JP5913669B1 - Disposable wearing article, manufacturing apparatus and manufacturing method thereof - Google Patents

Abstract

An elastic member having a configuration capable of reducing the amount of applied adhesive (amount used) and suppressing the occurrence of defective products, and a disposable wearing article using the elastic member. Moreover, the manufacturing apparatus and manufacturing method for manufacturing such an elastic member easily and cheaply are provided. Regarding the waistline gather rubber 30, an adhesive is applied only to the stretched regions TA1 and TA2 and attached to the outer and inner backsheets 1 and 2, and the relaxed free region FA is the backsheet. 1 and 2 are not bonded. At the time of mounting, the gathers are formed substantially only by contraction in the tension regions TA1 and TA2 of the rubber 30. The relaxed and non-bonded free region FA is cut into two at an intermediate position. Each of the cut pieces 301 and 301 is integrally connected to the adjacent stretched and bonded tension regions TA1 and TA2. [Selection] Figure 1

Description

The present invention provides a disposable wearing article in which one or a plurality of elongated elastic bodies are arranged on one side of a flexible sheet or between a pair of flexible sheets, an apparatus for manufacturing the disposable wearing article , and about the production how. Specifically, for example disposable diapers, in a disposable wearing article such as a sanitary napkin (which are also articles for body fluid absorption), the onset Ming girth gather (i.e. folds formed in the waist portion, wrinkles or folds) It is suitably used for the forming site, and the present invention is suitable for producing such disposable wearing articles .

  For example, in a disposable diaper (regardless of a pants type or a tape type), an absorbent body containing superabsorbent polymer particles is covered with a plurality of sheets (each sheet is composed of a single layer or multiple layers). In general, a liquid-permeable top sheet (also referred to as a surface sheet or upper layer sheet) is provided on the body side of the absorbent body (which may itself be covered with a packaging sheet). On the opposite side, a liquid-impermeable back sheet (also referred to as a back sheet or an outer layer sheet) or the like is provided. In addition, elongated elastic bodies (for example, thread-like rubber) are arranged and fixed on the waist, leg, waistline, etc. of the backsheet, and these elastic bodies are waist gathered and leg gathered when they are elastically restored (that is, contracted). It is involved in the formation of waistline gathers, etc., and has the function of fitting a disposable diaper to the body when worn. The outer surface of the backsheet (that is, the surface opposite to the body) is located on the outermost surface of the disposable diaper, so marks (house mark, brand mark, logo mark, etc.), product data (name / specifications)・ Manufacturers / sellers, etc.) and explanation fields (usage, precautions, etc.) may be printed directly or a label may be attached.

  In such a disposable diaper, when the waistline gathers are formed on the entire waistline part (entire circumference) by contraction of the waistline elastic body, the wearability to the body (that is, the waistline) is improved. However, the contraction force (that is, the elastic restoring force) of the elastic body for the waistline also reaches the absorber and the display unit through the back sheet, and the absorbency is lowered by the deformation and movement of the absorber, or is visually recognized by the bending of the display unit. Sexuality may deteriorate.

  Therefore, in Patent Document 1, for example, an area where gathers are not formed by adhering the entire elastic body adjusted in tension to the stretched portion and the non-stretched portion (corresponding to the arrangement position of the absorber and the display unit) is attached to the back sheet. To prevent the absorption of the absorber and the visibility of the display unit from being lowered. However, in Patent Document 1, since the adhesive is applied to the back sheet side, it must be applied wider than the elastic body, and the amount of adhesive applied (that is, the amount used) tends to increase. In addition, since it is applied even to the non-stretched portion (corresponding to the back sheet) that is not involved in gather formation, the amount of adhesive applied increases more and more.

  On the other hand, in Patent Documents 2 and 3, for example, an adhesive is intermittently applied to the back sheet side, an elastic body that is stretched as a whole is bonded, and a non-bonded portion of the bonded elastic body is cut, thereby absorbing the absorbent body The amount of adhesive applied is reduced while ensuring the absorbability of the resin and the visibility of the display part. However, in Patent Documents 2 and 3, when a cutting error occurs in the non-bonded portion of the elastic body (for some reason during the manufacturing process), a waistline gather is formed around the entire backsheet due to the contraction (elastic return) of the elastic body. The disposable diaper will be treated as a defective product. In Patent Documents 2 and 3, the same applies even when an adhesive is intermittently applied to the elastic body.

Japanese Patent No. 2602408 Japanese Patent No. 2761166 Japanese Patent No. 4243008

An object of the present invention is to provide reducing the application amount of the adhesive (usage), a wearing article discarded have used that have a possible inhibition constituting the occurrence of defective products. Moreover, the other subject of this invention is providing the manufacturing apparatus and manufacturing method for manufacturing such a disposable wearing article easily and cheaply.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, the disposable wearing article of the present invention is:
(If the elastic member is a plurality of, for example, in parallel form) a pair of sheet between having one side or the flexibility of the single sheet having flexibility located, and the front body portion of the in stretched condition sheet and after One or a plurality of elongated elastic bodies that are stuck and fixed to each of the body parts, and when the elastic body is elastically restored (i.e., contracted), the sheet is gathered around the waistline (i.e., the collar formed on the waistline portion), Disposable wearing articles that form creases or creases),
It said elastic body includes a tensile region is stretched state a predetermined tension is applied, the relaxed state (i.e., substantially state of tension 0) is not granted tension and a free region that is, the front body portion and has in the longitudinal direction of a girth portion of the back body part corresponding to the waist circumference in a form that the latter is positioned between the former, only the tension zones of which stretched state paste in the an adhesive application region sheet a resulting state, the free area is a state divided into two split pieces at an intermediate position to a relaxed state and unbonded with respect to the seat, adjacent to the divided piece of each of the free areas The tension region in the stretched state and the bonded state is integrally connected;
The waistline gather is formed on the sheet only by elastic return of the elastic body based on a tension applied to each of the tension regions at both longitudinal ends of the waistline part .

In such disposable wearing articles , the adhesive is applied to the elastic body, not the sheet, and the adhesive is applied only to the stretched tension region and not to the relaxed free region. (Use amount) can be reduced. In addition, the free region of the elastic body is in a relaxed and non-adhesive state, and the free region is divided (specifically, cut or melt cut), so that the portion of the sheet corresponding to the free region is worn. Since the waistline gathers are not formed regardless of front and rear, the occurrence of defective products is suppressed and the yield of products is improved. Furthermore, even when a person whose waistline (abdominal circumference) is close to the upper limit within a size application range of a disposable diaper or the like , for example, the wearing feeling is improved without being tightened by the elastic body in the free region. On the other hand, even if a slight tension occurs (remains) in the free area during the manufacturing process due to manufacturing variations, the free area is divided and the tension is reduced to 0 before installation (ie during packaging, packing, display, etc.) by avoiding the waistline gather formation on a portion corresponding to the absorbent body and the display unit, it does not lower the visibility of the absorbent and the display section of the absorber. In more Fuen, in the production of disposable wearing article, it is possible more cheaply to provide a disposable wearing article by the dividing the free region step (and equipment) be simplified and be Turkey of the elastic body.

Note that “dividing the free region” means cutting or melting and cutting the free region of the elastic body by at least one of the pressurizing unit and the heating unit.

The above "disposable wearing articles" include articles for absorbing body fluids such as disposable diapers, sanitary napkins, etc., for human bodies for infants, the elderly, persons with physical disabilities, etc., and for pets for dogs, cats, etc. It doesn't matter .

  The “elongated elastic body” is a rubber or elastomer having a circular shape, an elliptical shape, a polygonal shape, or the like in cross section, and having a thread shape, a string shape, a belt shape, a net shape, or the like. As the “flexible sheet”, a nonwoven fabric mainly composed of elastomer fibers, a plastic sheet, or the like can be used, and each sheet is formed in a single layer or multiple layers. As the “adhesive”, either a hot melt system or a non-hot melt system can be used.

And in order to solve the above-mentioned subject, the manufacturing device of the disposable wearing article of the present invention,
One or more elongated elastic bodies are arranged on one side of a flexible single sheet or between a pair of flexible sheets (when there are a plurality of elastic bodies, for example, in parallel) and in an extended state When the elastic body is elastically restored (that is, contracted) by being attached and fixed to each of the front body part and the back body part of the sheet, the sheet is gathered at the waistline gathers (that is, formed on the waistline part) Or a crease) forming a disposable wearing article,
A tension adjusting unit for applying tension to the elastic body (in the case of a plurality of elastic bodies, individually or simultaneously (simultaneously)) and adjusting the tension;
An adhesive application unit for applying an adhesive to the elastic body whose tension has been adjusted (in the case of a plurality of elastic bodies, individually or simultaneously (simultaneously));
A merging and conveying unit for merging and conveying the sheet (in the case of a pair of sheets, individually or simultaneously (simultaneously)) with respect to the elastic body to which the tension is adjusted and the adhesive is applied;
A control unit for linking and controlling the operations of the tension adjusting unit, the adhesive application unit, and the merging and conveying unit;
The merging / conveying unit includes a pair of pressing rolls that sandwich and convey the sheet on which the elastic body is disposed, and the pressing rolls have convex portions that protrude radially outward from the outer peripheral surface,
The control unit is configured with respect to the elastic body.
The tension adjusting unit applies a predetermined tension to form a tensile region maintained in an extended state, and the adhesive application unit applies the adhesive to the tensile region, and further passes through the merging and conveying unit. A first control mode for bringing the stretched tension region into an adhesive state with the sheet;
Forming a free region that is in a relaxed state (ie, a state of substantially zero tension) without applying tension by the tension adjusting unit, and not applying the adhesive to the free region by the adhesive application unit, Furthermore, a second control mode in which the free region in the relaxed state is brought into a non-adhered state with the sheet by passing through the merging conveyance unit,
The waist region of the front body part and the back body part, respectively, in the longitudinal direction corresponding to the abdominal circumference, the free region is executed in a form located between the tension regions, respectively,
Then, the third control mode is executed by the convex portion to divide only the relaxed and non-bonded free region in the second control mode into two at an intermediate position with respect to the elastic body. And

Or in order to solve the above-mentioned subject, the manufacturing method of the disposable wearing article of the present invention,
One or more elongated elastic bodies are arranged on one side of a flexible single sheet or between a pair of flexible sheets (when there are a plurality of elastic bodies, for example, in parallel) and in an extended state When the elastic body is elastically restored (that is, contracted) by being attached and fixed to each of the front body part and the back body part of the sheet, the sheet is gathered at the waistline gathers (that is, formed on the waistline part) Or a crease) forming a disposable wearing article,
A tension adjusting unit for applying tension to the elastic body (in the case of a plurality of elastic bodies, individually or simultaneously (simultaneously)) and adjusting the tension;
An adhesive application unit for applying an adhesive to the elastic body whose tension has been adjusted (in the case of a plurality of elastic bodies, individually or simultaneously (simultaneously));
A merging and conveying unit for merging and conveying the sheet (in the case of a pair of sheets, individually or simultaneously (simultaneously)) with respect to the elastic body to which the tension is adjusted and the adhesive is applied;
A control unit for linking and controlling the operations of the tension adjusting unit, the adhesive application unit, and the merging and conveying unit;
The merging / conveying unit includes a pair of pressing rolls that sandwich and convey the sheet on which the elastic body is disposed, and the pressing rolls have convex portions that protrude radially outward from the outer peripheral surface,
The control unit is configured with respect to the elastic body.
The tension adjusting unit applies a predetermined tension to form a tensile region maintained in an extended state, and the adhesive application unit applies the adhesive to the tensile region, and further passes through the merging and conveying unit. A first step of bringing the tension region in the stretched state into an adhesive state with the sheet;
Forming a free region that is in a relaxed state (ie, a state of substantially zero tension) without applying tension by the tension adjusting unit, and not applying the adhesive to the free region by the adhesive application unit, Further, the second step of bringing the free region in the relaxed state into a non-adhered state by passing through the merging and conveying unit,
The waist region of the front body part and the back body part, respectively, in the longitudinal direction corresponding to the abdominal circumference, the free region is executed in a form located between the tension regions, respectively,
Then, the third step of dividing only the relaxed and non-bonded free region in the second step into two at an intermediate position is performed on the elastic body by the convex portion. .

According to such a manufacturing apparatus (or manufacturing method), the adhesive is applied to the elastic body, not the sheet, and the adhesive is applied only to the stretched tension region in the first control mode (or the first step). In addition, since it is not applied to the relaxed free region in the second control mode (or the second step), the application amount (use amount) of the adhesive can be reduced. In the second control mode (or the second step), the free region of the elastic body is in a relaxed and non-adhesive state, and the free region is divided in the third control mode (or the third step). Since the waistline gathers are not formed on the corresponding sheet portions before and after wearing, the occurrence of defective products is suppressed and the yield of products is improved. Furthermore, even when a person whose waistline (abdominal circumference) is close to the upper limit within a size application range of a disposable diaper or the like , for example, the wearing feeling is improved without being tightened by the elastic body in the free region. On the other hand, even if a slight tension is generated (remains) in the free area in the second control mode (second process) due to manufacturing variations, the free area is divided and mounted in the third control mode (third process). Absorbance of the absorbent body and visibility of the display section can be achieved by setting the tension to 0 (that is, during packaging, packing, display, etc.) and avoiding the gathering of the waist around the absorbent body and the display section. There is no reduction. Therefore, it is possible to produce more easily and inexpensively disposable wearing article by a third control mode to the (third step) be simplified to Turkey for dividing the free region of the elastic body.

A heating element is built in at least one of the pair of pressing rolls,
In the third control mode (or the third step), the control unit heats the elastic body with the heating element to assist the division of the free region.

  In this way, the free area division (cutting or melt cutting) of the elastic body can be easily executed by the combined use of pressing by the pressing roll (convex part thereof) and heating by the heating element. When only the elastic body fixed to the sheet is melt-cut, it is desirable to use a material having a melting point lower than that of the sheet for the elastic body. However, even when a material having a higher melting point than that of the sheet is used for the elastic body, it is possible to cut only the elastic body by applying a pressing force by the pressing roll (convex portion thereof). At that time, if the elastic body is heated with a heating element to a predetermined temperature below the melting point, the pressing force required for cutting can be reduced.

Expand explanatory diagram showing an example of a schematic structure of the diaper discarded it has engaged Ru use in the present invention. The AA cross-section enlarged explanatory view of FIG. BB cross-section expansion explanatory drawing of FIG. The perspective explanatory view showing an example of the diaper manufacturing device concerning the present invention. The flowchart showing the outline | summary of the manufacturing process of the diaper by the control part of FIG. Explanatory drawing which expands the principal part of FIG. 4 and shows as a manufacturing process of a diaper. Development diagram showing a reference example of a schematic structure of Operation s discarded diaper. A'-A 'cross-sectional enlarged explanatory drawing of FIG. B'-B 'cross-section enlarged explanatory drawing of FIG. Perspective view showing a reference example of diaper manufacturing apparatus. The flowchart showing the outline | summary of the manufacturing process of the diaper by the control part of FIG. Explanatory drawing which expands the principal part of FIG. 10 and shows as a manufacturing process of a diaper.

( Example)
Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. 1 to 3 show an example of a diaper discarded have engaged Ru use in the present invention. 1-3 disposable diaper 10 shown in (a disposable wearable article product) is an example of a so-called body fluid absorbent article, is called as "pant type disposable diaper." The absorbent body 5 located at substantially the center of the disposable diaper 10 is formed into various shapes such as a flat plate shape including superabsorbent polymer particles, and the periphery is covered with a plurality of sheets. For example, a top sheet 6 that is in direct contact with the skin is provided on the body side of the absorber 5 (ie, the body fluid absorption side), and the outer back sheet 1 (first sheet) is provided on the side opposite to the body (ie, the body fluid non-absorption side). ) And the inner back sheet 2 (second sheet), and the leakage preventing sheet 4 is also provided between the absorber 5 and the inner back sheet 2. Further, these sheets 1, 2, 4, 6 are made of a flexible nonwoven fabric, the top sheet 6 is liquid permeable, and the back sheets 1, 2 and the leakage preventing sheet 4 are liquid impermeable.

  Note that a plurality of display labels 11 (display portions) printed with logo marks, product names, etc. are provided on the outer surface of the outer back sheet 1 (that is, the surface opposite to the body) which is the outermost surface of the disposable diaper 10 (see FIG. Then, it is affixed to the front body part and the back body part in a total of two places). In addition, when the front body and the back body are overlapped to form the pants, openings are formed in the waist portion WS at the upper edge portion and the leg portions LG at the left and right edge portions, respectively.

  Between the outer back sheet 1 and the inner back sheet 2, a gather (a heel, a crease or a crease; not shown) is formed on these sheets 1 and 2, and the body fit function and fluid leakage when worn In order to enhance the prevention function, for example, thread-like or string-like elongated rubbers are arranged at a plurality of locations. In this embodiment, a plurality of waistline gather rubbers 30 corresponding to the waist circumference of the waistline part BD (in the figure, a total of two locations on the front and back bodies × 5 each), and a plurality corresponding to the openings of the waist part WS (in the figure, the front and back body parts). A total of two rubber gathers 31 for waist gathers and a plurality of leg gather rubbers 32 corresponding to the openings of the leg portions LG (two in a U-shape or V-shape in the figure) The sheets 1 and 2 are fixed to the opposing surfaces of the sheets 1 and 2, respectively.

  Among them, the waist gather rubber 31 and the leg gather rubber 32 are attached to the back sheets 1 and 2 over the entire length to form a gather in order to squeeze the opening and fit the body exactly. On the other hand, in the waistline gather rubber 30, in order to avoid a decrease in the absorbability of the absorbent body 5 and a deterioration in the visibility of the display label 11, the gathers are not formed in a portion overlapping these arrangement positions. As shown in FIG. 1, the leg gather rubber 32 overlaps the absorber 5 at the center crossing portion, but this portion tends to be stretched by being pulled in the opening direction of the leg portion LG when attached. The whole is attached to the back sheets 1 and 2. Accordingly, in the following description, only the waistline gather rubber 30 (elastic body) is targeted, and is also simply referred to as the rubber 30.

  As shown in FIG. 1 to FIG. 3, a total of ten (2 locations × 5) rubbers 30 are arranged in parallel and parallel between the outer backsheet 1 and the inner backsheet 2. Each rubber 30 is provided with a first tension region TA1 and a second tension region TA2 which are stretched by applying a certain tension, and are formed in a relaxed state (that is, substantially a tension is not imparted). A free area FA that is 0 state) is formed in the central portion. As described above, the free area FA of the rubber 30 overlaps with the arrangement position of the absorber 5 and the display label 11. Then, for example, a hot-melt adhesive AD is applied only to the stretched areas TA1 and TA2 and is attached to the outer and inner backsheets 1 and 2, and the relaxed free area FA is the backsheets 1 and 2. It is in a non-adhesive state. Therefore, at the time of mounting, the gathers are substantially formed only by elastic return (shrinkage) in the tension regions TA1 and TA2 of the rubber 30.

  Further, the relaxed and non-bonded free region FA is cut (divided) into two at an intermediate position. Each of the cut pieces 301 and 301 (divided pieces) is integrally connected to adjacent stretched and bonded tension regions TA1 and TA2. Since the free area FA is originally in a relaxed state, the cut pieces 301 and 301 obtained by cutting the free area FA are hardly contracted and the overlapping state with the display label 11 is maintained as it is. However, since the rubber 30 is on the back side (body side) of the outer back sheet 1, the visibility of the display label 11 is not hindered.

As described above, the adhesive AD is applied to the rubber 30 instead of the back sheets 1 and 2, and the adhesive AD is applied only to the stretched regions TA1 and TA2, and not to the relaxed free region FA. The application amount (use amount) of the adhesive AD can be reduced. Further, the free area FA of the rubber 30 is in a relaxed and non-adhered state, and since the gathering of the portions corresponding to the absorbent body 5 and the display label 11 is avoided by dividing the free area FA, the absorbability of the absorbent body 5 is reduced . Further, the visibility of the display label 11 is not deteriorated, the generation of defective products is suppressed, and the yield of products is improved. Incidentally, the cutting of the free area FA dwelt in one place (divided into two), since the portion of the backsheet 1 and 2 corresponding to the freely region FA gathers are not formed, the cutting step (and cutting equipment) Simple Can be configured. Furthermore, even when a person whose waistline (abdominal girth) is close to the upper limit within the size application range of the disposable diaper 10 is worn, the feeling of wearing is improved without being tightened by the rubber 30 in the free area FA.

Next, FIG. 4 shows an example of a diaper manufacturing apparatus according to the present invention. Diaper manufacturing apparatus 100 shown in FIG. 4 (production equipment disposable wearing article) includes a tensioner 110 for adjusting the tension applied to the rubber 30 (tension adjuster) for applying adhesive AD to the rubber 30 The operation of the application nozzle 120 (adhesive application unit), the merging and conveying unit 130 for merging and conveying the back sheets 1 and 2 to the rubber 30, and the operation of the tensioner 110, the application nozzle 120 and the merging and conveying unit 130 are linked. And a control unit 140 for performing control.

  The tensioner 110 applies tension to a plurality (ten in the figure) of the thread-like or string-like rubber 30 at the same time (simultaneously) and adjusts the tension. When individually adjusting the tension, a plurality of tensioners 110 may be provided. The application nozzle 120 sprays and applies the hot melt adhesive AD in a molten state simultaneously (simultaneously) to the plurality of rubbers 30 whose tensions are adjusted. When the tension is individually adjusted, the adhesive AD is individually applied from the plurality of application nozzles 120. In the case of a plate-like or belt-like rubber, a pair of application nozzles 120 can be provided for the front surface and the back surface.

  The merge conveyance unit 130 merges and conveys the back sheets 1 and 2 individually to the plurality of rubbers 30 whose tension is adjusted by the tensioner 110 and the adhesive AD is applied by the application nozzle 120. For this purpose, the merging / conveying unit 130 has a single first merging roll 131 (driven by the first motor 131M) that adheres and conveys the plurality of rubbers 30 and the outer back sheet 1, and the downstream side in the conveying direction. It has a pair of 2nd confluence | merging rolls 132 (driven by the 2nd motor 132M) which are arrange | positioned and stick the inner back sheet 2 to the rubber | gum 30, and convey it from the opposite side to the outer back sheet | seat 1. FIG.

  Further, on the downstream side of the second merging roll 132 in the conveying direction, the merging / conveying unit 130 sandwiches the back sheets 1 and 2 bonded to the rubber 30 and rotates and conveys the pair of pressing rolls 133 (with the third motor 133M). Driven). One of the pressing rolls 133 (small-diameter roll arranged in the upper part in the drawing) is formed with a convex part 133a that protrudes radially outward from the outer peripheral surface. The convex part 133a is formed at one place in the circumferential direction along the axial direction, and exerts a pressing force on the rubber 30 with the outer peripheral surface of the other pressing roll 133 (cylindrical large-diameter roll) to be in a relaxed state and a non-adhered state The free area FA is cut (divided) into two at an intermediate position.

  Each of the pair of pressing rolls 133 includes a heater 133b (a heating element). The heater 133b has a function of assisting the cutting of the free area FA by heating the rubber 30 (through the back sheets 1 and 2).

  The control unit 140 mainly includes a CPU 141 that is an arithmetic device, a ROM 142 that is a read-only storage device, a RAM 143 that is a readable / writable main storage device that is used as a work area, and an input / output interface (I / F) 144. It is configured. Via the input / output interface 144, the control unit 140, the drive unit (not shown) of the tensioner 110, the drive unit (not shown) of the application nozzle 120, the first motor 131M of the first merging roll 131, and the second merging roll Signals are input / output between the second motor 132M of 132, the third motor 133M of the pressing roll 133, the heater 133b, and the like.

  Next, referring to the flowchart of FIG. 5 and with reference to FIGS. 4 and 6, in the diaper manufacturing process in the diaper manufacturing apparatus 100, after the rubber 30 is bonded to the back sheets 1 and 2, only the rubber 30 is free region FA. Each process in the case of cutting by will be described. 4 and 6, the back sheets 1 and 2 and the rubber 30 are conveyed one after another in a state in which the sections corresponding to the plurality of disposable diapers 10 are continuous. Then, different processes are executed in the form of simultaneous progress. Here, focusing on a specific section, a manufacturing process that sequentially proceeds while the section moves will be described along a time series of control operations based on a control signal from the control unit 140 (CPU 141).

<Preparation process>
In S1, the first merging roll 131 (first motor 131M), the second merging roll 132 (second motor 132M), and the pressing roll 133 (third motor 133M) are driven, and the rubber 30 and the outer back sheet are driven by these operations. 1. Supply of the inner backsheet 2 is started.

<First step (first time)>
In S2, the tensioner 110 is actuated to form a first tension region TA1 in which a predetermined tension is applied to the rubber 30 and maintained in an expanded state. Subsequently, the adhesive nozzle AD is applied to the first tension area TA1 by the operation of the application nozzle 120 in S3, and the operation of the application nozzle 120 is stopped together with the end of the first tension area TA1 in S4. In S5, the first tension region TA1 is fixed to the outer back sheet 1 in an adhesive state by passing through the first joining roll 131 in an extended state.

<Second step>
In S6, the operation of the tensioner 110 is stopped, and a free region FA that is in a relaxed state with substantially zero tension is formed. At this time, since the operation of the application nozzle 120 is stopped (S4), the adhesive AD is not applied to the free area FA. In S <b> 7, the free area FA passes through the first joining roll 131 in a relaxed state, and is brought into a non-bonded state with the outer back sheet 1.

<First step (second time)>
In S8, the tensioner 110 is actuated to form a second tension region TA2 in which a predetermined tension is applied to the rubber 30 and the stretched state is maintained. Subsequently, the adhesive nozzle AD is applied to the second tension area TA2 by the operation of the application nozzle 120 in S9, and the operation of the application nozzle 120 is stopped together with the end of the second tension area TA2 in S10. In S11, the second tension region TA2 is fixed to the outer back sheet 1 in an adhesive state by passing through the first joining roll 131 in an extended state.

  Accordingly, the rubber 30 is configured such that the free area FA is positioned between the first and second tension areas TA1 and TA2 in the longitudinal direction of the continuous backsheets 1 and 2, that is, in the conveying direction (left and right when viewed with a diaper). To be fixed to the outer backsheet 1 (see FIG. 6). In addition, when the 2nd tension | tensile_strength area | region TA2 of a preceding diaper and the 1st tension | tensile_strength area | region TA1 of a succeeding diaper are continuing, the operation | movement of the application nozzle 120 does not need to be stopped in S10. In such a case, S8 → S9 → S11 in the preceding first step (second time) → S4 → S5 in the following first step (first time) is performed continuously, and coating is performed up to the subsequent S4. The nozzle 120 can also be operated continuously.

<Coating process>
In S <b> 12, the rubber 30 and the outer back sheet 1 and the inner back sheet 2 merge and pass through the second merge roll 132. As a result, the inner back sheet 2 is bonded and fixed to the first and second tension areas TA1, TA2 of the rubber 30 from the opposite side of the outer back sheet 1, and is brought into a non-bonded state in the free area FA (see FIG. 6). ).

<Third step>
While operating the heater 133b of the pressing roll 133 in S13, only the free area FA of the rubber 30 is cut into two at the intermediate position by the convex portion 133a (see FIG. 6).

<Finish process>
The outline of the subsequent diaper manufacturing process PS is as follows. The leakage prevention sheet 4, the absorber 5, and the top sheet 6 are sequentially placed and fixed on the inner back sheet 2 (see FIG. 3). A disposable diaper 10 is manufactured by cutting such a laminated sheet at a first cutting line CL1 serving as a diaper boundary and a second cutting line CL2 for forming an opening of the leg portion LG, and is folded in half. When the right and left edge portions of the part BD are joined, the pants type is completed (see FIG. 6).

By passing through each process described above, the disposable diaper 10 shown in FIGS. 1-3 can be manufactured. By such a manufacturing method, the adhesive AD is applied to the rubber 30 instead of the back sheets 1 and 2, and the adhesive AD is applied only to the stretched regions TA1 and TA2 in the first step, and in the second step. Since it is not applied to the relaxed free area FA, the application amount (use amount) of the adhesive AD can be reduced. Further, in the second step, the free area FA of the rubber 30 is in a relaxed and non-adhered state, and in the third step, the formation of gathers in the portions corresponding to the absorber 5 and the display label 11 is avoided by dividing the free area FA. Therefore, the absorptivity of the absorber 5 and the visibility of the display label 11 are not lowered, the occurrence of defective products is suppressed, and the yield of products is improved. In the cutting of the free area FA third step requires only one place (divided into two), do not gather is formed in the portion of the backsheet 1 and 2 corresponding to the freely region FA, not a defective .

( Reference example )
7 to 9 showing a reference example of diapers discarded have used. In the disposable diaper 10 shown in FIGS. 7 to 9, the free area FA of the rubber 30 is left without being cut. Accordingly, the free area FA includes the first and second tension areas TA1 and TA2 located on both sides (they are in the stretched state and in the bonded state with the backsheets 1 and 2), the relaxed state and the backsheets 1 and 2 It is connected in a non-adhesive state.

  Further, in the merging and conveying unit 130 of the diaper manufacturing apparatus 100 shown in FIG. 10, a pressing roll (corresponding to the reference numeral 133 in FIG. 4) is omitted, and in the flowchart shown in FIG. 11 and the process explanatory diagram shown in FIG. 5 (corresponding to S13 of 5) is omitted.

  Thus, by omitting the cutting device and the cutting step, the manufacturing cost can be further reduced, and the disposable diaper 10 can be manufactured at a lower cost.

In the above embodiments, the diaper discarded have used has been described only apparatus and a method for manufacturing the disposable diaper, the present invention in a disposable wearing article other than disposable diapers (article for body fluid absorption) can be carried out.

In the reference examples (FIGS. 7 to 12), parts having the same functions as those in the examples ( FIGS. 1 to 6) are denoted by the same reference numerals, and detailed description thereof is omitted.

1 Outer back sheet (first sheet)
11 Display label (display part)
2 Inside back sheet (second sheet)
30 Gum rubber (elastic body)
TA1 First tension area TA2 Second tension area FA Free area 301 Cut piece (split piece)
10 disposable diapers (disposable wearable product)
100 diaper manufacturing equipment (production equipment of the disposable wearing article)
110 Tensioner (Tension adjustment part)
120 Application nozzle (adhesive application part)
130 Joining and Conveying Unit 131 First Joining Roll 132 Second Joining Roll 133 Pressing Roll 133a Protruding Part 133b Heater (Heating Element)
140 Controller AD Adhesive

Claims (5)

Positioned between the pair of sheets with one side or the flexibility of the single sheet having flexibility, and a paste fixed state to each of the front body part and back body portions of the sheet in a stretched state, 1 Or a disposable wearing article comprising a plurality of elongated elastic bodies , wherein the sheet forms a girth gather when the elastic bodies return elastically,
Said elastic body includes a tensile region is stretched state a predetermined tension is applied, a free area is relaxed state without tension is applied, the front a waist portion of the body portion and the back body part to the waist circumference has the corresponding longitudinal in a form that the latter is positioned between the former, and which from a state in which only the tension zones in the stretched state is attached to the an adhesive application region sheets, the free area is the The tension region in the stretched and bonded state, which is in a relaxed and non-adhered state with respect to the sheet, and is divided into two divided pieces at an intermediate position, and each divided piece of the free region and adjacent thereto It is integrally connected and,
The waistline gather is formed on the sheet only by elastic return of the elastic body based on the tension applied to each of the tension regions at both ends in the longitudinal direction of the waistline part . One or a plurality of elongated elastic bodies are arranged on one side of a flexible single sheet or between a pair of flexible sheets, and in the stretched state on each of the front body part and the back body part of the sheet By sticking and fixing, when the elastic body is elastically restored, the sheet is a disposable wearing article manufacturing apparatus that forms a waistline gather,
A tension adjusting unit for applying tension to the elastic body and adjusting the tension;
An adhesive application portion for applying an adhesive to the elastic body whose tension is adjusted;
A merging and conveying unit for merging and conveying the sheet with respect to the elastic body, the tension of which is adjusted and the adhesive is applied;
A control unit for linking and controlling the operations of the tension adjusting unit, the adhesive application unit, and the merging and conveying unit;
The merging / conveying unit includes a pair of pressing rolls that sandwich and convey the sheet on which the elastic body is disposed, and the pressing rolls have convex portions that protrude radially outward from the outer peripheral surface,
The control unit is configured with respect to the elastic body.
The tension adjusting unit applies a predetermined tension to form a tensile region maintained in an extended state, and the adhesive application unit applies the adhesive to the tensile region, and further passes through the merging and conveying unit. A first control mode for bringing the stretched tension region into an adhesive state with the sheet;
A free region that is in a relaxed state without applying tension by the tension adjusting unit is formed, and the adhesive is not applied to the free region by the adhesive application unit, and is further in a relaxed state by passing through the confluence conveying unit. A second control mode in which the free area of the non-adhered state with the sheet,
The waist region of the front body part and the back body part, respectively, in the longitudinal direction corresponding to the abdominal circumference, the free region is executed in a form located between the tension regions, respectively,
Then, the third control mode is executed by the convex portion to divide only the relaxed and non-bonded free region in the second control mode into two at an intermediate position with respect to the elastic body. An apparatus for manufacturing disposable wearing articles. A heating element is incorporated in at least one of the pair of pressing rolls,
The said control part WHEREIN: The said control part is a manufacturing apparatus of the disposable wearing article of Claim 2 which heats the said elastic body with the said heat generating body, and assists the division | segmentation of the said free area | region. One or a plurality of elongated elastic bodies are arranged on one side of a flexible single sheet or between a pair of flexible sheets, and in the stretched state on each of the front body part and the back body part of the sheet A method of manufacturing a disposable wearing article in which the sheet forms a waistline gather when the elastic body is elastically restored by being affixed,
A tension adjusting unit for applying tension to the elastic body and adjusting the tension;
An adhesive application portion for applying an adhesive to the elastic body whose tension is adjusted;
A merging and conveying unit for merging and conveying the sheet with respect to the elastic body, the tension of which is adjusted and the adhesive is applied;
A control unit for linking and controlling the operations of the tension adjusting unit, the adhesive application unit, and the merging and conveying unit;
The merging / conveying unit includes a pair of pressing rolls that sandwich and convey the sheet on which the elastic body is disposed, and the pressing rolls have convex portions that protrude radially outward from the outer peripheral surface,
The control unit is configured with respect to the elastic body.
The tension adjusting unit applies a predetermined tension to form a tensile region maintained in an extended state, and the adhesive application unit applies the adhesive to the tensile region, and further passes through the merging and conveying unit. A first step of bringing the tension region in the stretched state into an adhesive state with the sheet;
A free region that is in a relaxed state without applying tension by the tension adjusting unit is formed, and the adhesive is not applied to the free region by the adhesive application unit, and is further in a relaxed state by passing through the confluence conveying unit. A second step of making the free region of the non-adhered state with the sheet,
The waist region of the front body part and the back body part, respectively, in the longitudinal direction corresponding to the abdominal circumference, the free region is executed in a form located between the tension regions, respectively,
Then, the third step of dividing only the relaxed and non-bonded free region in the second step into two at an intermediate position is performed on the elastic body by the convex portion. A method for producing disposable wearing articles. A heating element is incorporated in at least one of the pair of pressing rolls,
The said control part is a manufacturing method of the disposable wearing article of Claim 4 which heats the said elastic body with the said heat generating body and assists the division | segmentation of the said free area | region in said 3rd process.

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