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JPH0694209B2 - Laminated sheet for multilayer package, multilayer package, and method for producing multilayer package - Google Patents

Laminated sheet for multilayer package, multilayer package, and method for producing multilayer package

Info

Publication number
JPH0694209B2
JPH0694209B2 JP24520789A JP24520789A JPH0694209B2 JP H0694209 B2 JPH0694209 B2 JP H0694209B2 JP 24520789 A JP24520789 A JP 24520789A JP 24520789 A JP24520789 A JP 24520789A JP H0694209 B2 JPH0694209 B2 JP H0694209B2
Authority
JP
Japan
Prior art keywords
layer
surface layer
multilayer package
multilayer
laminated sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP24520789A
Other languages
Japanese (ja)
Other versions
JPH03108539A (en
Inventor
幸夫 高田
剛 篠原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Idemitsu Petrochemical Co Ltd
Original Assignee
Idemitsu Petrochemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Idemitsu Petrochemical Co Ltd filed Critical Idemitsu Petrochemical Co Ltd
Priority to JP24520789A priority Critical patent/JPH0694209B2/en
Publication of JPH03108539A publication Critical patent/JPH03108539A/en
Publication of JPH0694209B2 publication Critical patent/JPH0694209B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/007—Forming single grooves or ribs, e.g. tear lines, weak spots
    • 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
    • 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
    • B29C66/2422—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 circular, oval or elliptical
    • B29C66/24221—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 circular, oval or elliptical being circular
    • 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
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—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
    • B29C66/731—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 intensive physical properties of the material of the parts to be joined
    • B29C66/7311—Thermal properties
    • B29C66/73115—Melting point
    • 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
    • B29C66/731—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 intensive physical properties of the material of the parts to be joined
    • B29C66/7311—Thermal properties
    • B29C66/73115—Melting point
    • B29C66/73116—Melting point of different melting point, i.e. the melting point of one of the parts to be joined being different from the melting point of the other part
    • 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
    • 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
    • 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
    • B29C66/81431—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 cavity, e.g. a groove
    • 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
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/065—HDPE, i.e. high density polyethylene
    • 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
    • B29L2009/00—Layered products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Closing Of Containers (AREA)
  • Packages (AREA)
  • Laminated Bodies (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は軽量容器分野に用いられる多層包装体用積層シ
ート、そのシートを用いた多層包装体及び多層包装体の
製造方法に関するものである。さらに詳しくいえば、本
発明は、食品、飲料等の包装用、特に加熱殺菌包装用と
して好適に用いられる密封性、開封性ともに優れている
多層包装体とその多層包装体用積層シートに関する。本
発明はまた、その多層包装体の好適な製造方法に関す
る。TECHNICAL FIELD The present invention relates to a laminated sheet for a multilayer package used in the field of lightweight containers, a multilayer package using the sheet, and a method for producing a multilayer package. More specifically, the present invention relates to a multilayer package having excellent sealing property and openability, which is preferably used for packaging foods, beverages and the like, particularly for heat sterilization packaging, and a laminated sheet for the multilayer package. The present invention also relates to a suitable method for producing the multilayer package.

〔従来の技術〕[Conventional technology]

従来、食品類などの包装のための軽量容器分野におい
て、密封性に優れるとともに開封性にも優れている各種
の易開封性容器が提案されている。例えば、容器本体を
積層構造として蓋材をヒートシールした場合、この容器
を開封する際、蓋材にヒートシールされた容器本体側の
最内層とそれに接する層との層間を剥離させ、該最内層
をヒートシール部内側に設けられた薄肉部でエッジ切れ
により切断させる易開封性容器が提案されている（特開
昭63−307073号公報、実開昭64−39273号公報、特開昭6
4−70374号公報）。BACKGROUND ART Conventionally, in the field of lightweight containers for packaging foods and the like, various types of easy-open containers having excellent sealing properties and excellent opening properties have been proposed. For example, in the case where the container body has a laminated structure and the lid material is heat-sealed, when the container is opened, the interlayer between the innermost layer on the container body side heat-sealed by the lid material and the layer in contact with the innermost layer is peeled off, and the innermost layer is formed. An easily openable container has been proposed in which a thin wall portion provided inside the heat seal portion is cut by edge cutting (Japanese Patent Laid-Open No. 63-307073, Japanese Utility Model Laid-Open No. 64-39273, Japanese Patent Laid-Open No. 6-27373).
4-70374).

しかし、これらの容器では未だ容器本体の最内層の切断
時のエッジ切れ特性が不十分であり、切断ができなかっ
たり、均一に切れずに容器本体の最内層が伸びてヒゲ等
が発生しピール感に劣り、外観上からも好ましいとはい
えないという問題がある。However, in these containers, the edge cutting characteristics when cutting the innermost layer of the container body are still insufficient, it is not possible to cut, or the innermost layer of the container body does not cut evenly and the beard occurs and peeling occurs. There is a problem that it is inferior in feeling and is not preferable in terms of appearance.

〔発明が解決しようとする課題〕[Problems to be Solved by the Invention]

エッジ切れ特性を改良するための一般法としてエッジ切
れさせる層にポリエチレンワックス、アタクチックポリ
プロピレン等の低分子量分を配合する方法があるが、こ
の方法を上記の容器に応用すると、ボイルレトルト時に
低分子量分の溶出や層の劣化が起こり、また耐内容物
性、衛生性に劣るなどの問題が生じる。As a general method for improving the edge cutting property, there is a method of blending a low molecular weight component such as polyethylene wax or atactic polypropylene in the layer to be cut into the edge, but when this method is applied to the above container, it has a low molecular weight at the time of boil retort. This causes problems such as elution of the components and deterioration of the layer, and poor content resistance and hygiene.

そこで、本発明は蓋材をヒートシールした容器のシール
層に凹状の弱め線を設け、シール面と剥離面を異なる面
として、開封時に剥離したシール層を該弱め線でエッジ
切れさせて開封する多層包装体容器で、そのシール層の
エッジ切れによるカット性を向上させて、シールが完全
でかつ開封が容易なボイルレトルト殺菌可能な多層包装
体とその多層包装体用積層シートを提供しようとするも
のである。本発明はまた、その多層包装体の好適な製造
方法を提供しようとするものである。Therefore, in the present invention, a concave weakening line is provided on the sealing layer of the container in which the lid material is heat-sealed, and the sealing surface and the peeling surface are different faces, and the sealing layer peeled off at the time of opening is cut along the weakening line to open. In a multi-layered package container, it is intended to provide a multi-layered package and a laminated sheet for the multi-layered package which are improved in cuttability due to edge breakage of the seal layer and which can be sterilized by boil retort with complete sealing and easy opening. It is a thing. The present invention also seeks to provide a suitable method for producing the multilayer package.

〔課題を解決するための手段〕[Means for Solving the Problems]

本発明者らは前記課題を解決するため鋭意研究を重ねた
結果、シール層を剥離性表面層としてメルトインデック
スの異なる少なくとも２種の高密度ポリエチレンを用い
て形成することにより、エッジ切れによるカット性が向
上することを見出し本発明を完成するに至った。The inventors of the present invention have conducted extensive studies to solve the above-mentioned problems, and as a result, by forming at least two kinds of high-density polyethylene having different melt indexes as the peelable surface layer for the seal layer, the cut property due to edge breakage is obtained. Therefore, the present invention has been completed and the present invention has been completed.

すなわち本発明は、少なくとも剥離性表面層とこれに接
する層とからなり、該剥離性表面層がメルトインデック
スの異なる少なくとも２種の高密度ポリエチレンからな
る厚み５μｍ以上の層であることを特徴とする多層包装
体用積層シートを提供するものである。That is, the present invention is characterized in that it comprises at least a peelable surface layer and a layer in contact therewith, and the peelable surface layer is a layer having a thickness of 5 μm or more and made of at least two kinds of high-density polyethylene having different melt indexes. A laminated sheet for a multilayer package is provided.

本発明の多層包装体用積層シートは少なくとも剥離性表
面層とこれに接する層とからなる。The laminated sheet for a multilayer package of the present invention comprises at least a peelable surface layer and a layer in contact therewith.

剥離性表面層の厚みは、５〜150μｍが好ましい。特に
好ましくは８〜100μｍであり、更に好ましくは８〜50
μｍである。厚みが５μｍ未満では多層包装体に用いた
場合密封力不足となり、逆に150μｍを超えるとエッジ
切れを起こさせるための凹状の弱め線形成による該層の
薄肉化が不良となる。The thickness of the peelable surface layer is preferably 5 to 150 μm. It is particularly preferably 8 to 100 μm, further preferably 8 to 50 μm.
μm. If the thickness is less than 5 μm, the sealing force will be insufficient when used in a multilayer package, and conversely, if it exceeds 150 μm, thinning of the layer will be unsatisfactory due to the formation of concave weakening lines for causing edge breakage.

この剥離性表面層はメルトインデックスの異なる少なく
とも２種の高密度ポリエチレンからなるが、剥離性表面
層のメルトインデックスは0.01〜30の間であれば特に制
限されない。メルトインデックスの異なる高密度ポリエ
チレンの数は２種とするのが好ましいが、２種を超えて
も良い。高密度ポリエチレンの数が２種の場合、両者の
メルトインデックスの差は２以上であることが好まし
い。特に好ましくは４以上である。この差が２未満の場
合には、エッジ切れによるカット性が不足する。ここ
で、メルトインデックスの値は、JIS −7210に規定さ
れる条件（190℃、2.16kg荷重、10分間）で測定した。The peelable surface layer is composed of at least two kinds of high-density polyethylene having different melt indexes, but the melt index of the peelable surface layer is not particularly limited as long as it is between 0.01 and 30. The number of high-density polyethylenes having different melt indexes is preferably two, but may be more than two. When the number of high-density polyethylenes is 2, it is preferable that the difference in melt index between the two is 2 or more. Particularly preferably, it is 4 or more. If this difference is less than 2, the cutability due to edge breakage is insufficient. Here, the value of the melt index was measured under the conditions specified in JIS-7210 (190 ° C, 2.16 kg load, 10 minutes).

メルトインデックスの異なる２種の高密度ポリエチレン
の配合比は、メルトインデックスの大きい高密度ポリエ
チレン：メルトインデックスの小さい高密度ポリエチレ
ンが重量比で5:95〜95:5であることが好ましい。特に好
ましくは20:80〜80:20である。この範囲外では、得られ
る剥離性表面層のエッジ切れによるカット性が不足す
る。上記の配合比でメルトインデックスの差が２以上の
高密度ポリエチレンを、得られる剥離性表面層のメルト
インデックスが0.01〜30の間となるようにすることが好
ましい。The mixing ratio of two kinds of high-density polyethylenes having different melt indexes is preferably 5:95 to 95: 5 by weight ratio of high-density polyethylene having a large melt index: high-density polyethylene having a small melt index. Particularly preferred is 20:80 to 80:20. Outside this range, the resulting peelable surface layer lacks in cuttability due to edge breakage. It is preferable to use a high-density polyethylene having a melt index difference of 2 or more at the above blending ratio so that the resulting peelable surface layer has a melt index of 0.01 to 30.

本発明の多層包装体用積層シートは共押出法により好適
に成形されるが、その場合にメルトインデックスの小さ
い高密度ポリエチレンの割合がメルトインデックスの大
きい高密度ポリエチレンの割合より高い方が押出上、安
定で好ましい。The multilayer sheet for a multilayer package of the present invention is preferably formed by a coextrusion method, in which case the proportion of high density polyethylene having a small melt index is higher than the proportion of high density polyethylene having a large melt index in extrusion. Stable and preferable.

剥離性表面層に接する層は、上記の層間剥離強度の条件
を満たすものであれば特に制限はなく、ポリオレフィン
系樹脂、ポリスチレン系樹脂、ポリアミド系樹脂、ポリ
エステル系樹脂、ポリカーボネート系樹脂又はこれらの
混合物又はこれらに熱可塑性エラストマー、各種添加剤
若しくは無機充填剤を５〜70重量％混合した樹脂あるい
は金属箔などが挙げられる。The layer in contact with the peelable surface layer is not particularly limited as long as it satisfies the above-mentioned interlayer peeling strength, and a polyolefin resin, a polystyrene resin, a polyamide resin, a polyester resin, a polycarbonate resin or a mixture thereof. Alternatively, a thermoplastic elastomer, a resin or a metal foil in which various additives or inorganic fillers are mixed in an amount of 5 to 70% by weight can be used.

剥離性表面層とこれに接する層との層間は、この多層包
装体用積層シートを容器本体に熱成形し蓋材をヒートシ
ールして多層包装体としたとき、開封時の剥離面とな
る。従って、剥離性表面層とこれに接する層との層間の
剥離強度は、シール面すなわち蓋材と剥離性表面層との
層間のヒートシール強度より小さく、蓋材を剥離する際
剥離面で剥離が開始され蓋材の開封が容易である強度範
囲とする。上記範囲であれば特に制限はないが、好まし
くは200〜1500g/15mm（引張速度300mm/min、以下同じ）
であり、特に好ましくは300〜1200g/15mm程度である。
包装体の使用分野によって適宜決定すればよい。The interlayer between the releasable surface layer and the layer in contact with the releasable surface layer serves as a peeling surface at the time of opening when the laminated sheet for a multilayer package is thermoformed on the container body and the lid material is heat-sealed to form a multilayer package. Therefore, the peel strength between the peelable surface layer and the layer in contact with the peelable surface layer is smaller than the heat seal strength between the seal surface, that is, the interlayer between the lid material and the peelable surface layer, and peeling occurs at the peel surface when peeling the lid material. The strength range is set so that the lid material can be opened easily after starting. There is no particular limitation as long as it is within the above range, but preferably 200 to 1500 g / 15 mm (pulling speed 300 mm / min, the same applies hereinafter)
And particularly preferably about 300 to 1200 g / 15 mm.
It may be appropriately determined depending on the field of use of the package.

以上の剥離性表面層とこれに接する層とからなる本発明
の多層包装体用積層シートは共押出法により好適に形成
される。すなわち、メルトインデックスの異なる少なく
とも２種のビーズ状、ペレット状等の高密度ポリエチレ
ンは、好ましくは押出機中で混合され、押し出されて剥
離性表面層となる。同時に、共押出により、この剥離性
表面層に接する層も成形され、本発明の多層包装体用積
層シートとなる。ここで、押出機中でのメルトインデッ
クスの異なる少なくとも２種の高密度ポリエチレンが混
合される温度は150〜300℃が好ましい。特に好ましくは
190〜250℃である。The laminated sheet for a multilayer package of the present invention comprising the above peelable surface layer and the layer in contact with the peelable surface layer is preferably formed by a coextrusion method. That is, at least two types of high-density polyethylene having different melt indexes, such as beads and pellets, are preferably mixed in an extruder and extruded to form a peelable surface layer. At the same time, a layer in contact with the peelable surface layer is also formed by coextrusion, and the laminated sheet for a multilayer package of the present invention is obtained. Here, the temperature at which at least two kinds of high-density polyethylene having different melt indexes are mixed in the extruder is preferably 150 to 300 ° C. Particularly preferably
190 to 250 ° C.

あるいは、メルトインデックスの異なる少なくとも２種
の高密度ポリエチレンから５μｍ以上の剥離性表面層を
成形し、これを剥離性表面層に接する層とラミネートし
て所望の多層包装体用積層シートとすることもできる。
ラミネート加工としては、例えばエキストルージョンラ
ミネート、ホットメルトラミネート、ドライラミネー
ト、ウエットラミネートなどの方法を用いることができ
る。Alternatively, a peelable surface layer having a thickness of 5 μm or more may be formed from at least two kinds of high-density polyethylene having different melt indexes, and the peelable surface layer may be laminated with a layer in contact with the peelable surface layer to obtain a desired laminated sheet for a multilayer package. it can.
As the laminating process, for example, a method such as extrusion laminating, hot melt laminating, dry laminating or wet laminating can be used.

本発明の多層包装体用積層シートは上記のような材料か
らなる２層のものでもよいが、ガスバリヤー性の向上
や、容器とした場合の変形を少なくする目的で、さらに
他の材料からなる層を積層した３層以上の積層シートと
してもよい。他の材料からなる層としては、例えばエチ
レン−ビニルアルコール共重合体、ポリ塩化ビニリデ
ン、ナイロン、ポリエチレンテレフタレートなどの樹脂
層やアルミ蒸着層などのガスバリヤー性に優れたものが
挙げられる。これらの他の材料からなる層は、１層のみ
でもよいし、２層以上からなる多層体であってもよく、
また、無機充填剤10〜80重量％を含有する樹脂層を有す
るものであってもよい。The laminated sheet for a multilayer package of the present invention may be a two-layered one made of the above-mentioned materials, but it is made of another material for the purpose of improving gas barrier properties and reducing deformation when used as a container. It may be a laminated sheet of three or more layers in which layers are laminated. Examples of layers made of other materials include those having excellent gas barrier properties such as resin layers of ethylene-vinyl alcohol copolymer, polyvinylidene chloride, nylon, polyethylene terephthalate and the like, and aluminum vapor deposition layers. The layer composed of these other materials may be only one layer, or may be a multilayer body composed of two or more layers,
Further, it may have a resin layer containing 10 to 80% by weight of an inorganic filler.

本発明はまた、上記の多層包装体用積層シートを熱成形
して得られた開口部とその周縁にフランジ部を有する容
器と該容器のフランジ部のシールされた蓋材とからな
り、該フランジ部のシール部よりも開口部側の表面剥離
層に凹状の弱め線が形成されていることを特徴とする多
層包装体を提供することである。The present invention also comprises a container having an opening obtained by thermoforming the above-mentioned laminated sheet for a multilayer package and a flange portion on the periphery thereof, and a lid member for sealing the flange portion of the container, wherein the flange It is intended to provide a multilayer package in which a concave weakening line is formed in the surface peeling layer on the opening side of the seal portion.

以下、本発明の多層包装体を図面に基づいて詳細に説明
する。第１図（ａ）は本発明の多層包装体の一例を説明
する断面説明図である。Hereinafter, the multilayer package of the present invention will be described in detail with reference to the drawings. FIG. 1 (a) is a cross-sectional explanatory view illustrating an example of the multilayer package of the present invention.

第１図（ａ）において、１は多層容器本体の剥離性表面
層、２はこれに接する層（外層）、３はフランジ部であ
る。容器に内容物を充填したのち蓋材４で蓋をし、この
蓋材を多層容器本体の剥離性表面層１とフランジ部３で
タイトにヒートシールする。５はヒートシール部の位置
を示し、多層容器本体と蓋材は多層容器本体のフランジ
部で難剥離ヒートシールされている。ヒートシール部の
内側端と外側端には剥離性表面層に凹状の弱め線６、７
が形成されている。In FIG. 1 (a), 1 is a peelable surface layer of a multi-layer container body, 2 is a layer (outer layer) in contact therewith, and 3 is a flange portion. After the container is filled with the contents, the container is covered with the lid member 4, and the lid member is tightly heat-sealed with the peelable surface layer 1 of the multilayer container body and the flange portion 3. Reference numeral 5 indicates the position of the heat seal portion, and the multilayer container body and the lid member are heat-seal-resistant with the flange portion of the multilayer container body. A concave weakening line 6, 7 is formed on the peelable surface layer at the inner and outer ends of the heat seal portion.
Are formed.

ヒートシール部外側端の剥離性表面層の凹状の弱め線７
は、開封時に多層容器本体の剥離面すなわち剥離性表面
層とこれに接する層との層間の剥離を容易にするための
もので、多層容器の剥離性表面層の剥離の他の手段で開
始する場合には必ずしも必要ではない。なお外側端に凹
状の弱め線を設ける場合には少なくとも開封開始部に設
ければよい。Concave weakening line 7 of the peelable surface layer on the outer end of the heat seal part
Is for facilitating the peeling between the peeling surface of the multilayer container body, that is, the peelable surface layer and the layer in contact with the peeling surface layer at the time of opening, and is started by other means for peeling the peelable surface layer of the multilayer container. It is not always necessary in some cases. If a concave weakening line is provided at the outer end, it may be provided at least at the opening start portion.

剥離性表面層のヒートシール部の内側端の凹状の弱め線
６は蓋材を剥がす際にフランジ部内周で蓋材とともに剥
離した多層容器本体の剥離性表面層を切断し開封するた
めに必要なものである。この凹状の弱め線は蓋材を剥が
すときに剥離性表面層を容易に切断できるものであれば
どのようなものでもよい。剥離性表面層の剥離性の点か
らは、凹状の弱め線は凹状の先端が多層容器の剥離性表
面層に接する層（外層）まで接していることが好まし
い。この剥離性表面層は、本発明のメルトインデックス
の異なる少なくとも２種の高密度ポリエチレンからなる
厚みは５μｍ以上の層であり、上記の凹状の弱め線での
エッジ切れによるカット性に優れている。The concave weakening line 6 at the inner end of the heat seal portion of the peelable surface layer is necessary for cutting and opening the peelable surface layer of the multilayer container body which is peeled together with the lid material at the inner circumference of the flange when peeling the lid material. It is a thing. The concave weakening line may be any line as long as it can easily cut the peelable surface layer when the lid material is peeled off. From the viewpoint of the releasability of the releasable surface layer, it is preferable that the concave weakening line is in contact with the layer (outer layer) whose concave tip is in contact with the releasable surface layer of the multilayer container. This releasable surface layer is a layer made of at least two kinds of high-density polyethylene having different melt indexes of the present invention and having a thickness of 5 μm or more, and is excellent in cutability due to edge breakage at the above concave weak line.

また、この凹状の弱め線は円、三角形、四角形など環状
にフランジ内周に全周にわたって設けてもよいし、一部
は残しておいてもよい。蓋材の一部がついたまま剥がす
ように場合には、そこの部分だけ凹状の弱め線を設けな
いようにする。Further, the concave weakening line may be provided in a circular shape, a triangular shape, a quadrangular shape, or the like in an annular shape all around the inner circumference of the flange, or a part thereof may be left. When peeling off with the lid partly attached, do not provide concave weakening lines only there.

また、凹状の弱め線が蓋材を介して押圧形成されている
と、製造上工程が簡潔となり好ましい。Further, it is preferable that the concave weakening line is formed by pressing through the lid member, because the manufacturing process is simple.

本発明の多層容器本体の形状は特に限定されるものでは
ないが、通常、円、四角などであり、この形状のフラン
ジ部に沿って蓋材が環状にヒートシールされる。また、
カップ状であっもトレー状であってもよく、フランジ部
周縁にリブまたはカールが設けられているものであって
もよい。The shape of the multilayer container body of the present invention is not particularly limited, but it is usually a circle, a square, or the like, and the lid member is heat-sealed in an annular shape along the flange portion of this shape. Also,
It may be cup-shaped or tray-shaped, and may be provided with ribs or curls around the flange.

次に、蓋材の材料は単層フイルムであっても多層フイル
ムであってもいずれでもよく、特に制限はない。多層フ
イルムを用いた場合について説明すると、プラスチック
の単層フイルム、多層フイルム、紙、アルミ箔又はこれ
らの複合材料等からなる基材と、ポリエチレン、ポリプ
ロピレン、エチレン−α−オレフィン共重合体、エチレ
ン−酢酸ビニル共重合体等からなる多層材料の剥離性表
面層との易ヒートシール性を有する樹脂からなるシーラ
ント層とからなっているものが好適に用いられる。Next, the material for the lid material may be either a single-layer film or a multi-layer film and is not particularly limited. Explaining the case of using a multi-layer film, a plastic single-layer film, a multi-layer film, paper, a base material made of aluminum foil or a composite material thereof, and polyethylene, polypropylene, ethylene-α-olefin copolymer, ethylene- A material comprising a peelable surface layer of a multi-layer material made of a vinyl acetate copolymer and a sealant layer made of a resin having an easy heat-sealing property is preferably used.

なお、本発明の多層包装体にあっては、容器本体に剥離
性表面層を有する本発明の多層包装体用積層シートを有
する限り、多層材料の剥離性表面層の内側に必要に応じ
て、シール層など他の層を有していてもよい。In the multi-layered package of the present invention, as long as it has a laminated sheet for a multi-layered package of the present invention having a peelable surface layer in the container body, if necessary inside the peelable surface layer of the multilayer material, It may have other layers such as a seal layer.

更に本発明は、本発明の多層包装体用積層シートの開口
部とその周縁にフランジ部を有する容器に熱成形し、少
なくとも内側の周縁部に凸状部を有するシールリングを
用いて蓋材を該容器フランジ部にヒートシールすること
を特徴とする多層包装体の製造方法を提供するものであ
る。Furthermore, the present invention is thermoformed into a container having an opening of the laminated sheet for a multilayer package of the present invention and a flange portion on the periphery thereof, and a lid member is formed by using a seal ring having a convex portion on at least the inner periphery. The present invention provides a method for producing a multi-layer package, which comprises heat-sealing the flange portion of the container.

本発明の多層包装体は以下の方法により容易に好適に作
製される。The multilayer package of the present invention can be easily and suitably manufactured by the following method.

本発明の多層包装体用積層シートを真空成形、圧空成形
などにより成形したり、多層射出成形、多層射出ブロー
成形、多層ブロー成形などにより、開口部とのその周縁
にフランジを有する容器に熱成形する。あるいは必要に
応じて紙などの容器の内側に多層フイルムを熱成形する
ことができる。The laminated sheet for a multilayer package of the present invention is formed by vacuum forming, pressure forming, or the like, or by thermoforming into a container having a flange on the periphery of the opening by multi-layer injection molding, multi-layer injection blow molding, multi-layer blow molding, or the like. To do. Alternatively, the multilayer film can be thermoformed inside a container such as paper, if desired.

上記の容器のフランジ部に蓋材を設置して、少なくとも
内側の周縁部に凸状部を有するシールリングを用いて該
蓋材をヒートシールする。A lid member is installed on the flange portion of the container, and the lid member is heat-sealed using a seal ring having a convex portion at least on the inner peripheral edge portion.

第１図（ｂ）は第１図（ａ）に示す多層包装体をヒート
シールするシールリングについて説明する断面説明図で
ある。９はシールリングで、このシールリングを用いて
剥離性表面層を蓋材を介して押圧することにより剥離性
表面層に凹状の弱め線を形成する。FIG. 1 (b) is a cross-sectional explanatory view illustrating a seal ring for heat-sealing the multilayer package shown in FIG. 1 (a). Reference numeral 9 is a seal ring, and a concave weakening line is formed in the peelable surface layer by pressing the peelable surface layer through the lid material using the seal ring.

シールリング９には周縁部に通常10〜500μｍ、好まし
くは20〜300μｍの高さの凸状部10が設けられており、
ヒートシール時にヒートシール部の内側端に、さらには
必要に応じてヒートシール部の外側端に凹状の弱め線を
形成する。ヒートシールリングは、第１図（ｂ）に示す
ように、周縁部に凸状部を有し、ヒートシール部の端部
に剥離性表面層の凹部を形成できるものであれば特に制
限はない。The seal ring 9 is provided with a convex portion 10 having a height of usually 10 to 500 μm, preferably 20 to 300 μm on the peripheral edge,
At the time of heat-sealing, a concave weakening line is formed on the inner end of the heat-sealing portion and, if necessary, on the outer end of the heat-sealing portion. As shown in FIG. 1 (b), the heat seal ring is not particularly limited as long as it has a convex portion at the peripheral edge and can form a recess of the peelable surface layer at the end of the heat seal portion. .

第２図は本発明に用いるヒートシールリングの他の好ま
しい態様を示すものである。ヒートシールリングの内側
周縁部の凸状部に対応する位置近傍の包装体の蓋材及び
剥離性表面層に凹状の弱め線が形成されており、ヒート
シール部の内側端の剥離性表面層の凹状の弱め線から外
側に向かって、通常１〜10mm、好ましくは1.5から5mmの
非ヒートシール部が形成されている。11はこの非ヒート
シール部の位置を示している。FIG. 2 shows another preferred embodiment of the heat seal ring used in the present invention. A concave weakening line is formed in the lid material and peelable surface layer of the package near the position corresponding to the convex portion of the inner peripheral edge of the heat seal ring, and the peelable surface layer of the inner end of the heat seal portion is formed. A non-heat-sealed portion of 1 to 10 mm, preferably 1.5 to 5 mm, is formed outward from the concave weakening line. Reference numeral 11 indicates the position of this non-heat-sealed portion.

第３図は本発明の他の態様を示すもので、多層容器のフ
ランジ部の外側端までヒートシールされ、剥離性表面層
に外側の凹状の弱め線が設けられていない例である。FIG. 3 shows another embodiment of the present invention, which is an example in which the outer end of the flange portion of the multilayer container is heat-sealed and the peelable surface layer is not provided with an outer concave weakening line.

第４図は本発明のヒートシール部の形状の好ましい態様
を示す平面図で、凹状の弱め線は環状にフランジ部全周
にわたって形成されており、つまみ部付近に凸状の先端
部を有しており、開封を一層容易にしている。FIG. 4 is a plan view showing a preferred embodiment of the shape of the heat-sealing portion of the present invention, in which the concave weakening line is formed annularly over the entire circumference of the flange portion and has a convex tip portion near the knob portion. This makes it easier to open.

以上、本発明の多層包装体及び多層包装体の製造方法に
おいて、本発明の多層包装体用積層シートが多層容器本
体に熱成形されている場合について説明したが、本発明
は多層包装体用積層シートを蓋材として用いる場合等シ
ート状のものについても包装体が袋状のものについても
適用できる。As described above, in the multilayer package and the method for producing the multilayer package of the present invention, the case where the multilayer sheet for a multilayer package of the present invention is thermoformed into a multilayer container body has been described. When the sheet is used as the lid material, the sheet-shaped one and the bag-shaped one can be applied.

〔作用〕[Action]

メルトインデックスの異なる少なくとも２種の高密度ポ
リエチレンからなる剥離性表面層では分子量分布に起因
する高密度ポリエチレン間の相分離によりエッジ切れ性
能が改善される一方、前記高密度ポリエチレンと同一メ
ルトインデックスを有する単一高密度ポリエチレンでは
当該性能が現れないものと推定される。In the peelable surface layer composed of at least two kinds of high-density polyethylene having different melt indexes, edge separation performance is improved by phase separation between the high-density polyethylene due to the molecular weight distribution, while having the same melt index as the high-density polyethylene. It is presumed that the performance does not appear in single high density polyethylene.

本発明の多層包装体に商品を封入し、蓋材をヒートシー
ルしたものを開封するときは以下のような動作で簡単に
開封することができる。When a product is enclosed in the multilayer package of the present invention and the lid member is heat-sealed, it can be easily opened by the following operation.

例えば、第１図（ａ）において、つまみ部８を上方にも
ちあげる。すると、剥離性表面層の凹状の弱め線７のと
ころから剥離性表面層１とそれに接する層２との層間で
剥離が開始され、それに続いてヒートシール部外縁の剥
離性表面層の凹状の弱め線７が切断され、それにつれて
剥離性表面層１とこれに接する層２の間で剥離が進行
し、剥離性表面層の凹状の弱め線６のところまで剥離性
表面層が剥離し、弱め線６でのエッジ切れにより蓋材が
剥がされる。本発明の多層包装体用積層シートを用いる
ことによりこのときのエッジ切れによるカット性が優れ
ているので、蓋材と多層包装容器とが密封性よく難剥離
ヒートシールされていても容易に開封できる。また、開
封したあとの剥離面の外観も美麗である。For example, in FIG. 1 (a), the knob portion 8 is lifted upward. Then, peeling is started between the peelable surface layer 1 and the layer 2 in contact therewith from the concave weakening line 7 of the peelable surface layer, and subsequently, the concave weakening of the peelable surface layer at the outer edge of the heat seal portion is started. The line 7 is cut, the peeling progresses between the peelable surface layer 1 and the layer 2 in contact therewith, and the peelable surface layer peels up to the concave weakening line 6 of the peelable surface layer. The edge material at 6 cuts off the lid material. By using the laminated sheet for a multilayer package of the present invention, the cutting property due to edge breakage at this time is excellent, so that the lid material and the multilayer packaging container can be easily opened even if they are difficultly peeled and heat-sealed. . The appearance of the peeled surface after opening is also beautiful.

〔実施例〕〔Example〕

次に実施例により本発明をさらに詳細に説明するが、本
発明はこれらの例によってなんら限定されるものではな
い。Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

実施例１〜８及び比較例１〜７ 第１表に示すメルトインデックス（MI）を有し、第１表
に示す配合比のペレット状の高密度ポリエチレンのベー
スレジンと配合物とを押出機に入れた（第２表に使用し
た樹脂の特性、商品名等を示す。）。これを230℃で混
合しながら、これが剥離性表面層となるように共押出成
形によりこの剥離性表面層（Ａ層）とこれに接する層
（Ｂ層）の２層から多層包装体用積層シートを成形し
た。ここで、Ａ層の厚みは３〜150μｍで第１表に示す
厚みとした。また、Ｂ層の厚みは800μｍとし、材料は
Ｅ−100G/ペトロセン172＝80/20重量％とした。Examples 1 to 8 and Comparative Examples 1 to 7 A pellet-shaped high-density polyethylene base resin having a melt ratio (MI) shown in Table 1 and a blending ratio shown in Table 1 and a blended product were placed in an extruder. (The characteristics of the resin used, the trade name, etc. are shown in Table 2.) While being mixed at 230 ° C., from the two layers of the peelable surface layer (A layer) and the layer (B layer) in contact with the peelable surface layer (A layer) by coextrusion so as to form the peelable surface layer, a laminated sheet for a multilayer package. Was molded. Here, the thickness of the layer A was 3 to 150 μm and the thickness shown in Table 1 was used. The thickness of the B layer was 800 μm, and the material was E-100G / Petrosene 172 = 80/20 wt%.

この多層包装体用積層シートを真空、圧空成形により、
60mmφ×40mm（高さ）のフランジ付（フランジ幅8mm）
の丸型多層容器を成形した。This laminated sheet for multilayer packaging is vacuum and pressure formed,
With 60 mmφ x 40 mm (height) flange (flange width 8 mm)
The round-shaped multi-layered container was molded.

この容器に蓋材として、配向ナイロン／ポリ塩化ビニリ
デン／直鎖状低密度ポリエチレン（15μ/20μ/60μ）か
らなる多層フイルムをかぶせ、フランジ部でヒートシー
ルリングを用い温度170℃、圧力5kg/cm2、１秒でヒート
シールを行った。なお、ヒートシールリングはシリンダ
ー径80mmφであり、その内周縁の直径は63mmφ、ヒート
シール部幅は10mmであり、シールリングの内周縁部に
は、50μｍの環状の凸状部が設けられており、ヒートシ
ールはフランジ部の外側端まで行った（第３図）。ヒー
トシールにより得られた凹状の弱め線の内側端での剥離
性表面層の厚みは実質ゼロであった。This container is covered with a multilayer film made of oriented nylon / polyvinylidene chloride / linear low-density polyethylene (15μ / 20μ / 60μ), and a heat seal ring is used at the flange temperature 170 ° C, pressure 5kg / cm. 2. Heat sealing was performed in 1 second. The heat seal ring has a cylinder diameter of 80 mmφ, the inner peripheral edge has a diameter of 63 mmφ, the heat seal portion width is 10 mm, and the inner peripheral edge portion of the seal ring is provided with an annular convex portion of 50 μm. Heat sealing was performed up to the outer end of the flange portion (Fig. 3). The thickness of the peelable surface layer at the inner end of the concave weakening line obtained by heat sealing was substantially zero.

このようにして得られた密封容器について、蓋材を剥離
したときのカット性、耐圧性、シール性、耐レトルト性
（120℃、30分）について各々評価を行った結果を第１
表に示す。The sealed container thus obtained was evaluated for cutability, pressure resistance, sealability, and retort resistance (120 ° C., 30 minutes) when the lid material was peeled off.
Shown in the table.

〔発明の効果〕 本発明により、開封が容易に行え剥離時のカット性に優
れ剥離面の外観が良好な、シール強度が高く密封性に優
れたボイルやレトルト処理が可能である多層包装体及び
その多層包装体用積層シートを得ることができる。ま
た、その多層包装体を容易に広いシール条件範囲で製造
することの可能な多層包装体の製造方法を得ることがで
きる。 (Effects of the Invention) According to the present invention, a multilayer package which can be easily opened and has excellent cuttability at the time of peeling, has a good appearance of the peeling surface, and has a high seal strength and excellent sealability that can be subjected to boiling or retort treatment, and The laminated sheet for a multilayer package can be obtained. Further, it is possible to obtain a method for producing a multi-layered package which allows the multi-layered package to be easily produced under a wide range of sealing conditions.

【図面の簡単な説明】[Brief description of drawings]

第１図（ａ）は本発明の多層包装体の一例を示し、第１
図（ｂ）は第１図（ａ）の包装体のヒートシールを行う
シールリングを示す断面説明図、第２図および第３図は
本発明の多層包装体及びシールリングの他の例を示す部
分断面図、第４図は、ヒートシール部のこのましい形状
を示す平面図である。 符号の説明 １……剥離性表面層 ２……剥離性表面層に接する層 ３……フランジ部、４……蓋材 ５……ヒートシール部、６……凹状の弱め線 ７……凹状の弱め線、８……つまみ部 ９……シールリング、10……凸状部FIG. 1 (a) shows an example of the multilayer package of the present invention.
FIG. 2B is a sectional explanatory view showing a seal ring for heat-sealing the package of FIG. 1A, and FIGS. 2 and 3 show other examples of the multilayer package and the seal ring of the present invention. Partial cross-sectional view and FIG. 4 are plan views showing the preferable shape of the heat seal portion. Explanation of symbols 1 ... Releasable surface layer 2 ... Layer in contact with the releasable surface layer 3 ... Flange portion, 4 ... Lid material 5 ... Heat seal portion, 6 ... Recessed weak line 7 ... Recessed Line of weakness, 8 ... Knob, 9 ... Seal ring, 10 ... Convex

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】少なくとも剥離性表面層とこれに接する層
とからなり、該剥離性表面層がメルトインデックスの異
なる少なくとも２種の高密度ポリエチレンからなる厚み
５μｍ以上の層であることを特徴とする多層包装体用積
層シート。1. A peelable surface layer and a layer in contact with the peelable surface layer, wherein the peelable surface layer is a layer having a thickness of 5 μm or more and made of at least two kinds of high-density polyethylene having different melt indexes. Laminated sheet for multilayer packaging. 【請求項２】メルトインデックスの異なる少なくとも２
種の高密度ポリエチレンが、メルトインデックスの差が
２以上のものである請求項１記載の多層包装体用積層シ
ート。2. At least two having different melt indexes.
The laminated sheet for a multilayer package according to claim 1, wherein the high-density polyethylene of the type has a difference in melt index of 2 or more. 【請求項３】請求項１記載の多層包装体用積層シートを
熱成形して得られた開口部とその周縁にフランジ部を有
する容器と該容器のフランジ部にシールされた蓋材とか
らなり、該フランジ部のシール部よりも開口部側の表面
剥離層に凹状の弱め線が形成されていることを特徴とす
る多層包装体。3. A container comprising an opening obtained by thermoforming the laminated sheet for a multilayer package according to claim 1, a flange having a flange portion at its periphery, and a lid member sealed to the flange portion of the container. A multi-layered package in which a concave weakening line is formed in the surface peeling layer on the opening side of the flange of the seal. 【請求項４】弱め線が蓋材を介して押圧形成されたもの
である請求項３記載の多層包装体。4. The multilayer package according to claim 3, wherein the weakening line is formed by pressing through a lid member. 【請求項５】請求項１記載の多層包装体用積層シートを
開口部とその周縁にフランジ部を有する容器に熱成形
し、少なくとも内側の周縁部に凸状部を有するシールリ
ングを用いて蓋材を該容器フランジ部にヒートシールす
ることを特徴とする多層包装体の製造方法。5. The laminated sheet for a multilayer package according to claim 1 is thermoformed into a container having an opening and a flange portion at its periphery, and a lid is provided by using a seal ring having a convex portion at least on the inner periphery. A method for manufacturing a multilayer package, comprising heat-sealing a material to the flange portion of the container.
JP24520789A 1989-09-22 1989-09-22 Laminated sheet for multilayer package, multilayer package, and method for producing multilayer package Expired - Lifetime JPH0694209B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24520789A JPH0694209B2 (en) 1989-09-22 1989-09-22 Laminated sheet for multilayer package, multilayer package, and method for producing multilayer package

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24520789A JPH0694209B2 (en) 1989-09-22 1989-09-22 Laminated sheet for multilayer package, multilayer package, and method for producing multilayer package

Publications (2)

Publication Number Publication Date
JPH03108539A JPH03108539A (en) 1991-05-08
JPH0694209B2 true JPH0694209B2 (en) 1994-11-24

Family

ID=17130220

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24520789A Expired - Lifetime JPH0694209B2 (en) 1989-09-22 1989-09-22 Laminated sheet for multilayer package, multilayer package, and method for producing multilayer package

Country Status (1)

Country Link
JP (1) JPH0694209B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2561865Y2 (en) * 1991-08-05 1998-02-04 大日本印刷株式会社 Vacuum packaging bag
JP2014198575A (en) * 2013-03-29 2014-10-23 出光ユニテック株式会社 Container body, container, molding method, and molding machine
CN110254010B (en) * 2019-06-19 2021-05-04 深圳市一凡环保新材料科技有限公司 Multilayer high-strength flexible composite material and preparation method thereof

Also Published As

Publication number Publication date
JPH03108539A (en) 1991-05-08

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