Method for manufacturing a pipe

Abstract

The present invention relates to a method for manufacturing a pipe, including: a rolling step of arranging a plurality of carbon threads such that the carbon threads tightly contact an outer surface of a mandrel; a heat-molding step of heating the mandrel in a furnace so as to compressively heat the carbon threads such that the latter are molded into a pipe; and a drawing step of removing a compression tape from the molded pipe, and separating the pipe from the mandrel.

1 . A method for manufacturing a pipe, the method comprising:
 rolling of arranging a plurality of carbon threads to tightly contact an outer surface of a mandrel;   taping of arranging a compression tape on an outer surface of the plurality of carbon threads arranged on the mandrel;   heat-molding of heating the mandrel in a furnace so as to compressively heat the carbon threads such that the compressively-heated carbon threads are molded into a pipe; and   drawing of removing the compression tape from the molded pipe and separating the pipe from the mandrel.   
     
     
         2 . The method of  claim 1 , wherein the rolling comprises:
 arranging the plurality of carbon threads in a form of a straight line on an outer circumferential surface of the mandrel in a lengthwise direction from one end to the other end of the mandrel; and   winding the carbon threads in a spiral form on the outer surface of the mandrel.   
     
     
         3 . The method of  claim 1 , wherein the rolling comprises:
 preparing a mandrel having grooves for forming patterns that are formed on an outer circumferential surface of the mandrel and extend from a lengthwise direction from one end to the other end of the mandrel and arranging a plurality of carbon threads in a form of a straight line so that the grooves for forming patterns of the mandrel are filled with the plurality of carbon threads; and   winding the carbon threads in a spiral form so as to cover the straight-line-shaped carbon threads.   
     
     
         4 . The method of  claim 2 , wherein an outer diameter of the mandrel increases gradually from one end to the other end, and
 the arranging comprises:   basic arranging of arranging the plurality of carbon threads in a form of a straight line on the outer circumferential surface of the mandrel in a circumferential direction of the mandrel at regular intervals; and   additional arranging of arranging a plurality of carbon threads from a point where a gap between the carbon threads arranged in the basic arranging is generated to the other end of the mandrel in a form of a straight line in the circumferential direction of the mandrel at regular intervals, and   the additional arranging is performed a plurality of times stepwise up to the other end of the mandrel until the gap between the carbon threads is filled.   
     
     
         5 . The method of  claim 2 , wherein the winding of the carbon threads in the spiral form comprises winding double-layer carbon threads in a spiral form in each of opposite directions in which the double-layer carbon threads intersect each other. 
     
     
         6 . The method of  claim 1 , further comprising:
 grinding an outer circumferential surface of the pipe separated from the mandrel; and   painting of coating the outer circumferential surface of the ground pipe with a color and waterproof liquid.