KR102030656B1 - A Nonwoven Fabric Manufacturing Method Excellent In Pattern Processability And A Nonwoven Fabric - Google Patents

Abstract

The present invention is a method for producing a fiber aggregate excellent pattern workability composite fiber manufacturing step; Fabric assembly step; Composed of lamination step and thermocompression step, the composite fiber manufacturing step is a composite spinning step; The composite spinning step is composed of a cooling step and a stretching step, and the composite spinning step is a cis core composite spinning, and the core part is a polyester resin having an intrinsic viscosity of 0.50 to 0.80 dL / g or a polyurethane having a flow flow index of 12 to 20 g / 10 minutes. The propylene resin is used, and the sheath part uses an olefin resin having a flow flow index of 15 to 25 g / 10 minutes as a second component. The cooling step uses a cooling filter having a pore 0.5 to 1.0 mm and a porosity of 50 to 60%. , Air volume 4 ~ 6m ³ / h, temperature 22 ~ 26 ℃, cooling distance 4 ~ 6mm, the stretching ratio of the stretching step is 3.0 ~ 4.0, the laminating step is the second fiber assembly is laminated to the first fiber assembly or The second fiber assembly is laminated on both sides of the first fiber assembly, and the thermocompression step relates to a method for manufacturing a fiber assembly having excellent pattern workability, characterized in that the heat is applied at a temperature of 5 to 20 ° C. higher than the melting temperature of the sheath portion. will be.

Description

A nonwoven fabric manufacturing method excellent in pattern processability and a nonwoven fabric

The present invention relates to a method for manufacturing a fiber assembly having excellent pattern workability, and a fiber assembly according to the present invention. More specifically, a method for manufacturing a fiber assembly having excellent pattern workability by using a difference in content of the sheath portion of each fiber assembly in two or more layered fiber assembly laminates. And it relates to a fiber aggregate thereby.

Background Art Fiber assemblies have conventionally been used in a wide range of fields such as absorbent articles such as disposable diapers and sanitary napkins, medical articles such as masks, and cleaning articles such as wipers. As described above, the fiber aggregate has been used in various other fields from the prior art, but in fact, when the fiber aggregate is used in a product of each field, it is necessary to be manufactured to have a property or structure suitable for each use.

Therefore, when the fabric assembly is secondary processing (molding) according to the intended use, the processed fiber assembly is 30 to 70% more expensive than the unprocessed fiber assembly, thereby having excellent marketability.

However, because the processing time is long, the productivity is low and the secondary processing cost is also increased. Therefore, it is necessary to develop the fiber assembly productivity by developing a new molding method that can reduce the processing cost.

 Republic of Korea Patent No. 1240750 relates to an elastic fiber assembly having a good stretch recovery and a soft touch at the same time and a method for manufacturing the same. Although there was mention of fixing, there is no improvement in the reduction of processing time by adjusting the cooling conditions after the heat processing.

In addition, the Republic of Korea Patent Publication No. 2011-0065827 relates to a polyester resin with an improved crystallization rate to adjust the content of the antimony catalyst to improve the slow crystallization rate, which is an intrinsic problem of PET, to allow the crystallization to proceed at low temperatures, or to control the composition There was no mention of cooling conditions.

Therefore, the present invention is characterized in that the low-melting-point polyethylene (PE) can improve the recrystallization rate during the thermal processing in a laminated state of two or more layers of a fiber assembly composed of a composite fiber consisting of a sheath portion has an excellent pattern workability.

An object of the present invention is to provide a cooling condition of the composite fiber spinning to improve the cooling rate after melting the fiber assembly component fibers in order to shorten the processing time of the secondary processing (pattern, embossing, etc.) of the fiber assembly.

In addition, the present invention is to provide a binder fiber having a unique composition as a constituent fiber of the fiber aggregate easy to secondary processing.

In another aspect, the present invention is to provide a method for producing a fiber assembly easy to form a pattern by thermal compression by stacking two or more layers of fiber assemblies having different sheath portions.

In order to solve the above problems, the present invention is a method for producing a fiber assembly excellent pattern processing composite fiber manufacturing step; Fabric assembly step; Composed of lamination step and thermocompression step, the composite fiber manufacturing step is a composite spinning step; The composite spinning step is composed of a cooling step and a stretching step, and the composite spinning step is a cis core composite spinning, and the core part is a polyester resin having an intrinsic viscosity of 0.50 to 0.80 dL / g or a polyurethane having a flow flow index of 12 to 20 g / 10 minutes. The propylene resin is used, and the sheath part uses an olefin resin having a flow flow index of 15 to 25 g / 10 minutes as a second component. The cooling step uses a cooling filter having a pore 0.5 to 1.0 mm and a porosity of 50 to 60%. , Air volume 4 ~ 6m ³ / h, temperature 22 ~ 26 ℃, cooling distance 4 ~ 6mm, the stretching ratio of the stretching step is 3.0 ~ 4.0, the laminating step is the second fiber assembly is laminated to the first fiber assembly or The second fiber assembly is laminated on both sides of the first fiber assembly, and the thermocompression step provides a method for manufacturing a fiber assembly having excellent pattern workability, wherein the heat is applied at a temperature 5 to 20 ° C. higher than the melting temperature of the sheath portion. do.

In addition, the present invention is the sheath core composite fiber of the first fiber assembly is 100 to 80% by weight of the sheath portion and 0 to 20% by weight of the core portion, the sheath core composite fiber of the second fiber assembly is 40 to 60% by weight of the sheath portion And it provides a fiber assembly manufacturing method excellent in pattern workability, characterized in that the core portion is 60 to 40% by weight.

In addition, the present invention is the olefin resin of the sheath portion is a high density polyethylene resin,

Melt temperature of the high-density polyethylene resin is 128 ~ 131 ℃, the crystallization temperature is 117 ~ 118 ℃ provides a fiber aggregate manufacturing method excellent in pattern workability characterized by.

In another aspect, the present invention provides a fiber assembly manufacturing method excellent in pattern workability, characterized in that the spinning speed of the composite spinning step is 800 ~ 1200m / min.

In another aspect, the present invention provides a fiber aggregate excellent in the pattern workability prepared by any one of the above manufacturing method.

The present invention is a method of manufacturing a fiber assembly using a composite fiber of the sheath portion is a low melting polyethylene (PE) secondary laminated by thermocompression (pattern, embossing) by stacking two or more layers of the fiber assembly composed of the composite fibers of different sheath content Cooling speed after melting is improved and the pattern shape that can reduce the processing time is clear.

1 is a conceptual diagram of an apparatus used in the method for producing a constituent fiber of a fiber assembly having excellent pattern workability.
2 is a horizontal cross-sectional conceptual view of an apparatus used in the method for producing a constituent fiber of a fiber assembly having excellent pattern workability.
Figure 3a, 3b is a cross-sectional view showing an example of the fiber assembly stacking step of the present invention.
Figure 4 is a cross-sectional view showing an example of the thermocompression step of the present invention.
5 is a cross-sectional view of the fiber assembly in which the pattern shape of the present invention is completed.

Hereinafter, a preferred embodiment of the present invention will be described in detail. First, in describing the present invention, a detailed description of related known functions or configurations will be omitted so as not to obscure the subject matter of the present invention.

As used herein, the terms 'about', 'substantially', and the like, are used at, or in close proximity to, numerical values when manufacturing and material tolerances inherent in the stated meanings are set forth, and an understanding of the present invention may occur. Accurate or absolute figures are used to assist in the prevention of unfair use by unscrupulous infringers.

As used herein, the fiber assembly includes both long fibers and short fibers, and means non-limiting examples of one or more fibers such as woven fabrics, knitted fabrics, nonwoven fabrics, webs, slivers, tows, and the like.

Fiber aggregate manufacturing method excellent in pattern workability is a composite fiber manufacturing step; Fabric assembly step; It consists of a lamination step and a thermocompression step.

The composite fiber manufacturing step is a composite spinning step; It consists of a cooling step and the stretching step, the composite spinning step is a cis core composite spinning and the core part is a polyester resin having a specific viscosity of 0.50 ~ 0.80 dL / g or flow flow index of 12 ~ 20 g / 10 minutes The polypropylene resin is used, and the sheath part uses an olefin resin having a flow flow index of 15 to 25 g / 10 minutes as a second component. The weight ratio of the sheath part and the core part is 40:60 to 60:40 and the spinning speed is 800 to It is characterized by being 1200 m / min and draw ratio 3.0-4.0.

The polyester-based resin is a condensation polymerization product of aromatic dicarboxylic acid and glycol, terephthalic acid, isophthalic acid, phthalic acid, naphthalenedicarboxylic acid and the like can be used as the aromatic dicarboxylic acid, ethylene glycol, 1,3- Propanediol, 1,4-butanediol and the like can be used.

The polyester resin is a polycondensation product of aromatic dicarboxylic acid and glycol, and at least one selected from polyethylene terephthalate, polyethylene 2,6-dinaphthalate, polypropylene terephthalate, polybutylene terephthalate, and polyethylene isophthalate. Will be available

Preferably, polyethylene terephthalate may be used, and the polyester-based resin may preferably use an intrinsic viscosity (IV) of 0.50 to 0.80 dL / g according to ASTM 02857.

Next, polypropylene polymers are very monotonous and have regular structure (more than 90% of isotactic index), so they are easily crystallized. Addition of methyl acrylate, which is a substance, may disturb the alignment of polypropylene polymer chains, thereby increasing the amorphous region, thereby increasing the draw ratio.

The olefin resin may be one or a mixture of two or more selected from high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), polypropylene, and ethylene-propylene copolymer. Preferably, high density polyethylene (HDPE) may be used, and the flow flow index (MI, Melting lndex) of the olefin resin is not particularly limited, but the flow flow index is 5 to 50 g / lO min, more preferably 15 to 25. It would be preferred that it is g / 10 min.

1 is a conceptual diagram of an apparatus used in the method for producing a constituent fiber of a fiber assembly having excellent pattern workability. In the molten state, the resin composition of the first and second components is spun core composite fiber spinning through the composite spinneret 20 in the spinning pack 10.

The cross section of the composite spinneret 20 is circular and a plurality of spinning nozzles are arranged along the circumference at a constant distance from the center of the cross section.

Therefore, a plurality of radiated composite fibers 40 are radiated simultaneously, but are radiated vertically by being located at the edge of the concentric circles at a certain distance from the center.

Next, the cooling step uses a cooling filter 30 positioned at a predetermined distance from the plurality of composite spun fiber 40 is vertically radiated.

The cooling filter 30 has a cylindrical shape with an empty center, and a vertical length of the cooling filter is 5 cm to 20 cm, preferably 5 cm to 10 cm (see FIG. 2).

The cooling filter 30 is characterized in that the pore 0.5 ~ 1.0mm, porosity 50 ~ 60%, the air flow rate 4 ~ 6m ³ / h, the temperature 22 ~ 26 ℃ conditions of the cooling filter 30 and the composite spun fiber ( It is used under the condition that cooling distance (d) with 40) is 4 ~ 6mm.

Next, in the stretching step, the stretch ratio of the stretched composite fiber is cooled to 3.0 to 4.0.

The composite fiber, which has undergone the composite fiber manufacturing step as described above, may be manufactured by a general fiber aggregate manufacturing method.

The manufactured fiber assembly is divided into the first fiber assembly 100 or the second fiber assembly 200 according to the content of the sheath portion and the core portion. The sheath core composite fiber of the first fiber assembly 100 is 100 to 80% by weight of the sheath portion and 0 to 20% by weight of the core portion, and the sheath core composite fiber of the second fiber assembly 200 is 40 to 60 weight of the sheath portion. % And the core portion is characterized by 60 to 40% by weight.

Figure 3 is a cross-sectional view showing an example of the fiber assembly stacking step of the present invention. The second fiber assembly 200 is laminated on the first fiber assembly 100 or the second fiber assembly 200 is laminated on both surfaces of the first fiber assembly 100.

In the first fiber assembly 100, the sheath part is 100-80% by weight, and the sheath part uses an olefin resin having a flow flow index of 15-25 g / 10 minutes. The melting temperature is 128-131 ° C, and the crystallization temperature is 117-118 ° C. Therefore, since the melting point is lower than that of the core part, the sheath part is melted when heated to a temperature higher than that, thereby facilitating thermal bonding. The thermocompression step is characterized in that the heat is applied at a temperature of 5-20 ° C. higher than the melting temperature of the sheath portion. When heated to more than 20 ℃ there may be a deformation of the shape of the core assembly may have a shape deformation of the fiber assembly and the solidification time due to high heat may take long pattern workability. This is because the sheath portion may be partially melted when heated to less than 5 ° C., thereby reducing the adhesive strength between the first and second fiber assemblies.

Figure 4 is a cross-sectional view showing an example of the thermocompression step of the present invention. After pressing thermocompression with the molding apparatus 300 having a pattern shape, the compressed portion is reduced in volume and melt-solidified by heat to bond between the fiber assemblies. Therefore, the other fiber assembly which is not thermally compressed shows a pattern shape compared with the shape as it is in a laminated state.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, these examples are only presented to understand the content of the present invention and should not be construed that the scope of the present invention is necessarily limited to these embodiments.

Example  One

In the composite spinning step, 0 wt% of polyethylene terephthalate having an intrinsic viscosity of 0.64 dL / g as a cis part and 100 wt% of high density polyethylene having a flow flow index of 20 g / 10 min as a core part were respectively melted by a separate extruder. The melted first component and the second component composition were introduced into a conventional core-sheath cross-section composite spinning device, and then the composite fiber in the form of core-sheath was spun at a spinning speed of 800 m / min.

After the cooling step using a cooling filter of 60% porosity, porous filter of 1mm porosity, the cooling air volume was adjusted to 6 Nm ³ / h, cooling air temperature is 25 ℃, the distance between the cooling device and the fiber 5mm.

In the final drawing step, the staple fibers were prepared by orienting the composite spun fiber at a draw ratio of 3.5 times. The first fiber assembly was manufactured using the thus prepared staple fibers. In the second fiber assembly, the content of the sheath part and the core part was 50% by weight, respectively. After the first fiber assembly and the second fiber assembly were laminated, an embossing pattern was subjected to secondary processing at a processing temperature of 145 ° C.

Example  2

The core part composition of the first fiber assembly is composed of 90% by weight of the sheath part and 10% by weight of the core part, and is the same as in Example 1 except that the processing temperature of the thermocompression bonding step is 142 ° C.

Example  3

The core part composition of the first fiber assembly is composed of 80% by weight of the sheath part and 20% by weight of the core part, and is the same as in Example 1 except that the processing temperature of the thermocompression bonding step is 142 ° C.

Comparative example  One

The core part composition of the first fiber assembly is composed of 70% by weight of the sheath part and 30% by weight of the core part, and is the same as in Example 1 except that the processing temperature of the thermocompression bonding step is 148 ° C.

Comparative example  2

The core part composition of the first fiber assembly is composed of 60% by weight of the sheath part and 40% by weight of the core part, and is the same as in Example 1 except that the processing temperature of the thermocompression bonding step is 148 ° C.

Comparative example  3

The core part composition of the first fiber assembly is composed of 50% by weight of the sheath part and 50% by weight of the core part, and is the same as in Example 1 except that the processing temperature of the thermocompression bonding step is 148 ° C.

unit Configuration unit Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Second Fiber Assembly Sisbu weight% 50 45 40 50 50 50 Core part weight% 50 65 60 50 50 50 First Fiber Assembly Sisbu weight% 100 90 80 70 60 50 Core part weight% 0 10 20 30 40 50 Fiber aggregate laminate burglar Kgf (1 inch) 4.5 5.0 5.2 6.0 6.1 6.2 Fiber assembly thermocompression process Processing temperature ℃ 140 142 142 148 148 148 Processing speed m / min 50 50 50 35 30 30 Pattern Visually ◎ ◎ ◎ ○ Δ Δ

 ◎: Pattern boundary is clear with naked eye

  ○: Visually, the boundary is not clear pattern boundary, but there is engraved form

  Δ: Visually borderless pattern boundary

As shown in Table 1, when the cis ratio of the first fiber assembly of the example is 100 to 80% by weight, the maximum processing speed is 50m / min, which is 1.5 times higher than that of the comparative example of 30 to 35m / min, and the pattern engraving is also clearly clear. have.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

10: radiation pack 20: complex radiation detention
30: cooling filter 40: composite spun fiber
d: cooling distance 100: first fiber assembly
200: second fiber assembly 300: molding apparatus

Claims (5)

Fiber aggregate manufacturing method excellent in pattern workability is a composite fiber manufacturing step; Fabric assembly step; Composed of lamination step and thermocompression step,
The composite fiber manufacturing step is a composite spinning step; Consists of cooling stage and stretching stage
The composite spinning step is a system of composite spinning cores by a composite spinneret, the core part is a polyester resin having an intrinsic viscosity of 0.50 to 0.80 dL / g or a polypropylene resin having a flow flow index of 12 to 20 g / 10 minutes as a first component. The sheath part uses an olefin resin having a flow flow index of 15 to 25 g / 10 minutes as a second component.
The cross section of the composite spinneret is circular, and a plurality of spinning nozzles are arranged along the circumference at a constant distance from the center of the cross section, and a plurality of spun composite spun fibers are simultaneously radiated, located at the edges of the concentric circles at a constant distance from the center and vertical. Radiated to
The cooling step uses a hollow hollow cylindrical filter having a void of 0.5 ~ 1.0mm, a porosity of 50 ~ 60%,
Cooling distance of the cooling filter 30 and the composite radiation fiber 40 is 4 ~ 6mm,
The cooling filter has a vertical length of 5cm ~ 20cm, the air flow in the center direction 4 ~ 6m ³ / h, the temperature is cooled to 22 ~ 26 ℃ conditions,
The draw ratio of the drawing step is 3.0 to 4.0,
In the laminating step, the second fiber assembly is laminated on the first fiber assembly or the second fiber assembly is laminated on both sides of the first fiber assembly,
The sheath core composite fiber of the first fiber assembly is 90 to 80% by weight of the sheath part and 10 to 20% by weight of the core part, and the sheath core composite fiber of the second fiber assembly is 40 to 60% by weight of the sheath part and the core part is 60%. ~ 40% by weight,
The thermocompression step is a fiber assembly manufacturing method excellent in pattern workability, characterized in that the heat is applied at a temperature 5 ~ 20 ℃ higher than the melting temperature of the sheath portion.
delete The method of claim 1,
The olefin resin of the sheath part is a high density polyethylene resin,
Melting temperature of the high-density polyethylene resin is 128 ~ 131 ℃, crystallization temperature is 117 ~ 118 ℃ fiber assembly manufacturing method excellent in pattern processability, characterized in that.
The method of claim 1,
The spinning method of the composite spinning step is a fiber assembly manufacturing method excellent in pattern workability, characterized in that 800 ~ 1200m / min.
The fiber assembly excellent in the pattern workability manufactured by the manufacturing method of any one of Claims 1, 3, or 4.

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