METHOD FOR MANUFACTURING POLISHING PAD
First Claim
1. A method for manufacturing a polishing pad, comprising the steps of:
- preparing a cell-dispersed urethane composition by a mechanical foaming method;
continuously discharging the cell-dispersed urethane composition onto a face material, while feeding the face material;
laminating another face material on the cell-dispersed urethane composition;
curing the cell-dispersed urethane composition, while controlling its thickness to be uniform, so that a polishing layer comprising a polyurethane foam is formed;
cutting the polishing layer parallel to the face into two pieces so that two long polishing layers each comprising the polishing layer and the face material are simultaneously formed; and
cutting the long polishing layers.
1 Assignment
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Accused Products
Abstract
A method for manufacturing a polishing pad, which may be laminated, with a small number of manufacturing steps, high productivity and no peeling between a polishing layer and a cushion layer includes preparing a cell-dispersed urethane composition by a mechanical foaming method; continuously discharging the cell-dispersed urethane composition onto a face material, while feeding the face material; laminating another face material on the cell-dispersed urethane composition; curing the cell-dispersed urethane composition, while controlling its thickness to be uniform, so that a polishing layer including a polyurethane foam is formed; cutting the polishing layer parallel to the face into two pieces so that two long polishing layers each including the polishing layer and the face material are simultaneously formed; and cutting the long polishing layers to produce the polishing pad.
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Citations
36 Claims
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1. A method for manufacturing a polishing pad, comprising the steps of:
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preparing a cell-dispersed urethane composition by a mechanical foaming method; continuously discharging the cell-dispersed urethane composition onto a face material, while feeding the face material; laminating another face material on the cell-dispersed urethane composition; curing the cell-dispersed urethane composition, while controlling its thickness to be uniform, so that a polishing layer comprising a polyurethane foam is formed; cutting the polishing layer parallel to the face into two pieces so that two long polishing layers each comprising the polishing layer and the face material are simultaneously formed; and cutting the long polishing layers. - View Dependent Claims (2)
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3. A method for manufacturing a laminated polishing pad, comprising the steps of:
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preparing a cell-dispersed urethane composition by a mechanical foaming method; continuously discharging the cell-dispersed urethane composition onto a cushion layer, while feeding the cushion layer; laminating another cushion layer on the cell-dispersed urethane composition; curing the cell-dispersed urethane composition, while controlling its thickness to be uniform, so that a polishing layer comprising a polyurethane foam is formed; cutting the polishing layer parallel to the face into two pieces so that two long laminated sheets each comprising the polishing layer and the cushion layer are simultaneously formed; and cutting the long laminated sheets. - View Dependent Claims (4)
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5. A method for manufacturing a polishing pad, comprising the steps of:
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preparing a cell-dispersed urethane composition by a mechanical foaming method; providing spacers on both ends parts and/or an inner site of a face material, while feeding the face material; continuously discharging said cell-dispersed urethane composition onto a part of said face material where the spacer is not provided; laminating another face material on said discharged cell-dispersed urethane composition; curing the cell-dispersed urethane composition, while controlling its thickness to be uniform, so that a long polishing layer comprising a polyurethane foam is formed; and cutting the long polishing layer. - View Dependent Claims (6, 7, 8, 9, 10, 36)
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11. A method for manufacturing a laminated polishing pad, comprising the steps of:
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preparing a cell-dispersed urethane composition by a mechanical foaming method; providing spacers on both ends parts and/or an inner site of a cushion layer, while feeding the cushion layer; continuously discharging said cell-dispersed urethane composition onto a part of said cushion layer where the spacer is not provided; laminating a face material on said discharged cell-dispersed urethane composition; curing the cell-dispersed urethane composition to form a polishing layer comprising a polyurethane foam, while controlling its thickness to be uniform, so that a long laminated sheet is formed; and cutting the long laminated sheet. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for manufacturing a polishing pad, comprising the steps of:
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preparing a cell-dispersed urethane composition by a mechanical foaming method; continuously or intermittently discharging a light transmitting region-forming material onto a prescribed site of a face material, while feeding the face material; continuously discharging said cell-dispersed urethane composition onto a part of said face material where the light transmitting region-forming material is not provided; laminating another face material on said discharged light transmitting region-forming material and cell-dispersed urethane composition; curing the light transmitting region-forming material and the cell-dispersed urethane composition, while controlling their thickness to be uniform, so that a long polishing layer comprising a light transmitting region and a polishing region integrated therewith is formed; and cutting the long polishing layer. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A method for manufacturing a laminated polishing pad, comprising the steps of:
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preparing a cell-dispersed urethane composition by a mechanical foaming method; discharging a light transmitting region-forming material such that the material is deposited in and on through holes, while feeding a cushion layer having continuously or intermittently provided through holes; continuously discharging said cell-dispersed urethane composition onto a part of said cushion layer where the light transmitting region-forming material is not provided; laminating a face material on the discharged light transmitting region-forming material and cell-dispersed urethane composition; curing the light transmitting region-forming material and the cell-dispersed urethane composition, while controlling their thickness to be uniform, so that a long laminated sheet comprising a light transmitting region and a polishing region integrated therewith is formed; and cutting the long laminated sheet. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A method for manufacturing a groove-carrying polishing pad, comprising the steps of:
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preparing a cell-dispersed urethane composition by a mechanical foaming method; continuously discharging the cell-dispersed urethane composition onto a conveyor belt having a recessed structure; laminating a face material on the discharged cell-dispersed urethane composition; curing the cell-dispersed urethane composition, while controlling its thickness to be uniform, so that a groove-carrying long polishing layer comprising a polyurethane foam is formed; separating the groove-carrying long polishing layer from the conveyor belt; and cutting the groove-carrying long polishing layer. - View Dependent Claims (34)
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31. A method for manufacturing a groove-carrying polishing pad, comprising the steps of:
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preparing a cell-dispersed urethane composition by a mechanical foaming method; continuously discharging the cell-dispersed urethane composition onto a release sheet having a recessed structure, while feeding the release sheet; laminating a face material on the discharged cell-dispersed urethane composition; curing the cell-dispersed urethane composition, while controlling its thickness to be uniform, so that a groove-carrying long polishing layer comprising a polyurethane foam is formed; separating the release sheet from the groove-carrying long polishing layer; and cutting the groove-carrying long polishing layer.
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32. A method for manufacturing a groove-carrying laminated polishing pad, comprising the steps of:
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preparing a cell-dispersed urethane composition by a mechanical foaming method; continuously discharging the cell-dispersed urethane composition onto a conveyor belt having a recessed structure; laminating a cushion layer on the discharged cell-dispersed urethane composition; curing the cell-dispersed urethane composition, while controlling its thickness to be uniform, so that a groove-carrying long polishing layer comprising a polyurethane foam is formed and then a groove-carrying long laminated sheet is formed; separating the groove-carrying long laminated sheet from the conveyor belt; and cutting the groove-carrying long laminated sheet. - View Dependent Claims (35)
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33. A method for manufacturing a groove-carrying laminated polishing pad, comprising the steps of:
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preparing a cell-dispersed urethane composition by a mechanical foaming method; continuously discharging the cell-dispersed urethane composition onto a release sheet having a recessed structure, while feeding the release sheet; laminating a cushion layer on the discharged cell-dispersed urethane composition; curing the cell-dispersed urethane composition, while controlling its thickness to be uniform, so that a groove-carrying long polishing layer comprising a polyurethane foam is formed and then a groove-carrying long laminated sheet is formed; separating the release sheet from the groove-carrying long laminated sheet; and cutting the groove-carrying long laminated sheet.
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Specification