JP3435957B2 - 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 fiber becomes extremely fine denier, the polishing cloth is rapidly clogged, and there is a problem in that the economy of the polishing cloth is shortened 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. Method etc. are mentioned.

[0004] However, although these methods show some effects in the case of fibers having a certain thickness, in the case of ultrafine denier, the above problems have not yet been solved. Is.

[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 produces a napped sheet having a uniform napped property. It is an object of the present invention to provide a method for producing a napped sheet that is effective in the fiber area.

[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 body, in which inorganic fine particles are attached to the sheet. After that, this is achieved by a method for producing a napped sheet, which comprises raising the sheet with an abrasive member.

[0008]

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

As the entangled body of fibers or the sheet composed of the entangled body and the polymer elastic body used in the present invention, natural leather, polyamides, polyesters, polyolefins, acrylonitrile polymers, etc. are used. Generally, a non-woven fabric, a woven fabric, a knitted fabric, or a sheet-shaped product in which a non-woven fabric and a woven fabric or a knitted fabric are entangled and integrated. 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 inorganic fine particles used in the present invention include:
Oxides, carbonates, silicates and sulfates are used. 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,
Minerals such as kaolinite, zeolite, fluorspar, activated clay, and zircon sand are included. Of these, silica, magnesium silicate, metal soaps, kaolinite, and activated clay are particularly preferably used. These inorganic fine particles are used alone or in combination of two or more.

The particle size of these inorganic fine particles is preferably 0.1 to 70 μm, more preferably 0.5 to 40 μm, from the viewpoint of the peeling effect and the stabilizing point of the nap property.
More preferably, it is 1 to 20 μm.

The amount of these inorganic particles attached to the ground surface is
The shape of the seat, there is a difference depending on the type of presence and inorganic fine particles of fiber thickness and elastic polymer categorically is not be specified, preferably 0.2~25mg / cm ² approximately as a guide. 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.

As a means for applying the inorganic fine particles to the surface of the sheet to be ground, for example, at the entrance of the polishing cloth buffing device, an appropriate amount of the inorganic fine particles is continuously adhered to the gap or the surface of the rotating brush or the sponge roller. A method of applying a certain amount to the sheet surface, a method of dropping a certain amount by vibrating method by gravity, or a method of scraping the sheet into inorganic fine particles and then scraping the surface with a doctor knife, fluidized inorganic fine particles There are various methods such as passing through particles, but these methods are not particularly limited.

The presence of these inorganic fine particles on the surface of the fiber and the surface of the polymer elastic body allows the fine fiber and the polymer elastic body, which have been buffed and caught by the polishing member, to generate frictional heat under high-speed rotation and to be mixed with each other. It is possible to prevent fusion and bonding due to pressure bonding, and to efficiently promote the peeling of the polishing member from the surface of the polishing material, to prevent the life of the polishing member, which is the object of the present invention, from being reduced, and to have a uniform raised fiber sheet. It is possible to manufacture.

[0019]

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
Staples of polymer mutual array fibers having 0% by weight, 3 islands, and a thickness of 0.55 dtex after the sea component is dissolved and removed with trichlene.

(Fiber B) The island component is polyethylene terephthalate, the sea component is polystyrene, and the island / sea ratio is 50/5.
A staple of polymer inter-array fibers having 0% by weight, 16 islands, and a thickness of 0.11 dtex of the island component after the sea component is dissolved and removed with trichlene.

(Fiber C) Island component is polyethylene terephthalate, sea component is polystyrene, island / sea ratio = 50/5
Staples of polymer inter-array fibers having 0% by weight, 145 islands, and a thickness of 0.011 dtex of the island component after the sea component is dissolved and removed with trichlene.

Examples 1 to 3 Fibers A to C 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. A sea component was dissolved and removed, hot air drying was performed, and a felt obtained by using a fiber A having a basis weight of about 500 g / m ² (Example 1) and a felt obtained by using a fiber B (Example 2) ), And the felt (Example 3) obtained using the fiber C was created.

Then, the polyester type polyurethane was impregnated into the felt and wet-solidified. Then DM in warm water
F was removed and dried to obtain a sheet in which polyurethane was applied to an entangled body of ultrafine fiber bundles of polyethylene terephthalate.

Then, a talc having a particle size distribution of 1 to 8 μm is about 0.5 mg / cm on each felt surface by a sandpaper buffing device equipped with a device for continuously adhering talc to a rotating brush made of nylon. ² Adhesion is set, and the adhesion surface is sandpaper abrasive 320C
/ # And 500C / # were used, and the brushing treatment was performed 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 raised state of the sheet.

Comparative Examples 1 to 3 The felts obtained in Examples 1 to 3 were ground and napped under the same conditions as in Examples 1 to 3 without adding talc. Felt obtained using fiber A (Comparative Example 1),
Felt obtained using Fiber B (Comparative Example 2), Fiber C
Felt obtained by using (Comparative Example 3).

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

[0030]

[Table 1] As is clear from Table 1, when talc is applied to the ground surface of the sheet according to the present invention, the amount of the cut fibers attached to the paper surface is small, clogging of the uneven portion of the abrasive is prevented, and the paper life is shortened. It was possible to prevent the above, and its effect was remarkable especially in the ultrafine region, and it was possible to obtain a napped sheet having a stable and uniform napped property.

Example 4 Fiber C was passed through a card / cloth wrapper to form a web, and needle punching was performed to create a felt. The felt was dipped in trichlene, squeezed with a mangle to dissolve and remove sea components, and hot air was blown. It is dried and then water jet punched to dry it with hot air.
Created m ² felt. Then, using a sandpaper buffing device equipped with a device for continuously attaching talc to a rotating brush made of nylon, it was set so that about 1 mg / cm ² of talc having a particle size distribution of 1 to 8 μm was attached to the felt surface. , The adherend is sandpaper abrasive 3
20C / # and 500C / # were used, and the brushing treatment was carried out with the same grinding clearance ratio, suction condition, and opposite processing length.

Comparative Example 4 As a comparative example, the water jet punching of Example 4 was performed, hot air drying was performed, and buffing processing was performed under the same conditions as in Example 4 using a felt having a basis weight of about 520 g / m ² .

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.

[0034]

[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 cut fibers attached to the paper surface was small, and the reduction of sandpaper life could be prevented. On the other hand, in the comparative example, paper clogging occurred even if the paper mesh was rough.

Examples 5 to 7 About 1 mg / cm ^{2 was} attached to the felt surface prepared in Example 3 by a sandpaper buffing device equipped with a device for continuously adhering fine particles with a nylon rotating brush. To which calcium stearate (particle size distribution: 0.5 to 8 μm) was added (Example 5), silicon oxide (particle size distribution: 30 to 60 μm) (Example 6), calcium carbonate (0 3 to 8 μm) (Example 7) was separately processed, and buffing processing was performed under the same conditions as in Example 3. As a comparative example, the felt produced in Example 3 was buffed under the same conditions. (Comparative Example 5) Table 3 shows the results of visual observation and comparison of the state of residual fibers attached to the surface of each sandpaper after buffing.

[0036]

[Table 3] As is clear from Table 3, the sheet according to the present invention in which the inorganic fine particles are added to the ground surface has less clogging of the abrasive surface of the paper surface, can prevent the sandpaper life from decreasing, and is stable and uniform. It was possible to obtain a napped sheet having a napped property.

[0037]

As described above, according to the present invention, in producing a entangled body of fibers or a napped sheet comprising the entangled body and a polymer elastic body, the fibers are peeled from the abrasive portion or the polymer elastic body such as polyurethane is used. The peeling is promoted, the clogging of the polishing member is prevented, and as a result, the life of the polishing member is prevented from being shortened, and stable nap processing is possible. 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 (6)

(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 body, wherein inorganic fine particles are adhered to the sheet, and then the sheet is formed. A method for producing a napped sheet, which comprises raising with an abrasive member. 2. The inorganic fine particles are oxides, carbonates, silicates,
The method for producing a napped sheet according to claim 1, wherein at least one kind of metal soap 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 method for producing a napped sheet according to claim 1, wherein at least one of metal soaps, kaolinite, zeolite, fluorspar, activated clay, and zircon sand minerals is used. 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 amount of inorganic fine particles deposited is 0.2 to 25 mg.
/ Cm < ² >, The method for manufacturing a napped sheet according to any one of claims 1 to 4, wherein 6. The fiber constituting the fiber entangled body has a thickness of 0.1.
It is 1 dtex or less, The manufacturing method of the napped sheet in any one of Claims 1-5 characterized by the above-mentioned.