JP2003113536A - Binder fiber for wall paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a binder fiber for a wall paper in order to make ruggedness sharp and reduce unevenness when subjected to concavo-convex processing. SOLUTION: This polyester-based binder fiber has 9-16 crimps/inch number of crimps, >=0.6 number of crimps/crimp ratio, <=2.5 bulkiness recovery ratio by heat treatment, <=1.4 eccentricity ratio and core-sheath structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a binder fiber for wallpaper, a nonwoven fabric for wallpaper, and a wallpaper, and in particular, a wallpaper using polyester-based binder fibers, which has a sharp unevenness and little unevenness when subjected to uneven processing. Regarding fibers, etc.

[0002]

2. Description of the Related Art In a wallpaper using a short fiber non-woven fabric,
The technology that gives uneven patterns by embossing is used. However, the unevenness pattern is not sharp due to the floating of the concave portion and the insufficient smoothness of the non-woven fabric before processing, causing a problem of unevenness. These also occur when used for cushion materials, filters, etc.,
The thickness is also large, and bulk fluctuation is not a serious problem in terms of application.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above problems, and a wallpaper binder using polyester binder fibers has a sharp unevenness and a small unevenness when the unevenness is processed. The purpose is to provide fibers, etc.

[0004]

In order to sharpen the unevenness of the wallpaper and reduce the unevenness, the inventors of the present invention should improve the stability and smoothness of the thickness of the raw fabric, that is, the nonwoven fabric, against heat. It turned out to be important.

That is, the present invention has the following structure. 1. It is a polyester fiber having a core-sheath structure, the number of crimps is 9 to 16 pieces / inch, the number of crimps / crimp ratio is 0.6 or more, and the bulk recovery ratio by the heat treatment described in the text is 2.5.
The following is a binder fiber for wallpaper characterized by being: 2. Eccentricity is 1.4 or less, The binder fiber for wallpaper of the 1st characterized by the above-mentioned. 3. The melting point or softening point of the sheath component is 3 than the melting point of the core component.
Lower than 0 ° C, weight ratio of core component / sheath component of 30/70 to
70/30, The binder fiber for wallpaper according to the first or second aspect. 4. The binder fiber for wallpaper according to any one of 1 to 3, wherein the sheath component is a polyester obtained by copolymerizing 25 to 60 mol% of isophthalic acid, and the core component is polyethylene terephthalate. 5. The binder fiber for wallpaper according to any one of items 1 to 4, which has a fineness of 1.1 to 6.6 dtex. 6. The core component contains 0.1 to 5% by weight of pigment,
Moreover, the binder fiber for wallpaper according to any one of 1 to 5, wherein the content of the pigment in the sheath portion is equal to or less than the content of the core component. 7. A non-woven fabric for wallpaper, characterized in that the binder fiber for wallpaper according to the first aspect is used at least in part. 8. A wallpaper characterized by comprising at least a part of the nonwoven fabric for wallpaper according to the seventh aspect. Hereinafter, the present invention will be described in detail.

First, the binder fiber for wallpaper of the present invention is characterized in that the bulk recovery ratio by heat treatment is 2.5 or less. If the bulk recovery ratio exceeds 4, even if a uniform raw material can be obtained by spun lace, flat roll, etc., if the bulk is restored in the subsequent heat step, the unevenness processing cannot be sharpened. It is preferably 2.2 or less, more preferably 2.0 or less.

In order to obtain a binder fiber having a core-sheath structure having a bulk recovery ratio of 2.5 or less, a method of reducing the difference in heat shrinkage between the core component and the sheath component or reducing the eccentricity ratio. and so on. When the difference in the heat shrinkage ratio becomes large or the eccentricity becomes large, the crimps are again developed by the heat treatment in the subsequent step, and the bulk is recovered. In order to achieve it without changing the polymer composition, for example, there is a method of reducing the eccentricity, which can be achieved by setting the eccentricity to 1.4 or less, preferably 1.3 or less.

In order to obtain the smoothness of the original fabric, the number of crimps is 9 to 16 / inch and the number of crimps / crimp ratio is 0.6.
It is important to do the above. When the number of crimps is less than 9 / inch, the card passing property is deteriorated, and problems such as cotton flies occur. As a result, a smooth original fabric cannot be obtained. If it exceeds 16 pcs / inch, the defibration property is deteriorated, and unevenness occurs on the original fabric. It is preferably 10 to 14 pieces / inch. Further, if the number of crimps / crimp ratio is less than 0.6, the width of one crimp in the direction perpendicular to the fiber direction becomes large and the unevenness of the raw fabric becomes large. It is preferably 0.7 or more, more preferably 0.7 to
1.1.

In order to function as a binder, it is possible to use fibers in which the melting point or softening point of the sheath component is lower than that of the core component by 30 ° C. or more, preferably 50 ° C. or more. The melting point or softening point referred to here is a temperature that is difficult to measure in the state of fiber and is defined by measuring in the state of polymer before fiberization. When the temperature difference is 30 ° C. or less, if the temperature is shaken to a high degree due to temperature variations, the polymer of the core component may be damaged and the physical properties of the nonwoven fabric may be deteriorated.

The weight ratio of core component / sheath component is 30/7.
It is 0 to 70/30. If the amount of the core component is out of this range, the adhesive strength is reduced, and if the amount of the sheath component is increased, the amount of the core component is reduced, and the portion of the nonwoven fabric itself which is the core is reduced, resulting in deterioration of the physical properties of the nonwoven fabric.

In order to obtain the above-mentioned composite fiber, it is preferable to use a polymer obtained by copolymerizing 25 to 60 mol% of isophthalic acid as a sheath component. When the isophthalic acid content is 25 mol% or less, the melting point becomes high, the temperature in the nonwoven fabric manufacturing process becomes high, and the polymer of the core component or other fibers blended with each other becomes large, which is not preferable. Further, if it is 60 mol% or more, the melting point is excessively lowered, and the durability in use in a final product or the like is deteriorated, which is also not preferable.

The fineness of such fibers is 1.1 to 6.
6 dtex is preferred. When it is 1.1 dtex or less, the card passing property is deteriorated and the cost is increased due to the decrease in productivity. When it is 6.6 dtex or more, the non-woven fabric becomes coarse, and when the non-woven fabric is printed or embossed, the sharpness may be poor.

It is possible to make the fiber soft by including a pigment in the fiber of the present invention. As a result, it is possible to clearly shape the unevenness when the unevenness is processed with the softening of the nonwoven fabric. In order to further improve the softness of the nonwoven fabric, the content of the pigment of the core component is 0.1 to 5% by weight, preferably 0.3 to 3% by weight, and the content of the pigment of the core component is ≧ the pigment of the sheath portion. The amount is preferable. When the content of the core component pigment is 0.1% by weight or less, the softening effect is small, and when it is 5% by weight or more, spinning operability may be deteriorated. In addition, it is effective to soften the core component to soften the non-woven fabric.
The pigment content of the sheath is preferably used.

The term "pigment" used in the present invention means, as inorganic pigments, zinc oxide (zinc white), titanium oxide (rutile type,
Anatase type), antimony trioxide, iron oxide (iron black, red iron oxide), yellow iron oxide, iron ferrocyanide (dark blue), mixture of dark blue and yellow lead (zinc green), lead oxide (red lead), chromium oxide, Zirconium oxide, a complex of cobalt oxide and aluminum oxide (cobalt blue), a complex of cobalt oxide, tin oxide and magnesium oxide (cerulian blue), a complex of cobalt oxide, lithium oxide and phosphorus pentoxide (cobalt violet), Metal oxides such as cobalt oxide, zinc oxide and magnesium oxide (cobalt green), cobalt phosphate (cobalt violet), manganese phosphate (manganese purple), zinc sulfide and barium sulfate complex (lithopone), Calcium sulfide, strontium sulfide, zinc sulfide, zinc cadmium sulfide, cadmium sulfide Cadmium Yellow), Cadmium Sulfide and Mercury Sulfide Complex (Cadmium Mercury Red), Mercury Sulfide (Silver Vermillion), Cadmium Sulfide and Selenium-Cadmium Complex (Cadmium Red, Cadmium Orange, Cadmium Yellow), Antimony Sulfide and Trioxide Antimony compound (antimony vermilion), such as metal sulfide, barium sulfate, calcium sulfate, lead sulfate,
Metal sulfides such as basic lead sulfate, barium carbonate, calcium carbonate, magnesium carbonate, metal carbonates such as lead carbonate and lead hydroxide composite (lead white), aluminum hydroxide (alumina white), aluminum hydroxide Calcium sulphate complex (satin white), aluminum hydroxide and barium sulphate complex (gloss white), metal hydroxides such as chromic acid hydrate (viridian), lead chromate (yellow lead), zinc chromate Chromate metal salts such as (zinc yellow), barium chromate, lead chromate and lead oxide composite (red lead yellow lead), lead chromate, lead molybdate and lead sulfate composite (chromium vermillion), Complex of lead molybdate and lead sulfate (molybdenum red), mixture of navy blue and yellow lead (chrome green), spinel type (XY2 O4) structure oxide: [Note, XY = Co -Al, Co-Al-Cr, C
o-Mg-Sn, Co-Ni-Ti, Co-Zn-Ni
-Ti, Co-Zn-Cr-Ti, Zn-Cr-Ti,
Zn-Cr-Fe, Co-Zn-Cr-Fe, Co-N
i-Cr-Fe-Si, Co-Mn-Cr-Fe, Cu
-Mn-Cr, Mn-Fe, etc.], rutile type [Ti (X
Y) O2] structure oxide [Note, XY = Pb-Sb, Ni-
Sb (titanium yellow), Ni-W, Fe-Mo, Cr
-Sb], carbon black, titanium black, acetylene black, graphite, silica, white carbon,
Diatomaceous earth, talc, clay, aluminum powder pigment, bronze powder, nickel powder, stainless powder, pearl pigment, etc. are included, and these may be used alone or in accordance with the purpose.
Two or more kinds can be used in combination. The organic pigments are stilbene bisbenzoxazole derivatives such as Clariant's Hostalx KS and Eastman Kodak's OB-1.
Particularly preferred is a type of Hostallux KS series manufactured by Clariant Co., Ltd. of a type in which melting starts at 50 ° C. or higher and melting ends at about 300 ° C. The melting point of polyester itself is 2
60 ° C to 265 ° C, very good mixing and solubility with the fluorescent whitening agent used in the present invention, excellent melt uniformity in the melting machine, good whiteness uniformity and spinning operability. Will be things.

Further, it is preferable that the type containing a methyl group is fixed in the crystalline region of the polyester so that the influence of bleeding in the post-processing is reduced. For example, 4-(-Benzoxazolyl) -4 '-(5-Methyl-2-benzo
xazolyl) stilbene or 4,4-Bis- (5-methyl-2-benzoxazoly
l) stilbene, including 4'4-bis (2-be
nzoxazolyl) Stilbene may be a member of the same family.

The above binder fiber for wallpaper may be mixed with rayon, cotton, polyester fiber or the like, and may be entangled by needle punching or water punching to form a non-woven fabric.

Further, a base paper for wallpaper is laminated on one side of the above-mentioned non-woven fabric alone or a non-woven fabric having a multi-layered structure, adhered and dried. The wallpaper can then be obtained by embossing. Examples will be described below, but the present invention is not limited thereto.

[0018]

Example (bulk recovery rate) A web of 45 g / m ² was made with a card using 100% binder fiber, a flat roller pressure 48 kg / cm, temperature 130 ° C., speed 8 m / min, roll gap 0.3 mm. Non-woven fabric was obtained by thermocompression bonding under the conditions. 10g of this sample is piled up and 3g /
The thickness is measured under a load of m ² (amm / sheet). Next, heat-treat at 130 ° C for 30 seconds under no load and at 25 ° C for 6 seconds.
Measure the thickness after standing for 0 minutes (bmm / sheet) Bulk recovery ratio = b / a

(Eccentricity) In the distance from the center of the core component to the outer circumference, the longest distance is c, the shortest distance is b, and the eccentricity is c / b. The eccentricity was defined as the average value of n = 10 taken by taking a photograph and measuring from a micrograph.
This measurement method is circular and elliptical, and the ratio of the major axis to the minor axis is 1.
Applies to 5 and below.

Intrinsic viscosity (IV): measured using a mixed solvent of phenol / tetrachloroethane = 3/2 (weight ratio).

The melting point of the polyester polymer of the sheath component is measured by a melting point measuring device according to JIS L 1015, 7.16.1.
It measured based on the A method (2000).

(Nonwoven fabric) 100% core-sheath composite fiber
40 at a speed of 130 m / min from a 90 inch wide card
A nonwoven fabric was prepared with a basis weight of g / m ² , and the texture of the surface (smoothness) was visually evaluated. Good (5th grade) to Bad (1st grade)

(Roughness Processability of Nonwoven Fabric) Core-Sheath Composite Fiber 10
0% flat roll with pressure 48kg / cm, temperature 1
A nonwoven fabric for wallpaper was obtained by pressing at 30 ° C., a speed of 8 m / min, and a roll gap of 0.3 mm. Furthermore, 95k
Embossing was performed using a dot type embossing roller under the conditions of g / cm, temperature of 130 ° C., and speed of 5 m / min, and the difference in sharpness between the convex and concave portions was visually determined. The judgment was good (5th grade) to bad (1st grade). In addition, the presence or absence of floating of the concave portion was judged by ◯ ×.

(Example 1) Isophthalic acid (40 mol% as an acid component) terephthalic acid (60 mol% as an acid component) was used as a copolyester of a sheath component, and a melting point of 120 ° C. using ethylene glycol as a diol component,
IV = 0.58, isophthalic acid-modified polyester containing 0.4% by weight of titanium oxide is used as a core component IV =
0.58, polyethylene terephthalate containing 0.6% by weight of titanium oxide was prepared, and after drying each pellet, a nozzle was set by a core-sheath type composite spinning machine so that the eccentricity was 1.2. Composite spinning was performed to obtain an undrawn yarn 1 having a core / sheath ratio of 50/50. Then, draw the undrawn yarn 1 at 800,000 dtex.
And then, after stretching to 2.8 times, the nip pressure 3 kg / cm ² at stuffing box, crimped by a doctor pressure 2 kg / cm ^2, and cut into 6 minutes after drying 51mm at 65 ° C. 2.2 dtex A non-woven fabric binder fiber was obtained.

(Example 2) The above-mentioned undrawn yarn 1 was made into 800,000 dt.
ex after stretching to 2.8 times, stuffing box with nip pressure 2.5 kg / cm ² , doctor pressure 2 kg /
51m after crimping at cm ^{2 and} drying at 65 ° C for 6 minutes
It was cut into m to obtain 2.2 dtex binder fiber for non-woven fabric.

(Comparative Example 1) The same polymer as in Example 1 was used, and the nozzle was set so that the eccentricity was 1.5.
Composite spinning was performed to obtain an undrawn yarn 2 having a core / sheath ratio of 50/50. Then, the undrawn yarn 2 is set to 800,000 dtex and drawn to 2.8 times, and the nip pressure is 3 kg / c in the stuffing box.
crimped at m ² and doctor pressure of 2 kg / cm ² to 65
After drying at 5 ° C for 6 minutes, it was cut into 51 mm to obtain 2.2 dtex non-woven fabric binder fiber.

(Comparative Example 2) The above undrawn yarn 1 was treated with 800,000 dt.
ex to 2.8 times and then tow temperature 55 ° C with indirect steam and nip pressure 2k in stuffing box
Crimping is applied at g / cm ² and a doctor pressure of 1.5 kg / cm ² , dried at 65 ° C. for 6 minutes, and then cut into 51 mm 2.2.
A dtex non-woven fabric binder fiber was obtained.

(Comparative Example 3) 800,000 dt of the above undrawn yarn 1
ex to 2.8 times, then tow temperature is set to 55 ° C with indirect steam, and nip pressure is 4k in the stuffing box.
Crimping is applied at g / cm ² and a doctor pressure of 3.0 kg / cm ² , dried at 65 ° C. for 6 minutes, and then cut into 51 mm 2.2.
A dtex non-woven fabric binder fiber was obtained.

[0029]

[Table 1]

[0030]

EFFECTS OF THE INVENTION According to the present invention, it is possible to obtain a binder fiber for a wallpaper, which is used for a wallpaper using a polyester binder fiber, for making unevenness sharp and reducing unevenness when unevenly processed.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4F055 AA17 EA04 EA16 EA18                 4L041 AA07 AA20 BA22 BA49 BA59                       BD04 BD11 BD20 CA06 CA12                       DD01 DD05 DD15 DD23                 4L047 AA21 AA27 AA29 AB02 AB07                       AB10 BA03 BA04 BA09 CA12                       CC10                 4L055 AF33 AF46 AF47 EA01 EA20                       EA32 FA30 GA23

Claims (8)

[Claims] 1. A polyester fiber having a core-sheath structure, having a crimp number of 9 to 16 / inch, a crimp number / crimp ratio of 0.6 or more, and bulk recovery by the heat treatment described in the text. A binder fiber for wallpaper, which has a ratio of 2.5 or less. 2. The binder fiber for wallpaper according to claim 1, which has an eccentricity of 1.4 or less. 3. The melting point or softening point of the sheath component is lower than the melting point of the core component by 30 ° C. or more, and the weight ratio of the core component / the sheath component is 30.
It is / 70-70 / 30, The binder fiber for wallpaper of Claim 1 or 2 characterized by the above-mentioned. 4. The sheath component contains 25 to 60 mol% of isophthalic acid.
The binder fiber for wallpaper according to any one of claims 1 to 3, wherein the copolymerized polyester and the core component are polyethylene terephthalate. 5. The binder fiber for wallpaper according to claim 1, which has a fineness of 1.1 to 6.6 dtex. 6. The core component contains 0.1 to 5% by weight of the pigment, and the content of the pigment in the sheath portion is less than the content of the core component. Binder fiber for wallpaper according to any of the above. 7. A wallpaper non-woven fabric comprising the binder fiber for wallpaper according to claim 1 in at least a part thereof. 8. A wallpaper comprising the wallpaper non-woven fabric according to claim 7 in at least a part thereof.