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A novel cationic photosensitive resin (3DSLR-01) for stereolithography 3D printing was prepared with 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexane carboxylate (2021P), 1,4-cyclohexanedimethanol glycidyl ether (JX-026), diglycidyl 4,5-epoxycyclohexane-1,2-dicarboxylate (S-186), polycaprolactone polyol(Polyol-0305), novolac epoxy resin(F-51), bis(3-ethyl-3-oxetanylmethyl) ether (S-221) and a mixture of triarylsulfonium hexafluoroantimonate salts solution (UVI-6976). The properties of the photosensitive resin and its UV-cured films were investigated by some instruments and equipment. The experimental results show that the critical exposure (Ec) of the photosensitive resin is 16.3 mJ/cm2, the penetration depth (Dp) is 0.14 mm, and the optical property of the photosensitive resin is excellent. Rectangle plates were printed by using a stereolithography apparatus (HRPL-150A) with the photosensitive resin as the manufacturing material, and the shrinkage rates of the plates were less than 0.60%, which showed that the accuracy of the manufactured plates was very high. [ABSTRACT FROM AUTHOR]

Fire alarm causes and control measures in carding machine carding area were discussed. Combined with typical practical examples, fire alarm causes in carding area of high-yield carding machine were analyzed, mainly due to factors such as closer carding distance, tighter tooth distribution of card clothing, unreasonable correction gauge, worse sharpness of card clothing and excessive load on card clothing. It is considered that measures such as reasonable card clothing configuration and optimization of machine process are taken, problems can be effectively solved and safe production of carding machine can be ensured. [ABSTRACT FROM AUTHOR]