JP4135334B2 - Container sealing method - Google Patents

Container sealing method Download PDF

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Publication number
JP4135334B2
JP4135334B2 JP2001127157A JP2001127157A JP4135334B2 JP 4135334 B2 JP4135334 B2 JP 4135334B2 JP 2001127157 A JP2001127157 A JP 2001127157A JP 2001127157 A JP2001127157 A JP 2001127157A JP 4135334 B2 JP4135334 B2 JP 4135334B2
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Japan
Prior art keywords
sealing
heat
container
seal
convex portion
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Expired - Lifetime
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JP2001127157A
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Japanese (ja)
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JP2002321284A (en
Inventor
博昭 兼弘
充 平向
靖 波多野
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Toyo Seikan Kaisha Ltd
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Toyo Seikan Kaisha Ltd
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Priority to JP2001127157A priority Critical patent/JP4135334B2/en
Publication of JP2002321284A publication Critical patent/JP2002321284A/en
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Publication of JP4135334B2 publication Critical patent/JP4135334B2/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
    • 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
    • B29C66/81427—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 comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/76—Making non-permanent or releasable 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
    • B29C66/10—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
    • 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
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • 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
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • B29C66/242—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 closed, i.e. forming closed contours
    • 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
    • B29C66/242—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 closed, i.e. forming closed contours
    • B29C66/2424—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 closed, i.e. forming closed contours being a closed polygonal chain
    • B29C66/24243—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 closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral
    • B29C66/24244—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 closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral forming a rectangle
    • 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
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • 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
    • B29C66/7234—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 comprising a barrier layer
    • B29C66/72343—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 comprising a barrier layer for liquids
    • 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
    • B29C66/81411—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
    • 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
    • B29C66/81411—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81425—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being stepped, e.g. comprising a shoulder
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closing Of Containers (AREA)
  • Package Closures (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は、容器のシール方法に関し、食品や飲料などが入れられた容器本体に蓋材をヒートシールする場合の密封性と易開封性に優れ、特に高速でシールする場合に好適なものである。
【０００２】
【従来の技術】
従来から、食品や飲料などを収納する容器としてプラスチック製や発泡プラスチック製などのカップ状やトレー状の容器が用いられており、食品などを容器本体に充填した後、開口部上端のフランジ部にフィルム状などの蓋材を被せ、密封するため加熱しながら加圧してヒートシールする方法が広く採用されている。
【０００３】
このような食品や飲料などを収納する容器では、内容物の保存性を高めるため十分な密封性が必要とされる一方、内容物を取り出すために蓋材を容易に開封できる易開封性が必要とされる。
【０００４】
このような容器の蓋材のヒートシールに関しては、従来から種々の提案がなされており、大きく分けて２段階に別けてヒートシールするものと、１回で異なる形状のヒートシール部を形成してヒートシールするものがある。
【０００５】
前者の２段階でヒートシールするものとして、例えば▲１▼特開昭５７−１５３８０６号公報では、第１段階で容器本体のフランジ全面と蓋材とを軽く溶着しておき、第２段階で軽く溶着された面に幅の狭いリング状の強い溶着を行うようにしている。
【０００６】
また、▲２▼特開昭６３−５号公報では、第１段階で接合面のうち内周縁部のみを加熱接合し、第２段階で接合面の全面を外周縁部が最大で内周縁部に向かって加圧力が小さくなるようにして加熱接合するようにしている。
【０００７】
さらに、▲３▼特開平２−１０９８３５号公報では、第１段階で上下のシールヘッドの少なくとも一方を凸状として線接触させるようにしたものでヒートシールし、第２段階で上下が平坦なシールヘッドでヒートシールするようにしている。
【０００８】
また、▲４▼特開２０００−８５７０８号公報では、第１段階で格子状の凹部が設けられたシールヘッドでヒートシールし、第２段階でリング状の凸部が設けられたシールヘッドでヒートシールするようにしている。
【０００９】
後者の１回の異なる形状のヒートシール部でヒートシールするものとして、例えば▲１▼特開平３−６６６号公報では、接合面の外側および内側環状部を連続した凹凸状にヒートシールし、中間部を平坦にヒートシールするようにしている。
【００１０】
また、▲２▼特開平７−１７５６８号公報では、接合面の外側から内側に向かって平坦シール、櫛の歯形シール、網形シールを形成してヒートシールするようにしている。
【００１１】
さらに、▲３▼特開昭６３−２８１９０８号公報では、上下のシールヘッドのうち、上シールヘッドに内外２重の環状突条を形成し、内側の突条を外側よりも下方に位置するようにしてヒートシールするようにしている。
【００１２】
これらのヒートシール法によれば、通常、１回のヒートシールに要する時間を１秒以上、場合によっては２秒以上とし、狭い幅で強く押さえた凸状ヒートシール部で確実な密封性を得る一方、接合面全体を軽く押さえたり、格子状の凹凸などの面状ヒートシール部で蓋材の外周縁部のめくり上がりを押さえるとともに、蓋材の易開封性を確保するようにしている。
【００１３】
【発明が解決しようとする課題】
ところが、食品や飲料などを容器に充填する場合の生産性の向上のため生産ラインの高速化が図られつつあり、これまでのように１秒以上の停止時間を採ってヒートシールすることが出来ず、これまでのいずれのヒートシール方法でも短時間、例えば０．４５秒程度では、蓋材の易開封性を確保できても、十分かつ確実な密封性を得ることができないという問題がある。
【００１４】
この発明はかかる従来技術の有する課題を解決するためになされたもので、短時間に十分かつ確実な密封性を得ることができ、しかも内容物の取り出しに必要な易開封性を確保することができるとともに、蓋材のめくり上がりを押さえることもできる容器のシール方法を提供しようとするものである。
【００１５】
【課題を解決するための手段】
本願発明者らが容器のヒートシール方法について鋭意検討を重ねた結果、短時間であっても少なくとも２回同一部分をヒートシールすることでトータルのシール時間を確保するようにし、狭い幅の凸状のシール部を少なくとも２回重ねてヒートシールして密封性を確保するようにし、少なくとも２回のうち１回のヒートシールの際に凸状のシール部の内外周縁部を凹凸状のシール部で蓋材の全面を押さえるようにヒートシールすれば易開封性を確保できることを見出だし、この発明を完成したものである。
【００１６】
すなわち、上記従来技術が有する課題を解決するため、この発明の請求項１記載の容器のシール方法は、容器本体の環状のフランジ部に蓋材を加熱接合してシールする容器のシール方法において、前記フランジ部と前記蓋材とを加熱接合してシールする工程を、環状の凸部を備えたシールヘッドによる少なくとも２回のシール部が重なるシール工程で構成する一方、これら少なくとも２回のシール工程の少なくとも１回のシール工程を、前記環状の凸部の内外周縁部に凹凸部を備えたシールヘッドによるシール工程で構成したことを特徴とするものである。
【００１７】
この容器のシール方法によれば、容器本体の環状のフランジ部に蓋材を加熱接合してシールする容器のシール方法において、前記フランジ部と前記蓋材とを加熱接合してシールする工程を、環状の凸部を備えたシールヘッドによる少なくとも２回のシール部が重なるシール工程で構成する一方、これら少なくとも２回のシール工程の少なくとも１回のシール工程を、前記環状の凸部の内外周縁部に凹凸部を備えたシールヘッドによるシール工程で構成するようにしており、環状の凸部による少なくとも２回のシール部を重ねてヒートシールするようにして短時間でもトータルのシール時間を確保して十分かつ確実な密封性を確保し、そのうち少なくとも１回のヒートシールで前記環状の凸部の内外周縁部に凹凸部によるシールを組み合わせて行うようにしてさらなるシール時間を必要とせずに蓋材の全面を押さえてめくり上がりを防止し、易開封性を確保するようにしている。
【００１８】
また、この発明の請求項２記載の容器のシール方法は、請求項１記載の構成に加え、前記少なくとも１回のシール工程のシールヘッドの前記環状の凸部を、前記内外周縁部の凹凸部に対して突出させてシールすることを特徴とするものである。
【００１９】
この容器のシール方法によれば、前記少なくとも１回のシール工程のシールヘッドの前記環状の凸部を、前記内外周縁部の凹凸部に対して突出させてシールするようにしており、突出させた分だけ強く押さえてシール部を重ねることができ、一層確実に密封性を向上できるようになる。
【００２０】
さらに、この発明の請求項３記載の容器のシール方法は、請求項１または２記載の構成に加え、前記シールヘッドの前記環状の凸部の先端を凸面で構成したことを特徴とするものである。
【００２１】
この容器のシール方法によれば、前記シールヘッドの前記環状の凸部の先端を凸面で構成するようにしており、凸面の中央部が真っ先に接触したのち周囲が接触することで挾雑物があってもこれを周囲に押出すようにでき、一層確実にヒートシールすることができ、密封性を向上するようにしている。
【００２２】
【発明の実施の形態】
以下、この発明の実施の形態について図面を参照しながら詳細に説明する。 図１はこの発明の容器のシール方法を２回のシール工程で構成する一実施の形態に用いるシール装置の概略断面図にかかり、左半分に第１段階のシールヘッドを、右半分に第２段階のシールヘッドをそれぞれ示してある。
【００２３】
この容器のシール方法が適用される容器として、ここでは図２に示す、容器内炊飯用のトレー容器２０を例に説明する。
【００２４】
このトレー容器２０は、分離可能な２つの収納部２１ａ，２１ｂを備えたトレー容器本体２１とこれを密封する蓋材２２とで構成され、それぞれが合成樹脂の積層材で作られる。
【００２５】
そして、トレー容器本体２１は、例えば５層構造とされ、容器外側から基材層として着色用の酸化チタンを添加したポリプロピレン層（厚さ：４６０μｍ）、接着層として変性ポリプロピレン層（厚さ：２０μｍ）、ガスバリヤー層としてエチレンー酢酸ビニル共重合樹脂層（厚さ：３０μｍ）、接着層として変性ポリプロピレン層（厚さ：２０μｍ）、容器内側の基材層としてポリプロピレン層 （厚さ：３７０μｍ）との５層が積層された合計厚さが９００μｍのものを用いる。
【００２６】
また、蓋材２２は、例えば３層構造の合成樹脂積層材が用いられ、容器内側からシーラント層としてポリプロピレン系イージーピールフィルム層（厚さ：５０μｍ）、耐衝撃層としてナイロン層（厚さ：１５μｍ）、容器外側の印刷基材層としてポリエチレンテレフテレート層（厚さ：１２μｍ）との３層が積層された合計厚さが７７μｍのものを用いる。
【００２７】
このような分離可能なトレー容器本体２１は、外側形状が略長方形状とされて中間部が連結された眼鏡状のフランジ部２１ｃを備えており、各収納部２１ａ，２１ｂにそれぞれ内容物が充填され、例えば容器内炊飯を行う場合には、洗浄などの処理がなされた米と水が充填され、蒸気等で加熱するなど所定の工程を経て炊飯が行われたのち、フランジ部２１ｃ全体を覆うように殺菌などの処理が施された蓋材２２が被せられる。
【００２８】
そして、このトレー容器本体２１のフランジ部２１ｃと蓋材２２との密封のため、この発明の容器のシール方法が用いられ、少なくとも２回のシール工程でトレー容器本体２１の内側の基材層のポリプロピレン層と蓋材２２のシーラント層のポリプロピレン系イージーピールフィルム層とが溶融接着されて密封される。
【００２９】
この容器のシール方法は、少なくとも２回のシール工程を備えて構成され、例えば２回のシール工程とする場合には、第１工程で、図１および図３に示すように、環状の凸部１１を備えたシールヘッド１２を用いてヒートシールが行われる。
【００３０】
なお、この２つの収納部２１ａ，２１ｂを備えたトレー容器本体２１では、２つの収納部２１ａ，２１ｂに対応して２つの環状の凸部１１を横に並べて備えたシールヘッド１２が用いられる。
【００３１】
この第１工程の環状の凸部１１によるヒートシールでは、シール面となるトレー容器本体２１のフランジ部２１ｃの幅に対して狭い幅Ｗ1 でシールするもので、例えば凸部１１の幅Ｗ1 を３．５ｍｍ程度とし、図４に示すように、線状のヒートシール部１３をそれぞれの収納部２１ａ，２１ｂの周囲のフランジ部２１ｃのほぼ中央部に形成する。
【００３２】
また、この第１工程のヒートシールのシールヘッド１２の環状の凸部１１の先端を、図３に示すように、横断面形状が下方に突き出した円弧面などの凸面１１ａとすることで、ヒートシールの際、真っ先に凸面１１ａの最下端を接触させ、その後周囲の凸面１１ａを押し付けるようにでき、フランジ部２１ｃと蓋材２２とのシール面間に挾雑物があっても周囲に押し出すようにしてフランジ部２１ｃと蓋材２２とを密着させてシールすることができる。
【００３３】
このような第１工程のヒートシールは、容器内炊飯の製造ラインの工程に合わせて停止可能な短時間の間、例えば０．４５秒程度の短時間で行われる。
【００３４】
こうして第１工程のヒートシールを行ったのち、第２工程のヒートシールが、図１、図５および図６に示すシールヘッド１５を用いて行われる。
【００３５】
この第２工程のヒートシールでは、第１工程のヒートシール部１３に重ねて環状の凸部１６でヒートシールすると同時に、この環状の凸部１６の内外周縁部の凹凸部１７でヒートシールするものである。
【００３６】
この第２工程のヒートシールに用いるシールヘッド１５には、幅方向中央部に環状の凸部１６が形成され、第１工程のヒートシールのシールヘッド１２の環状の凸部１１より狭い幅Ｗ2 で第１工程のヒートシール部１４に重ねてシールして線状のシール部１８を形成できるようにしてあり、例えば幅Ｗ2 を２ｍｍとしてある。そして、この環状の凸部１６の内外周縁部（両側部）に形成する凹凸部１７は、例えばいわゆるローレットで構成され、図６に拡大して示すように、Ｖ字状の溝１７ａを格子状に形成し、これによって残される台形状の部分１７ｂとで凹凸部１７が構成され、例えば溝（凹凸部）１７ａの深さｈを０．１８ｍｍ、溝（凹部）１７ａの表面での幅ｂを０．７５ｍｍ、格子状の台形部分１７ｂの（凸部）表面の正方形の１辺ａを０．３７５ｍｍとしてある。
【００３７】
なお、格子状の寸法ａ，ｂは、必ずしも上記の値に限定されるものではないが、ａ：ｂを１：２程度にするのが、溶着部の外観形状や開口時の膜張り・外観不良防止の点から好ましい。
【００３８】
また、この凹凸部の形状は溝を直交させた格子状に形成して正方形の突起を残すようにする場合に限らず、溝を斜めに交差させたり、曲線状の溝としたり、円柱上や円錘状の突起を残すものなど他の形状であっても良く、蓋材を押さえること等ができるものであれば良い。
【００３９】
このようなシールヘッド１５による第２工程のヒートシールは、図７および図８に示すように、第１工程のヒートシール部１３に重ねて環状の凸部１６でヒートシールすることで、同一部分を２回分のヒートシール時間を確保して線状のシール部１８を形成し、確実に密封することができるようにし、これと同時に、この環状の凸部１６の内外周縁部の凹凸部１７であるローレット部分でヒートシールすることで平面状のヒートシール部１９を形成し、蓋材２２のめくれ上がりを防止するとともに、開封の際の膜張り発生を防止してきれいに開封できるようにする。
【００４０】
なお、蓋材２２の開封を容易とするため、図８に示すように、フランジ部２１ｃの外周縁部の角部にまったくヒートシールしない部分を形成し、この部分から開封を開始できるようにしてある。
【００４１】
このような第２工程のヒートシールも、容器内炊飯の製造ラインの工程に合わせて停止可能な短時間の間、例えば０．４５秒程度の短時間で行われ、環状の凸部１６による線状のヒートシール部１８と同時に、内外周縁部の凹凸部１７による面状のヒートシール部１９でヒートシールが行われ、２回の線状のヒートシール部１３，１７を重ねることで必要な密封性を確保でき、しかも第２工程での面状のヒートシール部１９で、さらなるシール時間を必要とせずに蓋材２２のめくれ上がりの防止とともに、開封の際の膜張り発生を防止でき、易開封性を確保することもできる。
【００４２】
この第２工程のヒートシールの際、環状の凸部１６の先端をその内外周縁部の凹凸部１７より突出させてヒートシールするようにすれば、環状の凸部１６によって強く押さえることができ、線状のヒートシール部１８を一層確実に密着させてシールすることができる。
【００４３】
この場合の環状の凸部１６の先端の突出量は１００μｍ以下が好ましく、１００μｍより大きいと凹凸部１７による面状のヒートシールが不十分となる。
【００４４】
また、この第２工程のシールヘッド１５でも環状の凸部１６の先端を、横断面形状が下方に突き出した円弧面などの凸面１６ａとすることで、ヒートシールの際、真っ先に凸面１６ａの最下端を接触させ、その後周囲の凸面１６ａを押し付けるようにでき、第１工程のヒートシール部１４に挾雑物があっても周囲に押出すようにして密着させてシールすることができる。
【００４５】
この容器のシール方法によれば、第１工程で環状の凸部１１によりヒートシール部１３を形成し、このヒートシール部１３に重ねて第２工程で環状の凸部１６によりヒートシール部１８を形成するとともに、内外周縁部に凹凸部１７によるヒートシール部１９を形成するので、短時間のヒートシール時間でも２回のヒートシール部１３，１８を重ねて確実に密着させて密封性を確保することができ、しかも、第２工程で同時に凹凸部１７で内外周縁部を押えることができ、めくり上がりの防止と易開封性を確保することができる。
【００４６】
したがって、第１工程で環状の凸部１１によるヒートシール部１３の形成と同時に、内外周縁部にローレットなどの凹凸部によるヒートシールを行い、第２工程で環状の凸部１６によるヒートシール部１８だけを形成するようにしたり、第１工程および第２工程のいずれでも環状凸部と内外周縁部の凹凸部によるヒートシールを組み合わせて行うようにしても良い。
【００４７】
また、この実施の形態では、２回の工程でヒートシールするようにしたが、さらに回数を増加しても良く、この場合でも少なくとも１回の工程で環状の凸部によるヒートシールとその内外周縁部の凹凸部によるローレット等のヒートシールを組み合わせるようにすれば良く、１回の停止時間をより短くする場合でもトータルのシール時間を確保でき、特に密封性の確保と同時に、易開封性の確保およびめくり上がり防止に有効である。
【００４８】
さらに、凸部による２回のヒートシール部を重ねる場合に、必ずしも先に広い幅Ｗ1 とし、後で重ねて狭い幅Ｗ2 とする場合に限らず、広狭を逆としたり、ほぼ同一の幅とするようにしても良い。
【００４９】
なお、上記各実施の形態では、容器として２つの収納部を備えた容器内炊飯用のトレー容器を例に説明したが、これに限らず、収納部が１つあるいは３つ以上のトレー容器や他のカップ状の容器など蓋材を容器本体のフランジ部にヒートシールする必要のある容器に広く適用することができる。
【００５０】
また、容器を構成する容器本体および蓋材の材料も上記実施の形態で説明したものに限らず、ヒートシールで加熱接着できる材料のものであれば良い。
【００５１】
【発明の効果】
以上、実施の形態とともに具体的に説明したように、この発明の請求項１記載の容器のシール方法によれば、容器本体の環状のフランジ部に蓋材を加熱接合してシールする容器のシール方法において、前記フランジ部と前記蓋材とを加熱接合してシールする工程を、環状の凸部を備えたシールヘッドによる少なくとも２回のシール部が重なるシール工程で構成する一方、これら少なくとも２回のシール工程の少なくとも１回のシール工程を、前記環状の凸部の内外周縁部に凹凸部を備えたシールヘッドによるシール工程で構成するようにしたので、環状の凸部による少なくとも２回のシール部を重ねてヒートシールするようにして短時間でもトータルのシール時間を確保して十分かつ確実な密封性を確保することができ、そのうち少なくとも１回のヒートシールで前記環状の凸部の内外周縁部に凹凸部によるシールを組み合わせて行うようにしてさらなるシール時間を必要とせずにフランジ部上の蓋材の全面を押さえてめくり上がりを防止し、易開封性を確保することができる。
【００５２】
また、この発明の請求項２記載の容器のシール方法によれば、前記少なくとも１回のシール工程のシールヘッドの前記環状の凸部を、前記内外周縁部の凹凸部に対して突出させてシールするようにしたので、突出させた分だけ強く押さえてシール部を重ねることができ、一層確実に密封性を向上することができる。
【００５３】
さらに、この発明の請求項３記載の容器のシール方法によれば、前記シールヘッドの前記環状の凸部の先端を凸面で構成するようにしたので、凸面の中央部が真っ先に接触したのち周囲が接触することで挾雑物があってもこれを周囲に押出すようにでき、一層確実にヒートシールすることができ、密封性を向上することができる。
【図面の簡単な説明】
【図１】この発明の容器のシール方法を２回のシール工程で構成する一実施の形態に用いるシール装置の概略断面図にかかり、左半分に第１段階のシールヘッドを、右半分に第２段階のシールヘッドをそれぞれ示してある。
【図２】この発明の容器のシール方法を適用する容器の一例にかかる容器内炊飯用のトレー容器の分解斜視図である。
【図３】この発明の容器のシール方法を２回のシール工程で構成する一実施の形態に用いる第１段階のシールヘッドの部分拡大断面図である。
【図４】この発明の容器のシール方法を２回のシール工程で構成する一実施の形態に用いる第１段階のヒートシール部の一部分の平面図である。
【図５】この発明の容器のシール方法を２回のシール工程で構成する一実施の形態に用いる第２段階のシールヘッドの部分拡大断面図である。
【図６】この発明の容器のシール方法を２回のシール工程で構成する一実施の形態に用いる第２段階のシールヘッドの凹凸部の拡大断面図および拡大平面図である。
【図７】この発明の容器のシール方法を２回のシール工程で構成する一実施の形態に用いる第２段階のヒートシール部の拡大断面図である。
【図８】この発明の容器のシール方法を２回のシール工程で構成する一実施の形態に用いる第２段階のヒートシール部の一部分の平面図である。
【符号の説明】
１１ 環状の凸部
１２ シールヘッド
１３ ヒートシール部
１５ シールヘッド
１６ 環状の凸部
１７ 内外周縁部の凹凸部
１８ ヒートシール部
１９ ヒートシール部
２０ トレー容器
２１ トレー容器本体
２１ａ，２１ｂ 収納部
２１ｃ フランジ部
２２ 蓋材
Ｗ1 第１工程の環状の凸部のヒートシール部の幅
Ｗ2 第２工程の状の凸部のヒートシール部の幅
ａ 凹凸部の凸部の１辺の長さ
ｂ 凹凸部の凹部の間隔
ｈ 凹凸部の凹凸の深さ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a container sealing method, which is excellent in sealing and easy opening when a lid material is heat-sealed to a container body containing food or beverage, and is particularly suitable for sealing at high speed. .
[0002]
[Prior art]
Conventionally, plastic or foamed plastic cups or trays have been used as containers for food and beverages. After filling the container body with food, etc., the flange at the upper end of the opening is used. A method of heat-sealing by applying pressure while heating for covering and sealing a film-like cover material is widely used.
[0003]
In such containers for storing foods and beverages, sufficient sealability is required to enhance the shelf life of the contents, while easy opening is required so that the lid can be easily opened to take out the contents. It is said.
[0004]
Various proposals have been made for heat sealing of such container lid materials, and heat sealing parts having different shapes can be formed at one time, and heat sealing parts divided into two stages. There is something to heat seal.
[0005]
As for heat sealing in the former two stages, for example, in (1) Japanese Patent Application Laid-Open No. 57-153806, the entire flange surface of the container body and the lid are lightly welded in the first stage, and lightly in the second stage. A narrow ring-shaped strong welding is performed on the welded surface.
[0006]
(2) In Japanese Patent Laid-Open No. 63-5, only the inner peripheral edge of the bonding surface is heated and bonded in the first stage, and the entire outer peripheral edge is the inner peripheral edge of the entire bonding surface in the second stage. In this way, the heat bonding is performed so that the applied pressure decreases toward the surface.
[0007]
Further, in (3) Japanese Patent Laid-Open No. 2-109835, at least one of the upper and lower sealing heads is in a convex shape and is in line contact in the first stage, and heat sealing is performed, and in the second stage, the upper and lower seals are flat. The head is heat sealed.
[0008]
(4) In Japanese Patent Laid-Open No. 2000-85708, heat sealing is performed with a seal head provided with a lattice-shaped recess in the first stage, and heat is applied with a seal head provided with a ring-shaped protrusion in the second stage. I try to seal it.
[0009]
For example, in (1) Japanese Patent Laid-Open No. 3-666, the outer and inner annular portions of the joint surface are heat-sealed in a continuous uneven shape, The part is heat-sealed flat.
[0010]
(2) In Japanese Patent Application Laid-Open No. 7-17568, a flat seal, a comb tooth seal, and a mesh seal are formed from the outside to the inside of the joint surface to perform heat sealing.
[0011]
Further, (3) In Japanese Patent Laid-Open No. 63-281908, among the upper and lower seal heads, the upper seal head is formed with an inner and outer double annular ridge, and the inner ridge is positioned below the outer side. And heat-sealing.
[0012]
According to these heat sealing methods, the time required for one heat sealing is usually 1 second or longer, and in some cases 2 seconds or longer, and a reliable sealing performance is obtained with a convex heat sealing portion pressed firmly with a narrow width. On the other hand, the entire joint surface is lightly pressed, or the surface heat seal portion such as a grid-like unevenness is pressed to prevent the outer peripheral edge of the lid material from being turned up, and the easy opening of the lid material is ensured.
[0013]
[Problems to be solved by the invention]
However, the production line is being speeded up to improve productivity when filling food and beverages into containers, and heat sealing can be performed with a stop time of 1 second or longer as before. However, in any of the conventional heat sealing methods, there is a problem that sufficient and reliable sealing performance cannot be obtained even if the easy opening of the lid material can be ensured in a short time, for example, about 0.45 seconds.
[0014]
The present invention has been made to solve the problems of the prior art, and can provide sufficient and reliable sealing performance in a short time, and can ensure easy opening necessary for taking out the contents. The present invention is intended to provide a container sealing method that can suppress the turning-up of the lid material.
[0015]
[Means for Solving the Problems]
As a result of intensive studies on the heat sealing method of the container by the present inventors, it is possible to secure a total sealing time by heat-sealing the same part at least twice even in a short time, and a narrow convex shape At least two times, the seal part is heat-sealed to ensure hermeticity, and the inner and outer peripheral edges of the convex seal part are formed with an uneven seal part at the time of one-time heat sealing. It has been found that easy-openability can be ensured by heat sealing so as to hold the entire surface of the lid, and the present invention has been completed.
[0016]
That is, in order to solve the above-described problems of the prior art, a container sealing method according to claim 1 of the present invention is a container sealing method in which a lid member is heated and bonded to an annular flange portion of a container body. The step of heat-bonding and sealing the flange portion and the lid member is constituted by a sealing step in which at least two sealing portions are overlapped by a seal head having an annular convex portion, and at least these two sealing steps The at least one sealing step is configured by a sealing step using a seal head provided with concave and convex portions on the inner and outer peripheral edge portions of the annular convex portion.
[0017]
According to this container sealing method, in the container sealing method in which the lid member is heated and bonded to the annular flange portion of the container body, the step of heat bonding and sealing the flange portion and the lid material, At least one sealing step of at least two sealing steps is formed by a sealing step in which at least two sealing portions are overlapped by a sealing head having an annular convex portion, and at least one sealing step is performed on the inner and outer peripheral edge portions of the annular convex portion. In order to secure a total sealing time even in a short time, it is configured by a sealing process with a sealing head provided with uneven portions, and heat sealing is performed by overlapping at least two sealing portions with annular convex portions. Ensuring sufficient and reliable sealing performance, combining at least one heat seal with seals with irregularities on the inner and outer peripheral edges of the annular convex part Prevents turned up by pressing the entire surface of the lid member without requiring additional sealing time in the Migihitsuji, thereby ensuring the easy-open performance.
[0018]
According to a second aspect of the present invention, in addition to the structure of the first aspect, the annular convex portion of the seal head in the at least one sealing step is replaced with the concave / convex portion of the inner / outer peripheral edge portion. It protrudes with respect to and seals.
[0019]
According to this container sealing method, the annular convex portion of the seal head in the at least one sealing step is projected with respect to the concave and convex portions of the inner and outer peripheral edge portions and sealed. The seal portion can be stacked by pressing firmly as much as possible, and the sealing performance can be improved more reliably.
[0020]
Furthermore, the container sealing method according to claim 3 of the present invention is characterized in that, in addition to the configuration according to claim 1 or 2, the tip of the annular convex portion of the seal head is configured by a convex surface. is there.
[0021]
According to this container sealing method, the tip of the annular convex portion of the seal head is configured as a convex surface, and impurities come into contact with the periphery after the central portion of the convex surface comes into contact first. Even if it exists, this can be extruded to the circumference | surroundings, and it can heat-seal more reliably and is trying to improve sealing performance.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a sealing device used in an embodiment in which the container sealing method of the present invention is constituted by two sealing steps. The first stage sealing head is on the left half and the second is on the right half. Each stage seal head is shown.
[0023]
As a container to which this container sealing method is applied, a tray container 20 for cooking rice in a container shown in FIG. 2 will be described here as an example.
[0024]
The tray container 20 includes a tray container main body 21 having two separable storage portions 21a and 21b and a lid member 22 that seals the tray container body 21, and each is made of a synthetic resin laminate.
[0025]
The tray container main body 21 has, for example, a five-layer structure. From the outside of the container, a polypropylene layer (thickness: 460 μm) to which coloring titanium oxide is added as a base material layer, and a modified polypropylene layer (thickness: 20 μm) as an adhesive layer. ), An ethylene-vinyl acetate copolymer resin layer (thickness: 30 μm) as a gas barrier layer, a modified polypropylene layer (thickness: 20 μm) as an adhesive layer, and a polypropylene layer (thickness: 370 μm) as a base material layer inside the container The total thickness of five layers is 900 μm.
[0026]
The cover material 22 is made of, for example, a synthetic resin laminate having a three-layer structure, and a polypropylene easy peel film layer (thickness: 50 μm) as a sealant layer from the inside of the container, and a nylon layer (thickness: 15 μm) as an impact resistant layer. ), And a printing substrate layer outside the container having a total thickness of 77 μm in which three layers of polyethylene terephthalate layers (thickness: 12 μm) are laminated.
[0027]
Such a separable tray container body 21 includes a spectacle-shaped flange portion 21c whose outer shape is substantially rectangular and has an intermediate portion connected thereto, and each storage portion 21a, 21b is filled with contents. For example, when cooking in a container, rice and water that have been treated such as washing are filled, and after cooking through a predetermined process such as heating with steam, the entire flange portion 21c is covered. Thus, the lid | cover material 22 to which the process of sterilization etc. was given is covered.
[0028]
The container sealing method of the present invention is used to seal the flange portion 21c of the tray container body 21 and the lid member 22, and the base material layer inside the tray container body 21 is sealed at least twice. The polypropylene layer and the polypropylene-based easy peel film layer of the sealant layer of the lid member 22 are melt bonded and sealed.
[0029]
This container sealing method is configured to include at least two sealing steps. For example, in the case of two sealing steps, in the first step, as shown in FIG. 1 and FIG. Heat sealing is performed using a seal head 12 having 11.
[0030]
In the tray container main body 21 provided with the two storage portions 21a and 21b, a seal head 12 provided with two annular convex portions 11 arranged side by side corresponding to the two storage portions 21a and 21b is used.
[0031]
In the heat sealing by the annular convex portion 11 in the first step, sealing is performed with a narrow width W1 with respect to the width of the flange portion 21c of the tray container body 21 serving as a sealing surface. For example, the width W1 of the convex portion 11 is 3 4. As shown in FIG. 4, the linear heat seal part 13 is formed in the substantially center part of the flange part 21c around each accommodating part 21a, 21b.
[0032]
Further, as shown in FIG. 3, the tip of the annular convex portion 11 of the seal head 12 of the heat seal in the first step is formed as a convex surface 11a such as an arc surface with a transverse cross-section protruding downward. At the time of sealing, the lowermost end of the convex surface 11a can be brought into contact first, and then the peripheral convex surface 11a can be pressed, and even if there is a contaminant between the sealing surfaces of the flange portion 21c and the lid member 22, it is pushed out to the periphery. Thus, the flange portion 21c and the lid member 22 can be tightly sealed.
[0033]
Such heat sealing in the first step is performed in a short period of time, for example, about 0.45 seconds, which can be stopped in accordance with the process of the in-container cooking line.
[0034]
After performing the heat sealing in the first step in this way, the heat sealing in the second step is performed using the seal head 15 shown in FIGS. 1, 5, and 6.
[0035]
In the heat sealing in the second step, heat sealing is performed with the convex portion 16 on the inner and outer peripheral portions of the annular convex portion 16 at the same time as the heat sealing portion 13 is overlapped with the heat sealing portion 13 in the first step. It is.
[0036]
The seal head 15 used for heat sealing in the second step has an annular convex portion 16 formed in the center in the width direction, and has a width W2 narrower than the annular convex portion 11 of the seal head 12 of the heat seal in the first step. The linear seal portion 18 can be formed by overlapping and sealing the heat seal portion 14 in the first step, and the width W2 is set to 2 mm, for example. And the uneven | corrugated | grooved part 17 formed in the inner and outer peripheral edge part (both sides) of this cyclic | annular convex part 16 is comprised, for example with what is called a knurling, and as shown in an enlarged view in FIG. And the trapezoidal portion 17b that is left behind thereby forms the concavo-convex portion 17. For example, the depth h of the groove (concave portion) 17a is 0.18 mm, and the width b on the surface of the groove (concave portion) 17a is One side a of the square on the (convex) surface of the 0.75 mm lattice-shaped trapezoidal portion 17 b is 0.375 mm.
[0037]
Note that the grid-like dimensions a and b are not necessarily limited to the above values, but a: b is set to about 1: 2 for the appearance shape of the welded portion and the film tension and appearance at the time of opening. This is preferable from the viewpoint of preventing defects.
[0038]
In addition, the shape of the concavo-convex portion is not limited to the case where the grooves are formed in a grid pattern orthogonal to leave a square protrusion, but the grooves are crossed diagonally, curved grooves, Other shapes, such as those that leave a conical protrusion, may be used, as long as they can hold the lid.
[0039]
As shown in FIGS. 7 and 8, the heat seal in the second step by such a seal head 15 is overlapped with the heat seal portion 13 in the first step and heat-sealed with an annular convex portion 16, thereby the same part. The linear seal portion 18 is formed by securing a heat sealing time for two times, and can be surely sealed. At the same time, the concave and convex portions 17 on the inner and outer peripheral edge portions of the annular convex portion 16 By heat-sealing at a certain knurled portion, a planar heat-sealing portion 19 is formed to prevent the cover material 22 from being turned up, and to prevent the occurrence of film tension at the time of opening, so that it can be opened cleanly.
[0040]
In order to facilitate the opening of the lid member 22, as shown in FIG. 8, a portion that is not heat-sealed is formed at the corner of the outer peripheral edge of the flange portion 21c so that the opening can be started from this portion. is there.
[0041]
Such heat sealing in the second step is also performed in a short period of time, for example, about 0.45 seconds, which can be stopped in accordance with the process of the in-container rice cooking line. At the same time as the heat-seal portion 18, heat sealing is performed by the planar heat-seal portion 19 formed by the concavo-convex portions 17 on the inner and outer peripheral edges, and necessary sealing is achieved by overlapping the two linear heat-seal portions 13 and 17. In addition, the planar heat seal part 19 in the second step can prevent the cover material 22 from turning up and prevent the film from being stretched at the time of opening. Openability can also be secured.
[0042]
At the time of heat sealing in the second step, if the tip of the annular convex portion 16 protrudes from the concave and convex portion 17 on the inner and outer peripheral edges and heat seals, it can be strongly pressed by the annular convex portion 16, The linear heat seal part 18 can be more closely attached and sealed.
[0043]
In this case, the protruding amount of the tip of the annular convex portion 16 is preferably 100 μm or less, and if it is larger than 100 μm, the surface heat sealing by the uneven portion 17 becomes insufficient.
[0044]
Also, in the seal head 15 of the second step, the tip of the annular convex portion 16 is formed as a convex surface 16a such as an arc surface with a cross-sectional shape projecting downward, so that the top of the convex surface 16a is first in heat sealing. The lower end is brought into contact, and then the surrounding convex surface 16a can be pressed, and even if there is a contaminant in the heat seal part 14 in the first step, it can be sealed by being pushed out to the periphery.
[0045]
According to this container sealing method, the heat seal portion 13 is formed by the annular projection 11 in the first step, and the heat seal portion 18 is formed by the annular projection 16 in the second step on the heat seal portion 13. At the same time, since the heat seal portion 19 is formed by the concave and convex portions 17 on the inner and outer peripheral edge portions, the heat seal portions 13 and 18 are overlapped with each other even in a short heat seal time, thereby ensuring tight sealing. In addition, the inner and outer peripheral edge portions can be pressed by the concavo-convex portion 17 at the same time in the second step, and the prevention of turning-up and easy opening can be ensured.
[0046]
Therefore, at the same time as the formation of the heat seal portion 13 by the annular convex portion 11 in the first step, heat sealing by an uneven portion such as a knurling is performed on the inner and outer peripheral edge portions, and the heat seal portion 18 by the annular convex portion 16 in the second step. Only in the first step and in the second step, heat sealing by the annular convex portion and the concave and convex portions of the inner and outer peripheral edge portions may be performed in combination.
[0047]
In this embodiment, heat sealing is performed in two steps. However, the number of times may be further increased. In this case, heat sealing by an annular convex portion and its inner and outer peripheral edges in at least one step. It is only necessary to combine heat seals such as knurling with the uneven parts of the part, and even if the stop time is shortened once, the total sealing time can be secured, especially at the same time as securing the sealing property and ensuring easy opening It is also effective for preventing flip-up.
[0048]
Further, when the heat seal portions are overlapped twice by the convex portion, the width is not necessarily limited to the wide width W1 first, and is not limited to the narrow width W2 to be overlapped later. You may do it.
[0049]
In each of the above embodiments, a tray container for cooking rice in a container provided with two storage units as an example has been described as an example. However, the present invention is not limited to this, and one or three or more tray containers or The present invention can be widely applied to containers that need to be heat-sealed to the flange portion of the container body, such as other cup-shaped containers.
[0050]
Moreover, the material of the container main body and the lid material constituting the container is not limited to that described in the above embodiment, and any material that can be heat bonded by heat sealing may be used.
[0051]
【The invention's effect】
As described above in detail with the embodiment, according to the container sealing method of the first aspect of the present invention, the container seal that seals by sealing the lid material to the annular flange portion of the container body. In the method, the step of heat-bonding and sealing the flange portion and the lid member is constituted by a sealing step in which at least two seal portions are overlapped by a seal head having an annular convex portion, while at least two times. Since at least one sealing step of the sealing step is constituted by a sealing step using a seal head having an uneven portion on the inner and outer peripheral edge portions of the annular convex portion, at least two times of sealing by the annular convex portion By overlapping the parts and heat-sealing, the total sealing time can be secured even in a short time to ensure sufficient and reliable sealing performance, at least of which In this way, the inner and outer peripheral edges of the annular convex part are combined with the seals by the concave and convex parts in a single heat seal, and the entire cover material on the flange part is pressed and prevented from being turned up without requiring additional sealing time. , Easy openability can be ensured.
[0052]
According to the container sealing method of the second aspect of the present invention, the annular convex portion of the seal head in the at least one sealing step is protruded from the concave and convex portions of the inner and outer peripheral edge portions. Since it was made to do, it can hold down only the part which made it protrude and can overlap a seal part, and can improve sealing performance more reliably.
[0053]
Furthermore, according to the container sealing method according to claim 3 of the present invention, the tip of the annular convex portion of the seal head is formed as a convex surface, so that the peripheral portion after the central portion of the convex surface comes into contact first. Even if there is a foreign substance by contacting, it can be pushed out to the surroundings, heat sealing can be performed more reliably, and the sealing performance can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a sealing device used in an embodiment in which the container sealing method of the present invention is constituted by two sealing steps, with a first stage sealing head on the left half and a first in the right half; A two-stage seal head is shown respectively.
FIG. 2 is an exploded perspective view of a tray container for cooking rice in a container according to an example of a container to which the container sealing method of the present invention is applied.
FIG. 3 is a partially enlarged cross-sectional view of a first-stage seal head used in an embodiment in which the container sealing method of the present invention is configured by two sealing steps.
FIG. 4 is a plan view of a part of a first stage heat seal portion used in an embodiment in which the container sealing method of the present invention is constituted by two sealing steps.
FIG. 5 is a partially enlarged cross-sectional view of a second-stage seal head used in an embodiment in which the container sealing method of the present invention is constituted by two sealing steps.
FIGS. 6A and 6B are an enlarged cross-sectional view and an enlarged plan view of a concavo-convex portion of a second-stage seal head used in an embodiment in which the container sealing method of the present invention is configured by two sealing steps.
FIG. 7 is an enlarged cross-sectional view of a second stage heat seal portion used in an embodiment in which the container sealing method of the present invention is constituted by two sealing steps.
FIG. 8 is a plan view of a part of a second stage heat seal portion used in an embodiment in which the container sealing method of the present invention is constituted by two sealing steps.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Annular convex part 12 Seal head 13 Heat seal part 15 Seal head 16 Annular convex part 17 Uneven | corrugated | grooved part 18 inner and outer peripheral edge part 18 Heat seal part 19 Heat seal part 20 Tray container 21 Tray container main body 21a, 21b Storage part 21c Flange part 22 Lid W1 Width of heat-sealed portion of annular convex portion in first step W2 Width of heat-sealed portion of convex portion in the second step a Length of one side of convex portion of concave-convex portion concave portion of concave-convex portion Interval h Depth of concavo-convex part

Claims (3)

容器本体の環状のフランジ部に蓋材を加熱接合してシールする容器のシール方法において、
前記フランジ部と前記蓋材とを加熱接合してシールする工程を、環状の凸部を備えたシールヘッドによる少なくとも２回のシール部が重なるシール工程で構成する一方、
これら少なくとも２回のシール工程の少なくとも１回のシール工程を、前記環状の凸部の内外周縁部に凹凸部を備えたシールヘッドによるシール工程で構成したことを特徴とする容器のシール方法。In a container sealing method in which a lid is heated and bonded to an annular flange portion of a container body,
While the step of heat-bonding and sealing the flange portion and the lid member is configured by a sealing step in which at least two seal portions are overlapped by a seal head having an annular convex portion,
A sealing method for a container, wherein at least one sealing step of at least two sealing steps is configured by a sealing step using a seal head having an uneven portion on the inner and outer peripheral edge portions of the annular convex portion. 前記少なくとも１回のシール工程のシールヘッドの前記環状の凸部を、前記内外周縁部の凹凸部に対して突出させてシールすることを特徴とする請求項１記載の容器のシール方法。The container sealing method according to claim 1, wherein the annular convex portion of the seal head in the at least one sealing step is protruded with respect to the concave and convex portions of the inner and outer peripheral edge portions and sealed. 前記シールヘッドの前記環状の凸部の先端を凸面で構成したことを特徴とする請求項１または２記載の容器のシール方法。The container sealing method according to claim 1 or 2, wherein a tip of the annular convex portion of the seal head is formed as a convex surface.
JP2001127157A 2001-04-25 2001-04-25 Container sealing method Expired - Lifetime JP4135334B2 (en)

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KR20170008839A (en) * 2014-08-22 2017-01-24 가즈오 히시누마 Compound heat seal structure capable of being fitted to level difference of stacked area

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CN101842221A (en) * 2007-10-31 2010-09-22 诺瓦提斯公司 Packaging seal plate having a shaped face
JP5660297B2 (en) * 2010-09-06 2015-01-28 東洋製罐株式会社 Presser block and sealing device using the presser block
EP2935016B1 (en) 2012-12-21 2016-09-28 Novartis AG Contact lens package
JP2017052544A (en) * 2015-09-10 2017-03-16 東洋製罐株式会社 Square-shaped hermetic container and heat seal method thereof
JP2020075368A (en) * 2018-11-05 2020-05-21 豊田合成株式会社 Method for manufacturing hollow component
WO2022085089A1 (en) * 2020-10-20 2022-04-28 株式会社日清製粉ウェルナ Manufacturing method for frozen food packaging container

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Publication number Priority date Publication date Assignee Title
KR20170008839A (en) * 2014-08-22 2017-01-24 가즈오 히시누마 Compound heat seal structure capable of being fitted to level difference of stacked area
KR101994083B1 (en) * 2014-08-22 2019-07-01 가즈오 히시누마 Compound heat seal structure capable of being fitted to level difference of stacked area

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