公开(公告)号：US11414336B2

公开(公告)日：2022-08-16

申请号：US16690626

申请日：2019-11-21

Applicant: CORNING INCORPORATED

Inventor： Adam Charles Berkey ,  Martin A de la Torre ,  Sowmya Krishnamurthy ,  Jiandong Meng ,  David Posada-Pineda ,  Ryan Daniel Ratchford

IPC: C03B9/36 ,  C03B9/38 ,  C03B17/04

Abstract: A muffle for a glass tube forming process includes an inlet end coupled to a bowl, an outlet end having an inner dimension larger than an inner dimension of the inlet end, and a sidewall extending from inlet end to the outlet end. A radial distance from a center axis of the muffle to an inner surface of the sidewall increases from the inlet end to the outlet end and the sidewall is substantially free of abrupt changes in the radial distance that produce instability regions within the muffle. The muffle includes a channel between an outer surface of a portion of the sidewall and an insulating layer disposed about the sidewall, the channel being operable to pass a heat transfer fluid into thermal communication with the sidewall to provide cooling to the muffle. Glass forming systems including the muffle and glass tube forming processes are also disclosed.

公开(公告)号：US20200172423A1

公开(公告)日：2020-06-04

申请号：US16690626

申请日：2019-11-21

Applicant: CORNING INCORPORATED

Inventor： Adam Charles Berkey ,  Martin A de la Torre ,  Sowmya Krishnamurthy ,  Jiandong Meng ,  David Posada-Pineda ,  Ryan Daniel Ratchford

IPC: C03B9/36 ,  C03B9/38

Abstract: A muffle for a glass tube forming process includes an inlet end coupled to a bowl, an outlet end having an inner dimension larger than an inner dimension of the inlet end, and a sidewall extending from inlet end to the outlet end. A radial distance from a center axis of the muffle to an inner surface of the sidewall increases from the inlet end to the outlet end and the sidewall is substantially free of abrupt changes in the radial distance that produce instability regions within the muffle. The muffle includes a channel between an outer surface of a portion of the sidewall and an insulating layer disposed about the sidewall, the channel being operable to pass a heat transfer fluid into thermal communication with the sidewall to provide cooling to the muffle. Glass forming systems including the muffle and glass tube forming processes are also disclosed.

公开(公告)号：US11591248B2

公开(公告)日：2023-02-28

申请号：US15604978

申请日：2017-05-25

Applicant: CORNING INCORPORATED

Inventor： Gilbert De Angelis ,  Dale Madard Fisher, Jr. ,  Shripad Joshi ,  Sowmya Krishnamurthy ,  Elias Panides ,  David Posada-Pineda

IPC: C03B17/04

Abstract: Heating apparatuses and methods for glass tubing manufacturing are disclosed. A heating apparatus for glass tubing manufacturing includes a bowl configured to receive molten glass and a plurality of heating elements thermally coupled to the bowl. The bowl has a bowl height and includes a tub portion configured to hold the molten glass, a bowl well extending beneath the tub portion, and an orifice at a distal end of the bowl well. The plurality of heating elements include a first heating element disposed at a first vertical location along the bowl height, a second heating element disposed at a second vertical location along the bowl height, wherein the first vertical location is vertically spaced apart from the second vertical location.

公开(公告)号：US20170341966A1

公开(公告)日：2017-11-30

申请号：US15604978

申请日：2017-05-25

Applicant: CORNING INCORPORATED

Inventor： Gilbert De Angelis ,  Dale Madard Fisher, Jr. ,  Shripad Joshi ,  Sowmya Krishnamurthy ,  Elias Panides ,  David Posada-Pineda

IPC: C03B17/04

CPC classification number: C03B17/04

Abstract: Heating apparatuses and methods for glass tubing manufacturing are disclosed. A heating apparatus for glass tubing manufacturing includes a bowl configured to receive molten glass and a plurality of heating elements thermally coupled to the bowl. The bowl has a bowl height and includes a tub portion configured to hold the molten glass, a bowl well extending beneath the tub portion, and an orifice at a distal end of the bowl well. The plurality of heating elements include a first heating element disposed at a first vertical location along the bowl height, a second heating element disposed at a second vertical location along the bowl height, wherein the first vertical location is vertically spaced apart from the second vertical location.