Jan Lambrechts - LCS Belgium
- 1. 息 袖-Joining 袖C 121206 121203 LCS Micro - Joining, the Adhesive Bonding Approach. Themadag Mikrocentrum Eindhoven 6 december 2012 LCS Belgium bvba, Consultancy in Adhesive Bonding Technology www.lcs-adhesivebonding.com Where its all about Introduction always with examples Bonding as alternative for What is bonding ? The theory Surface Treatment Methods External Influences Adhesive Types Design with Adhesives Examples including equipment and QC Conclusion NASA Spaceshuttle Heatshield vs Medical Needle PP to Inox Bonding: an alternative for Welding: Electric Arc Welding, Ultrasonic Welding, Laser Welding Soldering Screws, Bolts & Nuts Clinch-nails & Rivets Folding, Pressing en Flowdrilling Clasp constructions & Springs Sewing, Stitching & Stapling Advantages of Adhesives Easy & Fast: less rework Also for dissimilar materials e.g. metal-plastic & thick-thin Higher Strength: uninterrupted joint No or less weak points Improved Stress-distribution & -reduction Higher fatiguestrength Sealing: corrosion prevention Liquid- & gastight Damped Vibrations less Noise S&R Light: weight reduction Esthetic: invisible Bonding also Thin & Small components Less components袖 LCS Adhesive Bonding bvba Copyright 息 2012-06-07
- 2. Pseudo-disadvantages of Bonding Its Chemistry ! Its a mess !? = Operator dependent Environmental aspects: Water based adhesives Recycling of adhesive and cleaners Cleanliness of substrates Design flexibility: is manageable Speed: adhesive type dependent Dangers: exothermic reactions, H&S Difficult Disassembly: recycling Limited Strength & Temperature Resistance Sticking as a Gecko IFAM Subtle hairs with a molecular bond: van der Waals forces Whats Bonding ? Definition Joining of two substrates by means of a third medium = the adhesive Adhesion vs Cohesion LCS 100218 Copyright LCS 速 18 Whats Bonding ? Mechanisms (cfr Wikipedia) Vanderwaals: Glassplates experiment Chemical: Si primer Mechanical: Surface roughness But whats really on the Surface ?! Surface condition of substrates !!! Why Surface Treatment ? Strength: adhesion - cohesion ( rupture ) Wetting ( > 40 Dyne/cm) Contact Angle measurement Watertest Pretreatment of substrates Degreasing: cloth, vapour, ultrasonic Grinding: roughen = > surface Blasting: grit-, ice- . NON-recirculating ! Primers: silanes thickness = 袖m Chemical etch: bv Aluminium Flame & Corona: foil & sheet Plasma: vacuum & atmospheric CA! Laser: surface structure change Failure Types Cohesive failure: in the adhesive Adhesive failure: on the surface of at least one of the substrates Material Failure: one of both substrates Mixed Failure: a combination of the above LCS Adhesive Bonding bvba Copyright 息 2012-06-07
- 3. Failure Types Medical needles Cohesion failure: lack of cure Material failure: plasma treated + fully cured Surface Treatment with Atmospheric Plasma Video External Influences Time: aging degradation in function of time Temperature: -change en thermoshock under the hood: -55属 tot +125属 C C Vibrations & Shock: noise - S&R Chemical: salt + humidity = corrosion Radiation: X-ray, 留-, 硫-, 粒-radiation Radioactive Light: UV degradation color permanency Medical: USP Class VI ISO 10993 - sterilisation, biocompatibility, citotoxicity Adhesive Types - Graph Epoxy: highest performance, chemical resistant Polyurethane: humidty sensitive, cheap Silicone: flexible, price , Mix-Ratio, Visc f(T) Phenolics: high temperature applications UV & light- curing: fast, price , light sensitive Acrylates: highest strength, smell, initiators Cyanoacrylates: moisture cure Anaerobics: thread lock metal+ & air cut off Hybrids : EP/Si, PU/EP, UV + moisture or T Exotics: polybutadiene, MS-polymer, PSA, Hotmelts: cheap, reactive types, performance Tapes: single and double sided Ceramic : HT Waterglass Ink Cartridges Gas Filtration Heat Exchanger Solvent Based Adhesives Medical disposables: Stress Cracking Urgency repair of pantys: Acetone based nail remover Solvent alternatives Adhesive Types UV & LIGHT Curing Medical needles Glass & plexiglass structures CD DVD lens focus mechanism Carglass repair Jewelry Cristal clear Refractive index Non-yellowing Fast curing No oxygen inhibition not tacky Strong Health & Safety H&S - Thats why there are Safety Measures Design = alternative thinking Tensile - Trekbelasting Shear Afschuiving L&R Best for Bonding Applications Cleavage - Splijtbelasting Peel - Afpelbelasting Examples (contd) Tea bags Medical Needles en Catheters Curing of Adhesives - Timing Ra-ra-ra whats this ? Glucose Test Blood Tubes Detector in Toothbrush Modelbouw Balloon Catheder Pacemakers & Hearing Aids Surgical Glue & Dental Surgery Nageltrends Scanner Sensors CA Rubber Bonding CD/DVD Laser Motor Control LCS Adhesive Bonding bvba Copyright 息 2012-06-07
- 4. RFID Identification Systems SMD in Electronics Watch Mechanism with Chip Stacking Potentiometers Piezo Diesel Injection Piezoelectric Evaporation Device Biological Pest Control Shaver Blade Cover Dosing Equipment Volumetric XYZ 2K Nano dispensing equipment - 1 mm - 10 nl Chip Packaging in Micro-Electronics Fiber-Optics Quality Control with Vision System A: non Fluo B: non Fluo C: OK D: Defect A few Trends Multiple functionalities: Vibration dampening - S&R More composites and all-in adhesives Increasing Price pressure : Lopez effect - raw materials & energy price increases Nanotechnology in adhesives It all happens on the surface, less in the adhesive Selfhealing Adhesives More automation with adhesives More Bonding for your new Application Conclusion The only chance realising bonding projects successfully, is that the Triumvirate of the customer with his project the glue manufacturer with the adhesive the machine manufacturers with their equipment is working intensively and expertly together, from the design phase on and on all aspects of the application. Success Guaranteed ! Thanks for your attention, and we welcome you in The Adhesives World LCS Your partner in Adhesive Bonding LCS Adhesive Bonding bvba Independent Consultancy in Adhesive Bonding Technology Ing. Jan A. LAMBRECHTS MSc. Bergenstraat 84 B-3053 Haasrode Leuven +32-(0)16-38 90 45 +32-475-45 48 98 jan.lambrechts@consultant.com www.lcs-adhesivebonding.com 121203 LCS 息 袖-joining 袖C 121206 LCS Adhesive Bonding bvba Copyright 息 2012-06-07