Particulate curing system

• US 6,528,800 B1
• Filed: 03/03/2000
• Issued: 03/04/2003
• Est. Priority Date: 03/03/1999
• Status: Expired due to Fees

• Current Assignee: Steris Corporation
• Original Assignee: Steris Corporation
• Inventors: Rhodes, Chad, Swanson, Daniel G., Dzwierzynski, Jerome A.
• Primary Examiner(s): BERMAN, JACK I
• Application Number:
  US09/517,772
• Time in Patent Office: 1,096 Days
• Field of Search: 250/435, 250/432.R, 250/433, 250/428, 406/79, 406/82, 406/180
• US Class Current: 250/432.00R
• CPC Class Codes: G21K 5/02 having no beam-forming means

Abstract

A conveying system (22) transports loose particulate material past a radiation source (200). A feed system (20) discharges particulate material onto the conveying system (22). A pneumatic system with an inlet manifold (14) and tubes (16) provides air through which the particulate material is fluidly transported to the feed system (20). A receiving hopper (24) receives the particulate matter from the conveying system (22). A dump hopper (10) dumps the particulate material into the pneumatic system. A discharge manifold (18) separates the particulate material from air. A metering gate (70) is located at a base of a hopper (69), which controls the layer of particulate material deposited onto said conveyor. A second inlet manifold (26) and tubes (28) adjacent the receiving hopper entrains the particulate material in air. A receiving station (32) receives the particulate material from a second discharge manifold (30).

Claims

1. A particulate irradiating system comprising:

a radiation source;

a conveying system adjacent said radiation source for transporting loose particulate material past the radiation source; and

a pneumatic delivery system adjacent said conveying system for fluidly conveying said particulate material to said conveying system, the delivery system including a first inlet manifold having a plurality of pneumatic tubes in a spaced relation through which the particulate material is conveyed; and

,

a first discharge manifold connected with the plurality of pneumatic tubes for separating said particulate material from fluid and delivering the particulate material to the conveying system.

2. The particulate irradiating system of claim 1, further comprising a dump hopper which dumps said particulate material into said delivery system.

3. The particulate irradiating system of claim 1, wherein the discharge manifold includes:

a feed hopper positioned above said conveying system for discharging said particulate material onto said conveying system.

4. The particulate irradiating system of claim 3, wherein said feed hopper further comprises a metering gate at a base of said feed hopper, said metering gate controls a layer of particulate material deposited onto said conveying system.

5. The particulate irradiating system of claim 3, wherein the discharge manifold includes:

a first and second cyclone hopper positioned adjacent each other and above said feed hopper.

6. The particulate irradiating system of claim 5, wherein said cyclone hoppers further comprise sensors located adjacent a top portion and bottom portion of said hoppers, said sensors being used to monitor a level of particulate material within said hoppers.

7. The particulate irradiating system of claim 6, wherein said pneumatic delivery system further comprises:

a metering valve to open and close the hopper in response to the sensors.

8. The particulate irradiating system of claim 1, further comprising a receiving hopper for receiving said particulate material from said conveying system, said receiving hopper being located below said conveying system.

9. The particulate irradiating system of claim 8, wherein said receiving hopper comprises a hopper and a metering device positioned below said hopper.

10. The particulate irradiating system of claim 9, wherein said metering device comprises:

a plurality of veins to control the amount of particulate material flowing through the hopper and reduce noise from air flow.

11. The particulate irradiating system of claim 1 wherein said radiation source provides an electron beam to irradiate said particulate material.

12. The particulate irradiating system of claim 1, wherein said particulate material comprises polymer pellets.

13. A particulate irradiating system comprising:

a radiation source which generates a beam of radiation;

a conveyor for transporting loose particulate material through the beam of radiation;

a pneumatic delivery system for fluidly transporting said particulate material entrained in fluid;

a separator connected with the pneumatic delivery system to separate the particulate material from the fluid and deposit the particulate material on the conveyor upstream of the radiation beam;

a receiver which receives the particulate material from said conveyor downstream from the radiation beam; and

,

an inlet manifold adjacent said receiver and at least one pneumatic tube extending from said inlet manifold for entraining said particulate material in fluid.

14. The particulate irradiating system of claim 13, further comprising a discharge manifold extending from said at least one pneumatic tube for separating said particulate material from the fluid.

15. The particulate irradiating system of claim 14 further comprising a receiving station which receives said particulate material from said discharge manifold.

16. The particulate irradiating system of claim 15, wherein said receiving station further comprises a pair of cyclone hoppers which deposit said particulate material into packaging.

17. A particulate irradiating system comprising:

a particle accelerator for generating a beam of accelerated electrons;

a belt conveyor for transporting loose particulate material through the accelerated electron beam;

a pneumatic conveying system for providing air through which the particulate material is fluidly conveyed;

a feed device which receives the particulate material and air from the pneumatic conveying system and deposits a layer of the particulate material on a conveyor belt of the belt conveyor, the feed device including;

a level control which controls a thickness of the particulate material layer on the conveyor belt; and

a receiving device for receiving said particulate material from said conveyor belt, said receiving system being located below said conveyor belt.

18. The particulate irradiating system of claim 17, wherein said pneumatic system further comprises a first discharge manifold extending from said at least one tube for separating said particulate material from air.

19. The particulate irradiating system of claim 18, further comprising a second inlet manifold adjacent said receiving device and at least one tube for entraining said particulate material received in the receiving device in an air flow.

20. The particulate irradiating system of claim 19, further comprising a second discharge manifold extending from said at least one tube for separating said particulate material from air.

21. The particulate irradiating system of claim 20 further comprising a receiving station which receives said particulate material from said second discharge manifold.

22. A method of irradiating particulates comprising:

accelerating electrons;

forming the accelerated electrons into an electron beam;

entraining a particulate material in air and pneumatically conveying the particulate material adjacent the electron beam;

depositing the particulate material on a moving belt;

conveying the particulate material through the electron beam on the moving belt; and

pneumatically re-entraining said particulate material in air from the moving belt.

23. The method as set forth in claim 22 further including:

controlling a thickness in a direction of the electron beam of a layer of the particulate material on the moving belt.

24. The method as set forth in claim 22 further including:

pneumatically conveying the material to a location remote from the electron beam; and

at the remote location depositing the particulate material in packaging.

25. A particulate irradiating system comprising:

a means for generating a beam of radiation;

a conveyor belt which passes through the beam of radiation;

a means for conveying particulates entrained in air onto said conveyor belt;

a means for de-entraining the particulates from the air and depositing a layer of the particulates on the conveyor belt upstream of the radiation beam;

a means for controlling a thickness of the deposited particulate layer; and

,

a means for receiving said particulates from said conveyor belt downstream of the radiation beam and, entraining the particulates in a fluid flow.

26. A method of irradiating particulates comprising:

pneumatically conveying particulate material entrained in fluid through pneumatic tubes;

de-entraining and depositing the particulate material onto a conveyor belt;

conveying the deposited particulate material on the conveyor belt through an electron beam; and

,

re-entraining and pneumatically conveying the particulate material from the conveyor belt through pneumatic tubes.