US4054692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of impregnating and drying materials and installations for carrying out this method
Assignee: Mecalix SA
•
Filing: 1975-12-18
•
Granted: 1977-10-18
•
Expires: 1995-12-18
Abstract
Abstract This specification discloses a method of impregnating and drying material such as cardboard or corrugated cardboard preliminary shaped or not, comprising a certain number of steps and more particularly a step of impregnating cardboard located inside a sealed container by means of an impregnating liquid which is formed by impregnating substance and solvent, a step of drying the cardboard still located inside said container and a step of recovering the solvent during the step of drying in view to recycle it.
Inventors
- 👤 Jean Monmarson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:24
CPC Classifications
D; D21; D21H; D21H23/00; D21H23/02; D21H23/22; D21H23/32; D21H23/42; D21H5/00; D21H5/0005; D21H5/0012; D21H5/002
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
A method of impregnating and drying cardboard for packaging purpose with impregnating liquid which is formed by an impregnating substance and solvent, said method comprising the steps of isolating the material in a sealed treatment container; introducing and maintaining during the treatment period, said impregnating liquid into said treatment container; evacuating said impregnating liquid, after said treatment; creating a vacuum in said treatment container to extract all traces of solvent by pumping; recycling said solvent after pumping; said method further comprising the step of removing substantially all traces of oxygen from said treatment container before the step of introducing impregnating liquid; and the step of controlling the rate of evaporation and of recovery of the solvent to provent bubbles from forming locally in the cardboard.
Claim 2
Independent Claim
125 words
A method of impregnating and drying cardboard for packaging purpose with impregnating liquid which is formed by an impregnating substance and solvent, said method comprising the steps of isolating the material in a sealed treatment container; introducing and maintaining during the treatment period, said impregnating liquid into said treatment container; evacuating said impregnating liquid, after said treatment; creating a vacuum in said treatment container to extract all traces of solvent by pumping; recycling said solvent after pumping; said method further comprising the step of removing substantially all traces of oxygen from said treatment container before the step of introducing impregnating liquid; and the step of controlling the rate of evaporation and of recovery of the solvent to provent bubbles from forming locally in the cardboard.
Claim 3
Dependent Claim
39 words
A method of impregnating material according to claim 1, wherein before the step of introducing said impregnating liquid into said treatment container, said liquid is heated by conductive thermal contact with pipes through which a heat-bearing heating fluid flows.
Claim 4
Dependent Claim
23 words
A method of impregnating and drying material according to claim 2, wherein said heated liquid is sumitted to a pressure inside said tank.
Claim 5
Dependent Claim
37 words
A method of impregnating material according to claim 1, wherein said sealed treatment container is heated by conductive thermal contact with pipes through which a heat-bearing flows during the step of isolating the material in said container.
Claim 6
Dependent Claim
27 words
A method of impregnating and drying material according to claim 1, wherein said material is preheated before the step of isolating said material in said treatment container.
Claim 7
Dependent Claim
37 words
A method of impregnating and drying material according to claim 1 further comprising during step of introducing and maintening during said treatment period, a step of regulating vapour pressure into said container as a function of temperature.
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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |