JP3826957B2 - 衛生用品用の個装袋の製造方法、及びその方法により得られる個装袋 - Google Patents

衛生用品用の個装袋の製造方法、及びその方法により得られる個装袋 Download PDF

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JP3826957B2
JP3826957B2 JP23893594A JP23893594A JP3826957B2 JP 3826957 B2 JP3826957 B2 JP 3826957B2 JP 23893594 A JP23893594 A JP 23893594A JP 23893594 A JP23893594 A JP 23893594A JP 3826957 B2 JP3826957 B2 JP 3826957B2
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JPH08103463A (ja
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和仁 後藤
正章 荒川
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Nitto Denko Corp
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Nitto Denko Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/76—Making non-permanent or releasable joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/087—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using both a rotary sonotrode and a rotary anvil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7435—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc the tool being a roller
    • 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
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7437—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc the tool being a perforating tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—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
    • B29C66/133—Fin-type joints, the parts to be joined being flexible
    • 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
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81457—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
    • 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
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • 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
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • 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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/843—Machines for making separate joints at the same time in different planes; Machines for making separate joints at the same time mounted in parallel or in series
    • B29C66/8432—Machines for making separate joints at the same time mounted in parallel or in series
    • 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
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
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Description

【０００１】
【産業上の利用分野】
本発明は、内面が離型処理された熱可塑性プラスチックフィルムで構成される衛生用品用の個装袋、及びその製造方法に関するものであり、特に生理用ナプキンや紙オムツなどの衛生用品に用いられる個装袋における離型処理面のシール方法に関するものである。
【０００２】
【従来の技術】
従来、例えば生理用ナプキンは、その形態の利便性、衛生上の理由などから、，紙あるいはプラスチックフィルムで１個ごとに包装したいわゆる個別包装の形態をとっているものが多く、一般に使用者は個別包装のシール部分を切り裂いて開封し、中のナプキンを取り出している。 この生理用ナプキンは着用時のずれを防止するために、両端もしくはその近傍にズレ防止用に粘着部を有する構造をとっているタイプが一般的で、通常、開封までは、その粘着部が紙あるいはプラスチックフィルムからなるセパレーターで保護されている。
【０００３】
【発明が解決しようとする課題】
しかしこのタイプでは、ナプキン装着時に剥がしたセパレーターが足元に散乱したり、静電気によって使用者にまとわりつき、その結果使用者は後処理に手間取るといった不都合があった。 またセパレーターは不要物として捨てられるため、資源の有効利用の観点からも望ましくはなかった。 これらの欠点を解決するため、プラスチックフィルムの内面を長鎖アルキル系やシリコーン系樹脂等の離型処理剤で直接離型処理し、セパレーターを無くしたタイプが考案されている。
【０００４】
また熱可塑性プラスチックフィルムを用いて個装袋を作製する場合、フィルムの融点付近の温度で周辺部をヒートシールするのが一般的である。 しかし、離型処理されたフィルムのヒートシールにおいて、離型処理面同士あるいは離型処理面と非離型処理面がそれぞれ向かい合った場合、離型処理層に阻害されるためヒートヒールすることは困難であった。 そのため例えば筋塗り離型処理などを施し、離型処理層が存在しない部分でヒートシールする方式がとられ、結果的にコスト高につながっていた。 また、フィルム融点よりも高い温度でヒートシールを行った場合、フィルムの破壊とともに離型処理層も破壊され、フィルム同士が溶着する場合もあるが、強固に溶着しすぎるため開封時にフィルムが延伸して破れにくいなどの不都合があった。
【０００５】
【課題を解決するための手段】
本発明者らはかかる状況下に鑑み、本発明において離型処理フィルムの離型処理面同士あるいは離型処理面と非離型処理面との新しいシール方法を提案し、さらにその方法により得られる開封容易な新規なセパレーターレス個装袋を提供することにより、前記種々の問題点を解決しようとするものである。
【０００６】
即ち本発明は、少なくとも片面の全面が離型処理された熱可塑性プラスチックフィルムの離型処理面同士あるいは離型処理面と非離型処理面をそれぞれ向かい合わせ、該フィルムの周辺部を、金属製の針状突起物を表面に有する板状物を用いて加熱プレスすることにより、該フィルムの周辺部を間欠的にシールして、内面に離型処理層を有するプラスチック袋を作製することを特徴とする衛生用品用の個装袋の製造方法に関する。
【０００７】
以下、本発明の実例を図面に基づいて説明する。
図１は、本発明で用いる針状突起物３を表面に有する金属板Ａの拡大斜視図である。 この針状突起物３の形状、サイズは、熱可塑性プラスチックフィルムに容易に孔が開けられるものであれば、特に限定されるものではないが、製品のサイズ等を考慮すると、通常太部の直径が0.2 〜1.5mm 程度、配置間隔は0.2 〜5mm 程度とするのが望ましい。
【０００８】
本発明においては、まず離型処理層２，２’を有する２枚の熱可塑性プラスチックフィルム１、１’を、これら離型処理層２及び２’が向かい合うように、例えばゴムシートの如き基台５上に設置する。 次いで上記熱可塑性プラスチックフィルム１及び１’の軟化温度程度にあらかじめ加熱した前記針状突起物３を表面に有する金属板Ａで、熱可塑性プラスチックフィルム１、１’の周辺部をプレスすることにより、該フィルムに貫通孔を開ける。 図２は、その貫通孔付近の断面拡大図であり、離型処理層２及び２’によって接触を妨げられていた外側の熱可塑性プラスチックフィルム１及び１’が加熱された針状突起物３の貫通と共に、その孔の断面から離型処理層の下地の熱可塑性プラスチックフィルムが露出する形となり、該プラスチックフィルムが加熱された突起物に触れて接触部４で溶融・融着し、間欠的シールが形成される。
本方法によれば、針状突起物を押し込み、引き抜くだけで容易にしかも短時間に間欠的シールが形成できるため、非常に効率的であるという利点がある。
【０００９】
上記シールを形成する箇所は、上記フィルムの周辺部であって、少なくとも２辺であり、その目的によって選択することができる。
また本発明で用いる熱可塑性プラスチックフィルムとしては、特に限定されないが、例えば厚さ１０〜５０μｍ程度のポリエチレン等のベースフィルムの少なくとも片面にシリコーン系、長鎖アルキル系樹脂等の離型剤で離型処理されたフィルムが挙げられる。 また加熱温度は、用いるフィルムの軟化温度や厚さ等を考慮して適宜設定することができるが、例えばフィルムがポリエチレンの場合、100 〜140 ℃程度が好ましい。
【００１０】
また本発明においては、上記貫通孔を開ける手段として、金属製の針状突起物で表面が覆われたロール状物を用いることにより、目的とする間欠的シールの形成を連続的に行うことができる。 図３は、この針状突起物を表面に有するロール６を用いてシールする場合を説明するための斜視図である。 原理は図１の金属板Ａを用いた場合と同様であり、ロール６に熱をかけてゴムロール７との間でプレスすることにより、２枚の離型処理した熱可塑性プラスチックフィルム８及び８’の離型処理面同士あるいは離型処理面と非離型処理面との、間欠的シール部９を連続的に形成することができる。
【００１１】
また本発明においては、該フィルムの周辺部のシール形成を、凹凸板や凹凸ロールを用いた超音波溶着法により行うこともでき、例えばいわゆる超音波ミシンを用いることにより、超音波溶着と機械的プレスを同時に行うことができる。
かかる方法は、発振機からでた電気エネルギーが振動エネルギーにかわり、それが溶着ローラーと工具ホーンの間で熱可塑性プラスチックフィルムに伝播し、分子間歪の摩擦熱に変換されてフィルムの溶融が起こり、間欠的シールが形成される。 その出力は20kHz が一般的であるが、振幅、圧力、処理時間等は特に限定されるものではなく、フィルムの種類、厚みによって最適な条件を設定すれば良い。 また上記超音波溶着法にさらにヒートプレスを組み合わせることにより、よりシール性を向上させて融着強度を上げることもできる。
【００１２】
また、本発明において最終的に個々の袋に仕上げる場合、シール部分で切断する必要があるが、上記シール作業と切断作業を同時に行うこともできる。 例えば前記金属板、熱ロール、超音波ロールに切断用刃を取付け、間欠的シール形成と同時に該シール部分で切断することができる。
【００１３】
【実施例】
本発明を実施例によりさらに詳細に説明する。
実施例１
片面全面をシリコーン樹脂で離型処理した２枚の熱可塑性プラスチックフィルム（ポリエチレン製、厚さ２０μｍ）を、離型処理面が向かい合うようにゴムシート上に設置し、該フィルムの周辺部を１００℃に加熱した金属製の針状突起物（太部の直径１mm、間隔２mm）を有する金属板にて、１００g/cm2 の荷重を１秒間かけて加熱プレスすることにより、周辺部（四辺）をシールした。 その後シール部を切断して本発明の個装袋を作製した。
【００１４】
実施例２
シール手段として、表面に針状突起物を有する水蒸気循環式の金属ロール（１００℃）を用いて、１m/min の速度で流した以外は、実施例１と同様にしてシールし、切断して本発明の個装袋を作製した。
【００１５】
実施例３
シール手段として、超音波溶着機を用い、出力２５０Ｗ、周波数２０kHz 、溶着速度２m/min の速度で流した以外は、実施例１と同様にしてシールし、切断して本発明の個装袋を作製した。
【００１６】
実施例４
実施例３における超音波溶着した後、１００℃でヒートシールし切断して本発明の個装袋を作製した。
【００１７】
比較例
実施例１で用いたプラスチックフィルムを１００℃でショップシーラー（富士インパルス社製）によりヒートシールし、切断して個装袋を作製した。
【００１８】
実施例及び比較例で得られたシール部のシール強度を、引張強度試験機にて測定したところ、以下の表１の如くであり、本発明によれば、シール部開封時にフィルムが破れることもなく、たとえ離型処理面同士であっても、良好にシールされていることが確認できた。
【００１９】
〔表１〕
Figure 0003826957
【００２０】
【発明の効果】
本発明によれば、たとえ離型処理フィルムの離型処理面同士あるいは離型処理面と非離型処理面とのシールであっても、良好かつ簡便にシールが得られるという利点があり、開封も容易で使い勝手のよい個装袋を提供することができる。
【図面の簡単な説明】
【図１】本発明で用いる針状突起物を表面に有する金属板の拡大斜視図である。
【図２】プラスチックフィルムの周辺部の貫通孔付近の断面拡大図である。
【図３】針状突起物を表面に有するロール６を用いてシールする場合を説明するための斜視図である。
【符号の説明】
１、１’ 熱可塑性プラスチックフィルム
２、２’ 離型処理層
３ 針状突起物
４ 接触部
５ 基台

Claims (3)

  1. 少なくとも片面の全面が離型処理された熱可塑性プラスチックフィルムの離型処理面同士あるいは離型処理面と非離型処理面をそれぞれ向かい合わせ、該フィルムの周辺部を、金属製の針状突起物を表面に有する板状物を用いて加熱プレスすることにより、該フィルムの周辺部を間欠的にシールして、内面に離型処理層を有するプラスチック袋を作製することを特徴とする衛生用品用の個装袋の製造方法。
  2. 少なくとも片面の全面が離型処理された熱可塑性プラスチックフィルムの離型処理面同士あるいは離型処理面と非離型処理面をそれぞれ向かい合わせ、該フィルムの周辺部を、金属製の針状突起物を表面に有するロール状物を用いて加熱プレスすることにより、間欠的シール部を連続的に形成して、内面に離型処理層を有するプラスチック袋を作製することを特徴とする衛生用品用の個装袋の製造方法。
  3. 請求項１又は２記載の衛生用品用の個装袋の製造方法により作製された、生理用ナプキンあるいは紙オムツなどの衛生用品用の個装袋。
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