Лако-красочные материалы — производство

Among different industrial branches and trades, a variety of test methods for the evaluation of adhesively bonded joints have been developed and established, including the ISO (International Organization of Standardization), EN (European Committee for Standardization) and/or ASTM (American Society for Testing and Materials) standards. While some test procedures require sophisticated equipment to assess the intrinsic […]

Besides the cost factor, one decisive parameter when assessing a manufacturing process is the process safety in terms of controllability and reproducibility. Hence, in order to select the correct technique it is crucial to know which parameters may influence the quality of the bonding. Failure Mode and Effects Analysis (FMEA) is an approach used to […]

Hybrid bonding makes it possible to take advantage ofthe mechanical and proces­sing characteristics of different joining techniques, to improve the quality of the joint, and to join specific materials and material combinations. When high-strength adhesives are used, the adhesive bond usually takes the greatest share of the mechanical load under service conditions. The mechanical fastener […]

The processing of film adhesives is particularly simple, accurate and clean if die — cut shapes are used (Figure 6.26). Structural film adhesives are available as nontacky films made from modified hot-setting epoxy resins or phenolic resins, respectively. Figure 6.25 Spraying of hot-melt adhesive. (Photo courtesy of Ellsworth Adhesives). Figure 6.26 Application of die-cut film […]

A wide variety of melting equipment is available for the processing of hot-melt adhesives, ranging from simple hand-held hot-melt stick dispensers to pneumatic cartridge dispensers or hot-melt drum — or tank-melters. If the molten adhesive is sensitive to oxidation, a shielding inert gas blanket can help to prevent decom­position. After processing, curing one-part hot melts […]

In particular, elastic polyurethane adhesives that cure under the effect of moisture are widely used in the automotive and building industries. The introduction of adhesives in automotive glazing (e. g. adhesive fitting of windshields) has provided a significant increase in the rigidity of the bodywork compared to the use of nonadhesive, rubber seals. Today, the […]

The curing reaction of two-part adhesives takes place after mixing at room tempera­ture, without any need to apply pressure. The adherents must be fixed to avoid movement of the adhesive joint before the cure is complete; this can be accomplished Table 6.1 Processing of physically setting adhesive systems according to their application forms and setting […]

During the creation of an adhesive bonded joint, all types of adhesive must undergo transition from the liquid to the solid state, except for pressure-sensitive adhesives (PSAs), which comprise both liquid and solid properties and thus have a permanent tack and adhesive bonding ability. Viscosity is a prerequisite of the adhesive to bring it and […]

The integration of bonding into a process chain, or the replacement of a mechanical joining technique by bonding, is a decision that must be taken if the cost-benefit ratio is to be favorable. Indeed, improvements in product characteristics, as well as increases in manufacture process productivity and quality must outrank the invest­ments effected in terms […]

Following extensive surface pretreatment, adherents with high surface energies and good adhesion properties show a great attraction for any type of contaminant within the environment. Therefore, if bonding cannot be performed directly after pretreatment, the use of a protective primer should be considered to avoid uncon­trolled recontamination or loss of wettability (see Section 5.10). 6.3 […]