AU586407B2 - Creación de Inventos y Patentes con Inteligencia Artificial

AU586407B2 – Method and apparatus for heating mineral fibers
– Google Patents

AU586407B2 – Method and apparatus for heating mineral fibers
– Google Patents
Method and apparatus for heating mineral fibers

Info

Publication number
AU586407B2

AU586407B2
AU10468/88A
AU1046888A
AU586407B2
AU 586407 B2
AU586407 B2
AU 586407B2
AU 10468/88 A
AU10468/88 A
AU 10468/88A
AU 1046888 A
AU1046888 A
AU 1046888A
AU 586407 B2
AU586407 B2
AU 586407B2
Authority
AU
Australia
Prior art keywords
heating
oven
conveyor
heating means
hot gases
Prior art date
1986-12-15
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Ceased

Application number
AU10468/88A
Other versions

AU1046888A
(en

Inventor
James S. Belt
Kwan Y. Kim
Yee Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Owens Corning

Original Assignee
Owens Corning Fiberglas Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1986-12-15
Filing date
1987-09-16
Publication date
1989-07-06

1987-09-16
Application filed by Owens Corning Fiberglas Corp
filed
Critical
Owens Corning Fiberglas Corp

1988-07-15
Publication of AU1046888A
publication
Critical
patent/AU1046888A/en

1989-07-06
Application granted
granted
Critical

1989-07-06
Publication of AU586407B2
publication
Critical
patent/AU586407B2/en

2007-09-16
Anticipated expiration
legal-status
Critical

Status
Ceased
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

238000010438
heat treatment
Methods

0.000
title
claims
description
48

238000000034
method
Methods

0.000
title
claims
description
12

239000002557
mineral fiber
Substances

0.000
title
description
6

239000007789
gas
Substances

0.000
claims
description
48

238000009413
insulation
Methods

0.000
claims
description
20

239000012774
insulation material
Substances

0.000
claims
description
20

230000006698
induction
Effects

0.000
claims
description
12

229910052500
inorganic mineral
Inorganic materials

0.000
claims
description
9

239000011707
mineral
Substances

0.000
claims
description
9

238000011144
upstream manufacturing
Methods

0.000
claims
description
6

230000010006
flight
Effects

0.000
description
13

210000002268
wool
Anatomy

0.000
description
7

239000011230
binding agent
Substances

0.000
description
6

238000001035
drying
Methods

0.000
description
6

239000000463
material
Substances

0.000
description
5

239000000835
fiber
Substances

0.000
description
4

239000003365
glass fiber
Substances

0.000
description
4

238000004519
manufacturing process
Methods

0.000
description
2

239000006060
molten glass
Substances

0.000
description
2

230000015572
biosynthetic process
Effects

0.000
description
1

238000010276
construction
Methods

0.000
description
1

238000001723
curing
Methods

0.000
description
1

230000000694
effects
Effects

0.000
description
1

238000005516
engineering process
Methods

0.000
description
1

SLGWESQGEUXWJQ-UHFFFAOYSA-N
formaldehyde;phenol
Chemical compound

O=C.OC1=CC=CC=C1
SLGWESQGEUXWJQ-UHFFFAOYSA-N
0.000
description
1

239000000314
lubricant
Substances

0.000
description
1

229920001568
phenolic resin
Polymers

0.000
description
1

239000011435
rock
Substances

0.000
description
1

239000002893
slag
Substances

0.000
description
1

Classifications

F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

F27—FURNACES; KILNS; OVENS; RETORTS

F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS

F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity

F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

F26—DRYING

F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM

F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement

F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces

F26B17/026—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the material being moved in-between belts which may be perforated

Description

D E S C R I P T O N METHOD FOR HEATING MINERAL FIBERS 0 TECHNICAL FIELD
This invention pertains to apparatus for heating fibrous mineral material in an oven. More particularly, this invention relates to apparatus for directing hot gases through a fibrous mineral insulation material as the 5 material is passed through an oven in order to dry and/or cure the binder on the insulation material.
BACKGROUND ART It is a common practice in the manufacture of mineral fiber insulation to pass the insulation between a 0 pair of fora inous conveyors, or belts, mounted for travel through the curing oven. Hot gases are passed through the insulation to more effectively cure the binder in the insulation. Associated with the oven are supplies of hot drying and curing gases, usually heated air, which travel 5 generally upwardly or downwardly through the insulation material. Typically, the curing ovens are divided into zones, and flexible seals are sometimes used to prevent the curing gases from passing from one zone to an adjacent zone. The common construction for the conveyors is that of Q apertured flights connected in series and driven by a chain. The ends of the flights are mounted on wheels which ride in tracks running the length of the oven.
One of the problems with ovens for heating mineral material is that the ovens cannot meet the current capacity 5 demands made upon them. Increases in technology and other parts of manufacturing processes, such as the mineral fiber

forming portion of the process have enabled increases in line speed which push existing ovens to their capacity. Furthermore, the recent trend in the glass fiber industry, in particular, has been to reduce fiber diameter. This 5 results in a desire to reduce the flow of curing gases in the oven to avoid structural damage to the mineral fiber insulation.
A simple, but expensive, solution is to extend the length of the oven and add one or more additional oven 0 zones. This is, of course, quite expensive, and in some plant facilities it is physically impossible because of space constraints. Another solution is to increase the temperature of the gases in the first oven zone. In many cases however, the high temperature tolerance of the oven 5 conveyor lubricants provide an upper limit on the temperature of curing gases. There is a need for low cost way to improve the efficiency of ovens for drying and curing fibrous insulation material without requiring large amounts of capital or space. 0 DISCLOSURE OF INVENTION
We have now developed a method and apparatus for improving the efficiency of ovens for heating fibrous mineral insulation material and that is to preheat the conveyors before they travel through the oven with the insulation material to be heated. The hot gases in the first oven zone are working primarily to dry the mineral fiber insulation material. After the material is dried, it is cured, and this usually occurs in a downstream oven zone. We have found that a significant portion of the heat energy Q of the hot gases flowing in the first oven zone is absorbed by the conveyor itself, thereby reducing the temperature of the hot gases passing through the insulation material. By raising the temperature of the oven conveyor prior to the time it enters the first oven zone, the conveyor itself will not be robbing the hot gases of their heat, and the hot gases will do a more efficient job of drying and curing the pack in the first oven zone.

According to this invention, there is provided apparatus for heating fibrous mineral insulation material comprising an oven divided into zones, a conveyor for carrying the insulation material through the oven, means for directing hot gases into contact with the insulation material in the first oven zone, first heating means for heating the hot gases, and second heating means, distinct from the first heating means and positioned upstream from the first oven zone, for heating the conveyor. In a specific embodiment of the invention, the conveyor comprises an insulation contact surface and a framework, and the second heating means is adapted to heat the contact surface substantially without heating of the framework. In a preferred embodiment of the invention, the second heating means is an induction heater.
According to this invention, there is provided a method for heating fibrous mineral insulation material comprising carrying the insulation material through an oven divided into zones, heating gases with a first heating means, directing the hot gases into contact with the insulation material in the first oven zone, and heating the conveyor with a second heating means which is distinct from the first heating means and positioned upstream from the first oven zone.
In a specific embodiment of the invention, the conveyor comprises an insulation contact surface and a framework, and the second heating means heats the contact surface without substantial heating of the framework. BRIEF DESCRIPTION OF DRAWINGS
FIGURE 1 is a schematic cross-sectional view in elevation of the apparatus for heating fibrous mineral insulation material according to the principles of this invention. FIGURE 2 is a schematic cross-sectional view in elevation of the entrance vestibule and the first oven zone of the oven of Figure 1.

FIGURE 3 is a schematic isometric view of an oven flight of the oven conveyor.
BEST MODE OF CARRYING OUT THE INVENTION This invention will be described with reference to apparatus for curing fibrous glass insulation material, although it is to be understood that the invention can be practiced for heating, drying, or curing other heat softenable mineral materials, such as rock, slag and basalt. Referring to Figure 1 it can be seen that molten glass is supplied from furnace 10 via forehearth 12 to fiberizers 14. Veils of fibers 18 produced by the fiberizers are sprayed by binder applicators 16, and the fibers are collected as uncured wool pack 20. The binder can be a phenol formaldehyde binder, or any other type of binder. It is to be understood that the pack can be produced by alternate methods, many of which are known in the art. The uncured pack is then passed through oven 22 between top conveyor .24 and bottom conveyor 26. The oven is preferably a multi-zone oven and preferably contains an entrance vestibule and an exit vestibule. As shown, the oven in Figure 1 contains entrance vestibule 28 first oven zone 30, second oven zone 32 and exit vestibule 34. The uncured wool passing through the oven is dried in the first oven zone and then cured by the hot gases passing through the conveyor and through the insulation product. The cured insulation product exiting the oven is dried and cured insulation product 36.
Each zone of the oven can be adapted with a hot gas flow apparatus for forcing hot gases through the insulation product. As shown in Figure 2, the first oven zone is adapted with curing gas fan 38 for forcing the curing air into the oven. The gases enter the oven through any appropriate means, such as inlet duct 39. Any suitable means for heating the curing and drying gases, such as burner 40, can be used to raise the temperature of the hot gases. The gases are forced through the bottom conveyor, the insulation product, and the top conveyor, as indicated

1 by the arrows. The hot gases are removed from the first oven zone through outlet duct 41 by any suitable means, such as oven exhaust 42.
Any conveyor means suitable for carrying the 5 uncured pack through the oven, while enabling the flow of curing gases through the pack, can be used for the conveyors. The conveyors are mounted for travel through the oven on any suitable apparatus, such as wheels 52, and can be driven by any conventional means, not shown. As shown in 10 Figures 2 and 3, the conveyor belts can be comprised of a plurality of flights 44. The flights can be comprised of screens or perforated plates, such as insulation contact surface 46. Apertures 48 in the insulation contact surface enable the curing gases to flow through the flights and 15 through the insulation material. The flights also comprise non-perforated portions or framework 50 for providing the structure of the flight. Typically, the mass of the insulation contact surface will be a small fraction of the total mass of the flight. 20 In addition to the burner 40 for heating the curing gases, there is provided a second heat source, such as induction heater 54, for heating the flights of the bottom conveyor just before they contact the uncured wet wool. This second heating means can be any means suitable 25 for raising the temperature of the conveyor flights. For example, a gas burner could be employed. In a typical oven, the curing gases are delivered to the first zone at a temperature of approximately 260*0 (500°F). The bottom conveyor in a typical prior art oven enters the first zone 30 at a temperature of approximately 187.7°C (370°F). As the curing and drying gases flow through the bottom conveyor, heat transfer between the curing gases and the bottom conveyor raises the temperature of the bottom conveyor and lowers the temperature of the curing gases. As a result of _5this, the efficiency of the first oven zone is reduced. By raising the temperature of the flight at a position upstream from the first oven zone, this heat transfer within the

O 88/04760
first oven zone between the gases and the flights, is eliminated or at least reduced and the hot gases reaching the uncured wet wool will be at the desired temperature, near 260JC (500°F). By preheating the flights before they enter the first oven zone, the hot gases can dry the uncured wet wool faster and begin curing the wool sooner. It is believed that the addition of the preheating apparatus may be the equivalent of adding an entire oven zone in a multi-zone oven. The effect of flight preheating may increase the efficiency of the second zone also.
An additional feature is presented when the second heating means is an induction heater, such as induction heater 54. The induction heater can be adapted to merely raise the temperature of the insulation contact surface of the flights, without substantially raising the temperature of the framework 50. Since only a small fraction of the mass of the flight is being preheated, this saves a considerable portion of. the energy of the induction heater. Since most of the undesired heat transfer between the hot gases and a relatively cold flight occurs at the insulation contact surface, it has been found to be not as critical to heat the framework. Heat transferred from the hot gases to the framework is not that great due to the limited surface area of the framework. It has been found that the use of preheating equipment for the flights can enable a reduction in the gas temperature of the hot gases in both the first and second oven zones of a multi-zone oven.
The induction heater can be of any type suitable for heating the oven flights, many types of which are commercially available. An induction heater which has been used successfully is I.E.H. Company induction heater Model 2026, Hilliard, Ohio.
It is to be understood that the advantage of the invention can be taken either in reduced gas usage for the first and second oven zones, or in increased throughput by increasing the line speed of the wool passing through the oven, or a combination of the two.

The induction heater can also be positioned upstream from the wheels, such as induction heater 56 shown in phantom lines, to avoid applying heat to the area surrounding the wheels. INDUSTRIAL APPLICABILITY
This invention will be found to be useful in the formation of fibers from molten glass for such uses as glass fiber thermal insulation products and glass fiber acoustical insulation products.

Claims (6)

C L A I_ M S_

1. The method for heating fibrous mineral insulation material comprising carrying the insulation material through an oven divided into zones on a conveyor, the conveyor comprising a top conveyor and a bottom conveyor, directing hot gases into contact with the insulation material within the zones and thereby forcing the hot gases to flow either generally upwardly or generally downwardly through each of the zones, heating the gases with a first means for heating, and either a. ) heating the top conveyor with a second heating means distinct from the first heating means, where the second heating means is positioned upstream from the first oven zone in which the flow of hot gases is downward, or b.) heating the bottom conveyor with a second heating means distinct from the first heating means, where the second heating means is positioned upstream from the first oven zone in which the flow of hot gases is upward.

2. The method of claim 1 in which the second heating means heats the conveyor to a temperature approximating the temperature of the hot gases.

3. The method of claim 1 in which the conveyor comprises an insulation contact surface and a framework, and the second heating means heats the contact surface without substantial heating of the framework.

4. The method of claim 1 in which the second heating means is an induction heater.

5. The method of claim 1 including heating both the top and bottom conveyors with the second heating means.

6. The method of claim 5 in which the second heating means heats the conveyors to a temperature approximating the temperature of the hot gases.

AU10468/88A
1986-12-15
1987-09-16
Method and apparatus for heating mineral fibers

Ceased

AU586407B2
(en)

Applications Claiming Priority (2)

Application Number
Priority Date
Filing Date
Title

US06/941,659

US4734996A
(en)

1986-12-15
1986-12-15
Method and apparatus for heating mineral fibers

US941659

1986-12-15

Publications (2)

Publication Number
Publication Date

AU1046888A

AU1046888A
(en)

1988-07-15

AU586407B2
true

AU586407B2
(en)

1989-07-06

Family
ID=25476849
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

AU10468/88A
Ceased

AU586407B2
(en)

1986-12-15
1987-09-16
Method and apparatus for heating mineral fibers

Country Status (9)

Country
Link

US
(1)

US4734996A
(en)

EP
(1)

EP0293434B1
(en)

JP
(1)

JPH01501640A
(en)

KR
(1)

KR890700216A
(en)

CN
(1)

CN1011261B
(en)

AU
(1)

AU586407B2
(en)

NZ
(1)

NZ222882A
(en)

WO
(1)

WO1988004760A1
(en)

ZA
(1)

ZA877648B
(en)

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* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4831746A
(en)

1986-12-15
1989-05-23
Owens-Corning Fiberglas Corporation
Method and apparatus for heating mineral fibers

US20060057351A1
(en)

2004-09-10
2006-03-16
Alain Yang
Method for curing a binder on insulation fibers

EP2108006B8
(en)

2007-01-25
2020-11-11
Knauf Insulation GmbH
Binders and materials made therewith

BRPI0721232B1
(en)

2007-01-25
2023-01-24
Knauf Insulation Limited

COMPOSITE WOOD PLATE

BRPI0721234A8
(en)

2007-01-25
2017-12-12
Knauf Insulation Ltd

MINERAL FIBER BOARD

GB0706144D0
(en)

2007-03-30
2007-05-09
Knauf Insulation Ltd
Curing oven for mineral wool mat

CN102115937B
(en)

2009-12-30
2013-03-27
宁波荣溢化纤科技有限公司
Preparation method of ultrahigh molecular weight polyethylene (UHMWPE) short fibers

CN103025778B
(en)

2010-05-07
2015-09-30
克瑙夫绝缘私人有限公司
Carbohydrate polyamines tackiness agent and the material prepared with it

EA025774B1
(en)

2010-05-07
2017-01-30
Кнауф Инзулацьон
Methods of making fibers bound by cured polymeric binder, composition and composite wood board

GB201206193D0
(en)

2012-04-05
2012-05-23
Knauf Insulation Ltd
Binders and associated products

FR2994201B1
(en)

2012-07-31
2014-08-08
Saint Gobain Isover

PROCESS FOR COOKING A CONTINUOUS MATTRESS OF MINERAL OR VEGETABLE FIBERS

PL2928936T3
(en)

2012-12-05
2022-12-27
Knauf Insulation Sprl
Binder

ITMI20130114A1
(en)

2013-01-25
2014-07-26
Stefano Cassani

TREATMENT PLANT FOR PARTICULAR MATERIAL

PL3102587T3
(en)

2014-02-07
2019-01-31
Knauf Insulation, Inc.
Uncured articles with improved shelf-life

GB201408909D0
(en)

2014-05-20
2014-07-02
Knauf Insulation Ltd
Binders

EP3274279A4
(en)

2015-03-27
2018-11-14
Charles Douglas Spitler
Skin stiffness characteristics and loft control production system and method with variable moisture content in input fiberglass

SG10201502704VA
(en)

2015-04-07
2016-11-29
Singnergy Corp Pte Ltd
Apparatus and method for improved evaporation drying

GB201517867D0
(en)

2015-10-09
2015-11-25
Knauf Insulation Ltd
Wood particle boards

GB201610063D0
(en)

2016-06-09
2016-07-27
Knauf Insulation Ltd
Binders

DE102016122965A1
(en)

2016-11-29
2018-05-30
Autefa Solutions Germany Gmbh

Textile fiber drying

GB201701569D0
(en)

2017-01-31
2017-03-15
Knauf Insulation Ltd
Improved binder compositions and uses thereof

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* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US2997096A
(en)

1957-05-16
1961-08-22

Owens Corning Fiberglass Corp

Multiple stage methods and apparatus for curing the binder of fibrous glass masses

US4490927A
(en)

1982-05-03
1985-01-01

Owens-Corning Fiberglas Corporation

Apparatus for curing fibrous mineral insulation material

AU8025887A
(en)

1986-09-05
1988-03-24

Baker’s Pride Oven Co., Inc.

Conveyor oven design and method for using same

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(en)

1946-01-25
1952-03-25
Jr Charles L Cornelius
Cork bonding process

FR76123E
(en)

1956-05-11
1961-09-15
Saint Gobain

Webs, sheets or shaped pieces of glass fibers or similar mineral materials, agglomerated, and process for their manufacture

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(en)

1959-11-03
1962-12-25
Du Pont
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(en)

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1980-03-11
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(en)

1980-08-25
1982-04-27
Owens-Corning Fiberglas Corporation
Method and apparatus for curing fibrous mineral material

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(en)

1982-09-28
1984-04-16
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Plastic filter cloth has porous fused-fibre backing layer – with needled higher m.pt. fibre layer heat-treated in belt calender

1986

1986-12-15
US
US06/941,659
patent/US4734996A/en
not_active
Expired – Lifetime

1987

1987-09-16
JP
JP63500435A
patent/JPH01501640A/en
active
Pending

1987-09-16
EP
EP88900158A
patent/EP0293434B1/en
not_active
Expired – Lifetime

1987-09-16
WO
PCT/US1987/002346
patent/WO1988004760A1/en
active
IP Right Grant

1987-09-16
AU
AU10468/88A
patent/AU586407B2/en
not_active
Ceased

1987-10-12
ZA
ZA877648A
patent/ZA877648B/en
unknown

1987-12-05
CN
CN87107272A
patent/CN1011261B/en
not_active
Expired

1987-12-11
NZ
NZ222882A
patent/NZ222882A/en
unknown

1988

1988-08-13
KR
KR1019880700978A
patent/KR890700216A/en
not_active
Application Discontinuation

Patent Citations (3)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US2997096A
(en)

1957-05-16
1961-08-22
Owens Corning Fiberglass Corp
Multiple stage methods and apparatus for curing the binder of fibrous glass masses

US4490927A
(en)

1982-05-03
1985-01-01
Owens-Corning Fiberglas Corporation
Apparatus for curing fibrous mineral insulation material

AU8025887A
(en)

1986-09-05
1988-03-24
Baker’s Pride Oven Co., Inc.
Conveyor oven design and method for using same

Also Published As

Publication number
Publication date

KR890700216A
(en)

1989-03-10

AU1046888A
(en)

1988-07-15

US4734996A
(en)

1988-04-05

WO1988004760A1
(en)

1988-06-30

NZ222882A
(en)

1989-07-27

ZA877648B
(en)

1988-06-29

EP0293434A1
(en)

1988-12-07

EP0293434B1
(en)

1991-06-26

CN1011261B
(en)

1991-01-16

JPH01501640A
(en)

1989-06-08

CN87107272A
(en)

1988-06-29

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