JPH03108539A - Laminated sheet for multilayer package, multilayer package and manufacture of multilayer package - Google Patents

Laminated sheet for multilayer package, multilayer package and manufacture of multilayer package

Info

Publication number
JPH03108539A
JPH03108539A JP1245207A JP24520789A JPH03108539A JP H03108539 A JPH03108539 A JP H03108539A JP 1245207 A JP1245207 A JP 1245207A JP 24520789 A JP24520789 A JP 24520789A JP H03108539 A JPH03108539 A JP H03108539A
Authority
JP
Japan
Prior art keywords
layer
multilayer
surface layer
laminated sheet
container
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.)
Granted
Application number
JP1245207A
Other languages
Japanese (ja)
Other versions
JPH0694209B2 (en
Inventor
Yukio Takada
高田　幸夫
Takeshi Shinohara
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)
  • Packages (AREA)
  • Laminated Bodies (AREA)
  • Closing Of Containers (AREA)

Abstract

PURPOSE:To improve cutting properties by edge cutting by forming a sealing layer by using at least two kinds of high-density polyethylene having different melt indices as a releasable surface layer. CONSTITUTION:A sheet is composed of a releasable surface layer 1 and a layer 2 brought into contact with the layer 1, and the releasable surface layer 2 is formed in a layer consisting of at least two kinds of high-density polyethylene having,different melt indices and having thickness of 5mum or more. Accordingly, a multilayer package, which is unsealed easily, which has excellent cutting properties at the time of peeling, the superior appearance of a peeling surface, high sealing strength and surpassing sealing properties and which can be boiled and retort-treated, and the laminated sheet for the multilayer package can be acquired.

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
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] 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 manufacturing the multilayer package. More specifically, the present invention relates to a multilayer package with excellent sealability and unsealability, which is suitably used for packaging foods, beverages, etc., particularly for heat sterilization packaging, and a laminated sheet for the multilayer package. The invention also relates to a preferred method for manufacturing the multilayer packaging.

しかし、これらの容器では未だ容器本体の最内層の切断
時のエツ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
が発生しピール惑に劣り、外観上からも好ましいものと
はいえないという問題がある。However, these containers still have insufficient edge-cutting characteristics when cutting the innermost layer of the container body, and may not be able to cut or cut evenly, causing the innermost layer of the container body to stretch, causing hairs, etc., and peeling. There is a problem that it is inferior in appearance and is not desirable in terms of appearance.

〔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。Conventionally, in the field of lightweight containers for packaging foods and the like, various types of easy-to-open containers have been proposed that have excellent sealing properties and are also excellent in opening properties.

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
薄肉部でエツ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６４−７０３７４号
公報）。For example, if the container body has a laminated structure and the lid material is heat-sealed, when the container is opened, the innermost layer on the container body side heat-sealed to the lid material and the layer in contact with it are separated, and the innermost layer An easy-to-open container has been proposed in which the thin-walled portion provided inside the heat-sealed portion is cut with an edge cut (Japanese Patent Laid-Open No. 63-307073, Japanese Utility Model Application No. 64-39273, Japanese Patent Laid-open No. 64-39273, Japanese Unexamined Utility Model Publication No. 64-39273, 70374).

〔発明が解決しようとする課題〕 エツジ切れ特性を改良するための一般法としてエツジ切
れさせる層にポリエチレンワックス、アククチツクポリ
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。[Problems to be Solved by the Invention] A general method for improving the edge cutting property is to add a low molecular weight component such as polyethylene wax or acidic polypropylene to the edge cutting layer. When applied to containers, problems arise such as elution of low molecular weight components and deterioration of the layer during boiling retort, and poor resistance to contents 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ツジ
切れさせて開封する多層包装体容器で、そのシール層の
エツ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, the present invention provides a concave weakened line in the sealing layer of a container whose lid is heat-sealed, and sets the sealing surface and the peeling surface as different surfaces, so that the peeled sealing layer is cut at the edge of the weakened line when opening the package. To provide a multilayer package container that can be sterilized by boiling retort, which has a perfect seal and is easy to open by improving the cuttability of the seal layer due to edge breakage, and a laminated sheet for the multilayer package. It is something. The present invention also seeks to provide a suitable method for manufacturing the multilayer package.

〔課題を解決するための手段〕[Means to solve the problem]

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、エツ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 research to solve the above problems, and have found that by forming the seal layer as a releasable surface layer using at least two types of high-density polyethylene with different melt indexes, the seal layer can be easily cut due to edge breakage. The present invention has been completed based on the discovery that this improves the performance of the present invention.

すなわち本発明は、少な（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 consists of a peelable surface layer and a layer in contact with it, and the peelable surface layer is a layer having a thickness of 5 μm or more and made of at least two types of high-density polyethylene having different melt indexes. The present invention provides a laminated sheet for a multilayer package.

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 multilayer packaging of the present invention comprises at least a releasable surface layer and a layer in contact with the releasable surface layer.

剥離性表面層の厚みは、５〜１５０μｍが好ましい、特
に好ましくは８〜１１００ｕであり、更に好ましくは８
〜５０μｍ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
とエツジ切れを起こさせるための凹状の弱め線形成によ
る核層の薄肉化が不良となる。The thickness of the peelable surface layer is preferably 5 to 150 μm, particularly preferably 8 to 1100 μm, and even more preferably 8 μm.
~50 μm. If the thickness is less than 5 μm, the sealing force will be insufficient when used in a multilayer package, and if it exceeds 150 μm, the thinning of the core layer due to the formation of concave lines of weakness to cause edge breakage will be poor.

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。This releasable surface layer is made of at least two types of high-density polyethylene with different melt indexes, and the melt index of the releasable surface layer is not particularly limited as long as it is between 0.01 and 30. Although it is preferable to set the number of types to two, it is also possible to exceed two types.

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
ツ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　　Ｋ−７２１０に規定され
る条件（１９０℃、２．１６ｋｇ荷重、１０分間）で測
定した。When the number of high-density polyethylenes is two, it is preferable that the difference in melt index between the two is two or more. Particularly preferably, it is 4 or more. When this difference is less than 2, cutting performance due to edge breakage is insufficient. Here, the melt index value was measured under the conditions specified in JIs K-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ツジ切れによる
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ｏ、ｏｉ〜３０の間と
なるようにすることが好ましい。The blending ratio of two types of high-density polyethylene with different melt indexes is preferably 5:95 to 95:5 by weight, particularly preferably high-density polyethylene with a high melt index: high-density polyethylene with a low melt index. The time is 20:80 to 80:20. Outside this range, the releasable surface layer obtained will have insufficient cuttability due to edge breakage. It is preferable to use high-density polyethylene with a melt index difference of 2 or more in the above compounding ratio so that the resulting peelable surface layer has a melt index of between o and oi and 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、その場合には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 laminated sheet for multilayer packaging of the present invention is preferably formed by coextrusion, but in that case, the proportion of high-density polyethylene with a small melt index is higher than the proportion of high-density polyethylene with a large melt index. ,
Stable and desirable.

剥離性表面層に接する層は、上記の眉間剥離強度の条件
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 conditions for the above-mentioned eyebrow peel strength, and may be polyolefin resin, polystyrene resin, polyamide resin, polyester resin, polycarbonate resin, or any of these resins. or a resin or metal foil in which a thermoplastic elastomer, various additives, or inorganic fillers are mixed in an amount of 5 to 70% by weight.

剥離性表面層とこれに接する層との眉間は、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眉間の剥
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／１５ｎｍ（引張速度３００■／
ｍｉｎ、以下同じ）であり、特に好ましくは３００〜１
２００ｇ／１５ｍｍ程度である。The glabella between the peelable surface layer and the layer in contact with it becomes the peeling surface when the package is opened when the laminated sheet for a multilayer package is thermoformed into a container body and the lid material is heat-sealed to form a multilayer package. Therefore, the peel strength between the eyebrows between the peelable surface layer and the layer in contact with it is smaller than the sealing surface, that is, the heat seal strength between the lid material and the peelable surface layer, and when the lid material is peeled off, the peeling surface does not peel off. The strength range is such that the opening of the lid material is easy. There is no particular restriction as long as it is within the above range, but preferably 200 to 1500g/15nm (tensile speed 300g/15nm)
min, hereinafter the same), particularly preferably 300 to 1
It is about 200g/15mm.

包装体の使用分野によって適宜決定すればよい。It may be determined as appropriate 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″Ｃが好ましい。特に好
ましくは１９０〜２５０℃である。The laminate sheet for a multilayer package of the present invention, which is composed of the above-described releasable surface layer and a layer in contact with the releasable surface layer, is suitably formed by a coextrusion method. That is, at least two kinds of bead-shaped, pellet-shaped, etc. high-density polyethylenes having different melt indexes are preferably mixed in an extruder and extruded to form a releasable surface layer. At the same time, a layer in contact with this releasable surface layer is also formed by coextrusion, resulting in a laminated sheet for a multilayer package of the present invention. Here, the temperature at which at least two kinds of high density polyethylenes 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。Alternatively, a peelable surface layer of 5 μm or more may be formed from at least two types of high-density polyethylene with different melt indexes, and this may be laminated with a layer in contact with the peelable surface layer to form a desired laminated sheet for multilayer packaging. can.

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
、ウェットラミネートなどの方法を用いることができる
。As the lamination process, methods such as extrusion lamination, hot melt lamination, dry lamination, and wet lamination 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−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−性に優れたものが挙げ
られる。これら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 multilayer packaging of the present invention may be a two-layer sheet made of the above-mentioned materials, but for the purpose of improving gas barrier properties and reducing deformation when used as a container, it may be made of other materials. A laminate sheet having three or more layers may also be used. Examples of layers made of other materials include ethylene-vinyl alcohol copolymer, polyvinylidene chloride,
Examples include resin layers such as nylon and polyethylene terephthalate, and materials with excellent gas barrier properties such as aluminum vapor-deposited layers. The layer made of these other materials may be only one layer, or may be a multilayer body consisting of two or more layers, and
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
包装体を提供することである。The present invention also provides a container comprising an opening obtained by thermoforming the above laminated sheet for multilayer packaging and a flange on the periphery of the opening, and a lid sealed to the flange of the container. To provide a multilayer package characterized in that a concave line of weakness is formed in a surface peeling layer on the side closer to the opening than the seal part of the package.

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 explained in detail based on the drawings. FIG. 1(a) is an explanatory cross-sectional view illustrating an example of the multilayer packaging body of the present invention.

第１図（ａ）において、ｌは多層容器本体の剥離性表面
層、２はこれに接する層（外Ｎ）、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), l is the peelable surface layer of the multilayer container body, 2 is the layer in contact with this (outer N), and 3 is the flange portion. After the container is filled with contents, it is covered with a lid material 4, and this lid material is tightly heat-sealed between the peelable surface layer 1 of the multilayer container body and the flange portion 3. 5 indicates the position of the heat-sealed portion, and the multilayer container main body and the lid material are heat-sealed with difficulty in peeling at the flange portion of the multilayer container main body. There are concave weakened lines 6.7 in the peelable surface layer at the inner and outer edges of the heat-sealed part.
is 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眉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を他の手段で開
始する場合には必ずしも必要ではない。なお外側端に凹
状の弱め腺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 weakened line 7 of the peelable surface layer at the outer edge of the heat-sealed part
This is to facilitate the peeling between the peelable surface of the multilayer container main body, that is, the peelable surface layer, and the layer in contact with this when opening the container, and the peeling of the peelable surface layer of the multilayer container is initiated by other means. It is not always necessary in some cases. If a concave weakening gland 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
ツジ切れによるカット性に優れている。The concave line of weakening 6 at the inner end of the heat-sealed part of the peelable surface layer is necessary for cutting and opening the peelable surface layer of the multilayer container main body that has been peeled off along with the lid material at the inner periphery of the flange when the lid material is peeled off. It is something. This concave line of weakening may be of any type as long as it can easily cut the releasable 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 tip of the recessed line of weakness is in contact with the layer (outer layer) that is in contact with the releasable surface layer of the multilayer container. This releasable surface layer is a layer having a thickness of 5 μm or more and made of at least two types of high-density polyethylene having different melt indexes according to the present invention, and is excellent in cuttability due to edge breakage at the above-mentioned concave line of weakness.

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０Ｍ材の一部がついたまま剥がす
ような場合には、そこの部分だけ凹状の弱め線を設けな
いようにする。In addition, this concave weakening line may be provided in an annular shape such as a circle, triangle, or square around the entire periphery of the flange, or it may be peeled off with a part of the 0M material still attached. In such cases, avoid providing concave lines of weakness only in those areas.

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 line of weakening is formed by pressing through the lid material, since this simplifies the manufacturing process.

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。Although the shape of the multilayer container body of the present invention is not particularly limited, it is usually circular, square, etc., and the lid material 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 have ribs or curls on the periphery of the flange portion.

次に、蓋材の材料は単層フィルムであっても多層フィル
ムであってもいずれでもよく、特に制限はない。多層フ
ィルムを用いた場合について説明すると、プラスチック
の単層フィルム、多層フィルム、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 of the lid material may be either a single layer film or a multilayer film, and is not particularly limited. To explain the case of using a multilayer film, a base material made of a plastic single-layer film, multilayer film, paper, aluminum foil, or a composite material thereof, and a base material such as polyethylene, polypropylene, ethylene-α-olefin copolymer, ethylene- A material comprising a peelable surface layer made of a multilayer material such as a vinyl acetate copolymer and a sealant layer made of a resin having easy heat-sealability 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
性表面層を存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 addition, in the multilayer packaging of the present invention, as long as the container body has the laminated sheet for multilayer packaging of the present invention having a peelable surface layer, the inside of the peelable surface layer of the multilayer material may contain, if necessary, It may also have other layers such as a sealing layer.

更に本発明は、本発明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を提供するものであ
る。Furthermore, the present invention thermoforms the laminated sheet for multilayer packaging of the present invention into a container having an opening and a flange on the periphery thereof, and seals the lid by using a seal ring having a convex portion on at least the inner periphery. The present invention provides a method for manufacturing a multilayer package, which is characterized by heat sealing the container flange.

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 produced 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、多層射出プロー
成形、多層ブロー成形などにより、開口部とその周縁に
フランジ部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ィルムを熱成形する
ことができる。The laminated sheet for multilayer packaging of the present invention is molded by vacuum forming, pressure forming, etc., or thermoformed into a container having an opening and a flange around the periphery by multilayer injection molding, multilayer injection blow molding, multilayer blow molding, etc. do. Alternatively, the multilayer film can be thermoformed on the inside of 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（とも
内側の周縁部に凸状部を存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 material is placed on the flange portion of the container, and the lid material is heat-sealed using a seal ring having a convex portion on the inner peripheral edge.

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 diagram illustrating a seal ring for heat-sealing the multilayer package shown in FIG. 1(a). Reference numeral 9 denotes a seal ring, which is used to press the releasable surface layer through the lid material to form a concave weakened line in the releasable surface layer.

シールリング９には周縁部に通常１０〜５００μｍ１好
ましくは２０〜３００ｔＩｍ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。The seal ring 9 is provided with a convex portion 10 having a height of usually 10 to 500 μm, preferably 20 to 300 tIm, on the peripheral edge, and the convex portion 10 has a height of 10 to 500 μm, preferably 20 to 300 tIm. Form a concave line of weakness at the outer edge of the section.

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 heat seal ring is not particularly limited as long as it has a convex portion on the periphery and can form a concave portion of the releasable surface layer at the end of the heat seal portion, as shown in FIG. 1(b). .

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〜工０ａＩａｌ、好ましくは１．
５から５１１ｍの非ヒートシール部が形成されている。FIG. 2 shows another preferred embodiment of the heat seal ring used in the present invention. A concave line of weakness is formed in the lid material and the peelable surface layer of the package in the vicinity of the position corresponding to the convex part on the inner peripheral edge of the heat seal ring, and From the concave weakened line outward, it is usually 1 to 0, preferably 1.
A non-heat-sealed portion of 5 to 511 m is formed.

１１はこの非ヒートシール部の位置を示している。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, in which the flange of the multilayer container is heat-sealed to the outer edge, and the releasable surface layer is not provided with an outer concave weakened 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-sealed portion of the present invention, in which the concave line of weakness is formed in an annular shape over the entire periphery of the flange portion, and has a convex tip near the knob portion. This makes opening even easier.

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。Above, in the multilayer packaging body and the method for manufacturing a multilayer packaging body of the present invention, the case where the laminated sheet for a multilayer packaging body of the present invention is thermoformed into a multilayer container main body has been described. It can be applied to both sheet-shaped items such as when the sheet is used as a lid material, and bag-shaped packages.

〔作用〕[Effect]

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ツジ切れ性
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 a peelable surface layer made of at least two types of high-density polyethylene with different melt indexes, the edge cutting performance is improved due to phase separation between the high-density polyethylenes due to molecular weight distribution, while the peelable surface layer has the same melt index as the high-density polyethylene. It is presumed that this performance will not appear with a 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 a lid material is heat-sealed, the package can be easily opened by the following operations.

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との眉間で
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Ｎ１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ｖＡ６のところまで剥離性
表面層が剥離し、弱め線６でのエツ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ツ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 8 is lifted upward. Then, peeling starts from the concave weakening line 7 of the releasable surface layer between the eyebrows of the releasable surface layer 1 and the layer 2 in contact with it, and then the concave weakening line of the releasable surface layer at the outer edge of the heat-sealed part begins to peel off. As the line 7 is cut, peeling progresses between the peelable surface N1 and the layer 2 in contact with it, and the peelable surface layer peels off to the concave weakening vA6 of the peelable surface layer. The cover material is peeled off due to the edge breaking. By using the laminated sheet for multilayer packaging of the present invention, the cutting ability due to edge breakage is excellent, so even if the lid material and the multilayer packaging container are heat-sealed with good sealing properties and are difficult to peel off, they can be easily opened. . Moreover, the appearance of the peeled surface after opening is also beautiful.

〔実施例］ 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。[Examples] Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples in any way.

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（Ｍ　Ｉ　）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２３
０℃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層からなる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％とじた。Examples 1 to 8 and Comparative Examples 1 to 7 have the melt index (M I ) shown in Table 1,
Pellet-shaped high-density polyethylene base resin and the compound having the compounding ratio shown in Table 1 were placed in an extruder (Table 2 shows the characteristics, product name, etc. of the resin used). This is 23
While mixing at 0°C, a laminated sheet for multilayer packaging consisting of two layers, the peelable surface layer (layer A) and the layer in contact with it (layer B), is formed by coextrusion molding so that this forms a peelable surface layer. Molded. Here, the thickness of layer A was 3 to 150 μm, as shown in Table 1. In addition, the thickness of layer B is 800 μm
The material is E-100G/Petrocene 172=80/
It was bound at 20% by weight.

この多層包装体用積層シートを真空、圧空成形により、
６０ｗφＸ４０ｍｍ（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 formed by vacuum and pressure forming.
A round multilayer container with a flange (flange width 8 mm) measuring 60 wφ x 40 mm (height) 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／２０μ７６
０μ）からなる多層フィルムをかぶせ、フランジ部でヒ
ートシールリングを用い温度１７０　’Ｃ１圧力５ｋｇ
／ｃｄ、　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８０閣φであり、その内周
縁の直径は６３ｍｍ、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。As a lid material for this container, oriented nylon/polyvinylidene chloride/linear low density polyethylene (15μ/20μ76
Cover with a multilayer film consisting of 0μ), and use a heat seal ring at the flange at a temperature of 170'C1 and a pressure of 5kg.
/cd, heat sealing was performed for 1 second. The heat seal ring has a cylinder diameter of 80 mm, the diameter of its inner periphery is 63 mm, the width of the heat seal part is 10 mm, and a 50 μm annular convex portion is provided on the inner periphery of the seal ring. The thickness of the releasable surface layer at the inner end of the concave line of weakness 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＃本訃
レトルト性（１２０°Ｃ１３０分）につい３字ｎて各々
評価を行った結果を第１表に示す。The sealed containers obtained in this way were evaluated using the following three criteria: cutting performance when the lid material was peeled off, pressure resistance, sealing performance, and retortability (120°C for 130 minutes). The results are shown in Table 1.

（以下余白） 〔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、シール強度が斉く密封性に優
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。(The following is a blank space) [Effects of the Invention] The present invention enables boiling and retort processing that can be easily opened, has excellent cutting properties during peeling, has a good appearance on the peeled surface, has uniform seal strength, and has excellent sealing properties. A certain multilayer package and a laminated sheet for the multilayer package can be obtained. Furthermore, it is possible to obtain a method for manufacturing a multilayer package that allows the multilayer package to be easily manufactured under a wide range of sealing conditions.

【図面の簡単な説明】[Brief explanation 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（ハ）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　Ｍ材 ヒートシール部　　６　凹状の弱め線 凹状の弱め線　　　８　つまみ部 シールリング　　　ｌＯ凸状部 毛１図FIG. 1(a) shows an example of the multilayer packaging body of the present invention.
Figure (c) is a cross-sectional explanatory diagram showing a seal ring for heat-sealing the package shown in Figure 1 (a), and Figures 2 and 3 show other examples of the multilayer package and seal ring of the present invention. The partial cross-sectional view, FIG. 4, is a plan view showing a preferred shape of the heat-sealed portion. Explanation of symbols 1 Peelable surface layer 2 Layer in contact with the peelable surface layer 3 Flange portion 4 M material heat-sealed portion 6 Concave line of weakness Concave line of weakness 8 Knob seal ring 1O convex hair 1

Claims (1)

【特許請求の範囲】 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
。 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。 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。 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。 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。[Scope of Claims] 1. Consisting of at least a releasable surface layer and a layer in contact with the releasable surface layer, the releasable surface layer is a layer having a thickness of 5 μm or more and consisting of at least two types of high-density polyethylene having different melt indexes. Features: Laminated sheet for multilayer packaging. 2. The laminated sheet for multilayer packaging according to claim 1, wherein the at least two kinds of high-density polyethylenes having different melt indexes have a difference of 2 or more in melt index. 3. Consisting of a container obtained by thermoforming the laminated sheet for multilayer packaging according to claim 1 and having an opening and a flange around the periphery thereof, and a lid sealed to the flange of the container,
A multilayer packaging body characterized in that a concave line of weakness is formed in the surface peeling layer on the side closer to the opening than the seal part of the flange part. 4. The multilayer package according to claim 3, wherein the line of weakness is formed by pressing through the lid material. 5. The laminated sheet for multilayer packaging according to claim 1 is thermoformed into a container having an opening and a flange on the periphery thereof, and a sealing ring having a convex portion on at least the inner periphery is used to seal the lid. A method for producing a multilayer package, characterized by heat-sealing a container flange.
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 true JPH03108539A (en) 1991-05-08
JPH0694209B2 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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0516642U (en) * 1991-08-05 1993-03-02 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
CN110254010A (en) * 2019-06-19 2019-09-20 泉州市康馨化工科技有限公司 A kind of multiple layers of high strength flexible composite and preparation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0516642U (en) * 1991-08-05 1993-03-02 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
CN110254010A (en) * 2019-06-19 2019-09-20 泉州市康馨化工科技有限公司 A kind of multiple layers of high strength flexible composite and preparation method thereof
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
JPH0694209B2 (en) 1994-11-24

Similar Documents

Publication Publication Date Title
US5281453A (en) Multilayer composites and easily openable containers
JPH0457760A (en) Easy openable container and manufacture thereof
JPS62251363A (en) Simple beer vessel
JP2965825B2 (en) Multilayer structure and easy-open container
JP4270621B2 (en) Retort injection molded container
JP4220044B2 (en) Injection mold container for microwave oven
JP3950509B2 (en) Multi-layer sheet and container
JPH03108539A (en) Laminated sheet for multilayer package, multilayer package and manufacture of multilayer package
JPH01182269A (en) Easy-opening sealed container
JPH0567508B2 (en)
JP2575709B2 (en) Easy-open sealable container and method for producing the same
JP6006608B2 (en) Laminated sheets, processed products, containers and packaging containers
JP2001310431A5 (en)
JP3966947B2 (en) Easy-open sealed container and method for manufacturing the same
JP2769564B2 (en) Multilayer structure and easy-open container
JP3157279B2 (en) Plastic lid
JP2007099324A (en) Deep drawing formed vessel and packaging body using the same
JPH04144744A (en) Multilayer structure and easy-to-open vessel
JPH1086296A (en) Multilayered sheet and easily openable container
JPS63307073A (en) Easy-openable package and production thereof
JP3780075B2 (en) Easy-open composite film for heat-resistant containers
JPH0143225Y2 (en)
JPS6396063A (en) Easily unsealable vessel
JP2571569B2 (en) Easy-open sealed container with drop lid for container
JP2590337B2 (en) Multilayer container for multi-layer container thermoforming

Legal Events

Date Code Title Description
S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313111

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20071124

Year of fee payment: 13

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081124

Year of fee payment: 14

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081124

Year of fee payment: 14

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20091124

Year of fee payment: 15

EXPY Cancellation because of completion of term