Method of fabricating pipe units.

摘要

The method of fabricating a bundle-like pipe unit (3;103;203), using a blow molding machine (37;137;237) having a plurality of heads (4,5;104,105;204,205) feeding parison (14,16;114,116;215,217) into a molding die (39;139;239), comprises the steps of forming a plurality of hollows (8,9;108,109;208,209) independent from each other in the molding die (39;139;239), forming one or more channels (34;129;134;234) connecting the hollows (8,9;108,109;208,209) to each other laterally, feeding the parison (14,16;114,116;215,217) into the hollows (8,9;108,109;208,209) from the respective heads (4,5;104,105;204,205) of the blow molding machine (37;137;237), and blowing air in the parison (14,16;114,116;215,217), in a manner such that a plurality of independent pipes (1,2;101,102;201,202) are molded in the respective hollows (8,9;108,109;208,209) and that the pipes (1,2;101,102;201,202) are joined with each other at the lateral walls thereof by the parison (14,16;114,116;215,217) which are forced in the channels (34;129;134;234) upon air blowing. Suction forces are preferablly applied on the parison (14,16;114,116;215,217) when the parison is fed into the hollows (8,9;108,109;208,209) of the molding die (39 139 239). The pipe unit (3;103;203) thus fabricated is light in weight and possesses flexibility as well as anticorrosion property due to the characteristics of the parison (14,16;114,116;215,217).