Edging pad having different adhesive zones

Abstract

The invention relates to an edging pad for releasably connecting a material blank that is to be edged to a holder, wherein the edging pad has a polymeric carrier layer and adhesive coatings which are applied to both sides of the polymeric carrier layer, wherein one side of the polymeric carrier layer, which is to be connected to the holder, has an adhesive coating formed of a first adhesive, and the other side of the polymeric carrier layer, which is to be connected to the material blank, has an adhesive coating formed of a second and a third adhesive which are different from one another, such that the second adhesive provides adhesiveness to the material blank and the third adhesive is an adhesive which limits twisting and slippage of the polymeric carrier layer relative to the material blank, wherein the second adhesive and the third adhesive are applied to the other side of the polymeric carrier layer in separate regions.

Claims

1. An edging pad for releasably connecting a material blank that is to be edged to a holder, wherein the edging pad has a polymeric carrier layer and adhesive coatings which are applied to both sides of the polymeric carrier layer, wherein one side of the polymeric carrier layer, which is to be connected to the holder, has an adhesive coating formed of a first adhesive, and the other side of the polymeric carrier layer, which is to be connected to the material blank, has an adhesive coating formed of a second and a third adhesive which are different from one another, such that the second adhesive provides adhesiveness to the material blank and the third adhesive is an adhesive which limits twisting or slippage of the polymeric carrier layer relative to the material blank, wherein the second adhesive and the third adhesive are applied to the other side of the polymeric carrier layer in separate regions.

2. The edging pad according to claim 1, in which the polymeric carrier layer is formed of a polymer selected from the group consisting of polyolefin, polyester, polyamide, polystyrene, polycarbonate, polyurethane, polyvinyl acetate, ethylene vinyl acetate, ABS, polycarbonate, polyimide, acetate, epoxy polymers, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyvinylidene fluoride, polyaramid, polysulfone, polytetrafluoroethylene, copolymers or mixtures thereof, as well as elastomers.

3. The edging pad according to claim 1, in which the first, the second and the third adhesives are selected independently from pressure-sensitive copolymer adhesives which are reaction products of the polymerization of at least one A monomer and at least one B monomer, wherein the A monomer is a polymerizable monomer which comprises an acrylate or methacrylate ester of a non-tertiary alcohol or of a mixture of non-tertiary alcohols, and the B monomer is an ethylenically unsaturated compound.

4. The edging pad according to one of claim 1, in which the region in which the second adhesive is applied occupies from 5% to 50% of the total area of the other side of the polymeric carrier layer, and the region in which the third adhesive is applied occupies from 95% to 50% of the total area of the other side of the polymeric carrier layer.

5. The edging pad according to one of claim 1, in which the region in which the second adhesive is applied occupies from 5% to 40% of the total area of the other side of the polymeric carrier layer, and the region in which the third adhesive is applied occupies from 95% to 60% of the total area of the other side of the polymeric carrier layer.

6. The edging pad according to one of claim 1, in which the region in which the second adhesive is applied occupies from 10% to 30% of the total area of the other side of the polymeric carrier layer, and the region in which the third adhesive is applied occupies from 90% to 70% of the total area of the other side of the polymeric carrier layer.

7. The edging pad according to one of claim 1, in which the region in which the second adhesive is applied occupies from 10% to 20% of the total area of the other side of the polymeric carrier layer, and the region in which the third adhesive is applied occupies from 90% to 80% of the total area of the other side of the polymeric carrier layer.

8. The edging pad according to one of claim 1, in which a) the second adhesive is applied in a radially inner region of the polymeric carrier layer, and the third adhesive is applied in a radially outer region of the polymeric carrier layer outwards from the radially inner region, or b) the second adhesive is applied in a radially inner region and a radially outer region of the polymeric carrier layer outwards from the radially inner region, and the third adhesive is applied to the polymeric carrier layer in a region between the radially inner region and the radially outer region, or c) the third adhesive is applied in a radially inner region of the polymeric carrier layer, and the second adhesive is applied in a radially outer region of the polymeric carrier layer outwards from the radially inner region, or d) the second adhesive is applied to the polymeric carrier layer in strips which are spaced apart and arranged radially in the manner of spokes, starting from the radial center of the edging pad, and the third adhesive is applied to the polymeric carrier layer in the region between the strips which are spaced apart and arranged radially in the manner of spokes, or e) the second adhesive is applied to the polymeric carrier layer in strips which are spaced apart and arranged radially in the manner of spokes, starting from the radial center of the edging pad, and in a radially outer region, and the third adhesive is applied to the polymeric carrier layer in the region between the strips which are spaced apart and arranged radially in the manner of spokes and the radially outer region, or f) the second adhesive is applied to the polymeric carrier layer in parallel strips which are spaced apart, and the third adhesive is applied to the polymeric carrier layer in the region between the spaced apart parallel strips.

9. The edging pad according to one of claim 1, in which the polymeric carrier layer has a thickness in a range of from 0.1 mm to 4 mm.

10. The edging pad according to one of claim 1, in which the adhesive coatings independently have a thickness of from 2 to 50 m.

11. The edging pad according to one of claim 1, wherein the edging pad is circular or oval.

12. The edging pad according to one of claim 1, wherein the edging pad has a hole in the radial center.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a cross-sectional view of an example of an edging pad together with a blocker element and a coated optical lens, which are connected thereto,

(2) FIG. 2 is a top view of the adhesive coating of an example of an edging pad, which coating serves to connect the edging pad to a blocker element, and

(3) FIGS. 3a) to f) are top views of different embodiments of adhesive coatings (in particular of different examples of the arrangement of the second adhesive and the third adhesive) of the example of an edging pad of FIG. 2, which adhesive coatings are used for connection to an optical lens.

(4) An embodiment of the present invention is described in greater detail below with reference to the drawings.

EXAMPLE

(5) FIG. 1 is a cross-sectional view of an example of an edging pad 1 together with a blocker element 6, as an example of a holder, and an optical lens 7, coated in the above-mentioned manner, as an example of a material blank that is to be edged, which are releasably connected to the edging pad 1.

(6) As can be seen in FIG. 1, the blocker element 6 is attached to the edging pad 1 by the adhesive coating 3. Since the blocker element 6 is produced from a plastics material which is conventional for this purpose and does not make any particular demands of the adhesive, there can be used for the adhesive in the adhesive coating 3 an adhesive which is conventional for this purpose and which can expediently be selected by the person skilled in the art. According to FIG. 2, the adhesive coating 3 is applied to the entire surface of one side of the polymeric carrier layer 2, so that the largest possible contact surface with the blocker element 6 is produced and the greatest possible adhesion is thus achieved. However, depending on the adhesive used for the adhesive coating 3, it is also conceivable to coat only a portion of one side of the polymeric carrier layer 2 with the adhesive, for example in the form of scattered dots or spots or strips of adhesive.

(7) The optical lens 7 is also attached to the edging pad 1 by the adhesive coating 5. According to FIG. 3a), the radially inner region 5a and the radially outer region 5b of the adhesive coating 5 are by way of example in the form of concentric rings, a hole 4 being formed in the radial centre of the edging pad 1.

(8) The radially inner region 5a is provided with an adhesive which has particularly good adhesiveness to the coated optical lens 7. The radially outer region 5b, on the other hand, is coated with an adhesive which is optimized in terms of preventing twisting of the coated optical lens 7 so that, in combination, both excellent adhesion of the coated optical lens 7 is obtained and twisting thereof is largely limited or even prevented completely.

(9) The combination shown in FIG. 1 of edging pad 1, blocker element 6 and optical lens 7 was inserted into an E.3 edging device from Weco, and an edge grinding operation was carried out. It was found that the coated optical lens 7 adhered to the edging pad 1 in such a manner that, in addition to excellent adhesion, no problems at all occurred with regard to twisting of the optical lens 7 on the edging pad 1.

(10) The novel configuration of adhesives on the material blank side of the edging pad thus eliminates the problems of edging pads of the prior art with regard to twisting of the material blank that is to be edged during the edging operation.

LIST OF REFERENCE NUMERALS

(11) 1 Edging pad 2 Polymeric carrier layer 3 Adhesive coating 4 Hole 5 Adhesive coating 5a, 5c, 5d, 5e Region in which the second adhesive is applied 5b Region in which the third adhesive is applied 6 Holder or blocker element 7 Material blank or optical lens