KR101741127B1

KR101741127B1 - Functional paper made of fiber having sound absorption performance

Info

Publication number: KR101741127B1
Application number: KR1020150108271A
Authority: KR
Inventors: 김지윤; 권오혁; 오승진; 이윤정
Original assignee: 주식회사 휴비스
Priority date: 2015-07-30
Filing date: 2015-07-30
Publication date: 2017-05-31
Also published as: KR20170015717A

Abstract

The present invention relates to a papermaking machine, wherein said papermaking comprises 10 to 60% by weight of heteromolecular hollow cross-section short-cut staple fibers of 3 to 24 mm, said heteromolecular hollow section short-cut staple fibers comprising a polyester- Wherein the volume control part is formed of any one of a polyolefin resin, a polyolefin resin, and a polyolefin resin, and the hollow hollow section short-cut staple fiber comprises a hollow part, a shape retaining part and a volume control part, And the end portion is formed in a round shape so as to be spaced apart from adjacent fibers in the aggregate, thereby imparting the sound absorbing property of paper and reducing the diffraction phenomenon of sound energy.

Description

[0001] Functional paper made of sound absorbing fibers [

The present invention relates to functional papers using sound-absorbing fibers, and more particularly, to functional papers using sound-absorbing fibers using short-cut staple fibers having a hollow cross-section, It is about papermaking.

Over the past several decades, as demand for living space has continued to increase, interior materials have been developed that have a variety of functions and constitute buildings.

Among them, the voice of the shock absorber which can shield various noises in modern life is attracting attention as the main property of the interior material.

As a conventional sound absorbing material, a nonwoven fabric based on a glass fiber, a polyurethane, a glass fiber, a putty, a sponge, a thermoplastic resin, and a dough are lightweighted and used as an interlaminar sound absorbing material and a finishing material. In recent years, however, As the user expectation increases, sound-absorbing properties are required not only for existing building materials but also the wallpaper used for the outermost layer in the residential space, and the usage ratio is gradually increasing.

The paper making technology that includes a short cut short fiber of a hollow hollow section based on a thermoplastic resin can provide a paper that can satisfy the negative impact sound as an interior material of a building.

Korean Patent Publication No. 2011-0043066 discloses a technique relating to a wall finishing material improved in sound absorption properties, heat insulation properties, flame retardancy and interior properties, in which a surface matted interior wallpaper and a glass mat are bonded. However, The technology has a problem that the part that plays a role of sound absorption is mainly a glass mat part, the thickness of the finishing material is 3 ~ 10 mm and the sound absorption function of the wallpaper itself is unsatisfactory.

Korean Patent Laid-Open Publication No. 2014-0047206 discloses a technique relating to a fiber aggregate improved in sound absorption performance using short-cut staple fibers. However, the above-mentioned technique is produced by mixing long-cut staple fibers to prevent the short-cut staple fibers from falling off, and above all, the portion that is characterized by a melt blown process in manufacturing is effective in the paper making process There was a problem.

In order to solve the above-mentioned problems, it is an object of the present invention to provide a hollow fiber-reinforced thermosetting fiber-reinforced thermoplastic fiber having a hollow hollow section short-cut staple fiber The present invention also provides a functional paper using the sound-absorbing fiber.

It is another object of the present invention to provide a functional paper using sound-absorbing fibers capable of reducing the diffraction phenomenon of sound energy while imparting sound-absorbing properties of paper.

Another object of the present invention is to provide a functional paper using sound-absorbing fibers having excellent elasticity when sound absorption is secured.

The present invention relates to a papermaking machine, wherein said papermaking comprises 10 to 60% by weight of heteromolecular hollow cross-section short-cut staple fibers of 3 to 24 mm, said heteromolecular hollow section short-cut staple fibers comprising a polyester- Wherein the volume control part is formed of any one of a polyolefin resin, a polyolefin resin, and a polyolefin resin, and the hollow hollow section short-cut staple fiber comprises a hollow part, a shape retaining part and a volume control part, And the distal end is formed in a round shape so as to be spaced apart from adjacent fibers in the aggregate, thereby imparting the sound absorbing property of the paper and reducing the diffraction phenomenon of the sound energy, and provides the functional paper using the sound absorbing fiber.

The present invention also provides a functional paper using sound-absorbing fibers characterized in that the uppermost portion of the volume control end portion of the modified hollow section short-cut staple fiber is defined as a peak and the space between the volume control portions is defined as a valley.

(1) -3? Z? 4

(2) 0.9?

1.8

here,

R: radius of curvature of peak

r: radius of curvature of the valley

Further, the functionalized paper using the sound-absorbing fiber is characterized in that the modified hollow-section short-cut staple fiber satisfies the following conditions.

(3)

≥ 0.80

(4)

≥ 0.30

here,

T1: the distance from the center point M to the peak 310 is the largest value

T2: the distance from the center point M to the peak 310 is the smallest value

t1: the distance from the center point M to the valley 330 is the largest value

t2: the distance from the center point M to the valley 330 is the smallest value

CTmax: the distance from the center point M to the peak 310 on the basis of T1 is a circle formed by connecting the tangent of the volume controller 300 having the next higher order value,

CTmin: T2 is a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,

Ctmax: A circle formed by connecting the tangent of the volume control unit 300 having the next higher order distance from the center point M to the peak 310 with reference to t1

Ctmin: a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,

CTmax-R: Difference value between the center point (CTmaxM) and the center point (M) of CTmax

CTmin-R: Difference value between the center point CTminM of the CTmin and the center point M

Ctmin-r: Difference value between the center point (CtminM) and the center point (M) of Ctmin

The present invention also provides a functional paper using the sound-absorbing fiber, wherein 4 to 12 volume control portions of the modified hollow-section short-cut staple fibers are formed.

In addition, the present invention provides a functional paper using the sound-absorbing fiber, wherein the void ratio of the modified hollow-section short-cut staple fibers is 15 to 30%.

The polyester resin may be at least one selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalic acid (PTT), polyethylene naphthalate (PEN), polyethylene terephthalate glycol (PETG), polycyclohexane And at least one member selected from the group consisting of methylene terephthalate (PCT).

The functional paper using the sound-absorbing fiber according to the present invention as described above has the effect of reducing the diffraction phenomenon of the sound energy while imparting the sound-absorbing property of the paper by including the cut hollow-cut short-cut staple fibers.

In addition, the fiber bundle has the advantage of securing the bulky property by the interference effect of the hollow-section short-cut short fiber volume control part, and has the excellent sound absorbing property due to the sound absorption and the soundproof factor.

1 to 6 are schematic views of a fiber cross section according to a preferred embodiment of the present invention.
7 is a conceptual view of spinning and detaching corresponding to a volume control unit according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that, in the drawings, the same components or parts have the same reference numerals as much as possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

As used herein, the terms "substantially", "substantially", and the like are used herein to refer to a value in or near the numerical value when presenting manufacturing and material tolerances inherent in the meanings mentioned, Absolute numbers are used to prevent unauthorized exploitation by unauthorized intruders of the mentioned disclosure.

As used herein, the term fibrous aggregate refers to a group including at least one kind of fibers such as a fabric, a knitted fabric, a fabric, a nonwoven fabric, a web, a sliver, a tow, and the like.

The functional paper using the sound-absorbing fiber according to the present invention is formed by containing 10 to 60% by weight of the hollow-section hollow-section short-cut staple fibers of 3 to 24 mm.

The modified hollow-section short-cut staple fiber may be formed of any one of a polyester-based resin, a polyamide-based resin, and a polyolin-based resin.

It is most preferable to use a polyester resin among the polyester resin, the polyamide resin and the polyolin resin, and when a polyester resin is used, polyethylene terephthalate (PET), polybutylene terephthalate (PBT At least one member selected from the group consisting of polyethylene terephthalate (PTT), polyethylene naphthalate (PEN), polyethylene terephthalate glycol (PETG) and polycyclohexanedimethylene terephthalate (PCT) Fibers.

The fiber length of the modified hollow section short-cut staple fiber is preferably from 3 to 24 mm, most preferably about 6 mm as shown above.

The above-mentioned hollow hollow-section short-cut staple fibers are formed into a fiber length of a certain length through a cutting process after the production of fibers. The existence of relatively long fibers due to fusion and cutting failure at the fiber cut- The formation of ropes such as cohesion and spun yarns should be suppressed as they may affect the quality of the final product. Thus, it is desirable that the heterogeneous hollow section short-cut staple fibers are cut in the wet state and supplied in the wet state.

The fineness of the deformed hollow section short-cut staple fibers may be variously applied in the range of 4 to 15 De.

The functional paper using the sound-absorbing fiber according to the present invention is a paper in which the sound-absorbing property becomes higher as the content of the hollow-section short-cut staple fiber increases. If the hollow-section short-cut staple fiber is contained in an amount less than 10% by weight, the sound- If it exceeds 60% by weight, the effect of synergy of sound absorption is not so great, and the binding force of the paper may be lowered due to the deterioration of the staple fibers during production. As a result, the short- By weight to 60% by weight.

FIG. 1 is a conceptual view of a modified hollow section short-cut staple fiber according to a preferred embodiment of the present invention, wherein the short fibers 10 are formed by a hollow part 100, a shape retaining part 200 and a volume control part 300 . It is preferable that the hollow portion 100 has a hollow ratio of about 15 to 30% in the total area of the fibers. Above the above range, there may be a problem in fiber formability, and if it is less than the above range, it may have a limit to manifest hollow retention and sound absorption function. The shape retaining part 200 refers to a fibrous shape between the hollow part 100 and the volume control part 300.

The volume control part 300 may protrude in a direction opposite to the center of the fiber, and the distal end may be round. At this time, the uppermost part of the distal end can be defined as the peak 310, and the space between the volume control parts can be defined as the valley 330. At this time, the radius of curvature of the peak may be defined as R, the radius of curvature of the valley may be defined as r, and R and r values that are different from each other may be determined for each volume controller (FIG. 2).

A value T1 is the largest distance from the center point M of the hollow portion 100 to the peak 310 and T2 the smallest distance from the center point M to the peak 310 is the center point M And the distance from the center point M to the valley 330 is defined as t2. On the other hand, a circle formed by connecting the tangent of the volume controller 300 having the next higher order distance from the center point M to the peak 310 on the basis of T1 is referred to as CTmax and T2 is defined as a peak from the center point M A circle formed by connecting the tangent of the volume controller 300 having a smaller distance from the center point M to the peak 310 is referred to as a CTmin and a distance from the center point M to the peak 310 on the basis of t1 is larger And a tangent line of the volume control unit 300 having a smaller distance from the center point M to the peak 310 is connected to the tangent line of the volume control unit 300 When the formed circle is Ctmin; The difference value between the center point CTmaxM of the CTmax and the center point M is denoted by CTmax-R and the difference between the center point CTminM of the CTmin and the center point M is denoted by CTmin-R and the center point CtmaxM of the Ctmax, When the difference value between the center point (CtminM) and the center point (M) of the Ctmin is defined as Ctmin-r, the fiber according to the present invention can satisfy the following conditions. 3 to 6)

When the deviation between the curvature radius R of the peak and the curvature radius r of the valley is defined as Z, the above Z may be defined by the following conditions (1) and (2).

(1) -3? Z? 4

(2) 0.9?

1.8

here,

R: radius of curvature of peak

r: radius of curvature of the valley

Many tests by the present inventors through fiber cross-sectional morphology analysis showed that the volume control portion of one fiber was inserted into the valley between the volume control portions of the adjacent fibers in the outside of the above range to show a structural characteristic as if the gears were engaged, And it is analyzed that it has a bad influence on the uniformity of the fiber aggregate. The volume control part between the fibers interferes with each other within the above range, and the bulky property is maintained. Even if the volume control part is inserted into the valley of the adjacent fiber, the fiber control part can be easily detached by flow or the like, thereby improving uniformity in the fiber aggregate.

The fibers according to the preferred embodiment of the present invention may satisfy the following conditions: CTmax-R, CTmin-R, Ctmax-r, and Ctmin-r.

(3)

≥ 0.80

(4)

≥ 0.30

here,

T1: the distance from the center point M to the peak 310 is the largest value

T2: the distance from the center point M to the peak 310 is the smallest value

t1: the distance from the center point M to the valley 330 is the largest value

The above conditions (3) and (4) may relate to the formation of fibers according to an embodiment of the present invention. Ideally, the value should be 1, but not 1 due to the rheological properties of the polymer. The condition (3) may be related to formation of the volume control portion. Outside of the above range, the deviation of the volume control portion may be large and the variation of the r value may be large, which may affect the carding property in the process or the bulkiness in the fiber aggregate. Condition (4) can be interpreted as fiber morphology, which can affect the formability of hollow portion 100 and shape retaining portion 200. Outside of the above range, hollow formation and fiber shape retention may be unstable.

In order to form the fiber cross-section as described above, the spinneret of the volume controller 300 may be formed in a radial shape as shown in FIG. At this time, an angle (?) Of 10 to 17 degrees with respect to the center point M may be formed. As a result of a number of tests by the present inventors, a fiber cross-sectional shape has been realized which can satisfy the above requirements for manifesting the function of the member 300 as a volume control element of the modified cross section while maintaining the hollowness within the above range.

The cross-sectional shape of the modified hollow-section short-cut staple fibers used in the present invention may be formed to have 4 to 12 volume controls on the fiber surface.

In addition, the modified hollow section short-cut staple fiber according to an embodiment of the present invention may be made of polyester which is a thermoplastic resin as a non-limiting example, and may be formed by spontaneous crimp expression due to a difference in crystallization rate during cooling and solidification, And can contribute to improving the elasticity and elasticity in the nonwoven fabric form.

As described above, the papermaking using the sound-absorbing fiber including the modified hollow section short-cut staple fibers is performed by separating the short-cut staple fibers into individual fibers in water and supplying the dispersion solution to the web apparatus, A web can be formed by selecting one of a group of manufacturing methods including a fourdrinier machine, a cylinder mold machine, and a tilted chisel.

The papermaking components other than the deformed hollow section short-cut staple fibers may include any known natural or synthetic cellulose fibers and recycled fibers including, but not limited to, all known wood fibers and non-wood fibers .

The web produced through the web forming process described above is subjected to a web bonding process through at least one method selected from the group consisting of hydrogen bonding, thermal bonding bonding, PVA binder bonding, latex bonding or spun lace bonding.

Thereafter, in order to improve the smoothness of the produced web, calendering and proper additives may be added for laminating and pore of paper, and thickness control, and there is no limitation in the present invention .

Sound absorption is a phenomenon in which sound is projected on one side of a material, and when it is observed only from that side, the sound that is not reflected is absorbed and permeated by the material, which is apparently absorbed by the material. Is the sound absorption rate. The sound absorption rate depends on the frequency of the sound, the incident angle, the thickness of the material, the installation method, and the situation on the back side. Sound absorption materials with various sound absorption ratios are used to improve the sound effect in the room or to lower the noise level.

Sound is energy, and sound is transmitted by diffraction phenomenon. Because of this characteristic, the sound can be propagated to the outside even in the space where the sound absorbing material is installed.

Accordingly, the short-cut short-cut staple fiber according to the present invention has a function of suppressing sound transmission due to diffraction phenomenon as well as sound absorption.

In the modified hollow section short-cut staple fiber according to the present invention, the volume control section secures the bulky property by the physical interference between the fibers and further secures a space therebetween, so that the sound absorption performance can be improved through vibration of the fiber, .

In addition, since the volume control portion has a specific surface area larger than that of the circular cross section, the energy consumed by the sound energy propagated through the diffraction phenomenon moves along the volume control portion according to the present invention is consumed to reduce the sound energy. Thus, the functional paper using the sound-absorbing fiber according to the present invention can achieve the effect of sound insulation and sound insulation.

Hereinafter, embodiments of the present invention will be described in detail.

Example 1

10% by weight of short-cut staple fibers (PET, 4De x 6 mm) and 90% by weight of natural pulp fibers were mixed and agitated in water using a papermaking method, and 25 x 25 cm (70 ° C, 3 hours) using a drum dryer, and then a wet nonwoven fabric having a basis weight of 100 g / m 2 was prepared.

Example 2

20% by weight of short-cut staple fibers (PET, 4De x 6 mm) and 80% by weight of natural pulp fibers were mixed and stirred in water using a papermaking method, and the subsequent steps are the same as in Example 1.

Example 3

30% by weight of short-cut staple fibers (PET, 4De x 6 mm) and 70% by weight of natural pulp fibers were mixed and stirred in water by a papermaking method, and the subsequent steps are the same as in Example 1.

Comparative Example One

(PET, 1.4De x 6 mm) and 80% by weight of natural pulp fibers were mixed and stirred in water instead of the short-cut short fibers having a hollow hollow section, same.

Comparative Example 2

(PET, 4De x 6 mm) and 80% by weight of natural pulp fibers were mixed and stirred in water instead of the short-cut short fibers having a hollow hollow section, same.

Comparative Example 3

100 wt% of natural pulp fibers are mixed and stirred in water, and the subsequent steps are the same as in Example 1.

The sound absorption ratios of the following Examples 1 to 3 and Comparative Examples 1 to 3 were carried out as follows.

* Sound characteristics

end. Sound absorption rate measurement by reverberation method

It was measured using equipment conforming to ISO 354 (KS F 2805: Sound absorption rate measurement method in reverberation room). The size of the specimen is 1.0m x 1.2m, and the reverberation time is 20dB when compared with the initial eeppressure. The sound source is a 1/3 Octave band sound source. The absorption range was measured in the frequency range from 0.4 to 10 kHz.

division Example 1
(Hz) Example 2
(Hz) Example 3
(Hz) Comparative Example 1
(Hz) Comparative Example 2
(Hz) Comparative Example 3
(Hz) 0.4k 0.023 0.026 0.023 0.036 0.029 0.026 0.5k 0.024 0.024 0.025 0.028 0.024 0.022 0.63k 0.022 0.021 0.025 0.026 0.026 0.027 0.8k 0.033 0.034 0.034 0.035 0.036 0.036 1k 0.058 0.066 0.061 0.06 0.057 0.056 1.25k 0.09 0.094 0.089 0.085 0.081 0.089 1.6k 0.092 0.092 0.093 0.086 0.083 0.096 2k 0.071 0.074 0.078 0.069 0.07 0.077 2.5k 0.078 0.088 0.092 0.066 0.071 0.07 3.15k 0.102 0.156 0.155 0.105 0.098 0.061 4k 0.179 0.245 0.245 0.182 0.112 0.062 5k 0.213 0.299 0.322 0.237 0.188 0.081

Table 1 above compares the absorption rates of Examples 1 to 3 and Comparative Examples 1 to 3 of the wet-laid nonwoven fabric including the hollow hollow-section short-cut staple fibers according to the present invention. In general, the hollow- Examples 1 to 3, which are short fiber-containing papers, exhibit sound absorption properties superior to those of Comparative Examples 1 to 3 within a frequency range of 3 to 6 KHz, which is the frequency of the most sensitive (human voice and musical instrument)

Therefore, it can be confirmed that the functional paper including the hollow hollow-section short-cut staple fibers according to the present invention can be sufficiently used as a room sound-absorbing wallpaper.

100; Hollow portion 200: Shape retaining portion
300:

Claims

In papermaking,
Said papermaking comprising 10 to 60% by weight of heteromolecular hollow section short-cut staple fibers of 3 to 24 mm,
Wherein the modified hollow-section short-cut staple fiber is formed of any one of a polyester-based resin, a polyamide-based resin, and a polyolin-
Wherein the modified hollow section short-cut staple fiber comprises a hollow portion, a shape retaining portion, and a volume control portion,
The volume control part may protrude in a direction opposite to the center of the fiber, and the end part may be formed in a round shape so as to be spaced apart from adjacent fibers in the aggregate, thereby imparting sound absorption of the paper and reducing diffraction phenomenon of sound energy,
Characterized in that the uppermost portion of the volume control end portion of the modified hollow section short-cut staple fiber is defined as a peak and the space between the volume control portions is defined as a valley, the following condition is satisfied.
(1) -3? Z? 4
(2) 0.9?

1.8
here,
Z: Deviation between the curvature radius R of the peak and the curvature radius r of the valley
R: radius of curvature of peak
r: radius of curvature of the valley
(3)

≥ 0.80
(4)

≥ 0.30
here,
T1: the distance from the center point M to the peak 310 is the largest value
T2: the distance from the center point M to the peak 310 is the smallest value
t1: the distance from the center point M to the valley 330 is the largest value
t2: the distance from the center point M to the valley 330 is the smallest value
CTmax: the distance from the center point M to the peak 310 on the basis of T1 is a circle formed by connecting the tangent of the volume controller 300 having the next higher order value,
CTmin: T2 is a circle formed by connecting the tangent of the volume control unit 300 having a distance from the center point M to the peak 310 with a smaller value of the next order,
Ctmax: A circle formed by connecting the tangent of the volume control unit 300 having the next higher order distance from the center point M to the peak 310 with reference to t1
Ctmin: a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,
CTmax-R: Difference value between the center point (CTmaxM) and the center point (M) of CTmax
CTmin-R: Difference value between the center point CTminM of the CTmin and the center point M
Ctmax-r: Difference value between the center point (CtmaxM) and the center point (M) of Ctmax
Ctmin-r: Difference value between the center point (CtminM) and the center point (M) of Ctmin

delete

The method according to claim 1,
Characterized in that 4 to 12 volume control sections of the modified hollow section short-cut staple fibers are formed.

The method according to claim 1,
Characterized in that the void ratio of the modified hollow section short-cut staple fibers is from 15 to 30%.

The method according to claim 1,
The polyester resin may be at least one selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalic acid (PTT), polyethylene naphthalate (PEN), polyethylene terephthalate glycol (PETG), polycyclohexanedimethylene And terephthalate (PCT). &Lt; RTI ID = 0.0 > 11. < / RTI >