Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
  • B60J10/00—Sealing arrangements
  • B60J10/70—Sealing arrangements specially adapted for windows or windscreens
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
  • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
  • B29C48/154—Coating solid articles, i.e. non-hollow articles
  • B29C48/155—Partial coating thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/30—Extrusion nozzles or dies
  • B29C48/302—Extrusion nozzles or dies being adjustable, i.e. having adjustable exit sections
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
  • B60J10/00—Sealing arrangements
  • B60J10/20—Sealing arrangements characterised by the shape
  • B60J10/21—Sealing arrangements characterised by the shape having corner parts or bends

Definitions

• the present invention relates to a method for the extrusion on the marginal zone of a plate comprising at least one angle, in particular a glazing, of a profiled cord in the form of a frame, having a lip projecting from the plate, into an elastomer , using an extrusion die, the profiled bead being placed in an arc in the corner area.
• the invention also relates to an extrusion die for carrying out this process and to the product obtained.
• the known methods for the extrusion of a profiled frame comprising a centering and sealing lip projecting beyond the edge of the glazing in which, in general, a robot guides the extrusion head to the periphery of the glazing or where a robot moves the glazing in front of a fixed extrusion head, can be executed without difficulty, as long as the glazing or such shaped objects of plates, which are provided with the profiled frame, have rounded corners or a radius of at least about 20 mm.
• the known machines must then, if the extrusion speed must still be economical, deposit in the corner areas the profiled bead in an arc, the axis of the profiled bead then describing an arc of a radius of about 20 mm.
• the sealing lip directly in the angle would no longer extend beyond the edges, but would follow an arc inside the angle.
• the peripheral lip the function of which is to bear on the bodywork all around the glazing, could not fulfill its function.
• the frame is completed by a method similar to the injection molding process.
• the marginal area to be completed is inserted into an injection mold, and a suitable polymer is injected into the injection mold and hardens in the mold.
• This process has proven its worth, but is however linked to additional labor costs due to the additional process steps required.
• the object of the invention is to improve the process mentioned at the beginning of this specification so that the lip projecting beyond the edge of the glazing is extended or completed in specific areas of the frame, without an additional process step. is not necessary.
• an extrusion die comprising an elongated slot and a slide closing the end of the slot and that the slide is moved on command in a radial direction during the extrusion of the arc of a circle in the corner of the plate.
• the process according to the invention is therefore based on the use of an extrusion die with a variable die cross section, by the controlled modification of which the width of sealing lip in the corner area is continuously modified as desired in the area concerned and, in the case of a sharp angle, in which the lip is lengthened before reaching the angle and is then shortened again continuously to the initial length.
• the frame completely extruded during the extrusion operation in such a way that a post-molding of the sealing lip, especially in the areas of angle is no longer necessary.
• the method according to the invention can be carried out in principle in the case of extrusion using an extrusion die carried along a stationary plate as well as using a die extrusion arranged in a fixed manner, at the level of which the glazing is moved.
• the controlled displacement of the slide for lengthening and shortening the slot can be achieved in different ways.
• the slide can thus, for example, be provided with an electric or pneumatic drive, which is controlled by the central microprocessor of the installation.
• the slider can also be coupled to a lateral guide roller, which rolls on the peripheral surface of the plate to be provided with the profiled frame and moves the slider in the desired way, in particular when angle bypass.
• Figure 1 shows a corner area of a glazing unit comprising an extruded frame according to the state of the art
• Figure 2 shows the corner area of a glazing according to Figure 1, but with an extruded frame according to the method of the invention
• Figure 3 is a side elevational view of an extrusion head driven by a robot comprising an extrusion die according to the invention during the extrusion operation
• Figure 4 is a schematic view of the extrusion operation in the corner area of the glazing.
• the process of the invention can, of course, also be used in the case of the extrusion of profiled frames on other objects, such as, for example, metal plates, doors, trunk lids, etc. as far as these objects also have the need to modify the width of the lip, in particular when they have one or more sharp angles and the profiled frame is provided with a profile segment projecting beyond the edge of the object .
• the glazing 1 shown in the drawings has a sharp angle 2 in the corner area, in this case an angle with a value of 90 °.
• Certain automobile windows are sometimes configured so as to present such a sharp angle, while their outline for the rest describes curves having a greater or lesser radius.
• Such forms of glazing are often found in fixed rear side glazing. Glazing with two sharp angles is often used for automobile rear windows; in this case, the two lower corners are usually in the form of sharp angles, while the two upper corners are more or less strongly rounded.
• glazing all of whose corners are right angles, is used. The process according to the invention can be used in all these cases.
• a layer 3 in the form of a frame of an opaque material as a rule a baking ink. This is generally baked in the surface of the glass during the heat treatment to which the glazing is subjected with a view to bending and / or tempering.
• the profiled frame 4 is then extruded onto this layer 3 on the glazing at the level of the marginal zone of the glazing 1.
• the profiled frame 4 has a base segment 5 and a wing 7 extending perpendicular thereto.
• the sealing lip 8 projecting outwards beyond the edge of the glazing is connected to the wing 7.
• This profile segment 5 is applied, during the mounting of the glazing, the mass of adhesive with which the glazing is glued to the fixing edge of the window frame of the bodywork.
• This profile segment 5 can also, in principle, have another cross section; if necessary, this base segment 5 can also be completely removed and the adhesive mass is then directly deposited on the glazing, preferably on the opaque layer 3.
• the die extrusion in its relative movement to the periphery of the glazing must describe in the corner a circular path, along which the axis of the profiled bead describes a curve of radius R, of dimension at least about 20 mm.
• the outer side 10 of the lip will also thus describe an arc of a circle around the same center of a circle with the consequence that, from the start of the rotation of the extrusion die, the lip part 8 protruding beyond the edge of the glazing will shorten.
• the lip 8 does not even extend at all to the edge of the glazing. The phenomena are the same if the edge of the bay has a meander whose edge of the glazing does not have the equivalent, then the lip deviates or approaches the body unduly.
• a suitable shape of the lip 8 is obtained and, in the case of a wedge, as it appears in FIG. 2. Since, in the angle zone, the pivoting movement of the extrusion die and its movement along a circular path remain in principle unchanged, the shape and shape of the profile segments 5 and 7 are, in principle, the same as in the case shown in Figure 1.
• the length I of the sealing lip 8 projecting outwards increases however continuously, from the point where the circular and rotational movement of the extrusion die begins, until the extrusion die has traversed half of the arc of a circle. At this point, the lip 8 has the length L.
• the length of the lip 8 decreases continuously, until it has again reached its original length I at the end of the circular arc.
• the lip 8 now has in the corner area of the glazing the shape as shown in FIG. 2, that is to say that the part of the lip protruding beyond the edges of the glazing also extends into the corner area parallel to the edge of the glazing, and only the extreme outer corner of the lip is somewhat rounded.
• Figure 3 is a side elevational view of an extrusion head for the manufacture of the extruded profile frame according to the invention.
• the extrusion head comprises, inter alia, the die body proper 14 comprising the calibrated die orifice 1 5, the slide 1 6 being able to move horizontally and, in the case shown, where the extrusion head is controlled mechanically, a guide roller 1 7 connected to the slide 1 6, which rolls on the peripheral surface 1 8 of the glazing 1.
• the slot 1 5 ′ of the die orifice 1 5, forming the sealing lip has a length L, which is substantially greater than the length I of the sealing lip in the region of the longitudinal edges of the glazing.
• the slot 1 5 ′ is closed at its end by the slide 1 6 to the point that the free lip slot 1 5 ′, has in the region of the rectilinear longitudinal edges of the glazing, the desired length I.
• the slide 1 6 and the bearing 1 9 carrying the guide roller 1 7, which are fixedly connected to each other, are slidably mounted via a sliding bearing 20 on a horizontal guide rod 21.
• a pressing force is exerted by the helical spring 22 on the slide device connected to the guide roller 1 7, the guide roller 1 7 therefore being pressed against the peripheral surface 1 8 of the glazing 1.
• the attachment 23 carrying the guide rod 21 is rigidly connected to the extrusion head carrying the extrusion die.
• the extrusion die 14 is provided with two channels 26, 27 separated from each other, through which the polymer to be extruded is brought to the die orifice 1 5, 1 5 '.
• the volume flow rate of the polymer can be adjusted in the two channels 26, 27 independently of each other, as described in the document EP O 444 998 B1. Valves regulating the volume flow in the two channels
• volume flow rates are therefore adapted to the different mass requirements of polymer inside the die orifice during the rotation of the extrusion head.
• FIG. 4 shows in a plan view the sequence of movements of the die 14 and of the slide 1 6 during the extrusion of the profiled frame 4 in a corner area of the glazing 1. It is recognized that the guide roller 1 7 progressing on the peripheral surface 1 8 moves, during the pivoting movement of the die 1 4, outward in the direction of arrow F with the slide 1 6 coupled to the roller guide, the die slot 1 5 ′ forming the lip 8 being thereby progressively released continuously. As soon as the guide roller reaches the angle 2 of the glazing during the pivoting movement of the die 14 which continues, the direction of movement of the slide 1 6 reverses, whereby the die slot 1 5 'becomes shorter again continuously, until it has reached its final position at the end of the pivoting movement of the die 14.
• the method of the invention makes it possible to obtain a product, automobile glazing in particular, which comprises in the corners, a frame whose lip, as the rest of the cord constitutes a continuity with the neighboring linear parts.
• a product, automobile glazing in particular which comprises in the corners, a frame whose lip, as the rest of the cord constitutes a continuity with the neighboring linear parts.
• the connection between the new part molded in the corner and the parts of the neighboring extruded profile was visible except in the case where a cosmetic correction was made.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Seal Device For Vehicle (AREA)
• Securing Of Glass Panes Or The Like (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7784729

Family Applications (1)

Country Status (8)

Families Citing this family (12)

Family Cites Families (12)

• 1996
  • 1996-02-07 DE DE19604397A patent/DE19604397C1/de not_active Expired - Fee Related
• 1997
  • 1997-02-05 PL PL97322595A patent/PL322595A1/xx unknown
  • 1997-02-05 JP JP9528222A patent/JPH11503381A/ja active Pending
  • 1997-02-05 CZ CZ973172A patent/CZ317297A3/cs unknown
  • 1997-02-05 EP EP97904491A patent/EP0819050A1/de not_active Withdrawn
  • 1997-02-05 KR KR1019970707014A patent/KR19980703615A/ko not_active Application Discontinuation
  • 1997-02-05 BR BR9702069A patent/BR9702069A/pt not_active Application Discontinuation
  • 1997-02-05 WO PCT/FR1997/000226 patent/WO1997028947A1/fr not_active Application Discontinuation

Non-Patent Citations (1)

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