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

Patent metadata

Field	Value
Publication number	US-11724838-B2
Application number	US-202016984285-A
Country	US
Kind code	B2
Filing date	Aug 4, 2020
Priority date	Mar 31, 2017
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

Provided are a method and an apparatus for extruding into a tube and filling the tube at a high speed and simultaneously sealing the tube. Specifically provided is a method for producing a polymer tube, containing a liquid therein and being sealed at constant intervals, the method including an extrusion step of continuously melt-extruding a polymer material through a die into at least one tube, while feeding a liquid into the tube to obtain at least one liquid-containing tube; and sealing step of discontinuously pressing the at least one liquid-containing tube between a pair of pressurizing members at constant intervals to cause pressure-bonding before the tube solidifies, while continuously taking up the extruded tube.

First claim

The invention claimed is:

1. 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.

2. The apparatus according to claim 1 , wherein the die comprises two discharge pores and a slit connecting the two discharge ports, and one of the rotary horns has a blade which protrudes radially higher than the protrusion on the circumference.

3. The apparatus according to claim 1 , comprising a guide configured to support the at least one liquid-containing tube and placed around the protrusion of one of the rotary horns.

4. The apparatus according to claim 1 , further comprising a cooling bath configured to cool the discontinuously pressed tube.

5. The apparatus according to claim 2 , further comprising a cooling bath configured to cool the discontinuously pressed tube.

6. The apparatus according to claim 3 , further comprising a cooling bath configured to cool the discontinuously pressed tube.

Assignees

• Shinetsu Chemical Co

Inventors

• Saguchi Ryuichi
• Kaji Tomoaki
• Naruse Masahiko

Classifications

• B65B3/022 Primary

  Making containers by moulding of a thermoplastic material · CPC title

• B29C48/00

  Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor (extrusion blow-moulding B29C49/04) · CPC title

• B29C48/0019

  combined with shaping by flattening, folding or bending · CPC title

• B29C48/0021

  combined with joining, lining or laminating · CPC title

• B29C48/09

  Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels · CPC title