KR100882825B1 - Substrate for manufacturing spunlace nowoven fabrics - Google Patents

Abstract

Materials for manufacturing spun lace non woven fabric is provided to improve strength of the spun lace non woven fabric and simplify a manufacturing process. Materials for manufacturing spun lace non woven fabric is formed with adhesive property synthetic fiber of a chop form and natural pulp as a weight ratio of 80-95:20-5. The natural pulp has a length of 2-6mm, the adhesive property synthetic fiber of the chop form has a length of 5-15mm and includes the low melting point below 110°C. The materials for manufacturing spun lace non woven fabric have first floor structure.

Description

Substrate for manufacturing spunlace nowoven fabrics

The present invention relates to a substrate for manufacturing a spunlace nonwoven fabric, and more specifically, since the natural pulp, which is a main component, is arranged in a paper form, it is environmentally friendly, inexpensive to manufacture, and can improve the strength of the spunlace nonwoven fabric. It relates to a substrate for producing a spunlace nonwoven fabric.

Typically, a spunlace nonwoven fabric refers to a nonwoven fabric in which high-pressure water is sprayed onto a web on which natural or synthetic short fibers are laminated, thereby binding the short fibers constituting the web to each other.

Spunlace nonwoven fabric is mainly used as a material for manufacturing kitchen towels, disposable towels, tissues, sanitary napkins, etc. due to high productivity and low manufacturing cost.

Spunlace nonwovens used as materials such as towels, towels, tissues, cosmetic packs, industrial wipers, etc., must have high wettability due to their characteristics.

Accordingly, in the conventional representative method, a web manufactured by carding with 70 to 80% by weight of biscose rayon short fiber and 20 to 30% by weight polyester short fiber is widely used as a base for spunlace nonwoven fabric. .

However, the conventional spunlace nonwoven substrate as described above has a high manufacturing cost because it contains a large amount of expensive viscose rayon, and the two types of waste materials are discarded because they are mixed with synthetic polyester short fibers and biscose rayon fibers. Since it is difficult to separate the fibers, the incineration process has a problem of polluting the environment.

As another conventional technique, a spunlace nonwoven fabric made of only natural pulp is weak in strength and inferior in friction resistance. Thus, a binder resin is attached to one or both sides of the pulp web to improve its strength and friction resistance. Although a method of improving has been proposed, the conventional method has a problem in that too many binder resins are attached to the surface or both surfaces of the pulp web to reduce the absorbency of natural pulp.

In another conventional technique, (i) a natural pulp or a natural pulp web and (ii) a spunbond web made of long fibers, a meltblown web, a scrim substrate or a woven substrate, and then a water spray method ( A method of manufacturing a spunlace base material by combining them by a water jetting method) has also been proposed, but the conventional method has a problem that it is not environmentally friendly because the process is complicated and incineration has to be disposed of.

As another conventional technique, a method of using a web manufactured by carding only natural short fibers, such as cotton fibers, as a base material for a spunlace nonwoven fabric in order to prevent the environmental pollution problem as described above has been proposed. This complex, too high manufacturing cost and low productivity made it impossible to commercialize disposable wipes.

The problem of the present invention is to use the natural pulp as the main raw material to solve the conventional problems as described above, the manufacturing cost is low and eco-friendly, the wet strength is high, the spunlace nonwoven fabric manufacturing process is possible, the strength of the manufactured spunlace It is to provide a substrate for producing a spunlace nonwoven fabric which can be greatly improved.

The present invention provides a paper of a single layer structure in which natural pulp and chopped adhesive synthetic fibers having a length that can be physically bound in a water spraying process are uniformly mixed with each other to achieve the above objects. It is to provide a substrate for producing a spunlace nonwoven fabric having a structure.

The present invention is a natural pulp constituting the substrate has a length that can be physically bound by the water jetting process (Water Jetting), has a high wet strength and can withstand the pressure applied in the spunlace nonwoven fabric process it is possible to manufacture a spunlace nonwoven fabric It contains a lot of natural pulp and is environmentally friendly, so it is less environmentally polluted at the time of disposal, and because it contains adhesive synthetic fibers in the form of hops, it is possible to greatly improve the strength of the spunlace manufactured from the base material. The opening process and carding process for the production of lace nonwovens can be omitted, and a substrate having a one-layer structure compared to other substrates in which other substrates such as a spunbond web and the like in a pulp or pulp web is water-jetted. Since water jetting (Water-Jetting), the manufacturing process is simplified, and the manufacturing cost is low.

Accordingly, the present invention is useful as a material for producing a spunlace nonwoven fabric used in disposable wipes, tissues, cosmetic mask packs, industrial wipers, and the like.

Hereinafter, the present invention will be described in detail with reference to the drawings.

The spunlace nonwoven fabric substrate according to the present invention has a shape of (Chop) comprising natural pulp having a length of 2 to 6 mm and (ii) a length of 5 to 15 mm and a low melting point polymer of 110 ° C. or less. Has a paper-like structure in which the adhesive synthetic fibers are uniformly mixed with each other, and the weight ratio of the natural pulp and the adhesive synthetic fibers in the form of Chop is 80-95: 20-5, and the one-layer structure. It is characterized in that the strength in the longitudinal direction of 1.5kgf / 5cm or more based on the unit area weight of 45g / ㎡.

First, in the present invention, natural pulp and adhesive synthetic fibers in the form of chop are naturally mixed with each other, that is, adhesiveness in the form of chopped with natural pulp in water, rather than being bound by physical external force. It has a paper-like structure in which synthetic fibers are arranged in a naturally mixed state in a dispersed state.

Generally, a two-layer structure manufactured by reinforcing and bonding a spunbond web composed of long fibers to a pulp or pulp web, a meltblown web, a scrim substrate, or a knitted fabric substrate using a water-jetting method. Although the base material for spunlace manufacture of reinforces the strength etc., the difference between the surface and the back surface generate | occur | produced, and the beating process including long fiber had the problem that it was difficult to collect pulp, and it was difficult to recycle.

However, the present invention is a structure in which the natural pulp and the adhesive synthetic fibers in the form of chop (Chop) is arranged in a paper form, the pulp and the adhesive synthetic fibers in the form of chop (Chop) is uniformly mixed to spray water In the (Water Jetting) process, the natural pulp and the adhesive-bonded synthetic fibers in the form of chop are physically bondable and have high wet strength. The fiber also has a short length of 5 ~ 15mm, which allows for the beating process, making pulp recovery easier.

The natural pulp constituting the substrate for producing a spunlace nonwoven fabric according to the present invention has a length of 2 to 6 mm so as to be physically bound to each other during a water jetting process.

The adhesive synthetic fibers in the form of hops are polyolefin-based fibers, low melting point polyester fibers having a melting point of 90 to 110 ° C., or a core component selected from polyester resins and polypropylene resins as shown in FIG. 2. Core-sheath type fiber etc. which consist of 1 type resin, and a sheath component consist of a low density polyethylene resin and 1 type resin chosen from the low melting point polyester resin of melting | fusing point 90-110 degreeC.

2 is a cross-sectional schematic diagram of the core-sheath type fibers.

If the length of the natural pulp is less than 2 mm or if the length of the adhesive synthetic fiber is less than 5 mm, the natural pulp is swept out of the substrate by the pressure applied in the spunlace nonwoven fabric manufacturing process, and the natural pulp is not physically bound to each other. In addition, the pulp is dropped in the high-pressure water-jetting and the pulp yield in the substrate is lowered, thereby increasing the unit cost and lowering the competitiveness.

The weight ratio of natural pulp and adhesive synthetic fiber in the form of chop is 80-95: 20-5.

In the case where more natural pulp is mixed than the weight ratio, the strength of the spunlace nonwoven fabric is lowered, and if the natural pulp is mixed less than the weight ratio, environmentally friendly properties are lowered.

The base for producing a spunlace nonwoven fabric according to the present invention has a wet strength in the longitudinal direction of 1.5 kgf / 5 cm or more based on a unit weight of 45 g / m 2.

Therefore, the present invention can withstand the pressure applied in the spunlace nonwoven fabric manufacturing process well, and as a result, it is possible to improve the spunlace manufacturing processability and the quality of the manufactured spunlace nonwoven fabric.

Natural pulp constituting the present invention is pulp obtained from wood.

The weight per unit area of the substrate for producing a spunlace nonwoven fabric according to the present invention is preferably 20 to 120 g / m 2, but the weight per unit area may be appropriately adjusted according to the use of the spunlace.

On the other hand, the spunlace nonwoven fabric substrate according to the present invention may further include a natural fiber at the same time as the natural pulp.

Cotton fibers or hemp fibers may be used as the natural fibers.

The natural fiber may be a natural short fiber of 2 to 15m in length, or may be a natural long fiber of more than 15mm in length.

When the length of the natural short fibers is less than 2 mm, the natural short fibers are swept out of the substrate by the pressure applied in the spunlace nonwoven fabric manufacturing process, making it difficult to manufacture the spunlace nonwoven fabric, and the length of the natural short fibers exceeds 15 mm. In this case, the natural short fibers may not be well dispersed in the substrate, which may lower the uniformity of the substrate.

In the present invention, in the case of a disposable wipes or a substrate for the production of disposable wipes, natural pulp is used alone, or natural pulp and natural short fibers are used together, and in the case of a substrate for industrial wiper manufacture, natural pulp and natural long fibers are used to improve physical strength. It is more preferable to use together.

Next, look at an example of a method for producing a substrate for producing a spunlace according to the present invention.

Specifically, 80 to 95% by weight of natural pulp having a length of 2 to 6 mm (based on the total weight of pulp and fibers) and 20 to 5% by weight of the adhesive synthetic fiber of the hop shape (total weight of pulp and fibers) Binder resin is also added and dispersed in water of 3 to 12% by weight relative to the total weight of the natural pulp and adhesive synthetic fiber in the form of chop (Chop) in order to disperse the standard evenly in water and increase the wet strength.

At this time, in the present invention, it is preferable that the beating is gently performed, more preferably, so that the length of the natural pulp dispersed in water is maintained as it is.

Subsequently, the natural pulp and Chop-type adhesive synthetic fibers dispersed evenly in water are carried out in a paper form with a screen or the like as in a conventional papermaking process, followed by drying them to form a spunlace manufacturing substrate according to the present invention. To prepare.

It is preferable to use a curable resin such as an epoxy resin as the binder resin, and the binder resin serves to reinforce the wet strength of the spunlace base material.

In general, the method of manufacturing the substrate by the wet method can be roughly divided into a mesh and a long mesh method, the mesh method is widely used. The advantage of the ring network method is that the homogeneity of the substrate is good, and the disadvantage is that the physical strength is almost 9: 1 in the longitudinal direction: transverse ratio because the orientation of the fiber is made mostly in the longitudinal direction. In case of general product, it is more than minimum strength, and there is no problem, and there is a point of excellent workability due to excellent physical strength in the longitudinal direction during water jetting. On the other hand, in the case of the long mesh method, the length-to-lateral strength ratio is good at about 6: 4, but the longitudinal strength is weaker than that of the mesh method in the water jetting process. The problem is maintaining the strength to the extent that water-jetting is possible. The physical properties of the substrate according to the fiber orientation can be utilized to suit the use of the spunlace nonwoven fabric by combining the mesh type, the long type, or the mesh type and the membrane type.

Next, looking at an example of a method for producing a spunlace nonwoven fabric using the base material 1 for producing a spunlace nonwoven fabric according to the present invention, a spunlace nonwoven fabric can also be produced by the process shown in FIG. 1.

1 is a process schematic diagram of manufacturing a spunlace nonwoven fabric using the substrate 1 for producing a spunlace nonwoven fabric according to the present invention.

Specifically, as shown in FIG. 1, the high pressure water is sprayed on the spunlace nonwoven fabric manufacturing substrate 2 passing through the water injector 2 through the injection nozzle 2a of the water injector 2 from above. By spun downward (Y direction) by spun the natural pulp and the adhesive synthetic fibers contained on the substrate 2 for producing the spunlace nonwoven fabric can be spunlace.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

However, the present invention is not limited by the following examples.

Example  One

Obtained by beating wood pulp at 18 ° SR, 950 kg of wood pulp with an average length of 3 mm and 50 kg of core-cis type polyolefin fiber and 50 kg of epoxy resin in a hop shape having an average length of 10 mm At the same time, after dispersing in the water in the bath, the wood pulp and Chop-shaped core-cis polyolefin-based fibers uniformly dispersed in the water by using a screen is carried out in the form of paper, dried and weighted per unit area The base material 1 for manufacturing the spunlace nonwoven fabric of this 45g / m <2> was manufactured.

Next, the spunlace nonwoven substrate 1 prepared as described above is passed through the spray nozzle 2a of the water spray apparatus 2 while passing under the water spray apparatus 2 as shown in FIG. 1. Spunlace nonwoven fabric was prepared by injecting high pressure water onto (1) and heat-treating at 150 ° C.

The results of evaluating the wet strength and the spunlace nonwoven fabric manufacturing processability of the substrate 1 for producing the spunlace nonwoven fabric prepared as described above are shown in Table 1.

Example 2

A base 1 for producing a spunlace nonwoven fabric and a spunlace nonwoven fabric were prepared in the same manner as in Example 1 except that the average length of the wood pulp was changed to 5 mm and the amount of epoxy resin was changed to 30 kg.

The results of evaluating the wet strength and the spunlace nonwoven fabric manufacturing processability of the substrate 1 for producing the spunlace nonwoven fabric prepared as described above are shown in Table 1.

Example 3

800 kg of wood pulp with an average length of 3 mm, 150 kg of core-sheath type fiber (average length: 10 mm) whose core component is a polyester resin and a sheath component of low density polyethylene resin, 50 kg of cotton fiber having an average length of 15 mm, 30 kg of epoxy resin was simultaneously dispersed in water in a bath, and the wood pulp dispersed in water using a screen was taken up in paper form and dried to produce a spunlace nonwoven fabric having a weight of 45 g / m2 per unit area. 1) was prepared.

Next, the spunlace nonwoven substrate 1 prepared as described above is passed through the spray nozzle 2a of the water spray apparatus 2 while passing under the water spray apparatus 2 as shown in FIG. 1. Spunlace nonwoven fabric was prepared by spraying water at high pressure on (1) and then heat-treating at 130 ° C.

The results of evaluating the wet strength and the spunlace nonwoven fabric manufacturing processability of the substrate 1 for producing the spunlace nonwoven fabric prepared as described above are shown in Table 1.

Comparative Example  One

The wood pulp, obtained by beating wood pulp at 38 ° SR, was dispersed in water in a bath of 1,000 kg of wood pulp less than 1.0 mm in length and 50 kg of epoxy resin in a bath, and then the wood pulp dispersed in water was screened using a screen. The substrate 1 for producing a spunlace nonwoven fabric having a weight per unit area of 45 g / m 2 was prepared after being lifted up in the above-described form.

Next, the spunlace nonwoven substrate 1 prepared as described above is passed through the spray nozzle 2a of the water spray apparatus 2 while passing under the water spray apparatus 2 as shown in FIG. 1. The spunlace nonwoven fabric was manufactured by spraying water of high pressure on (1).

Wet strength and spunlace of the substrate 1 for producing a spunlace nonwoven fabric prepared as described above

The results of evaluating the nonwoven fabric manufacturing processability were as shown in Table 1.

Comparative Example  2

The wood pulp, obtained by beating wood pulp at 18 ° SR, was dispersed in water in a bath of 1,000 kg of wood pulp with an average length of 3.0 mm and 3 kg of epoxy resin in a bath, and then the wood pulp dispersed in water using a screen. The substrate 1 for producing a spunlace nonwoven fabric having a weight per unit area of 45 g / m 2 was prepared after being lifted up in the above-described form.

Next, the spunlace nonwoven substrate 1 prepared as described above is passed through the spray nozzle 2a of the water spray apparatus 2 while passing under the water spray apparatus 2 as shown in FIG. 1. The spunlace nonwoven fabric was manufactured by spraying water of high pressure on (1).

Wet strength and spunlace of the substrate 1 for producing a spunlace nonwoven fabric prepared as described above

The results of evaluating the nonwoven fabric manufacturing processability were as shown in Table 1.

Property / Fairness Evaluation Results division Longitudinal wet strength of the spunlace nonwoven fabric substrate (unit area weight: 45g / ㎡) (kgf / 5㎝) Manufacturing Process of Spunlace Nonwoven Fabric Longitudinal strength (kgf / 5cm) of the manufactured spunlace Example 1 3.0 Good 4.8 Example 2 2.8 Good 4.5 Example 3 2.3 Good 4.3 Comparative Example 1 2.0 Poor (spunlace manufacturing impossible) - Comparative Example 2 0.3 Poor (spunlace manufacturing impossible) -

In the case of Comparative Example 1, the length of the wood pulp is so short that the wood pulp constituting the substrate (1) in the water spraying process for the production of spunlace nonwoven fabric is out of the substrate by the hydraulic pressure, it was impossible to manufacture the spunlace nonwoven fabric, water When recovering the water used in the spraying process, there is a problem in that the recovered water contains too much of natural pulp, which takes a large load when filtering it.

1 is a schematic view of a process for producing a spunlace nonwoven fabric using the substrate 1 for producing a spunlace nonwoven fabric according to the present invention.

2 is a cross-sectional schematic diagram of a core-sheath type fiber included in the present invention.

* Explanation of symbols on the main parts of the drawings

1: Substrate for producing spunlace nonwoven fabric according to the present invention.

2: water injection device 2a: injection nozzle

X: advancing direction of the base material 1

Y: water jet direction

S: Sheath

C: Core Component

Claims (8)

(Iii) natural pulp of 2 to 6 mm in length and (ii) adhesive synthetic fibers in the form of hops containing 5 to 15 mm in length and containing low melting point polymers of 110 ° C. or less uniformly. It has a paper-like structure arranged in a state of being in a state, the weight ratio of the natural pulp and the adhesive synthetic fiber of the shape (Chop) is 80 ~ 95:20 ~ 5, based on the unit area weight of 45g / ㎡ as a single layer structure The spunlace nonwoven fabric base material characterized by the above-mentioned strength of 1.5 kgf / 5 cm or more in the longitudinal direction. The base material for producing a spunlace nonwoven fabric according to claim 1, wherein the adhesive synthetic fiber in the form of chop is one type of fiber selected from polyolefin fiber and polyester fiber having a melting point of 90 to 110 ° C. [Claim 2] The adhesive synthetic fiber of the chopped form according to claim 1, wherein the core component is composed of one resin selected from a polyester resin and a polypropylene resin, and the sheath component is a low density polyethylene resin and a melting point of 90 to 110 ° C. A base for spunlace nonwoven fabric, characterized in that the core-sheath type fibers composed of one resin selected from phosphorus low melting point polyester resins. The substrate for producing a spunlace nonwoven fabric according to claim 1, wherein a weight per unit area of the substrate is 20 to 120 g / m 2. The substrate for producing a spunlace nonwoven fabric according to claim 1, wherein the natural pulp is pulp obtained from wood. The substrate for producing a spunlace nonwoven fabric according to claim 1, further comprising a natural fiber having a length longer than that of the natural pulp. The substrate for producing a spunlace nonwoven fabric according to claim 6, wherein the natural fiber is one selected from cotton fibers and hemp fibers. delete

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