WO2021093257A1

WO2021093257A1 - Gel-free needle-punching absorbent core and sanitary product comprising the core

Info

Publication number: WO2021093257A1
Application number: PCT/CN2020/083138
Authority: WO
Inventors: 刘瑛; 梁国辉
Original assignee: 深圳市棉芯科技有限公司
Priority date: 2019-11-15
Filing date: 2020-04-03
Publication date: 2021-05-20
Also published as: CN110731863A

Abstract

A gel-free needle-punching absorbent core, the core comprising a surface non-woven fabric layer (1), a middle layer and a bottom non-woven fabric layer (4); the middle layer comprises at least one cotton fiber layer (2) and at least one water-superabsorbent resin particle layer (3), and the core is formed by at least one needle-punching process. By means of the needle-punching process, the bottom non-woven fabric layer (4), the surface non-woven fabric layer (1) and the middle layer are interwoven and combined, and a glue application process for a traditional composite core is no longer used, thereby further reducing the existence of chemical substances in a product, not containing hot-melt adhesives, being more environmentally friendly.

Description

Adhesive-free needle-punched absorbent core and sanitary products containing the core

Technical field

This application relates to the field of personal hygiene products, and in particular to a non-adhesive needle-punched absorbent core and sanitary products containing the core.

Background technique

At present, the cores of sanitary products are mainly divided into two categories: wood pulp cores and composite cores: wood pulp cores are formed by mixing fluff pulp and polymer water-absorbent resin (SAP) without layering or partitioning. Wood pulp cores The body has a good water absorption effect, but because its structure is relatively loose, no adhesive is added, and the fluff pulp and SAP cannot be fixed, so there will be lumps and faults during use; the composite core is made of dust-free paper, non-woven It is composed of cloth and SAP, and each layer of material is bonded with hot melt adhesive. The core contains a large amount of SAP to ensure the water absorption of the diaper. After absorbing water, the whole swells, and it is flat and not lumpy. The disadvantage of using a composite core is that the process is more complicated, the equipment production speed is low, and the cost is higher than that of the traditional core. At the same time, due to the large amount of sizing in the composite core, harmful substances such as formaldehyde and volatile organic compounds will be introduced during the production process, which will affect the health of users.

Summary of the invention

The invention combines the high absorbency and strong flow characteristics of the wood pulp core and the advantages of the ultra-thin continuous layer of the composite core. Through the interweaving technology of cotton and non-woven fabrics, it achieves the goal of ensuring excellent product quality. The purpose of not sizing.

A non-adhesive needle-punched absorbent core, which is characterized in that the core includes a surface layer non-woven fabric layer, an intermediate layer and a bottom non-woven fabric layer. The intermediate layer includes at least one cotton fiber layer and at least one high layer. A layer of water-absorbent resin particles, wherein the core is formed through at least one needling process.

Said forming by a needling process at least once, including laying a cotton fiber layer and superabsorbent resin particles on the bottom non-woven fabric and then needling with a barbed machine and then laying a layer of cotton fiber layer and surface layer non-woven fabric. After the cloth layer, a needle punching machine is used for needle punching.

The acupuncture process includes a single needling of the surface layer and a single needling of the bottom layer, and the needling does not penetrate the middle layer;

The acupuncture process includes a single needle punching of the surface layer, a single needle punching of the bottom layer, and the bottom layer of the surface layer does not cross the needle punches twice;

The acupuncture process includes a single needle punch of the surface layer, a single needle punch of the bottom layer, and two needle punches of the bottom layer of the surface layer cross;

The acupuncture process includes a single needling of the surface layer, a single needling of the bottom layer, and the surface needle penetrating the middle layer;

The acupuncture process includes single acupuncture on the surface layer, single acupuncture on the bottom layer, and the bottom needle penetrating the middle layer;

The needling process includes direct needling of the bottom layer, penetrating the bottom layer, the middle layer and the surface layer;

The needling process includes direct needling of the surface layer, penetrating the surface layer, the middle layer and the bottom layer;

The needling process includes direct needling of the middle layer, no needling of the bottom layer and the surface layer, and the surface layer of the bottom layer wrapping the punctured middle layer.

The basis weight of the cotton fiber layer is about 60 g/m ² .

The at least one needling process is that after laying down the layers of the core, needling is carried out with a positive puncture machine or/and a barb puncture machine.

The super absorbent resin particle layer is formed by spraying granular polymer water absorbent resin on the cotton fiber layer.

The cotton fiber layer is an N layer, the super absorbent resin particle layer is an N-1 layer, the cotton fiber layer and the super absorbent resin particle layer are arranged at intervals, and N is an integer of 1-5.

A personal hygiene product, characterized in that it comprises at least one layer of the core.

The personal hygiene products are diapers, pull-up pants or sanitary napkins.

Beneficial effects:

Through the transformation of the existing carding equipment, the carding netting is controlled to achieve low-quantity molding, forming a cotton net (with a basis weight of about 60g/m ² ), and laying it on the bottom non-woven fabric. Combined with the application of the existing composite core powder spraying machine, water-absorbent resin is sprayed quantitatively on the cotton mesh. The needle punching process uses the inherent characteristics of cotton needle barbs to drive the cotton fibers inside the mesh to interweave with the underlying non-woven fabric, and at the same time achieve the purpose of dispersing the water-absorbing resin and achieving uniform distribution.

On the basis of forming the underlying structure, repeat the processes of spreading cotton, dusting, laying surface non-woven fabrics, and needle punching, so that the surface structure and the underlying structure are combined to form a glue-free cotton interwoven composite core. manufacture.

Through the needle punching process, the bottom non-woven fabric is interwoven and combined with the cotton mesh fabric. The traditional composite core sizing process is no longer used, and the presence of chemical substances in the product is reduced again, no hot melt adhesive is contained, and it is more environmentally friendly (only in the product There is a small amount of particulate water-absorbing resin).

The product contains less harmful substances (it has reached no glue), the water-absorbent resin is reduced (saving), and most of the raw materials of the product are degradable (except for the water-absorbent resin, which has poor degradability).

This process belongs to process creation and new product development. Most of the production equipment used in the process has been maturely used in the field of cotton product production. The key point is the adjustment of equipment parameters and the exploration of needle punching density and speed.

This program is the research result of a new generation of sanitary product cores, which fully considers the raw material site, product characteristics, consumer needs, and conducts sufficient research from the aspects of environmental protection and resource utilization.

As an important agricultural product resource in my country, cotton is grown in large quantities in Xinjiang and other places in my country, with large annual output and excellent quality. However, in the application of materials in the textile industry, in recent years, it has been biased towards the application of chemical fibers, which has led to an oversupply of cotton in my country, which has seriously affected the economic income of cotton growers and brought unnecessary social conflicts. Cotton has the characteristics of short planting cycle, long fiber and good water absorption effect. The water absorption of cotton of the same volume is several times that of wood pulp. Cotton is used as an absorbent core in sanitary products, which can give full play to its softness, naturalness and water absorption. , High strength and other characteristics.

The ratio of cotton and water-absorbent resin can be used for high absorption and rapid water retention. Using the cotton fiber interweaving process, the cotton is used as the main structure of the water-absorbing resin to reduce the occurrence of faults during the use of sanitary products. The application of cotton acupuncture technology and the use of a large amount of lower adhesive glue reduces the possible skin irritation and the release of toxic and harmful substances during the use of sanitary products. At the same time, the process takes advantage of the high water absorption effect of cotton, reduces the use ratio of water-absorbing resin, greatly reduces the natural decomposition cycle of waste sanitary products, and contributes to the protection of the ecological environment and the development of the green sanitary products industry.

Description of the drawings

Figure 1 Schematic 1 of the implementation of the application;

Figure 2 Schematic diagram two of the implementation of this application;

Figure 3 Schematic diagram three of the implementation of this application;

Figure 4 Schematic diagram four of the implementation of the present application;

Figure 5 Schematic diagram five of the implementation of the present application;

Figure 6 Schematic diagram six of the implementation manner of the present application;

FIG. 7 is a schematic diagram of the seventh embodiment of the present application.

The above structures are all schematic diagrams, in which the resin particles are dispersed in the cotton layer due to needle punching.

1-Non-woven fabric 2-Cotton layer 3-Super absorbent resin particles 4-Non-woven fabric 5-Cotton fibers that penetrate the upper and lower layers and/or non-woven fabric layers caused by needle punching.

Detailed ways

The cotton fiber layer and the super absorbent resin particle layer of the middle layer and the surface layer or the bottom non-woven fabric are formed by needle punching.

The cotton fiber layer of the middle layer and the surface layer or the bottom non-woven fabric are formed by needle punching.

The needle-punched surface layer and the bottom layer are connected by a cotton fiber layer.

Said forming by at least one needle punching process includes laying a cotton fiber layer and sprinkling super absorbent resin particles on the bottom non-woven fabric and then needle punching with a barbed machine, and then laying a layer of cotton fiber layer and the surface layer non-woven fabric. After the cloth layer, a needle punching machine is used for needle punching.

The basis weight of the cotton fiber layer is about 60 g/m ² .

The needling process includes direct needling of the surface layer, penetrating the surface layer and the bottom layer;

Preferably, the superabsorbent resin particle layer is formed by spraying particulate polymer water-absorbent resin on the cotton fiber layer.

Preferably, the personal hygiene products are diapers, pull-up pants or sanitary napkins.

The barbs are approximately 1000-2500 needles per square, and the surface needles are approximately 1500-3500 needles.

Beneficial effects:

Through the transformation of the existing carding equipment, the carding netting is controlled to achieve low-quantity molding, forming a cotton net (with a basis weight of about 60g/m ² ), and laying it on the bottom non-woven fabric. Combined with the application of the existing composite core powder spreader, water-absorbent resin is sprayed quantitatively on the cotton mesh. The needle punching process uses the inherent characteristics of cotton needle barbs to drive the cotton fibers inside the mesh to interweave with the underlying non-woven fabric, and at the same time achieve the purpose of dispersing the water-absorbing resin and achieving uniform distribution.

This process belongs to process creation and new product development. Most of the production equipment used in the process has been maturely used in the field of cotton product production. The key point is the adjustment of equipment parameters and the exploration of needle punch density and speed.

The barbs are about 1000-2500 needles per square, and the surface needles are about 1500-3500 needles.

Needle-punching density mainly affects hand feel and fabric bonding strength

Claims

A non-adhesive needle-punched absorbent core, which is characterized in that the core includes a surface layer non-woven fabric layer, an intermediate layer and a bottom non-woven fabric layer. The intermediate layer includes at least one cotton fiber layer and at least one high layer. A layer of water-absorbent resin particles, wherein the core is formed through at least one needling process.
The non-adhesive needle-punched absorbent core according to claim 1, wherein the needle-punching process is formed by at least one needle-punching process, and includes barbs after laying a cotton fiber layer and sprinkling a layer of super absorbent resin particles on the bottom non-woven fabric. Needle punching is carried out by the machine, and then a layer of cotton fiber layer and the surface layer of non-woven fabric are laid, and then the needle punching machine is used for needle punching.
The non-adhesive needle-punched absorbent core according to claim 1, wherein the needle-punching process comprises a single needle punching of the surface layer and a single needle punching of the bottom layer, and the needle punching does not penetrate the middle layer or the needle punching of the surface layer and the bottom layer. Needle punching without cross needle punching or needle punching between the surface layer and the bottom layer. The cross needle punching or needling process includes penetrating the middle layer, the bottom layer and the surface layer are not needle punched, and the bottom surface layer wraps the punctured middle layer or the needle punching The process includes a single needling of the surface layer, a single needling of the bottom layer, and the surface needle penetrating the middle layer; the needling process includes the single needling of the surface layer, a single needling of the bottom layer, and the bottom needle penetrating the middle layer.
The non-adhesive needle-punched absorbent core according to claim 1, wherein the needle-punching step includes direct needle punching of the bottom layer, penetrating the bottom layer, the middle layer, and the surface layer, or the needle punching step includes direct needle punching of the surface layer. Thorns penetrate the surface, middle and bottom layers.
The non-adhesive needle-punched absorbent core according to claim 1, wherein the cotton fiber layer has a basis weight of about 60 g/m 2 .
The non-adhesive needle-punched absorbent core according to claim 1, wherein the at least one needle-punching step is to lay each layer of the core and then pass it through a needle punch or/and a barb punch.
The non-adhesive needle-punched absorbent core according to claim 1, wherein the super absorbent resin particle layer is formed by spraying particulate polymer absorbent resin on the cotton fiber layer.
The non-adhesive needle-punched absorbent core according to claim 1, wherein the cotton fiber layer is an N layer, the super absorbent resin particle layer is an N-1 layer, and the cotton fiber layer and the super absorbent core The layers of resin particles are arranged at intervals, and N is an integer of 1-5.
A personal hygiene product, characterized in that it comprises the core according to any one of the above claims.
A personal hygiene product according to claim 9, wherein the personal hygiene product is diapers, pull-up pants or sanitary napkins.