Device and method for the production of plastic parts with drying and desiccant feed devices

Patent metadata

Field	Value
Publication number	US-12304113-B2
Application number	US-202318459566-A
Country	US
Kind code	B2
Filing date	Sep 1, 2023
Priority date	Dec 19, 2017
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A device ( 1 ) and method for the production of plastic parts ( 2 ), having a first plastic feed device ( 3 a ) for feeding a first liquid plastic starting component (K 1 ); a second plastic feed device ( 3 b ) for feeding a second liquid plastic starting component (K 2 ); a mixing device ( 5 ) with a mixing chamber ( 6 ), wherein in the mixing chamber the liquid plastic starting components that can be fed by the plastic feed devices can be mixed to form a plastic mixture (KG); a discharge nozzle ( 7 ) for discharging the plastic mixture; and a cooling device ( 8 ) for the mixing device, wherein a drying device ( 9 ) surrounding the mixing device at least in regions is provided, wherein the drying device has a separating device ( 10 ), a drying chamber (T) formed between the separating device and the mixing device, and a desiccant feeding device ( 11 ) opening into the drying chamber are disclosed.

First claim

The invention claimed is:

1. A method for producing plastic parts, the method comprising:
feeding a first liquid plastics starting component and a second liquid plastics starting component to a mixing chamber of a mixing device;
mixing the first liquid plastics starting component and the second liquid plastics starting component in the mixing chamber to form a plastics mixture;
cooling the mixing device using a coolant that is passed through at least one cooling duct that is formed in a housing of the mixing device;
discharging the plastics mixture through a discharge nozzle; and
drying the mixing device using a drying device that at least partially surrounds the mixing device by introducing compressed air into a drying chamber defined between the mixing device and a separation device via a pipe at least partially extending into the drying chamber,
wherein a dew point temperature of the compressed air is below 5° C.

2. The method of claim 1 , wherein introducing the compressed air into the drying chamber comprises introducing between 100 and 500 standard liters of the compressed air into the drying chamber per hour.

3. The method of claim 1 , wherein the pipe is directed toward the discharge nozzle.

4. The method of claim 1 , wherein the first liquid plastics starting component is selected from the group consisting of polyol, isocyanate, silicone, epoxy resin, modified silane polymer, adhesive component, booster paste, and combinations thereof.

5. The method of claim 1 , wherein the second liquid plastics starting component is selected from the group consisting of polyol, isocyanate, silicone, epoxy resin, modified silane polymer, adhesive component, booster paste, and combinations thereof.

6. The method of claim 1 , wherein the at least one cooling duct spirals around the mixing device.

7. The method of claim 1 , wherein the at least one cooling duct receives the coolant from a coolant source.

8. The method of claim 1 , wherein the coolant is at least one of water, an oil, a glycol-water mixture, or an alcohol.

9. The method of claim 1 , further comprising feeding a gas into the mixing chamber of the mixing device while mixing the first liquid plastics starting component and the second liquid plastics starting component.

10. The method of claim 9 , wherein mixing the first liquid plastics starting component and the second liquid plastics starting component in the mixing chamber to form the plastics mixture comprises mixing the first liquid plastics starting component, the second liquid plastics starting component, and the gas in the mixing chamber to form a foamed plastics mixture.

11. The method of claim 1 , wherein the first liquid plastics starting component and the second liquid plastics starting component are mixed in the mixing chamber using a dynamic mixing, static mixing, or high pressure mixing.

12. The method of claim 1 , wherein the first liquid plastics starting component and the second liquid plastics starting component are dynamically mixed in the mixing chamber using a stirrer.

13. The method of claim 1 , wherein cooling the mixing device is performed while mixing the first liquid plastics starting component and the second liquid plastics starting component in the mixing chamber.

14. The method of claim 1 , wherein:
feeding the first liquid plastics starting component comprises controlling the feeding of the first liquid plastics starting component using a first valve; and
feeding the second liquid plastics starting component comprises controlling the feeding of the second liquid plastics starting component using a second valve.

15. The method of claim 1 , wherein the separation device is pocket-shaped, trough-shaped, cap-shaped, shell-shaped, or dome-shaped.

16. The method of claim 1 , wherein the coolant is a cooling liquid.

17. A method for producing plastic parts, the method comprising:
feeding a first liquid plastics starting component and a second liquid plastics starting component to a mixing chamber of a mixing device;
feeding a gas into the mixing chamber of the mixing device while mixing the first liquid plastics starting component and the second liquid plastics starting component;
mixing the first liquid plastics starting component, the second liquid plastics starting component, and the gas in the mixing chamber to form a foamed plastics mixture;
cooling the mixing device using a cooling device;
discharging the foamed plastics mixture through a discharge nozzle; and
drying the mixing device using a drying device that at least partially surrounds the mixing device by introducing compressed air into a drying chamber defined between the mixing device and a separation device via a pipe at least partially extending into the drying chamber.

18. The method of claim 17 , wherein the pipe is directed toward the discharge nozzle.

19. A method for producing plastic parts, the method comprising:
feeding a first liquid plastics starting component and a second liquid plastics starting component to a mixing chamber of a mixing device;
mixing the first liquid plastics starting component and the second liquid plastics starting component in the mixing chamber to form a plastics mixture;
spiraling a coolant around the mixing device to cool the mixing device;
discharging the plastics mixture through a discharge nozzle; and
drying the mixing device using a drying device that at least partially surrounds the mixing device by introducing compressed air into a drying chamber defined between the mixing device and a separation device via a pipe at least partially extending into the drying chamber;
wherein a dew point temperature of the compressed air is below 5° C.

20. The method of claim 19 , wherein the pipe is directed toward the discharge nozzle.

Assignees

• Henkel Ag & Co Kgaa

Inventors

• Metzler Mario

Classifications

• B01F33/8364

  with drying · CPC title

• B01F2035/98

  Cooling · CPC title

• B29K2075/00

  Use of {PU, i.e.} polyureas or polyurethanes {or derivatives thereof}, as moulding material · CPC title

• B29B7/7457

  Mixing heads without moving stirrer (B29B7/7438, B29B7/76 take precedence) · CPC title

• B29B7/7409

  with supply of gas · CPC title