Granted Patent B2

US 7,074,289 · App. 10/136,198 · Granted Jul 11, 2006

Abstract

Claims (53)

1. A method for preparing laminating materials comprising:

providing two layers of interleaf, wherein each layer of interleaf comprises a textured surface;

extruding a thermoplastic adhesive with a die said thermoplastic adhesive selected from the group consisting of polyurethane, polyvinylbutyrate, polyvinylacetate, polyester, and combinations thereof;

forming a composite by applying one layer of interleaf to each of the top and bottom surfaces of the adhesive before cooling the adhesive;

pressing the composite with rolls to adhere the two layers of interleaf to the adhesive while the adhesive is still thermoplastic such that the textured surface of each layer of interleaf is impressed into the adhesive and impressing an embossed surface of an embossing stack into the adhesive such that the embossed surface is impressed into the adhesive, the embossing stack formed from at least two rolls; and

using the pressed composite to form a security glazing.

2. The method of claim 1 further comprising:

cooling the adhesive by passing the composite into pressure contact with a cooling surface after the composite has been pressed; and

collecting the composite.

3. The method of claim 2 wherein the collecting comprises:

wrapping the composite as a unit on a roll.

4. The method of claim 2 wherein the collecting comprises:

cutting and stacking the composite.

5. The method of claim 1 wherein the pressing comprises:

evacuating air from between the adhesive and the layers of interleaf.

6. The method of claim 1 wherein the extruding comprises:

providing a polyurethane film having a thickness of about 0.5–250 mils.

7. The method of claim 1 wherein the extruding comprises:

providing polyurethane film having a thickness of about 2–100 mils.

8. The method of claim 1 , wherein the providing comprises:

supplying the two layers of interleaf, with each layer having a thickness of about 0.5–15 mils.

9. The method of claim 1 wherein the providing comprises:

supplying the two layers of interleaf, with each layer having a thickness of about 2–6 mils.

10. The method of claim 1 wherein the supplying comprises:

providing the textured surface, having a depth of about 5% to 100% of a thickness of each layer.

11. The method of claim 1 wherein the providing comprises:

providing the textured surface, having a depth of about 20% to 80% of a thickness of each layer.

12. The method of claim 1 wherein the textured surface of each of the interleaf layers comprises a random pattern or a diamond pattern.

13. The method of claim 1 wherein each of the layers of interleaf comprises a material selected from the group consisting of polyethylene, polypropylene, PET, and combinations thereof.

14. The method of claim 1 wherein using the pressed composite to form a security glazing comprises:

removing the layer of interleaf from the top surface of the adhesive;

applying the top surface of the adhesive to a first substrate;

removing trapped air between the top surface of the adhesive and the first substrate;

removing the layer of interleaf from the bottom surface of the adhesive; and

applying a second substrate to the bottom surface of the adhesive.

15. The method of claim 14 wherein the security glazing comprises touch screens, EMI screens, windows, car side windows, computer screens, monitors, television screens, and bullet resistant laminates.

16. A method for preparing laminating materials comprising:

providing a pair of layers of polyethylene interleaf, each layer having a textured surface and a thickness of about 0.5–15 mils;

extruding a polyurethane film, having a thickness of about 0.5–250 mils, with a die;

forming a composite by applying the first layer of interleaf to a top surface of the polyurethane film and by applying the second layer of interleaf to a bottom surface of the polyurethane film;

pressing the composite between rolls of an embossing stack, having an embossing surface;

adhering the layers of interleaf to the film while the film is still thermoplastic;

impressing the textured surface of the layers of interleaf and the embossing surface into the film;

passing the composite into pressure contact with a cooling surface to cool the film on the composite;

collecting the composite; and

using the collected composite to form a security glazing.

17. The method of claim 16 wherein using the collected composite to form a security glazing comprises:

removing the first layer of polyethylene interleaf from the composite;

applying the top surface of the polyurethane film to a first substrate;

removing trapped air between the top surface of the polyurethane film and the first substrate;

removing the second layer of polyethylene interleaf from the composite; and

applying the bottom surface of the polyurethane film to a second substrate;

wherein the first substrate, the second substrate, and the polyurethane film form the security glazing, wherein the security glazing is used to form a product comprising touch screens, EMI screens, windows, car side windows, computer screens, monitors, television screens, and bullet resistant laminates.

Assignments (13)