CN205494178U - Once only absorb compound core material of articles for use - Google Patents

Abstract

The utility model relates to the technical field of disposable absorbent articles, in particular to a composite core material for disposable absorbent articles. The composite core material is a multi-layer composite material, including a first covering layer, a hot melt adhesive layer, a high Water absorbent resin layer, high bulky non-woven fabric layer, super absorbent resin layer, hot melt adhesive layer, second covering layer or first covering layer, hot melt adhesive layer, super absorbent resin layer, second covering layer. It is characterized in that one or both of the first and second covering layers are composite dust-free papers composed of low-grammage dry-laid dust-free paper and non-woven fabric. The low-weight dry-process dust-free paper layer of the composite dust-free paper can effectively isolate the polyacrylic acid with a low degree of polymerization that is precipitated after the superabsorbent resin is saturated and absorbs water for a period of time, and reduces the stickiness of the surface layer of the composite core material. The non-woven fabric layer can improve the surface dryness, water absorption speed and liquid diffusion of disposable absorbent products.

Description

Composite core material for disposable absorbent articles

technical field

The utility model relates to the technical field of disposable absorbent articles, in particular to a composite core material of disposable absorbent articles.

Background technique

Infants, young children and other dependent persons often wear absorbent articles, such as diapers. The function of a disposable absorbent article is to contain excreta and to isolate these excreta from the wearer's body and clothing and bedding. Disposable absorbent articles, such as diapers, generally consist of a liquid topsheet, a liquid impermeable backsheet, and an absorbent and liquid containing absorbent core positioned between the liquid permeable topsheet and the liquid impermeable backsheet.

The traditional first-generation absorbent core is an absorbent core structure that is uniformly mixed with fluff pulp and superabsorbent resin, and then wrapped by spray glue of the wrapping layer material. For this absorbent core, since the superabsorbent resin is evenly distributed in the fluff pulp fibers, and the wrapping layer is only combined with upper and lower layer spray glue, there is a large free space for the superabsorbent resin to expand, so the super absorbent core in this absorbent core The utilization rate of the resin is high, and the water absorption rate of the superabsorbent resin is high. But at the same time, in order to reduce the problem of lumping and breaking of cotton in the traditional structure of the absorbent core, hot light pressing or hot net pressing is generally used for compaction, so that the softness of the traditional absorbent core material is reduced.

The second-generation absorbent core is made of a composite core material directly coated with a hydrophilic wrapping layer. Among them, the composite core material includes a first covering layer, a hot-melt adhesive layer, a superabsorbent resin layer, a high-loft non-woven fabric layer, a superabsorbent resin layer, a hot-melt adhesive layer, and a second covering layer. Usually, the first covering The first layer and the second cover layer are dry-laid paper or air-through non-woven fabric with high grammage. For the absorbent core material of this structure, the superabsorbent resin is fixed in the high-loft non-woven fabric layer or between the high-loft non-woven fabric and the cover layer, which can improve the breakage of the superabsorbent resin after absorbing urine. cotton problem. However, since the covering layer is high-weight dry-laid paper or air-through non-woven fabric, high-weight dry-laid paper usually has a unit square weight of 45~60g/m ² , and dry-laid paper can effectively block The polyacrylate with a low degree of polymerization precipitated after the superabsorbent resin is saturated and absorbed can also avoid the leakage of the superabsorbent resin and reduce the grainy feeling ^; A large amount of water will reduce the dryness of the surface layer of the composite core material. However, using hot-air non-woven fabric as the covering layer, and the hot-air non-woven fabric as the composite core material of the covering layer, the surface layer has good hydrophilicity, good liquid diffusion effect, and the surface is dry, but due to the large pores of the hot-air non-woven fabric, there are It has poor isolation effect on polyacrylate with low degree of polymerization, and it is easy to leak polymers.

This patent discloses an improved disposable absorbent product aimed at the disadvantages that the first generation absorbent core is easy to lump and break cotton, and the composite core material used in the second generation absorbent core cannot have both dryness and barrier properties. Composite core material, the composite core material is a multi-layer composite material, including the first cover layer, hot melt adhesive layer, super absorbent resin layer, high bulky non-woven fabric layer, super absorbent resin layer, hot melt adhesive layer , middle cover layer, hot melt adhesive layer, superabsorbent resin layer, second cover layer. It is characterized in that one or both of the first and second covering layers are composite dust-free papers composed of low-grammage dry-laid dust-free paper and non-woven fabric. The low-weight dry-process dust-free paper layer of the composite dust-free paper can effectively isolate the polyacrylic acid with a low degree of polymerization that is precipitated after the superabsorbent resin is saturated and absorbs water for a period of time, and reduces the stickiness of the surface layer of the composite core material. The nonwoven fabric layer can improve disposable absorbent articles

Excellent surface dryness, water absorption speed and liquid diffusivity.

Contents of the invention

The purpose of this utility model is to provide an improved composite core material for disposable absorbent articles in view of the deficiencies in the prior art. It includes a composite absorbent core, and a first covering layer and a second covering layer bonded by a hot-melt adhesive layer on the upper and lower surface layers of the composite absorbent core, and is characterized in that the first covering layer and the second covering layer One of the layers or two layers is a composite dust-free paper composed of a low-weight dry-laid dust-free paper layer and a non-woven fabric layer through thermal bonding, adhesive bonding or ultrasonic bonding.

The composite absorbent core adopts a single-layer composite absorbent core, which is formed by combing hot-melt short fibers into a web to form a high-loft fiber web, and the fibers of the high-loft fiber web are combined with superabsorbent resin particles to form a The single-layer composite absorbent core body; or the composite absorbent core body adopts a multi-layer composite absorbent core body, which is a multi-layer composite absorbent core body composed of a single-layer composite absorbent core body sequentially stacked and compounded, and the single-layer composite absorbent core body An intermediate covering layer is arranged between them.

Further, the composite absorbent core can also be a three-layer composite structure, including a first covering layer, a hot-melt adhesive layer, a superabsorbent resin layer, and a second covering layer. Or the inner surface layer of the second covering layer is uniformly coated with a hot melt adhesive layer, and a composite absorbent core is formed by setting a uniformly distributed superabsorbent resin layer on the hot melt adhesive layer.

Further, the first cover layer, the middle cover layer and the second cover layer are all made of the middle cover layer, which is made of a dry-laid air-laid paper layer with a low grammage and a non-woven fabric layer through thermal bonding, glue bonding or ultrasonic bonding. A composite dust-free paper composed of composites.

Further, the first covering layer adopts the composite dust-free paper.

Further, the composite dust-free paper is used in the middle covering layer.

Further, the composite dust-free paper is used for the second covering layer.

The low grammage dry-process dust-free paper layer adopts low-grammage dust-free paper formed by air-flow forming of wood pulp fibers/hot-melt short fibers; Non-woven fabrics formed by heat sealing process.

The low grammage dry-laid dust-free paper layer adopts dry-laid dust-free paper with a square grammage of 10.0-35.0 g/m ² . The dry strength of the dry-process dust-free paper layer is 0.5~5.0N/25cm, which is formed by air-laid way of wood pulp fiber and hot-melt staple fiber, and the dust-free paper layer web is bonded by heat Combined way to form a dry-laid dust-free paper layer with a strength of 0.5~5.0N/25cm.

The nonwoven fabric layer adopts a hydrophilic spunbond SS nonwoven fabric or a hydrophilic spunbond-meltblown-spunbond SMS nonwoven fabric with a square grammage of 8-20 ^g /m2. Among them, the hydrophilic spunbonded nonwoven fabric utilizes the principle of chemical fiber spinning, and the continuous filaments in the polymer spinning process are directly bonded and hydrophilically treated to make a nonwoven fabric after being spun into a web. Very simple and fast, it can enter the markets of textiles, paper and films in a variety of disposable and durable applications.

The nonwoven fabric layer adopts a hydrophilic air-through nonwoven fabric with a square grammage of 15-30 ^g /m2. Hydrophilic hot air nonwoven fabric is a kind of hot air bonded (hot rolling, hot air) nonwoven fabric. The fiber web is heated to bond the resulting non-woven fabric.

The nonwoven fabric layer of the second covering layer adopts water-resistant spunbond-meltblown-spunbond SMS nonwoven fabric with a square grammage of 10-18 g/m ² . Among them, spunbond-meltblown-spunbond SMS nonwoven fabric belongs to composite nonwoven fabric, which is a composite product of spunbond and meltblown, which has the advantages of high strength, good filtration performance, no adhesive, and non-toxic.

Wherein, the low-gram weight dust-free paper layer and the non-woven fabric layer are combined through thermal bonding, adhesive bonding, and ultrasonic bonding to form a composite dust-free paper. Wherein, the thermal bonding can be hot rolling point bonding or hot oven bonding; adhesive bonding is bonding after spraying hot melt glue; ultrasonic bonding is ultrasonic hot rolling point bonding.

The beneficial effects of the utility model are: the composite dust-free paper of the utility model includes a low-grammage dry-process dust-free paper layer and a non-woven fabric layer, wherein the low-grammage dry-process dust-free paper layer can effectively isolate the superabsorbent resin from being saturated. The polyacrylic acid with low degree of polymerization precipitated after absorbing water and standing for a period of time can reduce the stickiness of the surface layer of the composite core material, and the non-woven fabric layer of the composite dust-free paper can improve the surface dryness, water absorption speed and liquid diffusion of disposable absorbent products sex.

Description of drawings

Fig. 1 is a schematic structural view of a composite core material of a disposable absorbent article.

Fig. 2 is another structural schematic view of a composite core material of a disposable absorbent article.

In the figure, 1 is the first covering layer; 2 is the hot melt adhesive layer; 3 is the superabsorbent resin particles; 4 is the high bulky non-woven fabric; 7 is the second covering layer; 10 is the superabsorbent resin layer.

detailed description

The composite core material of the disposable absorbent article described in the utility model includes a composite absorbent core, and a first covering layer and a second covering layer bonded by a hot-melt adhesive layer on the upper and lower surface layers of the composite absorbent core, One or both of the first cover layer and the second cover layer are made of a low-grammage dry-laid air-laid paper layer and a non-woven fabric layer through thermal bonding, adhesive bonding or ultrasonic bonding. Composed of composite dust-free paper.

The composite absorbent core is a single-layer composite absorbent core formed by combing hot-melt short fibers into a web to form a high-lofty fiber web, and combining high water-absorbent resin particles between the fibers of the high-loft fiber web. Or a multi-layer composite absorbent core formed by stacking single-layer composite absorbent cores sequentially, and an intermediate covering layer is arranged between the single-layer composite absorbent cores.

Further, the composite absorbent core can also be uniformly coated with a hot-melt adhesive layer on the inner surface of the first covering layer or the second covering layer, and an evenly distributed superabsorbent resin layer is arranged on the hot-melt adhesive layer And form the composite absorbent core.

The low grammage dry-process dust-free paper layer adopts low-grammage dust-free paper formed by air-flow forming of wood pulp fibers/hot-melt short fibers; Non-woven fabrics formed by heat sealing process.

In the first cover layer, the middle cover layer or the second cover layer, the first cover layer, the middle cover layer and the second cover layer are all made of a low-gram dry-laid air-laid paper layer and a non-woven fabric layer after heating A composite dust-free paper composed of bonding, glue bonding or ultrasonic bonding; or the composite dust-free paper is used for the first covering layer; or the composite dust-free paper is used for the middle covering layer; or the composite dust-free paper is used for the second covering layer The composite dust-free paper.

The low grammage dry-process dust-free paper layer adopts low-grammage dust-free paper formed by air-flow forming of wood pulp fibers/hot-melt short fibers; Non-woven fabrics formed by heat sealing process.

The hot-melt adhesive layer described in the utility model is a hot-melt pressure-sensitive adhesive composed of polymers such as SBS/SIS, tackifying resins such as rosin resin/petroleum resin, softeners such as naphthenic oil, and antioxidants; Water-absorbent resin is a high-molecular-weight polymer obtained by acrylic acid polymerization. It has a high water retention capacity and a balance of absorption under high load. The absorbed water cannot be squeezed out by simple physical methods, and it can repeatedly release and absorb water. High water absorption Material; the high-loft non-woven fabric layer is a kind of hot-melt fiber such as ES fiber, PP fiber, PET fiber, PE/PET, etc. Air-through nonwovens that are opened, mixed with cotton, carded, and shaped in a hot oven.

Below in conjunction with accompanying drawing, the utility model is further described.

Example 1

As shown in Figure 1, in the high-lofty fiber web formed by hot-melt short fibers or hot-melt short fibers and fluff pulp fibers criss-crossing and intertwined, the high-loft fiber web is subjected to hot air setting treatment to obtain high-lofty fiber webs. In the woven fabric 4, the superabsorbent resin particles 3 are sprayed sequentially on the upper surface and the lower surface layer of the high-loft non-woven fabric 4, and the superabsorbent resin particles 3 are combined between the fibers of the high-loft non-woven fabric 4, and then A composite absorbent core is obtained.

The upper and lower surfaces of the composite absorbent core are coated with a hot melt adhesive layer 2 respectively, and then the first covering layer 1 and the second covering layer 7 are laminated to obtain the composite absorbent core material of the present invention.

As shown in accompanying drawing 1, both the first cover layer 1 and the ^second cover layer 7 are dry-laid dust-free paper layers with a square grammage of ^15-25g /m Composite dust-free paper made of water-heat-air non-woven fabric.

Example 2

Obtain the composite absorbent core material of the present invention according to Example 1.

As shown in accompanying drawing 1, the first covering layer ¹ adopts the dry-laid dust-free paper layer that the square grammage is 15~25g/ ^m2 and the hydrophilic air-through nonwoven fabric that the square grammage is 15~25g/m2 is composited. Composite dust-free paper; the second covering layer 7 is a dry-process dust-free paper layer with a square grammage of 45-50 g/m ² .

Example 3

Obtain the composite absorbent core material of the present invention according to Example 1.

As shown in Figure 1, the first cover layer 1 is a composite non-woven fabric composed of a dry-laid dust ^- free paper layer with a square grammage of 15-25g/ ^m2 and a hydrophilic hot-air nonwoven fabric of 15-25g/m2. Dust paper; the second covering layer 7 adopts a hydrophilic hot-air nonwoven fabric layer with a square gram weight of 20-30g/m ² .

Example 4

Obtain the composite absorbent core material of the present invention according to Example 1.

As shown in Figure 1, the first cover layer ¹ is made of a dry-laid dust-free paper layer with a square grammage of 15~25g/ ^m2 and a hydrophilic hot-air nonwoven fabric with a square grammage of 15~25g/m2 Composite dust-free paper; the ^second cover layer 7 is composed of a dry-laid dust-free paper layer with a square gram weight of 15~25g/m2 and a water ^- resistant spunbond-meltblown-spunbond SMMS nonwoven fabric of 10~20g/m2 Composite dust-free paper.

Example 5

As shown in FIG. 2 , the composite core material includes a first covering layer 1 , a hot melt adhesive layer 2 , a superabsorbent resin layer 10 and a second covering layer 7 . Wherein the first cover layer 1 and the ^second cover layer 7 are both made of a dry-laid dust-free paper layer with a square grammage of 15~25g/ ^m2 and a hydrophilic hot-air nonwoven fabric with a square grammage of 15~25g/m2. Composite dust-free paper.

Example 6

As shown in FIG. 2 , the composite core material includes a first covering layer 1 , a hot melt adhesive layer 2 , a superabsorbent resin layer 10 and a second covering layer 7 . Wherein the first covering layer 1 adopts a composite dust-free paper layer composed of a dry-laid dust ^- free paper layer with a square grammage of 15~25g/ ^m2 and a hydrophilic hot-air nonwoven fabric with a square grammage of 15~25g/m2. Paper; the second covering layer 7 is a dry-laid dust-free paper layer with a square grammage of 45-50 g/m ² .

The above is only a preferred embodiment of the utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the utility model patent application scope are all included in the utility model patent application scope .

Claims (10)

1. The composite core material of disposable absorbent articles, comprising a composite absorbent core, and a first cover layer and a second cover layer bonded by a hot-melt adhesive layer on the upper and lower surface layers of the composite absorbent core, characterized in that : One or both of the first cover layer and the second cover layer are composited by thermal bonding, adhesive bonding or ultrasonic bonding of a low-gram dry-laid air-laid paper layer and a non-woven fabric layer And constitute the composite dust-free paper. 2. The composite core material of disposable absorbent articles according to claim 1, characterized in that: the composite absorbent core is carded into a web with hot-melt short fibers to form a high-loft fiber web, and the high-loft fiber A single-layer composite absorbent core composed of superabsorbent resin particles combined between the fibers of the net. 3. The composite core material of disposable absorbent articles according to claim 1, characterized in that: the composite absorbent core is uniformly coated with a hot melt adhesive layer on the inner surface of the first covering layer or the second covering layer , a composite absorbent core formed by disposing a superabsorbent resin layer on the hot melt adhesive layer. 4. The composite core material for disposable absorbent articles according to claim 1 or 2, characterized in that: the composite absorbent core is a multi-layer composite absorbent core formed by sequentially stacking and compounding single-layer composite absorbent cores A body with an intermediate cover layer disposed between single-layer composite absorbent cores. 5. The composite core material of disposable absorbent articles according to claim 4, characterized in that: the middle covering layer is made of a low-grammage dry-process dust-free paper layer and a non-woven fabric layer through thermal bonding and glue. A composite dust-free paper composed of bonding or ultrasonic bonding. 6. The composite core material for disposable absorbent articles according to claim 1 or 5, wherein the nonwoven fabric layer is made of hot-melt chemical fibers through web-forming and heat-sealing processes. 7. The composite core material of disposable absorbent articles according to claim 1 or 5, characterized in that: the dry-laid dust-free paper layer with a square grammage of 10.0-35.0 g/m2 is used for the low ^- grammage dry-laid paper layer dust-free paper. 8. The composite core material of disposable absorbent articles according to claim 1 or 5, characterized in that: the nonwoven fabric layer is made of hydrophilic spunbond SS nonwoven with a square grammage of 8-20 ^g /m2 cloth or hydrophilic spunbond-meltblown-spunbond SMS nonwovens. 9. The composite core material for disposable absorbent articles according to claim 1 or 5, characterized in that: the non-woven fabric layer is a hydrophilic air-through air-through nonwoven fabric with a square grammage of 15-30 g/m ² . 10. The composite core material of disposable absorbent articles according to claim 1, characterized in that: the non-woven fabric layer of the ^second covering layer adopts water-resistant spunbond with a square grammage of 10-18 g/m2 - Melt blown - spunbond SMS nonwovens.