JP2011101966A - Method for processing seal of synthetic resin sheet, method for manufacturing bag, seal processing device, and bag manufacturing equipment - Google Patents
Method for processing seal of synthetic resin sheet, method for manufacturing bag, seal processing device, and bag manufacturing equipment Download PDFInfo
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- JP2011101966A JP2011101966A JP2009257159A JP2009257159A JP2011101966A JP 2011101966 A JP2011101966 A JP 2011101966A JP 2009257159 A JP2009257159 A JP 2009257159A JP 2009257159 A JP2009257159 A JP 2009257159A JP 2011101966 A JP2011101966 A JP 2011101966A
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- synthetic resin
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- seal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/431—Joining the articles to themselves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
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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
- B29C65/74—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
- B29C65/745—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 a single unit having both a severing tool and a welding tool
- B29C65/7451—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 a single unit having both a severing tool and a welding tool the severing tool and the welding tool being movable with respect to one-another
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
- B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
- B29C66/81419—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled and flat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81431—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81433—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81433—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
- B29C66/81435—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 comprising several parallel ridges, e.g. for crimping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/84—Specific machine types or machines suitable for specific applications
- B29C66/851—Bag or container making machines
- B29C66/8511—Bag making machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—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
Abstract
Description
本発明は、合成樹脂シート製の袋を製造する場合等に好適に用いられるシール加工方法、袋の製造方法、シール加工装置及び袋の製造設備に関する。 The present invention relates to a seal processing method, a bag manufacturing method, a seal processing apparatus, and a bag manufacturing facility that are suitably used when manufacturing a bag made of a synthetic resin sheet.
従来、例えば、ポリエチレン製の気泡シートの製袋には、シールバーを用いたヒートシール方式や、インパルスシール方式が多用されている（例えば、特許文献１を参照）。すなわち、加熱したままのシールバーで気泡シートを加圧溶断するヒートシール方式、及びニクロム線にて気泡シートを押さえつけ通電することにより気泡シートを加熱溶断するインパルスシール方式が知られている。これらは、どちらの方法も気泡シートを加熱して融着溶断している。 Conventionally, for example, a heat seal method using a seal bar or an impulse seal method has been widely used in the production of polyethylene bubble sheets (see, for example, Patent Document 1). That is, there are known a heat sealing method in which a bubble sheet is pressed and fused with a heated seal bar, and an impulse sealing method in which the bubble sheet is heated and fused by pressing and energizing the bubble sheet with a nichrome wire. In both methods, the bubble sheet is heated and fused and cut.
しかし、これらの製袋方法によりポリプロピレン製の気泡シートを加工すると、加熱不足によるシール不良や口開き、加熱しすぎによる糸引き等の問題が多発し、良品を得ることが難しかった。これは、ポリプロピレンの温度と溶融張力の変化が大きく、強固に融着させながら糸を引かないように加工することができる温度範囲が狭く、気泡シートの厚みの変化に対応して温度を微妙にコントロールすることが非常に難しかったことによるものである。 However, when polypropylene foam sheets are processed by these bag making methods, problems such as poor sealing due to insufficient heating, opening of the mouth, stringing due to excessive heating, etc. frequently occur, making it difficult to obtain good products. This is because the temperature of the polypropylene and the melt tension change greatly, the temperature range that can be processed so as not to pull the yarn while fusing firmly is narrow, and the temperature is subtly responding to the change in the thickness of the bubble sheet This is because it was very difficult to control.
特に、気泡シートは周知のように中空の気泡を持つが、その気泡部は外部からの圧力に対しダンパーとして働き、圧力を減殺する。そのために、ヒートシール方式やインパルスシール方式で融着・溶断をしようとして加圧すると、気泡シートの気泡部には十分な圧力が加わらず、破線状にシール面が口開きを起こしてしまう。特に、気泡シートのフィルム厚が大きく、気泡部の強度が大きくなるとこの現象が起きやすい。すなわち、ヒートシール方式やインパルスシール方式は、外部から熱を加える方法であるため、シール面を十分に融着・溶断させるために、強い圧力を加える必要があった。 In particular, the air bubble sheet has hollow air bubbles as is well known, but the air bubble portion acts as a damper against the pressure from the outside to reduce the pressure. For this reason, when pressurization is performed so as to be fused or melted by a heat seal method or an impulse seal method, sufficient pressure is not applied to the bubble portion of the bubble sheet, and the sealing surface opens in a broken line shape. In particular, this phenomenon easily occurs when the film thickness of the bubble sheet is large and the strength of the bubble portion is increased. That is, since the heat sealing method and the impulse sealing method are methods of applying heat from the outside, it is necessary to apply a strong pressure in order to sufficiently fuse and melt the sealing surface.
その後、発明者の調査によれば、ポリエチレンのように温度変化とともにゆるやかに溶融張力の変化する樹脂は少なく、例えば脂肪族ポリエステルやポリ乳酸をはじめとする多くの樹脂はポリプロピレンのように急激に溶融張力が変化する樹脂であることがわかった。 After that, according to the inventor's investigation, there are few resins whose melt tension changes slowly with temperature change like polyethylene, and many resins such as aliphatic polyester and polylactic acid melt rapidly like polypropylene. It was found to be a resin with changing tension.
ところで近時、強度や耐熱性あるいは環境面の配慮等から、ポリエチレン以外の合成樹脂シートを用いた袋に対する要望が高まってきている。そのため、本発明者らは、ポリエチレンだけでなく、前述したポリプロピレン等の合成樹脂シートを用いた袋を歩留まりよく製造するための研究を行った。その結果、気泡シートの接合すべき部位に超音波を作用させることにより前述した不具合を解消または軽減させることができることが判明した。すなわち、気泡シートに分子振動を発生させる過程において、気泡部分が底付きを起こしていれば自己発熱により融着するので、それほど強く加圧することなく良好な接合強度を確保することができることがわかった。 Recently, there has been an increasing demand for bags using synthetic resin sheets other than polyethylene, in consideration of strength, heat resistance, environmental considerations, and the like. For this reason, the present inventors conducted research to produce not only polyethylene but also a bag using the above-described synthetic resin sheet such as polypropylene with high yield. As a result, it has been found that the above-described problems can be eliminated or reduced by applying ultrasonic waves to the portions to be joined of the bubble sheet. In other words, in the process of generating molecular vibrations in the bubble sheet, it was found that if the bubble part is bottomed out, it is fused by self-heating, so that good bonding strength can be ensured without applying too much pressure. .
また、そのような超音波を用いる場合に、超音波の作用によって融着のみ行う場合にあっては、シール面の中間を刃物で切って個別の袋としなければならない。ところが、シール位置の下流でシール面を切断することも考えられるが、ピンチロール等の自動送り手段を介して送ると、気泡シートは伸縮が激しく、所定の位置、すなわちシール面の中間を正確に切断することができないという問題も生じていた。 Further, when such ultrasonic waves are used, if only fusion is performed by the action of ultrasonic waves, the middle of the seal surface must be cut with a blade to form individual bags. However, it is conceivable to cut the sealing surface downstream of the sealing position. However, if the sheet is fed through an automatic feeding means such as a pinch roll, the bubble sheet is intensely expanded and contracted. There was also a problem that it could not be cut.
このような究明結果は、気泡シートだけでなく、内部に空洞を有する合成樹脂シート全般に当てはまる、という事実も明らかになった。 It has also been clarified that such investigation results apply not only to the bubble sheet but also to all synthetic resin sheets having cavities inside.
本発明は、以上のような課題及び究明結果に基づいてなされたもので、少なくとも、内部に空洞を形成するための立体構造を有した合成樹脂シートを良好に接合することが難しい、という課題を解消するものである。 The present invention has been made on the basis of the above problems and investigation results, and at least the problem that it is difficult to satisfactorily bond a synthetic resin sheet having a three-dimensional structure for forming a cavity inside. It will be solved.
本発明は、以上のような課題を解決するために、次のような構成を採用したものである。すなわち、本発明に係る合成樹脂シートのシール加工方法は、内部に空洞を形成するための立体構造を有してなる合成樹脂シートを重ね合わせ、その重ね合わせた合成樹脂シートの接合すべき部位に超音波を作用させて前記合成樹脂シートの素材の一部を発熱させ溶融させるとともに、その接合すべき部位に前記空洞が潰れる方向の機械的な圧縮力を加えることによって前記合成樹脂シートの接合すべき部位を接合させることを特徴とする。 The present invention employs the following configuration in order to solve the above-described problems. That is, the method for sealing a synthetic resin sheet according to the present invention includes a method of superposing synthetic resin sheets having a three-dimensional structure for forming a cavity therein, and attaching the synthetic resin sheets to the portions to be joined. The synthetic resin sheet is joined by applying a mechanical compressive force in a direction in which the cavities are crushed to a portion to be joined, while applying ultrasonic waves to heat and melt a part of the material of the synthetic resin sheet. It is characterized by joining the power parts.
このようなものであれば、超音波によって合成樹脂シートに分子振動が発生するため、自己発熱によって接合すべき部位が溶融状態となる。そのため、小さな押圧力によって合成樹脂シートの内部の空洞を圧潰することができ、その圧潰作用と前述した自己発熱とによって接合すべき部位が融着する。そのため、合成樹脂シートの接合すべき部位が口開き等の問題を起こすことなく接合され、合成樹脂シートが内部に空洞を形成するための立体構造を有していたとしても良好に接合することができる。 If it is such, since a molecular vibration will generate | occur | produce in a synthetic resin sheet with an ultrasonic wave, the site | part which should be joined will be in a molten state by self-heating. Therefore, the cavity inside the synthetic resin sheet can be crushed by a small pressing force, and the parts to be joined are fused by the crushing action and the self-heating described above. Therefore, the parts to be joined of the synthetic resin sheet are joined without causing problems such as opening of the mouth, and even if the synthetic resin sheet has a three-dimensional structure for forming a cavity inside, it can be joined well. it can.
また、重ね合わせた合成樹脂シートの接合すべき部位の近傍をクランプ部材によりクランプし、そのクランプ状態で前記接合すべき部位に超音波と圧縮力とを作用させて接合すれば、超音波や圧縮力により合成樹脂シートに上下方向の力が加わっても、接合すべき部位の近傍がしっかりと保持されるので、所望の接合すべき部位で適切に接合することができる。 In addition, if the vicinity of the part to be joined of the overlapped synthetic resin sheets is clamped by a clamp member, and the part to be joined is joined by applying an ultrasonic wave and a compressive force in the clamped state, the ultrasonic wave or the compression Even if a force in the vertical direction is applied to the synthetic resin sheet by force, the vicinity of the part to be joined is firmly held, so that it is possible to appropriately join at the desired part to be joined.
接合すべき部位の所定位置を正確に切断して合成樹脂シート同士を分断または分断可能な状態にするには、前記接合を行った後、前記クランプ状態を解除する前に、接合された部位を刃物を用いて切り離すようにすればよい。 In order to accurately cut the predetermined positions of the parts to be joined and to sever or sever the synthetic resin sheets, after joining, before releasing the clamped state, What is necessary is just to make it cut off using a blade.
前記合成樹脂シートの好適な一例としては、多数の気泡形成用突起を有してなるキャップフィルムと、このキャップフィルムの突起開放側に添着したバックフィルムと、前記キャップフィルムの突起先端側に添着したライナーフィルムとからなる３層構造の気泡シートを挙げることができるが、必ずしもこのようなものに限られない。例えば、前記ライナーフィルムを有しない２層構造の気泡シート等であってもよい。 As a preferred example of the synthetic resin sheet, a cap film having a large number of bubble forming protrusions, a back film attached to the protrusion opening side of the cap film, and attached to the protrusion tip side of the cap film. A bubble sheet having a three-layer structure composed of a liner film can be mentioned, but is not necessarily limited to this. For example, it may be a bubble sheet having a two-layer structure without the liner film.
また、前記合成樹脂シートの材料としては、ポリオレフィンを主材料にして構成されたもの、好ましくは、ポリプロピレンがよい。 The material of the synthetic resin sheet is preferably composed of polyolefin as a main material, preferably polypropylene.
また、重ね合わせた合成樹脂シートを一定方向に間欠的に送るとともに、その合成樹脂シートが停止するごとに、上述したシール加工方法を用いて前記合成樹脂シートに予め設定した所定の境界部分を接合させ、これら接合された境界部分間に袋をそれぞれ形成すれば、一定の開口を有した袋を製造することができる。 In addition, the superimposed synthetic resin sheets are intermittently sent in a fixed direction, and each time the synthetic resin sheet stops, a predetermined boundary portion set in advance is bonded to the synthetic resin sheet using the sealing method described above. If a bag is formed between the joined boundary portions, a bag having a certain opening can be manufactured.
このようなシール加工方法を実施するための好適なシール加工装置としては、前記合成樹脂シートを重ね合わせた状態でクランプするクランプ機構と、このクランプ機構によりクランプされた合成樹脂シートの接合すべき部位を接合させる熱溶着機構とを具備してなり、前記熱溶着機構が前記接合すべき部位に超音波を作用させるホーンと、このホーンと協働して前記接合すべき部位に気泡が潰れる方向の圧縮力を作用させるアンビルとを備えたものを挙げることができる。 As a suitable seal processing apparatus for carrying out such a seal processing method, a clamp mechanism that clamps the synthetic resin sheets in a stacked state, and a portion to which the synthetic resin sheet clamped by the clamp mechanism should be joined A horn that causes ultrasonic waves to act on the parts to be joined, and a direction in which bubbles collapse in the part to be joined in cooperation with the horn. A thing provided with the anvil which makes a compressive force act can be mentioned.
内部に空洞を形成した立体構造を有して成る合成樹脂シートに超音波を適切に作用させ接合すべき部位を接合するためには、アンビルが、合成樹脂シートの幅方向に長尺な挟圧面を有してなり、前記挟圧面が、合成樹脂シートを押圧するための複数の圧接凸部とこれら圧接凸部間に介在させた溝とを交互に配列してなるものであることが好ましい。 In order to join the part to be joined by appropriately applying ultrasonic waves to the synthetic resin sheet having a three-dimensional structure with a hollow inside, the anvil has a long pressing surface in the width direction of the synthetic resin sheet. It is preferable that the sandwiched surface is formed by alternately arranging a plurality of press contact convex portions for pressing the synthetic resin sheet and grooves interposed between the press contact convex portions.
このような圧接凸部の形状としては、前記圧接凸部がほぼ四辺形をなし、前記アンビルの短寸方向に延びる溝を介してそれら圧接凸部をアンビルの長手方向に配列させることにより縦目模様を形成してなるもの、前記圧接凸部がほぼ四辺形をなし、前記アンビルの長手方向に延びる溝を介してそれら圧接凸部をアンビルの短寸方向に配列させることにより横目模様を形成してなるもの、前記圧接凸部がほぼ四辺形をなし、前記アンビルの短寸方向に対して傾斜して延びる溝を介してそれら圧接凸部をアンビルの長手方向に配列させることにより斜目模様を形成してなるもの、前記圧接凸部がほぼ四辺形をなし、前記アンビルの短寸方向に延びる溝及び長手方向に延びる溝を介して、それら圧接凸部をアンビルの長手方向及び短寸方向にそれぞれ配列させることにより枡目模様を形成してなるもの等を挙げることができる。 As the shape of such a press-contact convex portion, the press-contact convex portion has a substantially quadrangular shape, and the press-contact convex portions are arranged in the longitudinal direction of the anvil through a groove extending in the short direction of the anvil. A pattern is formed, and the press-contact convex portions are substantially quadrilateral, and the press-contact convex portions are arranged in the short direction of the anvil through grooves extending in the longitudinal direction of the anvil to form a horizontal pattern. The press contact convex portion is substantially a quadrilateral, and the press contact convex portion is arranged in the longitudinal direction of the anvil through a groove extending obliquely with respect to the short direction of the anvil. The formed press-contact convex portion has a substantially quadrilateral shape, and the press-contact convex portion extends in the longitudinal direction and the short dimension direction of the anvil via the groove extending in the short dimension direction and the groove extending in the longitudinal direction of the anvil. That The like can be exemplified those obtained by forming a squares pattern by arranging.
圧接凸部が縦目模様、横目模様、斜目模様を形成してなるものである場合には、前記圧接凸部の短辺の長さ寸法が、０．５ｍｍ〜５．０ｍｍであり、かつ、前記溝の深さ寸法が０．４ｍｍ以上であることが好ましく、圧接凸部が桝目模様を形成してなるものである場合には、前記圧接凸部の一辺の長さ寸法が、０．７ｍｍ〜２．５ｍｍであるとともに、その一辺に隣接する他辺の長さ寸法が、０．５ｍｍ〜１．０ｍｍであり、かつ、前記溝の深さ寸法が０．４ｍｍ以上であることが好ましい。 When the press-contact convex part is formed by forming a vertical pattern, a horizontal pattern, or a diagonal pattern, the length dimension of the short side of the press-contact convex part is 0.5 mm to 5.0 mm, and The depth dimension of the groove is preferably 0.4 mm or more, and when the press-contact convex part is formed by forming a grid pattern, the length dimension of one side of the press-contact convex part is 0. It is preferable that the length dimension of the other side adjacent to one side is 0.5 mm to 1.0 mm and the depth dimension of the groove is 0.4 mm or more. .
さらに、前記熱溶着機構による合成樹脂シートの接合が終了した後、前記クランプ機構によるクランプ状態が解除される前に、前記接合された部位を刃物を用いて切り離す切断機構をさらに備えていれば、位置ずれを起こすことなく所定の位置で合成樹脂シート同士を切り離すことができる。 Furthermore, after the joining of the synthetic resin sheet by the thermal welding mechanism is completed, before the clamped state by the clamping mechanism is released, it further includes a cutting mechanism that separates the joined parts using a blade, The synthetic resin sheets can be separated from each other at a predetermined position without causing a positional shift.
合成樹脂シートとしてそれ自体柔軟で分子を振動させて発熱作用を惹起させることが難しい素材、例えばポリエチレン製のもの等を用いる場合の好適な態様としては、前記アンビルが、超音波による分子の振動を接合すべき合成樹脂シートに集中させるための自己発熱促進部材を備えたものを挙げることができる。例えば、ポリエチレン製の合成樹脂シートを接合する際に好適に用いられる自己発熱促進部材としては、シリコンゴム等を挙げることができる。 As a preferred mode in the case of using a material that is flexible as a synthetic resin sheet and difficult to induce a heat generation action by causing molecules to vibrate, for example, a material made of polyethylene, the anvil can cause vibration of molecules by ultrasonic waves. The thing provided with the self-heating-promoting member for making it concentrate on the synthetic resin sheet which should be joined can be mentioned. For example, as a self-heating promotion member that is suitably used when joining a synthetic resin sheet made of polyethylene, silicon rubber or the like can be used.
また、このようなシール加工装置を用いた好適な袋製造設備としては、重ね合わせた合成樹脂シートを一定方向に間欠的に送るシート供給装置と、その合成樹脂シートが停止するごとに前記合成樹脂シートに予め設定した所定の境界部分を接合させる前述したシール加工装置とを具備するものを挙げることができる。 Moreover, as a suitable bag manufacturing equipment using such a seal processing device, a sheet supply device that intermittently sends a superimposed synthetic resin sheet in a certain direction, and the synthetic resin every time the synthetic resin sheet stops. Examples thereof include those provided with the above-described sealing device for joining a predetermined boundary portion set in advance to the sheet.
本発明によれば、内部に空洞を形成するための立体構造を有した合成樹脂シートを良好に接合することが難しいという課題を解消することができる。 According to the present invention, the problem that it is difficult to satisfactorily bond a synthetic resin sheet having a three-dimensional structure for forming a cavity therein can be solved.
以下、本発明の一実施形態について図面を参照して説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
この実施形態は、図１ないし図４に示すように、本発明を合成樹脂シート製の袋Ａを製造するための袋製造設備１に適用した場合のものである。 In this embodiment, as shown in FIGS. 1 to 4, the present invention is applied to a bag manufacturing facility 1 for manufacturing a bag A made of a synthetic resin sheet.
この袋製造設備１は、図１に示すように、原反Ｓ０から繰り出され三角板２１により二つ折り状態に重ね合わされた合成樹脂シート、例えば気泡シートＳをニップロール２２により一定方向に間欠的に送るシート供給装置２と、その気泡シートＳが停止するごとに前記気泡シートＳに予め設定した所定の接合すべき部位Ｓ１を接合させるシール加工装置３と、切り離された製品、すなわち袋Ａを搬送するベルトコンベア等の搬送装置４とを具備してなる。 As shown in FIG. 1, the bag manufacturing facility 1 is a sheet in which a synthetic resin sheet, for example, a bubble sheet S, fed out from an original fabric S0 and superimposed in a folded state by a triangular plate 21 is intermittently sent in a fixed direction by a nip roll 22. A supply device 2, a seal processing device 3 that joins a predetermined portion S 1 to be joined to the bubble sheet S every time the bubble sheet S stops, and a belt that conveys the separated product, that is, the bag A And a conveying device 4 such as a conveyor.
シール加工装置３は、請求項１ないし６記載のシール加工方法を実施するためのもので、図１ないし図４に示すように、前記気泡シートＳを重ね合わせた状態でクランプするクランプ機構５と、このクランプ機構５によりクランプされた気泡シートＳの接合すべき部位Ｓ１を所定の接合位置Ｊにおいて接合させる熱溶着機構６とを具備してなり、前記熱溶着機構６が前記接合すべき部位Ｓ１に超音波を作用させるホーン６１と、このホーン６１と協働して前記接合すべき部位Ｓ１に気泡が潰れる方向の圧縮力を作用させるアンビル６２と、前記熱溶着機構６による気泡シートＳの接合が終了した後前記クランプ機構５によるクランプ状態が解除される前に、接合されたシール部Ｓ２を刃物７１を用いて切り離す切断機構７とを備えている。 The seal processing apparatus 3 is for carrying out the seal processing method according to claims 1 to 6, and as shown in FIGS. 1 to 4, a clamp mechanism 5 that clamps the bubble sheets S in an overlapped state, And a thermal welding mechanism 6 that joins a site S1 to which the bubble sheet S clamped by the clamping mechanism 5 is to be joined at a predetermined joining position J. The site S1 to be joined by the thermal welding mechanism 6 A horn 61 that causes ultrasonic waves to act on, an anvil 62 that cooperates with the horn 61 to apply a compressive force in a direction in which bubbles are crushed to the portion S1 to be joined, and joining of the bubble sheet S by the thermal welding mechanism 6 And the cutting mechanism 7 for separating the joined seal portion S2 using the blade 71 before the clamped state by the clamp mechanism 5 is released.
前記クランプ機構５は、図１ないし図４に示すように、重ね合わせた気泡シートＳが停止した際にその気泡シートＳを上下から挟持する上クランプバー５１及び下クランプバー５２と、ベース８に設置され前記下クランプバー５２を昇降駆動するエアシリンダ５４とを具備してなる。なお、５３は、後述するアンビルホルダー６５に保持され前記上クランプバー５１を支持するものである。このクランプ機構５は、前記接合位置Ｊの上流近傍と下流近傍とにそれぞれ一組ずつ設けられている。 As shown in FIGS. 1 to 4, the clamp mechanism 5 includes an upper clamp bar 51 and a lower clamp bar 52 that hold the bubble sheet S from above and below when the overlapped bubble sheet S stops, and a base 8. And an air cylinder 54 for moving the lower clamp bar 52 up and down. In addition, 53 is hold | maintained at the anvil holder 65 mentioned later, and supports the said upper clamp bar 51. FIG. One set of the clamp mechanism 5 is provided in the vicinity of the upstream and downstream of the joining position J.
前記熱溶着機構６は、図１ないし図４に示すように、前記接合位置Ｊの真下に設けられたホーン６１と、このホーン６１の上方に昇降可能に配されたアンビル６２と、このアンビル６２を昇降動作させるためのアンビル昇降機構６４とを具備してなる。 As shown in FIGS. 1 to 4, the thermal welding mechanism 6 includes a horn 61 provided immediately below the joining position J, an anvil 62 disposed so as to be movable up and down above the horn 61, and the anvil 62. And an anvil elevating mechanism 64 for elevating and lowering.
前記ホーン６１は、図２ないし図４に示すように、前記接合位置Ｊに沿って延びるバー状をなしており、上方に向けて超音波を発射し得るものである。このホーン６１が発する超音波の周波数及び強度は、前記気泡シートＳの素材の分子を振動させ発熱させ得る値に設定されている。 As shown in FIGS. 2 to 4, the horn 61 has a bar shape extending along the joining position J, and can emit ultrasonic waves upward. The frequency and intensity of the ultrasonic waves emitted from the horn 61 are set to values that can cause the molecules of the material of the bubble sheet S to vibrate and generate heat.
前記アンビル６２は、図２ないし図４に示すように、前記ホーン６１と協働して前記気泡シートＳの接合すべき部位Ｓ１に気泡を圧潰する方向の圧縮力を作用させるもので、前記ホーン６１とほぼ同一長さのバー状のものであり、その表面にはローレット加工等によって図示しない微細な凹凸が形成されている。この実施形態のアンビル６２は、その中央位置に、前記切断機構７の後述する刃物７１を収納するための下方に開口した溝６３を備えている。 2 to 4, the anvil 62 cooperates with the horn 61 to apply a compressive force in the direction of crushing the bubbles to the portion S1 to which the bubble sheet S is to be joined. It is a bar-shaped member having substantially the same length as 61, and fine irregularities (not shown) are formed on its surface by knurling or the like. The anvil 62 of this embodiment is provided with a groove 63 opened downward in the central position for accommodating a cutter 71 described later of the cutting mechanism 7.
前記アンビル昇降機構６４は、図２ないし図４に示すように、前記アンビル６２を保持するアンビルホルダー６５と、このアンビルホルダー６５を昇降させるためのアンビル昇降用シリンダ６６とを具備してなる。アンビル昇降用シリンダ６６は、前記アンビルホルダー６５の上方に配置された固定フレーム９に設置されている。また６７は、前記アンビルホルダー６５の姿勢を保持するための案内ロッドである。 As shown in FIGS. 2 to 4, the anvil elevating mechanism 64 includes an anvil holder 65 that holds the anvil 62 and an anvil elevating cylinder 66 for elevating the anvil holder 65. The anvil raising / lowering cylinder 66 is installed on a fixed frame 9 disposed above the anvil holder 65. Reference numeral 67 denotes a guide rod for maintaining the posture of the anvil holder 65.
前記切断機構７は、図１ないし図４に示すように、刃先部分を下方に突出させてアンビル６２の溝６３内に収容された切断用の刃物７１と、この刃物７１を昇降させるべく前記アンビル６２内に設けられた図示しない刃物昇降機構とを具備してなる。 As shown in FIGS. 1 to 4, the cutting mechanism 7 includes a cutting blade 71 housed in a groove 63 of the anvil 62 with the blade tip portion protruding downward, and the anvil for raising and lowering the blade 71. And a cutter lifting / lowering mechanism (not shown) provided in 62.
次に、このような袋製造設備１を用いて袋Ａを製造する手順を説明する。 Next, a procedure for manufacturing the bag A using such a bag manufacturing facility 1 will be described.
本実施形態においては、合成樹脂シートとして、例えば、多数の気泡形成用突起を有してなるキャップフィルムＣと、このキャップフィルムＣの突起開放側に添着したバックフィルムＢと、前記キャップフィルムＣの突起先端側に添着したライナーフィルムＬとからなる３層構造を有する気泡シートＳを用いている。この気泡シートＳは、従来品と同様であり、材料としては、常用のポリエチレンをはじめ、ポリプロピレンのようなポリオレフィン、エチレン−酢酸ビニル共重合体、ナイロンそのほか多種類のプラスチックが使用できるが、本実施形態においては、ポリプロピレンを用いている。 In the present embodiment, as the synthetic resin sheet, for example, a cap film C having a large number of bubble forming protrusions, a back film B attached to the protrusion opening side of the cap film C, and the cap film C A bubble sheet S having a three-layer structure composed of a liner film L attached to the tip end side of the protrusion is used. This air bubble sheet S is the same as the conventional product, and as materials, conventional polyethylene, polyolefin such as polypropylene, ethylene-vinyl acetate copolymer, nylon and many other types of plastics can be used. In the form, polypropylene is used.
まず、原反Ｓ０から繰り出された気泡シートＳは、図１に示すように、三角板２１により二つ折りに重ね合わせられ、ニップロール２２により接合位置Ｊに向けて間欠的に一定量が送り出される。すなわち、重ね合わせられた気泡シートＳの先端側は、製品である袋Ａの開口幅寸法に相当する距離だけ前記接合位置Ｊを超えて供給され、接合すべき部位Ｓ１が接合位置Ｊに達した時点でニップロール２２が停止する。 First, as shown in FIG. 1, the bubble sheet S fed out from the original fabric S0 is folded in two by the triangular plate 21 and is intermittently sent out toward the joining position J by the nip roll 22. That is, the end side of the overlapped bubble sheet S is supplied beyond the joining position J by a distance corresponding to the opening width dimension of the bag A as a product, and the part S1 to be joined has reached the joining position J. At that time, the nip roll 22 stops.
この停止中に、図２に示すように、上クランプバー５１とアンビルホルダー６５が同時に降下し、超音波溶着が行われる。すなわち、前記接合すべき部位Ｓ１の上流側と下流側において気泡シートＳがクランプされ、ホーン６１とアンビル６２との協働により気泡シートＳの接合すべき部位Ｓ１が図２に示すように溶着され、シール部Ｓ２が形成される。 During this stop, as shown in FIG. 2, the upper clamp bar 51 and the anvil holder 65 are simultaneously lowered, and ultrasonic welding is performed. That is, the bubble sheet S is clamped on the upstream side and the downstream side of the part S1 to be joined, and the part S1 to be joined of the bubble sheet S is welded as shown in FIG. 2 in cooperation with the horn 61 and the anvil 62. A seal portion S2 is formed.
次に、超音波溶着完了後、図３に示すように、上下のクランプバー５１、５２にて気泡シートＳがずれないように保持した状態で、上クランプバー５１及びアンビルホルダー６５、並びに下クランプバー５２が同時に上昇する。そして、ホーン６１とアンビル６２との間にギャップが設けられた状態で、刃物７１が降下し、前記シール部Ｓ２の中央を切断する。このようにして境界部分となるシール部Ｓ２を順次切り離される気泡シートＳが、製品である袋Ａとなる。 Next, after completion of the ultrasonic welding, as shown in FIG. 3, the upper clamp bar 51, the anvil holder 65, and the lower clamp are held with the upper and lower clamp bars 51, 52 so that the bubble sheet S is not displaced. Bar 52 rises simultaneously. Then, in a state where a gap is provided between the horn 61 and the anvil 62, the blade 71 descends and cuts the center of the seal portion S2. In this way, the air bubble sheet S from which the seal portion S2 that is the boundary portion is sequentially cut out becomes a bag A that is a product.
シール部Ｓ２の中央を切断後、図４に示すように、下クランプバー５２が降下し、切り離された袋Ａは搬送装置４たるベルトコンベアによって搬送される。 After cutting the center of the seal portion S2, as shown in FIG. 4, the lower clamp bar 52 is lowered, and the separated bag A is conveyed by the belt conveyor as the conveying device 4.
以上に述べたように、本実施形態に係る気泡シートＳのシール加工方法は、内部に空洞を有してなる３層構造の気泡シートＳを２つ折りにして重ね合わせ、その接合すべき部位Ｓ１に超音波を作用させて前記気泡シートＳの素材の一部を発熱させ溶融させるとともに、その接合すべき部位Ｓ１に前記空洞が潰れる方向の機械的な圧縮力を加えることによって前記気泡シートＳの接合すべき部位Ｓ１を接合させるので、このような気泡シートＳであっても良好に接合することが可能となる。すなわち、超音波によって気泡シートＳに分子振動が発生し、自己発熱によって接合すべき部位Ｓ１が溶融状態となる。そのため、小さな押圧力によって気泡シートＳの内部の空洞、換言すれば、キャップフィルムＣとバックフィルムＢとによって形成される空間またはキャップフィルムＣとライナーフィルムＬとによって形成される空間を圧潰することができ、その圧潰作用と前述した自己発熱とによって接合すべき部位Ｓ１のキャップフィルムＣ、バックフィルムＢ、ライナーフィルムＬが融着する。そのため、気泡シートＳの接合すべき部位Ｓ１が口開き等の問題を起こすことなく接合され、気泡シートＳが内部に空洞を形成するための立体構造を有していたとしても良好に接合することができる。 As described above, the method for sealing the air bubble sheet S according to the present embodiment folds the air bubble sheet S having a three-layer structure having a cavity inside and folds the two, and joins the portions S1 to be joined. A part of the material of the bubble sheet S is heated and melted by applying an ultrasonic wave to the element, and a mechanical compressive force in a direction in which the cavity is crushed is applied to a portion S1 to be joined. Since the part S1 to be joined is joined, even such a bubble sheet S can be joined satisfactorily. That is, molecular vibration is generated in the bubble sheet S due to the ultrasonic waves, and the site S1 to be joined is melted by self-heating. Therefore, the space inside the bubble sheet S, that is, the space formed by the cap film C and the back film B or the space formed by the cap film C and the liner film L can be crushed by a small pressing force. The cap film C, the back film B, and the liner film L at the site S1 to be joined are fused by the crushing action and the self-heating described above. Therefore, the portion S1 to which the bubble sheet S is to be joined is joined without causing problems such as opening of the mouth, and even if the bubble sheet S has a three-dimensional structure for forming a cavity therein, it can be joined well. Can do.
特に、溶着の際に超音波を用いているので、気泡シートＳの厚み、またはキャップフィルムＣ、バックフィルムＢ、ライナーフィルムＬの厚みの変化による加熱量の変化をいちいち調整する必要がなく、気泡を押さえつける力も格段に弱くて済む。そのため、シール加工装置３の運転が容易な上に、ショットスピードも比較的短くすることができ、運転サイクルを早くすることができる。また、気泡シートＳに外部から熱を加えるわけではないので、シール加工装置３において雰囲気温度の変化の影響をほとんど受けることがない。そのため、一度設定した運転条件は、夏でも冬でも再現性がある。さらに、アンビル６２の表面にローレット加工等により微細な凹凸が形成されているので、超音波による振動をより効率的に伝達することができ、接着すべき部位Ｓ１を良好に接合することができる。 In particular, since ultrasonic waves are used for welding, there is no need to adjust the change in the heating amount due to the change in the thickness of the bubble sheet S or the thickness of the cap film C, the back film B, and the liner film L. The force to hold down is also much weaker. Therefore, the operation of the seal processing apparatus 3 is easy and the shot speed can be made relatively short, so that the operation cycle can be shortened. In addition, since heat is not applied to the bubble sheet S from the outside, the seal processing apparatus 3 is hardly affected by changes in the ambient temperature. Therefore, once set operating conditions are reproducible in summer and winter. Furthermore, since fine irregularities are formed on the surface of the anvil 62 by knurling or the like, vibration due to ultrasonic waves can be transmitted more efficiently, and the part S1 to be bonded can be satisfactorily joined.
なお、本実施形態におけるシール加工装置３は、アンビル６２の表面の凹凸形状を変えることにより、気泡シートＳまたはその気泡シートＳを構成するキャップフィルムＣ、バックフィルムＢ、ライナーフィルムＬが比較的厚みを有するものであっても、比較的薄いものであっても、接着すべき部位Ｓ１を良好に接合することができるようにしている。すなわち、アンビル６２が、気泡シートＳの幅方向に長尺な挟圧面を有してなり、前記挟圧面が、気泡シートＳを押圧するための複数の圧接凸部とこれら圧接凸部間に介在させた溝とを交互に配列してなるものである。なお、以下図５乃至図１７に示すアンビル６２は、熱溶着機構６を構成する一要素として用いられるものであり、前記シール加工装置３において表面側を下側にして設置されるものである。また、刃物７１を省略して示している。 In the seal processing apparatus 3 in the present embodiment, the bubble sheet S or the cap film C, the back film B, and the liner film L constituting the bubble sheet S are relatively thick by changing the uneven shape of the surface of the anvil 62. Even if it has a thin film or a relatively thin film, the portion S1 to be bonded can be satisfactorily bonded. That is, the anvil 62 has a pressing surface that is long in the width direction of the bubble sheet S, and the pressing surface is interposed between a plurality of pressing protrusions for pressing the bubble sheet S and the pressing protrusions. The grooves are arranged alternately. The anvil 62 shown in FIGS. 5 to 17 is used as one element constituting the heat welding mechanism 6 and is installed with the surface side facing down in the seal processing apparatus 3. Further, the cutter 71 is omitted.
なお、ローレット加工等を施した後のアンビル６２の表面の凹凸形状やその寸法は図示するものに限られず、一般的なものであってもよいが、前述したような内部に空洞を形成するための立体構造を有してなる場合においては、表面に形成される凸の形状やその寸法はより小さい方が、また、凹形状すなわち溝の深さはシートまたはフィルムの厚みに対応してある程度大きい方が好ましい。 Note that the irregular shape and dimensions of the surface of the anvil 62 after knurling or the like are not limited to those shown in the figure, and may be general, but in order to form a cavity in the interior as described above In the case of having the three-dimensional structure, the convex shape formed on the surface and the size thereof are smaller, and the concave shape, that is, the depth of the groove is somewhat large corresponding to the thickness of the sheet or film. Is preferred.
まず、比較的厚みを有するシートまたはフィルムを接合するための好適なアンビル６２の形状を以下に詳述する。 First, the shape of a suitable anvil 62 for joining a relatively thick sheet or film will be described in detail below.
例えば、アンビル６２の第一態様としては、図５及び図６に示すように、圧接凸部がほぼ四辺形をなし、アンビル６２の短寸方向に延びる溝を介してそれら圧接凸部をアンビル６２の長手方向に配列させることにより縦目模様を形成してなるものが挙げられる。詳述すれば、前記圧接凸部はほぼ長方形をなし、その圧接凸部の短辺の長さ寸法ａ１が５ｍｍ以下、溝の開口幅寸法ｂ１が１ｍｍ以下、溝の深さ寸法ｃ１が０．４ｍｍ以上となるように設定されている。 For example, as a first aspect of the anvil 62, as shown in FIGS. 5 and 6, the press contact convex portions have a substantially quadrangular shape, and the press contact convex portions are formed through grooves extending in the short direction of the anvil 62. And those formed by forming a vertical pattern by arranging them in the longitudinal direction. More specifically, the pressure contact convex portion has a substantially rectangular shape, the length dimension a1 of the short side of the pressure contact convex portion is 5 mm or less, the groove opening width dimension b1 is 1 mm or less, and the groove depth dimension c1 is 0.00. It is set to be 4 mm or more.
また、アンビル６２の第二態様としては、図７及び図８に示すように、圧接凸部がほぼ四辺形をなし、アンビル６２の短寸方向に対して傾斜して点在する溝を介してそれら圧接凸部をアンビル６２の長手方向に互いに直交させて配列させることにより、交差した斜目模様を形成してなるものが挙げられる。詳述すれば、前記圧接凸部はほぼ長方形をなし、その圧接凸部の短辺の長さ寸法ａ２が１ｍｍ以下、溝の開口幅寸法ｂ２が１ｍｍ以下、溝の深さ寸法ｃ２が０．４ｍｍ以上となるように設定されている。また、溝の傾斜角ｄ２は３０度〜６０度が好ましく、溝の形状は三角錐または多角錐としている。 Further, as a second mode of the anvil 62, as shown in FIGS. 7 and 8, the press contact convex portion has a substantially quadrangular shape, and through the grooves that are inclined with respect to the short dimension of the anvil 62. These press contact convex portions are arranged so as to intersect with each other in the longitudinal direction of the anvil 62 so as to form crossed oblique patterns. More specifically, the pressure contact convex portion is substantially rectangular, the length a2 of the short side of the pressure contact convex portion is 1 mm or less, the groove opening width dimension b2 is 1 mm or less, and the groove depth dimension c2 is 0. It is set to be 4 mm or more. Further, the inclination angle d2 of the groove is preferably 30 to 60 degrees, and the shape of the groove is a triangular pyramid or a polygonal pyramid.
また、アンビル６２の第三態様としては、図９及び図１０に示すように、圧接凸部がほぼ四辺形をなし、アンビル６２の短寸方向に対して傾斜して延びる溝を介してそれら圧接凸部をアンビル６２の長手方向に配列させることにより斜目模様を形成してなるものが挙げられる。詳述すれば、前記圧接凸部はほぼ平行四辺形をなし、その圧接凸部の短辺の長さ寸法ａ３が２ｍｍ以下、溝の開口幅寸法ｂ３が１ｍｍ以下、溝の深さ寸法ｃ３が０．４ｍｍ以上となるように設定されている。また、溝の傾斜角ｄ３は３０度〜６０度が好ましい。 As shown in FIGS. 9 and 10, the third aspect of the anvil 62 is that the press-contact convex portions are substantially quadrilateral and are pressed through grooves extending inclining with respect to the short direction of the anvil 62. An example is one in which a convex pattern is formed in the longitudinal direction of the anvil 62 to form a diagonal pattern. More specifically, the pressure contact convex portion has a substantially parallelogram shape, the length dimension a3 of the short side of the pressure contact convex portion is 2 mm or less, the groove opening width dimension b3 is 1 mm or less, and the groove depth dimension c3 is It is set to be 0.4 mm or more. Further, the inclination angle d3 of the groove is preferably 30 to 60 degrees.
次に、比較的薄いシートまたはフィルムを接合するための好適なアンビル６２の形状を以下に詳述する。 The preferred anvil 62 shape for joining relatively thin sheets or films will now be described in detail.
また、アンビル６２の第四態様としては、図１１及び図１２に示すように、圧接凸部がほぼ四辺形をなし、アンビル６２の短寸方向に延びる溝を介してそれら圧接凸部をアンビル６２の長手方向に配列させることにより縦目模様を形成してなるものが挙げられる。詳述すれば、前記圧接凸部はほぼ台形をなし、その圧接凸部の短辺の長さ寸法ａ４が０．５ｍｍ以下、溝の開口幅寸法ｂ４が１ｍｍ以下、溝の深さ寸法ｃ４が０．４ｍｍ以上となるように設定されている。また、溝の傾斜角ｄ４は３０度〜６０度が好ましい。 Further, as a fourth mode of the anvil 62, as shown in FIGS. 11 and 12, the press-contact convex portions are substantially quadrilateral, and the press-contact convex portions are formed via grooves extending in the short direction of the anvil 62. And those formed by forming a vertical pattern by arranging them in the longitudinal direction. More specifically, the pressure contact convex portion has a substantially trapezoidal shape, the length dimension a4 of the short side of the pressure contact convex portion is 0.5 mm or less, the groove opening width dimension b4 is 1 mm or less, and the groove depth dimension c4 is as follows. It is set to be 0.4 mm or more. Further, the inclination angle d4 of the groove is preferably 30 to 60 degrees.
アンビル６２の第五態様としては、図１３及び図１４に示すように、圧接凸部がほぼ四辺形をなし、アンビル６２の長手方向に延びる溝を介してそれら圧接凸部をアンビル６２の短寸方向に配列させることにより横目模様を形成してなるものが挙げられる。詳述すれば、前記前記圧接凸部はほぼ台形をなし、その圧接凸部の短辺の長さ寸法ａ５が０．５ｍｍ以下、溝の開口幅寸法ｂ５が１ｍｍ以下、溝の深さ寸法ｃ５が０．４ｍｍ以上となるように設定されている。また、溝の傾斜角ｄ５は３０度〜６０度が好ましい。 As shown in FIGS. 13 and 14, the fifth aspect of the anvil 62 is that the pressure contact convex portions are substantially quadrilateral, and the pressure contact convex portions are formed in a short dimension of the anvil 62 through a groove extending in the longitudinal direction of the anvil 62. The thing formed by forming a horizontal pattern by arranging in a direction is mentioned. More specifically, the pressure contact convex portion has a substantially trapezoidal shape, the length dimension a5 of the short side of the pressure contact convex portion is 0.5 mm or less, the groove opening width dimension b5 is 1 mm or less, and the groove depth dimension c5. Is set to be 0.4 mm or more. The groove inclination angle d5 is preferably 30 to 60 degrees.
アンビル６２の第六態様としては、図１５ないし図１７に示すように、圧接凸部がほぼ四辺形をなし、アンビル６２の短寸方向に延びる溝及び長手方向に延びる溝を介して、それら圧接凸部をアンビル６２の長手方向及び短寸方向にそれぞれ配列させることにより枡目模様を形成してなるものが挙げられる。詳述すれば、前記圧接凸部はほぼ長方形をなし、その圧接凸部の一辺の長さ寸法ａ６１が３ｍｍ以下、その一辺に隣接する他辺の長さ寸法ａ６２が１ｍｍ以下、溝の深さ寸法が０．４ｍｍ以上となるように設定されている。 As shown in FIG. 15 to FIG. 17, the sixth embodiment of the anvil 62 includes a press-contact convex portion having a substantially quadrangular shape, and a press-contact between the anvil 62 extending in the short dimension direction and a groove extending in the longitudinal direction. Examples include those in which a convex pattern is arranged in the longitudinal direction and the short dimension of the anvil 62 to form a checkerboard pattern. More specifically, the pressure contact convex part is substantially rectangular, the length dimension a61 of one side of the pressure contact convex part is 3 mm or less, the length dimension a62 of the other side adjacent to the one side is 1 mm or less, and the depth of the groove. The dimension is set to be 0.4 mm or more.
また、キャップフィルムＣ、バックフィルムＢ、ライナーフィルムＬはそれぞれ同材質である合成樹脂によって形成されているので、非常に高い強度を得ることができるとともに、シール部Ｓ２にあたる気泡シートＳの樹脂は完全に溶融するため、出来上がった袋Ａに高い機密性が得られるという効果も得られる。 Further, since the cap film C, the back film B, and the liner film L are each formed of the same synthetic resin, it is possible to obtain very high strength, and the resin of the bubble sheet S corresponding to the seal portion S2 is completely Therefore, it is possible to obtain a high confidentiality in the completed bag A.
また、重ね合わせた気泡シートＳの接合すべき部位Ｓ１の近傍をクランプバー５１、５２によりクランプし、そのクランプ状態で前記接合すべき部位Ｓ１に超音波と圧縮力とを作用させて接合しているため、接合すべき部位Ｓ１の上流側近傍及び下流側近傍が上下方向からしっかりと保持され、所望の接合すべき部位Ｓ１で適切に接合することができる。 Further, the vicinity of the part S1 to be joined of the overlapped bubble sheet S is clamped by the clamp bars 51 and 52, and in the clamped state, the part S1 to be joined is made to act by applying an ultrasonic wave and a compressive force. Therefore, the vicinity of the upstream side and the vicinity of the downstream side of the part S1 to be joined are firmly held from above and below, and the desired part S1 to be joined can be appropriately joined.
さらに、前記接合を行った後、前記クランプ状態を解除する前に、接合された部位を刃物７１を用いて切り離しているので、接合すべき部位Ｓ１の所定位置を正確に切断して気泡シート同士を分断または分断することができる。すなわち、位置ずれを起こすことなく所定の位置で気泡シートＳ同士を切り離すことができる。 Further, after the joining, before the clamped state is released, the joined part is separated using the blade 71, so that the predetermined position of the part S1 to be joined is accurately cut and the bubble sheets are separated from each other. Can be divided or divided. That is, the bubble sheets S can be separated from each other at a predetermined position without causing a positional shift.
また、合成樹脂シートとして、３層構造の気泡シートＳであるので、バックフィルムＢ及びライナーフィルムＬのいずれの面を袋Ａの収納空間側にするかを選択することができ、その選択を袋Ａに入れる内容物の性質等により行うことが可能となる。また、バックフィルムＢ及びライナーフィルムＬの材料を適宜選択することができるため、再生材料を使用する場合であっても、必要な面に新しい層を位置させることができる。 Moreover, since it is the bubble sheet S of a three-layer structure as a synthetic resin sheet, it can be selected which surface of the back film B and the liner film L is made into the storage space side of the bag A, and the selection is made by the bag. This can be performed depending on the nature of the contents to be put in A. Moreover, since the material of the back film B and the liner film L can be selected as appropriate, a new layer can be positioned on a necessary surface even when a recycled material is used.
なお、本発明は以上に述べた実施形態に限られない。 The present invention is not limited to the embodiment described above.
合成樹脂シートの主材料としては、上述したような主減量としてポリオレフィンのうちヒンジ特性の良好なポリプロピレンに替えて、ポリエチレンやエチレン−酢酸ビニル共重合体、ナイロンそのほか多種類のプラスチックが使用できる。 As the main material of the synthetic resin sheet, polyethylene, ethylene-vinyl acetate copolymer, nylon and many other types of plastics can be used instead of polypropylene having good hinge characteristics as a main weight loss as described above.
また、内部空洞を有するものであれば、気泡シートＳに限られず、気泡シートに比べて剛性を有する気泡ボードやプラスチック段ボール等種々のものを用いることができる。すなわち、プラスチックの溶融押し出しにより形成された２枚のシートとそれらを連結して平行に走る多数のリブとからなる成型品である「プラスチック段ボール」や、プラスチックシートに所定ピッチで垂直方向の部分を与え、長手方向に順次折り重ねることによって作られるハニカム構造を有する成型品である「プラスチック折り畳みハニカムボード」であってもよく、また、例えばポリプロピレン等の樹脂をダイスから溶融した状態で押し出したシートに、多数のキャップ状の突起を真空成形し、このキャップシートの底面と頂面にそれぞれ平坦なバックシート及びライナーシートを融着させて中空構造の板としてなる成型品である「気泡ボード」であってもよい。 Moreover, as long as it has an internal cavity, it is not restricted to the bubble sheet S, Various things, such as a bubble board and a plastic cardboard which have rigidity compared with a bubble sheet, can be used. That is, "plastic corrugated cardboard" which is a molded product consisting of two sheets formed by melt extrusion of plastic and a large number of ribs that run parallel to each other, or a vertical portion of plastic sheet with a predetermined pitch It may be a `` plastic folded honeycomb board '' which is a molded product having a honeycomb structure formed by sequentially folding in the longitudinal direction, and for example, a sheet extruded from a die such as polypropylene melted from a die This is a “bubble board” which is a molded product formed by vacuum forming a large number of cap-shaped protrusions and fusing a flat back sheet and liner sheet to the bottom and top surfaces of the cap sheet, respectively, to form a hollow structure plate. May be.
さらに、気泡シートまたは気泡ボードにおいて、キャップフィルムまたはキャップシート、バックフィルムまたはバックシート、及びライナーフィルムまたはライナーシートからなる３層構造を有するもののみならず、キャップフィルムまたはキャップシート、及びバックフィルムまたはバックシートからなる２層構造のものであってもよい。 Furthermore, in the bubble sheet or bubble board, not only those having a three-layer structure consisting of a cap film or cap sheet, a back film or back sheet, and a liner film or liner sheet, but also a cap film or cap sheet, and a back film or back A two-layer structure made of sheets may be used.
さらに、合成樹脂シートを重ねる際には、１枚のシートを二つ折りする以外にも、２枚またはそれ以上の枚数のシートを重ねるものであってもよい。また、シートを半折りする方法としては、上述した三角板には限られず、１つまたは複数の回転円盤を用いるものや、三角板との組合せによるものであってもよい。 Further, when the synthetic resin sheets are stacked, in addition to folding one sheet in half, two or more sheets may be stacked. Further, the method of half-folding the sheet is not limited to the triangular plate described above, and may be a method using one or a plurality of rotating disks or a combination with a triangular plate.
また、切断機構は、シール部を全体に渡って切断して完全に切り離すものに限られず、シール部の一部を切断し完全には切り離されていない状態にするものであってもよい。 Further, the cutting mechanism is not limited to the one that cuts the seal part over the whole and completely separates it, and may be a part that cuts a part of the seal part and is not completely separated.
その他、本発明の趣旨を損ねない範囲で種々に変更してよい。 In addition, various changes may be made without departing from the spirit of the present invention.
Ｓ…気泡シート
Ｓ１…接合すべき部位
Ｃ…キャップフィルム
Ｂ…バックフィルム
Ｌ…ライナーフィルム
１…袋製造設備
２…シート供給装置
３…シール加工装置
５…クランプ機構
６…熱溶着機構
６１…ホーン
６２…アンビル
７…切断機構
７１…刃物
DESCRIPTION OF SYMBOLS S ... Bubble sheet S1 ... The site | part which should be joined C ... Cap film B ... Back film L ... Liner film 1 ... Bag manufacturing equipment 2 ... Sheet supply apparatus 3 ... Seal processing apparatus 5 ... Clamp mechanism 6 ... Thermal welding mechanism 61 ... Horn 62 ... anvil 7 ... cutting mechanism 71 ... cutlery
Claims (18)
前記合成樹脂シートを重ね合わせた状態でクランプするクランプ機構と、このクランプ機構によりクランプされた合成樹脂シートの接合すべき部位を接合させる熱溶着機構とを具備してなり、前記熱溶着機構が前記接合すべき部位に超音波を作用させるホーンと、このホーンと協働して前記接合すべき部位に気泡が潰れる方向の圧縮力を作用させるアンビルとを備えたものであることを特徴とするシール加工装置。 A seal processing apparatus for carrying out the seal processing method according to claim 1, 2, 3, 4, 5 or 6,
A clamping mechanism that clamps the synthetic resin sheets in an overlapped state; and a thermal welding mechanism that joins the portions to be joined of the synthetic resin sheets clamped by the clamping mechanism. A seal comprising: a horn that causes ultrasonic waves to act on portions to be joined; and an anvil that cooperates with the horn to act on a compressive force in a direction in which bubbles are crushed at the portions to be joined. Processing equipment.
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| WO2023048176A1 (en) * | 2021-09-22 | 2023-03-30 | ゼネラルパッカー株式会社 | Bag feeding device and bag-feeding packaging machine provided with same |
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| JP5421073B2 (en) | 2014-02-19 |
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