CN109069321A

CN109069321A - Absorbent commodity non-woven fabrics, absorbent commodity top-sheet and the absorbent commodity comprising it

Info

Publication number: CN109069321A
Application number: CN201780020203.9A
Authority: CN
Inventors: 中村保纪; 五百藏悦圣
Original assignee: Daiwabo Holdings Co Ltd; Daiwabo Polytec Co Ltd
Current assignee: Daiwabo Holdings Co Ltd; Daiwabo Polytec Co Ltd
Priority date: 2016-03-31
Filing date: 2017-03-31
Publication date: 2018-12-21
Also published as: JP2022136194A; JPWO2017171017A1; JP7433583B2; WO2017171017A1; JP2024026636A; KR20180131582A

Abstract

The present invention provides a kind of non-woven fabrics, it is the non-woven fabrics of at least two-layer structure with the first fibrous layer and the second fibrous layer, first fibrous layer and the second fibrous layer both of which respectively have specific fiber number, the fibre diameter of first fibrous layer is greater than the fibre diameter of the second fibrous layer, first fibrous layer and the second fibrous layer both of which have the hydrophily that hydrophilic height can also be maintained even if with water contact, the first fibrous layer and the second fibrous layer both of which hydrophily having the same.At least one kind of in quality, rewetting amount, rate of liquid aspiration, diffusion length, (rewetting amount, rate of liquid aspiration and diffusion length) repeatedly durability, keeping quality etc. of the non-woven fabrics is improved, and absorbent commodity can be suitably employed in.

Description

Absorbent commodity non-woven fabrics, absorbent commodity top-sheet and comprising its Absorbent commodity

Technical field

The present invention relates to non-woven fabrics, absorbent commodity sheet material and include its absorbent commodity.More specifically, Be related to non-woven fabrics used in absorbent commodity, comprising its absorbent commodity top-sheet and comprising its absorbability Article.

Background technique

As the top-sheet of the absorbent commodities such as disposable diaper, sanitary napkin, incontinence pad and panty liner, mention A kind of non-woven fabrics with two-layer structure is gone out.For example, patent document 1 proposes a kind of absorbent commodity top-sheet, It is formed by non-woven fabrics, the non-woven fabrics is with the first fibrous layer and adjacent thereto second contacted with the skin of user The fiber of the non-woven fabrics of the two-layer structure of fibrous layer, the first fibrous layer has smaller specific fibre diameter (11~18 μm), The fiber of second fibrous layer has bigger specific fibre diameter (19~31 μm), the base of the first fibrous layer and the second fibrous layer It is again particular value (7~30g/m²).Patent document 1 describes: can make top-sheet because non-woven fabrics has this feature Fine texture, and can reduce rewetting amount.

In turn, patent document 1 describes: the fiber of the first fibrous layer and the second fibrous layer has carried out hydrophiling, for The reasons why rewetting amount can be made to further decrease, preferably according to the fiber of the first fibrous layer compared with the fiber of the second fibrous layer The mode that hydrophiling degree is easier to reduce due to the contact with water has carried out hydrophiling.

In addition, patent document 2 proposes a kind of surficial sheets of absorbent commodity, which is characterized in that it is by having configuration It is formed on the upper layer of skin side and configuration in the stacking non-woven fabrics for the lower layer for absorbing side, before penetration by liquid, compared with upper layer The water-wetness of lower layer is higher or roughly equal, after penetration by liquid, as hydrophilic finish used in upper layer, selects its water resistance Considerably higher hydrophilic finish compared with the water resistance of the hydrophilic finish used in the lower layer, the as a result, above-mentioned upper layer compared with lower layer Water-wetness obviously get higher.Patent document 2 describes: according to the surficial sheets of the absorbent commodity, liquid permeability is being used It is maintained when absorbent commodity with stable state, the surface of the liquid such as urine, menses can be prevented for a long time in use Flowing and rewetting.

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2004-166832 bulletin

Patent document 2: Japanese Unexamined Patent Publication 2005-324010 bulletin

Summary of the invention

Problems to be solved by the invention

For absorbent commodity, other than requiring quality and rewetting amount, rate of liquid aspiration, diffusion length, (rewetting Amount, rate of liquid aspiration and diffusion length) repeatedly the properties such as durability, keeping quality, cost also require to improve.In turn, diaper etc. is not no It can be replaced immediately once wet, therefore, it is extremely important for coping with excretion (i.e. durability repeatedly) repeatedly.

Patent document 1 describes: hydrophiling is carried out to the non-woven fabrics of two-layer structure, and if preferably the first fibrous layer fibre Dimension is contacted with water, and hydrophiling degree is easy to happen reduction.But patent document 1 in embodiment for hydrophiling degree and its Water resistance does not have any specific record, in addition, for the property except quality and rewetting amount without any disclosure yet.

In addition, the non-woven fabrics and surficial sheets recorded in patent document 1 and patent document 2 are characterized in that, it is being configured at The fibrous layer and structure in the face (also commonly referred to as skin contact layer) that skin side, composition are contacted with the skin of wearer when in use At above-mentioned skin contact layer opposite side surfaces and do not contact the skin of wearer when in use and constitute opposite with absorber In the fibrous layer on surface, hydrophily intensity (hydrophiling degree) for liquid and contacting hydrophilic intensity with liquid it is difficult It is in other words, different in upper and lower fibrous layer for the durability of hydrophilic liquid to reduce.

In order to obtain such non-woven fabrics, surficial sheets, for constituting the synthetic fibers of these fibrous layers, make to consider pair Durability when intensity (such as hydrophily), the contact liq of the compatibility of liquid (is difficult to contacting with liquid from fibre Fall off in dimension) hydrophilic agent (also referred to as fibre finish) be attached to fiber surface, manufacture non-woven fabrics on this basis.

But in the case where manufacturing the non-woven fabrics of two-layer structure, non-woven fabrics is manufactured in the form being rolled into a roll, is protected Pipe, shipment, the different fiber of property is taken care of in the state of closely sealed each other at this time.The state being rolled into a roll is being kept for a long time In the case where, if keeping environment is the environment of high temperature and humidity, the hydrophilic agent fiber different in used fibre finish The part that layer is in contact with each other is mutually shifted, when absorbent commodity is made, it is possible to can not play designed performance.

The method for solving problem

The inventors of the present invention surprisingly it has been found that: the non-woven fabrics of at least two-layer structure with the first fibrous layer and the second fibrous layer In, the first fibrous layer and the second fibrous layer both of which respectively have specific fiber number, and the fibre diameter of the first fibrous layer is less than The fibre diameter of second fibrous layer, both the first fibrous layer and the second fibrous layer can maintain hydrophily contacting with water Height, the first fibrous layer and the second fibrous layer both of which implement substantially the same hydrophily etc., thus selected from quality, Rewetting amount, imbibition time, diffusion length, (rewetting amount, imbibition time and diffusion length) are repeatedly in durability, keeping quality etc. It is at least one kind of to be improved, and it was found that: it is more preferably selected from the durability repeatedly of rewetting amount, imbibition time and diffusion length It is at least one kind of to be improved, so as to complete the present invention.

That is, a kind of absorbent commodity non-woven fabrics is provided in a purport of the invention,

It is the non-woven fabrics with the first fibrous layer and second fibrous layer adjacent with first fibrous layer,

The fiber number for forming the fiber of the first fibrous layer is 1.0~2.8dtex,

The fiber number for forming the fiber of the second fibrous layer is 1.7~5.6dtex,

The fibre diameter for forming the fiber of the first fibrous layer is less than the fibre diameter for forming the fiber of the second fibrous layer,

Formed the first fibrous layer fiber and formed the second fibrous layer fiber both of which implement even if the fiber with Water contact can also maintain the hydrophilicity-imparting treatment of its hydrophilic height (hydrophiling degree) (that is, the hydrophiling degree of fiber is with water-fast Property), hydrophily (hydrophilic height and its water resistance) is substantially the same,

Non-woven fabrics is configured in such a way that the first fibrous layer is towards the skin of people.

What nonwoven surface and the compatibility of water can be formed between the fiber surface and water droplet for constituting non-woven fabrics connects The size of feeler indicates.That is, it can be said that: the compatibility (hydrophily) of the smaller then non-woven fabrics of contact angle and liquid is higher, contact The more big then compatibility (hydrophily) in angle is lower.In addition, can be with before and after making penetration by liquid for the durability of hydrophilic liquid The variation of contact angle indicates.

Thus, the present invention provides a kind of absorbent commodity non-woven fabrics in other purports,

The ion exchange water contact angle (A1) on the surface of the fiber relative to the first fibrous layer of formation before being contacted with water and The ion exchange water contact angle (A2) on the surface of the fiber relative to the second fibrous layer of formation before contacting with water meets following (I):

(I): A1≤80 °, A2≤≤ 80 °, | A1-A2 | < 12

The ion exchange water contact angle (B1) on the surface of the fiber relative to the first fibrous layer of formation after being contacted with water and The ion exchange water contact angle (B2) on the surface of the fiber relative to the second fibrous layer of formation after contacting with water meets following (II):

(II): -5≤(B1-A1) 40 ° of <, -5≤(B2-A2) 40 ° of <

The effect of invention

The application has feature as described above, therefore, is selected from quality, rewetting amount, imbibition time, diffusion length, (rewetting Amount, imbibition time and diffusion length) repeatedly at least one kind of in durability, keeping quality etc. improved.It is more preferably selected from rewetting Amount, imbibition time and diffusion length durability repeatedly at least one kind of improved.

Detailed description of the invention

Fig. 1 schematically shows contact angle formed by water droplet and fiber (surface).

Fig. 2 has been shown schematically as the contact angle after measurement water penetrates and has been used to that water droplet to be made to be attached to nonwoven sample Stainless steel panel.

Specific embodiment

The present invention provides a kind of absorbent commodity non-woven fabrics.

Absorbent commodity generally comprises the absorber of liquid retainability, the back-sheet of liquid impermeability and penetration by liquid The top-sheet of property, configures back-sheet between absorber and top-sheet.Absorbability described in embodiments of the present invention The top-sheet that article uses non-woven fabrics to contact as the skin with wearer configures.As the back-sheet and absorption Substance usually used in absorbent commodity can be used in body.

For example, the film of the thermoplastic resin with penetrability or without penetrability can be used as back-sheet.Example Such as, it as absorber, can be used paper pulp fiber, the particle of superabsorbent polymer or their mixture toilet paper etc. Absorber made of the package such as paper or clamping.

The absorbent commodity of mode of the invention with non-woven fabrics be with the first fibrous layer and with the first fibrous layer phase At least two layers of non-woven fabrics of the second adjacent fibrous layer,

Even if formed the first fibrous layer fiber and formed the second fibrous layer fiber both of which have these fibers with Water contact can also maintain the hydrophily of their hydrophilic height, and their hydrophily is identical,

In such a way that the first fibrous layer is towards the skin of people, i.e. towards configuring nonwoven in the way of the outside of absorbent commodity Cloth.

The absorbent commodity non-woven fabrics of the mode of aforementioned present invention can also be by using the contact angle of fiber surface and water And the fiber surface for recording composition non-woven fabrics as follows is i.e. hydrophilic strong for the dip dyeing easness of the liquid comprising water Degree and the property being difficult to decrease contacting its hydrophily with such liquid.

The absorbent commodity of mode of the invention with non-woven fabrics be with the first fibrous layer and with the first fibrous layer phase The non-woven fabrics of the second adjacent fibrous layer,

(I): A1≤80 °, A2≤80 °, | A1-A2 | < 12

(II): -5≤(B1-A1) 40 ° of <, -5≤(B2-A2) 40 ° of <

Form the fiber number of the fiber of the first fibrous layer for 1.0~2.8dtex, preferably 1.5~2.6dtex, more preferably 1.7~2.3dtex.

Form the fiber number of the fiber of the second fibrous layer for 1.7~5.6dtex, preferably 2.0~5.0dtex, more preferably 2.6~4.0dtex.

In turn, the fibre diameter for forming the fiber of the first fibrous layer is straight less than the fiber for the fiber for forming the second fibrous layer Diameter.

Therefore, in the present invention, the thinner fiber of the first fibrous layer use of the skin towards people, second towards absorber Fibrous layer uses the fiber thicker than the first fibrous layer.

The fiber of first fibrous layer of the skin towards people has the specific fiber number thinner than the fiber of the second fibrous layer, because This quality, sense of touch improve, so it is preferred that.

It should be noted that the fiber that the first fibrous layer and the second fibrous layer are preferably formed as them all has above range Fibre number may include the fiber outside above range but in the range of not damaging desired effects of the invention.

The fibre diameter for forming the fiber of the first fibrous layer is preferably 10~20 μm, and more preferably 12~19 μm, further Preferably 14~18 μm.

The fibre diameter for forming the fiber of the second fibrous layer is preferably 13~28 μm, and more preferably 15~26 μm, further Preferably 17~24 μm, be still more preferably 17~21 μm.

As long as the non-woven fabrics of target of the present invention can be obtained, the fiber (raw material or material) of the first fibrous layer is without special It limits.

The fiber of first fibrous layer may include such as following fibers: natural fiber cotton, silk and wool；Viscose glue people Make silk, copper ammonia fiber and solvent spinning fibre cellulose fiber (such as Lenzing Lyocell (registered trademark) and Tensel (registration Trade mark)) etc. regenerated fibers；Polyolefin series fiber, polyester fiber, perlon, (poly-) propylene formed by acrylonitrile The synthesis such as sour series fiber, polycarbonate series fiber, polyacetals series fiber, polystyrene series fiber and cyclic polyolefin series fiber is fine Dimension.

The fiber formed by the resin of single kind not only can be used in the fiber of first fibrous layer, also can be used by two Kind or more resin formed composite fibre (such as concentric or eccentric sheath-core type conjugate fiber, islands-in-sea bicomponent fibre, side by side Type composite fibre).

It should be noted that when comprising natural fiber, it, can be according to JIS L 1019 for its fiber number or fibre diameter 7.4.1 the method based on Micronaire (Micronaire) is calculated.

As the fiber of the first fibrous layer, preferably synthetic fiber, more preferably polyester fiber, polyolefin series fiber and A combination thereof.About the fiber of the first fibrous layer, as long as the non-woven fabrics of target of the present invention can be obtained, synthetic fibers be may include Regenerated fiber and/or natural fiber.

The fiber of first fibrous layer may include the polyester fiber such as polyethylene terephthalate；And poly- second Alkene (high density polyethylene (HDPE), low density polyethylene (LDPE), straight-chain low density polyethylene (LDPE)), polypropylene, ethylene-propylene copolymer, ethylene- The polyolefin series fibers such as butene-1-propylene terpolymers；And the fiber for being composed them.

It is crispaturaed due to can easily assign, polyethylene is more preferably high density polyethylene (HDPE).In the application, As described later, fibre finish can be used in order to bestow hydrophily to fiber.It can easily crispatura to fiber imparting In the case where, containing for example can reduce for bestowing the necessity of hydrophobic additional ingredient in fibre finish, can press down Make the unnecessary influence caused by imbibition characteristic.

These fibers may be used singly or in combin.

When two kinds of fibers are combined, by fiber obtained by various fiber simple mixings, concentric or eccentric core-sheath-type Composite fibre etc., the form combined, are not particularly limited as long as the non-woven fabrics that can obtain target.

It is preferred that the first fibrous layer can be thinned in the composite fibre of concentric or eccentric core-sheath-type, concentric sheath-core type conjugate fiber Thickness, so more preferably.

When the thickness of non-woven fabrics is thin, the distance until absorber shortens, and therefore, liquid mobility is good, the imbibition time, Rewetting amount can further increase, and therefore, the thickness of the first fibrous layer is it is also preferred that relatively thin.

The compound fibre for the concentric or eccentric core-sheath-type being still more preferably made of polyester based resin and polyolefin-based resins Dimension.Particularly preferred core component is the composite fibre of polyester based resin, the core-sheath-type that sheath ingredient is polyolefin-based resins.

The fiber of first fibrous layer preferably comprises the concentric sheath-core type conjugate fiber of 50 mass % or more, more preferably includes 70 Quality % or more, the whole fibers for being especially preferred to form the first fibrous layer are concentric sheath-core type conjugate fiber.First fibrous layer Fiber include 50 mass % or more concentric sheath-core type conjugate fiber when, the increasing of the thickness of non-woven fabrics can be further suppressed Add.

It, can be in the fibre comprising the addition such as titanium oxide in order to improve quality, sense of touch about the fiber of the first fibrous layer Agent.Using further include additive etc. fiber integrally as 100 mass %, preferably comprise this additive of 0.1~10 mass %, It more preferably include 1~5 mass %.In addition, the fiber of the first fibrous layer be sheath-core type conjugate fiber when, additive preferably core at Point in comprising more, be preferably only contained in core component.When additive is contained in sheath ingredient, the manufacturing device of non-woven fabrics etc. is sometimes It can be damaged.

In the case where sheath-core type conjugate fiber, the compound ratio of core component and sheath ingredient is preferably 80: 20 by quality ratio ~40: 60,70: 30~50: 50, further preferably 65: 35~55: 45 are more preferably.When compound ratio is the range, especially By it is compound than (mass ratio) in terms of core component it is more when, the weight per unit area of non-woven fabrics, the unevenness of substrate can tail off, so excellent Choosing.

As long as the non-woven fabrics of target of the present invention can be obtained, the fiber (raw material or material) of the second fibrous layer is without special It limits.

The fiber of second fibrous layer may include such as following fibers: natural fiber cotton, silk and wool；Viscose glue people Make silk, copper ammonia fiber and solvent spinning fibre cellulose fiber (such as Lenzing Lyocell (registered trademark) and Tensel (registration Trade mark)) etc. regenerated fibers；Polyolefin series fiber, polyester fiber, perlon, (poly-) propylene formed by acrylonitrile The synthesis such as sour series fiber, polycarbonate series fiber, polyacetals series fiber, polystyrene series fiber and cyclic polyolefin series fiber is fine Dimension.

The fiber formed by the resin of single kind not only can be used in the fiber of second fibrous layer, also can be used by two Kind or more resin formed composite fibre (such as concentric or eccentric sheath-core type conjugate fiber, islands-in-sea bicomponent fibre, side by side Type composite fibre).

It should be noted that when comprising natural fiber, it, can be according to JIS L 1019 for its fiber number or fibre diameter 7.4.1 the method based on Micronaire is calculated.

As the fiber of the second fibrous layer, preferably synthetic fiber, more preferably polyester fiber, polyolefin series fiber and A combination thereof.About the fiber of the second fibrous layer, as long as the non-woven fabrics of target of the present invention can be obtained, synthetic fibers be may include Regenerated fiber and/or natural fiber.

The fiber of second fibrous layer may include the polyester fiber such as polyethylene terephthalate；And poly- second Alkene (high density polyethylene (HDPE), low density polyethylene (LDPE), straight-chain low density polyethylene (LDPE)), polypropylene, ethylene-propylene copolymer, ethylene- The polyolefin series fibers such as butene-1-propylene terpolymers；And the fiber for being composed them.

These fibers may be used singly or in combin.

When two kinds of fibers are combined, about by fiber obtained by various fiber simple mixings, concentric or eccentric core sheath Composite fibre of type etc., the form combined, are not particularly limited as long as the non-woven fabrics that can obtain target.

The second fibrous layer can be thinned in the composite fibre of preferably concentric or eccentric core-sheath-type, concentric sheath-core type conjugate fiber Thickness, so more preferably.

When the thickness of non-woven fabrics is thin, the distance until absorber shortens, and therefore, liquid mobility is good, the imbibition time, Rewetting amount can further increase, and therefore, the thickness of the second fibrous layer is it is also preferred that relatively thin.

The fiber of second fibrous layer preferably comprises the concentric sheath-core type conjugate fiber of 50 mass % or more, more preferably includes 70 Quality % or more, the whole fibers for being especially preferred to form the second fibrous layer are concentric sheath-core type conjugate fiber.Second fibrous layer Fiber include 50 mass % or more concentric sheath-core type conjugate fiber when, the increasing of the thickness of non-woven fabrics can be further suppressed Add.It, can be in the fibre comprising additives such as titanium oxide in order to improve quality, sense of touch about the fiber of the second fibrous layer.With packet The fiber of additive containing the second fibrous layer etc. is integrally used as 100 mass %, preferably comprises this addition of 0.1~10 mass % Agent more preferably includes 1~5 mass %.In addition, additive preferably exists when the fiber of the second fibrous layer is sheath-core type conjugate fiber In core component comprising more, be preferably only contained in core component.When additive is contained in sheath ingredient, the manufacturing device of non-woven fabrics etc. It is damaged sometimes.

In the case where sheath-core type conjugate fiber, the compound ratio of core component and sheath ingredient is preferably 80: 20 by quality ratio ~40: 60,70: 30~50: 50, further preferably 65: 35~55: 45 are more preferably.When compound ratio is the range, especially By it is compound than (mass ratio) in terms of core component it is more when, the weight per unit area of non-woven fabrics and the unevenness of substrate tail off, so more excellent Choosing.

In turn, the weight per unit area of non-woven fabrics entirety is preferably 10~80g/m², more preferably 15~50g/m², into one Step is preferably 17~40g/m²。

It is as low as possible from the weight per unit area of cost aspect, non-woven fabrics entirety in the case where disposable diaper When it is preferable, weight per unit area at this time is preferably 10~50g/m², more preferably 15~40g/m²。

In addition, the thickness of non-woven fabrics is preferably 0.2~3.0mm, more preferably 0.3~1.5mm, further preferably 0.35 ~0.8mm.It is preferable when the thickness of non-woven fabrics is as low as possible from cost aspect in the case where disposable diaper, at this time Thickness is preferably 0.2~1.0mm, more preferably 0.3~0.8mm.

The weight per unit area of first fibrous layer is preferably 3~40g/m², more preferably 5~15g/m²。

The weight per unit area of second fibrous layer is preferably 3~40g/m², more preferably 8~20g/m²。

The ratio between weight per unit area of the weight per unit area of second fibrous layer and the first fibrous layer (list of the second fibrous layer Position area weight/first fibrous layer weight per unit area) it is preferably 0.8~3.0, is more preferably 1.0~2.0, is further excellent It is selected as 1.3~1.7.Especially unit of the weight per unit area of smaller first fibrous layer of fibre diameter less than the second fibrous layer When area weight, i.e. the ratio between weight per unit area of the weight per unit area of the second fibrous layer and the first fibrous layer (the second fiber Layer weight per unit area/first fibrous layer weight per unit area) be greater than 1 in the case where, while with quality, sense of touch More good imbibition characteristic can be obtained, so more preferably.

The fiber for forming the first fibrous layer and the fiber both of which for forming the second fibrous layer are carried out and contact even if with water It can also maintain the hydrophily (that is, fiber has the hydrophily with water resistance) of hydrophilic height (hydrophiling degree).

About " hydrophily of hydrophilic height can also be maintained even if with water contact ", pass through the survey of following water resistance indexs Determining water resistance index obtained from method is preferably 15 or less, more preferably 14 or less, particularly preferably 10 or less.It can recognize Are as follows: water resistance index is smaller, then hydrophilic water resistance is higher.

When water resistance index is 15 or less, imbibition characteristic (durability of imbibition characteristic) repeatedly, time especially repeatedly Moisture performance (durability of rewetting) becomes better, so more preferably.

In addition, " can also maintain the hydrophily of hydrophilic height even if with water contact " can be used following numerical value to indicate: for As obtained from method identical with the calculating of water resistance index " the 1st imbibition time (second) " and " when the 3rd imbibition Between (second) ", with numerical value (the 3rd imbibition time of the 3rd imbibition time (second) and the ratio between the 1st imbibition time (second) Imbibition time (second) of (second)/1st time) it indicates.Such ratio is preferably 30 or less, is more preferably 20 or less, is especially excellent It is selected as 15 or less.When such ratio is 30 or less, imbibition characteristic (durability of imbibition characteristic) repeatedly, especially repeatedly Rewetting characteristic (durability of rewetting) becomes better, so more preferably.

The hydrophilic water resistance (water resistance index) of fibre finish is evaluated as follows.

It (1) is core for polyethylene terephthalate, high density polyethylene (HDPE) is sheath, compound than (core/sheath, mass ratio) For 60/40 concentric sheath-core type conjugate fiber (fiber number: 2.0dtex, fibre length: 45mm) (for example, Daiwabo Polytec NBF (registered trademark) model (SH) of Co, Ltd. manufacture) assign 0.40 mass % of fibre finish, using parallel combing method and Hot wind method (heating temperature: 135 DEG C, processing time: 10 seconds, wind speed: 1.0m/s), manufactures and prepares nonwoven sample (unit plane Product weight: 20.0g/m², size: vertical 10.0cm × horizontal 10.0cm, thickness: 1.2mm).

Prepare other following articles.

The plate of subsidiary injecting tube (uses EDANA Nonwovens Standard Procedures-Edition 2015 NWSP 070.3.R0 (15) in record Strike-through plate)

0.90% physiological saline (is coloured) with blue dyes

Filter paper (the trade name Lister Paper (Grade989,10cm × 10cm) of MEZGER inc. manufacture)

(2) the imbibition time of nonwoven sample is measured by following methods.

(i) filter paper is laminated 3, nonwoven sample is laminated on it.The plate of subsidiary injecting tube is carried on it.

(ii) from cylinder injection heating to about 37 DEG C physiological saline 5.0ml.Self seeding is measured to rise to nonwoven surface sight Time until examining less than physiological saline (physiological saline that liquid form is not confirmed), as the imbibition time.

(iii) it after standing 30 seconds after imbibition, repeats above-mentioned (ii) and carries out 2 measurements.When the imbibition that total measurement is 3 times Between.

(iv) water resistance index is calculated by following formula.

Formula: the imbibition time (second)-the 1 time imbibition time (second) of water resistance index=3rd time

About the fiber of the first fibrous layer and the fiber of the second fibrous layer show it is wet when " hydrophilic height ", It is not particularly limited as long as the absorbent commodity non-woven fabrics that can obtain target of the present invention.Hydrophilic height when this is wet Degree is evaluated with the evaluation method of following spillings (runoff), and the summation for overflowing the 2nd~5 time is preferably 9.0~30, more excellent It is selected as 9.5~20, particularly preferably 10.0~15.

When the summation for overflowing the 2nd~5 time is 9.0~30, imbibition characteristic repeatedly, rewetting characteristic especially repeatedly become It is better, so more preferably.

In addition, " hydrophilic height " can for using with the identical method of the calculating of summation of overflowing the 2nd~5 time and The 1st~5 time obtained overflow value is indicated with the value (overflowing index) obtained by following formula.

[mathematical expression 1]

Formula:

The value as obtained from this formula (overflowing index) is preferably 13.7~55, and more preferably 14.0~40, especially Preferably 14.5~30.It is imbibition characteristic repeatedly, outstanding when the value (overflow index) as obtained from this formula is 13.7~55 It is that rewetting characteristic repeatedly becomes better, so more preferably.

The hydrophilic height of fibre finish measures spilling as follows to be evaluated.

It is core for polyethylene terephthalate, high density polyethylene (HDPE) is sheath, compound is than (core/sheath, mass ratio) 60/40 concentric sheath-core type conjugate fiber (fiber number: 2.0dtex, fibre length: 45mm) is (for example, Daiwabo Polytec NBF (registered trademark) model (SH) of Co, Ltd. manufacture) assign 0.40 mass % of fibre finish, using parallel combing method and Hot wind method (heating temperature: 135 DEG C, processing time: 10 seconds, wind speed: 1.0m/s), manufactures and prepares nonwoven sample (unit plane Product weight: 20.0g/m², size: vertical 18.0cm × horizontal 7.0cm, thickness: 0.70mm).

To there is the triangular prism traverse of the substantially bottom surface of isosceles right triangle, preparing inclined-plane and horizontal plane has 45 degree of angles The supporting station of degree.Overlapping is laid with 2 filter paper (trade name Lister Paper of MEZGER inc. manufacture on the inclined-plane (Grade989,27.5cm × 14cm)), nonwoven sample and fixation are carried on it.

At the position from non-woven fabrics upper end below 1cm, from micro-pipe pump or buret with the speed of 1.0g/30sec, with Time-consuming 30 seconds 0.90% physiological saline of dropwise addition (being coloured with blue dyes) of the mode for amounting to 1.0g of dripping quantity.Measurement The position of the front end of physiological saline when whole physiological saline are absorbed by non-woven fabrics, the water droplet of physiological saline disappears from nonwoven surface It sets.It finds out the position and physiological saline is added dropwise to the distance between position of nonwoven surface, is i.e. the water droplet of physiological saline exists The longest distance flowed in nonwoven surface.

2nd spilling use nonwoven sample used in the 1st spilling, terminating the measurement overflowed from the 1st time After 30 seconds, in position identical with the 1st dropwise addition position of physiological saline, physiological saline is added dropwise in the same manner as the 1st time, finds out life The distance that reason salt water flows in nonwoven surface.Spilling after 3rd time uses its previous nonwoven sample, similarly Measurement is repeated.

In turn, the fiber for forming the second fibrous layer is applied substantially the same hydrophilic of fiber with the first fibrous layer of formation Property.The fiber of the fiber of first fibrous layer and the second fibrous layer has such hydrophily, therefore, imbibition characteristic repeatedly, more Specially selected from least one of rewetting amount, imbibition time and diffusion length, durability be can further improve repeatedly.

In addition, the fiber for forming the second fibrous layer of fiber and formation of the first fibrous layer has been applied substantially the same parent It is aqueous, thus, the hydrophily of the first fibrous layer and the second fibrous layer will not mix to change so as to cause imbibition characteristic, so It is preferred that.

In the absorbent commodity non-woven fabrics of mode of the invention, above-mentioned first fibrous layer and the respective parent of the second fibrous layer At aqueous height (hydrophiling degree or hydrophilic power) and the fiber assigned to the fiber surface for constituting each fibrous layer Manage hydrophilic water resistance shown by agent (each fibrous layer when water resistance index or each fibrous layer are contacted with water it is hydrophilic Property durability) fiber surface can be used and assign the angle (contact angle) at angle formed by water drops surface on it and carry out table Show.Its contact angle is measured using aftermentioned method.

That is, in the absorbent commodity non-woven fabrics of mode of the invention,

The ion exchange water contact angle (A1) on the surface of the fiber relative to the first fibrous layer of formation before being contacted with water and The ion exchange water contact angle (A2) on the surface of the fiber relative to the second fibrous layer of formation before contacting with water meets following (I),

(I): A1≤80 °, A2≤80 °, | A1-A2 | < 12

The ion exchange water contact angle (B1) on the surface of the fiber relative to the first fibrous layer of formation after being contacted with water and The ion exchange water contact angle (B2) on the surface of the fiber relative to the second fibrous layer of formation after contacting with water meets following (II)。

(II): -5≤(B1-A1) 40 ° of <, -5≤(B2-A2) 40 ° of <

In the absorbent commodity non-woven fabrics of mode of the invention, for relative to before being contacted with water (before penetration by liquid) Form the ion exchange water contact angle (A1) on the surface of the fiber of the first fibrous layer and relative to the fiber for forming the second fibrous layer The ion exchange water contact angle (A2) on surface be illustrated.

A1 and A2 refer to: by about 20 DEG C of surface spray of the ion exchange water to the fiber for forming each fibrous layer, being sprayed The small water droplet of the ion exchange water of mist is attached to fiber surface, the angle at angle formed by the surface of the drop and fiber surface.

A1 and A2 is indicated: in the absorbent commodity non-woven fabrics of mode of the invention, receiving urine, menses etc The hydrophily of fiber layer surface before the liquid be discharged by the wearer (including people, mammal) of absorbent commodity is high It is low.

In the absorbent commodity non-woven fabrics of mode of the invention, A1 and A2 both of which is 80 ° or less (A1≤80 °, A2 ≤80°)。

A1 and A2 both of which is 80 ° hereinafter, therefore, the hydrophily of the hydrophily of the first fibrous layer and the second fibrous layer this It is both sufficiently high, when urine, menses, soft stool etc. are discharged and contact non-woven fabrics, the moisture that includes in these liquid, effluent It is easy dip dyeing with fiber, non-woven fabrics is easy these liquid of transient absorption, moisture.

A1 and A2 both of which be preferably 20 ° or more and 80 ° hereinafter, more preferably 30 ° or more and 75 ° hereinafter, especially excellent 35 ° or more and 75 ° are selected as hereinafter, most preferably 40 ° or more and 70 ° or less.

In the absorbent commodity non-woven fabrics of mode of the invention, the hydrophilic height of the first fibrous layer and the second fibrous layer Spending (hydrophiling degree) is same degree.

Therefore, in the absorbent commodity non-woven fabrics of mode of the invention, the absolute value of the difference of A1 and A2 less than 12 (| A1- A2 | < 12).

The absolute value of the difference of A1 and A2 is less than 12, therefore, in the absorbent commodity non-woven fabrics of mode of the invention, with water Hydrophilic intensity (hydrophiling degree) that the first fibrous layer before contact is played and the second fibrous layer before contacting with water are sent out The hydrophilic intensity (hydrophiling degree) waved is same degree.

That is, for example, the hydrophilic intensity of fibre finish that the fiber for constituting the first fibrous layer handle and Hydrophilic intensity to the fibre finish that the fiber for constituting the second fibrous layer is handled is same degree.

The absolute value of the difference of A1 and A2 are less than 12, and therefore, the hydrophiling degree of the first fibrous layer is hydrophilic with the second fibrous layer Change degree is same degree, and the dip dyeing easness for urine, menses is same degree, is not susceptible to a layer and another layer of phase The case where liquid such as holding urine more high than hydrophily, easy or menses.

The absolute value of the difference of A1 and A2 is preferably 10 or less, more preferably 8 or less, particularly preferably 6 or less.

Then, for the absorbent commodity of mode of the invention in non-woven fabrics relative to (penetration by liquid after being contacted with water The ion exchange water contact angle (B1) on the surface of the fiber of the first fibrous layer of formation afterwards) and relative to the formation after being contacted with water The ion exchange water contact angle (B2) on the surface of the fiber of the second fibrous layer is illustrated.

B1 and B2 refer to: so that about 20 DEG C of ion exchange water 0.04ml is passed through non-woven fabrics, it is right after spontaneously drying non-woven fabrics Spraying about 20 DEG C of the ion exchange water of the nonwoven surface for the part that ion exchange water is passed through, thus adheres to small drop In fiber surface, the angle at angle formed by the surface of the drop and fiber surface.

As long as the absorbent commodity non-woven fabrics of mode of the invention can be obtained, B1 and B2 are not particularly limited, excellent Choosing is less than 90 °.

When B1 and B2 is less than 90 °, the first fibrous layer, the second fibrous layer hydrophily be maintained to a certain extent, i.e., Make also can fully absorb in the case where urine, menses are discharged repeatedly.B1 and B2 be more preferably 30 ° or more and 85 ° or less, Particularly preferably 40 ° or more and 80 ° or less, most preferably 45 ° or more and 80 ° or less.

As long as the absorbent commodity non-woven fabrics of mode of the invention can be obtained, the absolute value of the difference of B1 and B2 does not have It is particularly limited to, preferably smaller than 14.

When the absolute value of the difference of B1 and B2 are less than 14, refer to after contact with water (after penetration by liquid) the first fibrous layer of formation and The hydrophilic height that the surface of the respective fiber of second fibrous layer is played is same degree.That is, the first fibrous layer and second The hydrophilic height (hydrophiling degree) of fibrous layer is same degree, even if for urine, menses after passing through these liquid Dip dyeing easness also reach same degree, be not susceptible to layer hydrophily compared with another layer it is high, be easy keep urine The case where liquid of liquid or menses etc.

The absolute value of the difference of B1 and B2 is more preferably 12 or less, particularly preferably 10 or less, most preferably 8 or less.

Contact angle (A1, A2) and and water in the absorbent commodity non-woven fabrics of mode of the invention, before being contacted with water There are following relationships between contact angle (B1 and B2) after contact.

- 5≤(B1-A1) 40 ° of <, -5≤(B2-A2) 40 ° of <

Since B1-A1 and B2-A2 is in above range, form the fiber table of the first fibrous layer and the second fibrous layer The hydrophilic durability in face, water (such as the liquid such as urine, menses i.e. for being imparted to the fibre finish of fiber surface Moisture contained by body, soft stool etc.) durability it is appropriate, be gently little by little fibre finish into water of dissolution.

It is considered that: the fibrous layer for having been assigned this fibre finish is maintained repeatedly absorb water and be passed water through Hydrophiling degree, and hydrophiling degree slowly reduces, therefore, each fibrous layer is difficult to continue to keep water, is able to suppress in fibrous layer and remains Liquid be back to the returning of nonwoven surface liquid (so-called rewetting) amount.

When B1-A1 and B2-A2 is less than -5 °, fibrous layer after contacting with water becomes excessively high in addition to hydrophiling degree, hydrophiling degree Variation it is also big, therefore, return liquid measure increase.

When B1-A1 and B2-A2 is 40 ° or more, that is, in the case where causing hydrophiling degree to be greatly reduced because contacting with water, The fibrous layer is not only shown by fibrous layer of the hydrophiling degree after contact due to the fiber that is easily reduced with water, or contact with water Hydrophiling degree also low fibrous layer.The water resistance of the hydrophiling degree of such fibrous layer is low, therefore, is held and contacting with water It easily leads to hydrophiling degree to be greatly reduced, it is difficult to repeatedly absorb water (such as urine, menses etc.) and pass water through, be easy to happen water The leakage of (such as urine, menses etc.).

B1-A1 and B2-A2 is preferably -3 ° or more and 35 ° or less, more preferably 0 ° or more and 30 ° or less, is particularly preferably 3 ° or more and 25 ° or less, most preferably 5 ° or more and 20 ° or less.

In the absorbent commodity non-woven fabrics of mode of the invention, the contact angle in the first fibrous layer of front and back is contacted with water Variation (B1-A1) and the variation (B2-A2) of contact angle that is contacted with water in the second fibrous layer of front and back be preferably identical journey Degree.

That is, the difference of B1-A1 and B2-A2, i.e. (B1-A1)-(B2-A2) absolute value (| (B1-A1)-(B2-A2) |) preferably It is 18 or less.

Before and after contacting with water, the variation of the contact angle of the first fibrous layer and the variation of the contact angle of the second fibrous layer are Same degree, therefore, the hydrophilic durability of the first fibrous layer and the hydrophilic water resistance of the second fibrous layer are (that is, form Durability and formation second fibrous layer of the fibre finish adhered on the surface of the fiber of first fibrous layer relative to liquid Fiber on the durability of the fibre finish that adheres to relative to water) be same degree intensity, caused and being contacted with water Hydrophiling degree based on fibre finish equally reduces.

After contacting with water, the hydrophiling degree of any one of the first fibrous layer and the second fibrous layer will not occur (for liquid The compatibility of body) high or extremely low situation, it is easier to reduce it is therefore contemplated that returning liquid measure.

The absolute value of the difference ((B1-A1)-(B2-A2)) of B1-A1 and B2-A2 is more preferably 15 or less, particularly preferably 12 It below, is most preferably 10 or less.

[contact angle determination before penetration by liquid]

The water of the fiber surface of the second fibrous layer of water contact angle and formation about the fiber surface for forming the first fibrous layer Contact angle to each fiber layer surface electrospray ionization exchanged water, and measures the fiber surface and the water drops surface for forming each fibrous layer The angle at formed angle.

The contact angle of water and fiber surface can be measured using following methods.

Zoom lens (KEYENCE will be installed on microscope VHX-1000 that KEYENCE Corporation is manufactured Corporation system, model: VH-Z100R) determination part be fixed in the state of falling along horizontal direction.To include The non-woven fabrics of fiber as contact angle determination object with vertical (direction MD) × horizontal (direction CD) reaches 50mm × 10mm, and this is big Small mode is cut, production measurement sample.In the state that the measurement for measuring sample is face-up, it is set as the side CD of non-woven fabrics Reach vertical direction (that is, in such a way that direction of observation is parallel to the direction CD) to the camera lens face relative to zoom lens, will survey Random sample product are placed in testing stand, and both ends are fixed with adhesive tape.It should be noted that direction of observation (observes object by zoom lens The direction of object) it is not particularly limited as long as being selected in a manner of the side orthogonal with direction of observation upwardly extends as long as by fiber. It can will be in the direction of such as 45° angle degree with the direction CD of non-woven fabrics as direction of observation according to the type of non-woven fabrics.

Then, the sprayer as constant as possible and fine using spraying size blows attached ion exchange to test sample The water droplet of water (about 20 DEG C of water temperature).Blowing within attached 5 seconds, using zoom lens according to the fibre diameter of observed fiber with 50~1000 times are observed the water droplet of carrying on the fiber surface, and typing image.It is repeated to blow and echos image typing, Clearly shown 20 images of water droplet.Select fiber for horizontal image from gained image.This is because fiber inclines Contact angle can change when tiltedly.When selected amount of images is 10 or more, contact angle is found out using their image. When fiber reaches horizontal amount of images less than 10, further obtain 20 images, selected among them repeatedly fiber for Horizontal image, until the sum that fiber is horizontal image reaches 10 or more.

As shown in Figure 1, marking tangent line, contact angle to water droplet at the position that the air contact surfaces of water droplet are in contact with fiber It is set as the tangent line and filamentous angle.Contact angle is using image analysis processing software (for example, can be obtained by Scalar company Two dimensional image analysis software " MicroMeasure ") or protractor etc. be measured.Contact is measured in each image of selection Angle finds out their average value (arithmetic mean of instantaneous value), is denoted as the contact angle of the fiber as measure object.

Contact angle also can use following methods and be measured: be measured without using non-woven fabrics, from aspect of measure take out at For the composition fiber of object, the method that attached water drips is blown to fiber is constituted.

In the measurement of contact angle, it is noted that at aspect below.

(1) contact angle for the water droplet that measurement carries on fiber.Accident hangs down to the water droplet of lower fiber ends and surely across 2 The contact angle of the water droplet of the above fiber.

(2) in the case that fiber generates that helical form etc. is tiny and crispaturas, making to crispatura tails off or upholds fiber and eliminate volume Contracting state, and be measured.

(3) as it appears from the above, the measurement result of contact angle is found out as follows: change measurement site or measurement sample select 10 The above fiber is horizontal image, and measured value is averaged and is found out.When the hydrophiling degree of fiber is high, water when measuring contact angle Drop can move (that is, the shape of water droplet can change) on fiber.At this point, considering its moving state, " contact is found out Angle ".

Until the measurement site of contact angle reaches 20, total less than measurement number (attempts the measurement of shooting water droplet In the total of position, shooting water droplet occur it is mobile with there is a situation where mobile total) 40% water droplet occur In the case where mobile, select 10 or more fibers for horizontal image, and measured value is averaged, as contact angle.

Until the measurement site of contact angle reaches 20,40% or more the total water droplet for measuring number is moved In the case where dynamic, contact angle is set as 20 ° or less.

[measurement of the contact angle after penetration by liquid]

Following operation, the contact angle other than preparing contact angle determination nonwoven sample, before being penetrated with aforesaid liquid Measuring method operate in the same way to be measured.

[preparation of nonwoven sample]

Non-woven fabrics is cut into the size of longitudinal 22cm, transverse direction 5cm, production measurement sample.Then, prepare shown in Fig. 2 The stainless steel panel in the hole of diameter 15mm has been opened with (distance between the center of hole is 20mm) at equal intervals.With oiliness marker pen to plate In the hole of material 4 at be marked.Plate is placed in the aspect of measure of measurement sample.Stainless steel is carried on measurement sample Under conditions of panel, for the aspect of measure for the measurement sample for being located at the hole central part that stainless steel panel is arranged in, use The 0.04ml ion exchange water adjusted to about 20 DEG C is added dropwise in safety pipette (komagome pipette) or buret.It is added dropwise After ion exchange water, the ion exchange water of absorption measurement sample.The water droplet being added dropwise makes to measure from after measurement sample surfaces disappearance Sample is dried in 20~50 DEG C of atmosphere.It should be noted that after water droplet is added dropwise to measurement sample, when absorbing water droplet, The part for remaining water droplet is attracted, can make moisture be forcibly absorbed into downside layer (the second fibrous layer, if there is If).

By the measurement sample dried use by the straight line of point 1 and point 2 in the hole of stainless steel panel shown in Fig. 2 into Row is cut.From be added dropwise have the position of ion exchange water it is corresponding measurement sample section on, about with above-mentioned atomizers spray 20 DEG C of ion exchange water makes water droplet be attached to the fiber of measurement sample.

Hereinafter, using method identical with the measuring method of the contact angle before penetration by liquid, the fiber of Observe and measure sample On water droplet, thus measure water penetrate after contact angle.

About both the first fibrous layer and the second fibrous layer, preferably these fibers use identical fibre finish into Row processing, substantially has been assigned the hydrophily of same degree.Preferably, even if the fibre finish is contacted with water, also can Enough maintain same degree it is wet when hydrophilic height, and with same degree hydrophilic water resistance.

As such fibre finish, can exemplify for example polyglyceryl fatty acid ester, polyether-polyester block copolymer, Polyether modified silicone, aliphatic ester of ethyleneoxide addition polyalcohol etc. will not be de- from fiber surface easily contacting with water From substance.It is, for example, possible to use such fibre finish is coated on the methods of fiber surface, to the first fibrous layer and Two fibrous layers assign the hydrophily of substantially the same degree, in turn, can substantially maintain the hydrophiling degree, i.e. the hydrophily is real There is water resistance in matter.It can be any before or after fiber forms fibrous layer using the processing of the fiber of fibre finish Person.

In the fiber of the fiber of first fibrous layer and the second fibrous layer, using the fiber comprising fibre finish etc. integrally as 100 mass % are preferably attached with the above-mentioned fibre finish of 0.1~1.5 mass %, more preferably 0.2~1.0 mass % of attachment, Further preferably 0.25~0.8 mass % of attachment.By making fibre finish be attached to fiber with specific quantity, desired imbibition is special Property, especially rewetting characteristic become better, so it is preferred that.

The manufacturing method that various webs can be used in first fibrous layer and the second fibrous layer used in the present invention carries out Manufacture.As long as the absorbent commodity non-woven fabrics of target of the present invention can be obtained, manufacturing method is not particularly limited.As Such manufacturing method can be exemplified and be combed such as parallel net, crossing net, right-angled intersection knitmesh, semi-random net and Stochastic Networks Method, air laid etc..

The absorbent commodity non-woven fabrics of mode of the invention can be by Chong Die with the second web simultaneously by the first web Integration manufactures.As long as the absorbent commodity non-woven fabrics of target of the present invention can be obtained, then its manufacturing method is without spy It does not limit.As such manufacturing method, such as hot wind method (hot-air through type heat treating process), heat blow formula heat can be exemplified Facture, hot-rolling method, infrared-type heat treating process, needle point method etc..

The fiber of the first fibrous layer through integrated non-woven fabrics can carry out be bonded with the fiber of the second fibrous layer.

The absorbent commodity non-woven fabrics of mode of the invention further can have non-woven fabrics usually to have as needed Addition layer.

The additional processing such as embossing processing can be implemented with non-woven fabrics as needed for the absorbent commodity of mode of the invention, It can have such additional form and shape etc..

It is excellent that the 10% of the direction MD (mechanical direction) of the absorbent commodity non-woven fabrics of mode of the invention stretches the long duration strenth It is selected as 3.5N/5cm or more, more preferably 6.0N/5cm or more, further preferably 8.5N/5cm or more, is still more preferably 10.0N/5cm or more.In addition, the 20% of the direction MD stretch the long duration strenth be preferably 8.0N/5cm or more, more preferably 10.0N/5cm Above, it is more preferably 13.0N/5cm or more, is still more preferably 15.0N/5cm or more, particularly preferably 18.0N/ 5cm or more.The such range of intensity when by keeping flatness long, the dimensional stability of non-woven fabrics is good, is processed into absorbability The shrinkage in width of non-woven fabrics is suppressed when article, and the processability of non-woven fabrics becomes good.In addition, sense of touch, example from non-woven fabrics From the perspective of drapability, it is preferably 30.0N/5cm or less, preferably 25.0N/5cm that the 10% of the direction MD, which stretches the long duration strenth, It below, is more preferably 20.0N/5cm or less.Above-mentioned intensity is according to JIS L 1096 6.12.1A method (strip method, Strip Method it) is measured.

The absorbent commodity non-woven fabrics of mode of the invention can be used for such as disposable diaper, sanitary napkin, mistake Prohibit the various absorbent commodities such as pad and panty liner.

In turn, the present invention is capable of providing the various absorbent commodities comprising such absorbent commodity non-woven fabrics.

Embodiment

Hereinafter, illustrating the present invention using embodiment and comparative example, but these examples are used to illustrate the present invention, not to this Any restriction is made in invention.

It is described below to use [fiber] to manufacture the non-woven fabrics of embodiment and comparative example.

Fiber 1: polyethylene terephthalate is core, high density polyethylene (HDPE) is sheath, compound than (core/sheath, mass ratio) For 60/40 and fiber number is 2.0dtex (fibre diameter is 15 μm), fibre length is 45mm concentric sheath-core type conjugate fiber (trade name NBF (registered trademark) model (SH) of Daiwabo Polytec Co, Ltd.)

Fiber 2: polyethylene terephthalate is core, high density polyethylene (HDPE) is sheath, compound than (core/sheath, mass ratio) For 60/40 and fiber number is 3.3dtex (fibre diameter is 19 μm), fibre length is 51mm concentric sheath-core type conjugate fiber (trade name NBF (registered trademark) model (SH) of Daiwabo Polytec Co, Ltd.)

Fiber 3: polyethylene terephthalate is core, high density polyethylene (HDPE) is sheath, compound than (core/sheath, mass ratio) For 60/40 and fiber number is 4.4dtex (fibre diameter is 22 μm), fibre length is 51mm concentric sheath-core type conjugate fiber (trade name NBF (registered trademark) model (SH) of Daiwabo Polytec Co, Ltd.)

It is described below to use [fibre finish (hydrophilic agent)] to manufacture the non-woven fabrics of embodiment and comparative example. The hydrophily and durability of following evaluation fibre finish.It should be noted that whole with the fiber comprising fibre finish etc. As quality 100%, the fibre finish of about 0.40 mass % is imparted.

Fibre finish A: comprising C12 potassium alkyl phosphate and with the water-fast hydrophilic fibre inorganic agent of water resistance

Fibre finish B: comprising C12 potassium alkyl phosphate and there is the resistance to of water resistance more higher than fibre finish A Water hydrophilic fibre inorganic agent

Fibre finish C: comprising C12 potassium alkyl phosphate and have more higher than fibre finish B hydrophilic resistance to Water hydrophilic fibre inorganic agent

Fibre finish D: comprising C12 potassium alkyl phosphate and without the hydrophilic fibre inorganic agent of water resistance

[fibre finish it is wet when hydrophilic height (overflow 2~5 times numerical value summation)]

Fibre finish A~D it is wet when hydrophilic height with the spilling (run-off) carried out as follows 2~5 times The summation of numerical value provides.Each numerical value is smaller, then hydrophily is higher, even if the number overflowed increases, numerical value change is smaller, Then water resistance is also higher.Its result can consider: the summation for overflowing 2~5 numerical value is smaller, then hydrophily when moistening is got over It is high.

It is core for polyethylene terephthalate, high density polyethylene (HDPE) is sheath, compound is than (core/sheath, mass ratio) 60/40 concentric sheath-core type conjugate fiber (fiber number: 2.0dtex, fibre length: 45mm) (Daiwabo Polytec Co, Ltd. NBF (registered trademark) model (SH) processed) 0.40 mass % of fibre finish is assigned, use parallel combing method and the (heating of hot wind method Temperature: 135 DEG C, processing the time: 10 seconds, wind speed: 1.0m/s), manufacture and prepare nonwoven sample (weight per unit area: 20.0g/m², size: vertical 18.0cm × horizontal 7.0cm, thickness: 0.70mm).

Show the result in table 1.

It is considered that: according to the sequence of fibre finish D, A, B, C, hydrophily when wet is got higher.

[table 1]

In addition, numerical value is as follows when also calculating for above-mentioned spilling index.

Fibre finish A:19.5

Fibre finish B:14.9

Fibre finish C:13.6

Fibre finish D:61.4

[the hydrophilic water resistance (water resistance index) of fibre finish]

The water resistance index of fibre finish A~D is evaluated by following methods.

It (1) is core to polyethylene terephthalate, high density polyethylene (HDPE) is sheath, compound is than (core/sheath, mass ratio) 60/40 concentric sheath-core type conjugate fiber (fiber number: 2.0dtex, fibre length: 45mm) (Daiwabo Polytec Co, Ltd. NBF (registered trademark) model (SH) processed) 0.40 mass % of fibre finish is assigned, use parallel combing method and the (heating of hot wind method Temperature: 135 DEG C, processing the time: 10 seconds, wind speed: 1.0m/s), manufacture and prepare nonwoven sample (weight per unit area: 20.0g/m², size: vertical 10.0cm × horizontal 10.0cm, thickness: 1.2mm).

Prepare other following articles.

The plate of subsidiary injecting tube (uses EDANA NonwovensStandard Procedures-Edition 2015 NWSP 070.3.R0 (15) in record Strike-through plate)

0.90% physiological saline (is coloured) with blue dyes

(2) method

The imbibition time is measured by following methods.

(iv) water resistance index is calculated by following formula.

The numerical value of the water resistance index of fibre finish A~D is as follows.

Fibre finish A:6.2

Fibre finish B:1.0

Fibre finish C:1.0

Fibre finish D:49.0

It is considered that: water resistance index is smaller, then water resistance is higher.

It is considered that: water resistance gets higher (but B is roughly the same with C) according to the sequence of fibre finish D, A, B, C.

In addition, the imbibition time according to used in the calculating of above-mentioned water resistance index, the 3rd time of fibre finish A~D Ratio (the imbibition time of the 3rd imbibition time (second)/1st time of imbibition time (second) and the 1st imbibition time (second) (second)) it is as follows.It is considered that: the ratio is smaller, then water resistance is higher.

Fibre finish A:8.0

Fibre finish B:2.3

Fibre finish C:2.0

Fibre finish D:50.5

[thickness of non-woven fabrics]

Using thickness measurement machine, (the smart device of Dae Young Co., Ltd.'s science makes made trade name to the thickness of non-woven fabrics THICKNESS GAUGE model: CR-60A), it is measured in the state of applying 300Pa load-carrying to non-woven fabrics.

[liquid pass through before, liquid pass through after contact angle measurement]

Contact angle before the penetration by liquid of non-woven fabrics and after penetration by liquid is measured in aforementioned manners.By its measurement result It is shown in table 4.

[embodiment 1]

Is manufactured as using parallel carding machine using the fiber 1 for the fibre finish A for having been assigned 0.40 mass % First web of one fibrous layer.The weight per unit area of first web is about 8g/m²。

Second is manufactured as using parallel carding machine using the fiber 2 for the fibre finish A for having been assigned 0.4 mass % Second web of fibrous layer.The weight per unit area of second web is about 12g/m²。

First web is overlapped with the second web, carries out heat at 135 DEG C using hot-air through type heat-treating machine Processing, and integration is carried out to obtain the non-woven fabrics of embodiment 1.The weight per unit area of the non-woven fabrics of embodiment 1 is 18.2g/m², with a thickness of 1.32mm.

[embodiment 2~4] and [comparative example 4~5]

For embodiment 2~4 and comparative example 4~5, using the fiber and fibre finish recorded in table 2~3, using with The identical method of the manufacturing method of the non-woven fabrics of above-described embodiment 1, obtains the non-woven fabrics of embodiment 2~4 and comparative example 4~5.

[comparative example 1~3 and 6]

For comparative example 1~3 and 6, using the fiber and fibre finish recorded in table 3, the second web but simultaneously is manufactured It is not laminated, in addition to this, using method identical with the manufacturing method of the non-woven fabrics of above-described embodiment 1, obtains comparative example 1~3 With 6 non-woven fabrics.

For the non-woven fabrics of the obtained embodiment and comparative example, evaluation absorbent articles are manufactured, and evaluate its suction The property received.

[manufacture of absorbent commodity]

Top sheet is taken out from commercially available diaper (the trade name GOO.N (registered trademark) that Daio Seishi KK manufactures) The absorbent commodity of material/the second sheet material/absorber three-decker.Top-sheet is peeled off and removed from the absorbent commodity, The non-woven fabrics of above-described embodiment and comparative example is laminated to replace the top-sheet, to obtain evaluation absorbent commodity.In addition, In stacking, configured in such a way that the first fibrous layer is towards outside.Using the evaluation absorbent commodity, embodiment is evaluated With the absorbency (rewetting, imbibition time and diffusion length) of the non-woven fabrics of comparative example.

[rewetting]

The rewetting of the non-woven fabrics of embodiment and comparative example is evaluated by following methods.

(1) following articles have been prepared in order to measure rewetting amount.

The evaluation absorbent commodity of above-described embodiment and comparative example

The plate of subsidiary injecting tube (internal diameter of cylinder lower part is 2.5cm)

0.90% physiological saline (is coloured) with blue dyes

Filter paper (Japan's filter paper Co. Ltd. system, ADVANTEC (registered trademark) No.2) 10cm × 10cm

Counterweight (5kg) 10cm × 10cm

(2) method

Measure rewetting amount as steps described below.

(i) evaluation is configured in a manner of upward with absorbent commodity by non-woven fabrics (vertical 42em × horizontal 21cm), at it The upper plate for carrying subsidiary injecting tube.

(ii) from cylinder injection heating to about 37 DEG C physiological saline 50ml.It places to nonwoven surface and does not observe physiology Until salt water (physiological saline that liquid form is not confirmed).

(iii) plate of subsidiary injecting tube is unloaded, stands 10 minutes.

(iv) filter paper (30) that measured in advance crosses quality is carried on non-woven fabrics, carries the counterweight 20 of 5kg on it Second.Thereafter the quality of filter paper is measured.It filter paper quality before being carried on non-woven fabrics and is carried on non-woven fabrics and further The difference of filter paper quality after carrying counterweight is equivalent to rewetting amount.

(vi) above-mentioned (i) is returned to, 3 measurements is repeated in (i)~(iv).The rewetting that total evaluation is 4 times.

For a sample (non-woven fabrics), prepare 3 samples.By being averaged for the rewetting amount respectively measured for 3 samples It is worth the rewetting amount as the sample.

Show the result in table 2~3.When the amount of moisture oozed out from non-woven fabrics is fewer, the skin of people more will not be sultry, because This, preferably rewetting value is smaller.

[imbibition time]

When measuring above-mentioned rewetting, measurement does not observe physiological saline (really to nonwoven surface from the injection of physiological saline Recognize the physiological saline less than liquid form) until time, as the imbibition time.

Show the result in table 2~3.When being absorbed with the shorter time, the skin of people more will not be sultry, it is therefore preferable that The numerical value of imbibition time (second) is smaller.

[diffusion length]

When measuring above-mentioned rewetting, the injection from physiological saline after five minutes, the longitudinal direction of evaluation absorbent commodity is measured On absorption physiological saline length, as diffusion length.

Show the result in table 2~3.Consideration can effectively utilize absorbent commodity entirety, it is therefore preferable that diffusion length (cm) Value it is larger.

[table 2]

[table 3]

[table 4]

Embodiment 1 and 4 and comparative example 1 and 3 are compared respectively.Known to: if single layer is laminated, the 3rd time or The rewetting of the 4th, durability repeatedly i.e. relevant to rewetting amount are improved.

Embodiment 3 and comparative example 2 are compared.Known to: if single layer is laminated, when imbibition with the 2nd~4 time Between related durability repeatedly obviously improved.

In embodiment 1,3 and 4 and comparative example 1~3, fibre finish A~C has been used.Known to: fibre finish A~C All have high-hydrophilic and enhanced water resistance.If using these fibre finishs of embodiment, by the way that single layer to be laminated, instead Multiple durability is improved.

Embodiment 1,3~4 is compared with comparative example 4.In embodiment 1,3~4, the first fibrous layer and the second fibrous layer Both of which has used fibre finish A~C with high-hydrophilic and enhanced water resistance, in comparative example 4, the first fibrous layer and Two fibrous layer both of which have been used with high-hydrophilic but with the fibre finish D of low water resistance.Known to: if using having The fibre finish of high-hydrophilic and enhanced water resistance, the then rewetting of the 3rd time and the 4th, i.e. related with rewetting amount repeatedly durable Property and durability repeatedly related with the imbibition time are improved.

It should be noted that making provision against emergencies, comparative example 4 and comparative example 6 are compared.Having used has high-hydrophilic But the fibre finish D with low water resistance.If using fibre finish D, when single layer is laminated, the 3rd~4 suction The liquid time does not have notable difference, but the 3rd~4 rewetting amount deteriorates instead, it can thus be understood that: when stepped construction is made, It is important that using the fibre finish with high-hydrophilic and enhanced water resistance.

Embodiment 1,3~4 is compared with comparative example 5.First fibrous layer and the second fibrous layer both of which use tool There is fibre finish A~C of high-hydrophilic and enhanced water resistance.In embodiment 1,3~4, fibre that the first fibrous layer is handled It is identical as the fibre finish handled the second fibrous layer to tie up inorganic agent, but in comparative example 5, at the first fibrous layer The fibre finish of reason is different from the fibre finish handled the second fibrous layer.At this point, being not confirmed and rewetting and suction The related significant difference of liquid speed degree.

But different fibre finishs is used in the first fibrous layer and the second fibrous layer, and it uses at identical fiber Agent is managed compared to more many and diverse, leads to increased costs.In turn, non-woven fabrics is rolled into a roll, it is especially long-term in the high temperature environment When keeping, the fibre finish of the two is obscured sometimes, can not play specific performance, specially uses different fibre finishs And different hydrophilic interests are made and are substantially also possible to disappear.

Embodiment 1 and embodiment 4 are compared.Known to: use the hydrophilic height and water resistance of fibre finish When not too big fibre finish A (embodiment 1), compared with using fibre finish C (embodiment 4), the 3rd time or the 4th The rewetting of purpose repeatedly is improved.

In addition, the measurement result of contact angle and the measurement result based on spilling are substantially the same.

Industrial availability

The present invention provides non-woven fabrics, absorbent commodity sheet material and the absorbent commodity comprising it.They are preferably selected from matter Ground, rewetting amount, imbibition time, diffusion length, (rewetting amount, imbibition time, diffusion length) durability, cost, preservation repeatedly At least one of property etc. is improved.

Claims

1. a kind of absorbent commodity non-woven fabrics is fine with the first fibrous layer and adjacent with first fibrous layer second The non-woven fabrics of layer is tieed up,

The fiber number for forming the fiber of the first fibrous layer is 1.0dtex~2.8dtex,

The fiber number for forming the fiber of the second fibrous layer is 1.7dtex~5.6dtex,

Even if there are these fibers to connect with water for the fiber for forming the first fibrous layer and the fiber both of which for forming the second fibrous layer Touching can also maintain the hydrophily of their hydrophilic height, and their hydrophily is identical,

2. a kind of absorbent commodity non-woven fabrics is fine with the first fibrous layer and adjacent with first fibrous layer second The non-woven fabrics of layer is tieed up,

The ion exchange water contact angle A1 on the surface of the fiber relative to the first fibrous layer of formation before being contacted with water and relative to The ion exchange water contact angle A2 on the surface of the fiber of the second fibrous layer of formation before contacting with water meets following (I):

(I): A1≤80 °, A2≤≤ 80 °, | A1-A2 | < 12

The ion exchange water contact angle B1 on the surface of the fiber relative to the first fibrous layer of formation after being contacted with water and relative to The ion exchange water contact angle B2 on the surface of the fiber of the second fibrous layer of formation after contacting with water meets following (II):

(II): -5≤(B1-A1) < 40 °, -5≤(B2-A2) < 40 °

3. absorbent commodity non-woven fabrics according to claim 2, wherein it is described contacted with water before contact angle A1 and A2, contacted with water after contact angle B1 and B2 in, difference (B1-A1)-(B2-A2) absolute value of B1-A1 and B2-A2 meet following (III):

(III): | (B1-A1)-(B2-A2) |≤≤ 18.

4. non-woven fabrics described in any one of claim 1 to 3, wherein formed the first fibrous layer fiber include core at It is divided into polyester, the concentric core sheath composite fibre that sheath ingredient is high density polyethylene (HDPE).

5. non-woven fabrics according to any one of claims 1 to 4, wherein the weight per unit area of the second fibrous layer and Weight per unit area/first fibrous layer unit area weight of the ratio between weight per unit area of one fibrous layer, i.e. the second fibrous layer Amount is 0.8~3.0.

6. a kind of absorbent commodity top-sheet, it includes non-woven fabrics according to any one of claims 1 to 5, and with The mode of skin of first fibrous layer towards people configures.

7. a kind of absorbent commodity, it includes top-sheets as claimed in claim 6, and the flesh with the first fibrous layer towards people The mode of skin is configured.