DE3906278A1 - Process and apparatus for bonding profiles - Google Patents

Abstract

Profiles are bonded to one another, in particular at an angle with respect to one another, by providing them with cut faces at the bonding point, placing a bonding film against the cut faces, heating the bonding film with the cut face region of the profile parts and pressing the profile parts together in such a way that a firm bond of the profile parts takes place over their cut faces and the bonding films inserted in between. For this purpose, there is provided in particular a film feeding member, which introduces the bonding films into the interspace between the cut faces arranged at a distance from each other, in particular parallel to each other. A heating device heats not only the bonding films inserted there but also, via the latter, the regions of the profile parts bounding the cut faces. <IMAGE>

Description

The invention relates to a method and a device device for connecting profiles, in particular corner connections sealing profiles for windows, doors or the like, the genus mentioned in the preamble of claim 1.

Such a method and such an apparatus are already known (DE-OS 24 53 321). This becomes a band-shaped Profile part made of a thermoplastic elastomer plastic severed at one point with a cutting knife, so that a cut surface is created. Between this cut surface and a cut surface of another end of the profile part a hot plate is attached to which the two cutting surfaces Chen be created so that the end regions of the profile part be plasticized. After removing the heating plate The space between the cut surfaces is shown in brought into direct contact and compressed so that weld the ends together when cooling.

In addition, it is known (DE-OS 30 24 736), not only one and the same profile part with its own ends to one Ring to connect, but two separate profile parts with oblique cut ends at right angles to each other tie by using an elongated PVC profile part cut out a middle part with the help of a knife head is, the cutting knife to a temperature between 100 and Are heated to 180 ° C, so that the cut areas are forced  be heated frequently. Then pairs of holding jaws for the profile parts folded so that the warm The cut surfaces lie against each other and when cooling down with merge. In a similar known device (DE-GM 81 34 196) are the heated cutting knife in Distance from each other while the profile parts to be connected at right angles to each other and at an angle of 45 ° are arranged to the separating knives. After making the warm The cutting jaw pairs become one on top of the other moved until the cut surfaces meet and through Cool the two profile parts together at the cut surfaces the merge.

Finally, it is also known (DE-PS 30 38 122), the cut surfaces of rubber mixtures that can be vulcanized Rotate profiles first by retracting a cutter head the circular knives and then after heating through a heating mirror retracted into the space by joining together press and cool to melt.

However, it has been shown that the connection to the cut areas due to the problems occurring during operation and assembly Forces are not sufficiently resistant. Use too the Injection Molding Process for Vulcanizing Chews Schuk profile parts through the use of a cyanoacrylate adhesive or a two-component adhesive between the cut surfaces has drawbacks from either a relatively large appara tive effort or relatively long "setting times", if not, as with cyanoacrylate adhesives, exactly matched to each other Cut surfaces are available, which is complicated for trained Profiles creates difficulties.

The invention has for its object the method or the device of the type mentioned with simple Means to improve that quickly become permanent  Connection of the two profile parts with relatively low Costs can be produced.

The invention is in claim 1 with respect to the method and characterized in claim 8 with respect to the device, and in subclaims and in the following description and the drawing are further developments of the invention speaks, described and presented.

According to the cut surfaces of both profile parts each created a connection foil and the connection fo lien and the profile parts behind or below heated to welding temperature in the area of the cut surfaces, whereupon the two profile parts with the inserted in between Connection foils in their plasticized or plastic Condition are compressed so that after cooling a good connection is established.

As a connecting film, one is particularly suitable: a mixture of a thermoplastic elastomer such as butyl rubber, polyisobutylene, styrene-butadiene rubber, isoprene Rubber, nitrile rubber or EPDM and natural rubber, and a thermoplastic polyolefin. Such Mixtures are already known per se (US Pat. No. 3,962,018) and already used for the production of layered laminates been an elastomeric bond between two layers, for example multilayer water seals, door seals or the like. This creates a liquid layer between the individual layers to be joined, which is why the mixture preferably in the extruded state between the layers to be connected is introduced. This over known method is however for practical use poorly equipped industrial companies easy to use.  

In the invention, it is recommended if the connecting film is unwound from a roll. But it can also be cut to length from a strip and the cut strip parts to the cut surfaces of the profile parts to be connected and then heated. The heating is preferably carried out by a heating device which has heating surfaces at the opposite ends and is introduced into the space between the two connecting foils when these are placed on the cut surfaces or brought into proximity to them. Since thin connecting foils with a foil thickness of the order of 10 µm and 100 µm are preferred, the cut surfaces are heated through the connecting foils. It has been shown that this indirect heating technique of the cut surfaces leads to a particularly favorable heat transfer, which after moving the heater out of the space and after bringing together and compressing the cut surfaces - with the softened connecting films inserted between them - using a pressure in the Order of magnitude of 0.1 to 1 MPA and cooling, a particularly good connection is achieved which has hardly any singularities which tend to tear open under high mechanical, in particular dynamic, stresses.

Especially when using EPDM for the profile parts it is recommended if the connecting film is a thermoplastic cal polyolefin has either polyethylene or polypropylene. For polyethylene, low pressure PE is high density of about 0.95 with molecular weights between about 50 and 500 × 103 especially advantageous. Isotactic is recommended for polypropylene PE with a density of approximately 0.9 and approximately the same molecular weight. Vinyl acetate copolymers are also considered thermoplastic polyolefin applicable.

Thermoplastic polyolefin should be in proportion to the elastomer in a larger proportion, between about 60 and 90, in particular 70 and 80 wt .-%, at about 10 to 40, in particular between 20 and  30 wt .-%, elastomer may be involved.

The elastomer preferably consists of 95 to 99% isobutylene and 1 to 5% isoprene.

In addition to these mixture components, other com components, especially tackifiers, for the connection foil are used, which preferably have a thickness between 50 and 200 microns.

Based on the drawing are particularly preferred training of the invention described below. Show:

Fig. 1 to 6 in a schematic representation of individual method steps as they are used in the method according to the invention;

FIGS. 7 and 8, two process steps in use of a preferred apparatus used in accordance with the invention in different process steps and

Fig. 9a to 9f, in turn, a preferred apparatus in difference union process steps in a simplified schematic representation, namely in the upper part respectively in plan view and the lower part respectively in front view.

Referring to FIG. 1, the ends of which are accommodated a single profile section 1 or of two different profile parts 1 in spaced relation below two separating knife 6, which are guided in direction of the arrow and along the direction indicated in broken lines cut lines (future sectional areas 2 'represents actuating) the profile ends Cut off which pieces of waste 1 ', so that according to Fig. 2 fresh cut surfaces 2 are formed at the ends of the profile parts 1 .

According to FIG. 3, thin connecting foils 3 made in particular of thermoplastic material or also of hardenable material (here in the not yet hardened state) are applied to these fresh cut surfaces 2 .

Subsequently, the two profiled parts 1 are thus areas on the heater 5 to a heater 4 as shown in FIG. 4 is applied, that the connecting foils 3 the space between the heating surfaces 5 of the heater 4 and the cut surfaces 2 of fill. The heating of the cut surfaces 2 then takes place through the connecting foils 3 with a slightly abrupt tem temperature gradient, so that the fresh cut surfaces 2 do not "burn out". In contrast, the mutually facing free end faces of the connecting films 3 according to FIG. 5 after the removal of the heating device 4 are most heated and therefore brought into the best "connection state", so that the profile dividing 1 a by the double position of the connecting film 3 according to FIG . 6 are particularly good and permanently elastically connected to each other when the two connecting cooling sheets are put under pressure 3 at least during a part of the Ab, as indicated by the arrows P.

The heating time (melting time) and the duration of the together pressens (upsetting time) depend on the geometry of the connection end profile parts and their composition and also from the type of connecting films used. In special cases it is even possible to place one on each cut surface created connection film only a single connection film to be used, provided that it is ensured that this is with the cutting surface of the other profile part to be connected in their warm state.

According to Fig. 7 the ends of two profile parts 1 are arranged between pairs of holding jaws 7 a clamped such that the profile is not changed when clamping configuration convenient. A clamping jaw ( 7 d of Fig. 9) is placed on the profile parts from above to hold the profile in the holding jaw 7 a . This is not shown in FIGS. 7 and 8, which represent schematic top views of the device.

Both sides can be moved in the direction of the arrow P , so that from FIG. 7 to FIG. 8 the distance between the pairs of holding jaws, that is to say the space between them, is reduced to zero.

The not clamped between holding jaws 7 a parts of the pro filteile 1 can also be based on scales 9 , of which a copy is shown in Fig. 7/8, the right-hand insertion of the relevant profile part 1 between the holding jaws 7 a and the scale Cutting to length easier. Both the scales 9 and the profile parts 1 are arranged at an angle of attack b of 45 ° with respect to the direction of movement P and therefore the direction of the relative movement of the pairs of holding jaws towards and away from one another, so that the profile parts 1 according to FIG. 8 under one Angle α from here 90 ° are aligned with each other. On the scales 9 can also be waived.

In operation, the profile support between the holding jaws 7 a is first retracted, as will be explained later. Then the profile parts 1 are inserted in the provided Ril len the holding jaws 7 a . Then jaws 7 d are lowered.

After clamping, it is ensured that the cutting knife 6 cut surfaces at the points indicated by broken lines of the future cut surfaces 2 '. Thereafter, connecting foils 3 are inserted into the space between the holding jaw pairs at a distance so that they cover the fresh cut surfaces. Then the heater 4 is also introduced in the direction of the arrow into the remaining space, so that its heat-radiating heating surfaces 5 first heat the connecting foils 3 and through this the cut surfaces 2 . It is recommended that the mutually facing side surfaces of the connecting foils 3 be placed on the heating surfaces 5 during heating, since this results in the fastest heating in the shortest possible time.

After retracting the heating device 4 , both pairs of holding jaws are moved towards each other according to FIG. 8 in the direction of arrow P , so that the two heated connecting foils 3 are pressed against one another and against the cut surfaces 2 of the profile parts 1 to be connected. Depending on the configuration of the cross-sectional profile of the profile parts 1 and the material and the material of the connecting foils 3 , a certain pressure is maintained for a certain period of time until the parts to be connected are mechanically sufficiently attached to one another to ensure a firm connection of the profile parts 1 - here a corner connection of window frame profile seals - to guarantee. It is recommended to use a temperature of the heating surfaces 5 between 150 and 300 ° C. and a contact pressure of P = 0.1-1 MPa for a period of t = 10-30 sec.

In Fig. 9a, the state of a connecting device according to the invention is shown in the initial state when not yet inserted connecting Profiles 3. Along two horizontally next to each other round guide rods 16 , the upsetting slides, consisting of the retaining jaw carriers 10 and the retaining jaws 7 a , both can be moved in the direction of movement P , with the aid of the drive elements 14 (in particular pneumatic cylinders), the piston rods 8 of the upsetting slides one on top of the other move towards and away from each other. The upsetting carriage is provided with a clamping device with clamping jaws 7 d , which, in contrast to the horizontal direction of movement P in the vertical direction of movement V from the position shown in FIGS . 9a, 9b, can be moved into the clamping position shown in FIG. 9c, around the clamp parts not shown here between themselves and the holding jaws 7 a .

The profile support moves horizontally from the front between the compression slides. The heating device 4 and the cutter head 6 a with the parallel separating knives 6 are arranged on two superposed slides which can be moved out of the machine body parallel to one another, and the heating device 4 on the lower slide. The cutter head 6 a with the cutting blades 6 is located on the upper slide. To the right and left of the upper slide there is a film feed member 12 , each of which can be raised and lowered by means of a pneumatic cylinder.

After the additional profile supports 11 are retracted into the space between the holding jaws 7 a along the plane of the work table 13 in the horizontal direction H according to FIG. 9 b, the two profile pieces are machined into the respective groove adapted to the profile in the holding jaws 7 a and Pro 11 inserted so far until the two ends meet between the profile supports 11 at only one corner. The profile supports 11 on the profile support carrier 11 a support over the holding jaws 7 a inwardly projecting free profile ends (according to FIG. 7, the waste pieces 1 '), so when attacking the separating knife 6 and therefore when making the cut surfaces 2 according to FIG. 9c the profile of the pro filteile 1 is not squeezed and clean cut surfaces can be produced and a clean miter cut is also possible. When cutting, the cutting knives 6 are not heated, but in the cold state, which also favors the cutting while producing good cutting surfaces. In this case, the cutter head 6 a shown in FIG 7 is. 9c, upper part, first in the horizontal direction H, and then in the vertical direction V, as shown in FIG. 9c lower part, baking in the space between the holding in a moved. After cutting, the Profilab support 11 according to FIG. 9d, upper part, is pushed out again in the horizontal direction H. Likewise, the cutter head 6 a in vertical direction V Fig. 9d lower part is lifted, then transferred to the upper slide and retracted into the machine body in the horizontal direction ( Fig. 9d upper part), while at the same time the film feed member 12 ( Fig. 9d, lower Part) is lowered.

The L-shaped movement of the cutter head 6 a has the great advantage that the work area above the profiles to be cut is free, so that there is no risk of injury to an operator by the cutter 6 . Simultaneously with the horizontal retraction of the cutter head 6 a via the upper slide, the film feed member 12 according to FIG. 9d, lower part, is lowered so that the connecting films 3 abut the cut surfaces 2 . The heating device 4 is then pushed out of the machine body between the holding jaws 7 a via the lower horizontal slide valve. The connecting foils 3 are now in the space between the cut surfaces 2 and the heating surfaces of the heating device 4 . It is recommended if the connection foil 3 referred to as “welding foil” is applied to the respective cutting surface 2 on the one hand and to the respective heating surface 5 on the other, which is achieved by further merging the compression sled (consisting of holding jaw carrier 10 and holding jaws 7 a ) in the direction of movement tion happens. Subsequently, the film feeder gan 12 is first lifted off and then the heating device 4 is retracted in the horizontal direction via the lower slide, while the cylinders of the compression slides are depressurized shortly beforehand. The now somewhat soft mass of the connecting film 3 is evenly distributed over the cut surfaces 2 .

The upsetting carriage is moved further in the direction of movement P to the position shown in FIG. 9e, in which the two connecting foils 3 abut one another and by cooling both their connection to one another and their connection to the ends of the profile parts 1 on the respective cut surfaces 2 takes place. For this purpose, the upsetting carriage is put under pressure in the direction of movement P by means of the drive units 14 (pneumatic cylinders).

After sufficient cooling, the jaws 7 d in the vertical direction V acc. Fig. 9f, lower part, lifted and then the compression sled according to FIG. 9f, upper part, again in the opposite direction, that is, in opposite directions from each other, so that the connection is not torn apart again. Now the two profile parts, not shown, can be removed from the device in the state connected to one another in the form of a corner. To lift the jaws 7 d serve clamping cylinders which are connected to the jaws 7 d via guided connecting rods 15 .

The connecting foils 3 each belong to a band wound into a roll, which is arranged on the foil feed member 12 . The film is transported at the time when the film feed elements 12 are lowered. Then the horizontal forward movement of the slide is converted into a circular movement via a gear attached to the respective film feed organ 12 via two racks introduced on the lower slide with the heating device 4 . This circular movement is now transferred to a profiled transport roller by means of a shaft, a toothed belt and two toothed pulleys.

The film strip is clamped between this and another transport roller profiled against one another. This Einrich device ensures that each new band is advanced to bring a connecting film 3 in position for the immediately following connection cut. The device can be controlled with regard to its movement, pressure application and heating cycle, in particular by means of a control program.

The heating device 4 consists in particular of a heating block in which the two heating surfaces 5 are kept at a distance by a heat storage mass.

Claims (20)

1. A method for connecting profiles, in particular corner connections of sealing profiles for windows, doors or the like, in which two profile parts are each clamped between holding jaws and clamping jaws and, in accordance with the desired type of connection, in particular mitred and the cut surfaces of the two profile parts are heated and at the compressed, the profile parts having the mutually facing cut surfaces and welded, characterized in that on the cut surface (2) of a profiled part (1) a compound film (3) and to the interface surface (2) of the other profiled part (1) also comprises a connecting film ( 3 ) are created so that the connecting foils ( 3 ) and the cut surfaces behind or below ( 2 ) are heated to welding temperature and that the compression of the two profile parts ( 1 ) while inserting the two connecting foils ( 3 ) between the cut surfaces ( 2 ) will come. 2. The method according to claim 1, characterized in that the connecting films ( 3 ) cut to length from a tape and the cut tape parts are applied to the cut surfaces ( 2 ) and heated. 3. The method according to claim 1, characterized in that the connecting film ( 3 ) is unwound from a roll. 4. The method according to any one of the preceding claims, characterized in that a material is used for the connecting film ( 3 ), which is a mixture of an elastomer with a proportion between 10 and 40 wt .-% and a thermoplastic polyolefin with a proportion between 60 and 90% and optionally tackifiers. 5. The method according to any one of the preceding claims, characterized in that the connecting film ( 3 ) at a temperature in the range between 150 and 300 ° C and under a pressure between 0.1 and 1 MPa with the cut surface ( 2 ) of the corresponding profile part ( 1 ) is connected. 6. The method according to any one of the preceding claims, characterized in that connecting films ( 3 ) with a film thickness between 50 and 500 microns are used. 7. The method according to any one of the preceding claims, characterized in that vulcanizable material for the profile parts ( 1 ) verwen det and the connection is made in the not yet fully vulcanized state thereof. 8. The method according to any one of the preceding claims, characterized in that a single connecting film is used instead of the two connecting films ( 3 ). 9. Apparatus for carrying out the method according to one of the preceding claims, in the holding jaws, in particular pairs of holding jaws and clamping jaws, for clamping each profile part and separating knife for separating protruding profile parts and for producing the cut surfaces and a heating device for heating the profile parts in the area of Cut surfaces and a pressure device for leading each other to hold the holding jaws and connect the profile parts in the area of the cut surfaces, characterized in that a film feed member ( 12 ) introduces the connecting films ( 3 ) into the area of the cut surfaces ( 2 ) of the two profile parts ( 1 ) and the heating device ( 4 ) heats the connecting foils ( 3 ) with the cut surfaces ( 2 ). 10. The device according to claim 9, characterized in that the holding jaws ( 7 a ) and clamping jaws ( 7 d ) are designed and arranged such that the profile parts to be connected ( 1 ) run at an angle of approximately 90 ° to each other and that two in Separating blades ( 6 ) arranged parallel to one another are used as a pair of blades of a cutter head ( 6 ') and produce cut surfaces ( 2 ) of the profile parts ( 1 ) which are parallel to one another. 11. The device according to claim 9 or 10, characterized in that the holding jaws ( 7 a ) and clamping jaws ( 7 d ) approximately at right angles to the cut surfaces ( 2 ) of the profile parts ( 1 ) are movable towards and away from each other. 12. Device according to one of claims 9 to 11, characterized in that a profile support ( 11 ) for supporting profile parts ( 1 ) between the particular pairs of holding jaws ( 7 a ) is movable. 13. Device according to one of claims 9 to 12, characterized in that the cutting knife ( 6 ) produce the cut surfaces ( 2 ) of the profile parts ( 1 ) in the relatively cold state. 14. Device according to one of claims 10 to 13, characterized in that the cutter head ( 6 ') horizontally out of the device and then vertically movable in the cutting direction. 15. The device according to one of claims 9 to 14, characterized in that the film feed member ( 12 ) above the cut surfaces ( 2 ) of the profile parts ( 1 ) is arranged and the connecting films ( 3 ) from above into the space between the cut surfaces ( 2 ) of the profile parts ( 1 ). 16. The device according to one of claims 9 to 15, characterized in that the film feed members ( 12 ) each have a roll holder for on rolled films. 17. The device according to one of claims 9 to 16, characterized in that the heating device ( 4 ) has two spaced heating surfaces ( 5 ) and in the space between the cut surfaces ( 2 ) of both profile parts ( 1 ) in and out this can be moved out. 18. The apparatus according to claim 17, characterized in that the particular pairs of holding jaws ( 7 a ) and clamping jaws ( 7 d ) in between the cut surfaces ( 2 ) of the profile parts ( 1 ) retracted state of the heating device ( 4 ) and in which between the Heating surfaces ( 5 ) of the same and the cut surfaces ( 2 ) of the profile parts ( 1 ) inserted state of the connecting foils ( 3 ) by a drive unit ( 14 ) until the connecting foils ( 3 ) are applied to both the cutting surfaces ( 2 ) and the heating surfaces ( 5 ) are movable towards each other. 19. Device according to one of claims 9 to 18, characterized in that the film feed member ( 12 ) has a feed member for feeding the connecting film ( 3 ) into the active position. 20. Device according to one of the preceding claims, characterized in that at least one profile support ( 9 ) has a scale.