Apparatus for spreading material serving for the manufacture of fiberboards

• US 3,897,185 A
• Filed: 11/07/1973
• Issued: 07/29/1975
• Est. Priority Date: 11/07/1972
• Status: Expired due to Term

• Current Assignee: Reinhardt Beyer
• Original Assignee: Reinhardt Beyer
• Inventors: Beyer, Reinhardt
• Primary Examiner(s): Spicer, Jr., Robert L.
• Application Number:
  US05/413,424
• Time in Patent Office: 629 Days
• Field of Search: 425/80,81,82,83
• US Class Current: 425/81.1
• CPC Class Codes: B27N 3/14 Distributing or orienting the particles or fibres

Abstract

Apparatus for spreading or scattering fiber or chip fleeces made up of a mixture of cuttings of extremely fine or superfine, fine, and coarser glue-covered chips for the subsequent press forming into fiberboards and the like. A mixture of chips is supplied to a fleece or particle carrier by gravity feed between sets of air emitting classifying registers. The upper portion of the classifying registers include oppositely facing air outlet openings which face the stream of chips and effect an initial classification by spreading some of the fine and superfine particles outwardly of the central stream. The lower part of the registers include openings facing oppositely to one another and away from the center line of the stream of particles and spaced from one another to permit passage therebetween of a central portion of the mixture without further modification. Baffle plates are also provided in preferred embodiments to assist in preventing further classification of the central stream in the lower regions of the registers. The baffle plates are vertically adjustable so as to accommodate varying conditions for desired varying thickness boards to be formed by the layers of particles passed through the distributing chamber containing the air classifying registers.

Claims

1. Apparatus for spreading a mixture of superfine, fine and coarser particles onto a particle carrier for subsequent pressforming into fiberboards and the like;

said apparatus comprising;

particle supply means spaced vertically from said particle carrier and including means for supplying a heterogeneous mixture of superfine, fine and coarser particles to said particle carrier such that said mixture falls downwardly towards said particle carrier with a particle path centerline extending downwardly from said particle supply means to said particle carrier;

upper particle classifying means disposed between said particle supply means and said particle carrier and including a plurality of upper conduit means at each of opposite lateral sides of the path centerline, the upper conduit means at one side of the path centerline having upper outlet openings which face correspOnding upper outlet openings of the upper conduit means at the other side of the path centerline, said upper outlet openings being spaced from one another in a direction transverse to said path centerline to permit passage therebetween of portions of said mixture while gas under pressure is discharged from said upper outlet openings to effect a classification of the particles with the superfine and fine particles spaced further from the path centerline than the coarser particles;

lower particle classifying means disposed between said upper particle classifying means and said particle carrier and including a plurality of lower conduit means at each of said opposite lateral sides of the path centerline, the lower conduit means at one side of the path centerline having lower outlet openings facing in one direction away from the path centerline and the lower conduit means at the other side of the path centerline having lower outlet openings facing in an opposite direction away from the path centerline, said lower outlet openings at the one side of said centerline path being spaced from the lower outlet openings at the other side of the centerline path to form a space therebetween for the passage therethrough of a portion of the particle mixture without further classification by said lower particle classifying means while other portions of the particle mixture pass outwardly of said lower outlet openings and are further classified by gas under pressure exiting from said lower outlet openings, whereby boards can be constructed with that portion of the particle mixture which is classified only by the upper classifying means forming central board sections and that portion of the particle mixture which is classified by both the upper and lower classifying means forming edge board sections.

2. Apparatus according to claim 1, wherein said gas under pressure is air, and wherein separate means are provided for controlling the velocity of the air exiting from the respective upper and lower outlet openings.

3. Apparatus according to claim 1, wherein said upper conduit means are arranged in vertical rows immediately adjacent one another, said vertical rows being spaced from one another in a direction extending transverse to said particle carrier for permitting flow of gas across from said upper outlet openings.

4. Apparatus according to claim 3, wherein said lower conduit means are arranged in vertical rows immediately adjacent one another which are aligned with respective vertical rows of said upper conduit means.

5. Apparatus according to claim 3, wherein said gas under pressure is air, and wherein separate means are provided for controlling the velocity of the air exiting from the respective upper and lower outlet openings.

6. Apparatus according to claim 1, wherein baffle means are disposed at respective opposite sides of the space formed between the lower outlet openings for adjusting the flow of gas in said space and for guiding that portion of said particle mixture passing through said space.

7. Apparatus according to claim 6, wherein said baffle means include vertically adjustable baffle plates at each of the respective opposite sides of said space.

8. Apparatus according to claim 6, further comprising a distributing chamber for housing said classifying means, wherein said upper and lower outlet openings are substantially uniformly distributed across the width of said distributing chamber with said outlet openings arranged in a mirror image-relationship at opposite sides of a centerplane through which said path centerline extends.

9. Apparatus according to claim 8, wherein said baffle means includes a pair of transverse plates extending across the width of said distributing chambers at respective opposite sides of said centerplane, baffle plates arranged respectively in substantially the same planes as said transverse plates, and means for accommodating displacement of said baffle plates with respect to the associated transverse plates.

10. ApparAtus according to claim 9, wherein said transverse plates and baffle plates extend in oblique planes with respect to said centerplane.

11. Apparatus according to claim 10, wherein said transverse plates extend below said baffle plates.

12. Apparatus according to claim 11, wherein said baffle plates extend between respective vertical rows of said lower conduit means.

13. Apparatus according to claim 12, further comprising a pair of driven and reciprocated spiked rolls positioned below a chute formed by said transverse plates for assisting in uniformly spreading that portion of the particle mixture passing between said lower outlet openings.

14. Apparatus according to claim 1, wherein said mixture consists of superfine, fine and coarser glue-covered chips for the subsequent formation of fiberboards.

15. Apparatus according to claim 1, wheren said conduit means includes register groups having ducts connecting the source of pressurized gas to each of respective ones of said outlet openings.

16. Apparatus according to claim 5, wherein said conduit means includes register groups having ducts connecting a source of pressurized air to each of respective ones of said outlet openings.

17. Apparatus according to claim 15, wherein the ducts connected with said lower outlet openings are oriented obliquely downwardly toward said particle carrier in a direction away from said particle path centerline.

18. Apparatus according to claim 17, wherein said particle carrier is a conveyor belt.

19. Apparatus according to claim 6, wherein said baffle means includes baffle plates and extension pieces connected at the lower ends of said baffle plates, said extension pieces forming a guide chute for directing that portion of said particle mixture passing through said space onto said particle carrier.

20. Apparatus according to claim 19, wherein each of said extension pieces are adjustable with respect to respective ones of said baffle plates connected thereto.

21. Apparatus according to claim 20, further comprising a distributing chamber for housing said classifying means, wherein said upper and lower outlet openings are substantially uniformly distributed across the width of said distributing chamber with said outlet openings arranged in a mirror image-relationship at opposite sides of a centerplane through which said path centerline extends.

22. Apparatus according to claim 19, further comprising a pair of driven and reciprocated spiked rolls positioned below a chute formed by said transverse plates for assisting in uniformly spreading that portion of the particle mixture passing between said lower outlet openings.

23. Apparatus according to claim 22, wherein said spiked rolls are disposed at right angles to the direction of motion of said particle carrier, and wherein roll driving means are provided for rotating said spiked rolls in opposite directions of rotation with respect to one another.

24. Apparatus according to claim 23, wherein said roll driving means includes means for rotating said spiked rolls such that, as viewed in the direction of the axes of rotation of said spiked rolls, the left most spiked roll rotates counterclockwise and the right most spiked roll rotates clockwise, with a consequent outward dispersion of said particles with respect to said particle path centerline.

25. Apparatus for spreading a mixture of particles onto a particle carrier for subsequent press-forming into fiberboards and the like;

said apparatus comprising;

particle supply means spaced vertically from said particle carrier and including means for supplying a mixture of particles to said particle carrier such that said mixture falls downwardly towards said particle carrier with a particle path centerline extending downwardly from said particle supply means to said particle carrier;

upper particle classifying means disposed between said particle supply means and said particle carrier and including at least one upper conduit means at each of oppOsite lateral sides of the path centerline, the upper conduit means at one side of the path centerline having at least one upper outlet opening which faces a corresponding at least one upper outlet opening of the upper conduit means at the other side of the path centerline, said upper outlet openings being spaced from one another in a direction transverse to said path centerline to permit passage thereby of portions of said mixture while gas under pressure is discharged from said upper outlet openings to effect a classification of the particles with the finer particles spaced further from the path centerline than the coarser particles;

lower particle classifying means disposed between said upper particle classifying means and said particle carrier and including at least one lower conduit means at each of said opposite lateral sides of the path centerline, the lower conduit means at one side of the path centerline having at least one lower outlet opening facing in one direction away from the path centerline and the lower conduit means at the other side of the path centerline having at least one lower outlet opening facing in an opposite direction away from the path centerline, said at least one lower outlet opening at the one side of said centerline path being spaced from the at least one lower outlet opening at the other side of the centerline path to form a space therebetween for the passage therethrough of a portion of the particle mixture without further classification by said lower particle classifying means while other portions of the particle mixture pass outwardly of said lower outlet openings and are further classified by gas under pressure exiting from said lower outlet openings, whereby boards can be constructed with that portion of the particle mixture which is classified only by the upper classifying means forming central board sections and that portion of the particle mixture which is classified by both the upper and lower classifying means forming edge board sections.

26. Apparatus according to claim 25, wherein said gas under pressure is air, and wherein separate means are provided for controlling the velocity of the air exiting from the respective upper and lower outlet openings.

27. Apparatus according to claim 25, wherein baffle means are disposed at respective opposite sides of the space formed between the lower outlet openings for adjusting the flow of gas in said space and for guiding that portion of said particle mixture passing through said space.

28. Apparatus according to claim 25, wherein said mixture consists of superfine, fine and coarser glue-covered chips for the subsequent formation of fiberboards.

29. Apparatus according to claim 25, wherein said conduit means includes register groups having ducts connecting the source of pressurized gas to each of respective ones of said outlet openings.

30. Apparatus according to claim 29, wherein the ducts connected with said lower outlet openings are oriented obliquely downwardly toward said particle carrier in a direction away from said particle path centerline.