Common bonding problems during the operation of DIN6701 bonding system

The common problems encountered during the operation of the DIN6701 adhesive system mainly include insufficient adhesive strength, cracking of the adhesive layer, detachment of the adhesive layer, unevenness of the adhesive layer, uneven color of the adhesive layer, non-compliance with design requirements during adhesive layer construction, and failure to cure the adhesive layer after construction. These issues usually involve multiple aspects such as train vehicle manufacturing, interior installation, and equipment maintenance. The causes and preventive measures are as follows:

Insufficient bonding strength: It may be due to poor quality of glue or adhesive, improper use, or improper storage leading to failure. The prevention and control measures include selecting adhesives that meet the standards, using them correctly according to the product manual, and ensuring that the adhesives are within their expiration date. ‌

Adhesive layer cracking: Due to the unsuitability of the bonding layer material for the shrinkage and expansion of the base material, or material shrinkage caused by changes in ambient temperature. The prevention and control measures include selecting suitable base materials and adhesive layer materials, considering the shrinkage and expansion coefficients of the base materials, and controlling the influence of environmental temperature changes. ‌

Adhesive layer detachment: due to uneven application of adhesive, unclean treatment of bonding surface, or immediate external force after construction. Preventive measures include ensuring even application of adhesive, thoroughly cleaning the bonding surface, and avoiding immediate external forces after construction. ‌

Uneven adhesive layer: Due to improper construction tools or unskilled construction techniques, the thickness of the adhesive layer is uneven. Preventive measures include using appropriate construction tools, training construction personnel, and ensuring uniform thickness of the bonding layer.

Uneven color of adhesive layer: due to uneven application of adhesive or impurities mixed in during construction. Preventive measures include ensuring even application of adhesive and avoiding impurities during construction. ‌

The adhesive layer construction does not meet the design requirements: due to insufficient understanding of the design intent before construction or failure to follow the design requirements during construction. Preventive measures include fully understanding the design requirements and strictly following the design drawings and construction specifications for construction. ‌

Failure to cure the adhesive layer after construction: Due to not curing or curing according to the adhesive requirements, the bonding strength did not meet the requirements. Preventive measures include curing treatment according to the requirements of the adhesive to ensure that the bonding strength meets the design requirements. ‌

In order to ensure the quality of bonding, in addition to the above prevention and control measures, it is also necessary to strengthen quality monitoring and acceptance during the construction process, promptly identify problems, and take measures for maintenance.

Yifa Bonding & Composite Research Institute is a leader in China's adhesive quality management system. For over a decade, Yifa has introduced adhesive standards such as EN17460/DIN6701 and ISO21368/DIN2304 into China. EN17460/DIN6701 adhesive quality management system is applicable to the rail transit industry, while DIN2304 adhesive quality management system is applicable to general industries outside the rail transit industry. After years of verification, the scale of EN17460/DIN6701 and DIN2304 adhesive quality system certification continues to expand. Yifa Bonding & Composite Research Institute has always been committed to helping China's manufacturing industry establish and improve technical standards in the field of adhesive applications. At the same time, through EAB training, EAS training, and EAE training, it has trained a large number of adhesive operators, technicians, and engineers in China, greatly enriching the domestic adhesive talent. Yifa Bonding & Composite Research Institute has been committed to helping improve the quality of adhesive sealing in various industries.