JP2012000384A - Method for manufacturing laminated sheet of absorptive article, laminated sheet of absorptive article and absorptive articles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a laminated sheet of an absorptive article, which can simply manufacture a laminated sheet of an absorptive article having soft feeling.SOLUTION: The method for manufacturing a laminated sheet of an absorptive article includes a following process: in a state where a first long sheet 11 composed of a nonwoven fabric and a second long sheet 12 composed of a liquid impermeable material are laminated, the first long sheet 11 and the second long sheet 12 are bonded intermittently in the lengthwise direction of each the first long sheet 11 and the second long sheet 12, in order to obtain a laminated sheet 13 laminated with the first long sheet 11 and the second long sheet 12. The first long sheet 11 and the second long sheet 12 are delivered with different amounts in a lengthwise direction of the sheet. Also, in a state that at least the second long sheet 12 is more stretched than the first long sheet 11 in the lengthwise direction of the sheet, the first long sheet 11 and the stretched second long sheet 12a are bonded intermittently to obtain the laminated sheet 13.

Description

  The present invention relates to a method for producing a laminated sheet for absorbent articles, a laminated sheet for absorbent articles, and an absorbent article. More specifically, an absorbent article laminate sheet capable of easily producing a laminate sheet for absorbent articles that has a soft texture and can be suitably used as a sheet disposed outside the absorbent article. The present invention relates to a manufacturing method, a laminated sheet for absorbent articles having a soft texture, and an absorbent article.

  Conventionally, absorbent articles absorb disposable diapers that absorb excreted fluid such as urine (for example, tape-type disposable diapers, pants-type disposable diapers, urine pads, etc.), sanitary napkins that absorb menstrual blood, and vaginal discharge. It is used as a sheet of cage. As these absorbent articles, an absorbent body, a top sheet that is arranged to cover the surface of the absorbent body, at least partially made of a liquid-permeable material, and a back surface of the absorbent body are arranged. And a back sheet made of a liquid-impermeable material.

  According to such an absorbent article, the excrement of the wearer passes through the liquid-permeable portion of the top sheet and is absorbed by the absorbent body, and by the back sheet made of a liquid-impermeable material. Leakage to the outside is prevented and the excrement is retained.

  As a conventional disposable diaper, for example, a cover sheet made of a nonwoven fabric or the like is further arranged on the outer side (back side) of the back sheet, and an outer portion of the diaper, that is, an outer side surface of the diaper is formed. Such a cover sheet or the like is desired to have a soft texture.

  Usually, such a cover sheet is bonded to the entire back surface of the back sheet by a hot melt adhesive or the like. Further, when a laminated sheet is manufactured by joining two sheets, for example, as a joining method in the case where at least one sheet is a nonwoven fabric made of a thermoplastic resin, the temperature is below the softening point of the thermoplastic resin. And the method of performing intermittently under the linear pressure of 24.5 kN / cm or more is proposed (for example, refer patent document 1).

Japanese Patent No. 37588839

  However, in the sheet joining method described in Patent Document 1, it is possible to join the two joined sheets without damaging the original texture of the sheet and with high joining strength. It is impossible to make one of the two sheets (ie, laminated sheets) joined to have a texture that is even richer than the texture that the sheet originally has. That is, in an absorbent article such as a disposable diaper, it is desired that the sheet disposed on the outside of the absorbent article has a softer texture. In the sheet joining method described in Patent Document 1, There is a problem that it cannot be said that such a request is met.

  The present invention has been made in view of such problems of the prior art, has a soft texture, and can be suitably used as a sheet disposed outside the absorbent article. A method for producing a laminated sheet for absorbent articles capable of easily producing a laminated sheet, a laminated sheet for absorbent articles obtained by such a production method, and such a laminated sheet for absorbent articles were used. An absorbent article is provided.

  As a result of intensive studies to solve the above-mentioned problems, the present inventor laminated two sheets made of a specific material and intermittently joined these sheets in the longitudinal direction of the sheet to obtain a laminated sheet. In the process, it has been found that a laminated sheet having an extremely soft texture can be easily obtained by intermittently joining one sheet with the other sheet in a state of being stretched in the longitudinal direction as compared with the other sheet. The present invention has been completed. According to this invention, the manufacturing method of the laminated sheet for absorbent articles shown below, the laminated sheet for absorbent articles, and an absorbent article are provided.

[1] In the state where the first long sheet made of nonwoven fabric and the second long sheet made of a liquid-impermeable material are laminated, the first long sheet and the second long sheet are each sheet. A step of obtaining a laminated sheet in which the first long sheet and the second long sheet are laminated, the first long sheet and the second long sheet. In the longitudinal direction of the sheet, and the first long sheet is stretched in the longitudinal direction of the second long sheet rather than the first long sheet. The manufacturing method of the laminated sheet for absorbent articles which joins a length sheet and the said 2nd elongate sheet intermittently.

[2] When the second long sheet is stretched to a length of 103 to 125% when the length in the non-stretched state is 100%, intermittently with the first long sheet. The manufacturing method of the laminated sheet for absorbent articles as described in [1] above.

[3] In the above [1] or [2], when the feeding amount of the second long sheet in the non-stretched state is 100%, the feeding amount of the first long sheet is 103 to 120%. The manufacturing method of the laminated sheet for absorbent articles of description.

[4] The method according to any one of [1] to [3], wherein an interval between joint portions in the longitudinal direction of the first long sheet and the second long sheet is 5 to 15 mm. A method for producing a laminated sheet for absorbent articles.

[5] The first long sheet and the second long sheet are joined intermittently in the longitudinal direction of the sheet and also in a direction perpendicular to the longitudinal direction of the sheet. ] The manufacturing method of the laminated sheet for absorbent articles in any one of [4].

[6] In the above [5], the length of the joining portion intermittently joined in the direction orthogonal to the longitudinal direction of the sheet is larger than the length of the joining portion intermittently joined in the longitudinal direction of the sheet. The manufacturing method of the laminated sheet for absorbent articles of description.

[7] The adhesion between the first long sheet and the second long sheet is at least selected from the group consisting of heat embossing, ultrasonic fusion, adhesion with a hot melt adhesive, and adhesion with a thermoplastic resin. The method for producing a laminated sheet for absorbent articles according to any one of [1] to [6], which is performed by a kind of method.

[8] The adhesion between the first long sheet and the second long sheet is hot embossing, and the uneven pattern by the heat embossing is formed on the surface side on which the first long sheet is arranged. 7] The manufacturing method of the laminated sheet for absorbent articles as described in 7].

[9] A first sheet made of a nonwoven fabric and a second sheet made of a liquid-impermeable material are laminated, and the first sheet and the second sheet are intermittently joined in at least one direction. The length of the first sheet existing between the joined parts is the non-stretched length of the second sheet existing between the joined parts. A laminated sheet for absorbent articles which is longer than the length in a non-stretched state and has a slack portion where the surface side of the first sheet is raised intermittently between the joint portions.

[10] An absorber, at least a part of which is made of a liquid-permeable material, a top sheet arranged so as to cover the surface of the absorber, and a liquid-impermeable material, which covers the back surface of the absorber An absorbent article using the laminated sheet for absorbent articles according to [9] as at least a part of the backsheet.

  The manufacturing method of the laminated sheet for absorbent articles of the present invention is to send out the first long sheet and the second long sheet in the longitudinal direction of the sheet, and to make the second long sheet more than the first long sheet. The laminated sheet is obtained by intermittently joining the first long sheet and the second long sheet with the second long sheet stretched in the longitudinal direction, and has a soft texture. And the laminated sheet for absorbent articles which can be used suitably as a sheet | seat arrange | positioned on the outer side of an absorbent article can be manufactured simply. In other words, the laminated sheet for absorbent articles obtained by the method for producing a laminated sheet for absorbent articles of the present invention (hereinafter also simply referred to as “laminated sheet”) is a stretched second long sheet that is not stretched. By contracting into a state, the first long sheet has slack (bumps) between the intermittent joining portions, and the surface side of the first long sheet has a slack section that rises intermittently. Become. Thereby, the lamination sheet manufactured by the manufacturing method of the lamination sheet for absorbent articles of this invention has a very soft texture by the said slack part.

  In addition, as described above, the laminated sheet for absorbent articles according to the present invention has a slack portion in which the surface side of the first sheet is raised intermittently due to the contraction of the second sheet that has been stretched in the manufacturing stage. An extremely soft texture is realized on the surface of the first sheet of the laminated sheet. Moreover, the absorbent article of the present invention is one in which the laminated sheet for absorbent articles is used as a back sheet, and has a soft texture.

It is explanatory drawing which shows typically one Embodiment of the manufacturing method of the laminated sheet for absorbent articles of this invention. It is a perspective view which expands and shows typically the method of laminating | stacking two sheets in one Embodiment of the manufacturing method of the laminated sheet for absorbent articles of this invention. It is sectional drawing which shows typically the cross section parallel to the longitudinal direction of the laminated sheet for absorbent articles obtained by the manufacturing method of the laminated sheet for absorbent articles of this invention, and shows the state which the 2nd elongate sheet extended | stretched. It is sectional drawing which shows typically the cross section parallel to the longitudinal direction of the laminated sheet for absorbent articles obtained by the manufacturing method of the laminated sheet for absorbent articles of this invention, and the 2nd elongate sheet contracted to the non-expanded state. Indicates the state. It is a perspective view showing typically one embodiment of a lamination sheet for an absorptive article of the present invention. It is a perspective view which shows typically other embodiment of the laminated sheet for absorbent articles of this invention. It is a partially notched top view which shows typically the state which looked at one Embodiment of the disposable diaper as an absorbent article of this invention from the top sheet side. It is a top view showing typically the state where one embodiment of the disposable diaper as an absorptive article of the present invention was seen from the back sheet side.

  Hereinafter, although the form for implementing this invention is demonstrated, this invention is not limited to the following embodiment. That is, it is understood that modifications and improvements as appropriate to the following embodiments are also within the scope of the present invention based on ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. Should be.

[1] Method for producing laminated sheet for absorbent article:
One embodiment of the method for producing a laminated sheet for absorbent articles according to the present invention includes a first long sheet 11 made of a nonwoven fabric and a second long sheet 12 made of a liquid-impermeable material, as shown in FIG. The first long sheet 11 and the second long sheet 12 are joined intermittently in the longitudinal direction X of the sheets 11 and 12 in a state where the first and second long sheets 11 and 12 are laminated. It is a manufacturing method of a laminated sheet for absorbent articles, which includes a step of obtaining a laminated sheet 13 laminated with a sheet 12.

  Here, FIG. 1 is explanatory drawing which shows typically one Embodiment of the manufacturing method of the laminated sheet for absorbent articles of this invention, FIG. 2 is the manufacturing method of the laminated sheet for absorbent articles of this invention. It is a perspective view which expands and schematically shows the method of laminating two sheets in one embodiment. Reference numeral “21” indicates a joint portion that intermittently joins the first long sheet 11 and the second long sheet 12. The longitudinal direction of each sheet 11, 12 is indicated by “X”, and the direction orthogonal to the longitudinal direction X of each sheet 11, 12 is indicated by “Y” (shown in FIG. 2).

  In the method for producing a laminated sheet for absorbent articles according to the present invention, in the step of obtaining the laminated sheet 13 described above, the first long sheet 11 and the second long sheet 12 are respectively sent in the longitudinal direction X of the sheet, and In the state (second long sheet 12a) in which the second long sheet 12 is elastically stretched in the longitudinal direction X of the second long sheet as compared with the first long sheet 11, the first long sheet 11 and the second long sheet 12a are joined intermittently.

  Thus, the 1st elongate sheet | seat and the 2nd elongate sheet | seat are joined intermittently, and it has a soft texture and can be used suitably as a sheet | seat arrange | positioned on the outer side of an absorbent article. A laminated sheet for articles can be easily produced. Furthermore, as shown in FIG. 3, the laminated sheet for absorbent articles (hereinafter also simply referred to as “laminated sheet”) obtained by the method for producing a laminated sheet for absorbent articles of the present invention is in an elastically stretched state. When the second long sheet 12a is contracted to the non-expanded state, as shown in FIG. 4, the first long sheet 11b is loosened (bumped) between the intermittent joining portions 21. The surface side of the first long sheet 11b has a slack portion 14 that rises intermittently. Thereby, the laminated sheet manufactured by the method for producing the laminated sheet for absorbent articles of the present invention (that is, the second elongated sheet 12b in a state where the stretched second elongated sheet 12a is contracted) and the second sheet The laminated sheet 13b) constituted by the first long sheet 11b having the slack portion 14 due to the contraction of the long sheet 12b has a very soft texture due to the slack portion 14.

  In particular, in the method for producing a laminated sheet for absorbent articles according to the present invention, a sheet (that is, the second long sheet) other than the sheet (that is, the first long sheet) on which the slack portion 14 is formed is moved in the longitudinal direction. By intermittently joining in an elastically stretched state, the slack portion 14 can be formed with respect to the first long sheet by contraction of the second long sheet, which is extremely simple and soft. The laminated sheet 13b for absorbent articles having a good texture can be produced.

  Here, FIG. 3 is a cross-sectional view schematically showing a cross section parallel to the longitudinal direction of the laminated sheet for absorbent articles obtained by the method for producing a laminated sheet for absorbent articles of the present invention, and the second sheet is elastic. Shows a state of being stretched. FIG. 4 is a cross-sectional view schematically showing a cross section parallel to the longitudinal direction of the laminated sheet for absorbent articles obtained by the method for producing a laminated sheet for absorbent articles of the present invention, in which the second sheet is not stretched. The state contracted to the state is shown.

  In addition, the method for producing the laminated sheet for absorbent articles of the present invention includes, for example, as shown in FIGS. 1 and 2, a first supply roll 23 for supplying a first long sheet 11 made of a nonwoven fabric, A second supply roll 27 for supplying the second long sheet 12 made of a permeable material, and a pair of joining rolls 29 (upper rolls) for intermittently joining the first long sheet 11 and the second long sheet 12. 29a and the lower roll 29b) and the long laminated sheet 13 intermittently joined to each other are cut at predetermined intervals in the longitudinal direction to obtain a laminated sheet 13c for absorbent articles having a desired length. And a transport conveyor 35 that transports the absorbent article laminated sheet 13c, and the absorbent article laminated sheet manufacturing apparatus (hereinafter, also simply referred to as “laminated sheet manufacturing apparatus”) 100.

  In addition, the 1st elongate sheet | seat which consists of nonwoven fabrics can be used for the sheet | seat which comprises the outer side of an absorbent article, for example, a cover sheet etc., for example. On the other hand, the second long sheet made of a liquid-impermeable material is a sheet that prevents liquid such as excrement from leaking outside the absorbent article, for example, when the absorbent article is a disposable diaper. Can be used for a back sheet made of a liquid-impermeable material. That is, the laminated sheet obtained by the method for producing a laminated sheet for absorbent articles of the present invention is used as a composite sheet (composite cover sheet or composite back sheet) in which the cover sheet of the absorbent article is integrated with the back sheet. be able to. In addition, the 2nd elongate sheet | seat consisting of a liquid-impermeable material needs to be elastically expand-contract.

  A cover sheet means the exterior material which comprises the outer side of a disposable diaper etc., for example. There is no restriction | limiting in particular also about the kind of nonwoven fabric, The conventionally well-known nonwoven fabric manufactured by various manufacturing methods, such as air through (card hot air), card | curd embossing, and a spun bond, can be used suitably.

  Moreover, a back sheet means the sheet | seat arrange | positioned so that the back surface (surface located in the side far from a wearer's skin at the time of mounting | wearing) of the absorber used for an absorbent article may be coat | covered. This back sheet is made of a liquid-impermeable material because it is necessary to prevent the wearer's urine from leaking outside. As a sheet | seat (2nd elongate sheet | seat) which consists of a liquid-impermeable material, the sheet | seat (film) etc. which consist of resin, such as polyethylene, can be mentioned, for example, Among these, it is preferable to use a microporous polyethylene film. This microporous polyethylene film has a large number of fine pores of 0.1 to several μm, and is liquid-impermeable but has moisture permeability, so it is possible to prevent stuffiness inside the absorbent article. There is an advantage.

  The thickness of the first long sheet and the thickness of the second long sheet are not particularly limited, and are appropriately determined according to the purpose of use of the obtained laminated sheet, for example, the type of absorbent article to be used. be able to.

  Although the laminated sheet for absorbent articles of the present invention can be produced using the laminated sheet producing apparatus 100 for absorbent articles configured as shown in FIG. 1, the laminated sheet production for absorbent articles shown in FIG. The first long sheet 11 and the second long sheet 12 are fed out in the longitudinal direction of the sheet, and at least the second long sheet 12 is sent to the first long sheet 11 without being limited to the apparatus 100. Rather, it is sufficient that the first long sheet 11 and the second long sheet 12 can be joined intermittently in a state where the first long sheet 11 is stretched in the longitudinal direction X of the sheet. For example, in FIG. 1, although the example in the case of joining the 1st elongate sheet 11 and the 2nd elongate sheet 12 intermittently with a pair of joining roll 29 is shown, about a joining method, it is the above-mentioned. The method using the bonding roll 29 is not limited. For joining the first long sheet and the second long sheet, for example, various methods used when joining two sheets in a conventionally known method for manufacturing an absorbent article can be used. For example, it is preferably performed by at least one method selected from the group consisting of hot embossing, ultrasonic fusion, adhesion with a hot melt adhesive, and adhesion with a thermoplastic resin.

  For example, when joining a 1st elongate sheet and a 2nd elongate sheet | seat by heat | fever embossing, let the 2nd elongate sheet | seat side comprised with a film etc. be a plain surface of embossing, and it is comprised with a nonwoven fabric etc. The first long sheet side is preferably an embossed surface. By comprising in this way, the lamination sheet of a favorable texture can be obtained. Such joining by hot embossing is preferably performed at a temperature not higher than the melting point of the film constituting the second long sheet.

  Moreover, when joining a 1st elongate sheet and a 2nd elongate sheet by ultrasonic fusion, the pattern of ultrasonic fusion is given to the 1st elongate sheet side comprised by a nonwoven fabric etc. preferable. In addition, the hot melt adhesive is bonded by pattern coating (for example, hot melt printing) on the surface of at least one of the first long sheet and the second long sheet. Is preferably applied. Moreover, in joining by a thermoplastic resin, it is preferable to join by heat-bonding sheets after applying a pattern of the thermoplastic resin. According to these methods, two sheets can be joined well. Moreover, the texture of the obtained laminated sheet is also good.

  Hereinafter, the manufacturing method of the laminated sheet for absorbent articles of this invention is demonstrated in detail. In the method for producing a laminated sheet for absorbent articles of the present invention, as shown in FIG. 1, a first supply roll 23 for supplying a first long sheet 11 made of a nonwoven fabric and a second made of a liquid-impermeable material. A second supply roll 27 that supplies the long sheet 12 is mounted on the laminated sheet manufacturing apparatus 100, and the sheets 11 and 12 are supplied from the supply rolls 23 and 27.

  At this time, the first long sheet 11 and the second long sheet 12 are sent out in the longitudinal direction X of the sheet. In the manufacturing method of the laminated sheet for absorbent articles of the present invention, it is preferable to send out each sheet so that the feeding amount (also referred to as feeding amount) of each sheet is different, with respect to the feeding amount of the second long sheet 12. Thus, it is more preferable to increase the feed amount of the first long sheet 11.

  The “feed amount” of the sheet refers to the length of the sheet that is fed from a supply roll that supplies the sheet in a non-expanded state. That is, the length of the long sheet supplied from the first supply roll 23 and the second supply roll 27 as shown in FIG.

  For the amount of the second long sheet 12 to be sent out, after the second long sheet 12 is sent out, the second long sheet 12 is elastically stretched so that each sheet (ie, The first long sheet 11 and the extended second long sheet 12a) are set to have the same length.

  The feeding amount of the first long sheet and the feeding amount of the second long sheet are appropriately determined according to the size of the slack portion of the obtained laminated sheet (that is, the amount by which the first long sheet can be slackened). can do. That is, the amount by which the second long sheet 12 is reduced becomes a slack portion of the laminated sheet. For example, although not particularly limited, it is preferable to set the first long sheet feed amount in a non-stretched state to 103 to 120% when the second long sheet feed amount is 100%. More preferably, it is 105 to 120%.

  By constituting in this way, a slack part is satisfactorily formed in the 1st long sheet by contraction of the 2nd long sheet, and the lamination sheet which has a soft texture can be obtained. If the amount of the first long sheet fed exceeds 120%, the slack portion of the first long sheet becomes excessively large, and conversely, the texture of the laminated sheet may be impaired. In addition, the second long sheet is excessively stretched, and the second long sheet may be damaged. On the other hand, if the feed amount of the first long sheet is less than 105%, the difference in the feed amount between the first long sheet and the second long sheet is too small to form a sufficiently large slack portion. Sometimes.

  Next, in the method for producing a laminated sheet for absorbent articles of the present invention, as shown in FIGS. 1 and 2, the first long sheet 11 and the second long sheet 12 having different delivery amounts are laminated and At the time of joining, at least the second long sheet 12 is more elastically stretched in the longitudinal direction X than the first long sheet 11 so that the conveyed lengths of the respective sheets are the same.

  When the second long sheet 12 with a small amount of feed is stretched in accordance with the feed amount of the first long sheet 11, for example, as shown in FIG. The tension state can be controlled by adjusting the tension.

  In FIG. 1, an example in which a nip roll 43 is arranged in front of the joining roll 29 and the feeding amount of the second long sheet 12 is adjusted by the nip roll 43 is shown. A dancer roll 41 for detecting the sheet tension is disposed further upstream of the nip roll 43.

  The dancer roll 41 includes two intermediate rolls 41b and 41b and a displacement roll 41a provided between the intermediate rolls 41b and 41b so as to be movable up and down. The tension acting on the second long sheet 12 changes. Then, according to the change, the displacement roll 41a is displaced up and down. For this reason, the tension acting on the second long sheet 12 can be kept constant by adjusting the feed amount of the second long sheet 12 so that the vertical position of the displacement roll 41a is kept constant.

  Further, in FIG. 1, even in the first long sheet 11 supplied from the first supply roll 23, the tension of the first long sheet 11 is detected using the dancer roll 42 (the displacement roll 42 a and the intermediate roll 42 b). And the example at the time of being comprised so that the sending amount of the 1st elongate sheet | seat 11 may be controlled based on this detection signal is shown. As a result, not only the feeding amount of the second long sheet 12 but also the feeding amount of the first long sheet 11 is controlled, so that the second long sheet 12 can be easily and reliably transferred to the first long sheet 12. 11 can be extended.

  The dancer roll 41 is provided with a sensor (not shown) that detects the vertical position of the displacement roll 41a, and tension during the conveyance of the second long sheet 12 (that is, the vertical position of the displacement roll 41a). Can be detected (adjusted) by the sensor, and the delivery amount of the second long sheet 12 can be adjusted (controlled) based on the detection signal transmitted from the sensor. In other words, the dancer roll 41 detects a change in tension associated with the control of the amount of the second long sheet 12 and the amount of the second long sheet 12 (in other words, the speed of delivery) is determined based on the detection result. By controlling, the extended state of the second long sheet 12 can be kept constant.

  Further, the method for controlling the feeding amount of the second long sheet is not limited to the method for detecting the displacement of the dancer roll with a sensor and detecting the tension of the second long sheet. The pressure acting on the dancer roll may be detected using a pressure sensor to detect the tension of the second long sheet 12. Further, instead of the dancer roll, an intermediate roll having a pressure sensor may be provided, and the tension of the second long sheet may be detected by the pressure sensor via the intermediate roll.

  Reference numerals 45 and 46 denote drive rolls for conveying each long sheet, and reference numeral 47 denotes a guide roll for guiding the feeding direction of the first long sheet 11. Reference numerals 48 and 49 denote touch rolls arranged so as to abut against the first supply roll 23 or the second supply roll 27. The touch rolls 48 and 49 are separately provided with a driving roll (not shown), and the touch rolls 48 and 49 are rotated via a belt or the like to rotate the first supply roll 23 or the second supply roll 27. A long sheet can be sent out from each supply roll.

  In FIG. 1, the second long sheet 12 is nipped and conveyed by the nip roll 43, but the second long sheet 12 can be elastically extended in cooperation with the touch roll 48. For example, instead of the nip roll 43, an intermediate roll around which the second long sheet 12 is wound about a half circumference is provided, and the second long sheet 12 is provided by the cooperative action of the intermediate roll and the touch roll 48. The sheet 12 may be elastically stretched. In this case, the feed amount of the second long sheet 12 by the touch roll 48 is controlled based on the displacement amount of the dancer roll 41.

  The reason why the second long sheet 12a is elastically stretched as described above is to make the transported lengths of the respective sheets the same at the time of lamination and joining. Thus, the extension length or extension rate of the second long sheet 12a is determined. The first long sheet 11 may be stretched in the longitudinal direction X, or may not be stretched, that is, may be in a non-stretched state. When the first long sheet 11 is extended, it is necessary to further elastically extend the second long sheet 12a in accordance with the extended length.

  As described above, the elongation ratio of the second long sheet can be appropriately determined according to the feed amount of each sheet. However, in the method for producing a laminated sheet for absorbent articles of the present invention, the second long sheet is used. Is preferably elastically stretched to a length of 103 to 120% when the length in the non-stretched state is 100%.

  By comprising in this way, a slack part is favorably formed in a 1st elongate sheet by shrinkage | contraction of a 2nd elongate sheet. If the amount is less than 103%, a slack portion having a sufficient size may not be formed. On the other hand, if the amount exceeds 120%, the slack portion of the first long sheet becomes excessively large. It may be damaged. In addition, the second long sheet may be damaged.

  Next, in the manufacturing method of the laminated sheet for absorbent articles of the present invention, the first long sheet 11 and the stretched second long sheet 12a are intermittently provided in the longitudinal direction X of the sheets 11 and 12a. To obtain a laminated sheet 13 in which the first long sheet 11 and the second long sheet 12a are laminated. When the extension of the second long sheet 12a is released, the surface side of the first sheet 11b rises and the slack portion 14 is formed at this intermittently joined interval (see FIG. 4). .

  The sheet joining method is not particularly limited, and as described above, for example, at least one method selected from the group consisting of heat embossing, ultrasonic fusion, adhesion using a hot melt adhesive, and adhesion using a thermoplastic resin. Is preferably performed. In addition, when performing heat fusion, such as hot embossing, it is preferable to carry out at the temperature below the melting | fusing point of a sheet | seat. Moreover, in embossing, it is preferable to form the embossed unevenness on the first long sheet side serving as a cover sheet or the like. Under the present circumstances, it is preferable that the 2nd elongate sheet | seat side used as a back sheet uses a roll of a play surface (flat surface), and an unevenness | corrugation is not formed. By comprising in this way, the surface by the side of a back seat which contacts a wearer becomes flat, and a skin touch becomes favorable.

  In addition, when joining sheets at least intermittently in the longitudinal direction X of the sheet, the length of the part that is actually joined (the length in the longitudinal direction of the sheet) There is no restriction | limiting in particular about the space | interval of a part, It can determine suitably considering the pitch (interval) of the slack part formed in the lamination sheet obtained, etc.

  As shown in FIGS. 3 and 4, the interval P when intermittently joining the sheets 11 and 12 a in the longitudinal direction is preferably, for example, 5 to 10 mm, and more preferably 5 to 8 mm. preferable. By comprising in this way, the lamination sheet 13b which has a very soft texture can be obtained. In addition, when the said space | interval P is less than 5 mm, the slack part 14 will be formed excessively and a favorable texture may not be implement | achieved, and when it exceeds 10 mm, the slack part 14 of the laminated sheet 13b It may spread in the longitudinal direction and the slack portion 14 may extend. The interval P at the time of joining is an interval in the state in which the second long sheet 12a is stretched. When the second long sheet 12a contracts, the interval P ′ is the second long sheet 12a. It decreases according to the contraction amount of the length sheet 12a.

  When the sheets 11 and 12a are joined intermittently, any sheet may be joined at least in the longitudinal direction of the sheet, but as shown in FIG. That is, the sheet may be intermittently joined also in the sheet width direction Y). By comprising in this way, a slack part is formed also in the width direction Y of a sheet | seat, and the laminated sheet 13 with rich texture can be obtained. Of course, the joining may be performed intermittently in the longitudinal direction of the sheet and continuously in the width direction of the sheet. In this case, slack portions that are long in the width direction of the sheet are intermittently formed in the longitudinal direction of the sheet.

When intermittently bonded to the width direction of the sheet, as shown in FIG. 2, than the length to Q ₁ junctions intermittently joined in the longitudinal direction X of the sheet, perpendicular to the longitudinal direction of the sheet direction of the joint portion to be intermittently bonded to the (width direction Y of the sheet) the length Q ₂ is preferably set to large. By comprising in this way, a slack part can be favorably formed in a lamination sheet, and two sheets can be joined favorably. For example, as the length to _{Q 1} junction portion, can be set to 0.5 to 2.5 mm, the length _{Q 2} of the joint portion can be set to 1 to 5 mm.

  Next, the produced long laminated sheet 13 is cut at a predetermined interval in the longitudinal direction to produce a plurality of laminated sheets 13 for absorbent articles.

  The manufacturing apparatus 100 shown in FIG. 1 includes a cutting part 33 that cuts the long laminated sheet 13 at a predetermined interval in the longitudinal direction X to form an absorbent article laminated sheet 13c. Specifically, a cutter or the like can be used. The “predetermined interval” can be appropriately determined according to the type of the absorbent article.

  In the laminated sheet 13 for absorbent articles cut in this way, the second sheet that has been elastically stretched (the second long sheet that has been cut) contracts to the original length. One sheet (cut first long sheet) is loosened. That is, compared with the second sheet that has been elastically stretched, the first sheet has a longer length in the non-stretched state. The slack becomes a slack portion where the surface side of the first sheet rises intermittently. Thus, the laminated sheet for absorbent articles which has a soft texture and can be used suitably as a sheet | seat arrange | positioned on the outer side of an absorbent article can be manufactured simply.

  In the above manufacturing method, it has been described that the elongated state of the second sheet is released by cutting the long laminated sheet 13 and the second sheet contracts, but for example, the first long sheet and the second sheet are contracted. After the joining with the long sheet, if the stretched state of the long laminated sheet (that is, the stretched state of the joined second long sheet) is released, in the long laminated sheet, the first A slack portion is formed on the surface of the long sheet.

[2] Laminated sheet for absorbent articles:
Next, an embodiment of the laminated sheet for absorbent articles of the present invention will be described in detail. The laminated sheet for absorbent articles of the present invention is an absorbent article laminated sheet obtained by the method for producing an absorbent article laminated sheet described so far. That is, as shown in FIG. 5, a first sheet 51 made of a nonwoven fabric and a second sheet 52 made of a liquid-impermeable material are laminated, and the first sheet 51 and the second sheet 52 are at least one. The absorbent sheet laminate sheet 60 is intermittently bonded in the direction of the first sheet 51 in the non-stretched state between the bonded portions 55 bonded intermittently. 55 is larger than the length of the second sheet 52 in the non-stretched state existing between 55, and has a slack portion 54 in which the surface side of the first sheet 51 rises intermittently between the joint portions 55. Yes. Here, FIG. 5 is a perspective view schematically showing one embodiment of the laminated sheet for absorbent articles of the present invention.

  In addition, in FIG. 5, although the example in case the slack part 54 is arrange | positioned so that it may align with the width direction of a sheet | seat is shown, For example, like the laminated sheet 61 for absorbent articles shown in FIG. The slack portions 54 may be arranged in a staggered manner in the width direction of the sheet. By disposing the slack portion 54 in this way, a laminated sheet having a better texture can be obtained. Here, FIG. 6 is a perspective view schematically showing one embodiment of the laminated sheet for absorbent articles of the present invention.

  This laminated sheet for absorbent articles can be used as a sheet constituting the absorbent article, and specifically can be used as a sheet constituting the outer surface of a urine pad or disposable diaper. More specifically, the first sheet of the laminated sheet for absorbent articles can be used as a cover sheet such as a disposable diaper, and the second sheet can be used as a back sheet such as a disposable diaper.

  For example, as a disposable diaper, an absorbent body, a top sheet that is disposed so as to cover the surface of the absorbent body, at least partially made of a liquid-permeable material, and a back surface of the absorbent body are disposed. In addition, there is a back sheet made of a liquid-impermeable material, and a cover sheet made of a nonwoven fabric or the like disposed on the outer side (back side) of the back sheet, and the laminated sheet for absorbent articles of the present invention is It can be used for the back sheet and the cover sheet. Under the present circumstances, the slack part of the laminated sheet for absorbent articles is arrange | positioned on the outer side of a cover sheet, and can give a soft texture to a disposable diaper. Moreover, the laminated sheet for absorbent articles of the present invention is not used as a composite sheet of a back sheet and a cover sheet, but simply as a back sheet, for example, a back sheet in which a function such as a cover sheet is added to the back sheet. You can also.

[3] Absorbent articles:
Next, one embodiment of the absorbent article of the present invention will be described taking a disposable diaper as an example. In the absorbent article of the present invention, the laminated sheet for absorbent articles described so far is used for the back sheet which is one of the components of the absorbent article. Here, FIG. 7 is a partially cutaway plan view schematically showing a state in which one embodiment of the disposable diaper as the absorbent article of the present invention is viewed from the top sheet side, and FIG. 8 is the present invention. It is a top view showing typically the state which looked at one embodiment of a disposable diaper as an absorptive article from the back sheet side.

  As shown in FIGS. 7 and 8, the disposable diaper 200 as an absorbent article of the present invention is composed of the front body 102, the crotch 104, and the back body 106, and the absorbent body 122 and at least a part thereof are liquid. A top sheet 118 made of a permeable material and arranged to cover the surface of the absorber 122; a back sheet 120 made of a liquid impermeable material and arranged to cover the back surface of the absorber 122; It is equipped with. And as above-mentioned, the laminated sheet for absorbent articles of this invention demonstrated so far is used for at least one part of the back sheet 120 of a diaper.

  In this disposable diaper, a soft texture can be given to a disposable diaper by using so that the slack part of the said laminated sheet for absorbent articles may be arrange | positioned on the outer side of a diaper.

  In FIGS. 7 and 8, a fastening tape 110 is further provided for fixing the front body 102 and the back body 106 so as to extend from the left and right side edges 106 a and 106 b of the back body 106. Although the example in the case of the provided tape type diaper is shown, it is not limited to such a tape type diaper, For example, it is applicable also to a pants type diaper.

  In addition, a "pants-type diaper" is a pants-type diaper that is formed with one waist opening and a pair of leg openings by joining corresponding side edges of the front and back of the diaper. It is a diaper made up of. On the other hand, as shown in FIG. 7, the “tape-type diaper” includes a fastening tape 110 for fixing the front body 102 and the back body 106, and this fastening tape 110 is passed through the side of the wearer. Thus, the diaper is configured to be worn by being fastened to a fastening region 113 disposed in the front body 102 of the diaper.

  Moreover, in this specification, when wearing a diaper to a wearer, the part which covers a wearer's belly side (front side of the body, the back body) means wearing a diaper to the wearer. When the wearer wears a diaper, the part that covers the wearer's crotch, especially in the unfolded disposable diaper In addition, it means a portion excluding the front body and the back body where an R-shaped notch that forms a leg opening is formed.

[3-1] Absorber:
The “absorber” is a member for absorbing and holding the wearer's urine and the like, and is made of an absorbent material. The absorber is sandwiched between the top sheet and the back sheet, and is used in an integrated state with both sheets.

  Examples of the “absorbent material” include fluff pulp, super absorbent polymer (hereinafter referred to as “SAP”), a hydrophilic sheet, and the like. “Fluff pulp” is made by pulverizing wood pulp or non-wood pulp into cotton, “SAP” is sodium polyacrylate, “Hydrophilic sheet” is tissue, absorbent paper, hydrophilized It is preferable to use a non-woven fabric that has been treated.

  As the absorber, it is preferable to use one or two or more absorbent materials formed into a single-layer or multi-layer mat. Especially, what combined 10-500 mass parts SAP with respect to 100 mass parts of fluff pulp is preferable. At this time, the SAP may be mixed in the fluff pulp mat or used in a layered manner between the fluff pulp mats.

[3-2] Top sheet:
A top sheet is a sheet | seat arrange | positioned so that the surface (surface located in a wearer's skin side at the time of mounting | wearing) may be coat | covered. Since the top sheet needs to allow the wearer's urine or the like to pass therethrough, at least a part (all or a part) of the top sheet is made of a liquid-permeable material.

  Examples of the “liquid permeable material” include woven fabric, non-woven fabric, and porous film. Among these, it is preferable to use a nonwoven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, aliphatic polyamide, etc., which has been subjected to a hydrophilic treatment.

  As the “nonwoven fabric”, a nonwoven fabric produced by a production method such as air through (card hot air) or card embossing can be suitably used. The “hydrophilic treatment” can be performed by applying, spraying, impregnating, etc. a surfactant.

  The top sheet is preferably “at least partly”, more specifically, when the top sheet is viewed in plan, at least the vicinity of the surface of the absorber is made of a liquid-permeable material.

[3-3] Backsheet:
A backsheet is a sheet | seat arrange | positioned so that the back surface (surface located in the side far from a wearer's skin at the time of mounting | wearing) may be coat | covered. The backsheet is composed of a liquid-impermeable material because it is necessary to prevent the wearer's urine from leaking to the outside. In the disposable diaper as the absorbent article of the present invention, The 2nd sheet | seat (2nd sheet | seat consisting of a liquid-impermeable material) of the laminated | stacked sheet | seat for absorbent articles demonstrated in (2) is arrange | positioned so that the back surface of an absorber may be coat | covered at least, and functions as a back sheet substantially.

  As shown in FIG. 5, the laminated sheet for absorbent articles is formed by laminating a first sheet 51 made of nonwoven fabric and a second sheet 52 made of a liquid-impermeable material, and the first sheet 51 and the second sheet. 52 is a laminated sheet 60 for absorbent articles that is intermittently bonded in at least one direction, and a slack portion 54 in which the surface side of the first sheet 51 rises intermittently between the bonded portions 55. have. In such a disposable diaper, it is preferable that the first sheet is used so as to be disposed outside the diaper.

[3-4] Other components:
The absorbent article of the present invention may further include various components employed in conventionally known disposable diapers, except that the laminated sheet for absorbent articles of the present invention is used as a back sheet. Good.

  For example, the absorbent article of the present invention may further include a three-dimensional gather to prevent side leakage of urine excreted by the wearer. The three-dimensional gather is a member for preventing side leakage of the urine excreted by the wearer, and is a leak-proof wall configured to stand up three-dimensionally. By forming such a three-dimensional gather, the three-dimensional gather serves as a breakwater, and leakage from a leg-diameter opening or the like (so-called “lateral leakage”) can be effectively prevented.

  The structure used for the conventional disposable diaper can be employ | adopted for the structure of a three-dimensional gather. A disposable diaper 200 shown in FIG. 7 has a pair of three-dimensional gathers 126 (126a, 126b) formed continuously from the crotch 104 to both the front body 102 and the back body 106 along the longitudinal direction of the diaper. An example is shown. Note that at least one pair of solid gathers must be formed, but two or more pairs may be formed.

  Moreover, in the absorbent article of the present invention, various elastic materials may be arranged in order to improve the fit to the wearer's skin. Examples of such an elastic material include a waist elastic material 130 and a leg elastic material 132 as shown in FIG.

  The method for producing a laminated sheet for absorbent articles of the present invention can be used as a method for producing a laminated sheet constituting the absorbent article. Moreover, the laminated sheet for absorbent articles of this invention can be used as a sheet | seat which comprises absorbent articles, such as a disposable diaper and a urine pad.

11: 1st long sheet (sheet), 11b: 1st long sheet (1st long sheet which has a slack part by contraction of a 2nd long sheet), 12: 2nd long sheet (sheet), 12a : Second long sheet (second long sheet in a stretched state), 12b: second long sheet (second long sheet in a contracted state), 13, 13b: laminated sheet for absorbent articles (laminated) Sheet), 14: slack part, 21: joining part, 23: first supply roll, 27: second supply roll, 29: joining roll, 29a: upper roll, 29b: lower roll, 33: cutting part, 35: Conveyor,
41, 42: Dancer roll, 41a, 42a: Displacement roll, 41b, 42b: Intermediate roll, 43: Nip roll, 45, 46: Drive roll, 47: Guide roll, 48, 49: Touch roll, 51: First sheet, 52: second sheet, 54: slack portion, 55: joined portion, 60, 61: laminated sheet for absorbent articles, 100: laminated sheet manufacturing apparatus for absorbent articles, 102: front body, 104: crotch, 106: Back body, 110: Fastening tape, 113: Fastening region, 118: Top sheet, 120: Back sheet, 122: Absorber, 126, 126a, 126b: Three-dimensional gather, 130: Elastic material around waist, 132: Leg circumference Elastic material, 200: disposable diaper.

Claims (10)

The first long sheet and the second long sheet are laminated in the longitudinal direction of each sheet in a state where the first long sheet made of a nonwoven fabric and the second long sheet made of a liquid-impermeable material are laminated. To obtain a laminated sheet in which the first long sheet and the second long sheet are laminated,
The first long sheet and the second long sheet are sent out in the longitudinal direction of the sheet, and the second long sheet is longer than the first long sheet in the longitudinal direction of the second long sheet. The manufacturing method of the laminated sheet for absorbent articles which joins the said 1st elongate sheet and the said 2nd elongate sheet intermittently in the state extended | stretched to the direction.   The second long sheet is intermittently joined to the first long sheet in a state where the second long sheet is stretched to a length of 103 to 125% when the length in the non-stretched state is 100%. Item 2. A method for producing a laminated sheet for absorbent articles according to Item 1.   3. The absorbent article according to claim 1, wherein a feeding amount of the first long sheet is 103 to 120% when a feeding amount of the second long sheet in a non-stretched state is 100%. A method for producing a laminated sheet.   The absorbent article according to any one of claims 1 to 3, wherein an interval between the first long sheet and the second long sheet is 5 to 15 mm in a longitudinal direction of the sheet. A method for producing a laminated sheet.   The said 1st elongate sheet | seat and the said 2nd elongate sheet | seat are intermittently joined also to the direction orthogonal to the longitudinal direction of the said sheet | seat intermittently in the longitudinal direction of the said sheet | seat. The manufacturing method of the laminated sheet for absorbent articles as described in any one of Claims.   The absorptivity according to claim 5, wherein the length of the joining portion that is intermittently joined in a direction orthogonal to the longitudinal direction of the sheet is larger than the length of the joining portion that is intermittently joined in the longitudinal direction of the sheet. A method for producing a laminated sheet for articles.   At least one method selected from the group consisting of heat embossing, ultrasonic fusion, adhesion with a hot melt adhesive, and adhesion with a thermoplastic resin for bonding the first long sheet and the second long sheet. The manufacturing method of the laminated sheet for absorbent articles as described in any one of Claims 1-6 performed by these.   The adhesion between the first long sheet and the second long sheet is hot embossing, and an uneven pattern by the heat embossing is formed on the surface side on which the first long sheet is disposed. Manufacturing method of laminated sheet for absorbent articles. Absorption formed by laminating a first sheet made of a nonwoven fabric and a second sheet made of a liquid-impermeable material, and the first sheet and the second sheet are intermittently joined in at least one direction. A laminated sheet for a functional article,
The length in the non-stretched state of the first sheet existing between the joint portions joined intermittently is larger than the length in the non-stretched state of the second sheet existing between the joint portions, The laminated sheet for absorbent articles which has the slack part which the surface side of the 1st sheet rose | swelled intermittently between the junction parts. An absorber, at least partly made of a liquid-permeable material, a top sheet arranged to cover the surface of the absorber, and a liquid-impermeable material so as to cover the back surface of the absorber A backsheet disposed,
An absorbent article in which the laminated sheet for absorbent articles according to claim 9 is used as at least a part of the back sheet.

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