CN103637883A - Water-absorption core body for hygienic product and production technology thereof - Google Patents

Abstract

The invention provides a water-absorption core body for a hygienic product. The water-absorption core body for the hygienic product comprises an upper isolating layer, a water absorption layer and a lower isolating layer, wherein the water absorption layer is formed by more than two instantaneous absorption layers and more than one water locking layer in a vertically stacked mode, and the instantaneous absorption layers are arranged on the top layer and the bottom layer of the water absorption layer respectively; each instantaneous absorption layer comprises, by weight, 50-90% of wood pulp fibers and 10-50% of adhesives, and the wood pulp fibers and the adhesives are mixed to form the instantaneous absorption layers; each water locking layer is formed by macromolecule water absorption particles, and the weight of the macromolecule water absorption particles accounts for 15-75% of the weight of the water absorption layer; the upper isolating layer or the lower isolating layer is made of ES fiber layers or dust-free paper or non-woven fabric. According to the water-absorption core body for the hygienic product, due to the fact that the upper isolating layer and the lower isolating layer are adopted, wood pulp dust cannot be generated in the production process, and the water absorption particles cannot easily go out; due to the fact that combination between the instantaneous absorption layers and the water locking layers is adopted, the water absorption speed is high, the quantity of absorbed water is large, water locking performance is good, and the dry and clean state can be kept all the time.

Description

A kind of water-absorbing core body used for sanitary products and its production process

technical field

The present invention relates to the technical field of papermaking, in particular to a water-absorbent core for sanitary products and its production process.

Background technique

Absorbent core is one of the main materials for manufacturing sanitary products such as sanitary napkins, diapers, diapers, and panty liners. The water-absorbent core in the prior art often adopts a three-layer structure, the upper and lower layers are isolation layers or protective layers, and the middle is a water-absorbing particle carrier, and polymer water-absorbent resin particles (SAP) are evenly sprayed on the water-absorbent particle carrier, and the polymer water-absorbent resin As the main water-absorbing material in the water-absorbing carrier, it has good water absorption and water retention.

Chinese patent CN103156737A discloses a water-absorbing core for sanitary products, including more than one water-absorbing core unit, the water-absorbing core unit includes a water-absorbing particle carrier, the upper and lower sides of the water-absorbing particle carrier are provided with protective layers, and the water-absorbing core The polymer water-absorbing resin particles are distributed on the particle carrier, and the distribution of the polymer water-absorbing resin particles on the water-absorbing particle carrier is dense in the middle section and gradually decreases from the middle to both ends. the

Chinese patent CN102700179A discloses a water-absorbing core for sanitary products, the water-absorbing core includes a first dust-free paper layer on the upper layer, a non-woven fabric layer on the middle layer and a second dust-free paper layer on the lower layer , characterized in that: the dust-free paper is made by mixing wood pulp fibers with a weight content of 60-80% and ES fibers with a weight content of 20-40%, and then using a dry papermaking process; the first non-dust paper The dust paper layer and the second dust-free paper layer are thermally melted and bonded along both sides of the non-woven fabric layer to form an edge wrapping. Its disadvantages are: 1. The production process of dust-free paper is easy to produce wood pulp dust; 2. The aperture of the dust-free paper layer is large, and the polymer water-absorbing resin is easy to run out, which makes the human body allergic; 3. The polymer on the non-woven fabric The water-absorbent resin is evenly distributed on the non-woven fabric, and the water-locking ability of the polymer water-absorbent resin cannot be fully utilized, which is easy to cause waste.

Contents of the invention

The purpose of the present invention is to provide a water-absorbent core for sanitary products and its production process in view of the above-mentioned technical problems existing in the prior art.

To achieve the above object, the present invention provides a water-absorbent core for sanitary products, comprising an upper isolation layer, a water-absorbing layer and a lower isolation layer, the water-absorbing layer is composed of more than two layers of instantaneous absorption layers and more than one layer of locks The upper and lower layers of the water layer are superimposed on each other, and the top and bottom layers of the water-absorbing layer are both instant-absorbing layers; in terms of weight percentage, the instant-absorbing layer is composed of 50-90% wood pulp fibers and 10-50% viscose The water-locking layer is made of polymer water-absorbing particles accounting for 15-75% of the weight of the water-absorbing layer; the upper or lower isolation layer is made of ES fiber layer, dust-free paper or non-woven fabric kind of.

Preferably, the adhesive is formed by hot-melting ES fibers. The ES fiber or ES chemical fiber described in the present invention is the abbreviation of "Ethylene-Propylene Side By Side" in English, and is a kind of polyolefin fiber. The fiber is a composite fiber with a double-component skin-core structure. The skin layer has a low melting point and good flexibility, and the core layer has a high melting point and high strength. After the fiber is heat-treated, a part of the cortex is melted to act as a binder, and the wood pulp fiber is bonded to the wood pulp fiber or the wood pulp fiber to the ES fiber to form an instant suction without additional binder. layer molding.

Preferably, the adhesive is hot melt adhesive.

Preferably, the upper isolation layer adopts ES fiber layer, and the lower isolation layer adopts non-woven fabric.

Preferably, the weight of the water-absorbing core is 40-500 g/m ² .

Preferably, the water-locking layer is more than two layers, and the particle size of the polymer water-absorbing particles in the upper water-locking layer is larger than that of the polymer water-absorbing particles in the lower water-locking layer. Since the upper water-locking layer is closer to the human skin, the large-diameter water-absorbing particles are more conducive to the human body feeling dry.

Preferably, the instant absorption layer is two layers, the water-locking layer is one layer, and the water-locking layer is located between the two instant absorption layers.

Preferably, there are three instant absorption layers, two water-locking layers, and each water-locking layer is located between two adjacent instant absorption layers.

the

In order to achieve the above object, the present invention proposes a production process for a water-absorbent core for sanitary products, which comprises the following steps:

(1) Disperse and mix the wood pulp fiber and ES fiber respectively, and add the mixed wood pulp into the barrel; spread the non-woven fabric on the workbench as the lower isolation layer, and install a fan under the non-woven fabric ;

(2) Under the action of the fan, evenly spread the mixed wood pulp on the non-woven fabric to form the first instant absorption layer;

(3) Under the action of the fan, the polymer water-absorbing particles are evenly spread on the first instantaneous absorption layer to form the first water-locking layer;

(4) Under the action of the fan, evenly spread the mixed wood pulp on the first water-locking layer to form the second instant absorption layer;

(5) Under the action of the fan, the polymer water-absorbing particles are evenly spread on the second instantaneous absorption layer to form the second water-locking layer;

(6) Under the action of the fan, spread the mixed wood pulp evenly on the second water-locking layer to form the third instant absorption layer;

(7) Lay the upper isolation layer on the third instantaneous absorption layer;

(8) Put the prepared composite core into an oven at 120-150°C to heat it, wait for it to cool, then roll it up and cut it to obtain a water-absorbent core for sanitary products.

Preferably, in the step (7), under the action of a fan, ES fibers are evenly spread on the third instant suction layer to form an ES fiber layer.

Preferably, in the step (7), under the action of a fan, the non-woven fabric or dust-free paper is spread on the third instant suction layer.

Preferably, the weight ratio of the first instant absorption layer, the second instant absorption layer, and the third instant absorption layer is 30:50:20; the weight ratio of the first water-locking layer and the second water-locking layer is 40 : 60.

The invention makes full use of the technical advantages of the instantaneous absorption layer and the water-locking layer, adopts the instantaneous absorption layer to quickly absorb the liquid, and adopts the water-locking layer to lock the liquid firmly without spilling or spilling.

The present invention adopts two upper and lower isolation layers, no wood pulp dust will be produced in the production process, and the water-absorbing particles are not easy to come out; the combination of the instantaneous absorption layer and the water-locking layer is adopted, the water absorption speed is fast, the water absorption is large, and the water-locking performance is strong. Stay dry all the time.

Description of drawings

Fig. 1 is a sectional view of the water-absorbent core of Examples 1-3.

Fig. 2 is a cross-sectional view of the water-absorbent core of Example 4.

Detailed ways

The features and advantages of the present invention will be described in detail with reference to the accompanying drawings.

Example 1:

As shown in Figure 1, a kind of water-absorbing core body that is used for hygienic articles, comprises upper isolation layer 1, water-absorbing layer 2 and lower isolation layer 3, and described water-absorbing layer 2 is made of three-layer instantaneous absorption layer 21 and two-layer lock The water layer 22 is stacked up and down, and the top and bottom layers of the water-absorbing layer 2 are both instant absorption layers 21; in terms of weight percentage, the instant absorption layer 21 is made of 50% wood pulp fiber and 50% viscose mixture; the water-locking layer 22 is made of polymer water-absorbing particles accounting for 15% of the weight of the water-absorbing layer; , the lower isolation layer 3 is made of non-woven fabric, the weight of the water-absorbing core is 40 g/m ² , the water-locking layer 22 is two layers, and the particle size of the polymer water-absorbing particles in the upper water-locking layer is larger than that of the lower layer. The particle size of polymer water-absorbing particles in the water layer.

A production process for a water-absorbent core for sanitary products, comprising the following steps:

(1) Disperse and mix the wood pulp fiber and ES fiber respectively, and add the mixed wood pulp into the barrel; spread the non-woven fabric on the workbench (lower isolation layer), and set a fan;

(2) Under the action of the fan, evenly spread the mixed wood pulp on the non-woven fabric to form the first instant absorption layer;

(3) Under the action of the fan, the polymer water-absorbing particles are evenly spread on the first instantaneous absorption layer to form the first water-locking layer;

(4) Under the action of the fan, evenly spread the mixed wood pulp on the first water-locking layer to form the second instant absorption layer;

(5) Under the action of the fan, the polymer water-absorbing particles are evenly spread on the second instantaneous absorption layer to form the second water-locking layer;

(6) Under the action of the fan, spread the mixed wood pulp evenly on the second water-locking layer to form the third instant absorption layer; the first instant absorption layer, the second instant absorption layer, and the third instant absorption layer The weight ratio of the first water-locking layer and the second water-locking layer is 40:60.

(7) Under the action of the fan, spread ES fiber evenly above the third instant suction layer to form an ES fiber layer (upper isolation layer);

(8) Put the prepared composite core into an oven at 120-150°C to heat it, wait for it to cool, then roll it up and cut it to obtain a water-absorbent core for sanitary products.

Example 2:

As shown in Figure 1, a kind of water-absorbing core body that is used for hygienic articles, comprises upper isolation layer 1, water-absorbing layer 2 and lower isolation layer 3, and described water-absorbing layer 2 is made of three-layer instantaneous absorption layer 21 and two-layer lock The water layer 22 is stacked up and down, and the top and bottom layers of the water-absorbing layer 2 are both instant absorption layers 21; in terms of weight percentage, the instant absorption layer 21 is composed of 90% wood pulp fibers and 10% viscose The water-locking layer 22 is made of polymer water-absorbing particles accounting for 75% of the weight of the water-absorbing layer; the adhesive is hot-melt adhesive, the upper isolation layer 1 is made of non-woven fabric, and the lower isolation layer Layer 3 is made of non-woven fabric, the weight of the water-absorbing core is 200 g/m ² , the water-locking layer 22 is two layers, and the particle size of the polymer water-absorbing particles in the upper water-locking layer is larger than that in the lower water-locking layer. The particle size of molecular water-absorbing particles.

Example 3:

As shown in Figure 1, a kind of water-absorbing core body that is used for hygienic articles, comprises upper isolation layer 1, water-absorbing layer 2 and lower isolation layer 3, and described water-absorbing layer 2 is made of three-layer instantaneous absorption layer 21 and two-layer lock The water layer 22 is stacked up and down, and the top and bottom layers of the water-absorbing layer 2 are both instant absorption layers 21; in terms of weight percentage, the instant absorption layer 21 is composed of 70% wood pulp fibers and 30% viscose mixture; the water-locking layer 22 is made of polymer water-absorbing particles accounting for 50% of the weight of the water-absorbing layer; , the lower isolation layer 3 adopts an ES fiber layer, the grammage of the water-absorbing core is 300 g/m ² , the water-locking layer 22 is two layers, and the particle size of the polymer water-absorbing particles in the upper water-locking layer is larger than that of the lower layer. The particle size of polymer water-absorbing particles in the water layer.

Example 4:

As shown in Fig. 2, a kind of water-absorbing core body that is used for sanitary articles, comprises upper isolation layer 1, water-absorbing layer 2 and lower isolation layer 3, and described water-absorbing layer 2 is made of two-layer instantaneous absorption layer 21 and one-layer lock The water layer 22 is stacked up and down, and the top and bottom layers of the water-absorbing layer 2 are both instant absorption layers 21; in terms of weight percentage, the instant absorption layer 21 is composed of 90% wood pulp fibers and 10% viscose The water-locking layer 22 is made of polymer water-absorbing particles accounting for 75% of the weight of the water-absorbing layer; the adhesive is hot-melt adhesive, the upper isolation layer 1 is made of non-woven fabric, and the lower isolation layer Layer 3 is made of non-woven fabric, and the weight of the water-absorbing core is 500 g/m ² .

A production process for a water-absorbent core for sanitary products, comprising the following steps:

(1) Disperse and mix the wood pulp fiber and ES fiber respectively, and add the mixed wood pulp into the barrel; spread the non-woven fabric on the workbench as the lower isolation layer, and install a fan under the non-woven fabric ;

(2) Under the action of the fan, evenly spread the mixed wood pulp on the non-woven fabric to form the first instant absorption layer;

(3) Under the action of the fan, the polymer water-absorbing particles are evenly spread on the first instantaneous absorption layer to form the first water-locking layer;

(4) Under the action of the fan, evenly spread the mixed wood pulp on the first water-locking layer to form the second instant absorption layer;

(5) Under the action of the fan, spread ES fiber evenly above the third instant suction layer to form an upper isolation layer;

(6) Put the prepared composite core into an oven at 120-150°C to heat it, wait for it to cool, wind up and cut it, and then obtain a water-absorbent core for sanitary products.

The specific embodiments described herein are merely illustrative of the structure of the present invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (10)

1. A water-absorbing core for sanitary products, comprising an upper isolation layer, a water-absorbing layer and a lower isolation layer, characterized in that: the water-absorbing layer is composed of more than two instantaneous absorption layers and more than one layer of water-locking layers. It is superimposed on each other, and the top and bottom layers of the water-absorbing layer are both instant-absorbing layers; in terms of weight percentage, the instant-absorbing layer is composed of 50-90% wood pulp fibers mixed with 10-50% adhesive The water-locking layer is made of polymer water-absorbing particles accounting for 15-75% of the weight of the water-absorbing layer; the upper or lower isolation layer is made of ES fiber layer, dust-free paper or non-woven fabric . 2. A water-absorbent core for sanitary products as claimed in claim 1, characterized in that: said adhesive is made of ES fiber heat-melted. 3. A water-absorbent core for sanitary products as claimed in claim 1, characterized in that: said adhesive is hot-melt adhesive. 4. A water-absorbent core for sanitary products as claimed in claim 1, characterized in that: the upper isolation layer is made of ES fiber layer, and the lower isolation layer is made of non-woven fabric. 5 . The water-absorbing core for sanitary products according to claim 1 , wherein the weight of the water-absorbing core is 40-500 g/m ² . 6. A water-absorbing core for sanitary products as claimed in claim 1, characterized in that: said water-locking layer has more than two layers, and the particle diameter of polymer water-absorbing particles in the upper water-locking layer is larger than that of the lower water-locking layer The particle size of the polymer water-absorbing particles in the layer. 7. A production process for the water-absorbent core of sanitary products as claimed in claim 1, characterized in that: it comprises the following steps: Disperse and mix the wood pulp fiber and ES fiber respectively, and add the mixed wood pulp into the barrel; spread the non-woven fabric on the workbench, and install a fan under the non-woven fabric; Under the action of the fan, spread the mixed wood pulp evenly on the non-woven fabric to form the first instant absorption layer; Under the action of the fan, the polymer water-absorbing particles are evenly sprinkled on the first instant absorption layer to form the first water-locking layer; Under the action of the fan, spread the mixed wood pulp evenly on the first water-locking layer to form the second instant absorption layer; Under the action of the fan, the polymer water-absorbing particles are evenly spread on the second instantaneous absorption layer to form the second water-locking layer; Under the action of the fan, spread the mixed wood pulp evenly on the second water-locking layer to form the third instant absorption layer; Laying an upper isolation layer on the third instantaneous absorption layer; Then put the prepared composite core into an oven at 120-150° C. to heat it, wait for it to cool, wind up and cut, and then obtain the water-absorbing core for sanitary products. 8. The production process of a water-absorbent core used in sanitary products as claimed in claim 7, characterized in that: in the step (7), under the action of a fan, spread evenly above the third instantaneous absorption layer ES fibers, forming ES fiber layers. 9. The production process of a water-absorbent core for sanitary products as claimed in claim 7, characterized in that: in the step (7), under the action of a fan, the non-woven fabric or dust-free paper is laid flat On the third transient layer. 10. a kind of production technology that is used for the water-absorbent core body of sanitary article as claimed in claim 7, is characterized in that: the weight ratio of described first instant absorption layer, second instant absorption layer, the 3rd instant absorption layer is 30:50:20; the weight ratio of the first water-locking layer to the second water-locking layer is 40:60.