38results about How to "Prevent splitting" patented technology

The invention discloses a manufacturing process of a wood door, which is characterized by comprising preparation, sanding operation, colorizing and bottom rolling treatment, lamination, trimming treatment, assembling operation, decorative and shaping fastening piece installation and final entire packaging. The process prevents expansion and contraction in door vertical frame, cross beam and otherplaces. In the invention, the surface oil paint stripping and layering can be prevented by adopting half drying operation, paint spraying, a thermal leveling process and overall drying operation, time is saved and product quality is improved. At the same time, the invention also provides a half drying machine for half drying operation.

The invention belongs to the technical field of pesticides, and provides a mixed herbicide prepared from benzene carfentrazone-ethyl and thifensulfuron methyl and application of the mixed herbicide. The benzene carfentrazone-ethyl and the thifensulfuron methyl are taken as main effective components of the mixed herbicide; wherein the mass ratio of the benzene carfentrazone-ethyl to the thifensulfuron methyl is (1:900)-(900:1). The application of the mixed herbicide in weeding of a corn field, especially the application in prevention and weeding of various grass families, the sedge family and wide leaf weeds already unearthed or about to be unearthed, has a remarkable effect. Relative to a mono-agent, the herbicide delays the resistance of weeds, and is wide in weeding spectrum, long in lasting period and safe to corns under the premise of improving the pesticide effect.

The invention relates to a reinforcing steel bar and a processing method thereof, in particular to a high-strength reinforcing steel bar with spiral fins and a processing method of the high-strength reinforcing steel bar. The high-strength reinforcing steel bar consists of following components including, in weight percentage, from 0.25 to 0.4% of C, from 0.1 to 0.2% of Si, from 0.3 to 0.45% of Mn, from 0.04 to 0.05% of Nb, from 0.08 to 0.09% of Cr, from 0.01 to 0.04% of V, from 0.002 to 0.003% of B, from 0.001 to 0.003% of Mo, from 0.015 to 0.03 of Al, from 0.002 to 0.003% of S, from 0.008 to0.009% of Ti, from 0.004 to 0.005% of Ni, from 3 to 5% of composite rear earth and the balance Fe. The processing method includes using a roll to roll a reinforcing steel bar into a reinforcing steelbar with the continuous spiral fins on the surface in a hot state; feeding the reinforcing steel bar with the continuous spiral fins on the surface after hot rolling into a heating furnace and heating the reinforcing steel bar to the temperature of 880-990 DEG C; then fast cooling the reinforcing steel bar to the temperature of 650-680 DEG C by an online cooling device via compressed air or vaporous quenching liquid; quenching in a quenching device by water or quenching liquid for 15-25 seconds; and tempering after heating the reinforcing steel bar to the temperature of 500-550 DEG C via a tempering heating furnace. The high-strength reinforcing steel bar with the spiral fins has a good anchoring property, fine ductility and a high yielding-to-tensile ratio.