DE8612217U1 - Plastic plate with a welding edge - Google Patents

Description

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Utility model registration G 86 12 21 7.7 Applicant R.R »Plastic

^^ Plastic plate with a welding edge

The innovation relates to a plastic plate with a welding edge which is in preparation for the Weld is formed with a profile, which when joining two plates under heat and The effect of pressure through fusing of material layers of these edges creates a weld zone with one-piece Gives strength properties.

It is known to weld edges of plastic to be welded "Fabric panels by means of radiation or convection" to be heated to the extent that they are to be fused • «. Edges a layer of molten plastic material • ir gives. Then the plates are joined together with these edges under the action of pressure and thus the Welding completed.

The material that flows into one another is the molten Layers swells out on both sides of the fusion joint and forms a more or less raised one Bead-like accumulation of material on the surfaces of the panels along the weld joint.

In order to counteract this phenomenon, which is undesirable in many cases, without the need for post-processing, it has already been proposed to break the top and bottom corner of the panel edges and

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thereby a V-shaped receiving space for the

Ι Welding joint to create weld metal that bulges out.

With a weld edge designed in this way, the disadvantages outlined above are only partially

; | however not really satisfactorily resolved.

¹ A Besides this with comparatively little labor

IJ effort-related method for welding

[| Plastic panels are still known to have this

similar to some metal welding processes with the addition of material to be welded with the weld seam formation progressing along the weld edges. ; Here, similar to the corresponding metal welding process, there is a V-shaped recess on the welding edges intended for the weld bead. ; But even with this comparatively much more complex Welding processes for plastic do not succeed, at least a connection without a visible weld seam to create on one side of the plate.

The innovation is based on the task of preparing a plastic plate with a welding edge of the weld with profiles in such a way that when joining two panel edges under heat and applying pressure to these edges by fusing layers of material to form a weld zone with one-piece Strength properties result, and where the welded joint can be produced at least on one surface without a visible weld seam. The shape of the room should be of the weld edges can be produced comparatively easily and inexpensively and are suitable for the

Carrying out a standard plastic welding process suitable without adding material.

The solution to the problem posed succeeds in the case of a plastic plate with a welding edge as described at the beginning named type with the innovation in that the profile of a welding edge with at least one projection and at least one cross-sectional shape having a recess is formed.

Due to the new three-dimensional shape of the welding edge, there is a great advantage in the area the neutral zone of the plates within the weld joint is a collecting zone for molten plastic material formed, which means that at least one surface side of the plates without a visible weld seam is weldable.

An advantageous embodiment provides that the profile is designed with an S-shaped cross-sectional shape is.

Further useful designs of the plastic plate with a welding edge are provided according to the features of claims 3 to 11.

The innovation is in schematises: · η drawings in preferred Embodiments ge ^ igt, wherein from the

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Drawings further advantageous details of the innovation can be found.

The drawings show in detail:

Figure 1 two opposing plastic plates with trained for welding Welding edges, in cross section;

FIG. 2 shows the plastic plates after welding with a weld joint, also in cross section;

FIG. 3 in a substantially enlarged for clarity Scale a welded edge like. 1, illustration on the left;

FIG. 4 shows a somewhat different three-dimensional shape of a welding edge with a meandering cross section.

As shown in FIG. 1, a plastic plate 6, 6 'with edges 2 and 3 to be welded is in preparation a weld with profiles 1,1 'formed, which when joining under heat and The effect of pressure through the fusion of superficial layers of material these edges 2, 3 form a material transition weld zone with one-piece strength properties result. For this purpose, the profile 1 or 1 'has a welding edge 2 or 3 in training

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according to the invention at least one projection 5 or 5 'and a recess 4 or 4'. As a result, an inner collecting zone 15 for molten plastic material is advantageously created in the area of the weld joint 14, as can be seen from FIG overflowing at least in the direction of the underside 16 of the welded plate-shaped elements 6, 6 ^r avoids. This results in a weld zone in the weld joint 14 without a visible weld seam on this underside 16. It is consciously accepted that a ter'.l of the molten material of the projections 5, V along the weld joint 14 when the plates 6, 6 'swells upwards and forms a weld 17, albeit comparatively small, but clearly visible, resting on the surface 10 of the plates 6, 6'.

As can be clearly seen from FIGS. 1 and 3, the profile 1 or I ^{1 is designed} with an S-shaped cross-sectional shape. This can be produced, for example, in a very advantageous and uncomplicated manner with a form milling cutter.

[As Figure 1 further shows, are in the erfindungsge

If the welding edge formation were to take place, the opposing profiles 1, 1 'of two to be welded together Plates 6, 6 'are designed to be symmetrical in opposite directions.

An optimal design of the welding edges is also achieved in that the S-shaped cross-sectional area 7 (Fig. 3) opposite the welding plane x-x with an outwardly protruding or with one inwardly recessed, each arch-shaped Bulge or indentation 5 and 4 is formed.

The arcuate AusK "w. Indentations 5 or. 4 preferably each have a semicircular cross-sectional shape.

The center Ml of the semicircular shape forming the indentation 4 is still essential to the innovation Return approximately at the level of the area of the neutral zone y-y and in the plane x-x, that of the neutral zone y-y transverse welding plane of a plastic plate 6, 6 'to be welded is provided. This results in under the semicircular recess ^, 4 of the to be welded Plate edge 2 or 3 a non-profiled area 8 of the plate edge to be welded 2 or which coincides with the plane x-x. Furthermore, the profiling of the welding edges is advantageously designed so that the distance A between the Center Ml of the semicircular recess 4 and the center M2 of the semicircular projection 5 corresponds to the diameter of a semicircle.

Furthermore, the profile 1 or I ¹ is advantageously designed on one of the welding edges 2 or 3 so that the contour lines 9 or 9 'of the profile 1 (Fig. 3) in

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the welding plane x-x with to the plate 6 or 6 ' run into parallel planes, with a KonGurlinie 9 of the projection 5 in the plane z-z of the plate surface 10 and the other contour line 9 of the projection 5 opens tangentially into the contour line 9 'of the recess 4 below.

The semicircular profile surfaces are advantageous here 11 or * 12 of a projection 5 or a recess 4 with the same area in relation to the plane x-x.

Although the S-shaped shown in Figures 1 and 3 Design of the welding edges 2 and 3 have proven extremely well in practice and accordingly an optimal solution to the initially presented

; Representing a task, there is also an arrangement

ι under the invention, as shown in FIG ' is

■ Here the profile 1 'is meandering or step-shaped educated.

Here, too, the profile 1 'of the meandering design according to the invention has a projection 5 ¹ and a recess' 4 ¹ in the welding edge formation. The profile edges 13 of the meandering profile I ^{1 are designed to be} broken with great advantage.

The formation of the plastic plates 6, 6 'with welding edges 2, 3 according to the innovation is very advantageously suited to an uncomplicated welding process without

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Carry out addition of material, with dutch fusing of material layers in the area of the edges when joining under the influence of heat and pressure a weld zone with integral strength properties is made * and where on a page 16, according to the Scheniatic representation in FIG. 2, no visible weld seam emerges from the weld joint 14.

The welding of the plastic plates is carried out in such a way that first the welding edges are profiled in accordance with the features of claims 1 to 11 by appropriate processing. This can be done, for example, with a form milling cutter without great effort and carried out in a semi-automatic or automatic milling device. Part of the material of the molten edge ^{layer flows into the inner collecting zone for molten plastic material formed by the profiles 1, I 1} pressed against one another approximately in the region of the neutral zone yy of the plate-shaped elements 6, 6 ¹ and, together with the remaining layers of the weld joint 14, forms a a virtually one-piece fusion connection. A little of the molten material formed in excess is pushed upwards and forms an albeit small visible weld seam 17, while in the area below the

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inner collecting zone 15 no weld quality del · weld joint 14 emerges. This therefore remains in accordance with the schematic representation in Fig. 2 without a visible weld seam and ends flush with the lower surface 16 of the plates 6, 6 '.

The welding of plastic sheets with according to the innovation formed welding edges is uncomplicated and meets high aesthetic demands. Because the design of the welding edges on the plastic plates according to the innovation an extremely satisfactory weld seam when joining two plates to be welded leads, and because the production of the welding edges can be carried out without major difficulties and costs, can therefore be spoken of as an optimal solution to the task set at the beginning.

Claims (11)

-Al- claims: 1. ZPlastic plate with a welding edge, this is formed in preparation for the weld with an edge profile, which is under the action of heat and pressure in two Plastic plates joined by fusing layers of material in the area of the welding edges results in a welding zone with one-piece strength properties, characterized in that that the profile (1) of a welding edge (2) or (3) with at least one projection (5) and a back> .ksprung (4) having a cross-sectional shape. 2. Plastic sheet according to claim 1, characterized in that the profile (1) with an S-shaped cross-sectional shape is trained. - A 2 - 4 * * * i * tittt 3. Plastic plate according to claim 1 or 2, characterized in that that the mutually opposing profiles (1, l ') of two plate-shaped to be welded together Elements (6, 6 ') are designed to be symmetrical in opposite directions. 4. Plastic plate according to one of claims 1 Las 3, characterized characterized in that the S-shaped cross-sectional area (7) opposite the welding plane (x-x) with an outwardly protruding or is formed with an inwardly recessed, respectively arcuate bulge or indentation (5 or 4). 5. Plastic plate according to one of claims 1 to 4, characterized in that the arcuate bulges or indentations (5 or 4) preferably have a semicircular cross-sectional shape. 6. Plastic plate according to one of claims 1 to 5, characterized characterized in that the center (Ml) of the indentation (4) forming the semicircular recess is approximately at the level of the Area of the neutral zone (y-y) and in the plane (x-x), the welding plane transverse to the neutral zone (y-y), one to welded plastic plate (6), and the area (8) located under the semicircular recess (4) of the -A3- ί · I · · ■ I · t · t · · ♦ Plate edges to be welded (2 or 3) with the plane (x-x) coincides. 7. Plastic plate according to one of claims 1 to 6, characterized characterized in that the distance (A) between the center (Ml) of the semicircular recess (4) and the Center (M2) of the semicircular projection (5) corresponds to the diameter of a semicircle. 8. Plastic plate according to claim 1, characterized in that the contour lines (9, 9 ¹ ) of the Porfils (1) in the welding plane (xx) with the plate (6, 6 ¹ ) open parallel planes, a contour line (9) of the Projection (5) in the plane (zz) of the plate surface (10) and the other contour line (9 ^{) opens tangentially into the contour line (9 1} ) of the recess (4). 9. Plastic plate according to one of claims 1 to 8, characterized in f characterized in that the semicircular profile surfaces (11) I or (12) refer to a projection (5) or recess (4), are equal in area on the plane (x-x). f - A 4 - £ ■ «Λ 4 * M Mtl * · ft Aft * · · t έ 9 · 4 · * M 4 · * # · ♦ ·» ti * 4 M * · * · -A4- 10. Plastic plate according to one of claims 1 to 9, characterized in that the profile (l) with a meander-shaped Cross-sectional shape is formed. 11. Plastic plate according to one of claims 1 to 10, characterized in that the profile edges (13) of the meandering profile (1) are broken *