DE102010045956A1 - Heater box module for producing laminated safety glass, comprises upper and lower heating boxes, where heat is delivered by upper and lower infrared radiators into glass flow zone between boxes for two-sided heating of glass package - Google Patents

Abstract

The heater box module comprises an upper heating box (1) and a lower heating box (2), where heat is delivered by an upper infrared radiator (17a, 17b) and a lower infrared radiator (27a, 27) into a glass flow zone between the heating boxes for two-sided heating of a glass package. Each of the upper heating box and the lower heating box has upper and lower heating zones. One of the infrared radiators is provided with a first heating coil (6) and a second heating coil (7). The first heating coil covers a sector that is located on an edge of the glass flow zone. The heater box module comprises an upper heating box (1) and a lower heating box (2), where heat is delivered by an upper infrared radiator (17a, 17b) and a lower infrared radiator (27a, 27) into a glass flow zone between the heating boxes for two-sided heating of a glass package. Each of the upper heating box and the lower heating box has upper and lower heating zones. One of the infrared radiators is provided with a first heating coil (6) and a second heating coil (7). The first heating coil covers a sector that is located on an edge of the glass flow zone and occupies nearly half of the width of the glass flow zone. The second heating coil covers a sector that occupies nearly the entire width of the glass flow zone. The first and second heating coils are alternatively switched.

Description

The invention relates to a heating box module for the production of laminated safety glass, which has an upper and lower heating box, each having an upper and lower heating zone, of which heat is discharged by means of upper and lower infrared radiators in a glass flow zone between the heating boxes for heating both sides of a glass package therein.

For the production of laminated safety glass, a package of two or more slices, each with a lying between the slices of polyvinyl butyral (PVB) is constructed. In order to achieve a permanent bond between the superimposed components, the glass package must be subjected to various temperature and pressure treatments. For this purpose, various modules are present in a production plant, in particular roller presses and heating boxes. Thus, a production plant usually has a so-called "pre-bond". This can z. Example, serving as a preheating zone first heating box module, a subsequent first roll press, serving as Hauptheizzone second Heizkastenmodul and finally a second roll press. These modules of the precompound are successively passed through during the processing of the glass package.

In this case, a glass package is heated as it passes through the first heating box in the preheating zone so that the one or more films in the package assume a state which is referred to as "binding readiness". If the glass package now enters the first roller press, this state is used to push air out of the glass package. As the glass package passes through the second heating box in the main heating zone, heat is now introduced into the package in such a targeted manner that the one or more films reach the so-called "bonding temperature" of about 140 degrees. For this purpose, heat radiation is generated in the second heating box, which penetrates the glass layers and acts on the film or films. Advantageously, the wavelength of this radiation is matched to the maximum absorption capacity of the film used in each case in order to achieve rapid heating. The actual lamination of the thus prepared glass package can now be carried out in the second roll press.

In order to achieve the highest possible throughput speed of the glass packages and to ensure an optimal lamination result, the process parameters of each module of the "pre-assembly" must be as precise and constant as possible. In addition, a high energy consumption in particular for the operation of the Heizkastenmodule is required.

When assembling a glass package for a laminated safety glass occurs more often the case that this does not occupy the entire available width of the glass run-through zone of the "Vorverbunds". In addition to narrower glass packages may also be the case that a glass package is not rectangular, but z. B. has an oblique leg.

If such a glass package passes through a heating box module in the "pre-bond", all infrared radiators must be switched on in order to achieve heating of the glass package. However, since not the entire width of the pass is utilized, individual sectors are not covered with glass. The radiation emitted by the infrared radiators thus goes to nothing.

Since in such cases the radiant energy generated by the infrared radiators is not needed across their entire width for lamination of the glass pact, some of this radiant energy must be considered as a loss. In addition, overheating may also occur in the overhanging non-glass sectors of the glass flow zones. This can lead to damage during the passage of a narrower glass package, especially in its edge zones, z. B. to burn laminated films.

The object of the invention is to further develop a heating box module to be used in the production of laminated safety glass in such a way that the energy requirement during ongoing operation is reduced.

The object is achieved according to the characterizing part of claim 1, characterized in that at least one infrared radiator is equipped with at least two separate heating coils which cover different sectors of the glass flow zone. Advantageous further embodiments in the invention are specified in the subclaims.

In comparison with conventional infrared radiators, the infrared radiators according to the invention also have a closed, elongated glass body, at the ends of which electrical contact means are led out. In the interior of the glass body, however, two or more heating coils of different lengths are arranged parallel next to each other. Each heating coil is equipped with its own electrical contact means so that it can be selectively switched on or off. Depending on the spatial distribution of these heating coils along the glass body, the infrared radiation emitted by the infrared radiator can thus be influenced in a zonal manner.

With the use of infrared radiators, which are equipped with different lengths, separately switchable heating coils, the active radiation range can be optimally adapted to the widths of each to be processed and a Heizkastenmodul passing glass packages. Depending on requirements, heating coils are then switched on or off again by individual infrared radiators in required sectors. As a result, not only a considerable energy saving can be achieved. Rather, the temperature profile over the width of the glass flow zone can be made uniform and thus undesirable overheating in individual sectors can be avoided.

The invention and further advantageous embodiments thereof will be explained in more detail below with reference to an exemplary embodiment shown in those figures. It shows

1 the cross section through an exemplary, carried out according to the invention of the heating box module,

2 an exemplary, designed according to the invention infrared radiator with two separate heating coils, and

3 a longitudinal section through the exemplary Heizkastenmodul according to 1 with an infrared radiator according to 2 ,

In 1 is a schematic cross-section through an exemplary, executed according to the invention Heizkastenmodul H shown. This has an upper and lower heating box 1 . 2 on which on a floor frame 3 rest. Between the heating boxes 1 . 2 lies the actual glass flow zone D with one of the upper heating box 1 provided upper heating zone D1 and one from the lower heating box 2 provided lower heating zone D2. The glass flow zone is bounded on both sides by a first and second edge D3, D4, whereby the maximum glass flow width is determined. In the area of the lower heating zone D2 of the lower heating box transport rollers R are arranged for a continuous glass package.

The upper heating box 1 from 1 is equipped with a top radiator system from a series of infrared radiators. Exemplary are the two upper infrared radiators 17a . 17b highlighted. The upper heating box 1 is also equipped with an upper hot air system. This is in 1 only schematically shown and includes an upper nozzle 13 from a plurality of parallel juxtaposed hot air supply channels, which via an upper hot air blower 19 be supplied with hot air. This hot air can be inflated directly from the top of the surface of a glass package and causes a rapid, targeted heating. By way of example, the upper hot air supply duct 13a with the slot nozzle 13b highlighted for the escape of hot air.

The lower heating box 2 is basically structured accordingly. This is also equipped with a lower radiator system from a series of infrared radiators. Exemplary are the two lower infrared radiators 27a . 27b highlighted. The lower heating box 2 is also equipped with a lower hot air system. Also this is in 2 shown only schematically and includes a lower nozzle 23 from a plurality of juxtaposed hot air supply channels, which via a lower hot air blower 29 be supplied with hot air. This hot air can be blown directly from below onto the surface of a glass package and causes rapid, targeted heating. By way of example, the lower hot air supply duct 23a with the slot nozzles located on both sides of the transport roller R 23b . 23c highlighted for the escape of hot air.

The infrared radiators in the upper and lower radiator system can be equipped according to the invention with at least two separate and different length heating coils which cover different sectors of the glass flow zone. These are usually switched alternately.

This will be described below with reference to 2 and 3 explained using the example of a designed according to the invention infrared radiator, which is equipped for example with two heating coils.

So shows 2 the exemplary, designed according to the invention infrared radiator 17a in its glass body 5 two heating coils 6 . 7 are installed. This covers the first heating coil 6 a first sector S1, which lies at an edge of the glass passage zone D and occupies approximately half the width of the glass passage zone D. The second heating coil 7 covers the two sectors S1 and S2, which occupy approximately the entire width of the glass passage zone D. Also advantageous here are the first and second heating coil 6 . 7 alternatively switched.

If z. B. a narrow, only half the pass zone D entnehmendes glass package promoted by the Heizkastenmodul H, this is as shown in FIG 3 advantageous at the left edge D3 of the glass flow zone D on. In this case, only the left sector S1 must be irradiated, so that a connection of the first heating coil 6 of the infrared radiator 17a is sufficient. If now a glass package occupying the full width of the glass passage zone D is conveyed, the right-hand sector S2 must additionally be irradiated. In this case, the first heating coil 6 shut off and instead the second heating coil 7 switched on.

Of course, the number, length and arrangement of heating wires inside an infrared radiator can be selected differently. Thus, an infrared heater can be equipped with appropriate effort with three or more different lengths of heating wires. Also, this way, different, adapted to the shape and dimensions of glass packages to be processed divisions of the glass flow zone can be achieved in individual sectors.

The glass body 5 of in 2 shown infrared radiator 17a is on both sides by a first and second tail 51 . 52 completed. These are insulator sleeves 51a . 51b with electrical plug contacts on first end piece 51 , and corresponding insulator sleeves 52a . 52b with electrical plug contacts on second end piece 51 appropriate. Inside the glass body 5 becomes the first heating coil 6 from a first carrier bar 61 and the second heating coil 7 from a second carrier bar 71 held. At the ends go the support rods 61 . 71 about the versions 61a . 71a in the second first tail 52 and about the version 61b . 71b in the first tail 51 above. As already explained above, the first heating coil extends 6 about the sector 51 while the second heating coil 7 extends over the entire pass zone D, that is, the sum of the sectors S1 and S2.

LIST OF REFERENCE NUMBERS

H

Heizkastenmodul

1, 2

Upper, lower heating box

D

Glass Pass Zone

D1, D2

upper, lower heating zone

D3, D4

first, second edge of the glass flow zone

R

Transport rollers for the glass package

S1, S2

first, second sector

3

bottom frame

1

upper heating box

17a, 17b

upper infrared radiator

13

upper nozzle

13a

an upper hot air supply duct

13b

slot

19

upper hot air blower

2

lower heating box

27a, 27b

lower infrared radiator

23

lower nozzle

23a

a lower hot air supply duct

23b, 23c

slot dies

29

lower hot air blower

5

glass case

51, 52

first, second tail

51a, 51b

Insulator sleeves with plug contacts on the first end piece

52a, 52b

Insulator sleeves with plug contacts on second end piece

6, 7

first, second heating coil

61, 71

first, second carrier rod

61a, 61b

first, second version for connecting the first heating coil

71a, 71b

first, second version for connecting the second heating coil

Claims (3)

Heating box module for the production of laminated safety glass, comprising an upper and lower heating box ( 1 . 2 ), each having an upper and lower heating zone (D1, D2), of which heat by means of upper and lower infrared radiators ( 17a . 17b ; 27a . 27 ) in a glass passage zone (D) between the heating boxes ( 1 . 2 ) is emitted for heating both sides of a therein glass package (G), characterized in that at least one infrared radiator ( 17a . 17b ; 27a . 27 ) with at least two separate heating coils ( 6 . 7 ), which cover different sectors (S1, S2) of the glass passage zone (D). A heating box module according to claim 1, wherein the at least one infrared radiator ( 17a ) with two heating coils ( 6 . 7 ), wherein - the first heating coil ( 6 ) covers a sector (S1) which lies at one edge of the glass passage zone (D) and occupies approximately half the width of the glass passage zone (D), and - the second heating coil (S1) 7 ) covers a sector (S1 + S2) occupying approximately the entire width of the glass passage zone (D). A heating box module according to claim 3, wherein the first and second heating coils ( 6 . 7 ) are switched on alternatively.

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