Method and apparatus for separating and recovering fractional components of carpet

• US 5,908,164 A
• Filed: 06/24/1998
• Issued: 06/01/1999
• Est. Priority Date: 07/10/1997
• Status: Expired due to Fees

• Current Assignee: Separation Oil Services, Inc.
• Original Assignee: Forrest L. Robinson, Willis R. Campbell
• Inventors: Campbell, Willis R., Robinson, Forrest L.
• Primary Examiner(s): Hail, III, Joseph J.
• Assistant Examiner(s): Hong, William
• Application Number:
  US09/103,922
• Time in Patent Office: 342 Days
• Field of Search: 241/5, 241/14, 241/24.21, 241/24.19, 241/DIG. 38, 241/19, 241/29
• US Class Current: 241/19
• CPC Class Codes: B03B 2009/067 the refuse being carpets
• CPC Class Codes: B03B 9/061 the refuse being industrial
• CPC Class Codes: B29B 17/02 Separating plastics from other materials
• CPC Class Codes: B29K 2021/00 Use of unspecified rubbers as moulding material
• CPC Class Codes: B29K 2023/12 PP, i.e. polypropylene
• CPC Class Codes: B29K 2077/00 Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
• CPC Class Codes: B29L 2031/7322 Carpets
• CPC Class Codes: Y02W 30/52 Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
• CPC Class Codes: Y02W 30/62 Plastics recycling; Rubber recycling
• CPC Class Codes: Y02W 30/66 Disintegrating fibre-containing textile articles to obtain fibres for re-use

Abstract

A process is disclosed for the separation and recovery of fractional components of used carpet. Although the disclosed process is operable with either jute-backed or vinyl-backed carpet, an alternative process is preferred for vinyl-backed carpet to permit the sequential removal of the vinyl backing with most of the fiberglass stabilizer intact. The process includes the pre-cutting and preferable pre-soaking of the used carpet into appropriate sized pieces, followed by the introduction of the pre-conditioned used carpet pieces into a cyclonic comminuter which reduces the carpet pieces into fractional components. Processes for the recovery of the separated fractional components include collecting the components from the respective discharges from the cyclonic comminuter, washing, and separating by carding, static charges, pressure gradients and the like. This effective process will allow for greater utilization of carpet recycling operations to prevent used carpet from being disposed in land fills.

Claims

1. A method of separating and recovering fractional components of carpet, comprising the steps of:

conditioning said carpet by reducing said carpet to pieces of a pre-determined range of sizes;

feeding said carpet pieces into an air flow of a cyclonic dehumidifying comminuter to separate the fractional components of said carpet pieces to create a mass of separated, entwined fractional component fibers discharged from a discharge opening of said comminuter;

filtering the air flow after being exhausted from said comminuter through a filtering mechanism to recovered fractional component fibers carried out of the comminuter with the air flow;

passing said mass of entwined fractional component fibers through a separating mechanism to separate the entwined fractional component fibers from said mass discharged from said comminuter; and

collecting said fractional component fibers from said filtering mechanism and said separating mechanism.

2. The method of claim 1 wherein said passing step includes the step of:

combing the mass of entwined fractional component fibers through a carding mechanism.

3. The method of claim 2 wherein said conditioning step further includes the step of:

pre-soaking said carpet pieces in water before said feeding step.

4. The method of claim 3 wherein said feeding step includes the step of:

setting the comminuter to a full comminution level of action to obtain a full separation of said fractional components.

5. The method of claim 4 further comprising the step of:

before said passing step, washing said entwined mass of component fibers to remove any powdery residue therefrom.

6. The method of claim 3 wherein said feeding step includes the step of:

setting the comminuter to a minimal comminution level to effect only a separation of a backing material from the carpet pieces to create a remnant carpet material.

7. The method of claim 6 further including the steps of:

after said feeding step, collecting the remnant carpet material; and

running said collected remnant carpet material through a second cyclonic dehumidifying comminuter set at a high comminution level to separate the fractional component fibers and create said mass of entwined component fibers.

8. A method of separating and recovering fractional components of vinyl-backed carpet, comprising the steps of:

conditioning said carpet by reducing said carpet to pieces of a pre-determined range of sizes;

feeding said carpet pieces into an air flow of a first cyclonic dehumidifying comminute set at a low comminution level to effect only a separation of a backing material and stabilizer material from the carpet pieces to create a first remnant carpet material;

collecting said first remnant carpet material;

running said collected remnant carpet material through a second cyclonic dehumidifying comminuter set at a high comminution level to separate the fractional components of said first remnant carpet material to create a mass of separated, entwined fractional component fibers discharged from a discharge opening of said comminuter;

filtering the air flow after being exhausted from said comminuter through a filtering mechanism to recovered fractional component fibers carried out of the comminuter with the air flow;

passing said mass of entwined fractional component fibers through a separating mechanism to separate the entwined fractional component fibers from said mass discharged from said comminuter; and

collecting said fractional component fibers from said filtering mechanism and said separating mechanism.

9. The method of claim 8 wherein said conditioning step further includes the step of:

pre-soaking said carpet pieces in water before said feeding step.

10. The method of claim 9 further comprising the steps of:

recovering said backing material and stabilizer material from said first comminuter; and

washing said first remnant carpet material to remove any powdery residue therefrom.

11. The method of claim 10 wherein said passing step includes the step of:

combing the mass of entwined fractional component fibers through a carding mechanism.

12. A method of separating and recovering fractional components of carpet, comprising the steps of:

conditioning said carpet by reducing said carpet to carpet pieces having a size within a pre-determined range of sizes;

feeding said carpet pieces into an air flow of a cyclonic dehumidifying comminuter to separate the fractional components of said carpet pieces to create a mass of separated, entwined fractional component fibers discharged from a discharge opening of said comminuter;

washing said entwined mass of component fibers to remove any powdery residue therefrom;

passing said mass of entwined fractional component fibers through a separating mechanism to separate the entwined fractional component fibers from said mass discharged from said comminuter; and

collecting said fractional component fibers from said separating mechanism.

13. The method of claim 12 wherein said feeding step includes the step of:

setting the comminuter to a minimal comminution level to effect only a separation of a backing and stabilizer material from the carpet pieces to create a remnant carpet material.

14. The method of claim 13 further including the steps of:

after said feeding step, collecting the remnant carpet material; and

running said collected remnant carpet material through a second cyclonic dehumidifying comminuter set at a high comminution level to separate the fractional component fibers and create said mass of entwined component fibers.

15. The method of claim 14 wherein said collecting step includes the step of:

screening said backing and stabilizer material from said remnant carpet material.

16. The method of claim 12 wherein said passing step includes the step of:

combing the mass of entwined fractional component fibers through a carding mechanism.

17. The method of claim 16 wherein said conditioning step further includes the step of:

pre-soaking said carpet pieces in water before said feeding step.

18. The method of claim 16 further comprising the step of:

before said passing step, washing said entwined mass of component fibers to remove any powdery residue therefrom.

19. The method of claim 18 further comprising the steps of:

setting the comminuter to a minimal comminution level to effect only a separation of a backing and stabilizer material from the carpet pieces to create a remnant carpet material;

after said feeding step, screening the backing and stabilizer material from said remnant carpet material and collecting the remaining remnant carpet material; and

running said collected remaining remnant carpet material through a second cyclonic dehumidifying comminuter set at a high comminution level to separate the fractional component fibers and create said mass of entwined component fibers.

20. The method of claim 12 further comprising the steps of:

filtering the air flow after being exhausted from said comminuter through a filtering mechanism to recovered fractional component fibers carried out of the comminuter with the air flow; and

collecting said fractional component fibers from said filtering mechanism.