Method for producing polymer tube containing liquid and being sealed at constant intervals and apparatus for producing polymer tube

An apparatus for producing a polymer tube, containing a liquid therein and being sealed at constant intervals, the apparatus comprising:

• a die configured for melt extrusion of a polymer material into at least one tube;
• a mandrel configured to feed a liquid into the at least one tube during the melt extrusion to obtain at least one liquid-containing tube;
• one or more rollers configured to take up the at least one liquid-containing tube;
• and
• a pair of pressurizing members configured to discontinuously press the at least one liquid-containing tube between the pair of pressurizing members to cause pressure-bonding before the tube solidifies, wherein the pair of pressurizing m embers is a pair of rotary horns, each horn having a protrusion, and the pair of rotary horns is configured to discontinuously press the at least one liquid-containing tube between the protrusions to cause pressure-bonding.