Vacuum drying and solvent recovery device

Abstract

Disclosed is a vacuum drying and solvent recovery device, including a vacuum drying system for drying an ink jet printing (IJP) ink by volatilizing a solvent in the IJP ink and a solvent recovery system for recovering the solvent volatilized from the IJP ink. By integrating the solvent recovery system outside the vacuum drying system and providing a plurality of solvent recovery chambers in the solvent recovery system to condense and recover solvents for various systems, the recycling of the solvents in the IJP inks and the reduction of production costs can be achieved.

Claims

1. A vacuum drying and solvent recovery device, comprising a vacuum drying system for drying an ink jet printing (IJP) ink by volatilizing a solvent in the IJP ink and a solvent recovery system for recovering the solvent volatilized from the IJP ink; wherein the vacuum drying system comprises a vacuum chamber and a vacuum exhaust pump set connected to the vacuum chamber; the solvent recovery system comprises a plurality of solvent recovery chambers, an exhaust gas treatment unit coupled to the plurality of solvent recovery chambers and a valve switching unit for selectively conducting the vacuum exhaust pump set, one of the plurality of solvent recovery chambers and the exhaust gas treatment unit; in use, the vacuum exhaust pump set provides a negative pressure environment to the vacuum chamber, so that the solvent in the IJP ink is volatilized under the negative pressure environment of the vacuum chamber and is extracted from the vacuum chamber by the vacuum exhaust pump set to dry the IJP ink; the valve switching unit connects the solvent recovery chamber with the vacuum exhaust pump set, so that gas discharged from the vacuum exhaust pump set is conducted into the solvent recovery chamber and cooled by the solvent recovery chamber to condense and recover the solvent, and to discharge remaining gas to the exhaust gas treatment unit for exhaust gas treatment; or the valve switching unit directly connects the exhaust gas treatment unit with the vacuum exhaust pump set, so that the gas discharged from the vacuum exhaust pump set is conducted to the exhaust gas treatment unit for exhaust gas treatment; wherein each solvent recovery chamber comprises a cooling box, a condensation tube disposed in the cooling box and connected to the valve switching unit at a front end for condensing the solvent in the gas, a recovery container disposed in the cooling box and connected to the condensation tube at a rear end for receiving the solvent condensed in the condensation tube, an exhaust pipe connected to a recovery container for the discharging uncondensed residual gas in the condensation tube to the exhaust gas treatment unit and a cooling unit for cooling the condensation tube in the cooling box.

2. The vacuum drying and solvent recovery device according to claim 1, wherein in use, a temperature in the solvent recovery chamber is set to −20 degrees Celsius to 10 degrees Celsius.

3. The vacuum drying and solvent recovery device according to claim 1, wherein the condensation tube is made of glass.

4. The vacuum drying and solvent recovery device according to claim 1, wherein a total length of the condensation tube is greater than 20 m.

5. The vacuum drying and solvent recovery device according to claim 1, wherein the condensation tube is spiral.

6. The vacuum drying and solvent recovery device according to claim 1, wherein an outer wall of the cooling box is made of a heat insulating material.

7. The vacuum drying and solvent recovery device according to claim 1, wherein the cooling unit is a water bath cooler or a compressed air cooler.

8. The vacuum drying and solvent recovery device according to claim 1, wherein the vacuum exhaust pump set comprises a molecular pump disposed under the vacuum chamber, a first pre-stage pump in communication with an upper end of the vacuum chamber and a second pre-stage pump in communication with an outlet end of the molecular pump.

9. The vacuum drying and solvent recovery device according to claim 1, wherein the IJP ink is an IJP ink used to form a functional layer of an organic light emitting diode (OLED) device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The technical solution and the beneficial effects of the present invention are best understood from the following detailed description with reference to the accompanying figures and embodiments.

(2) In drawings,

(3) FIG. 1 is a structural diagram of a vacuum drying and solvent recovery device of the present invention;

(4) FIG. 2 is a structural diagram of a solvent recovery chamber in the vacuum drying and solvent recovery device of the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

(5) For better explaining the technical solution and the effect of the present invention, the present invention will be further described in detail with the accompanying drawings and the specific embodiments.

(6) As shown in FIG. 1, the present invention provides a vacuum drying and solvent recovery device, comprising a vacuum drying system 1 for drying an ink jet printing (IJP) ink by volatilizing a solvent in the IJP ink and a solvent recovery system 2 for recovering the solvent volatilized from the IJP ink;

(7) wherein the vacuum drying system comprises a vacuum chamber 11 and a vacuum exhaust pump set 12 connected to the vacuum chamber 11;

(8) the solvent recovery system 2 comprises a plurality of solvent recovery chambers 21, an exhaust gas treatment unit 22 coupled to the plurality of solvent recovery chambers 21 and a valve switching unit 23 for selectively conducting the vacuum exhaust pump set 12, one of the plurality of solvent recovery chambers 21 and the exhaust gas treatment unit 22;

(9) in use, the vacuum exhaust pump set 12 provides a negative pressure environment to the vacuum chamber 11, so that the solvent in the IJP ink is volatilized under the negative pressure environment of the vacuum chamber 11 and is extracted from the vacuum chamber 11 by the vacuum exhaust pump set 12 to dry the IJP ink; according to the specific situation of gas extracted from the vacuum chamber 11 by the vacuum exhaust pump set 12, the valve switching unit 23 connects the solvent recovery chamber 21 with the vacuum exhaust pump set 12, so that the gas discharged from the vacuum exhaust pump set 12 is conducted into the solvent recovery chamber 21 and cooled by the solvent recovery chamber 21 to condense and recovery the solvent, and to discharge remaining gas to the exhaust gas treatment unit 22 for exhaust gas treatment; or the valve switching unit 23 directly connects the exhaust gas treatment unit 22 with the vacuum exhaust pump set 12, so that the gas discharged from the vacuum exhaust pump set 12 is conducted to the exhaust gas treatment unit 22 for exhaust gas treatment.

(10) Specifically, each solvent recovery chamber 21 comprises a cooling box 211, a condensation tube 212 disposed in the cooling box 211 and connected to the valve switching unit 23 at a front end for condensing the solvent in the gas, a recovery container 213 disposed in the cooling box 211 and connected to the condensation tube 212 at a rear end for receiving the solvent condensed in the condensation tube 212, an exhaust pipe 214 connected to a recovery container 213 for the discharging uncondensed residual gas in the condensation tube 212 to the exhaust gas treatment unit 22 and a cooling unit 215 for cooling the condensation tube 212 in the cooling box 211.

(11) Specifically, in use, a temperature in the solvent recovery chamber 21 is set to −20 degrees Celsius to 10 degrees Celsius.

(12) Specifically, in order to observe the condensation of the solvent in the condensation tube 212 in real time, the condensation tube 212 is preferably made of a transparent glass material.

(13) Specifically, in order to ensure that the solvent volatilized from the IJP ink can be sufficiently condensed in the condenser tube 212, a total length of the condenser tube 212 is greater than 20 m.

(14) Specifically, the condensation tube 212 is spirally bent to the cooling box 211.

(15) Specifically, an outer wall of the cooling box 211 is made of a heat insulating material.

(16) Specifically, the cooling unit 215 is a water bath cooler or a compressed air cooler.

(17) Specifically, the vacuum exhaust pump set 12 comprises a molecular pump 121 disposed under the vacuum chamber 11, a first pre-stage pump 122 in communication with an upper end of the vacuum chamber 11 and a second pre-stage pump 123 in communication with an outlet end of the molecular pump 121.

(18) Specifically, the IJP ink is an IJP ink used to form a functional layer of an organic light emitting diode (OLED) device.

(19) The vacuum drying and solvent recovery device of the present invention integrates a solvent recovery system 2 outside the vacuum drying system 1, and provides a plurality of solvent recovery chambers 21 in the solvent recovery system 2 to condense and recover solvents for various systems to achieve the recycling of the solvents in the IJP inks and the reduction of production costs.

(20) In conclusion, the vacuum drying and solvent recovery device provided by the present invention includes a vacuum drying system for drying an ink jet printing (IJP) ink by volatilizing a solvent in the IJP ink and a solvent recovery system for recovering the solvent volatilized from the IJP ink. By integrating the solvent recovery system outside the vacuum drying system and providing a plurality of solvent recovery chambers in the solvent recovery system to condense and recover solvents for various systems, the recycling of the solvents in the IJP inks and the reduction of production costs can be achieved.

(21) Above are only specific embodiments of the present invention, the scope of the present invention is not limited to this, and to any persons who are skilled in the art, change or replacement which is easily derived should be covered by the protected scope of the invention. Thus, the protected scope of the invention should go by the subject claims.