Device and method for length cutting in ultrathin glasses

Patent metadata

Field	Value
Publication number	US-2022017401-A1
Application number	US-202117376076-A
Country	US
Kind code	A1
Filing date	Jul 14, 2021
Priority date	Jul 14, 2020
Publication date	Jan 20, 2022
Grant date	—

Abstract

A method for the production of glass ribbon portions is provided that includes: transporting a glass ribbon at a velocity v 1 , wherein the velocity v 1 is dependent on the predetermined glass thickness (d 1 ), with the application of a tensile stress parallel to the edges of the glass ribbon, in a plane E 1 , and cooling the glass ribbon at a cooling rate that is dependent on the predetermined glass thickness (d 1 ), inserting a score on the surface of the glass ribbon in at least one edge area by scoring the glass surface with a scoring tool, wherein the score has an angle a to the transport direction of the glass ribbon, deflecting the glass ribbon in a plane E 2 to generate a bending stress and separating a glass ribbon portion with the formation of edges by breaking the glass ribbon on the extension of the score running transversely to the glass ribbon.

First claim

What is claimed is:

1 . A method for producing glass ribbon portions, comprising:
hot forming a continuous glass ribbon with a ribbon thickness (d) in a range from 15 μm to 150 μm from a glass melt; cooling the glass ribbon at a cooling rate that is dependent on the ribbon thickness (d); transporting the glass ribbon along a first plane in a transport direction and at a first velocity (v 1 ) so as to provide a tensile stress parallel to edges of the glass ribbon; generating a score in a surface the glass ribbon using a scoring tool at a scoring velocity (v score ) and at an angle (β) to the transport direction; and diverting the glass ribbon from the first plane to a second plane so as to generate a bending stress with a main stress line with a glass ribbon portion breaking from the glass ribbon through spontaneous crack propagation at the score along the main stress line in a direction of the ribbon thickness (d) of the glass ribbon.

2 . The method of claim 1 , wherein the edges have an edge thickness that is greater than the ribbon thickness (d), and wherein the step of generating the score comprises generating the score on at least one of the edges.

3 . The method of claim 1 , further comprising transporting the glass ribbon in the second plane at a second velocity.

4 . The method of claim 3 , wherein the first velocity (v 1 ) is different from the second velocity.

5 . The method of claim 3 , wherein the first velocity (v 1 ) is less than the second velocity.

6 . The method of claim 1 , further comprising separating the glass ribbon portion from the glass ribbon by transporting the glass ribbon portion at a third velocity.

7 . The method of claim 6 , wherein the first velocity (v 1 ) is less than the third velocity.

8 . The method of claim 1 , wherein the angle (β) is in a range from 80° to 100°.

9 . The method of claim 1 , wherein the angle (β) is adapted to the first velocity (v 1 ) and to the scoring velocity (v score ) so that:
β=arccos( v 1 /v score ).

10 . The method of claim 1 , further comprising moving the scoring tool on an elastic tool carrier so that the scoring tool moves in the transport direction.

11 . The method of claim 1 , wherein the first and second planes are angled with respect to one another and/or have a height difference with respect to one another.

12 . The method of claim 1 , wherein the diverting step further comprises:
contacting the glass ribbon with a guiding wheel, wherein a contact point between the glass ribbon and the guiding wheel is in the first plane; and driving the guiding wheel at a rotational speed that is greater than the first velocity (v 1 ).

13 . The method of claim 1 , wherein the diverting step comprises allowing the glass ribbon to bending by its own weight.

14 . The method of claim 1 , wherein the cooling rate is equal to or greater than 10 K/s.

15 . The method of claim 1 , wherein the cooling rate is greater than 25 K/s.

16 . The method of claim 1 , wherein the cooling rate is dependent on the ribbon thickness (d) in a range from (1/d) 5 K/(min*μm) to 280 K/(min*μm).

17 . The method of claim 1 , further comprising removing border areas of the glass ribbon portion.

18 . The method of claim 1 , further comprising:
repeating the generating and diverting so as to break a plurality of glass ribbon portions from the glass ribbon; and stacking the plurality of glass ribbon portions.

19 . The method according to claim 1 , wherein the glass ribbon portion has a length in a range from 100 to 2000 m.

20 . The method according to claim 1 , further comprising:
repeating the generating and diverting so as to break a plurality of glass ribbon portions from the glass ribbon; sticking the plurality of glass ribbon portions to a paper tape; and coiling the plurality of glass ribbon portions together with the paper tape.

21 . A device for producing glass ribbon portions, comprising:
a first transport device configured to transport a glass ribbon in a transport direction, wherein the first transport devices is wider than a width of the glass ribbon and is driven by a first drive; a second transport device configured to transport the glass ribbon in the transport direction, wherein the second transport devices is wider than the width of the glass ribbon and is driven by a second drive, the first and second drives being independent of one another; and a scoring device in an area of the first transport device, the scoring device being configured to score a surface of the glass ribbon and being arranged so that the scoring takes place at an angle (a) in the range from 80 to 100° to the transport direction, wherein the first and the second transport devices are arranged with respect to one another so as to subject the glass ribbon to bending stress as the glass ribbon runs from the first transport device to the second transport device.

Assignees

• Schott Ag

Inventors

• Wegener Holger
• Schwertfeger Rainer
• Maedje Michael
• Diekmann Christian
• Langer Markus

Classifications

• C03B33/03

  Glass cutting tables; Apparatus for transporting or handling sheet glass during the cutting or breaking operations · CPC title

• C03B33/033 Primary

  Apparatus for opening score lines in glass sheets · CPC title

• Y02P40/57

  Improving the yield, e-g- reduction of reject rates · CPC title

• C03B33/037

  Controlling or regulating · CPC title

• C03B33/0235 Primary

  Ribbons · CPC title