention]
In the case of this deformed welded portion, the welding range becomes longer in the vertical direction (longitudinal direction) of the tube, so that the content easily adheres to a part of the welded surface during filling, but when the content adheres to the welded surface, Each of the welding means has a problem that the weld strength of the formed welded portion is greatly reduced, and a welded portion having sufficient strength cannot be formed.
[0005]
Therefore, the present invention was devised to solve the above-described problems in the prior art, and it is a technical problem to form a deformed welded portion of a tube by utilizing ultrasonic transverse vibration. The object is to form a strong deformed weld.
[0006]
[Means for Solving the Problems]
The means of the present invention for solving the above technical problem is:
It is a horn that forms a welded part of a synthetic resin tube by ultrasonic transverse vibration.
The welding convex part is integrally projected on the surface of the tip part whose thickness is gradually reduced with respect to the main body part,
The surface of the tip portion provided with the welding convex portion is a surface that has become a weldable region determined by the amplitude width distribution characteristic of the ultrasonic transverse vibration and the amplitude vertical distribution characteristic at the tip portion,
The protruding end surface shape of the welding convex portion provided on the surface of the tip portion is an irregular shape other than a straight horizontal shape with respect to the tube main body portion,
It is in.
[0007]
It is preferable to provide knurls which are a large number of square protrusions on the protruding end face of the welding convex portion, and it is effective that the welding convex portion has a configuration in which portions having substantially the same amplitude of the weldable region are connected.
[0008]
[Action]
The energy transmitted by ultrasonic transverse vibration to the welding surface of the welded part of the tube is directly transmitted to this welding surface, so that a larger welding energy is transmitted compared to heat welding, high frequency welding, hot air welding, etc. can do.
[0009]
Like ultrasonic transverse vibration, ultrasonic longitudinal vibration can also transmit energy directly to the welding surface, whereas the welding heat of ultrasonic transverse vibration is caused by frictional frictional heat. Since the welding heat of the ultrasonic longitudinal vibration is generated from the compression frictional heat, the welding heat that can be obtained with the same energy is much larger in the ultrasonic transverse vibration than in the ultrasonic longitudinal vibration.
[0010]
Due to the action of the ultrasonic transverse vibration, the welding surfaces of the welded portion are relatively displaced in the pressed state in the direction of rubbing with each other, that is, the direction along the welded surface. Due to the vibration displacement, the content adhering to the welding surface is mostly pushed out in a form that is squeezed out of the welding surface, and even if a small amount of content remains, the residual content becomes finely granular. Therefore, the welding of the welded portion is surely achieved.
[0011]
【Example】
FIG. 1 shows a basic configuration of an ultrasonic sealing apparatus configured by using an embodiment of the present invention. Energy from an ultrasonic oscillator system 8 that converts electrical energy into high-frequency energy is converted into a converter 9. Is converted into mechanical energy and transmitted to the horn 1 according to the present invention which is a resonator.
[0012]
The welded portion 13 of the tube 12 is actually welded by ultrasonically pressing the horn 1 while holding the welded portion 13 at a constant pressure between the horn 1 and the anvil 10 disposed facing the horn 1. This is achieved by lateral vibration, but the weld convex portion 4 and the pressing portion having the same shape are set in the portion where the weld portion 13 of the horn 1 and the anvil 10 is directly clamped, and the shape of the weld portion 13 to be molded is set. The convex part 11 is provided in a protruding manner.
[0013]
The horn 1 (refer to FIG. 2 to FIG. 4 below) is provided with a tip 3 having a gradually reduced front-and-rear width of the main body 2 under the block-shaped main body 2 provided with a mounting portion 7 whose diameter is reduced on the upper side. The welding projections 4 are integrally formed on both front and rear surfaces of the tip portion 3, and the whole is integrally formed of a metal body having good ultrasonic transmission efficiency such as titanium alloy and having excellent mechanical strength.
[0014]
The welding convex part 4 integrally projected on the tip part 3 has an arc shape that is curved upward, and the convex part of the welding convex part 4 forms a concave part at the tip part of the tip part 3, The recess forms a relief recess 6 that prevents the tube 12 adjacent to the weld 13 from unnecessarily contacting the horn 1 when the weld 13 is formed.
[0015]
On the projecting end face of the welding projection 4, a plurality of knurls 5 (see FIG. 5), which are square projections, are provided by engraving a large number of obliquely crossed narrow grooves. By providing this, the transmission efficiency of the ultrasonic energy transmitted from the horn 1 to the welding part 13 is improved.
[0016]
By the way, the ultrasonic wave transmitted to the horn 1 is not uniformly transmitted to the tip 3 of the horn 1 but is transmitted with the distribution shown in FIG. The amplitude width distribution characteristic a of the ultrasonic transmission distribution at the tip 3 decreases as it goes from the center to both ends, and the amplitude vertical distribution characteristic b increases as it approaches the tip.
[0017]
As described above, the ultrasonic transmission distribution at the distal end portion 3 has a constant distribution characteristic. FIG. 7 shows an actual measurement example of the ultrasonic transmission distribution characteristic at the distal end portion 3.
[0018]
As shown in FIG. 7A, the horn 1 used for the actual measurement test of the ultrasonic transmission distribution characteristic has a structure in which the tip 3 has a width of 70 mm and a thickness of 9 mm. The ultrasonic amplitude of the tip portion 3 was measured by inputting 20 μ ultrasonic waves at 20 KHz at six locations at 5 mm intervals from the tip of the tip portion 3 at a position 30 mm to the left and right of the center line. The result is shown in FIG.
[0019]
In general, the amplitude at which a thermoplastic synthetic resin tube can be completely welded by ultrasonic transverse vibration is usually 70 μ to 100 μ at 20 KHz. Therefore, the weldable region T at the tip 3 is indicated by the oblique line in FIG. By providing the welding convex portion 4 in the weldable region T, the welded portion 13 having a deformed shape can be formed according to the shape of the welding convex portion 4.
[0020]
By providing the welding convex portion 4 in the weldable region T, it is possible to weld-mold the irregularly shaped welded portion 13 as the shape of the weld convex portion 4, but stably form a good quality welded portion 13. In addition, it is desirable that the amplitude of the entire area of the welding convex portion 4 is substantially equal. Therefore, the shape of the welding convex portion 4 is preferably an arc shape shown in FIG. It is.
[0021]
【The invention's effect】
Since the present invention has the above-described configuration, the following effects can be obtained.
Since the horn welding convex part is provided in the weldable area required by actual measurement, etc., it is possible to reliably achieve the forming of the irregularly shaped welded part of the tube, and if the welding convex part is in the weldable area, the shape is limited. Therefore, it is possible to form a deformed welded portion having a free shape.
[0022]
Since welding of the welded part is achieved by ultrasonic vibration, even if the contents adhere to the welded surface of the welded part, it is possible to reliably achieve the welded seal of the welded part, so that the deformed weld with sufficient strength can be achieved. The part can be molded.
[Brief description of the drawings]
FIG. 1 is a basic configuration diagram of an ultrasonic sealing device using a horn according to the present invention.
FIG. 2 is a front view showing an embodiment of the present invention.
FIG. 3 is a side view of the embodiment shown in FIG. 2;
4 is a partial longitudinal side view of the embodiment shown in FIG. 2; FIG.
FIG. 5 is an enlarged cross-sectional view of a protruding end surface portion of a welding convex portion showing another embodiment of the present invention.
FIG. 6 is an explanatory diagram of the transmission distribution characteristics of the input ultrasonic transverse vibration at the tip of the horn.
FIG. 7 is an actual measurement example of a weldable region obtained by measuring the amplitude of the transmitted ultrasonic transverse vibration at the tip of the horn.
8 is a front view of an essential part of a tube having a deformed weld portion formed in the embodiment of FIG. 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1; Horn 2; Main-body part 3; Tip part 4; Welding convex part 5; Naru 6; Escape recessed part 7; Mounting part 8; Ultrasonic oscillator system 9; Converter 10; Anvil 11; Welding part a; Amplitude width distribution characteristic b; Amplitude longitudinal distribution characteristic T; Weldable region

Claims (3)

超音波横振動で合成樹脂製チューブ(12)の溶着部(13)を成形するホーン(1) であって、本体部(2) に対して厚みを漸減した先端部(3) の、該先端部(3) における超音波横振動の振幅幅分布特性(a) と、振幅縦分布特性(b) とによって決定される溶着可能領域(T) 表面に、真横直線状以外の異形な突出端面形状となった溶着凸部(4) を一体に凸設したチューブの異形溶着部成形用ホーン。A horn (1) for forming a welded part (13) of a synthetic resin tube (12) by ultrasonic transverse vibration, the tip part (3) having a thickness gradually reduced with respect to the main body part (2). The weldable area (T) determined by the amplitude width distribution characteristic (a) and the longitudinal amplitude distribution characteristic (b) of the ultrasonic transverse vibration in the part (3). A tube-shaped welded part forming horn having a convexly formed welded convex part (4) integrally formed. 溶着凸部(4) の突出端面に、多数の角形突起部であるナール(5) を設けた請求項１に記載のチューブの異形溶着部成形用ホーン。The deformed welded portion forming horn for a tube according to claim 1, wherein a plurality of square protrusions (5) are provided on the projecting end face of the welded convex portion (4). 溶着凸部(4) を、溶着可能領域(T) の振幅が略等しい部分を結んで構成した請求項１または２に記載のチューブの異形溶着部成形用ホーン。The horn for forming a deformed weld portion of a tube according to claim 1 or 2, wherein the weld convex portion (4) is formed by connecting portions having substantially equal amplitudes of the weldable region (T).
JP15530093A 1993-06-25 1993-06-25 Horn for forming a welded part of a tube Expired - Lifetime JP3864268B2 (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
JP15530093A JP3864268B2 (en) 1993-06-25 1993-06-25 Horn for forming a welded part of a tube

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Publication number Priority date Publication date Assignee Title
FR2820679B1 (en) * 2001-02-15 2003-10-31 Kalix Sa PROCESS FOR PRODUCING, BY WELDING, THE BOTTOM OF PLASTIC TUBES, DEVICE FOR IMPLEMENTING SAME AND TUBE OBTAINED
US9487317B2 (en) 2010-10-26 2016-11-08 Rinco Ultrasonics USA, Inc. Sonotrode and anvil energy director grids for narrow/complex ultrasonic welds of improved durability
US9272802B2 (en) 2010-10-26 2016-03-01 Rinco Ultrasonics USA, Inc. Stepped sonotrode and anvil energy director grids for narrow/complex ultrasonic welds of improved durability
US9278481B2 (en) 2010-10-26 2016-03-08 Rinco Ultrasononics USA, INC. Sonotrode and anvil energy director grids for narrow/complex ultrasonic welds of improved durability
US9352868B2 (en) 2010-10-26 2016-05-31 Rinco Ultrasonics USA, Inc. Stepped sonotrode and anvil energy director grids for narrow/complex ultrasonic welds of improved durability
US8376016B2 (en) * 2010-10-26 2013-02-19 Rinco Ultrasonics Usa Inc. Sonotrode and anvil energy director grids for narrow/complex ultrasonic welds of improved durability
DE102010043089A1 (en) 2010-10-29 2012-05-03 Robert Bosch Gmbh Sealing jaw for sealing a packaging material by means of ultrasound
JP6207316B2 (en) * 2013-09-19 2017-10-04 共同印刷株式会社 Tube laminate and tube container
US9873534B2 (en) 2014-12-19 2018-01-23 Branson Ultrasonics Corporation Tooling for ultrasonic tube sealer for sealing an end portion of a tube to have a rounded configuration
US10023362B2 (en) 2016-03-15 2018-07-17 Amg Co., Ltd. Tube cosmetic container

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