JP3435958B2 - Method of manufacturing nap sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a napped sheet for preventing the life of the polishing member from being shortened when raising fibers with an abrasive member such as an abrasive cloth and for forming a uniform napped surface.

[0002]

2. Description of the Related Art As a method for raising a entangled body of fibers or a sheet comprising the entangled body and a polymer elastic body, a method of rotating a polishing cloth at high speed to grind it and raising it is generally used. In this technique, when the fibers have an extremely fine denier, the polishing cloth is clogged rapidly, and there is a problem in that the life of the polishing cloth is reduced and the economy is lowered and the napped property becomes unstable.

Techniques for solving these problems include:
Polishing cloth Reduce the grinding load, use a rounded abrasive, deepen the unevenness of the abrasive, apply metal soap to the surface of the abrasive cloth to reduce the friction coefficient, and mix an antistatic agent into the adhesive The method of doing is mentioned.

However, these methods have some effects in the case of fibers having a certain thickness, but in the case of ultrafine denier, the above problems have not been solved yet. The current situation.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, prevents the life of the polishing member from being shortened, and is effective in a napped sheet having a uniform napped property, particularly in the ultrafine fiber region. It is to provide a method for producing a raised napped sheet.

[0006]

The present inventors have finally arrived at the present invention as a result of intensive studies to solve the above-mentioned problems. The gist of the present invention is as follows.

The above-mentioned object of the present invention is a method for producing a napped sheet by raising at least one surface of a entangled body of fibers or a sheet comprising the entangled body and a polymer elastic material, and mixing inorganic fine particles with the sheet, This is accomplished by a method for producing a napped sheet, which comprises applying a dispersed solution, drying the sheet, and then raising the sheet with an abrasive member.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.

Examples of the entangled body of fibers used in the present invention or the sheet made of the entangled body and the polymeric elastic body include, for example, non-woven fabrics using polyamides, polyesters, polyolefins, acrylonitrile polymers, and the like.
Generally, a woven fabric, a knitted fabric, or a sheet-like product in which a nonwoven fabric and a woven fabric or a knitted fabric are entangled and integrated with each other. There are no particular restrictions on the polymer, fiber cross-sectional shape, sheeting method, and the like.

These sheets can be used alone, but they are further used as a polymeric elastic material such as solvent-based polyurethane, water-based polyurethane resin, acrylic resin, amino acid-based polyurethane resin or the like which are used for artificial leather and the like. It may be a sheet impregnated with or coated with a polymeric elastic body in which chitin, chitosan-based natural protein or the like is mixed.

The thickness of the fiber used here is 0.11 dt.
It is preferably ex or less, and more preferably 0.05 dtex or less. .

In producing a napped sheet using the above-mentioned sheet, the finer the particle mesh of the abrasive material of the abrasive member, the cut fibers are caught in the depressions of the uneven portion of the abrasive material, and the dust removing device such as suction is strengthened. Even if it tried, there was a limit in preventing clogging. Further, the fiber denier forming the fiber entangled body is 0.11 dtex or less, and particularly, 0.
At a dtex of 05 dtex, this tendency was abruptly promoted, resulting in a decrease in the life of the polishing member and a decrease in economic efficiency and instability of the napped property.

The point of the present invention is to grind and raise at least one surface of these sheets by grinding with an abrasive member, after adhering inorganic fine particles to the ground surface.

The point of the present invention is that, before at least one surface of these sheets is ground with sandpaper and raised.
Inorganic fine particles are adhered to the fibers constituting the sheet and the surface of the elastic polymer, and then ground and raised.

The inorganic fine particles used in the present invention include:
Among the oxides, carbonates, silicates and sulfates, water-insoluble ones are preferable. For example, silica, zircon, aluminum oxide, titanium oxide, zinc oxide, iron oxide, calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate, aluminum silicate, magnesium silicate or calcium stearate, metal soaps such as aluminium stearate, kaolinite, Minerals such as zeolite, fluorite, activated clay, and zircon sand are included.
In these categories, silica, magnesium silicate, metal soaps, kaolinite, activated clay are particularly preferably used. These inorganic fine particles are used alone or in combination of two or more.

These inorganic fine particles are used as fibers, polymer elastic bodies,
The inorganic fine particles are mixed and dispersed in a non-solvent. Water is preferable from the viewpoint of handleability and workability. A sheet is impregnated or coated with this solution and dried.

The particle size of the inorganic fine particles is preferably from 0.1 to 70 μm, more preferably from 0.5 to 40 μm, and further preferably from 1 to 20 μm, from the viewpoints of the peeling effect and stabilization of the nap property. .

The amount of the inorganic fine particles adhered to the sheet varies depending on the shape of the sheet, the fiber thickness, the presence or absence of the polymeric elastic body, and the type of the inorganic fine particles, and cannot be unconditionally specified. It is preferably about 0.2 to 30%. If the adhesion amount is too small, the effect of preventing clogging tends to decrease, and if it is too large, unevenness in the grinding efficiency tends to occur partially, and the napped property becomes unstable, making it difficult to control the thickness.

Examples of means for applying the inorganic fine particles to the sheet include a padding method and a coating method, but are not particularly limited. After applying these inorganic fine particles, it may be dried. In drying, it may be preferable to employ drying conditions in which the inorganic fine particles migrate so that the effects of the present invention can be more exerted.

Since these inorganic fine particles are present on the surface of the fiber and the surface of the polymer elastic body, the fine fiber and the polymer elastic body scraped by the buffing by the polishing member catch the frictional heat under high speed rotation and the fiber mixture. It is possible to prevent fusion and bonding due to pressure bonding, and to efficiently promote separation of the polishing member from the surface of the polishing material, to prevent life reduction of the polishing member which is the object of the present invention, and to raise the napped property evenly. The sheet can be manufactured.

[0021]

EXAMPLES The present invention will be described in detail below with reference to examples, but the scope of validity and rights of the present invention is limited thereby.
It is not restricted, but rather brings about the next application and development.

The short fibers shown below were prepared.

(Fiber A) Island component is polyethylene terephthalate, sea component is polystyrene, island / sea ratio = 50/5
0% by weight, 16 islands, staple of polymeric inter-array fibers having an island component denier of about 0.11 dtex after the sea component is dissolved and removed with trichlene.

(Fiber B) Island component is polyethylene terephthalate, sea component is polystyrene, island / sea ratio = 30/7
A staple of sea-island blend type composite fiber having 0% by weight and the thickness of the island component after removal by dissolving the sea component with trichlene is about 0.0055 dtex.

Examples 1 and 2 Fibers A and B were separately passed through a card cloth wrapper to form a web, and needle punching was performed to make felts. Each felt thus obtained was dipped in trichlene and pressed with a mangle. Sea components were dissolved and removed, and hot air drying was performed to prepare desealed felts having a basis weight of about 500 g / m ² .

Next, each of the above felts was impregnated with polyester polyurethane and wet-solidified. afterwards,
A sheet (Example 1) obtained by using fibers A obtained by removing DMF in warm water and drying the fibers and adding polyurethane to an entangled body of ultrafine fiber bundles of polyethylene terephthalate, fibers B
A sheet (Example 2) obtained by using was obtained.

Next, talc (particle size distribution is 1 to 8 μm)
Each sheet is immersed in an aqueous solution in which m) is mixed and dispersed, and squeezed with a mangle so that about 5% of talc adheres,
Then, it was dried with hot air at 100 ° C., and sanding was performed using 320 C / # and 500 C / # as abrasives with the same grinding clearance ratio, suction condition, and processing length. Table 1 shows the results of visual observation and comparison of the state of the residual fibers attached to the surface of each sandpaper after buffing and the napped state.

Comparative Examples 1 and 2 The sheet of Example 1 which was not provided with talc (Comparative Example 1) and the sheet of Example 2 which was not provided with talc (Comparative Example 2) were prepared as Example 1, It grind | raised under the same conditions as 2 and raised.

Table 1 shows the results of visual observation and comparison of the state of the residual fibers attached to the surface of each sandpaper after buffing and the napped state.

[0030]

[Table 1] As is clear from Table 1, when talc is applied to the sheet according to the present invention, the amount of cut fibers attached to the surface of the paper is small, clogging of the uneven portion of the abrasive can be prevented, and reduction of the paper life can be prevented. The effect was particularly remarkable in the ultrafine denier region, and a napped sheet having a stable and uniform napped property could be obtained.

Example 3 and Comparative Example 3 Fiber B was passed through a card / cloth wrapper to form a web, and needle punching was performed to create a felt. The felt obtained was dipped in trichlene and pressed with a mangle to dissolve the sea component. Removed, hot-air dried, then water jet punched and hot-air dried, with a basis weight of about 520 g /
Created m ² felt. (Comparative Example 3) Talc having a particle size distribution of 1 to 8 μm was mixed with water in this felt, immersed in a dispersed solution, and squeezed with a mangle so that about 5% of the solid content per felt was attached, and at 100 ° C. It was dried with hot air. (Example 3) Next, these felts were napped by using sandpaper abrasives of 320 C / # and 500 C / # with the same grinding clearance ratio, suction condition, and anti-processing length.

Table 2 shows the results of visual observation and comparison of the state of residual fibers attached to the surface of each sandpaper after buffing.

[0033]

[Table 2] As is clear from Table 2, when talc was applied to the ground surface of the sheet according to the present invention, the amount of the cut fibers attached to the surface of the paper was small and the reduction of the paper life could be prevented. On the other hand, in the comparative example, paper clogging occurred even if the paper mesh was rough.

Examples 4 to 6 Calcium stearate (with a particle size distribution of 0.5 to 5) was adhered to the sheet prepared in Example 2 at about 7 mg / cm ^2.
8 μm mixed and dispersed solution) was added (Example 4), silicon oxide (particle size distribution of 30-60 μm mixed and dispersed solution) was added (Example 5), calcium carbonate ( A solution to which 0.3 to 8 μm was mixed and dispersed was applied (Example 6) was processed separately, and buffing processing was performed under the same conditions as in Example 1.

As a comparative example, the felt produced in Example 2 was buffed under the same conditions. (Comparative Example 4) Table 3 shows the results of visual observation and comparison of the state of the residual fibers attached to the surface of each sandpaper after buffing and the napped state.

[0036]

[Table 3] As is clear from Table 3, when the inorganic fine particles of the present invention were added, the amount of the cut fibers attached to the paper surface was small, clogging of the uneven portion of the abrasive material could be prevented, and reduction in paper life could be prevented, Moreover, it was possible to obtain a napped sheet having a stable and uniform napped property.

[0037]

As described above, according to the present invention, in producing a entangled body of fibers or a napped sheet composed of the entangled body and a polymer elastic body, the fiber is peeled from the uneven portion of the abrasive or the polymer elastic body such as polyurethane. Peeling is promoted, paper clogging is prevented, and as a result, the life of the polishing member can be prevented from being shortened, and stable nap processing can be performed. The fiber denier forming the fiber entangled body is particularly effective in the ultrafine region.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-1-291922 (JP, A) JP-A-1-250463 (JP, A) JP-A-62-130171 (JP, A) JP-A-7- 268765 (JP, A) JP 56-53283 (JP, A) JP 56-134271 (JP, A) JP 5-247848 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) D06C 11/00

Claims (7)

(57) [Claims] 1. A method for producing a napped sheet by raising at least one surface of a entangled body of fibers or a sheet comprising the entangled body and a polymer elastic material, wherein a solution in which inorganic fine particles are mixed and dispersed is applied to the sheet. Then, after the drying treatment, the sheet is raised with an abrasive member to produce a napped sheet. 2. The inorganic fine particles are oxides, carbonates, silicates,
The method for producing a napped sheet according to claim 1, wherein at least one type of water-insoluble material selected from metal soaps is used. 3. The inorganic fine particles are silica, zircon, aluminum oxide, titanium oxide, zinc oxide, iron oxide, calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate, aluminum silicate, magnesium silicate or calcium stearate, and arsium stearate. The napped sheet according to claim 1, wherein at least one water-insoluble material selected from metal soaps, kaolinite, zeolite, fluorspar, activated clay, and zircon sand minerals is used. Manufacturing method. 4. The method for producing a napped sheet according to claim 1, wherein the inorganic fine particles have a particle diameter of 0.1 to 70 μm. 5. The method for producing a napped sheet according to any one of claims 1 to 4, wherein the amount of the inorganic fine particles attached to the sheet is 0.2 to 30% by weight per sheet. 6. The fiber constituting the fiber entangled body has a thickness of 0.
It is 11 dtex or less, It is characterized by the above-mentioned.
A method for producing a napped sheet according to any one of 1. 7. The method for producing a napped sheet according to claim 1, wherein the solution for mixing and dispersing the inorganic fine particles is water.