Electrostatically pinned glass roll, methods and apparatus for making

Patent metadata

Field	Value
Publication number	US-10322961-B2
Application number	US-201715640783-A
Country	US
Kind code	B2
Filing date	Jul 3, 2017
Priority date	Oct 31, 2011
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

A roll ( 10 ) of glass ribbon ( 20 ) and an interleaf material ( 40 ) disposed in alternating layers, wherein a layer of the interleaf material is pinned to an adjacent layer of the glass ribbon by an electrostatic force that is of a value so that a shear force required to cause slip between the interleaf material and the glass ribbon is greater than or equal to 10 times that required to cause slip between them when not electrostatically pinned together. Methods for winding and unwinding the roll, as well as an apparatus for winding the glass ribbon and interleaf material into a roll, are also disclosed.

First claim

What is claimed is:

1. A method of rolling glass comprising:
conveying a glass ribbon relative to a first charging head so as to impart a first charge to the glass ribbon;
conveying an interleaf material relative to a second charging head so as to impart a second charge to the interleaf material;
juxtaposing the glass ribbon and the interleaf material so that the first and second charges are attracted to one another so as to pin the glass ribbon and the interleaf material in contact with one another; and
rolling the pinned glass ribbon and interleaf material together into a roll including alternating layers of glass ribbon and interleaf material.

2. The method of claim 1 , wherein the first charging head and the second charging head are disposed adjacent one another across a gap, wherein a conveying path of the interleaf material and the glass ribbon extends through the gap, and wherein there are no rollers disposed within the gap.

3. The method of claim 1 , wherein the first charging head does not contact the glass ribbon.

4. The method of claim 1 , wherein the first electrode is spaced from the second electrode by a distance ranging from 1 to 4 inches (2.5 to 10 cm).

5. The method of claim 4 , further comprising guiding the interleaf material and the glass ribbon after they have been electrostatically pinned together so as to prevent the interleaf material and glass ribbon from contacting the first electrode or the second electrode as the roll increases in diameter.

6. The method of claim 5 , wherein the guiding comprises contacting the interleaf material with a roller.

7. The method of claim 1 , wherein the first charge is negative and the second charge is positive.

8. The method of claim 1 , wherein the first charge and the second charge are balanced so that the roll has a net neutral charge.

9. The method of claim 1 , wherein the difference between the first charge and the second charge is from 24 to 36 kV.

10. A method of unwinding a glass roll, having layers of glass ribbon and interleaf material electrostatically pinned together, comprising:
separating a first layer of glass ribbon and interleaf material from the roll;
peeling the interleaf material from the glass ribbon; and
neutralizing the electrostatic charge on the glass ribbon.

11. The method of claim 10 , further comprising neutralizing the electrostatic charge on the interleaf material.

Assignees

• Corning Inc

Inventors

• Merz Gary Edward
• Tosch John Earl
• Trzeciak Thaddeus Francis

Classifications

• B65H2301/5132

  Bringing electrostatic charge · CPC title

• B65H18/28

  Wound package of webs · CPC title

• H02N13/00

  Clutches or holding devices using electrostatic attraction, e.g. using Johnson-Rahbek effect · CPC title

• B65H2801/61

  Display device manufacture, e.g. liquid crystal displays · CPC title

• B32B17/065

  of paper or cardboard · CPC title