JP4818083B2 - HEAT SEALING DEVICE AND METHOD FOR MANUFACTURING SEALED ARTICLE - Google Patents

Description

  The present invention relates to a heat sealing apparatus for heat-sealing a workpiece and a method for manufacturing a sealed article.

In the manufacturing process of articles, a rotary processing device equipped with a processing roll and an anvil roll is used, and each work is passed between each roll while rotating each roll, so that cutting and sealing are performed. Various processes such as the above are often performed. In such a rotary processing apparatus, when each workpiece is processed, each roll repeatedly presses and contacts the workpiece while being contacted / separated. There are problems such as causing damage and variations in processing performed by each roll. For this reason, like the technique of the following patent document 1, it aims at solving the said subject by attaching a bearer to the both sides of the width direction of the peripheral surface part in a processing roll or an anvil roll.

JP-T-2002-501127

  However, when the processing to be performed on the workpiece is heat sealing, the roll is heated and thermally expanded, and the deformation amount in the normal direction becomes large at the center portion of the rotating shaft. It was found that the impact could not be sufficiently suppressed by the attachment alone.

  Therefore, an object of the present invention is to provide a heat sealing apparatus capable of suppressing the occurrence of impact between the rolls during heat sealing, and a method for manufacturing a sealed article using the same.

  The present invention comprises a processing roll having a heat seal processing portion on a peripheral surface portion, and an anvil roll having an anvil portion for receiving the processing portion, and when each roll is rotating, the processing portion and the A heat sealing apparatus that heat-seals a workpiece supplied between an anvil portion and the processing portion is located on both sides in the width direction of the processing roll and does not have the heat seal pattern. A bearer portion and a pattern portion located between the bearer portions and having the heat seal pattern, wherein at least the supply-side edge portions of the workpiece in the pattern portion are both side portions in the width direction of the work roll. The object is achieved by providing a heat seal device provided so that the pattern width in the circumferential direction of the pattern portion becomes narrower from the inside toward the inside. Those were.

  Moreover, this invention supplies the workpiece between the said process part and the said anvil part, rotating the said each roll of the said heat seal apparatus of this invention, The process of giving a heat seal to this workpiece. The manufacturing method of the sealing processed article which has is provided.

  According to the heat sealing apparatus of the present invention, damage to the apparatus itself and the workpiece can be suppressed during heat sealing. Moreover, according to the manufacturing method of the to-be-sealed article of this invention, the to-be-sealed article which the damage accompanying heat sealing processing was suppressed low can be manufactured suitably.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
1 and 2 schematically show an embodiment of a heat seal apparatus (hereinafter also referred to as an apparatus) of the present invention. In FIG. 1, reference numeral 1 denotes an apparatus, 100 denotes a workpiece, and an arrow F denotes a flow direction of the workpiece.

  As shown in FIG. 1, the apparatus 1 according to the present embodiment includes a processing roll (hereinafter also simply referred to as a roll) 2 having a heat sealing processing section 20 on a peripheral surface section, and an anvil section 30 that receives the processing section 20. An anvil roll (hereinafter also referred to simply as a roll) 3 having a workpiece, and a workpiece supplied between the processing section 20 and the anvil section 30 when the rolls 2 and 3 are rotating. 100 is an apparatus for intermittently heat-sealing 100. The processing part 20 and the anvil part 30 are attached to the peripheral surface part of the roll main body (not shown) of the rolls 2 and 3. The processing part 20 and the anvil part 30 of the rolls 2 and 3 are made of a metal block such as an aluminum alloy or steel.

  As shown in FIG. 2, the processing unit 20 is positioned between the bearer portions 20 </ b> A located on both sides in the width direction of the roll 2 and both the bearer portions 20 </ b> A in the width direction of the roll 2, And a pattern portion 20B.

  The bearer portion 20A is provided in a flange-like form that protrudes along the circumference of the roll 2 of the pattern portion 20B. The protruding flange-shaped portion of the bearer portion 20A comes into contact before the workpiece 100 is heat-sealed at the pattern portion, so that the rolls 2 and 3 are in contact with each other at the time of heat-sealing. The influence of impact can be further suppressed. The boundary between the bearer portion 20A and the pattern portion 20B is chamfered (trimmed) in a curved shape, and the influence of the impact is further alleviated.

  In the apparatus 1 of the present embodiment, as shown in FIG. 2, the supply-side edge portion 201 </ b> B and the discharge-side edge portion 202 </ b> B of the workpiece 100 in the pattern portion 20 </ b> B are directed inward from both widthwise side portions of the roll 2. The pattern portion 20B is gently curved so that the pattern width WP in the circumferential direction is gradually narrowed, and the pattern portion 20B is provided so that the pattern width WP is narrowest at the center in the width direction of the roll 2. It has been. For this reason, when heat sealing is performed with the roll 2 (and the roll 3), the amount of thermal expansion deformation of the central portion in the width direction from the width direction both sides of the roll 2 (and 3) with a small amount of thermal expansion deformation in the pattern portion is small. The pattern part of the processing part 20 (and the anvil part 30) gradually heat-seals the workpiece 100 toward the larger number. Therefore, the impact received at the time of the contact of the pattern parts of a roll can be reduced. Conversely, when the workpiece 100 is discharged after the heat sealing process by the apparatus 1, the thermal expansion of both sides of the roll gradually starts from the center in the width direction of the roll 2 (and the roll 3) with a large amount of thermal expansion deformation. Since the pattern portions are gradually separated from each other toward the direction with a smaller amount of deformation, the impact received when the pattern portions of the roll are separated can be reduced.

  The heat seal pattern in the pattern portion 20B is a stripe-shaped pattern in which grooves along the circumference of the roll 2 are formed at predetermined intervals, and each of the plurality of ridges 200 (each ridge has a trapezoidal horizontal cross section). . The height (the groove depth) H200 of the protrusion 200 in the pattern portion 20B is set according to the impact force applied to the pattern portion during processing. In consideration of the material strength of the pattern, 0.1 to 5 mm is preferable, and 0.5 to 3 mm is preferable. The width W200 of the ridge 200 is set according to the material property of the workpiece. Considering the bonding strength and texture of the workpiece, 0.1 to 3 mm is preferable, and 0.4 to 2 mm is preferable. The distance D200 between the protrusions 200 is set according to the material physical properties of the workpiece. Considering the bonding strength and texture of the workpiece, 0.3 to 5 mm is preferable, and 0.3 to 3 mm is preferable.

  When the processing unit 20 is a plan view of the bearer unit 20A and the pattern unit 20B, the supply-side edge unit 201 of the workpiece 100 and the discharge-side edge unit 202 of the workpiece 100 are in relation to the rotation axis R2 of the roll 2. Are line symmetrical. Also, the bearer portion 20 </ b> A and the pattern portion 20 </ b> B are provided symmetrically with respect to the center line in the width direction of the roll 2.

In the apparatus 1 of the present embodiment, the anvil portion 30 of the roll 3 is provided in the same manner as when the processing portion 20 of the roll 2 is arranged in an inverted manner. In addition, the reference numerals are attached and detailed description thereof is omitted. Since anvil unit 30 is provided similarly to the processing unit 20 that that are arranged inverted, supply-side edge portion 301B and the discharge-side edge portion 302B of the workpiece 100 in the anvil portion 30 of the roll 3, It is the same shape as the supply side edge part 201B and the discharge side edge part 202B in the processing part 20. Therefore, when the rolls 2 and 3 align the anvil part 30 and the processing part 20 and are driven to rotate synchronously, the inverted bearer parts 30A and 20A and the pattern parts 30B and 20B are replaced by the workpiece. Butt through 100.

  Although not shown in the drawing, the rolls 2 and 3 are provided with heating means, and heat is transmitted to the processing part 20 and the anvil part 30 of the rolls 2 and 3 by heat conduction from the heating means. It is provided as follows. In addition, the rolls 2 and 3 are provided so as to rotate in synchronization with each other by transmitting a driving force from a driving means (not shown) to the rotary shafts R2 and R3.

  Further, the apparatus 1 includes a control unit (not shown), and the control unit controls the driving unit and the heating unit to control the rolls 2 and 3 to a predetermined rotational speed and temperature.

In the apparatus 1 configured as described above, when the workpiece 100 is heat-sealed through the pattern portions 20B and 30B of the processing portion 20 and the anvil portion 30, the amount of thermal expansion deformation in each pattern portion. Each of the pattern portions of the processed portion 20 and the anvil portion 30 is gradually heat-sealed to the workpiece 100 from the both side portions in the width direction of the rolls 2 and 3 having a small amount toward the direction where the amount of thermal expansion deformation at the center portion in the width direction is large. Therefore, the impact received at the time of contact between the pattern parts of each roll can be reduced. Conversely, when the workpiece 100 is discharged after the heat sealing process by the apparatus 1, the amount of thermal expansion and deformation at the both sides of each roll gradually from the center in the width direction of the rolls 2 and 3 having a large amount of thermal expansion and deformation. Since the pattern portions are gradually separated from each other toward the side with less, the impact received when the pattern portions of the rolls are separated can be reduced. Therefore, it is possible to suppress the damage to the surface of the workpiece 100 at the time of discharging is performed a heat sheet Lumpur apparatus 1. Moreover, since the pattern width WP of each pattern part is provided so as to be narrow as described above, like the rolls 2 and 3, the area (line length) in which the pattern parts come into contact is small (short), The seal strength is high at both ends of the pattern portion where the stress becomes high (both ends at the joined portion of the workpiece), and the area (line length) that the upper and lower rolls 2 and 3 are in contact with increases (longer), The seal strength is lowered at a portion where the stress is low. For this reason, the joint formed in the workpiece 100 to be obtained is provided with a lower joint strength at the center than at both ends of the joint width W100. Therefore, it is possible to suppress a decrease in the texture of the workpiece 100 due to the joining.

  Next, the manufacturing method of the sealed article of the present invention will be described based on a preferred embodiment applied to a manufacturing method of a pants-type disposable diaper (pants-type wearing article).

  As shown in FIG. 3, the manufacturing method of the diaper of this embodiment can be manufactured similarly to the manufacturing method of the conventional so-called cross-flow type pants-type disposable diaper.

  The manufacturing method of the diaper of the present embodiment includes a step of forming a continuous body of the outer packaging material 11, a step of arranging the absorbent main body 12 in the continuous body of the outer packaging material 11, and a continuous body of the outer packaging material 11. Leg hole forming step for forming the leg hole 13, a continuum of the outer packaging material 11 and the folding process of the absorbent main body 12, and a diaper continuous body (pants type) in which the outer packaging material 11 and the absorbent main body 12 are folded in two. A step of forming the side seal portion 14 by heat-sealing the intermediate article continuous article 10 ′) 10 ′ with a predetermined interval in the length direction by the apparatus 1 (not shown in FIG. 3); 10 'is cut | disconnected by the side seal part 14 with a cutting | disconnection means (not shown), and the isolation | separation process of isolate | separating into each diaper 10 is comprised.

  In the step of forming the continuous body of the outer packaging material 11, the outer layer sheet 11 </ b> A included in the outer packaging material 11 and the inner layer sheet 11 </ b> B disposed on the skin side are joined to form a continuous body of the outer packaging material 11. In this embodiment, when these sheets are joined together, the waist elastic member 11C and the leg elastic member 11D are also supplied between these sheets and joined in an expanded state between them. Specifically, an adhesive for fixing the waist elastic member 11C and the leg elastic member 11D to a predetermined portion of one or both opposing surfaces of the two sheets before the sheets are overlapped. In a state where these elastic members are sandwiched in an expanded state, both belt-like sheets are narrowed with a nip roll.

  The outer layer sheet 11 </ b> A and the inner layer sheet 11 </ b> B are not joined to most of the abdomen, the back, and the crotch of the diaper 10. Specifically, the outer layer sheet 11A and the inner layer sheet 11B are joined to each other by a method such as heat sealing, high frequency sealing or ultrasonic sealing at both side edges of the stomach side and the back side of the diaper 10, and the waist At the peripheral edge of the opening and the peripheral edge of each of the pair of leg holes 13, they are joined to each other by an adhesive such as a hot-melt adhesive, and at the central part in the diaper width direction of each of the ventral side, the back side, and the crotch It is joined. And it is not joined in parts other than those.

  For the outer layer sheet 11A and the inner layer sheet 11B, materials conventionally used in this type of disposable diaper are used. As a material for the outer layer sheet and the inner layer sheet, a non-woven fabric, paper, a resin film, or a composite sheet obtained by combining these materials is used as a base sheet, and the base sheet is subjected to high stretching processing to form stretchability and a three-dimensional shape. And the like.

  The waist elastic member 11C is supplied to both side portions of the outer packaging material 11 so as to be positioned at the waist portion of the diaper, and is bonded and fixed with an adhesive. The leg elastic member 11D is supplied in accordance with the shape of the leg hole 13 and the crotch part to be formed later, and is joined and fixed with an adhesive. The leg elastic member 11D is introduced between the belt-like sheets while being swung by a known rocking guide (not shown) in a direction perpendicular to the flow direction of the outer layer sheet 11A and the inner layer sheet 11B. As the waist elastic member 11 </ b> C and the leg elastic member 11 </ b> D, ordinary members conventionally used for this type of article can be adopted. As the waist elastic member 11C and the leg elastic member 11D, elastic materials such as natural rubber, polyurethane-based resin, foamed urethane-based resin, and hot-melt elastic members are made into a thread (thread rubber) or a belt (flat rubber), respectively. Those formed in the above are preferably used.

  In the arrangement process of the absorbent main body 12, the absorbent main body 12 to which an adhesive such as a hot melt adhesive is applied in advance is rotated 90 degrees and intermittently supplied onto the continuous inner layer sheet 11 </ b> B of the outer packaging material 11. Fixed.

  The absorbent main body 12 has a substantially vertically long form having a liquid-permeable top sheet, a liquid-impermeable or water-repellent back sheet, and a liquid-retaining absorbent core interposed between the two sheets. is doing. For these topsheet, backsheet and absorbent core, those similar to those conventionally used for this type of article are employed. The absorbent core is preferably composed of a superabsorbent polymer particle and a fiber material and covered with tissue paper (not shown).

  In the leg hole forming step, the leg hole 13 is formed inside the annular portion of the leg elastic member 11D in the continuous body of the outer packaging material 11 on which the absorbent main body 12 is arranged. For the formation of the leg hole 13, a method similar to the method in the conventional method for manufacturing this type of article such as a rotary cutter or a laser cutter is employed. The leg holes can be formed before the absorbent main body 12 is arranged.

  In the folding step, after the both side edges of the continuous body of the outer packaging material 11 are folded in advance so as to be folded at both ends in the length direction of the waist elastic member 11C and the absorbent main body 12, the continuous body of the outer packaging material 11 and The absorbent main body 12 is folded in half.

  In the joining step, a diaper continuous body 10 ′ composed of a continuous body of the outer packaging material 11 folded together with the absorbent main body 12 is supplied between the rolls 2 and 3 of the apparatus 1. Then, heat sealing is performed, and the side seal portion 14 (see FIG. 4) having the pattern-shaped joining portions 140 corresponding to the pattern portions 20B and 30B is formed on the diaper continuous body 10 '. In this joining process, that is, heat seal processing, there is a region where the applied pressure and the joining strength (seal strength) are in a proportional relationship, and the seal strength increases as the pressure is increased. Usually, a constant pressure is always applied to the upper and lower rolls 2 and 3 during the heat sealing process, and therefore, a large pressure is applied to a portion where the contact area (seal area) between the pattern portions is small in the above-described region. This increases the seal strength. This is because when the applied pressure is constant and the area is small, the stress (force applied per unit area) increases. Therefore, since the pattern width WP of each pattern portion is provided to be narrow as described above, like the rolls 2 and 3, the area (line length) in which the pattern portions are in contact with each other is small (short), The seal strength is high at both ends of the pattern portion where the stress is high, the area (line length) in contact with the pattern portions is large (long), and the seal strength is low at the portion where the stress is low at the center. For this reason, the joining part 140 formed in the side seal part 14 of the diaper 10 to be obtained is provided with a joining strength lower in the center than both ends of the joining width W140. Therefore, the joined portion does not become too hard, and a decrease in the texture of the workpiece side seal portion 14 accompanying the joining can be suppressed.

  In the separation process, the continuous body 10 ′ is cut at a substantially central portion between the side seal portions 14 of the continuous body 10 ′ of the diaper formed in the joining process and separated into individual diapers 10. For the separation of the diaper 10, a technique similar to that in a method for manufacturing this type of article is conventionally employed.

As explained above, according to the manufacturing method of the diaper of the present embodiment, when the side seal portion 14 is formed on the diaper continuous body 10 ′ by heat sealing, the heat sealing is performed by the apparatus 1. When the pattern parts come into contact with each other through the diaper continuum 10 and are separated from each other, the impact received is reduced. Therefore, it is possible to suppress the damage to the surface of the side seal portion at the time of discharging is performed a heat sheet Lumpur diaper web 10 'in device 1. Moreover, the joining part 140 formed in the side seal part 14 of the diaper 10 obtained is provided with a joining strength lower in the center than both ends of the joining width W140. Therefore, the joined portion does not become too hard, and a decrease in the texture of the workpiece side seal portion 14 accompanying the joining can be suppressed.

  5 to 8 are plan views showing other embodiments of the processing portion of the processing roll in the apparatus of the present invention. In these drawings, portions common to the roll 2 of the apparatus 1 are denoted by the same reference numerals, and description thereof is omitted. Therefore, the description in the roll 2 of the above embodiment is appropriately applied to a portion that is not particularly described. Hereinafter, each characteristic part will be described. In addition, embodiment described below is applied also to the anvil part of an anvil roll.

  The roll processing portion 20 ′ of the embodiment shown in FIG. 5 is configured such that the discharge-side edge portion 201 </ b> B of the pattern portion 20 </ b> B is orthogonal to the flow direction of the workpiece. The occurrence of impact between the rolls during the heat sealing process is greater when the processed part and the anvil part are in contact with each other than when separated. For this reason, when the influence of the impact at the time of separation is within an allowable range, as in the present embodiment, only the supply-side edge portion 201B of the workpiece is directed inward from the both sides in the width direction of the roll, It can also be provided so that the pattern width in the circumferential direction of the pattern portion 20B is narrowed.

  The roll processing portion 20 ′ of the embodiment shown in FIG. 6 is provided such that a portion (constricted portion) where the pattern width in the circumferential direction of the pattern portion 20 B is the narrowest is unevenly distributed on one side of the pattern portion 20 B. In the present invention, it suffices if the pattern width in the circumferential direction of the pattern portion is narrowed from both sides in the width direction of the processing roll to the inside, and the pattern width is the narrowest as in this embodiment. This position is not limited to the central portion of the pattern portion in the roll width direction.

  The processing portion 20 ′ of the roll of the embodiment shown in FIG. 7 is provided so that the pattern portion 20 </ b> B is cut at the center in the width direction of the roll, that is, discontinuous. In the present invention, it suffices that the pattern width in the circumferential direction of the pattern portion is narrowed from both sides in the width direction of the processing roll to the inside, and the pattern portion is discontinuous as in the present embodiment. It may be. In the present embodiment, since the pattern portion is discontinuous, the obtained workpiece can be easily torn by inserting a finger from a portion that is not joined (in the present embodiment, the central portion). For example, in the case of a diaper as in the above embodiment, it is easy to tear a finger from the non-contact portion of the side seal portion, and it is easy to discard after use.

The processing part 20 ′ of the roll part of the embodiment shown in FIGS. 8 and 9 is obtained by changing the form of the bearer part 20A.
The processed portion 20 ′ shown in FIG. 8 is provided so that the bearer portion 20A does not protrude so as to follow the circumference of the roll. As for processing part 20 'shown in FIG. 9, the bearer part 20A is provided in the perimeter of the roll. In the present invention, from the both sides in the width direction of the processing roll toward the inside, the pattern portion in the circumferential direction of the pattern portion is provided to become narrower, the bearer portion before the workpiece contacts the processing portion 20B, Since it is only necessary to be in a position where the impact when the processing roll and the anvil roll come into contact with each other, the extent of the overhang along the circumference of the roll of the bearer portion 20A is the dimension in the width direction of the workpiece as in these embodiments. Or, it can be shortened or lengthened according to the generated impact force.

The present invention is not limited to the embodiment.
In the apparatus of the present invention, the processing part 20 of the roll 2 and the anvil part of the roll 3 have the same form as in the apparatus 1 of the embodiment, but they can be in different forms. For example, an anvil part can also be made into the flat form without a pattern.

  In addition to the stripe pattern as described above, the pattern form of the pattern portion is formed when individual patterns are gathered, such as a dot shape in which a plurality of protrusions having a predetermined cross-sectional shape such as a circle are formed. Any shape can be adopted as long as the outer shape of the pattern to be formed is such that the width of the outer shape in the circumferential direction of the pattern portion becomes narrower from both sides in the width direction of the processing roll toward the inside. .

  The heat sealing apparatus and the method for producing a sealed article of the present invention can be used in various industries depending on the workpiece. The present invention is particularly suitable for the production of pants-type absorbent articles such as pants-type disposable diapers, pants-type sanitary napkins, pants-type incontinence pads, etc., but does not have an absorbent main body or absorbent core. It is also suitable for manufacturing sanitary shorts and other pants-type wearing articles.

It is a perspective view of the important section showing typically one embodiment of the heat seal device of the present invention. It is a figure which shows the process part or anvil part of each roll in the embodiment, (a) is an enlarged plan view, (b) is AA arrow sectional drawing. It is a perspective view which shows typically the manufacturing process of the diaper which uses the heat seal apparatus of this invention. It is an enlarged plan view of one form of the side seal part in the disposable diaper formed with the heat seal device of the present invention. It is a top view which shows other embodiment of the process part of the process roll in the heat seal apparatus of this invention. It is a top view which shows other embodiment of the process part of the process roll in the heat seal apparatus of this invention. It is a top view which shows other embodiment of the process part of the process roll in the heat seal apparatus of this invention. It is a top view which shows other embodiment of the process part of the process roll in the heat seal apparatus of this invention. It is an expansion | deployment top view which shows other embodiment of the process part of the process roll in the heat seal apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat seal apparatus 2 Processing roll 20 Processing part 20A Bearer part 20B Pattern part 201B Supply side edge part 202B Discharge side edge part 3 Anvil roll 30 Anvil part 4 Slip prevention means 5, 6 Tension applying means 10 Pants type disposable diaper (pants type) Wearing items)
100 Workpiece

Claims (6)

A processing roll having a heat sealing processing portion on a peripheral surface portion, and an anvil roll having an anvil portion for receiving the processing portion, and when each of the rolls is rotating, the processing portion and the anvil portion A heat sealing device for performing heat sealing on a workpiece supplied in between,
The processed portion includes a bearer portion that is positioned on both sides in the width direction of the processing roll and does not have the heat seal pattern, and a pattern portion that is positioned between the bearer portions and has the heat seal pattern. And
The bearer part is provided in a flange-like form projecting toward the supply side and the discharge side of the workpiece so as to follow the circumference of the processing roll of the pattern part,
A heat seal in which at least a supply-side edge portion of the workpiece in the pattern portion is provided so that a pattern width in the circumferential direction of the pattern portion becomes narrower from both sides in the width direction of the processing roll toward the inside. apparatus.   When the pattern portion is viewed in plan, the processing portion has the supply-side edge portion of the workpiece and the discharge-side edge portion of the workpiece symmetrical with respect to the rotation axis of the processing roll. The heat sealing apparatus according to claim 1 provided.   The supply side edge part and discharge side edge part of the said workpiece in the said anvil part are provided in the same shape as the said supply side edge part and the said discharge side edge part in the said process part. Heat seal device. The heat seal device according to any one of claims 1 to 3, wherein, in a plan view of the processing portion, a boundary between the bearer portion and the pattern portion is chamfered in a curved shape. While rotating each said roll of the heat sealing apparatus as described in any one of Claims 1-4, a workpiece is supplied between the said process part and the said anvil part, A heat seal is carried out to this workpiece. The manufacturing method of the seal | sticker processed article which comprises the process to give. The method for manufacturing a sealed article according to claim 5 , wherein the workpiece is a continuous article of an underwear-type wearing article, and heat sealing is performed on a side seal portion of the wearing article by the heat sealing.

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