DE2510638A1 - METHOD AND DEVICE FOR PRODUCING SYSTEMS WITH DOUBLE DISC - Google Patents

Description

ETiBLISSEMENTS GEORGES KIEIN 0069 75 B

Method and device for the production of systems with double pane.

The invention relates in particular to systems with double panes, in particular for window openings (as assumed below) those with sheets made of a thermoplastic material, e.g. methy! polymethacrylate of such Systems, the invention relates in particular, but not exclusively, to those for window openings of vehicles, especially by caravan trailers. The invention also has the methods and apparatus for manufacture of these systems. ;

It is already known to have two panels from one

Lay the transparent material on top of each other, them on their edges to be welded by a suitable heating effecting a softening of the material and at the same time a double pane by placing the two panels in the internal __nej? half of the_ so "welded" side stripes are not binding. Away-

509839/0707

- 2 - 0069 75 β 25Ί 0638

cut are spread apart, v / whether the plasticity resulting from the increase in temperature is also exploited.

The simultaneity of these work steps

forms a serious disadvantage, since to achieve a good weld at the edges there is a considerable increase in temperature is required, which is necessary for good visibility properties of the material in the one to be deformed, a double pane forming and limited by these margins section is harmful.

In general it can be said that for them Welding of the edges generally a temperature of the order of 200 ° C is required, which at their Applying to the whole tables the transparency of the same would make it disappear. The deformation of the panels, which is to give them their final shape, must be at lower Temperatures of the order of 100 to 160 C take place.

Take into account current practices

not these claims, what bad results or the distress I the need to use costly tricks.

The invention aims to avoid these disadvantages. I.

The inventive method for production

of systems with double panes, especially for window opening; openings of vehicles, with two transparent panels made of a thermoplastic material, which are previously welded at their edges by V / heat effect and then under the action · _; be so deformed by heat that they are affected by the action of a; pressure or negative pressure exerted on their surfaces are spread apart, is characterized in that the welding of the edges is carried out by heating limited to these edges to a high temperature of, in particular, of the order of 200 ° C, while the deformation of the panels for their spreading apart is carried out in particular by the action of a Pressure or a negative pressure at a considerably lower one; Temperature of the order of 100 to 160 C takes place. ;

The edges are heated beforehand! expedient on the inside, the "edges of the in suitable." Wise spaced panels. It has turned out to be;

609839/0707

'■ ff' lib on.

j shows that it is "better to achieve a seLp / result,

j above all to heat the surfaces which are to be welded to one another, ie the inner surfaces. In addition, f Every so ungewünsehte local action on the Hutζabschnitte the discs avoided "

Finally, the invention also relates to an embodiment in which the two panels are below the effect of an internally exerted pressure can expand freely, so that you finally get an arrangement in the form of a biconvex lens, which is shapely and very resistant.

The invention is referenced below explained on the drawing by way of example. } Fig. 1 diagrammatically shows the one to be opened

Part of a window according to the invention that opens outwards ! of a caravan trailer with double pane. i

j Fig. 2 to 4- show schematically, each in the transverse ''

\ cut and partly in side view, different successive work steps of the process for the production of these windows. j

Fig. 5 shows the "same system in one."

schematic top view and represents the mounting hinges dar. ι

The double disc system is essentially

formed by an arrangement of two panels made of a thermoplastic material, which initially united closely at their edges and then in the one remaining free within these edges Section deformed by introducing a gas under pressure with simultaneous suitable heating of the panels •will. ι

With regard to the union at the edges, it has been shown that the selected material is self-welding under a suitable pressure P if it has previously been brought to a suitable temperature T, which is preferably \

.should be of the order of magnitude of 200 ° C so that the edges: into a superficial j that enables welding

Softened state are brought. j

Assuming, for example, that the size of the

Panels is essentially rectangular, but this is only a case; game represents, since the panels have any other geometri-;

509839/0707

see, 3.B. square, polygonal (with sharp or rounded edges), circular, oval, elliptical shape, etc. can, therefore, there is the first step, as in Figs. 1 and 2 shown, in using local heating means acting on the edges in combination with a press frame, the shape of which corresponds to the general shape of the window to be produced.

First, as shown schematically in FIG. 2, the two panels 1 and 2 are arranged one above the other at a certain mutual distance d, one panel 1 resting, for example, on one, J, of the two elements 3> 4- of the above-mentioned press frame , while the other panel, 2, is held by suction heads 5 , and between the two panels are introduced at the location of the edges of the same heating elements, which one; Have a local effect on the surfaces to be welded '. can and are shown very schematically at 6 in FIGS. 2 and 3. These heating means can be formed, for example, by heating pipes (armored resistors, infrared pipes, etc.). These pipes' are in particular combined with one another and corresponding to the! precise outline of the adhesion zone to be produced. j

As a second step, after completion '_ of the above first working step and removal of the heating tubes (Fig. 3) applied to this peripheral strip a suitable pressure of, for example of the order of 5 to 10 kg / cm, and that j of the order of about during a suitable period of a minute . _ I

For this pressurization the two are

Elements 3 and 4 of the press frame used, which in j 3 are approached and subjected to a pressure j. Practice has shown that this pressing process in a warm state a kind of welding of the two envelopes! catching strip of the panels causes which then a single Edge A (Fig. 1 and 4-, 5) have.

If necessary, elements 3 and 4 of the Contain pressing frame heating and / or coolant. In this way, water can circulate after pressing the edge 1 to bring it back to room temperature quickly.

In the third step, the arrangement thus formed is taken up again, and the panels, i.e. the Double disc, are made by blowing a compressed gas between

S09839 / 0707

the free sections of the panels are shaped after these sections have been brought to a suitable temperature t to allow this deformation. This temperature is moderate and is on the order of only 100 to 160.degree. C., it being in particular between 120 and 160.degree. Also, will; Preferably, the panels during this process by its edge ■ A firmly held, so that this edge can not be deformed due to \ the deformation of the panels. j

Various approaches can be used to achieve these conditions,
j. So you can to clamp the edges A the

Pressing elements 3 »4- cLes previous operation joint Use means, or on the contrary various means, e.g., as shown in Fig. 4, through a rigid hollow Frame 7 are formed, which is designed so that the edge A in combination with pressure means, which this edge fixed hold, can be introduced. These pressure means are formed, for example, by an inflatable pneumatic tube 8 (Fig. 4).

In order to keep the panels at the desired temperature, either the entire arrangement can be placed in a chamber ' at a suitable temperature, or use heating means on both sides of the panels, e.g. radiators (infrared radiators etc.) 9 (Fig. 4). ;

For the injection of gas, which can be air or a neutral or other gas, the injection pressure of which is selected according to the format and the thickness of the material to be deformed, at least one injection hole 10 (FIGS. 3 and 4) can be used, for example, which is formed at the edge A between the panels and through which a needle or other device for injecting the gas is inserted; can. \

If the material used is somewhat hydrophilic, one can optionally provide at least a second hole, which is distant from the first possible and _include: allowing some circulation with a leakage flow, so that, inside fogging of the panels is avoided. j

The gas thus injected can be at room temperature, or at one to increase the ductility; of the panels contributing heating temperature. j

509839/0707

j If the desired deformation through this

i blowing in has been achieved, the arrangement is in any case removed from the ■ heating zone and brought into a cooling zone in which cooling can either take place freely or can be accelerated by forced ventilation.

After cooling has ended, the arrangement has a stable shape. They can then be removed from the press frame 7 pull out.

If, as provided in the illustrated embodiment, no deformation is prevented under the action of \ gas pressure is finally obtained an arrangement in the form of a bubble or a lens, which is apparent in particular from Fig. 1 and is advantageous for many reasons.

However, the invention is by no means based on these Case is limited and applies to any other possible forms as well. !

j If, for example, one of the panels is deformed '.

j, a double pane with a flat panel and a curved panel can be obtained. ?

In general, you can, if you set it up so that the panels are stretched against surfaces of suitable forms, obtain any desired form, the essential only being that the two panels be spread apart to form a rigid, lightweight isothermal array that does not exhibit any noticeable optical distortion results in j

The system according to the invention has compared to the: ' already known systems numerous advantages, in particular the following: ■ |

It's very easy to do. . ; It allows to obtain perfect products, in which the actual double pane retains its properties unchanged, in particular its transparency, because it is not brought to too high a temperature. j

It enables the production of any desired shape, since it is sufficient to use shapes or stops to provide against which the panels lay at the end of the stretching process, although the shape shown - the simplest and seems to be most effective. I.

509835/0707

- ? "- ~ öo69 75 β 25TÖ638 '

It should also be noted that the insertion of the double pane elements obtained in this way into the frame 11 (Fig.i) of the window openings is extremely simple. It is sufficient, for example, during the molding process of the type described above between the 'two strips of the edge strip A along one side of the toe. Order hinge ere elements 12 (Fig. 5) to use which how ^! usually form the hinge along the corresponding edge of the fixed frame of the window opening.

509839 / Ö707

Claims (11)

PATENT CLAIMS 1 · Process for the production of systems with Double pane, in particular for window openings in vehicles, with two transparent panels made of a thermoplastic material, which are previously welded at their edges by the action of heat and then deformed by means of heat in order to reduce the pressure or pressure exerted on their surfaces by the action To be spread apart under negative pressure, characterized in that the welding of the edges (A) takes place by heating limited to these edges to a high temperature of in particular of the order of 200 C, while the welding | shaping of the panels (1, 2) for spreading apart at a significantly lower temperature of the order of 100 to ^: 160 ° C takes place. 'j 2. The method according to claim 1, characterized in that the previous heating of the edges (A) on the inner j surfaces of the edges is made, for which the two panels be removed from each other beforehand. j 3. The method according to claim 1 unl2, characterized in that that if the tables, in a minor mutual Distance, heating means, e.g. heating pipes (6), are introduced between their edges, whereupon the panels (1, 2) approached each other and the edges (A) a pressure of the greatest 2 Ϊ normally 5 to 10 kg / cm. j 4. The method according to any one of claims 1 to 3 »i characterized in that after welding the edges (A) j and the exertion of a pressing pressure in a provisional framework '\ men (7), the arrangement is subjected to heating in order to j Bring panels to a temperature of the order of 100 to 160 ° G, whereupon air is introduced under pressure so that the two panels deform on both sides of the general plane of the frame and assume the general shape of a biconvex lens. 5. The method according to claim 4, characterized in, that the provisional frame (7) with the to make the Welding of the edge of the panels, serving frames (3, 4 ·) ge-l has common elements. j 6. The method according to claim 4, characterized 509Ö39 / 0707 net that the provisional framework (7) expressly for him
assigned function is provided. 7. The method according to claim 4, characterized in that the temporary frame (7) is an inflatable
Tube (8) for exerting pressure on the edges of the panels
contains. ! 8. The method according to any one of claims 1 to 7 »
characterized in that the panels during their deformation, in particular during their elongation under the action of a; blowing of gas, lie against mold elements, which give them
give it a special shape. J 9 · method according to one of claims 1 to 8,! characterized in that hinge elements (12) are used during the welding of the edges - of the two panels, j 10. The method according to any one of claims 1 to 9 produced j system with double glazing, characterized marked ¹ is characterized in that it has the general shape of a biconvex lens. j 11. System according to claim 10, characterized in that the circumferential edge (A) has the general shape of a rectangle Has. 509839/0707