Individually packaged absorbent article and packaging sheet

Abstract

An individually packaged absorbent article is obtained by individually packaging an absorbent article with a packaging sheet made of paper, and the packaging sheet is folded to the inner surface side in the longitudinal direction of the packaging sheet together with the absorbent article provided on the inner surface of the packaging sheet. Both edge portions in a short-side direction perpendicular to the long-side direction are sealed, the tensile strength of the packaging sheet in at least the long-side direction is 15 N / 25 mm or less, and the tensile strength of the packaging sheet is Sw, Sslt, where Ss is the peel strength between the packaging sheets at the sealed portion; sw.

Description

Technical Field

[0001] The present invention relates to individually packaged absorbent articles and packaging sheets. Background Art

[0002] Many absorbent articles such as sanitary napkins, panty liners, and incontinence pads are individually packaged with packaging sheets for reasons of hygiene during storage and convenience during carrying, and are provided as individually packaged absorbent articles (individual packages) in a sealed state. The packaging structure of individually packaged absorbent articles is generally such that, for example, the absorbent article is placed on the inner surface of the packaging sheet, and the packaging sheet is folded to the inner surface side together with the absorbent article, and both edges are sealed.

[0003] As materials for packaging sheets, resin films, nonwoven fabrics, and the like are still the mainstream, but packaging sheets made of paper are also known (for example, Patent Document 1).

[0004] [Prior art literature]

[0005] [Patent Literature]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2022-24624 Summary of the invention

[0007] [Problems to be solved by the invention]

[0008] Paper packaging sheets have attracted attention in recent years, especially from the perspective of sustainable development goals. However, due to the fact that paper is more prone to breakage than other materials, it is not widely used in practice. Here, in order to prevent the breakage of paper packaging sheets, for example, it is considered to use strong paper packaging sheets with a grammage and / or a large thickness, but such strong packaging sheets are prone to friction noise when being carried or opened, and thus users sometimes do not like it.

[0009] Therefore, a structure is required in which the packaging sheet is unlikely to generate noise when touched and the packaging sheet is unlikely to be broken when the seal of the individually packaged absorbent article is peeled off during unpacking.

[0010] In view of the above, an object of one embodiment of the present invention is to provide a structure in which, in an individually packaged absorbent article formed using a paper packaging sheet, the packaging sheet is less likely to make a sound when touching and is less likely to be broken when opening.

[0011]

Methods to solve the problem

[0012] One embodiment of the present invention is an individually packaged absorbent article in which an absorbent article is individually packaged by a paper packaging sheet, wherein the packaging sheet is folded to the inner surface side in the long side direction of the packaging sheet together with the absorbent article arranged on the inner surface of the packaging sheet, and the two edge portions in the short side direction perpendicular to the long side direction are sealed to form a sealed portion, and the tensile strength of the packaging sheet in at least the long side direction is 15N / 25mm or less, and the peel strength of the packaging sheets on the sealed portion is Ss, and the tensile strength of the packaging sheet is Sw, Ss <Sw。

[0013] [Effects of the Invention]

[0014] According to one aspect of the present invention, in an individually wrapped absorbent article formed of a paper wrapping sheet, a structure is obtained in which the wrapping sheet is unlikely to make a sound when touching and the wrapping sheet is unlikely to be broken when opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0015]

Figure 1

[0016]

Figure 2

[0017]

Figure 3

[0018]

Figure 4

[0019]

Figure 5

[0020]

Figure 6

[0021] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in each of the drawings, the same or corresponding structures may be given the same reference numerals and the description thereof may be omitted unless otherwise specified.

[0022] <Basic structure of individually packaged absorbent articles>

[0023] First, the basic structure of the individually packaged absorbent article will be described. Figure 1 A plan view of an individually packaged absorbent article 100 is given in FIG. Figure 2 In the given Figure 1The plan view of the individually packaged absorbent article in the unfolded state is a view of the absorbent article 1 viewed from the inner surface of the packaging sheet 10 or from the skin side. Figure 3 Given in Figure 1 II line cross section.

[0024] like Figure 1 to Figure 3 As shown, the individually packaged absorbent article 100 comprises a packaging sheet 10 and an absorbent article 1 individually packaged by the packaging sheet 10. Figure 2 As shown, the packaging sheet 10 may be in an elongated shape in the unfolded state, having a long side direction (longitudinal direction) D1 and a short side direction (lateral direction) D2 perpendicular to the long side direction. The long side direction D1 and the short side direction D2 of the packaging sheet 10 correspond to the long side direction and the short side direction of the absorbent article 1, respectively. In addition, in the state of individually packaging the absorbent article 100, the long side direction D1 of the packaging sheet 10 is sometimes referred to as the unsealing direction, and the short side direction D2 is sometimes referred to as the width direction.

[0025] (Absorbent articles)

[0026] The absorbent article 1 packaged by the packaging sheet 10 may be a flat and elongated article to be worn facing the discharge outlet of body fluids (menstrual blood, vaginal discharge, urine, etc.). Specific examples of the absorbent article 1 may be sanitary napkins, panty liners (vaginal discharge sheets), and panty liners for light incontinence. In this specification, the absorbent article is mainly described based on the example of a sanitary napkin.

[0027] Absorbent article 1 such as Figure 2 As shown, the structure may include a liquid-permeable top sheet 3, a liquid-impermeable back sheet (not shown), and an absorbent body 4 disposed between the top sheet 3 and the back sheet.

[0028] As the back sheet, a sheet having at least water-blocking properties, such as an olefin resin sheet such as polyethylene or polypropylene, can be used. A laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or a laminated sheet obtained by ensuring substantial liquid-impermeability of a nonwoven fabric through a waterproof film, etc. can be used. In addition, a sheet having moisture permeability can be used.

[0029] As the top sheet 3, it is suitable to use a porous or non-porous nonwoven fabric, a porous plastic sheet, etc. As the material fiber constituting the nonwoven fabric, for example, olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, regenerated fibers such as rayon and cuprammonium yarn and their blended fibers, and natural fibers such as cotton can be used alone or in combination of two or more.

[0030] The absorbent body 4 is not limited as long as it is a material that can absorb and retain body fluids, but preferably contains cotton pulp and absorbent polymers. As absorbent polymers, superabsorbent polymer granular powder (superabsorbent polymer (SAP)), superabsorbent polymer fiber (superabsorbent fiber (SAF)) and combinations thereof can be used. As pulp, cellulose fibers such as chemical pulp and dissolving pulp obtained from wood, artificial cellulose fibers such as rayon and acetate can be cited. As pulp, hardwood pulp obtained from hardwood, softwood pulp obtained from softwood or mixed pulp thereof can be cited. In addition, the pulp can be recycled pulp regenerated from used pulp.

[0031] The thickness of the absorbent body 4 may be 0.5 to 25 mm. The absorbent body 4 may be structured so that the area corresponding to the body fluid discharge outlet (body fluid discharge outlet corresponding area) and the area behind the body fluid discharge outlet corresponding area facing the groove of the buttocks are bulged. The absorbent body 4 has a size and shape that does not exceed the top sheet 3 and the back sheet, and the outer edges of the back sheet and the top sheet 3 are bonded by adhesives such as hot melt adhesives, heat sealing, ultrasonic sealing, etc. at the front and rear edge portions of the absorbent body.

[0032] like Figure 2 As shown, side sheets 7, 7 may be provided on the outer side of the side portion of the absorbent body 4 at both ends in the short direction D2 along the long direction D1. As the side sheet 7, a water-repellent nonwoven fabric or a hydrophilic nonwoven fabric may be used.

[0033] In addition, if Figure 1 to Figure 3 In the example shown, the absorbent article 1 is a so-called wingless type without wings, but it may be configured as a winged article having wings extending from the sides. The wings can be formed by bonding the side sheets and the back sheet.

[0034] In addition, a back sheet side (non-skin side, i.e., the side facing the underwear when worn) of the absorbent article 1 may be provided with an anti-drift adhesive portion for preventing the absorbent article 1 from drifting from the underwear when the absorbent article 1 is attached to the underwear. The anti-drift adhesive portion may be formed into a plurality of strips extending in the long side direction D1 or the short side direction D2.

[0035] The total length of the absorbent article 1 may be 140 to 430 mm, and the width of the absorbent article 1 (the width of the main body excluding the wings when the wings are provided) may be 40 to 130 mm.

[0036] (Packaging Sheet)

[0037] The packaging sheet 10 in the present embodiment is made of paper. By using the packaging sheet 10 made of paper, it is possible to contribute to the reduction of plastics and to the achievement of sustainable development goals. In addition, paper can give a unique style, such as the appearance and feel of the soft impression of natural materials. In addition, in this specification, paper refers to plant fibers and other fibers bonded with adhesives into a thin flat plate. In particular, it can refer to plant fibers as the main raw material, for example, the plant fibers, especially cellulose fibers, in the fibers contained are more than 50%, preferably more than 80%. The plant fiber (pulp) as the raw material of paper may contain wood pulp, non-wood pulp, and old paper pulp, which may be any one of mechanical pulp and chemical pulp. The pulp may be pulp recycled from the structural components of absorbent articles and / or the packaging sheets for absorbent articles. In addition, additives may be added to the paper. As specific examples of paper, various types of paper such as Western paper, Japanese paper, processed paper, and synthetic paper can be cited. Furthermore, the paper used in other applications in the past may be, for example, paper called newspaper, printing paper (including high-quality paper), note paper, drawing paper, packaging paper, thin paper, mixed paper, etc. In the case of thin paper, it may be thin imitation paper, Indian paper, rice paper, glassine paper, facial tissue, toilet paper, filter paper, etc.

[0038] In addition, in this specification, the paper packaging sheet refers to a sheet mainly composed of the above-mentioned paper. Among the paper packaging sheets, there are obviously packaging sheets composed only of paper, and laminated sheets composed of sheets composed of paper and materials other than paper may also be included. When the packaging sheet 10 contains a sheet composed of a material other than paper, the material other than paper may be a resin film, a non-woven fabric, etc. However, the case where the packaging sheet 10 is composed only of paper is particularly preferred from the perspective of reducing plastics and / or based on the perspective of giving the product a unique natural style of paper.

[0039] The paper packaging sheet 10 may be subjected to certain processing. Such processing may include, for example, pleating, embossing, calendering, waterproofing, slitting, laminating, printing, etc. By performing pleating, embossing, etc., the strength and / or flexibility of the paper may be improved. In addition, by performing waterproofing (e.g., applying a waterproofing agent containing silicone resin, paraffin resin, fluororesin, etc.), the antifouling function may be improved. In addition, when waterproofing is performed on one side of the anti-deviation adhesive portion facing the back side of the absorbent article 1, the packaging sheet 10 may be contacted with the anti-deviation adhesive portion without peeling off the sheet.

[0040] The size of the packaging sheet 10 corresponds to the size and shape of the packaged absorbent article 1. For example, when the packaging sheet 10 is fully unfolded (unfolded), the length of the long side D1 (sometimes simply referred to as the length) can be 100 to 450 mm, and the length of the short side D2 (sometimes simply referred to as the width) can be 70 to 250 mm. In the example shown in the figure, the packaging sheet 10 has a rectangular shape in the unfolded state, but it can also have a shape such as an oblong oval.

[0041] <Basic packaging structure for individually packaged absorbent articles>

[0042] like Figure 1 to Figure 3 As shown in FIG. 1 , the absorbent article 1 is packaged by folding it together with the packaging sheet 10 to form a separately packaged absorbent article 100. When folded, as shown in FIG. Figure 2 As shown, in the following state, the absorbent article 1 is placed on the inner surface of the packaging sheet 10 so that the back sheet side of the absorbent article 1 faces it. Then, the packaging sheet 10 and the absorbent article 1 are folded together in the long side direction D1 based on the first fold line F1 and the second fold line F2 along the width direction D2. More specifically, based on the first fold line F1, the first region R1 including one end 11 of the long side direction D1 of the packaging sheet 10 is folded in the long side direction D1, and based on the second fold line F2, the second region R2 including the other end 12 of the long side direction D1 of the packaging sheet 10 is folded. The area between the first region R1 and the second region R2 of the packaging sheet 10 is the third region R3. In the example shown in the figure, the packaging sheet 10 is folded in such a manner that the second region R2 is folded first, and the first region R1 is overlapped on the outer surface of the second region R2 ( Figure 1 and Figure 2 ), or the folding order of the first region R1 and the second region R2 may be reversed. In this way, the packaging sheet 10 is folded into three parts together with the absorbent article 1 (inner three-fold), and after wrapping the absorbent article 1, the two edge parts in the short side direction D2 are sealed along the long side direction D1 to form the sealed parts 15,15.

[0043] Such a packaging form of three or more folds can be formed relatively simply, and the absorbent article 1 can be hygienically wrapped, and it is also easy to take out the absorbent article 1. In addition, the folding form is not limited to three folds, and can be four or more folds, or two folds.

[0044] (Seal part)

[0045] like Figure 1As shown, in the individually packaged absorbent article 100, the positions where the absorbent article 1 does not exist at both edges in the short side direction D2 are sealed to form sealing portions 15, 15. The sealing portions 15, 15 can be formed along the entire length of the long side direction D1 of the individually packaged absorbent article 100. This can prevent garbage, dust, or fingers or small objects from accidentally invading from the end edge in the short side direction (obtaining sealing properties), which is preferred from this point of view. For example, the sealing portions 15, 15 are formed by inserting a pair of rollers and applying pressure through the two rollers, thereby pressing the packaging sheets 10 together in the thickness direction (described later).

[0046] The range of the short side direction D2 of the sealing portion 15 may be 20 mm from the end edge of the short side direction D2. The sealing portion 15 may be formed in the entire range or in a part of the range, for example, at a position away from the end edge of the short side direction D2. The length (width) of the sealing portion 15 in the short side direction D2 is preferably 3 to 15 mm.

[0047] Figure 4 An enlarged view of part II including the sealing portion 15 is given. Figure 4 As shown, the sealing portion 15 may include a plurality of pressing portions (or bonding portions) 15a, 15a... that are separated from each other when viewed from above. Each pressing and bonding portion 15a, 15a... is a portion where the packaging sheets 10 are bonded to each other in the thickness direction by pressing. In the illustrated example, the portion other than the plurality of pressing portions 15a, 15a... is a non-bonding portion where the packaging sheets 10 are not bonded to each other. In this way, the pressing portions 15a, 15a... are separated from each other and exist in a dotted form. Therefore, compared with the case where the packaging sheets 10 are continuously bonded to each other along the entire surface of the sealing portion 15, for example, it is easier to peel off the packaging sheets when opening, and the opening property can be improved. In addition, it is also possible to prevent the two edges of the individually packaged absorbent article 100 from becoming excessively hard and damaging the feel.

[0048] In addition, one of the pressing parts 15a, 15a... has a top view shape such as Figure 4 The example shown is a square, but the shape is not limited to the one shown in the figure. For example, it can be a quadrilateral other than a square such as a rectangle, a parallelogram, a polygon other than a quadrilateral, a circle, an ellipse, a heart, a star, a teardrop, etc. In addition, in the sealing part 15, the size of one pressing part 15a can be a square with a side of 0.25 to 2.5 mm, or a size with an area equivalent thereto. In addition, the arrangement of multiple pressing parts 15a, 15a... can also be as follows Figure 4 The grid shape shown may also be a staggered shape.

[0049] (Fixed belt)

[0050] like Figure 1As shown in FIG. 1 , in the individually wrapped absorbent article 100, a fixing belt 30 may be provided near the edge of the first region R1 (one end 11 of the packaging sheet 10) and in the center of the short side direction D2. Then, the fixing belt 30 may be provided as shown in FIG. Figure 1 As shown, the fixing tape 30 is provided along the first region R1 and the second region R2 so as to straddle one end 11 of the packaging sheet 10. In this specification, the portion of the fixing tape 30 that is bonded to the first region R1 in a plan view is referred to as a root portion 31, and the portion that is bonded to the second region R2 is referred to as a front end portion 32.

[0051] By providing the fixing belt 30, when the individually packaged absorbent article 100 is opened, the user can hold the fixing belt 30 (more specifically, the front end 32 of the fixing belt 30) and pull up the first region R1, so that the opening is easier. In addition, due to the fixing belt 30, when the absorbent article is replaced, the used absorbent article can be wrapped with the packaging sheet obtained from the newly opened individually packaged absorbent article, and the end of the packaging sheet can be fixed to another position of the packaging sheet. In this way, the packaging sheet can be prevented from opening and the used absorbent article can be exposed, and the used absorbent article can be discarded hygienically.

[0052] The width (length in the short-side direction D2) of the fixing tape 30 is preferably 5 to 30 mm, more preferably 10 to 20 mm. The entire length of the fixing tape 30 is preferably 10 to 50 mm, more preferably 15 to 40 mm.

[0053] <Packaging sheet strength, sealing strength and peel strength of fixing tape, and their relationship>

[0054] The basic features of the material (material) and the like of the packaging sheet 10 used in the present embodiment are as described above. In the present embodiment, in more detail, as the packaging sheet 10, a packaging sheet with a lower strength than before is used. For example, the tensile strength of the packaging sheet 10 may be 15N / 25mm or less. The tensile strength of the packaging sheet is more preferably 13N / 25mm or less, further preferably 10N / 25mm or less, further preferably 8N / 25mm, and further preferably 5N / 25mm. Then, the upper limit of the above-mentioned tensile strength may be the tensile strength in at least the long side direction D1 of the packaging sheet 10. That is, the packaging sheet 10 may have the tensile strength in the above-mentioned range only in the long side direction D1, or may have the tensile strength in the above-mentioned range in both the long side direction D1 and the short side direction D2. By using a packaging sheet 10 having the strength in the above-mentioned range, the softness of the packaging sheet 10 can be ensured, the friction sound generated when the packaging sheet contacts is reduced, and in addition, the roughness of the packaging sheet 10 when contacted is also reduced, and the hand feel is good.

[0055] Furthermore, in order to maintain the original function as a packaging sheet, the tensile strength of the packaging sheet 10 is preferably 1N / 25mm or more, more preferably 3N / 25mm or more, and further preferably 4N / 25mm or more. The lower limit of the tensile strength may also be the lower limit of the tensile strength in at least the long side direction D1 of the packaging sheet 10. That is, the packaging sheet 10 may have the tensile strength in the above range only in the long side direction D1, or may have the tensile strength in the above range in both the long side direction D1 and the short side direction D2.

[0056] The short side direction D2 of the packaging sheet 10 (the width direction in the individually packaged absorbent article) can be the flow direction (MD direction or longitudinal direction) when the packaging sheet is manufactured, and the long side direction D1 of the packaging sheet 10 (the unsealing direction in the individually packaged absorbent article) can be the transverse direction (CD direction or transverse direction) perpendicular to the flow direction (MD direction) when the packaging sheet is manufactured.

[0057] The tensile strength of the packaging sheet can be measured by testing a test piece having a predetermined width using a tensile tester generally used in the art (eg, a tensile tester manufactured by ORIENTEC Corporation).

[0058] When the individually packaged absorbent article 100 is opened, the folded packaging sheet 10 is unfolded outwardly in the longitudinal direction D1 (for example, Figure 1(The first region R1 and the second region R2 in [it] are successively unfolded). At this time, the sealed parts of the sealing parts 15, 15 at both edge parts in the short side direction D2 are peeled off. At this time, if the sealing strength of the sealing part 15 is too large, the packaging sheet 10 may sometimes break before the sealed part is peeled off. In this regard, in the present embodiment, by making the strength of the packaging sheet and the sealing strength have a specified relationship, when the packaging sheet 10 is unfolded during the opening operation, when the sealed part is peeled off, especially when the first region R1 is peeled off from the second region R2, the packaging sheet 10 is difficult to break. More specifically, taking the tensile strength of the packaging sheet in at least the long side direction D1 as Sw (N), and the peeling strength between the packaging sheets on the sealing part as Ss (N), Ss < Sw. The tensile strength Sw of the packaging sheet 10 can consider the width of the finger held during the opening operation, and is the tensile strength per 25 mm width. The sealing strength (N) is the peeling strength when peeling the sealed part of one side of the two edge parts, and can be adjusted according to the width of the sealing part 15, the formation method of the seal, and the sealing pattern (the size, setting, etc. of the pressing part). The sealing strength, as the peeling strength between two packaging sheets, can be measured using the above-mentioned tensile testing machine. When the single-packaged absorbent article 100 is opened, the packaging sheet is applied with tensile forces not only in a fixed direction but also in various directions, and in addition, forces other than tensile forces are also applied. The tensile strength in the long side direction D1 of the packaging sheet 10 can be the following target, the strength that can avoid the breakage of the packaging sheet during opening, or the strength that can avoid the detachment of the fixing band.

[0059] Furthermore, the difference (Sw - Ss) between the tensile strength and the sealing strength of the packaging sheet is preferably 3 N or more, more preferably 3.5 N or more. Thereby, the strength of the packaging sheet is large, and the effect that the packaging sheet 10 is difficult to break during opening can be further improved.

[0060] In addition, the sealing strength Ss of one side of the sealing part 15 is preferably 0.05 N or more, more preferably 0.1 N or more. With the sealing strength Ss within the above range, accidental opening before use can be prevented.

[0061] When a fixing band 30 ( Figure 1 etc.) is provided on the single-packaged absorbent article 100, when the peeling strength of the fixing band 30 against the outer surface of the packaging sheet is St, it is preferably Ss < St. In addition, the peeling strength St of the fixing band is also the strength that can be measured using the above-mentioned tensile testing machine, and this peeling strength can be adjusted by the width of the fixing band 30 and the type of adhesive used. By making the sealing strength Ss and the peeling strength St of the fixing band have the above relationship, when the single-packaged absorbent article 100 is opened by holding the fixing band 30, that is, when the packaging sheet 10 is unfolded toward the outside in the long side direction D1 (when the first region R1 is peeled off from the second region R2), it is possible to prevent the fixing band 30 from detaching due to yielding to the sealing strength.

[0062] Further, the difference between the peel strength St and the sealing strength of the fixing band, i.e., St - Ss, is preferably 1 N or more. In addition, in view of the fact that the sealing portions 15, 15 are formed at both edge portions of the individually packaged absorbent article 100, if the peel strength St of the fixing band exceeds twice the sealing strength Ss (St > 2 × Ss), when the packaging sheet 10 is unfolded, it is preferable to more surely avoid the detachment of the fixing band 30.

[0063] In addition, when comparing the tensile strength Sw of the packaging sheet and the peel strength St of the fixing band, it is preferable that St < Sw. Thus, when lifting the first region R1 by holding the front end portion 32 at the time of opening and unfolding in the long side direction D1, or at the end or after the end of the unfolding of the first region R1, when a strong and excessive force is applied to the fixing band 30 due to elasticity or the like, the fixing band may fall off before the packaging sheet 10 breaks, and the breakage of the packaging sheet can be prevented.

[0064] Further, the difference between the tensile strength Sw of the packaging sheet and the peel strength St of the fixing band, i.e., Sw - St, is preferably 0.1 N or more, more preferably 0.125 N or more, and further preferably 1 N or more. Thereby, the following effect can be further improved, and the material of the packaging sheet 10 remaining on the fixing band 30 can be avoided. In addition, Sw - St is preferably 2 N or less, more preferably 1.5 N or less. Thereby, it can be prevented that the peel strength of the fixing band 30 is too weak and the fixing band 30 is easily detached even under a small force.

[0065] The thickness of the paper-made packaging sheet 10 (in the case of crepe paper, it is the thickness after creasing processing) is preferably 40 to 200 μm, more preferably 70 to 150 μm, and further preferably 90 to 150 μm. In addition, the basis weight of the packaging sheet 10 is preferably 12 to 50 g / m 2 and more preferably 15 to 40 g / m 2 and further preferably 15 to 35 g / m 2 . Such a thinner and / or lower basis weight packaging sheet is soft, and the sound generated during opening and carrying can be reduced. In addition, the feel is also good. Then, according to the present embodiment, by using such a thin and / or low basis weight paper-made packaging sheet, it is also possible to provide an individually packaged absorbent article having a packaging sheet 10 that is difficult to break during opening due to the specified relationship between the tensile strength Sw and the sealing strength Ss of the packaging sheet.

[0066] <Manufacture of Individually Packaged Absorbent Article>

[0067] Figure 5 A schematic diagram of an example of a manufacturing apparatus 80 for the individually packaged absorbent article 100 is given. As Figure 5 shown, the paper-made packaging sheet 10 ( Figure 1 to Figure 3) is transported in the transport direction Dt. The packaging sheet strip 10A can be obtained in a state of being rolled into a roll, and can be drawn out from such a roll for use. The packaging sheet strip 10A is transported along its long side direction, and absorbent articles 1, 1... are arranged at intervals on the inner surface of the packaging sheet strip 10A. The absorbent article 1 is arranged so that the long side direction of the absorbent article 1 is along the vertical direction Dv that is perpendicular to the transport direction Dt. Next, in the packaging part 40 of the manufacturing device 80, the packaging sheet strip 10A is folded together with the absorbent article 1 in the vertical direction Dv (i.e., the long side direction D1 of the absorbent article 1) at a folding position along the transport direction Dt. The folding is performed into three or more folds inside, and preferably, the absorbent article 1 is not exposed after folding.

[0068] The absorbent articles 1, 1, ... arranged at intervals in the conveying direction Dt are further conveyed to the seal forming portion 50 of the device 80 while being wrapped by the long packaging sheet 10A. Figure 5 As shown, the seal forming section 50 includes a pair of rollers 51, 52. In the seal forming section 50, at a position between the absorbent articles 1, 1 ... (a position where the absorbent article 1 is not provided), the long strip of packaging sheet 10A overlapping in the thickness direction is pressurized in the thickness direction by a pair of rollers 51, 52 to form a seal section 15. In the seal forming section 50, the seal sections 15, 15 of two adjacent separately packaged absorbent article portions (for example, the seal section on the right side of the separately packaged absorbent article downstream in the conveying direction and the seal section on the left side of the separately packaged absorbent article upstream in the conveying direction) are formed simultaneously.

[0069] The first roller 51 of the pair of rollers in the seal forming section 50 is provided with pressurizing sections 53, 53 ... along the circumferential direction, and similarly, the second roller 52 may be provided with pressurizing sections 54, 54 ... along the circumferential direction. Here, for example, the pressurizing sections 53, 53 ... of the first roller 51 may each be provided with a surface that is pressed against the rear surface 15a, 15a ... ( Figure 4 On the other hand, the surface of the pressing part 54, 54... of the second roller 52 can be flat. By rotating such a pair of rollers, the pressing part 53 of the first roller 51 and the pressing part 54 of the second roller 52 face each other, and the packaging sheet strip 10A sandwiched therebetween is pressurized in the thickness direction. At this time, the rollers can also be heated to heat the packaging sheet strip 10A.

[0070] After the seal portion 15 is formed in the seal forming portion 50, the packaging sheet strip 10A is cut at the center of the region in the conveying direction Dt where the seal portion is formed by the cutting portion 60, so that the individually packaged absorbent article 100 having the seal portions 15, 15 at the edge portions in the conveying direction Dt can be obtained. The seal forming portion 50 and the cutting portion 60 may be integrated, that is, the formation and cutting of the seal portion can be performed by one device.

[0071] In addition, the conveying direction Dt may be the flow direction (MD direction) when the packaging sheet strip 10A is manufactured, and the vertical direction Dv may be the lateral direction (CD direction) perpendicular to the flow direction (MD direction). Thus, the short side direction D2 of the packaging sheet 10 in the individually packaged absorbent article 100 is the MD direction, and the long side direction D1 of the packaging sheet 10 is the CD direction. However, there is no limitation as to which direction of the individually packaged absorbent article 100 the MD direction and the CD direction of the material are, and the short side direction D2 of the packaging sheet 10 in the individually packaged absorbent article 100 may be the CD direction, and the long side direction D1 of the packaging sheet 10 may be the MD direction.

[0072] [Example]

[0073] [1] Rupture test of packaging sheet when unfolded (Examples 1-1 to 1-5)

[0074] Individually packaged absorbent articles were prepared by packaging sanitary napkins (20.5 cm, with wings) with packaging sheets. The packaging sheets were made of crepe paper (90 μm thick, 18 g / m2 in weight) made mainly of hardwood pulp and softwood pulp. 2 ), with the length of the long side (opening direction) D1 being 240 mm x the length of the short side (width direction) D2 being 120 mm. More specifically, the individually packaged absorbent article is placed in the following direction so that the long side of the sanitary napkin is along the long side of the packaging sheet, and the packaging sheet and the sanitary napkin are folded together as follows: Figure 1 to Figure 3 The inner three-fold shown in the figure has two edges in the short side direction of the packaging sheet sealed. The sealed portion formed by sealing is formed by Figure 5 The sealing forming portion 50 is pressed by a pair of rollers, such as Figure 1 and Figure 4 The sealing portion with a width of 6 mm is formed by multiple laminations shown. A plurality of dot-shaped protrusions corresponding to the laminations are formed on the surface of one of the pair of rollers, and the surface of the other is flat. In any case, lamination is performed under the conditions of a roller temperature (set value) of 152°C and a line speed of 1050 sheets / minute. However, the sealing strength obtained in each case is different. Furthermore, a fixing tape ( Figure 1 and Figure 3 The fixing tape has a width of 12 mm and a peel strength of 3.47 N / 12 mm for the packaging sheet, which is sufficient for the sealing strength of the sealing portion.

[0075] The individually packaged absorbent articles of each example were evaluated from the viewpoint of the rupture of the packaging sheet when unfolded. In addition, the tensile strength (N) in the long side direction of the packaging sheet used was measured. Furthermore, the sealing strength (N) of the sealing portion in each example was also measured. In addition, the sealing strength (N) of the sealing portion was prepared by preparing another individually packaged absorbent article made in the same manner as the individually packaged absorbent article of the measured example, and evaluating the sealing portion of the other individually packaged absorbent article.

[0076] The evaluation and measurement methods are as follows. The results are shown in Table 1.

[0077] <Evaluation of rupture of packaging sheet (Evaluation of rupture of packaging sheet when first area is unfolded)>

[0078] The individually packaged absorbent articles of each example were unfolded in the longitudinal direction (by holding the fixing tape) using a conventional method. Figure 1 and Figure 3 At this time, when the seals of the two edges in the short side direction are peeled off, observe whether there is any crack in the packaging sheet. If there is no crack in the packaging sheet, it is marked as "0", if there is a slight crack in the packaging sheet (less than 5 mm), it is marked as "△", and if there is a large crack in the packaging sheet (more than 5 mm), it is marked as "×".

[0079] In the evaluation of the unsealing properties of Examples 1-1 to 1-5, when the fixing tape began to peel off (when the fixing tape was removed from the second region R2 ( Figure 1 ) When peeling, the packaging sheet is not broken and the fixing tape is not detached.

[0080] <Tensile Strength Sw of Packaging Sheet>

[0081] The tensile strength in the long direction of the packaging sheet (the direction of opening in the individually packaged absorbent article) is measured. From the packaging sheet, a portion of the packaging sheet having the long direction of the packaging sheet (the direction of opening in the individually packaged absorbent article) is cut out.

[0082] A rectangular test piece of 120 mm × 25 mm in the short side direction of the packaging sheet (width direction in the individually packaged absorbent article) was subjected to a tensile test using a tensile tester (TENSILON tester "RTC-1210A" manufactured by ORIENTEC Corporation) at a clamp interval of 50 mm and a tensile speed of 500 mm / min to measure the tensile strength and tensile elongation. The tensile strength (N) of the packaging sheet is the average value of the measured values ​​based on 6 measurements.

[0083] <Seal Strength Ss>

[0084] Cut the edge part in the short side direction of the individually packaged absorbent article at a position 25 mm from the end edge in the short side direction, and conduct a test using the above-mentioned tensile testing machine. Specifically, slightly peel the end edge in the long side direction ( Figure 1 one end 11 in the long side direction contained in the first region R1 in Figure 1 and install one clamp. Install another clamp near the end edge in the long side direction of the individually packaged absorbent article ( Figure 1 crease line F2 in

[0085]

Table 1

[0086]

[0087] As shown in Table 1, in Examples 1-1 to 1-5, comparing the sealing strength Ss and the tensile strength Sw of the packaging sheet, Ss < Sw is satisfied. Therefore, it can be known that in the individually packaged absorbent article satisfying such a relationship, the packaging sheet is difficult to break. Further, it can be known that when the difference between the sealing strength Ss and the tensile strength Sw of the packaging sheet is 3 N or more (Examples 1-1 to 1-3), it is particularly difficult to cause breakage.

[0088] [2] Peel test of the fixing band (Examples 2-1 to 2-7)

[0089] Similar to Examples 1-1 to 1-5, prepare individually packaged absorbent articles based on Examples 2-1 to 2-7. In any of Examples 2-1 to 2-7, for convenience, the strength of the sealed portion is the same sealing strength (0.25 N). In addition, in each example, the type of the fixing band is changed to make the adhesive strength of the fixing band different.

[0090] Measure the peel strength (adhesive strength) (N) of the fixing band used in each example. In addition, when measuring, the material adhesion of the packaging sheet on the fixing band side is also evaluated. The present inventors believe that the evaluation of the material adhesion of the packaging sheet to the fixing band is one of the criteria for the ease and difficulty of breaking of the packaging sheet during opening. The evaluation and measurement are carried out as follows. The results are shown in Table 2.

[0091] <Peel strength of the fixing band>

[0092] Cut out the portion where the fixing band is attached from the individually packaged absorbent article. Specifically, peel the packaging sheet from the front end portion of the fixing band ( Figure 1 such as the portion with symbol 32 in Figure 1After the symbol 31 in etc. is adhered, the packaging sheet is directly cut into a packaging sheet piece 10a with a short side direction (D2) of 100 mm and a long side direction (D1) of 20 mm, and this is used as a test piece. Then, as Figure 6 shown, the end in the short side direction D2 is folded and adhered to the backing paper B so that the packaging sheet piece 10a and the backing paper B form a loop. The area where the packaging sheet piece 10a and the backing paper B are adhered is shown by diagonal lines in Figure 6 . Then, one jig holds the backing paper B, and the other jig holds the front end of the fixing band 30, and they are pulled in opposite directions. This peel strength test uses a tensile testing machine (manufactured by ORIENTEC Co., Ltd., "TENSILON testing machine" RTC1210"), with a jig interval of 20 mm and a tensile speed of 300 mm / minute.

[0093] <Evaluation of the adhesion of the packaging sheet material on the fixing band)>

[0094] In the above-mentioned peel test, observe the adhesion residue of the material on the packaging sheet on the fixing band when the fixing band is peeled. When the area of the material residue of the packaging sheet is less than 0 - 30% of the area of the fixing band, it is "〇"; when it is 30% or more and less than 80%, it is "△"; when it exceeds 80%, it is "×". In the case of "△", there is adhesion of the material on the fixing band, and as the quality related to the opening of the individually packaged absorbent article, it is also sufficient. When wrapping the used absorbent article with the packaging sheet during the replacement of the absorbent article, the fixing band can be reused.

[0095]

Table 2

[0096]

[0097] In Table 2, when comparing the peel strength St (N) of the fixing band with a width of 12 mm and the tensile strength (N) of the packaging sheet with a width of 25 mm, it can be seen that in the cases where St < Sw (Example 2 - 6 and Example 2 - 7), the adhesion of the packaging sheet material on the fixing band is significant. In addition, it can be seen that in the examples that satisfy St < Sw, especially when Sw - St is 0.1 N or more (Example 2 - 1 to Example 2 - 4), the adhesion of the packaging sheet material on the fixing band is difficult to occur.

[0098] [3] Detachment test of the fixing band (Example 3 - 1 and Example 3 - 2)

[0099] By changing the peel strength St and the sealing strength Ss of the fixing band, this test is carried out to observe the detachment of the fixing band. Similar to Example 1 - 1 to Example 1 - 5 and Example 2 - 1 to Example 2 - 7, prepare individually packaged absorbent articles based on Example 3 - 1 and Example 3 - 2. Here, in Example 3 - 1 and Example 3 - 2, the sealing strength is the same, but the types of the fixing bands in each example are changed, and the bonding strength of the fixing bands is different.

[0100] The individually packaged absorbent articles of each example were evaluated from the viewpoint of the ease of detachment of the fixing tape. The results are shown in Table 3.

[0101] <Evaluation of Detachment of Fixing Tape>

[0102] The individually packaged absorbent articles of each example were unfolded in the long side direction by the usual method, specifically, holding the fixing tape (unfolding the first region R1 in Figure 1 and Figure 3 completely). At this time, when the fixing tape does not detach and no peeling occurs at all, it is marked as "〇"; when the fixing tape does not detach but partial peeling occurs, it is marked as "△"; when the fixing tape detaches, it is marked as "×".

[0103]

Table 3

[0104]

[0105] As shown in Table 3, both Example 3-1 and Example 3-2 satisfy Ss < St. Among these, when St - Ss is 1 N or more (Example 3-2), it is difficult for the fixing tape to peel off when the packaging sheet is unfolded.

[0106] As described above, the present invention has been described based on the embodiments, but the present invention is not limited to these embodiments. The above embodiments can be variously changed, modified, replaced, added, deleted, combined, etc. within the scope recited in the patent claims, and these also belong to the technical scope of the present invention. In addition, the above structural elements can be arbitrarily combined.

[0107] Furthermore, the specific embodiments of the present invention are described below.

[0108] (Supplementary Note 1)

[0109] The embodiment related to Supplementary Note 1 is an individually packaged absorbent article in which the absorbent article is individually packaged by a paper packaging sheet. The packaging sheet, together with the absorbent article provided on the inner surface of the packaging sheet, is folded to the inner surface side in the long side direction of the packaging sheet, and both edge portions in the short side direction perpendicular to the long side direction are sealed to form a sealing portion. The tensile strength of at least the long side direction of the packaging sheet is 15 N / 25 mm or less. Let the peeling strength between the packaging sheets on the sealing portion be Ss, and the tensile strength of the packaging sheet be Sw, and Ss < Sw.

[0110] According to the method described in the above-mentioned supplementary note 1, the packaging sheet has a smaller specified tensile strength. Therefore, the softness of the packaging sheet is improved, and the friction sound generated when the packaging sheet is touched can be reduced. In addition, the roughness of the packaging sheet when touched is also reduced, and the hand feel is good. In addition, even if an individually packaged absorbent article is formed using such a packaging sheet with a smaller tensile strength, through this method, by making the sealing strength of the sealed portion in the individually packaged absorbent article and the tensile strength of the packaging sheet have a specified relationship, the packaging sheet is difficult to break when the sealed portion is peeled off during unsealing.

[0111] (Note 2)

[0112] In the embodiment of Supplementary Note 2, the exposed end of the packaging sheet in the longitudinal direction is fixed by a fixing tape, and the peel strength between the fixing tape and the packaging sheet is St, Ss. <St。

[0113] According to the method related to the above-mentioned supplementary note 2, the fixing tape is provided, and it is easy to hold the end of the packaging sheet when opening, so that the opening is easy. In addition, there is the following advantage: the fixing tape can also be used to fix the packaging sheet after wrapping the used absorbent article when the used absorbent article is discarded. Then, even if the structure with the fixing tape is provided, according to this method, the sealing strength of the sealing part and the peeling strength of the fixing tape are in a specified relationship, and when the sealed part of the sealing part is peeled off, the worry of the fixing tape being detached can be eliminated.

[0114] (Note 3)

[0115] In the method mentioned in Appendix 3, St <Sw。

[0116] According to the method involved in the above-mentioned Note 3, when opening, the front end portion (one end in the long side direction) of the packaging sheet is held, and when the packaging sheet (the area arranged on the outside) is unfolded in the long side direction D1, or when the packaging sheet is finished or after being unfolded, due to the elasticity and the like, a sudden and excessive force is applied to the fixing belt, and the fixing belt may also fall off before the packaging sheet breaks, thereby preventing the packaging sheet from breaking.

[0117] (Note 4)

[0118] In the embodiment according to Supplementary Note 4, the packaging sheet has a thickness of 40 to 200 μm.

[0119] By using a relatively thin packaging sheet, the softness of the packaging sheet can be ensured, and the friction noise when the packaging sheet is touched can be reduced and the hand feel can be improved. In addition, even with such a thin packaging sheet, according to this method, the sealing strength of the sealed portion in the individually packaged absorbent article and the tensile strength of the packaging sheet are in a specified relationship, and the packaging sheet is difficult to break when the sealed portion is peeled off during unpacking.

[0120] (Note 5)

[0121] In the method related to Appendix 5, a paper packaging sheet for individually packaging an absorbent article, together with the absorbent article arranged on the inner surface of the packaging sheet, constitutes the following individually packaged absorbent article, wherein the packaging sheet is folded to the inner surface side in the long side direction, and the two edge portions in the short side direction perpendicular to the long side direction are sealed to form a sealed portion, wherein the peel strength of the packaging sheets on the sealed portion is Ss, and the tensile strength of the packaging sheets is Sw, Ss <Sw。

[0122] According to the embodiment of Supplementary Note 5, a packaging sheet having the same effects as those of the embodiment of Supplementary Note 1 can be obtained.

[0123] This application claims priority based on Japanese Patent Application No. 2022-185095 filed on November 18, 2022, the entire contents of which are incorporated herein by reference.

[0124] [Reference Signs]

[0125] 1. Absorbent articles

[0126] 3 Top sheet

[0127] 4 Absorber

[0128] 7 Side sheets

[0129] 10 Packaging Sheet

[0130] 11 One end of the long side

[0131] 12 The other end of the long side

[0132] 15 Sealing part

[0133] 15a Pressing part

[0134] 30 Fixing strap

[0135] 31 Root

[0136] 32 front end

[0137] 40 Packaging Department

[0138] 50 seal forming portion

[0139] 60 Cutting section

[0140] 80 Individually packaged absorbent article manufacturing device

[0141] 100 individually wrapped absorbent articles

[0142] D1 Long side direction of packaging sheet (opening direction)

[0143] D2 Short side direction of packaging sheet (width direction)

[0144] F1 1st fold line

[0145] F2 2nd fold line

[0146] R1 Area 1

[0147] R2 Area 2

[0148] R3 Area 3

Claims

1. An individually packaged absorbent article, wherein: The absorbent articles are individually packaged with paper packaging sheets. The packaging sheet and the absorbent article disposed on the inner surface of the packaging sheet are folded to the inner surface side in the long side direction of the packaging sheet, and the two edge portions in the short side direction perpendicular to the long side direction are sealed to form a sealed portion. The tensile strength of at least the long side direction of the packaging sheet is 15 N / 25 mm or less, the peel strength between the packaging sheets at the sealing portion is Ss, the tensile strength of the packaging sheet is Sw, and Ss <Sw。 2. The individually packaged absorbent article according to claim 1, wherein the exposed end portion in the longitudinal direction of the packaging sheet is fixed by a fixing tape, The peel strength between the fixing tape and the packaging sheet is St, Ss <St。 3. The individually packaged absorbent article according to claim 2, wherein <Sw。 4. The individually packaged absorbent article according to claim 1 or 2, wherein the packaging sheet has a thickness of 40 to 200 μm.

5. A packaging sheet, which is a paper packaging sheet used to individually package absorbent articles. Together with the absorbent article disposed on the inner surface of the packaging sheet, the individually packaged absorbent article is constituted as follows: the packaging sheet is folded to the inner surface side in the long side direction, and the two edge portions in the short side direction perpendicular to the long side direction are sealed to form a sealed portion, The peel strength of the packaging sheets at the sealing portion is Ss, the tensile strength of the packaging sheets is Sw, and Ss <Sw。

Images