JP6600552B2 - Manufacturing method of pant-type absorbent article - Google Patents

Manufacturing method of pant-type absorbent article Download PDF

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JP6600552B2
JP6600552B2 JP2015250660A JP2015250660A JP6600552B2 JP 6600552 B2 JP6600552 B2 JP 6600552B2 JP 2015250660 A JP2015250660 A JP 2015250660A JP 2015250660 A JP2015250660 A JP 2015250660A JP 6600552 B2 JP6600552 B2 JP 6600552B2
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ultrasonic
absorbent article
type absorbent
side seal
continuous body
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JP2017113194A (en
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周平 菅谷
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Kao Corp
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Kao 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
    • 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
    • B29C66/81463—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 plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B29C66/81469—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 plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint one placed next to the other in a single line transverse to the feed direction, e.g. shoulder to shoulder sonotrodes
    • 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
    • B29C65/086—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 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
    • 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
    • B29C66/135—Single hemmed joints, i.e. one of the parts to be joined being hemmed in the joint area
    • B29C66/1352—Single hem to hem 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
    • B29C66/345—Progressively making the joint, e.g. starting from the middle
    • B29C66/3452—Making complete joints by combining partial 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
    • B29C66/346—Making joints having variable thicknesses in the joint area, e.g. by using jaws having an adapted configuration
    • 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
    • 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
    • B29C66/72—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
    • B29C66/729—Textile or other fibrous material made from plastics
    • B29C66/7294—Non woven mats, e.g. felt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—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
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9241—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power
    • B29C66/92451—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power using joining tools having different pressure zones or using several joining tools with different pressures
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools
    • B29C66/92611—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by controlling or regulating the gap between the joining 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
    • B29C66/40—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
    • B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • 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
    • B29L2031/48—Wearing apparel
    • B29L2031/4871—Underwear
    • B29L2031/4878—Diapers, napkins

Description

本発明は、サイドシール部を有するパンツ型吸収性物品の製造方法に関する。   The present invention relates to a method for manufacturing a pant-type absorbent article having a side seal portion.

従来のパンツ型吸収性物品として、吸収性本体と、該吸収性本体を固定している外装体とを備え、腹側部における外装体の両側部と背側部における外装体の両側部とが接合されて形成された一対のサイドシール部を有するパンツ型の使い捨ておむつが知られている。   As a conventional pant-type absorbent article, an absorbent main body and an exterior body fixing the absorbent main body are provided, and both sides of the exterior body on the abdominal side and both sides of the exterior body on the back side A pants-type disposable diaper having a pair of side seal portions formed by joining is known.

このようなパンツ型使い捨ておむつの製造においては、一般に、複数の使い捨ておむつが一方向（搬送方向）に連なった構成のおむつ連続体を製造し、そのおむつ連続体のサイドシール部形成予定部位におけるシートどうしを熱シール装置等の接合装置により接合してサイドシール部を形成した後、そのおむつ連続体を、公知の切断手段により切断して、一対のサイドシール部を有する個々のおむつを得る。
また、サイドシール部を形成する接合装置として、超音波ホーンにより被接合物に超音波振動を印加し熱融着させる超音波シール装置を用いることも知られている（特許文献１参照）。 In manufacturing such a pants-type disposable diaper, generally, a diaper continuous body having a configuration in which a plurality of disposable diapers are linked in one direction (conveying direction) is manufactured, and a sheet at a site where a side seal portion of the diaper continuous body is to be formed is formed. After joining each other by a joining device such as a heat sealing device to form a side seal portion, the diaper continuous body is cut by a known cutting means to obtain individual diapers having a pair of side seal portions.
In addition, it is also known to use an ultrasonic sealing device that applies an ultrasonic vibration to an object to be bonded by an ultrasonic horn and heat-seal the bonding device for forming the side seal portion (see Patent Document 1).

特開２００４−３３０６２２号公報JP 2004-330622 A

超音波シール装置としては、例えば、超音波発振器、コンバーター、ブースター及び超音波ホーンを備えたものが広く知られており、その超音波シール装置においては、超音波発振器により発生させた高い周波数の高い電圧の電気信号が、コンバーター内の圧電素子により機械的振動に変換され、その機械的振動が、ブースターにより振幅を調整されて超音波ホーンに伝達され、超音波ホーンの超音波振動が、超音波ホーンとアンビル等との間で加圧した被接合物に印加され、被接合物の部材間に融着が生じる。
このような超音波シール装置による融着は、ホーンとアンビル等との間のクリアランス（隙間）の大小がシール性に大きく影響する。その一方において、パンツ型使い捨ておむつ等においては、パンツ型吸収性物品に多様な機能を持たせるために、外装体の断面構造が複雑化し、それに伴いサイドシール部を形成する部位の層構造も複雑化する傾向にある。例えば、サイドシール部を形成する部位にシートの積層枚数が、相互に異なる２又は３以上の領域が存在する場合もあり、そのような場合、超音波ホーンを一つのみを備えた超音波シール装置を用いてサイドシール部を形成すると、例えば、積層枚数が多い部分を基準にクリアランスを設定した場合、積層枚数が大きい部分では十分なシール強度が得られる一方、積層枚数が少ない部分では十分なシール強度が得られない場合があり、積層枚数が少ない部分を基準にクリアランスを設定した場合、積層枚数が少ない部分では適切なシール強度が得られる一方、積層枚数が多い部分にはサイドシール部に孔が開く等の不都合が生じ易い。 As an ultrasonic sealing apparatus, for example, an apparatus including an ultrasonic oscillator, a converter, a booster, and an ultrasonic horn is widely known. In the ultrasonic sealing apparatus, a high frequency generated by the ultrasonic oscillator is high. The electrical signal of the voltage is converted into mechanical vibration by the piezoelectric element in the converter, and the mechanical vibration is adjusted in amplitude by the booster and transmitted to the ultrasonic horn. The ultrasonic vibration of the ultrasonic horn is converted into the ultrasonic wave. It is applied to the object to be bonded between the horn and the anvil and the like, and fusion occurs between the members of the object to be bonded.
In the fusion by such an ultrasonic sealing device, the size of the clearance (gap) between the horn and the anvil or the like greatly affects the sealing performance. On the other hand, in pants-type disposable diapers, etc., the cross-sectional structure of the exterior body is complicated in order to give the pants-type absorbent article various functions, and accordingly, the layer structure of the part forming the side seal portion is also complicated. It tends to become. For example, there may be two or three or more regions where the number of stacked sheets is different from each other at a site where the side seal portion is formed. In such a case, an ultrasonic seal provided with only one ultrasonic horn. When the side seal part is formed by using the apparatus, for example, when the clearance is set based on a portion where the number of laminated sheets is large, sufficient seal strength can be obtained in a portion where the number of laminated layers is large, but sufficient in a portion where the number of laminated layers is small. In some cases, the seal strength may not be obtained, and when the clearance is set based on the part where the number of laminated sheets is small, an appropriate seal strength can be obtained in the part where the number of laminated sheets is small, while the side seal part is provided in the part where the number of laminated sheets is large Inconveniences such as opening of holes are likely to occur.

従って、本発明の課題は、上述した従来技術の課題を解決し得るパンツ型吸収性物品の製造方法に関する。   Therefore, the subject of this invention is related with the manufacturing method of the underpants type absorbent article which can solve the subject of the prior art mentioned above.

本発明は、吸収性本体と、該吸収性本体を固定している外装体とを備え、腹側部における外装体の両側部と背側部における外装体の両側部とが接合されて形成された一対のサイドシール部を有するパンツ型吸収性物品の製造方法であって、前記パンツ型吸収性物品の連続体に対して超音波ホーンを備えた超音波シール装置により超音波振動を印加して前記サイドシール部を形成するシール工程を具備し、前記パンツ型吸収性物品の連続体は、前記サイドシール部を形成する部位に、前記連続体の搬送方向に直交する方向における一端側から他端側に向かって厚み又はシートの積層枚数が異なる複数の領域を有しており、前記シール工程においては、前記厚み又は前記シートの積層枚数が異なる前記複数の領域に対応させて複数の超音波ホーンを配置し且つ該複数の超音波ホーンの、前記連続体の厚み方向に沿う方向の位置を異ならせた状態下に前記超音波振動を印加する、パンツ型吸収性物品の製造方法を提供するものである。   The present invention includes an absorbent main body and an exterior body that fixes the absorbent main body, and is formed by joining both sides of the exterior body on the abdominal side and both sides of the exterior body on the back side. A method for producing a pant-type absorbent article having a pair of side seal portions, wherein ultrasonic vibration is applied to a continuous body of the pant-type absorbent article by an ultrasonic seal device having an ultrasonic horn. A sealing step for forming the side seal portion, wherein the continuous body of the pant-type absorbent article is formed at a position where the side seal portion is formed from one end side to the other end in a direction orthogonal to the conveying direction of the continuous body. A plurality of ultrasonic horns corresponding to the plurality of regions having different thicknesses or the number of laminated sheets in the sealing step. A method for manufacturing a pant-type absorbent article, wherein the ultrasonic vibration is applied under a state in which the positions of the plurality of ultrasonic horns in the direction along the thickness direction of the continuous body are different from each other. is there.

本発明のパンツ型吸収性物品の製造方法によれば、シール強度及び外観に優れたサイドシール部を有するパンツ型吸収性物品を製造することができる。   According to the method for producing a pant-type absorbent article of the present invention, a pant-type absorbent article having a side seal portion excellent in seal strength and appearance can be produced.

図１は、本発明の一実施態様で製造されるパンツ型吸収性物品の一例であるパンツ型使い捨ておむつを示す斜視図である。FIG. 1 is a perspective view showing a pants-type disposable diaper which is an example of a pants-type absorbent article manufactured in one embodiment of the present invention. 図２は、図１に示すパンツ型使い捨ておむつの展開且つ伸長状態を示す模式的平面図である。FIG. 2 is a schematic plan view showing a developed and extended state of the pants-type disposable diaper shown in FIG. 図３は、図１に示すパンツ型使い捨ておむつのサイドシール部及びその近傍の層構造を模式的に示す断面図である。FIG. 3 is a cross-sectional view schematically showing a side seal portion of the pants-type disposable diaper shown in FIG. 1 and a layer structure in the vicinity thereof. 図４は、本発明の一実施態様であるパンツ型使い捨ておむつの製造工程の概略図である。FIG. 4 is a schematic view of a production process of a pants-type disposable diaper that is one embodiment of the present invention. 図５は、サイドシール部形成装置を構成する複数の超音波シール装置のうちの一つを示す図である。FIG. 5 is a diagram showing one of a plurality of ultrasonic sealing devices constituting the side seal portion forming device. 図６は、サイドシール部の形成に用いるサイドシール部形成装置を示す平面図である。FIG. 6 is a plan view showing a side seal portion forming apparatus used for forming the side seal portion. 図７（ａ）〜図７（ｃ）は、本発明の他の実施態様におけるパンツ型吸収性物品の連続体のサイドシール部の形成予定部位又はパンツ型吸収性物品のサイドシール部又はその近傍の断面図である。Fig.7 (a)-FIG.7 (c) are the formation planned site | part of the side seal part of the continuous body of the underpants type absorbent article in the other embodiment of this invention, the side seal part of the underpants type absorbent article, or its vicinity. FIG.

以下、本発明をその好ましい実施態様に基づき図面を参照しながら説明する。
図１には、本発明の一実施態様で製造されるパンツ型吸収性物品の一例であるパンツ型使い捨ておむつが示されている。
図１に示すパンツ型使い捨ておむつ１（以下、単に「おむつ１」ともいう）は、図１及び図２に示すように、吸収性本体２と、該吸収性本体２を固定している外装体３とを備え、腹側部Ａにおける外装体３の両側部Ａ１，Ａ１と背側部Ｂにおける外装体３の両側部Ｂ１，Ｂ１とが接合されて形成された一対のサイドシール部４，４、ウエスト開口部８及び一対のレッグ開口部９，９が形成されている。外装体３は、非肌当接面側が、おむつ１の外面を形成している。 Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
FIG. 1 shows a pant-type disposable diaper that is an example of a pant-type absorbent article manufactured in one embodiment of the present invention.
A pants-type disposable diaper 1 (hereinafter, also simply referred to as “diaper 1”) shown in FIG. 1 includes an absorbent main body 2 and an exterior body that fixes the absorbent main body 2 as shown in FIGS. 3, and a pair of side seal portions 4, 4 formed by joining both side portions A 1, A 1 of the exterior body 3 on the ventral side A and both sides B 1, B 1 of the exterior body 3 on the back side B A waist opening 8 and a pair of leg openings 9, 9 are formed. The exterior body 3 forms the outer surface of the diaper 1 on the non-skin contact surface side.

おむつ１は、図２に示す如き展開且つ伸長状態の平面視において、着用者の前後方向に相当する縦方向Ｘとこれに直交する横方向Ｙとを有している。おむつ１は、着用時に股下部に配される股下部Ｃ並びにその縦方向Ｘの前後に位置する腹側部Ａ及び背側部Ｂに区分することができる。本明細書において、肌当接面は、パンツ型吸収性物品又はその構成部材（例えば外装体、吸収性本体等）における、着用時に着用者の肌側に向けられる面であり、非肌当接面は、パンツ型吸収性物品又はその構成部材における、着用時に着用者の肌側とは反対側（着衣側）に向けられる面である。おむつ１において、おむつ１の縦方向Ｘは、その構成部材である吸収性本体２及び外装体３の長手方向に一致し、横方向Ｙは、吸収性本体２及び外装体３の幅方向に一致している。   The diaper 1 has a longitudinal direction X corresponding to the wearer's front-rear direction and a lateral direction Y orthogonal to the wearer's front-rear direction in a plan view in an unfolded and extended state as shown in FIG. The diaper 1 can be divided into a crotch part C arranged at the crotch part when worn and a ventral side part A and a back side part B positioned in the longitudinal direction X. In the present specification, the skin contact surface is a surface directed toward the wearer's skin when worn in a pant-type absorbent article or a component thereof (for example, an exterior body, an absorbent main body, etc.), and is non-skin contact The surface is a surface that is directed to the side opposite to the wearer's skin side (clothing side) in the pant-type absorbent article or a component thereof. In the diaper 1, the longitudinal direction X of the diaper 1 coincides with the longitudinal direction of the absorbent main body 2 and the exterior body 3 that are constituent members thereof, and the lateral direction Y is equal to the width direction of the absorbent main body 2 and the exterior body 3. I'm doing it.

吸収性本体２は、図２に示すように、縦方向Ｘの長さが幅方向Ｙの長さよりも長い縦長の形状を有し、肌当接面を形成する表面シート（図示せず）と、非肌当接面を形成する裏面シート（図示せず）と、これら両シート間に介在配置された液保持性の吸収体（図示せず）とを具備している。吸収性本体２は、その長手方向を、展開且つ伸長状態におけるおむつ１の縦方向Ｘに一致させて、外装体３の中央部に固定されている。ここで、展開且つ伸長状態とは、サイドシール部を引き剥がして、おむつを展開状態とし、その展開状態のおむつを、各部の弾性部材を伸長させて、設計寸法（弾性部材の影響を一切排除した状態で平面状に広げたときの寸法と同じ）となるまで拡げた状態をいう。   As shown in FIG. 2, the absorbent main body 2 has a vertically long shape in which the length in the longitudinal direction X is longer than the length in the width direction Y, and a surface sheet (not shown) that forms a skin contact surface. And a back sheet (not shown) that forms a non-skin contact surface, and a liquid-retaining absorbent (not shown) interposed between the two sheets. The absorptive main body 2 is fixed to the central portion of the exterior body 3 such that the longitudinal direction thereof coincides with the longitudinal direction X of the diaper 1 in the expanded and extended state. Here, the expanded and extended state means that the side seal portion is peeled off, the diaper is set in the expanded state, the elastic member of each part is expanded in the expanded diaper, and the design dimensions (the influence of the elastic member is eliminated at all). In this state, it is expanded until it becomes the same size as when expanded in a flat shape.

外装体３は、図１及び２に示すように、おむつ１の外面（外装体３の非肌当接面）を形成する外層シート３１と、該外層シート３１の内面側に配され、おむつ１の内面（外装体３の肌当接面）を形成する内層シート３２と、両シート３１，３２間に接着剤により固定された複数本の糸状又は帯状の弾性部材５，６，７とを含んで構成されている。図１及び図３以外の図においては、弾性部材６の図示を省略してある。両シート３１，３２間は、所定部位において接着剤又はヒートシール等（図示せず）によって接合されている。   As shown in FIGS. 1 and 2, the outer package 3 is arranged on the outer layer sheet 31 that forms the outer surface of the diaper 1 (the non-skin contact surface of the outer package 3), and the inner surface side of the outer layer sheet 31. An inner layer sheet 32 that forms the inner surface (skin contact surface of the exterior body 3), and a plurality of thread-like or belt-like elastic members 5, 6, and 7 fixed between the sheets 31 and 32 with an adhesive. It consists of In the drawings other than FIGS. 1 and 3, the illustration of the elastic member 6 is omitted. The two sheets 31 and 32 are joined to each other at a predetermined site by an adhesive or heat seal (not shown).

おむつ１の腹側部Ａ及び背側部Ｂには、それぞれおむつ幅方向に全域に亘る帯状の端部固定シート３３が配されている。端部固定シート３３は、おむつ１の幅方向Ｙの中央部が、吸収性本体２の縦方向Ｘの端部における肌当接面上に接着剤等の公知の接合手段により固定されており、吸収性本体２の該端部以外の部分の全体又は所定の部位が内層シート３２の肌当接面上に接着剤等の公知の接合手段により固定されている。吸収性本体２は、非肌当接面の全体又は所定の部位が、接着剤等の公知の接合手段により内層シート３２上に固定されているとともに、両端部が、端部固定シート３３によって外装体３に固定されている。
外層シート３１、内層シート３２及び端部固定シート３３としては、使い捨ておむつ等の製造に従来使用されている各種公知のシート材を用いることができるが、肌触りや柔軟性の観点から不織布を用いることが好ましい。不織布としては、各種製法のものを用いることができ、例えば、エアースルー不織布、ヒートロール不織布、スパンレース不織布、スパンボンド不織布、メルトブローン不織布等が挙げられる。不織布を構成する繊維は、合成繊維、特に熱可塑性繊維であることが好ましいが、パルプ繊維等のセルロース系繊維を含んでいても良い。 On the stomach side A and the back side B of the diaper 1, strip-shaped end fixing sheets 33 are arranged over the entire area in the diaper width direction. The center part of the width direction Y of the diaper 1 is being fixed to the skin contact surface in the edge part of the vertical direction X of the absorptive main body 2 by well-known joining means, such as an adhesive agent, the edge fixing sheet 33, The entire part of the absorbent main body 2 other than the end part or a predetermined part is fixed on the skin contact surface of the inner layer sheet 32 by a known joining means such as an adhesive. In the absorbent main body 2, the entire non-skin contact surface or a predetermined portion is fixed on the inner layer sheet 32 by a known bonding means such as an adhesive, and both ends are externally covered by the end fixing sheet 33. It is fixed to the body 3.
As the outer layer sheet 31, the inner layer sheet 32, and the end portion fixing sheet 33, various known sheet materials that are conventionally used in the manufacture of disposable diapers and the like can be used, but a nonwoven fabric is used from the viewpoint of touch and flexibility. Is preferred. As the nonwoven fabric, those of various production methods can be used, and examples thereof include an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, and a melt blown nonwoven fabric. The fibers constituting the nonwoven fabric are preferably synthetic fibers, particularly thermoplastic fibers, but may contain cellulosic fibers such as pulp fibers.

図３は、おむつ１のサイドシール部４及びその近傍の層構造を模式的に示す断面図である。図３に示すように、おむつ１は、ウエスト開口部８の開口端部及びその近傍が８枚のシートが重ねられた８層構造部分３Ａ、前述した端部固定シート３３が配された部分が６枚のシートが重ねられた６層構造部分３Ｃとなっており、８層構造部分３Ａと６層構造部分３Ｃとの間及び６層構造部分３Ｃより股下部Ｃ側が、４枚のシートが重ねられた４層構造部分３Ｂ、３Ｄとなっている。   FIG. 3 is a cross-sectional view schematically showing the side seal portion 4 of the diaper 1 and the layer structure in the vicinity thereof. As shown in FIG. 3, the diaper 1 has an opening end portion of the waist opening portion 8 and its vicinity, an eight-layer structure portion 3 </ b> A in which eight sheets are stacked, and a portion where the above-described end fixing sheet 33 is arranged. It is a 6-layer structure portion 3C in which 6 sheets are stacked, and 4 sheets overlap between the 8-layer structure portion 3A and the 6-layer structure portion 3C and on the crotch C side from the 6-layer structure portion 3C. The four-layer structure portions 3B and 3D are formed.

より詳細には、８層構造部分３Ａは、腹側部Ａ側の外装体を構成する外層シート３１及び内層シート３２が、ウエスト開口部８の開口端部において折り返されて４層となっている腹側部Ａ側の４層構造部分Ａ２と、背側部Ｂ側の外装体を構成する外層シート３１及び内層シート３２が、ウエスト開口部８の開口端部において折り返されて４層となっている背側部Ｂ側の４層構造部分Ｂ２とからなる。６層構造部分３Ｃは、腹側部Ａ側の外層シート３１、内層シート３２及び端部固定シート３３からなる３層構造部分と、背側部Ｂ側の外層シート３１、内層シート３２及び端部固定シート３３からなる３層構造部分とからなる。４層構造部分３Ｂ及び４層構造部分３Ｄは、腹側部Ａ側の外装体を構成する外層シート３１及び内層シート３２からなる２層構造部分と、背側部Ｂ側の外装体を構成する外層シート３１及び内層シート３２からなる２層構造部分とからなる。   More specifically, in the eight-layer structure portion 3A, the outer layer sheet 31 and the inner layer sheet 32 constituting the exterior body on the abdominal side A side are folded back at the opening end of the waist opening 8 to become four layers. The four-layer structure portion A2 on the ventral side A side and the outer layer sheet 31 and the inner layer sheet 32 constituting the exterior body on the back side B side are folded back at the opening end of the waist opening 8 to become four layers. And a four-layer structure portion B2 on the back side B side. The six-layer structure portion 3C includes a three-layer structure portion composed of an outer layer sheet 31, an inner layer sheet 32, and an end fixing sheet 33 on the ventral side A, and an outer layer sheet 31, an inner layer sheet 32, and an end portion on the back side B side. It consists of the three-layer structure part which consists of the fixed sheet | seat 33. FIG. 4 layer structure part 3B and 4 layer structure part 3D comprise the 2 layer structure part which consists of the outer layer sheet 31 and the inner layer sheet | seat 32 which comprise the exterior body of the ventral | abdominal part A side, and the exterior body of the back side part B side. It consists of a two-layer structure part consisting of an outer layer sheet 31 and an inner layer sheet 32.

本発明のパンツ型吸収性物品の製造方法の一実施態様であるおむつ１の製造方法は、図４に示すように、複数の使い捨ておむつが一方向に連なった構成のおむつ連続体１Ａを製造する連続体製造工程Ｓ１と、連続体製造工程で得られたおむつ連続体１Ａのサイドシール部の形成予定部位４０に、超音波ホーンを有する超音波シール装置により超音波振動を印加してサイドシール部４を形成するシール工程Ｓ２と、サイドシール部４を形成したおむつ連続体１Ａ’を、公知の切断手段により切断する分割工程Ｓ３とを有しており、これにより、一対のサイドシール部４，４を有する前記構成のおむつ１が得られる。   The manufacturing method of the diaper 1 which is one embodiment of the manufacturing method of the underpants type absorbent article of this invention manufactures the diaper continuous body 1A of the structure with which several disposable diapers continued in one direction, as shown in FIG. The side seal portion is formed by applying ultrasonic vibrations to the planned formation portion 40 of the side seal portion of the diaper continuous body 1A obtained in the continuum manufacturing step S1 and the continuum manufacturing step using an ultrasonic sealing device having an ultrasonic horn. 4 and a splitting step S3 for cutting the diaper continuous body 1A ′ forming the side seal portion 4 by a known cutting means, whereby a pair of side seal portions 4, The diaper 1 of the said structure which has 4 is obtained.

連続体製造工程Ｓ１においては、公知の方法により、帯状の外層シート３１と帯状の内層シート３２とを、両シート３１，３２間に弾性部材５〜７を伸長状態に介在させた状態に貼り合わせ、帯状シート３１，３２間に複数本の弾性部材５，６，７が伸長状態で配された帯状の外装体３を形成する。ウエスト開口部８の周縁部にウエストギャザーを形成するウエスト部弾性部材５及び胴回り部に胴回りギャザーを形成する胴回り部弾性部材６は、両シート３１，３２の流れ方向と平行に導入し、レッグ部弾性部材７は、両シート３１，３２の流れ方向とは直交して往復運動する公知の揺動ガイド（図示せず）を介して、揺動させながら配置する。図４及び図６においては、胴回り部弾性部材６の図示を省略してある。帯状の外層シート３１及び帯状の内層シート３２には、それらを重ね合わせる前に、両シート３１，３２の何れか一方又は双方の対向する面の所定部位に、ホットメルト型接着剤を塗工しておく。また、必要に応じて、弾性部材プレカット手段（図示せず）を用いて、後述する吸収性本体２を配する位置に対応させて、複数本の胴回り部弾性部材６及び複数本のレッグ部弾性部材７を押圧して、収縮機能が発現されないように個々複数個に分断する。前記弾性部材プレカット手段としては、例えば、特開２００２−２５３６０５号公報に記載の複合伸縮部材の製造方法に用いる弾性部材分断部等が挙げられる。   In the continuum manufacturing step S1, the belt-like outer layer sheet 31 and the belt-like inner layer sheet 32 are bonded to each other in a state where elastic members 5 to 7 are interposed between the sheets 31 and 32 by a known method. The strip-shaped outer package 3 is formed in which a plurality of elastic members 5, 6, and 7 are arranged in an expanded state between the strip-shaped sheets 31 and 32. The waist elastic member 5 for forming waist gathers at the peripheral edge of the waist opening 8 and the waistline elastic member 6 for forming waistline gathers at the waistline are introduced in parallel with the flow direction of both sheets 31, 32, and the leg portion The elastic member 7 is disposed while being oscillated through a known oscillating guide (not shown) that reciprocates perpendicularly to the flow direction of the sheets 31 and 32. 4 and 6, the illustration of the waistline elastic member 6 is omitted. Before the superposition of the belt-shaped outer layer sheet 31 and the belt-shaped inner layer sheet 32, a hot-melt adhesive is applied to a predetermined part of one or both of the sheets 31, 32 facing each other. Keep it. Further, if necessary, a plurality of waistline elastic members 6 and a plurality of leg elastic portions are used by using elastic member pre-cut means (not shown) so as to correspond to positions where the absorbent main body 2 described later is disposed. The member 7 is pressed and divided into a plurality of pieces so that the contraction function is not expressed. Examples of the elastic member precut means include an elastic member dividing portion used in the method for manufacturing a composite elastic member described in JP-A-2002-253605.

次いで、別工程で製造された吸収性本体２を、帯状の外装体３を構成する内層シート３２上に間欠的に供給して固定する。また、端部固定シート３３を、帯状の外装体３を構成する内層シート３２上に連続的に供給し、吸収性本体２の両端部が覆されるように固定する。吸収性本体２及び端部固定シート３３の固定は、それぞれの非肌当接面側に塗布したホットメルト接着剤等の接着剤を介して行うことが好ましい。また、図４に示すように、帯状の外装体３の搬送方向に沿う両側部を折り返して、腹側部側の４層構造部分Ａ２及び背側部側の４層構造部分Ｂ２を形成する。また、吸収性本体２の配置の前又は後に、帯状の外装体３におけるレッグ部弾性部材７で環状に囲まれた環状部の内側にレッグホール９１を形成する。このレッグホール形成工程は、ロータリーカッター、レーザーカッター等の従来からこの種の物品の製造方法に採用されている手法と同様の手法を用いて実施することができる。
次いで、帯状の外装体３を、図４に示すように、吸収性本体２と共に帯状の外装体３の幅方向に２つ折りすることにより、おむつ連続体１Ａが得られる。 Next, the absorbent main body 2 manufactured in a separate process is intermittently supplied and fixed on the inner layer sheet 32 constituting the strip-shaped outer package 3. Moreover, the edge part fixing sheet 33 is continuously supplied on the inner layer sheet 32 which comprises the strip | belt-shaped exterior body 3, and it fixes so that the both ends of the absorptive main body 2 may be covered. It is preferable to fix the absorptive main body 2 and the end fixing sheet 33 via an adhesive such as a hot melt adhesive applied to each non-skin contact surface side. Moreover, as shown in FIG. 4, the both sides along the conveyance direction of the strip | belt-shaped exterior body 3 are return | folded, and the 4 layer structure part A2 by the side of a stomach side and the 4 layer structure part B2 by the side of a back side are formed. In addition, before or after the arrangement of the absorbent main body 2, the leg hole 91 is formed inside the annular portion surrounded by the leg elastic member 7 in the belt-shaped exterior body 3. This leg hole forming step can be carried out by using the same technique as that conventionally used in the manufacturing method of this type of article such as a rotary cutter and a laser cutter.
Next, as shown in FIG. 4, the diaper continuous body 1 </ b> A is obtained by folding the strip-shaped exterior body 3 in the width direction of the strip-shaped exterior body 3 together with the absorbent main body 2.

シール工程Ｓ２においては、こうして製造されたおむつ連続体１Ａのサイドシール部の形成予定部位４０に、超音波ホーン１４とアンビル２０とを有する超音波シール装置１１により超音波振動を印加してサイドシール部４を形成する。図５に示す超音波シール装置１１は、超音波発振器（図示せず）、コンバーター１２、ブースター１３及び超音波ホーン１４を備えている。超音波発振器（図示せず）は、可動台２５上又は可動台２５外に設置されており、コンバーター１２と電気的に接続されており、超音波発振器により発生された周波数１０ｋＨｚ〜１００ｋＨｚ程度の波長の高電圧の電気信号がコンバーター１２に入力される。コンバーター１２は、ピエゾ圧電素子等の圧電素子を内蔵し、超音波発振器から入力された電気信号を、圧電素子により機械的振動に変換する。ブースター１３は、コンバーター１２から発せられた機械的振動の振幅を調整、好ましくは増幅して超音波ホーン１４に伝達する。超音波ホーン１４は、アルミ合金やチタン合金などの金属の塊でできており、使用する周波数で正しく共振するように設計されている。ブースター１３から超音波ホーン１４に伝達された超音波振動は、超音波ホーン１４の内部においても増幅、又は減衰されて、おむつ連続体１Ａのサイドシール部の形成予定部位４０に印加され、形成予定部位４０に存するシートが溶融固化してシート間が接合されサイドシール部４を形成する。
斯かる超音波シール装置１１としては、市販の超音波ホーン、コンバーター、ブースター、超音波発振器を組み合わせて用いることができる。 In the sealing step S <b> 2, ultrasonic vibration is applied to the formation planned portion 40 of the side seal portion of the diaper continuous body 1 </ b> A manufactured in this way by the ultrasonic sealing device 11 having the ultrasonic horn 14 and the anvil 20, thereby side sealing. Part 4 is formed. The ultrasonic sealing device 11 shown in FIG. 5 includes an ultrasonic oscillator (not shown), a converter 12, a booster 13, and an ultrasonic horn 14. The ultrasonic oscillator (not shown) is installed on the movable table 25 or outside the movable table 25, is electrically connected to the converter 12, and has a frequency of about 10 kHz to 100 kHz generated by the ultrasonic oscillator. The high-voltage electrical signal is input to the converter 12. The converter 12 includes a piezoelectric element such as a piezoelectric element, and converts an electric signal input from the ultrasonic oscillator into mechanical vibration by the piezoelectric element. The booster 13 adjusts, preferably amplifies, the amplitude of the mechanical vibration emitted from the converter 12 and transmits it to the ultrasonic horn 14. The ultrasonic horn 14 is made of a lump of metal such as an aluminum alloy or a titanium alloy, and is designed to resonate correctly at the frequency used. The ultrasonic vibration transmitted from the booster 13 to the ultrasonic horn 14 is also amplified or attenuated in the ultrasonic horn 14 and is applied to the formation planned site 40 of the side seal portion of the diaper continuous body 1A. The sheet existing in the region 40 is melted and solidified, and the sheets are joined to form the side seal portion 4.
As such an ultrasonic sealing device 11, a commercially available ultrasonic horn, a converter, a booster, and an ultrasonic oscillator can be used in combination.

超音波ホーン１４により超音波振動を印加する際には、サイドシール部の形成予定部位４０を、超音波ホーン１４の先端面１４ｔとアンビル２０との間で加圧して行うことが好ましい。図５に示すアンビル２０は、矢印ａ方向に回転するアンビルロールであり、周方向の対向する２箇所にシールブロック２１，２１が形成されている。好ましい一例において、超音波ホーン１４の先端面１４ｔは平坦面であるのに対して、シールブロック２１には、凹凸が規則的に形成されており、サイドシール部４内に所定のパターンで強接合部が形成される。   When applying ultrasonic vibration by the ultrasonic horn 14, it is preferable to press the part to be formed 40 of the side seal portion between the tip surface 14 t of the ultrasonic horn 14 and the anvil 20. An anvil 20 shown in FIG. 5 is an anvil roll that rotates in the direction of arrow a, and seal blocks 21 and 21 are formed at two opposite locations in the circumferential direction. In a preferred example, the tip surface 14t of the ultrasonic horn 14 is a flat surface, whereas the seal block 21 is regularly formed with irregularities, and is strongly bonded in a predetermined pattern in the side seal portion 4. Part is formed.

本実施態様の製造方法においては、製造するおむつ１のサイドシール部及びその近傍の層構造に対応して、おむつ連続体１Ａにおけるサイドシール部の形成予定部位４０も、図３に示す層構造と同様の層構造を有している。即ち、サイドシール部の形成予定部位４０も、図４及び図６に示すように、おむつ連続体１Ａの搬送方向ＭＤに直交する方向ＣＤにおける一端Ｐａ側から他端Ｐｂ側に向かって、８層構造部分３Ａ、４層構造部分３Ｂ、６層構造部分３Ｃ及び４層構造部分３Ｄを有している。   In the manufacturing method of the present embodiment, the side seal portion formation planned portion 40 in the diaper continuous body 1A corresponding to the side seal portion of the diaper 1 to be manufactured and the layer structure in the vicinity thereof also has the layer structure shown in FIG. It has a similar layer structure. That is, as shown in FIGS. 4 and 6, the side seal portion formation scheduled portion 40 also has eight layers from the one end Pa side to the other end Pb side in the direction CD orthogonal to the conveyance direction MD of the diaper continuous body 1A. The structure portion 3A includes a four-layer structure portion 3B, a six-layer structure portion 3C, and a four-layer structure portion 3D.

このように、おむつ連続体１Ａのサイドシール部の形成予定部位４０が、シートの積層枚数や厚みが異なる部分を有すると、超音波シール装置による超音波シールにより形成されるサイドシール部４に、積層枚数や厚み差に起因する融着強度の差が生じ易い。そのため、本発明の製造方法の一実施態様においては、以下に説明する方法により、サイドシール部の積層枚数の差や厚み差に起因する融着強度の差を減少させている。   In this way, when the formation planned portion 40 of the side seal part of the diaper continuous body 1A has a portion where the number of stacked sheets and the thickness are different, the side seal part 4 formed by ultrasonic sealing by an ultrasonic sealing device is used. Differences in fusion strength due to the number of stacked layers and thickness differences are likely to occur. Therefore, in one embodiment of the manufacturing method of the present invention, the difference in the fusion strength caused by the difference in the number of laminated side seal portions and the difference in thickness is reduced by the method described below.

即ち、本発明の製造方法の一実施態様においては、図６に示すように、サイドシール部の形成予定部位４０におけるシートの積層枚数が異なる複数の部分３Ａから３Ｄに対応させて、おむつ連続体１Ａの搬送方向に直交する方向ＣＤに、複数の超音波ホーン１４を配置しておき、シートの積層枚数が異なる複数の部分３Ａ〜３Ｄのそれぞれに別個の超音波ホーン１４により超音波振動を印加する。
より詳細に説明すると、本実施態様においては、サイドシール部の形成予定部位４０に、超音波振動を印加してサイドシール部４を形成するサイドシール部形成装置１０として、図６に示すように、おむつ連続体１Ａの搬送方向に直交する方向ＣＤに、複数の超音波シール装置１１Ａ〜１１Ｄを並べたサイドシール装置を用いている。個々の超音波シール装置１１Ａ〜１１Ｄは、それぞれ、コンバーター１２、ブースター１３、超音波ホーン１４及びこれらを一体として、おむつ連続体１Ａの厚み方向に沿う方向Ｔに進退させ、超音波ホーン１４の先端面１４ｔの位置を、該方向Ｔの特定の位置に固定可能な位置制御機構を備えている。位置制御機構は、図５に示すように、スライドシャフトやスライドレール等のスライドガイド１５ａに沿ってスライド移動可能な可動台１５と、可動台１５を進退させ、所定の位置に停止させることのできる駆動機構１６と、駆動機構１６による可動台１５の駆動を制御する制御部（図示せず）を備えている。制御部（図示せず）は、複数の超音波シール装置１１Ａ〜１１Ｄに対して一つ設けられている。制御部（図示せず）は、パーソナルコンピュータやプログラマブルロジックコントローラ（ＰＬＣ）からなり、中央演算部、表示部、入力部、複数の超音波シール装置の駆動機構や各種センサと電気的に接続されたインタフェース部等を備えている。個々の駆動機構１６は、制御部からの指令に基づき可動台１５を前記方向Ｔに進退させる。個々の駆動機構１６としては、エアシリンダ又は油圧シリンダ駆動式アクチュエーター等を用いることもできる。 That is, in one embodiment of the manufacturing method of the present invention, as shown in FIG. 6, a diaper continuous body corresponding to a plurality of portions 3A to 3D in which the number of stacked sheets in the side seal portion formation scheduled portion 40 is different. A plurality of ultrasonic horns 14 are arranged in a direction CD perpendicular to the conveyance direction 1A, and ultrasonic vibrations are applied to the respective portions 3A to 3D having different numbers of sheets by separate ultrasonic horns 14. To do.
More specifically, in the present embodiment, as shown in FIG. 6, as the side seal portion forming apparatus 10 that forms the side seal portion 4 by applying ultrasonic vibration to the formation site 40 of the side seal portion. A side seal device in which a plurality of ultrasonic seal devices 11A to 11D are arranged in a direction CD orthogonal to the conveyance direction of the diaper continuous body 1A is used. Each of the ultrasonic sealing devices 11A to 11D includes the converter 12, the booster 13, the ultrasonic horn 14 and the integrated ultrasonic horn 14 and advances and retracts in the direction T along the thickness direction of the diaper continuous body 1A. A position control mechanism capable of fixing the position of the surface 14t to a specific position in the direction T is provided. As shown in FIG. 5, the position control mechanism can move the movable base 15 slidably along a slide guide 15 a such as a slide shaft or a slide rail, and the movable base 15 to advance and retreat, and stop it at a predetermined position. A drive mechanism 16 and a control unit (not shown) that controls driving of the movable table 15 by the drive mechanism 16 are provided. One control unit (not shown) is provided for the plurality of ultrasonic sealing devices 11A to 11D. The control unit (not shown) includes a personal computer and a programmable logic controller (PLC), and is electrically connected to a central processing unit, a display unit, an input unit, a drive mechanism of various ultrasonic sealing devices, and various sensors. An interface unit and the like are provided. Each drive mechanism 16 moves the movable table 15 forward and backward in the direction T based on a command from the control unit. As each drive mechanism 16, an air cylinder or a hydraulic cylinder drive actuator can be used.

本実施態様のおむつ１の製造方法においては、図６に示すように、複数の超音波ホーン１４Ａ〜１４Ｄの、おむつ連続体１Ａの厚み方向に沿う方向Ｔ（以下、進退方向Ｔともいう）の位置を異ならせた状態下に、超音波振動を印加する。具体的には、サイドシール部の形成予定部位４０における、シートの積層枚数が最大の８層構造部分３Ａに対応させて配置した超音波ホーン１４Ａの先端部の進退方向Ｔの位置を基準位置Ｔａとしたとき、シートの積層枚数が最小の４層構造部分３Ｂ及び３Ｄに対応させて配置した超音波ホーン１４Ｂ，１４Ｄの先端部の進退方向Ｔの位置Ｔｂ，Ｔｄは、前記基準位置Ｔａよりも、おむつ連続体１Ａ側に前進させた位置とする。これにより、超音波ホーン１４Ａとアンビル２０との間に挟んで８層構造部分３Ａに超音波振動を印加する際の、超音波ホーン１４Ａとアンビル２０との間のクリアランス（隙間）よりも、超音波ホーン１４Ｂ，１４Ｄとアンビル２０との間に層構造部分３Ｂ及び３Ｄを挟んで超音波振動を印加する際の、超音波ホーン１４Ｂ，１４Ｄとアンビル２０との間のクリアランス（隙間）が小さくする。   In the manufacturing method of the diaper 1 of this embodiment, as shown in FIG. 6, a plurality of ultrasonic horns 14 </ b> A to 14 </ b> D in a direction T (hereinafter also referred to as advancing / retreating direction T) along the thickness direction of the diaper continuous body 1 </ b> A. Ultrasonic vibration is applied under different positions. Specifically, the position in the advancing / retreating direction T of the tip portion of the ultrasonic horn 14A arranged in correspondence with the eight-layer structure portion 3A having the maximum number of stacked sheets in the side seal portion formation planned portion 40 is defined as the reference position Ta. In this case, the positions Tb and Td in the advancing / retreating direction T of the tip portions of the ultrasonic horns 14B and 14D arranged corresponding to the four-layer structure portions 3B and 3D having the smallest number of laminated sheets are more than the reference position Ta. And a position advanced to the diaper continuous body 1A side. Thereby, it is more than the clearance (gap) between the ultrasonic horn 14A and the anvil 20 when the ultrasonic vibration is applied to the eight-layer structure portion 3A sandwiched between the ultrasonic horn 14A and the anvil 20. Clearance (gap) between the ultrasonic horns 14B and 14D and the anvil 20 when applying ultrasonic vibration with the layer structure portions 3B and 3D sandwiched between the ultrasonic horns 14B and 14D and the anvil 20 is reduced. .

また、シートの積層枚数が最大の８層構造部分３Ａと最小の４層構造部分３Ｂ，３Ｄとの中間であるシートの積層枚数が中間の６層構造部分３Ｃについては、該６層構造部分３Ｃに対応させて配置した超音波ホーン１４Ｃの先端部の進退方向Ｔの位置Ｔｃを、前記基準位置Ｔａと４層構造部分の超音波ホーン１４Ｂ，１４Ｄの先端部の位置Ｔｂ，Ｔｄとの間の位置とする。これにより、超音波ホーン１４Ｃとアンビル２０との間に挟んで６層構造部分３Ｃに超音波振動を印加する際の、超音波ホーン１４Ｃとアンビル２０との間のクリアランス（隙間）が、超音波ホーン１４Ａとアンビル２０との間のクリアランス（隙間）より小さく、超音波ホーン１４Ｂ，１４Ｄとアンビル２０との間のクリアランス（隙間）よりも大きくなる。   Further, for the 6-layer structure portion 3C having an intermediate number of sheets stacked between the maximum 8-layer structure portion 3A and the minimum 4-layer structure portions 3B and 3D, the 6-layer structure portion 3C The position Tc in the advancing / retreating direction T of the tip portion of the ultrasonic horn 14C arranged corresponding to is between the reference position Ta and the positions Tb, Td of the tip portions of the ultrasonic horns 14B, 14D of the four-layer structure portion. Position. Thereby, the clearance (gap) between the ultrasonic horn 14C and the anvil 20 when applying ultrasonic vibration to the six-layer structure portion 3C sandwiched between the ultrasonic horn 14C and the anvil 20 is ultrasonic. It is smaller than the clearance (gap) between the horn 14A and the anvil 20 and larger than the clearance (gap) between the ultrasonic horns 14B and 14D and the anvil 20.

本実施態様の製造方法によれば、サイドシール部の形成予定部位４０の層構造に応じた超音波シール加工が可能であり、例えば、上述のようにして、シートの積層枚数が最大の部分における超音波ホーン１４Ａとアンビル２０とのクリアランスよりも、シートの積層枚数がそれより少ない部分における超音波ホーン１４Ｂ〜１４Ｄとアンビル２０とのクリアランスを小さくすることで、シートの積層枚数が最大の部分とそれ以下の部分との両方を適切なシール強度が得られ、またシートの積層枚数が最大の部分に意図しない孔が形成されることも防止される。
本実施態様の製造方法によれば、このようにして、シール強度及び外観に優れたサイドシール部を有するおむつ１（パンツ型吸収性物品）を製造することができる。 According to the manufacturing method of this embodiment, it is possible to perform ultrasonic sealing processing according to the layer structure of the part 40 where the side seal portion is to be formed. For example, as described above, in the portion where the number of stacked sheets is maximum. By reducing the clearance between the ultrasonic horns 14B to 14D and the anvil 20 in the portion where the number of stacked sheets is smaller than the clearance between the ultrasonic horn 14A and the anvil 20, the portion where the number of stacked sheets is the largest. Appropriate sealing strength can be obtained for both of the lower portions and unintended holes can be prevented from being formed in the portion where the number of stacked sheets is maximum.
According to the manufacturing method of this embodiment, the diaper 1 (pants-type absorbent article) having a side seal portion excellent in sealing strength and appearance can be manufactured in this way.

図６に示すサイドシール部形成装置１０においては、超音波シール装置１１Ａ〜１１Ｄの４つの超音波ホーン１４Ａ〜１４Ｄは、共通する一つのアンビル２０を有し、おむつ連続体１Ａの搬送方向ＭＤにおける同位置に配置されていたが、複数の超音波ホーンを、おむつ連続体１Ａの搬送方向ＭＤにおける相異なる位置に配置することも、超音波ホーンどうしの干渉を防止したり、サイドシール部を縦方向に隙間なく形成することができること等から好ましい。例えば、４つの超音波ホーン１４Ａ〜１４Ｄのうちの一つ置きの２つの超音波ホーン１４Ｂ，１４Ｄを残りの超音波ホーン１４Ａ，１４Ｃより搬送方向の下流又は上流側に配置することも好ましい。また、超音波ホーン１４を２個のみ配置する場合においても、一方の超音波ホーンを他方の超音波ホーンよりも、おむつ連続体１Ａの搬送方向の下流又は上流側に配することできる。このように、複数の超音波ホーンの位置を、搬送方向ＭＤの異なる位置に配置する場合、一つのアンビルロールの周囲に、複数の超音波ホーンを、アンビルロールの周方向の位置を異ならせて配置することも好ましい。   In the side seal part forming apparatus 10 shown in FIG. 6, the four ultrasonic horns 14A to 14D of the ultrasonic seal apparatuses 11A to 11D have one common anvil 20 in the conveyance direction MD of the diaper continuous body 1A. Although arranged at the same position, arranging a plurality of ultrasonic horns at different positions in the conveying direction MD of the diaper continuous body 1A can also prevent interference between the ultrasonic horns, It is preferable because it can be formed without gaps in the direction. For example, it is also preferable that every other two ultrasonic horns 14B and 14D among the four ultrasonic horns 14A to 14D are arranged downstream or upstream in the transport direction from the remaining ultrasonic horns 14A and 14C. Moreover, also when arrange | positioning only two ultrasonic horns 14, one ultrasonic horn can be distribute | arranged to the downstream or upstream of the conveyance direction of the diaper continuous body 1A rather than the other ultrasonic horn. Thus, when arrange | positioning the position of several ultrasonic horn in the position where conveyance direction MD differs, several ultrasonic horns are made to differ in the circumferential direction position of an anvil roll around one anvil roll. It is also preferable to arrange them.

また、本発明においては、パンツ型吸収性物品の連続体の搬送方向に直交する方向の位置を検知し、検知した位置に基づき複数の超音波ホーンの同方向の位置を調整しながら超音波振動を印加することも好ましい。おむつ連続体１Ａの厚みやシートの積層枚数が異なる複数の部分と、それぞれに対応して設けた超音波ホーンの位置とを一致させることで、サイドシール部の形成予定部位４０の層構造に応じた超音波シール加工を確実に行うことができる。
例えば、前述した超音波シール装置１１Ａ〜１１Ｄの全てを、図示しない駆動機構により、おむつ連続体１Ａの搬送方向に直交する方向ＣＤにスライド移動可能な可動台２５上に設置するとともに、おむつ連続体１Ａの搬送経路における図４に符号２６に示す位置におむつ連続体１Ａの側縁の位置の検知手段を設置し、検知手段により検出したおむつ連続体１Ａの側縁の位置が、予め設定した適正位置から図４中の上側又は下側方向にずれているときには、前述した制御部が、該側縁の位置がずれた分だけ可動台２５が同方向に移動するように駆動機構を駆動するようにすることも好ましい。
おむつ連続体１Ａの側縁の検知手段としては、側縁の位置を検知可能な任意の手段を用いることができ、例えば、レーザー式センサ、光電式センサ、超音波式センサ等を用いることができる。
なお、おむつ連続体１Ａの側縁の位置を検出する位置は、サイドシール部を形成する位置より下流であっても良い。フィードバック制御により、おむつ連続体１Ａの厚みやシートの積層枚数が異なる複数の部分と、それぞれに対応して設けた超音波ホーンの位置とを一致させることによっても、サイドシール部の形成予定部位４０の層構造に応じた超音波シール加工を確実に行うことができる。 Further, in the present invention, the ultrasonic vibration is detected while detecting the position in the direction orthogonal to the conveyance direction of the continuous body of the pant-type absorbent article and adjusting the position in the same direction of the plurality of ultrasonic horns based on the detected position. It is also preferable to apply. According to the layer structure of the formation part 40 of the side seal part by matching the position of the ultrasonic horn provided corresponding to each of a plurality of portions having different thicknesses and the number of laminated sheets of the diaper continuous body 1A. Ultrasonic sealing can be reliably performed.
For example, all of the ultrasonic sealing devices 11A to 11D described above are installed on the movable table 25 that can be slid in a direction CD orthogonal to the conveying direction of the diaper continuous body 1A by a driving mechanism (not shown), and the diaper continuous body The detection means for the position of the side edge of the diaper continuous body 1A is installed at the position indicated by reference numeral 26 in FIG. 4 in the 1A conveyance path, and the position of the side edge of the diaper continuous body 1A detected by the detection means is appropriately set in advance. When the position is displaced in the upper or lower direction in FIG. 4, the control unit described above drives the drive mechanism so that the movable base 25 moves in the same direction by the amount of displacement of the side edge. It is also preferable to make it.
As a means for detecting the side edge of the diaper continuous body 1A, any means capable of detecting the position of the side edge can be used. For example, a laser sensor, a photoelectric sensor, an ultrasonic sensor, or the like can be used. .
In addition, the position which detects the position of the side edge of the diaper continuous body 1A may be downstream from the position where the side seal portion is formed. By forming the diaper continuous body 1 </ b> A in different thicknesses and the number of stacked sheets, the side portions of the side seal portion are scheduled to be formed by matching the positions of the ultrasonic horns corresponding to the portions. Ultrasonic sealing according to the layer structure can be reliably performed.

また、前述したおむつ連続体１Ａの搬送経路の途中に、おむつ連続体１Ａの幅方向における厚みの検知手段を配置し、厚みの検知手段により検出されるデータに基づき、例えば、前述した８層構造部分３Ａと、６層構造部分３Ｃと、４層構造部分３Ｂ，３Ｄの厚み差を検知し、この検知した厚み差に基づき、超音波ホーン１４Ａ〜１４Ｄの位置を、図６に示すような位置関係に制御して、その各部に超音波振動を印加することも好ましい。
厚みの検知手段としては、静電容量式センサ、レーザー式センサ、超音波式センサ等を用いることができる。
おむつ連続体１Ａの幅方向の厚みを検出し、厚みが異なる複数の部分ごとに超音波ホーン１４とアンビル２０との間のクリアンランスを変えて、超音波振動を印加することで、相対的に厚みが大きい部分と相対的に厚みが小さい部分と両者に適切な超音波シールを行うことができ、サイドシール部に適切なシール強度が得られ、厚みの大きい部分に意図しない孔が形成されることも防止される。 Further, a thickness detecting means in the width direction of the diaper continuous body 1A is arranged in the middle of the conveyance path of the diaper continuous body 1A, and the above-described eight-layer structure, for example, based on data detected by the thickness detecting means A thickness difference between the portion 3A, the six-layer structure portion 3C, and the four-layer structure portions 3B and 3D is detected, and based on the detected thickness difference, the positions of the ultrasonic horns 14A to 14D are as shown in FIG. It is also preferable to apply ultrasonic vibration to each part by controlling the relationship.
As the thickness detecting means, a capacitance type sensor, a laser type sensor, an ultrasonic type sensor or the like can be used.
By detecting the thickness in the width direction of the diaper continuum 1A, changing the clearance between the ultrasonic horn 14 and the anvil 20 for each of a plurality of portions having different thicknesses, and applying ultrasonic vibration, Appropriate ultrasonic sealing can be performed on both the thick part and the relatively thin part, and an appropriate seal strength can be obtained in the side seal part, and an unintended hole is formed in the thick part. This is also prevented.

分割工程Ｓ３においては、以上のようにしてサイドシール部４を形成したおむつ連続体１Ａ’を、公知の切断手段により切断して、一対のサイドシール部４，４を有するおむつ１を得る。なお、サイドシール部の形成予定部位４０には、分割工程後に、異なるおむつのサイドシール部となる２本のサイドシール部４ａ，４ｂを同時に形成しても良いし、分割工程後に、異なるおむつのサイドシール部となる２本のサイドシール部４ａ，４ｂを、前述したサイドシール部形成装置１０を複数用いて順次形成しても良い。   In the dividing step S3, the diaper continuous body 1A 'having the side seal part 4 formed as described above is cut by a known cutting means to obtain the diaper 1 having a pair of side seal parts 4 and 4. It should be noted that two side seal portions 4a and 4b, which become side seal portions of different diapers, may be formed at the side seal portion formation scheduled portion 40 at the same time after the division step, or different diapers after the division step. The two side seal portions 4a and 4b serving as the side seal portions may be sequentially formed by using a plurality of the side seal portion forming devices 10 described above.

以上、本発明をその実施態様に基づいて説明したが、本発明は、上述した実施態様に制限されることなく適宜変更が可能である。
例えば、前述した実施態様においては、おむつ連続体１Ａが、サイドシール部の形成予定部位４０に、シートの積層枚数が異なる複数の部位３Ａ〜３Ｄを有していたが、シートの積層枚数は同じで厚みが異なる複数の部位を有していても良く、シール工程において、その厚みが異なる複数の部分に対応させて複数の超音波ホーンを配置し且つ該複数の超音波ホーンの、連続体の厚み方向に沿う方向の位置を異ならせた状態下に超音波振動を印加しても良い。 As mentioned above, although this invention was demonstrated based on the embodiment, this invention can be suitably changed without being restrict | limited to the embodiment mentioned above.
For example, in the embodiment described above, the diaper continuous body 1A has the plurality of portions 3A to 3D in which the number of stacked sheets is different in the portion 40 where the side seal portion is to be formed, but the number of stacked sheets is the same. In the sealing process, a plurality of ultrasonic horns are arranged corresponding to a plurality of portions having different thicknesses, and the plurality of ultrasonic horns are continuously formed. You may apply an ultrasonic vibration in the state where the position of the direction along a thickness direction was varied.

また、前述した実施態様においては、サイドシール部の形成予定部位４０における、４つの部分、即ち８層構造部分３Ａ、４層構造部分３Ｂ、６層構造部分３Ｃ及び４層構造部分３Ｄのそれぞれに対応させて４つの超音波ホーン１４Ａ〜１４Ｄを用いたが、８層構造部分３Ａに対応させて一つの超音波ホーン１４Ａを用いる一方、他の部分３Ｂ〜３Ｄについては共通する一つの一つの超音波ホーン１４を用いても良い。また、４つの部分３Ａ〜３Ｄのそれぞれに対応させて４つの超音波ホーン１４Ａ〜１４Ｄを用いる一方、３つの部分３Ｂ〜３Ｄに用いる超音波ホーンの進退方向Ｔの位置Ｔｂ〜Ｔｄは、前記基準位置Ｔａよりも後退した同じ位置としても良い。 In the above-described embodiment, each of the four portions in the side seal portion formation planned portion 40, that is, the 8-layer structure portion 3A, the 4-layer structure portion 3B, the 6-layer structure portion 3C, and the 4-layer structure portion 3D is provided. Although using four ultrasonic horn 14A~14D to correspond, 8 So構forming portion 3A while using a single ultrasonic horn 14A in correspondence with, one by one in common for other parts 3B~3D An ultrasonic horn 14 may be used. Further, four ultrasonic horns 14A to 14D are used corresponding to each of the four portions 3A to 3D, while the positions Tb to Td in the advancing and retreating direction T of the ultrasonic horns used for the three portions 3B to 3D are the reference. It is good also as the same position retreated from position Ta.

また、本発明におけるパンツ型吸収性物品の連続体又はパンツ型吸収性物品は、サイドシール部の形成予定部位及びサイドシール部が、図７に示す各態様で重ねられた４〜８層構造部分を有するものであっても良い。
図７（ａ）に示すパンツ型吸収性物品の連続体又はパンツ型吸収性物品は、サイドシール部の形成予定部位及びサイドシール部に、腹側部Ａ側の外装体と背側部Ｂ側の外装体とが重ね合わされた形成された、６層構造部分３Ａと４層構造部分３Ｂとを有している。
図７（ｂ）に示すパンツ型吸収性物品の連続体又はパンツ型吸収性物品は、サイドシール部の形成予定部位及びサイドシール部に、腹側部Ａ側の外装体と背側部Ｂ側の外装体とが重ね合わされた形成された、８層構造部分３Ａと６層構造部分３Ｃと４層構造部分３Ｂとを有している。
図７（ｃ）に示すパンツ型吸収性物品の連続体又はパンツ型吸収性物品は、サイドシール部の形成予定部位及びサイドシール部に、腹側部Ａ側の外装体と背側部Ｂ側の外装体とが重ね合わされた形成された、４層構造部分３Ｄと６層構造部分３Ｅと第２の４層構造部分３Ｂとを有している。 In addition, the continuous body of the pant-type absorbent article or the pant-type absorbent article in the present invention is a 4-8 layer structure part in which the formation site of the side seal part and the side seal part are overlapped in each mode shown in FIG. It may have.
The continuous body of the pants-type absorbent article or the pants-type absorbent article shown in FIG. 6-layer structure portion 3A and 4-layer structure portion 3B, which are formed by overlapping the outer packaging body.
The continuous body of the pants-type absorbent article or the pants-type absorbent article shown in FIG. 7B is provided with the exterior body on the abdominal side A side and the back side B side on the site where the side seal part is to be formed and the side seal part. The outer package body has an eight-layer structure portion 3A, a six-layer structure portion 3C, and a four-layer structure portion 3B.
The continuous body of the pants-type absorbent article or the pants-type absorbent article shown in FIG. 7 (c) has an exterior body on the abdominal side A side and a back side B side on the part where the side seal part is to be formed and the side seal part. The four-layer structure portion 3D, the six-layer structure portion 3E, and the second four-layer structure portion 3B, which are formed by superimposing the outer packaging body, are formed.

また、本発明におけるパンツ型吸収性物品は、パンツ型使い捨ておむつに限られず、パンツ型の生理用ナプキンであっても良く、また、着用物品の外面を形成する外装体を具備する一方、吸収性本体を具備しない、おむつカバー等であっても良い。
上述した一の実施形態における説明省略部分及び一の実施形態のみが有する要件は、それぞれ他の実施形態に適宜適用することができ、また、各実施形態における要件は、適宜、実施形態間で相互に置換可能である。 In addition, the pant-type absorbent article in the present invention is not limited to a pant-type disposable diaper, and may be a pant-type sanitary napkin, and also has an outer package that forms the outer surface of the worn article. It may be a diaper cover or the like that does not include a main body.
The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

１ パンツ型使い捨ておむつ（パンツ型吸収性物品）
Ａ 腹側部
Ｂ 背側部
Ｃ 股下部
１Ａ おむつ連続体（パンツ型吸収性物品の連続体）
４０ サイドシール部を形成する部位（サイドシール部の形成予定部位）
２ 吸収性本体
３ 外装体
３１ 外層シート
３２ 内層シート
３３ 端部固定シート
３Ａ パンツ型吸収性物品又はサイドシール部の形成予定部位の８層構造部分
３Ｂ、３Ｄ パンツ型吸収性物品又はサイドシール部の形成予定部位の４層構造部分
３Ｃ パンツ型吸収性物品又はサイドシール部の形成予定部位の４層構造部分
４ サイドシール部
５ ウエスト部弾性部材
６ 胴回り部弾性部材
７ レッグ部弾性部材
８ ウエスト開口部
９ レッグ開口部
１０ サイドシール部形成装置
１１，１１Ａ〜１１Ｄ 超音波シール装置
１２ コンバーター
１３ ブースター
１４ 超音波ホーン
１４ｔ 超音波ホーンの先端面
１５ 可動台
１６ 駆動機構
２０ アンビル
２１ シールブロック
２５ 可動台
1 Pants-type disposable diapers (pants-type absorbent articles)
A ventral part B dorsal part C inseam 1A diaper continuum (continuous body of pants-type absorbent article)
40 Site where the side seal part is formed (Scheduled part of the side seal part)
DESCRIPTION OF SYMBOLS 2 Absorbent main body 3 Exterior body 31 Outer layer sheet 32 Inner layer sheet 33 End part fixing sheet 3A 8 layer structure part of the formation plan part of a pants type absorbent article or a side seal part 3B, 3D of a pant type absorbent article or a side seal part 4 layer structure part of the planned formation site 3C 4 layer structure part of the planned formation part of the pant-type absorbent article or the side seal part 4 Side seal part 5 Waist elastic member 6 Girth elastic member 7 Leg elastic member 8 Waist opening DESCRIPTION OF SYMBOLS 9 Leg opening part 10 Side seal part formation apparatus 11, 11A-11D Ultrasonic sealing apparatus 12 Converter 13 Booster 14 Ultrasonic horn 14t End face of ultrasonic horn 15 Movable stand 16 Drive mechanism 20 Anvil 21 Seal block 25 Movable stand

Claims (4)

吸収性本体と、該吸収性本体を固定している外装体とを備え、腹側部における外装体の両側部と背側部における外装体の両側部とが接合されて形成された一対のサイドシール部を有するパンツ型吸収性物品の製造方法であって、
前記パンツ型吸収性物品の連続体に対して超音波ホーンとアンビルとを備えた超音波シール装置により超音波振動を印加して前記サイドシール部を形成するシール工程を具備し、
前記パンツ型吸収性物品の連続体は、前記サイドシール部を形成する部位に、前記連続体の搬送方向に直交する方向における一端側から他端側に向かって厚み又はシートの積層枚数が異なる複数の領域を有しており、
前記シール工程においては、前記厚み又は前記シートの積層枚数が異なる前記複数の領域に対応させて複数の超音波ホーンを配置し且つ該複数の超音波ホーンの、前記連続体の厚み方向に沿う方向の位置を異ならせ、前記厚みが大きい又は前記シートの積層枚数が多い領域に対応する前記超音波ホーンと前記アンビルとのクリアランスよりも、前記厚みが小さい又は前記シートの積層枚数が少ない領域に対応する前記超音波ホーンと前記アンビルとのクリアランスを小さくした状態下に前記超音波振動を印加する、パンツ型吸収性物品の製造方法。 A pair of sides formed by joining an absorbent main body and an exterior body fixing the absorbent main body, and joining both sides of the exterior body on the abdominal side and both sides of the exterior body on the back side A method for producing a pants-type absorbent article having a seal part,
Including a sealing step of forming the side seal part by applying ultrasonic vibration to the continuous body of the pant-type absorbent article by an ultrasonic sealing device including an ultrasonic horn and an anvil;
The continuous body of the pant-type absorbent article has a plurality of different thicknesses or number of stacked sheets from one end side to the other end side in a direction orthogonal to the conveying direction of the continuous body at a portion forming the side seal portion. And has an area of
In the sealing step, a plurality of ultrasonic horns are arranged corresponding to the plurality of regions having different thicknesses or the number of stacked sheets, and the direction of the plurality of ultrasonic horns along the thickness direction of the continuous body Corresponding to the region where the thickness is smaller or the number of stacked sheets is smaller than the clearance between the ultrasonic horn and the anvil corresponding to the region where the thickness is large or the number of stacked sheets is large. A method for producing a pant-type absorbent article, wherein the ultrasonic vibration is applied in a state where a clearance between the ultrasonic horn and the anvil is reduced . 前記複数の超音波ホーンを、前記連続体の搬送方向における相異なる位置に配置する、請求項１に記載のパンツ型吸収性物品の製造方法。   The manufacturing method of the underpants type absorbent article of Claim 1 which arrange | positions these ultrasonic horns in the position which differs in the conveyance direction of the said continuous body. 前記連続体の搬送方向に直交する方向の位置を検知し、検知した位置に基づき前記超音波ホーンの同方向の位置を調整しながら超音波振動を印加する、請求項１又は２に記載のパンツ型吸収性物品の製造方法。   The underpants according to claim 1 or 2, wherein a position in a direction perpendicular to a conveying direction of the continuous body is detected, and ultrasonic vibration is applied while adjusting a position in the same direction of the ultrasonic horn based on the detected position. Manufacturing method of mold absorbent article. 前記パンツ型吸収性物品の連続体の搬送方向に直交する方向における複数の領域の厚みを測定して該方向における厚み差を検知し、検知した厚み差に基づき、前記超音波ホーンの、該連続体の厚み方向に沿う方向の位置を調整しながら超音波振動を印加する、請求項１〜３の何れか１項に記載のパンツ型吸収性物品の製造方法。
Measure the thickness of a plurality of regions in the direction orthogonal to the conveying direction of the continuous body of the pants-type absorbent article to detect the thickness difference in the direction, and based on the detected thickness difference, the ultrasonic horn of the continuous The manufacturing method of the underpants type absorbent article of any one of Claims 1-3 which apply an ultrasonic vibration, adjusting the position of the direction along the thickness direction of a body.
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