Method for sealing a flange fold

• Main Authors: MERZ, PETER W, BECKORD, VOLKER, SONNENBERG, KARL-HEINZ, BUCHER, PATRICIA, SCHMALBRUCH, JOERG
• Format: Patent
• Language: English; French; German
• Published: 04.10.2000
• Edition: 7
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; APPARATUS FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; BLASTING; CHEMISTRY; CYLINDERS; DYES; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; PAINTS; PERFORMING OPERATIONS; PISTONS; POLISHES; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SEALINGS; SPRAYING OR ATOMISING IN GENERAL; THERMAL INSULATION IN GENERAL; TRANSPORTING; USE OF MATERIALS AS ADHESIVES; WEAPONS

Es wird ein neues Verfahren für die Abdichtung von Karosserieabschnitten, insbesondere für die Bördelfalzversiegelung (5) von Fahrzeuganbauteilen, wie z.B. von Türen, Heck- bzw. Frontklappen oder Schiebedachdeckeln, beschrieben. Das erfindungsgemäße Verfahren beruht auf einer zweifachen Vorvernetzung (6,8) der Versiegelungsmasse (5) im Karosserie-Rohbau. Dabei wird in einem ersten Schrift die Oberfläche einer UV-aktiven Versiegelungsmasse (5) durch UV-Bestrahlung vorvernetzt (6), und in einem zweiten, direkt nachfolgenden Schritt wird durch thermische Einwirkung der Bördelfalzklebstoff (4) und die Versiegelungsmasse (5) angehärtet (8). Die durch das erfindungsgemäße Verfahren produzierten Anbauteile sind transportfähig und besitzen nach Durchgang durch die Reinigungsbäder und nach der Hitzehärtung im KTL-Ofen eine optisch und funktionell einwandfreie Qualität. Da die Versiegelung nicht wie heute im Lackierprozess, sondern im Karosserie-Rohbau durchgeführt wird, beinhaltet das erfindungsgemäße Verfahren ein erhebliches Sparpotential. To seal the folded bead edge (1) of a bodywork section such as a vehicle outer door panel (3), a sealing mass (5) is applied which is hardened by at least two different processes. One heating process has a photochemical action and the other has a therma hardening action which is a multi-stage heating. The photochemical hardening and/or the first stage of the thermal hardening stage is before the bodywork component is coate wetted, with a partial hardening before painting. One process hardens the outer surface of the sealing mass. The other process either hardens the contact zone between the sealing and the bodywork material or the inner zone of the sealing. The thermal hardening is applied by only partial heating of the bodywork material and/or at least outside a kiln for the first stage and especially by induction heating, infra red radiation and/or a hot air blower. The different hardening processes are separated by time gap of less than 2 hrs. Or the gap between the processes is less than 1 hr. and especially less than 20 mins. and pref. les than 5 mins. The selected hardening process can be in a kiln, induction heating, hot air blowers, photochemical hardening, and reactive final hardening without an energy supply. The different hardening processes give at least a surface (6) hardness to the sealing mass to allow it to be touched and gripped and/or resistant to washing out in a recirculating cleaning bath heated up to degrees C for degreasing the bodywork parts and/or phosphating and/or an electronic immersion painting and/or remaining in the o under tropical climatic conditions for more than three weeks. One of the initial hardening processes brings the sealing mass to solid state, especially where in contact with the bodywork, where optical faults such as air bubbles are firmly removed between adhesive (4) and the sealing in further process stages. The folded bead is preheated and the sealing mass is given an accelerate initial cross linking action by ultra violet radiation. The folded bead is preheated by a hot air blower shortly before the seal mass is applied. The folded bead sealing at the bodywork is treated with ultra violet rays and also heated together with the fol bead adhesive in an initial hardening action. The bodywork component is carried off and, after passing through at least one clea bath and paint spraying, for the sealing and paintwork to be passed together through a kiln, especially without optical or functional faults, for complete thermal hardening (8).