US3687585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for manufacturing synthetic resin tube provided with heat-shrinking property
Assignee: Individual
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Filing: 1970-01-02
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Granted: 1972-08-29
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Expires: 1990-01-02
Abstract
Abstract Apparatus for manufacturing a thermoplastic synthetic resin tube whose diameter shrinks to its original diameter when re-heated using the method comprising the steps of inflating a softened material tube with air in a heater cylinder of larger diameter to enlarge the original tube diameter, then cooling it rapidly and finally winding same flat onto a reel through take-up rolls. The thus finished tube has an increased outlet for covering or sealing application on dry cells, bamboo rods, bottle-caps, etc. because of its shrinking to the original diameter by re-heating.
Inventors
- 👤 Haruo Takagi
- 👤 Yasuo Yamagishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:45
CPC Classifications
B; B29; B29C; B29C61/00; B29C61/06; B29C61/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
209 words
Apparatus for continuously producing a heat-shrinkable plastic tubing, comprising in combination: A. means for continuously supplying thermoplastic tubing to be dimensionally reorienteD to have heat-shrinkable characteristics; B. frame means including relatively spaced upstream and downstream pairs of nipper rolls journaled thereon for receiving a run of the tubing to be treated therebetween, said nipper roll pairs including means for trapping an air bubble therebetween and means for maintaining the air bubble at a substantially stable pressure for maintaining uniformity of production without reinflating the run of tubing between the nipper rolls; C. power means operatively connected to said rolls for continuously drawing the tubing through the pairs of rolls while the run therebetween is substantially uniformly inflated; D. heating and cooling means for said tubing on said frame and disposed in series between said downstream and upstream roll pairs for heating the tubing to cause it to radially expand and cooling the tubing while expanded whereby the tubing has heatshrinkable characteristics when subsequently reheated, said means for maintaining the substantially stable pressure in said run of tube between the nipper rolls comprising an adjustable mounting including means for longitudinally spacing the rolls in relation to the run of tubing therebetween and the pressure of the air bubble trapped therein.
Claim 2
Dependent Claim
209 words
Apparatus for continuously producing a heat-shrinkable plastic tubing, comprising in combination: A. means for continuously supplying thermoplastic tubing to be dimensionally reorienteD to have heat-shrinkable characteristics; B. frame means including relatively spaced upstream and downstream pairs of nipper rolls journaled thereon for receiving a run of the tubing to be treated therebetween, said nipper roll pairs including means for trapping an air bubble therebetween and means for maintaining the air bubble at a substantially stable pressure for maintaining uniformity of production without reinflating the run of tubing between the nipper rolls; C. power means operatively connected to said rolls for continuously drawing the tubing through the pairs of rolls while the run therebetween is substantially uniformly inflated; D. heating and cooling means for said tubing on said frame and disposed in series between said downstream and upstream roll pairs for heating the tubing to cause it to radially expand and cooling the tubing while expanded whereby the tubing has heatshrinkable characteristics when subsequently reheated, said means for maintaining the substantially stable pressure in said run of tube between the nipper rolls comprising an adjustable mounting including means for longitudinally spacing the rolls in relation to the run of tubing therebetween and the pressure of the air bubble trapped therein.
Claim 3
Dependent Claim
31 words
The combination as claimed in claim 1 in which said adjustable mounting comprises a platform reciprocably supported on said frame and upon which said pair of upstream nipper rolls are journaled.
Claim 4
Dependent Claim
53 words
The combination as set forth in claim 2 in which said power means is mounted on said platform and is operatively connected to one of the rolls of said upstream pair, and counterbalance means on said frame and operatively connected to said platform for facilitating relative longitudinal spacing between said nipper roll pairs.
Claim 5
Dependent Claim
213 words
Apparatus for continuously producing a heat-shrinkable plastic tubing, comprising in combination: A. means for continuously supplying thermoplastic tubing to be dimensionally reoriented to have heat-shrinkable characteristics; B. frame means including relatively spaced upstream and downstream pairs of nipper rolls journaled thereon for receiving a run of the tubing to be treated therebetween, said nipper roll pairs including means for trapping an air bubble therebetween and means for maintaining the air bubble at a substantially stable pressure for maintaining uniformity of production without reinflating the run of tubing between the nipper rolls; C. power means operatively connected to said rolls for continuously drawing the tubing through the pairs of rolls while the run therebetween is substantially uniformly inflated; D. heating and cooling means for said tubing on said frame and disposed in series between said downstream and upstream roll pairs for heating the tubing to cause it to radially expand and cooling the tubing while expanded whereby the tubing has heat-shrinkable characteristics when subsequently reheated, said heating and cooling means comprising axially aligned tubular chambers respectively including means for circulating a heating and cooling medium therein, said tubular chambers including axial passages through which the tubing being treated is passed and said passages defining the cross section to which the treated tubing is expanded.
Claim 6
Dependent Claim
213 words
Apparatus for continuously producing a heat-shrinkable plastic tubing, comprising in combination: A. means for continuously supplying thermoplastic tubing to be dimensionally reoriented to have heat-shrinkable characteristics; B. frame means including relatively spaced upstream and downstream pairs of nipper rolls journaled thereon for receiving a run of the tubing to be treated therebetween, said nipper roll pairs including means for trapping an air bubble therebetween and means for maintaining the air bubble at a substantially stable pressure for maintaining uniformity of production without reinflating the run of tubing between the nipper rolls; C. power means operatively connected to said rolls for continuously drawing the tubing through the pairs of rolls while the run therebetween is substantially uniformly inflated; D. heating and cooling means for said tubing on said frame and disposed in series between said downstream and upstream roll pairs for heating the tubing to cause it to radially expand and cooling the tubing while expanded whereby the tubing has heat-shrinkable characteristics when subsequently reheated, said heating and cooling means comprising axially aligned tubular chambers respectively including means for circulating a heating and cooling medium therein, said tubular chambers including axial passages through which the tubing being treated is passed and said passages defining the cross section to which the treated tubing is expanded.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |