JPH0556901A - Polishing sheet and production thereof - Google Patents

Abstract

PURPOSE:To provide the polishing sheet which can easily and sufficiently polish metals, tableware, etc., even without using a polishing agent and the process for production thereof. CONSTITUTION:The polishing sheet 1 is constituted by providing numerous blob-like solids 3 made of a thermoplastic resin on fibers 2 constituting the surface of the sheet. The process for production of the polishing sheet 1 consists in blending and opening conjugate fibers 2 consisting of 1st fibers 1 of a low m.p. and 2nd fibers of a high m.p., and forming a web by a carding machine, then heating the web at a temp. higher than the m.p. of the 1st fibers and lower than the m.p. of the 2nd fibers and forming the blob-like solids 3 while melting and bonding the resin consisting of the 1st fibers on the surface of the 2nd fibers 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commercial or household disposable polishing sheet for polishing metal or tableware.

[0002]

2. Description of the Related Art Conventionally, in order to remove dirt strongly attached to the surface of metal, glass, pottery, plastic, etc., a woven cloth, a nonwoven cloth or a foam material is impregnated with a powder cleanser or a liquid cleanser containing an abrasive. It's scraped off. In order to solve the trouble of impregnating the nonwoven fabric or sponge with the abrasive during the polishing, it has been proposed to adhere the abrasive to the nonwoven by various methods. However, any of these methods has a drawback that the impregnated abrasive is likely to fall off, and the polishing cloth is apt to be clogged unless it is often rinsed with water or the like.

On the other hand, Japanese Patent Application Laid-Open No. 51-1073 discloses a technique in which an abrasive is applied to a mesh to prevent the abrasive from clogging the mesh and deteriorating the polishing effect. Is disclosed. Also, JP-A-56-10
Japanese Patent No. 4634 discloses a technique in which a net-like material is laminated on the surface of a fine fiber layer to trap the abrasive powder in the fine fiber layer so that the abrasive powder does not directly touch the surface to be cleaned or the hand of a cleaner. Has been done.

Incidentally, in the present specification, the polishing powder refers to stains removed by polishing.

[0005]

However, in the former method, since the polishing powder is discharged to the surface to be polished, it is necessary to clean the polishing powder discharged to the surface to be polished.
Since it needs to be wiped off once, there is a problem in that polishing takes time. Further, the latter method has a problem that the inner fine fiber layer only captures the polishing powder and does not discharge the polishing powder to the surface of the polishing cloth, and a sufficient polishing action cannot be obtained.

Therefore, an object of the present invention is to provide a polishing sheet which can easily and sufficiently polish metal, tableware and the like without using an abrasive, and a method for producing the same.

[0007]

According to the present invention, there is provided a polishing sheet characterized in that fibers forming the surface of the sheet are provided with a myriad of solid nodules made of a thermoplastic resin. It has achieved its purpose. In addition, the present invention provides, as a preferred method for producing the above-mentioned polishing sheet, after blending a composite fiber composed of a first fiber having a low melting point and a second fiber having a high melting point and forming a web by a card machine. ,
Characterized by heating at a temperature higher than the melting point of the first fiber and lower than the melting point of the second fiber to melt-bond the resin comprising the first fiber to the surface of the second fiber and form a bump-shaped solid. The present invention provides a method for manufacturing a polishing sheet.

The present invention will be described below in detail with reference to the accompanying drawings. 1 is a perspective view showing a part of the polishing sheet of the present invention by cutting away, FIG. 2 is an enlarged view of the polishing sheet shown in FIG. 1, and FIG. 3 is a manufacturing process of the polishing sheet shown in FIG. FIG. 5 is a diagram schematically showing the method, FIG. 4 is a perspective view showing a state of fibers before heat treatment of the fibrous web of the polishing sheet of the present invention, and FIG. 5 is an enlarged view of the fiber state shown in FIG. 4. FIG.

The polishing sheet 1 according to the present invention is characterized in that the fibers 2 constituting the surface of the sheet are provided with innumerable bump-shaped solids 3 made of a thermoplastic resin. Such polishing sheet 1
Is manufactured as follows, as shown in FIG. At least a first fiber made of a thermoplastic resin (A) having a melting point equal to or higher than the heating temperature and a second fiber made of a thermoplastic resin (B) having a melting point lower than the heating temperature are mixed by a cotton mixing machine 5 to form a card machine. After being formed into a web by No. 7, by heating with a heater 9, the thermoplastic resin (B) of the second fiber is melted on the thermoplastic resin (A) of the first fiber to form a bump shape. It is formed to give unevenness to the fiber.

Further, the non-thermoplastic fiber (C) and the second fiber comprising the thermoplastic resin (B) having a melting point below the temperature at which the non-thermoplastic fiber (C) is thermally decomposed are mixed, and a card machine is prepared. After being formed into a web by No. 5, the non-thermoplastic fiber (C) is melted with the thermoplastic resin (B) by heat treatment by the heater 9 to give bump-shaped irregularities. Further, the card machine 7 is a composite fiber obtained by composite spinning of a thermoplastic resin (A) having a melting point equal to or higher than the heating temperature and a thermoplastic resin (B) having a melting point equal to or lower than the heating temperature into a core-sheath type or a parallel type.
After being formed into a web by means of the above, the fiber component (B) may be melted on the fiber component (A) by heating it with the heater 9 to give the thermoplastic resin (A) bump-like irregularities.

The thermoplastic fiber or the composite fiber made of a thermoplastic resin used in the polishing sheet of the present invention includes polyolefins such as polyethylene, polypropylene and polybutene, polyesters such as polyethylene terephthalate and polybutylene terephthalate.
Vinyl type, vinylidene type, for example, polyvinyl chloride, polyvinylidene chloride, etc., amide type such as nylon, and acrylic type or modified products thereof, alloys, thermoplastic resins such as blends, and non-thermoplastic fibers include rayon,
Cupra, cotton, linen, etc. are used. Further, when a polishing sheet is obtained by combining thermoplastic fibers with each other, a clear difference in melting point is required.

On the other hand, when non-thermoplastic fibers are used as a part of the polishing sheet, it is necessary to select thermoplastic fibers having a melting point below the temperature at which the fibers are thermally decomposed (carbonized). Further, the lump-like shape formed on the high-melting-point fiber or the non-thermoplastic fiber depending on the proportion of the low-melting thermoplastic fiber or the thermoplastic fiber component that melts when heated to form bump-like irregularities Since it affects the number or size of the irregularities, the ratio is appropriately selected according to the polishing ability to be developed.

Using the present invention as a household polishing sheet,
When it is used for cleaning a sink or a microwave oven, the content of low melting point fibers or its components that become bumpy unevenness by heat treatment is 30
~ 95 wt% is preferred, more preferably 60-80 wt%
Is. If the proportion of the low-melting-point fibers that become bumpy unevenness due to the heat treatment is larger than 95 wt%, the fibers are strongly bonded to each other and bumpy unevenness is hard to be formed.
This is because the holding property is deteriorated, and when it is less than 30 wt%, bump-like irregularities are reduced or reduced, and the polishing ability is deteriorated.

On the other hand, when only the core-sheath type or parallel type composite fibers are used, if the low melting point fiber component is increased in order to increase or increase the bump-shaped irregularities while maintaining the fiber diameter of the high melting point fiber, the composite fiber diameter becomes large. Since it becomes thicker and the processability when making it into a fibrous web becomes worse, by blending resin fibers having the same or high compatibility with the low melting point component so that the low melting point component has a predetermined amount, It is possible to control the amount or size of the irregularities. Further, in order to improve the polishing ability or rigidity of the polishing sheet, even when the fiber diameter of the high-melting point fiber is increased, by mixing the resin fiber having the same or high compatibility with the low-melting point component, the workability is improved. It is possible to obtain a good fiber diameter.

The non-woven web for capturing the abrasive powder is partially adhered or fused by a thermoplastic resin which forms bump-like irregularities. As a method for forming a non-woven web, after forming a fibrous web by a commonly used conventional card, heat treatment at a melting point of the low-melting point component or more and a melting point of the high-melting point component or less makes the low-melting point component high. A fiber having a melting point component is formed with bump-shaped irregularities, and the fibers are fused or adhered to each other to form a nonwoven web. At this time, the distance between the fibers forming the nonwoven web affects the entanglement retention of dirt and the fibers. Therefore, the degree of the inter-fiber distance is determined by comprehensively considering the polishing ability, the dirt trapping and retaining ability, etc., but 30 to 500 μ is suitable.

The fiber distance a (m) is calculated by the following equation. a = (DV / 9000w) ^1/2 D: Fineness (d) V: Nonwoven fabric volume (m ³ ) w: Nonwoven fabric weight (g) If it is less than 30 μ, it can be held between fibers if the interfiber distance becomes too small. The amount of dirt is reduced and the dirt retention is deteriorated. If it is larger than 500 μm, the distance between the fibers becomes too large, the strength of the nonwoven fabric is remarkably lowered, and the polishing ability of dirt and the like are apt to be lowered and dropped. The strength of this non-woven web also changes depending on the type, physical properties, basis weight, etc. of the constituent fibers.

The basis weight is also the polishing ability, dirt retention, strength,
Although it may be determined in consideration of workability, cost, etc., when the present invention is used as a household polishing sheet for cleaning a sink, a range, etc., 10 to 150 g / m ² is appropriate.
If the basis weight is less than 10 g / m ² , necessary and sufficient polishing ability,
This is because it is difficult to give strength, and if it exceeds 150 g / m ^2, it is disadvantageous in terms of cost.

Although the fineness also affects the polishing ability, the fineness of the high melting point fiber or the non-thermoplastic fiber which remains as a fiber after the heat treatment is preferably 1 to 15 denier. If it is thinner than 1 denier, the strength as a sheet becomes extremely poor. The base cloth may contain a surfactant or an oil agent in order to facilitate the removal of dirt adhering to the solid surface. Further, the polishing effect can be controlled by selecting the hardness.

When used as a household polishing sheet for a sink, a microwave oven, etc., the hardness of the fibers used in the nonwoven web is the Rockwell hardness test (JIS Z 2245).
In, it is preferable to use a resin of R50 or more and M130 or less. An abrasive may be applied to the nonwoven web depending on the object to be polished. At this time, the polishing agent may be any of those used in conventionally known polishing compositions.
At that time, the polishing agent includes all those used in conventionally known polishing compositions, for example, aluminum oxide, calcium carbonate, iron oxide, keiseki, zeolite,
Examples include feldspar, talc, quartz, phospholime, yellow stone, garnet, fused zirconia, silicon carbide and boron carbide. Also,
Thermosetting resin to bond the abrasive to the nonwoven web,
It is also possible to use a binder obtained by dissolving a thermoplastic resin in a solvent, a commercially available adhesive, or the like by a spray method, a dipping method, or the like. However, it is necessary to properly select the abrasive and the particle size depending on the object.

According to another aspect of the present invention, there is provided a method for producing a polishing sheet in which a composite fiber composed of a first fiber having a low melting point and a second fiber having a high melting point is mixed and a web is formed by a card machine. Characterized by heating at a temperature higher than the melting point of the first fiber and lower than the melting point of the second fiber to melt-bond the resin comprising the first fiber to the surface of the second fiber and form a bump-shaped solid. And

More specifically, two or more types of thermoplastic fibers having different melting points, or a part of non-thermoplastic fibers and thermoplastic fibers are mixed and formed into a web by the card machine 7,
The low melting point component is melted by heat treatment with the heater 9 to form bump-shaped irregularities made of the low melting point fiber component (or the thermoplastic fiber component) on the high melting point fiber (or the non-thermoplastic fiber).

Alternatively, by heat-treating a composite fiber composed of two or more kinds of components having different melting points, or by mixing a thermoplastic fiber composed of a low-melting point component of the composite fiber with the above-mentioned composite fiber and then heat-treating it. Alternatively, the low-melting point component may be melted to form bump-like irregularities made of the low-melting point component on the high-melting point fiber. Further, using a core-sheath fiber, a thermoplastic fiber having the same quality as the sheath component of the fiber is mixed by a conventional method, and a card machine 7 is used to form a fiber web.
By heating at a temperature not lower than the melting point of the thermoplastic resin of the sheath portion of the core-sheath fiber and the fiber of the same quality as the resin and lower than the melting point of the core portion of the core-sheath structure, the sheath portion of the core-sheath structure and the same When the resin melts and adheres in the form of drops, bump-shaped irregularities can be provided. After that, in the case of a continuous sheet, it may be wound into a roll, or may be cut into a required length and folded and packaged as necessary.

[0023]

[Function] Contamination irregularities in the fiber surface layer scrub off dirt that has clinged to it, and then scummed off (polishing powder)
Are held in the entanglement with the fibers of the bulky nonwoven web. Further, since the fiber sheet is used, the sheet as a whole is bulky, so that it is highly effective in collecting dirt and dust between the constituent fibers of the sheet, and the clogging of the polished portion can be minimized.

[0024]

Embodiments of the present invention will now be described in detail with reference to the drawings. In the polishing sheet 1 according to the embodiment of the present invention, numerous bump-shaped solids 3 are fused to the fibers 2 constituting the sheet surface. The fibers constituting the surface are in the form of a bulky fibrous web and trap the abrasive powder between the fibers.

Next, one embodiment of the method for manufacturing the polishing sheet according to this embodiment will be described. As shown in FIG. 3, the first fiber having a low melting point and the second fiber having a high melting point are mixed by a mixing machine 5 and fed to a card machine 7 by a feeding device 6, where a web is formed. The web is sent to the heating device 9 via the feeding device 8 and subjected to heat treatment. In this heating device 9, heating is performed at a temperature between the melting point of the first fiber and the melting point of the second fiber, and only the first fiber having a low melting point is melted to form a bump on the second fiber. It sticks. Then, when the web exits the heating device 9, the temperature applied to the fibers is lowered, and the fibers melted in a lump shape are solidified to form a lump-shaped solid 3.

The web is further conveyed and wound around the winder 11 as the sheet roll 12 through the nip roll 10 to obtain the polishing sheet 1 as shown in FIG. Example 1 Polypropylene / polyethylene (core-sheath) fiber 6 denier (polyethylene 50 wt%), 51 mm and polyethylene fiber 3 denier of the same quality as the sheath polyethylene, 51 mm 50 /
After blending at a ratio of 50, a web was formed using a conventional card (basis weight: 100 g / m ² ) to obtain a fibrous web. After that, heat treatment (condition: 150 ° C x 15 seconds) is performed, 20 cm x 2
It was cut to 0 cm to obtain a polishing sheet having bump-shaped irregularities as shown in FIGS. 1 and 2.

Example 2 Polyester / polypropylene (core-sheath) fiber 6 denier (polypropylene 50 wt%), 51 mm and polypropylene fiber of the same quality as the sheath polypropylene 3 denier, 51 mm were mixed at a weight ratio of 50/50 and a conventional card To form a web (basis weight: 100 g / m ² ) to obtain a fibrous web. After that, heat treatment (condition: 185 ° C x 15 seconds) is performed, and 20 cm x
It was cut into 20 cm to obtain a polishing sheet having bump-shaped irregularities as shown in FIGS. 1 and 2.

Example 3 A polyester / polypropylene (core-sheath) fiber having a denier of 10 denier (75 wt% polypropylene) and 51 mm was formed into a web by a conventional card (basis weight: 100 g / m ² ) to obtain a fibrous web. After that, heat treatment (condition: 185 ° C. × 15 seconds) was performed, and cut into 20 cm × 20 cm to obtain a polishing sheet having bump-shaped irregularities as shown in FIGS. 1 and 2.

Comparative Example 1 Polypropylene / polyethylene (core-sheath) 6 denier (polyethylene 50 wt%), 51 mm was used to form a web (basic weight 100 g / m ² ) using a conventional card to obtain a fibrous web.
After that, heat treatment (condition: 130 ° C x 15 seconds) is performed and
The sheet was cut into cm × 20 cm to obtain a sheet without bump-like irregularities.

Comparative Example 2 Polyester / polypropylene (core-sheath) fiber 6 denier (polypropylene 50 wt%), 51 mm was used to form a web with a conventional card (basis weight 100 g / m ² ) to obtain a fibrous web. After that, heat treatment (condition: 165 ° C. × 15 seconds) was performed and cut into 20 cm × 20 cm to obtain a sheet having no bumpy unevenness.

Polishing Test The following stains were made, and the sheets of the above-mentioned Examples and Comparative Examples were tested for polishing ability and the like. Dirt 0.03 g of a rapeseed oil / carbon black (weight ratio: 5/1) mixture was applied to an iron (3 cm x 8 cm) test piece, and a weakly modified stain (pencil hardness 5B) was denatured at 150 ° C for 30 minutes. Made and evaluated.

[0032]

[Table 1] The results of the ability to capture the polishing powder are included in the item of capturing secularity.

×: problematic level ○: almost no problem level Δ: problematic level remains ◎: no problematic level As apparent from this table, according to this example, according to this example, compared with the comparative example. It is extremely excellent in polishing effect, has no problems in terms of clogging and trapping property, can easily and sufficiently remove dirt without using an abrasive, and has excellent performance as a polishing sheet. I understand.

[0034]

According to the polishing sheet of the present invention, a metal or the like can be easily and sufficiently polished without using an abrasive. Furthermore, by mainly polishing the dirt adhering to the fixed surface with bump-shaped irregularities on the fiber surface, and capturing the dirt that has been polished by the fibers that make up the nonwoven web,
It is possible to clean a wide range of stains that conventional polishing sheets do not have.

Further, since the polishing sheet of the present invention is a fibrous sheet, it has improved cushioning properties as a bulky sheet, and since it has a high ability to retain the polishing powder that has removed the adhered dirt, it has a high polishing ability. No need to wash or wipe twice. According to the method for manufacturing a polishing sheet of the present invention, a uniform polishing sheet can be manufactured stably at high speed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a polishing sheet according to the present invention by cutting out a part thereof.

FIG. 2 is an enlarged view of the polishing sheet shown in FIG.

FIG. 3 is a diagram schematically showing a method for manufacturing the polishing sheet shown in FIG.

FIG. 4 is a perspective view showing the state of fibers before heat treatment of the fibrous web of the polishing sheet of the present invention.

5 is an enlarged view showing the fiber state shown in FIG. 4. FIG.

[Explanation of symbols]

 1 Polishing Sheet 2 Fiber 3 Solid Solid 5 Blending Machine 7 Card Machine 9 Heat Treatment Device

Claims (6)

[Claims] 1. A polishing sheet, characterized in that countless solid bumps made of a thermoplastic resin are provided on fibers constituting the surface of the sheet. 2. The fiber constituting the surface of the sheet has a melting point higher than that of a thermoplastic resin forming a bumpy solid, and the bumpy solid is melted and fixed to the fiber. The polishing sheet according to claim 1, wherein 3. The polishing sheet according to claim 1, wherein the fibers constituting the sheet are a mixture of thermoplastic fibers and non-thermoplastic fibers. 4. A composite fiber composed of a first fiber having a low melting point and a second fiber having a high melting point is mixed and formed into a web by a carding machine, and then a second fiber having a melting point higher than the melting point of the first fiber. A method for producing a polishing sheet, which comprises heating at a temperature lower than the melting point to form a bump-like solid while melt-adhering the resin made of the first fiber to the surface of the second fiber. 5. The method for producing a polishing sheet according to claim 4, wherein the web is formed by mixing the composite fibers with the first fibers. 6. The method for producing a polishing sheet according to claim 4, wherein the web is formed by mixing thermoplastic fibers and non-thermoplastic fibers.