JP3628318B2 - Nonwoven polishing sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a nonwoven fabric polishing sheet that is gripped by hand and polishes an object to be polished.
[0002]
[Prior art]
Nonwoven polishing sheets of a size that can be grasped and used by hand are often used for various purposes. For example, it is used for rust removal of metal surfaces and surface treatment. Since the nonwoven fabric polishing sheet has a cushioning property, it can be used particularly conveniently for polishing uneven objects. This non-woven fabric abrasive sheet is produced by gathering fibers so as not to have a three-dimensional orientation to form a non-woven fabric, and attaching abrasive grains to the gaps between the fibers of the obtained non-woven fabric. A non-woven fabric is manufactured by dropping fibers cut to a predetermined length onto a moving belt without directionality, gathering them to a predetermined thickness, and bonding the intersections of these fibers. Furthermore, it is manufactured by attaching abrasive grains to a nonwoven fabric, pressing it to a predetermined thickness, and then cutting it into a predetermined size.
[0003]
[Problems to be solved by the invention]
The nonwoven fabric polishing sheet manufactured as described above is gripped by hand and polished by pressing the surface against the object to be polished. Although the object to be polished can be polished in this state, it is difficult to efficiently polish the surface of the object to be polished having unevenness, particularly the concave portion. Since the nonwoven fabric polishing sheet has cushioning properties, it can be polished by pressing against the concave portion by hand, but it is difficult to polish small concave portions and deep concave portions to the inside. The recess can be efficiently polished with a brush. However, it is difficult to polish the plane efficiently and cleanly with a brush. In addition, since the brush is produced by planting countless hairs in the same direction on the base, the manufacturing cost increases. Moreover, since the hair of the thickness which can be planted on a base and can become independent is used, if many thin and long hairs are planted, it will take time and manufacturing cost will become high.
[0004]
The present invention has been developed for the purpose of solving such drawbacks. An important object of the present invention is to provide a nonwoven fabric polishing sheet that can be gripped by hand and can efficiently polish both a polished surface having a small recess and a smooth polished surface.
[0005]
[Means for Solving the Problems]
The nonwoven fabric polishing sheet of the present invention is a three-dimensionally assembled fiber and bonded at intersections to a thickness of 3 to 20 mm, and abrasive particles are attached to the voids of the fiber from the surface toward the inside. In addition, it is cut to a size that can be polished by holding it with a hand and has a flexibility. Furthermore, the nonwoven fabric polishing sheet is provided with a plurality of notch lines 2 arranged in a straight line at a predetermined pitch so as to penetrate the surface or both surfaces. The nonwoven fabric polishing sheet is folded back using the notch line 2 as a fold so that the object to be polished can be polished by the cut surface 3 of the notch line 2 exposed on the fold.
[0006]
The nonwoven fabric abrasive sheet of the present invention can be provided with a plurality of notch lines 2 in parallel. The length (W) of one notch line 2 can be 3 to 30 mm. The interval (d) between the notch line 2 and the adjacent notch line 2 can be 1/10 to 10 times the length (W) of the notch line 2. Furthermore, the whole size of the nonwoven fabric polishing sheet can be 25 to 5000 cm ² .
[0007]
Furthermore, the nonwoven fabric abrasive sheet of the present invention can have a rectangular shape as a whole. This nonwoven fabric abrasive sheet can be provided in the center of the long side which opposes, and can provide the notch line 2 in parallel with a short side. Furthermore, the nonwoven fabric polishing sheet having an overall shape of a quadrangle can be provided at the center of the long side and the short side so that the cut line 2 is orthogonal to the short side and the long side. Furthermore, the whole thickness of the nonwoven fabric polishing sheet can be 5 to 15 mm.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. However, the Example shown below illustrates the nonwoven fabric polishing sheet for materializing the technical idea of this invention, and this invention does not specify a nonwoven fabric polishing sheet to the following.
[0009]
Further, in this specification, in order to facilitate understanding of the scope of claims, the numbers corresponding to the members shown in the embodiments are referred to as “claims” and “means for solving the problems”. It is added to the member shown by. However, the members shown in the claims are not limited to the members in the embodiments.
[0010]
The nonwoven fabric polishing sheet 1 shown in FIG. 1 aggregates the fibers three-dimensionally and binds them at their intersections to a thickness of 3 to 20 mm. The nonwoven fabric polishing sheet 1 has abrasive grains adhering to the inside of the fiber from the surface toward the inside. The abrasive grains are uniformly attached from the surface to the inside, or attached to the surface at a higher concentration than the inside. The nonwoven fabric polishing sheet 1 having abrasive grains uniformly adhered to the inside is manufactured by immersing the nonwoven fabric in a binder liquid kneading the abrasive grains, squeezing out excess binder, and then drying the binder. The nonwoven fabric polishing sheet 1 having a high concentration of abrasive particles on the surface is immersed in the binder and then the excess binder is squeezed out or adhered to the nonwoven fabric by spraying the binder from the surface. It is manufactured by spraying from the surface toward the inside. Moreover, the binder which knead | mixed the abrasive grain can be sprayed on the nonwoven fabric toward the inside from the surface, and an abrasive grain can adhere to the surface at a higher concentration than the inside.
[0011]
The nonwoven fabric polishing sheet of the present invention is sized so that it can be grasped by hand and the object to be polished can be polished. The nonwoven fabric polishing sheet 1 is manufactured by attaching abrasive grains to a nonwoven fabric and curing the binder, and then cutting the nonwoven fabric into a size that can be used with a hand. Nonwoven abrasive sheet 1 that can be used by grasping by hand, 25～5000Cm ² the overall size, preferably 100～1000Cm ^2, further preferably 200~500cm ^2. The nonwoven fabric polishing sheet 1 shown in the figure has an overall shape of a quadrangle and the size is as described above. The nonwoven fabric polishing sheet does not necessarily have to be a quadrangle as a whole, and can also have various shapes such as a polygon, an ellipse, a circle, or a heart shape.
[0012]
The nonwoven fabric polishing sheet 1 is cut into a predetermined shape by cutting fibers. Therefore, the outer peripheral surface of the nonwoven fabric polishing sheet 1 has an infinite number of cut ends of the cut fibers. In other words, the outer peripheral surface of the nonwoven fabric abrasive sheet 1 becomes the cut surface 3 of the fiber. The outer peripheral surface that becomes the cut surface 3 of the fiber is such that the ends of a large number of cut fibers are exposed like the tip of the brush, so that the object to be polished having unevenness can be efficiently polished more efficiently than both surfaces. .
[0013]
The nonwoven fabric polishing sheet 1 is flexible enough to be bent by hand. This is because it is used after being folded. If the nonwoven fabric polishing sheet 1 is too hard, it cannot be used because it is folded. Therefore, the flexibility of the nonwoven fabric polishing sheet 1 is set so that it can be bent. The flexibility, that is, the hardness of the nonwoven fabric polishing sheet 1 is adjusted by the hardness of the binder to which abrasive grains are attached, the amount of binder used, the hardness of the nonwoven fabric itself, and the degree to which the nonwoven fabric is pressed before the binder is cured. it can. Furthermore, since the flexibility changes even with the entire thickness, the thickness of the nonwoven fabric abrasive sheet 1 is made thinner than 20 mm, preferably thinner than 15 mm, more preferably thinner than 10 mm. However, if the nonwoven fabric polishing sheet 1 is too thin, it cannot be efficiently polished at the cut surface 3 of the notch line 2, so that it is thicker than 3 mm, preferably thicker than 5 mm.
[0014]
As a binder for adhering abrasive grains to a nonwoven fabric, a material having excellent heat resistance is suitable. For example, an adhesive material such as a phenol resin, an epoxy resin, a silicon resin, or a urethane resin can be used. The kind and application amount of the binder adjust the flexibility and stretchability of the nonwoven fabric abrasive sheet 1. When the application amount of the hard-curing binder is increased, the nonwoven fabric polishing sheet 1 becomes hard and less flexible, and cushioning properties are also reduced. On the other hand, if a flexible binder is used, or if the amount of the binder applied is reduced, it becomes flexible and easily bends. A phenol resin or epoxy resin adhesive can be used as the hard binder, and a silicon resin or urethane resin adhesive can be used as the flexible binder.
[0015]
The nonwoven fabric polishing sheet 1 is provided with a plurality of notch lines 2 arranged in a straight line at a predetermined pitch so as to penetrate the surface or both surfaces. The notch line 2 is folded back as a crease so that the object to be polished can be polished by the cut surface 3 of the notch line 2 exposed on the crease.
[0016]
The notch line 2 is provided through both surfaces as shown in the cross-sectional view of FIG. 2, or is provided on the surface without penetrating as shown in FIGS. The nonwoven fabric polishing sheet 1 in FIG. 3 is provided with a notch line 2 on one side, and the nonwoven fabric polishing sheet 1 in FIG. 4 is provided with a notch line 2 at a position facing both sides. The notch line 2 has a length (W) of 3 to 30 mm, preferably 5 to 20 mm. If the cut line 2 is too short, it becomes difficult to efficiently polish the object to be polished by the cut surface 3 of the cut line 2. On the other hand, if it is too long, both sides of the notch line 2 cannot be firmly connected. The interval (d) between the notch line 2 and the adjacent notch line 2 is 1/10 to 10 times, preferably 1/5 to 2 times, more preferably 1/3 to 1 times the length (W) of the notch line 2. Double. If the interval (d) between the notch lines 2 is too long, the cut surface 3 of the notch line 2 will be shortened. If it is too short, both sides of the notch line 2 cannot be firmly connected.
[0017]
The state where the nonwoven fabric polishing sheet 1 is bent at the notch line 2 is shown in FIGS. As shown in these figures, when the nonwoven fabric polishing sheet 1 is folded back with the notch line 2 as a crease, the cut surface 3 of the notch line 2 is exposed at the fold, and the boundary between the cut surface 3 and the surface protrudes from the peak. 4 The protruding peaks 4 are provided so as to face the folding surface in two rows as shown in the figure. The opposing two rows of protruding peaks 4 have a fiber cutting surface 3 with high polishing efficiency on the inside. Since the protruding peak 4 of this structure protrudes with a structure that can be efficiently polished, the concave portion of the object to be polished can be polished particularly efficiently. Furthermore, since the nonwoven fabric polishing sheet 1 is provided with the notch lines 2 at a predetermined pitch, the protruding peaks 4 are also provided at a predetermined pitch. The connecting portion 5 between the protruding peaks 4, that is, without the notch line 2, is lower than the protruding peaks 4 as shown in the cross-sectional view of FIG. 8. Therefore, the folded curved surface becomes a concavo-convex surface with the protruding peak 4 and the connecting portion 5 in the vertical direction. The folded curved surface that becomes the uneven surface strongly presses the protruding peak 4 against the object to be polished, and polishes the object to be polished more efficiently.
[0018]
The nonwoven fabric polishing sheet 1 of FIG. 1 has a rectangular shape as a whole, is located at the center of the opposing long sides, and is provided with a notch line 2 parallel to the short sides. This nonwoven fabric polishing sheet 1 is bent at a notch line 2 and used as a half size. However, as shown in FIG. 9, the nonwoven fabric polishing sheet 1 of the present invention has an overall shape of a quadrangle, is located at the center of the long side and the short side, and the cut line 2 is orthogonal to the short side and the long side. Can be provided. Also, a plurality of notch lines can be provided in parallel at a predetermined interval.
[0019]
【The invention's effect】
The nonwoven fabric polishing sheet of the present invention is characterized by being able to efficiently polish both a polished surface having a small concave portion and a smooth polished surface by grasping it by hand. That is, the nonwoven fabric polishing sheet of the present invention is cut into a size that can be grasped by hand and polished, and penetrates the surface or both sides and is provided with notch lines arranged in a straight line at a predetermined pitch. This is because the notched line can be folded back as a crease, and the object to be polished can be polished by the cut surface of the notch line exposed on the crease. The folded nonwoven fabric abrasive sheet has numerous cut end faces of fibers exposed on the cut surface of the notch line, and the boundary between the cut surface and the surface protrudes to form a protruding peak. The protruding peaks are provided in two lines on the folding surface, and the inside thereof is a cut surface of the fiber having high polishing efficiency, so that deep recesses can be efficiently polished.
[Brief description of the drawings]
1 is a perspective view of a nonwoven fabric abrasive sheet according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of the nonwoven fabric abrasive sheet shown in FIG. 1. FIG. 3 is a cross section of a nonwoven fabric abrasive sheet according to another embodiment of the present invention. FIG. 4 is a sectional view of a nonwoven fabric polishing sheet according to another embodiment of the present invention. FIG. 5 is a sectional perspective view showing a state in which the nonwoven fabric polishing sheet shown in FIG. FIG. 7 is a cross-sectional view taken along the line AA of the non-woven fabric abrasive sheet shown in FIG. 6. FIG. 8 is a cross-sectional view taken along the line BB of the non-woven fabric abrasive sheet shown in FIG. The perspective view of the nonwoven fabric polishing sheet concerning other Examples of invention [Explanation of numerals]
DESCRIPTION OF SYMBOLS 1 ... Nonwoven fabric polishing sheet 2 ... Notch line 3 ... Cut surface 4 ... Protruding peak 5 ... Connection part

Claims (9)

The fibers are assembled three-dimensionally with no directivity and joined at intersections to a thickness of 3 to 20 mm. In addition, abrasive particles are attached to the voids of the fibers from the surface to the inside. A non-woven fabric polishing sheet having flexibility, which is cut into a size capable of polishing an abrasive,
Set only by arranging a plurality of notches line (2) linearly at a predetermined pitch on the surface, or to penetrate both sides, provided by arranging a plurality of notches line (2) linearly with a predetermined pitch and which, by folding back the cutouts line (2) as a folding line, so expose the cut surfaces of the fold in the cutout line (2) (3), the boundary between the cut surface (3) and the surface and protruding peak (4) , provided so as to face the projecting peak (4) in two rows, the inner cutting surface of the projecting peak of the two columns (4) and (3), the object to be polished by the cut surface which is exposed to the folds (3) A nonwoven fabric polishing sheet that can be polished. The nonwoven fabric polishing sheet according to claim 1, wherein a plurality of notch lines (2) are provided in parallel. The nonwoven fabric abrasive sheet according to claim 1, wherein the length (W) of one notch line (2) is 3 to 30 mm. The nonwoven fabric polishing sheet according to claim 1, wherein the interval (d) between the notch line (2) and the adjacent notch line (2) is 1/10 to 10 times the length (W) of the notch line (2). . Nonwoven abrasive sheet overall size is described in claim 1 is 25~5000cm ^2. The nonwoven fabric polishing sheet according to claim 1 or 5, wherein the overall shape is a quadrangle. The nonwoven fabric polishing sheet according to claim 6, wherein the overall shape is a quadrangle, and a notch line (2) is provided parallel to the short side at the center of the opposing long sides. The nonwoven fabric polishing sheet according to claim 6, wherein the overall shape is a quadrangle, located at the center of the long side and the short side, and provided with a notch line (2) orthogonal to the short side and the long side. . The nonwoven fabric polishing sheet according to claim 1, wherein the entire thickness is 5 to 15 mm.

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