Abstract: The present invention pertains to a dual protection cap for a bolt and a nut. The present invention relates to a protection cap for a bolt and a nut, which is open at one side and covers a bolt and a nut so as to separate the same from the outside, and comprises: an outer cap and an inner cap are respectively injection molded with synthetic resin; fitting grooves, which are formed on the inside of the outer cap at a uniform interval in a longitudinal direction, are fitted and coupled with protrusion pieces, which are formed to protrude from the outer periphery of the inner cap at a uniform interval in a longitudinal direction; and triangular protrusion pieces are formed on the end portion of each of fixing pieces, which radially protrude from the peripheral surface of the bottom surface in the inner cap.

Abstract: Disclosed herein is a technology for adsorbing a liquid pine rosin containing a pine rosin which is a natural antimicrobial substance, in a fiber woven raw cloth (10) or a nonwoven raw cloth (20) or a sewed and finished fiber product (300), wherein the disclosed pine rosin adsorption apparatus may include a storing container (80) for storing a liquid pine rosin (30), a liquid adjusting unit (100) for adjusting the input amount of the liquid pine rosin (30), a sealed spraying device (90) for spraying the liquid pine rosin in cooperation with the storing container (80), and a cold and warm air blowing device (120) for vaporizing an ethanol (110) contained in the liquid pine rosin (30), wherein the raw material of the liquid pine rosin (30) is adsorbed into the natural or synthetic fiber woven raw cloth (10) or the nonwoven raw cloth (20).

Abstract: The present invention pertains to a dual protection cap for a bolt and a nut. The present invention relates to a protection cap for a bolt and a nut, which is open at one side and covers a bolt and a nut so as to separate the same from the outside, and comprises: an outer cap and an inner cap are respectively injection molded with synthetic resin; fitting grooves, which are formed on the inside of the outer cap at a uniform interval in a longitudinal direction, are fitted and coupled with protrusion pieces, which are formed to protrude from the outer periphery of the inner cap at a uniform interval in a longitudinal direction; and triangular protrusion pieces are formed on the end portion of each of fixing pieces, which radially protrude from the peripheral surface of the bottom surface in the inner cap.