US3237270A - Stuffer box crimper with composite crimper discs - Google Patents
Stuffer box crimper with composite crimper discs Download PDFInfo
- Publication number
- US3237270A US3237270A US329684A US32968463A US3237270A US 3237270 A US3237270 A US 3237270A US 329684 A US329684 A US 329684A US 32968463 A US32968463 A US 32968463A US 3237270 A US3237270 A US 3237270A
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- US
- United States
- Prior art keywords
- crimper
- discs
- composite
- rolls
- tow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
- D02G1/12—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes
Definitions
- This invention relates to apparatus for crimping synthetic filamentary tow and more particularly to means for extending the useful life of a stutter-box crimper. Still more particularly, this invention relates to a novel composite crimper disc.
- the composite crimper disc of this invention can be advantageously utilized in the stuffer-box crimper disclosed by Hitt in US. Patent 2,311,174, dated February 1 6, 1943, which also recognizes the desirability of installing crimper discs at each side of and below the line of contact (nip) of the two crimping rolls to control the path of tow from the nip of the rolls into the stuffer box.
- crimper discs To prevent entanglement of filaments between the ends of the crimper rolls and the crimper discs, it is necessary that a firm, rubbing contact between the ends of the rolls and the crimper discs be maintained.
- crimper discs comprising a relatively hard material such as a ceramic results in an unacceptable rate of wear on the edges of the crimper rolls whereas the use of a relatively soft material disc such as phosphor bronze entails frequent interruption of the process to replace discs worn by the abrasive action of compressed filamentary tow passing over their surface.
- a relatively soft material disc such as phosphor bronze
- attempts to employ solid, synthetic polymeric crimper discs of generally accepted lubricous and abrasion-resistant characteristics were not entirely successful due to the poor thermal conductivity which resulted in the fusion of filaments near the edges of the crimped tow.
- An object of this invention is to provide a crimper disc which has low abrasiveness with respect to the ends of the crimper rolls.
- a further object is to provide a crimper disc which has high resistance to the abrasive action of compressed filamentary tow.
- a composite crimper disc composed of a relatively soft material shell having a Rockwell hardness of less than about F-80 and a relatively hard material insert having a hardness of at least 200 Brinell which is positioned in the area which will receive the greatest compressive loading by the filamentary tow in use.
- the relatively soft material shell can be a bronze comprising approximately, by weight, 85% copper, 5% tin, 5% zinc and 5% lead, which is free of oxygen, and is machined to form a cavity in the area which will receive the greatest compressive loading.
- the hard material insert can be a cast iron shaped to fit and pressed into the cavity, the final assembly being machined to the desired flatness and smoothness tolerances.
- the working surface in contact with the crimper rolls can be coated with a lubricous material, such as a polyfiuorocarbon enamel, to provide effective lubrication with the crimper rolls. It is preferred not to coat the area in contact with the filamentary tow due to the abrasiveness of most synthetic filamentary tows under compressive loading.
- FIGURE 1 is an elevation view of a stutter-box crimper, partially in cross-section, the section being taken as indicated by line 1--1 in FIGURE 2;
- FIGURE 2 is a cross-sectional view taken along the line 22 of FIGURE 1;
- FIGURES 3 and 4 are details of the composite crimper disc with the insert of a harder material.
- synthetic filamentary tow 1 is forwarded into contact with crimping rolls 2 and 3 and into stuffer box 4.
- Crimping roll 3 is driven by means not shown and crimping roll 2 is an idler, urged into contact with the tow by means schematically represented by spring 5.
- the approach of crimper roll 2 toward crimping roll 3 may be limited by adjustable stop 6.
- Clapper 7 restricts egress of the crimped tow from the stulfer box, which requires that the synthetic filamentary tow 1 be placed under high compression at the nip of crimping rolls 2 and 3 in order to be forwarded into stuifer box 4.
- FIGURE 2 is a vertical cross-sectional view taken along line 22 of FIGURE 1 and shows the positioning of crimper discs 10 in relation to crimper rolls 2 and 3, the inserts 11 being positioned in the area of greatest compressive contact with the tow.
- FIGURES 3 and 4 are details of crimper discs 10 and show the shape of the preferred embodiment with the harder material insert 11.
- the composite crimper discs of this invention can be composed of various soft material shells such as bronze compositions, aluminum and copper, which have hardnesses below Rockwell F-80.
- various grades of cast iron with low friction and self-lubricating characteristics and a hardness of at least 200 Brinell have been found to be suitable.
- the thermal conductivity and coefficient of thermal expansion should closely approximate that of the soft material shell.
- Suitable lubricous coatings for the soft material shell include Teflon (tetrafluoroethylene-fluorocarbon resin), Trademark Registration No. 418,698, dated January 18, 1946, by E. I. du Pont de Nemours and Co., Vydax (fluorocarbon telomers), Trademark Registration No.
- the present invention provides a simply-fabricated and easily installed crimper disc which is effectual in the reduction of wear rate by synthetic filamentary tow.
- the wear observed on the soft material shell of the composite crimper disc downstream (relative to travel of the tow) from the harder material insert has been found to be substantially less than the observed in the same area when using discs of all-bronze construction. Wear in the critical central area of the composite crimper disc, where compressive, rubbing contact with the tow is greatest, has been found to occur at A to the rate experienced with all-bronze discs.
- a stuffer box associated with said crimper rolls to accommodate the entry of said synthetic filamentary tow and crimper discs positioned on each side of and below the nip of said crimping rolls so that the central portion of said crimper discs receive the greatest compressive contact with said synthetic filamentary tow
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
' March 1, 1966 3,237,270
STUFFER BOX CRIMPER WITH COMPOSITE GRIMPER nIscs F. s. DENNIS Filed Dec. 11 1965 1 NVEN TOR F260 $777/VL5Y MAM/As,
mlllllll BY Mm flGEA/T United States Patent 3,237,270 STUFFER BOX CRIMPER WITH COMPOSITE CRIMPER DISCS Fred Stanley Dennis, Kinston, N.C., assignor to E. I. du
Pont de Nemours and Company, Wilmington, Del., a
corporation of Delaware Filed Dec. 11, 1963, Ser. No. 329,684 6 Claims. (Cl. 28-1) This invention relates to apparatus for crimping synthetic filamentary tow and more particularly to means for extending the useful life of a stutter-box crimper. Still more particularly, this invention relates to a novel composite crimper disc.
The composite crimper disc of this invention can be advantageously utilized in the stuffer-box crimper disclosed by Hitt in US. Patent 2,311,174, dated February 1 6, 1943, which also recognizes the desirability of installing crimper discs at each side of and below the line of contact (nip) of the two crimping rolls to control the path of tow from the nip of the rolls into the stuffer box. To prevent entanglement of filaments between the ends of the crimper rolls and the crimper discs, it is necessary that a firm, rubbing contact between the ends of the rolls and the crimper discs be maintained. The use of crimper discs comprising a relatively hard material such as a ceramic results in an unacceptable rate of wear on the edges of the crimper rolls whereas the use of a relatively soft material disc such as phosphor bronze entails frequent interruption of the process to replace discs worn by the abrasive action of compressed filamentary tow passing over their surface. Also, attempts to employ solid, synthetic polymeric crimper discs of generally accepted lubricous and abrasion-resistant characteristics were not entirely successful due to the poor thermal conductivity which resulted in the fusion of filaments near the edges of the crimped tow.
An object of this invention is to provide a crimper disc which has low abrasiveness with respect to the ends of the crimper rolls. A further object is to provide a crimper disc which has high resistance to the abrasive action of compressed filamentary tow. Other objects will become apparent from the specification and claims.
The objects of this invention are accomplished by a composite crimper disc composed of a relatively soft material shell having a Rockwell hardness of less than about F-80 and a relatively hard material insert having a hardness of at least 200 Brinell which is positioned in the area which will receive the greatest compressive loading by the filamentary tow in use. i
More particularly, the relatively soft material shell can be a bronze comprising approximately, by weight, 85% copper, 5% tin, 5% zinc and 5% lead, which is free of oxygen, and is machined to form a cavity in the area which will receive the greatest compressive loading. The hard material insert can be a cast iron shaped to fit and pressed into the cavity, the final assembly being machined to the desired flatness and smoothness tolerances. The working surface in contact with the crimper rolls can be coated with a lubricous material, such as a polyfiuorocarbon enamel, to provide effective lubrication with the crimper rolls. It is preferred not to coat the area in contact with the filamentary tow due to the abrasiveness of most synthetic filamentary tows under compressive loading.
In the drawings, which illustrate the invention and apparatus discussed hereinafter:
FIGURE 1 is an elevation view of a stutter-box crimper, partially in cross-section, the section being taken as indicated by line 1--1 in FIGURE 2;
FIGURE 2 is a cross-sectional view taken along the line 22 of FIGURE 1;
FIGURES 3 and 4 are details of the composite crimper disc with the insert of a harder material.
With reference to FIGURE 1, synthetic filamentary tow 1 is forwarded into contact with crimping rolls 2 and 3 and into stuffer box 4. Crimping roll 3 is driven by means not shown and crimping roll 2 is an idler, urged into contact with the tow by means schematically represented by spring 5. The approach of crimper roll 2 toward crimping roll 3 may be limited by adjustable stop 6. Clapper 7 restricts egress of the crimped tow from the stulfer box, which requires that the synthetic filamentary tow 1 be placed under high compression at the nip of crimping rolls 2 and 3 in order to be forwarded into stuifer box 4. Lateral egress of synthetic filamentary tow 1 between the nip and the entrance of the stuffer box 4 at Wiper blades 8 and 9 is prevented by the presence of composite crimper discs 10, inserts 11 of harder materials being positioned as indicated. FIGURE 2 is a vertical cross-sectional view taken along line 22 of FIGURE 1 and shows the positioning of crimper discs 10 in relation to crimper rolls 2 and 3, the inserts 11 being positioned in the area of greatest compressive contact with the tow. FIGURES 3 and 4 are details of crimper discs 10 and show the shape of the preferred embodiment with the harder material insert 11.
The composite crimper discs of this invention can be composed of various soft material shells such as bronze compositions, aluminum and copper, which have hardnesses below Rockwell F-80. For the hard material insert, various grades of cast iron with low friction and self-lubricating characteristics and a hardness of at least 200 Brinell have been found to be suitable. For optimum performance, the thermal conductivity and coefficient of thermal expansion should closely approximate that of the soft material shell. Suitable lubricous coatings for the soft material shell include Teflon (tetrafluoroethylene-fluorocarbon resin), Trademark Registration No. 418,698, dated January 18, 1946, by E. I. du Pont de Nemours and Co., Vydax (fluorocarbon telomers), Trademark Registration No. 707,084, dated November 15, 1960 by E. I. du Pont Nemours and C0., other low molecular weight fluorocarbon resins, nylons, Lexan (polycarbonate resin), Trademark Registration No. 637,022, dated November 13, 1956 by the General Electric 00., aromatic polyimides and thermoset epoxy and phenolic resins. Oil-impregnated bronze is also suitable.
It is preferred to employ a circular insert due to the convenience in fabrication as well as orientation relative to the crimper rolls. However, other insert shapes can also be used and are Within the contemplation of this invention.
The present invention provides a simply-fabricated and easily installed crimper disc which is effectual in the reduction of wear rate by synthetic filamentary tow. The wear observed on the soft material shell of the composite crimper disc downstream (relative to travel of the tow) from the harder material insert has been found to be substantially less than the observed in the same area when using discs of all-bronze construction. Wear in the critical central area of the composite crimper disc, where compressive, rubbing contact with the tow is greatest, has been found to occur at A to the rate experienced with all-bronze discs.
Since many different embodiments of the invention may be made without departing from the spirit and scope there of, it is to be understood that the invention is not limited by the specific illustrations except to the extent defined in the following claims.
What is claimed is:
1. In a crimper for synthetic filamentary tow having cooperating crimper rolls, a stuffer box associated with said crimper rolls to accommodate the entry of said synthetic filamentary tow and crimper discs positioned on each side of and below the nip of said crimping rolls so that the central portion of said crimper discs receive the greatest compressive contact with said synthetic filamentary tow, the improvement comprising composite crimper discs consisting of a soft material shell having a Rockwell hardness of less than about F-80 and selected from the group consisting of bronze, aluminum and=c0pper and a harder material insert positioned in the central portion of said soft material shell, said insert consisting of cast iron having a hardness of at least 200 Brinell.
2. The composite crimper discs of claim 1 wherein said soft material shell consists of aluminum.
3. The composite crimper discs of claim '1 wherein said soft material shell consists of bronze.
4. The composite crimper discs of claim 1 wherein said soft material shell consists of copper.
5. The composite crimper discs of claim 1 wherein said insert is circular in shape.
6. The composite crimper discs of claim 1 wherein said soft material shell is coated with a thin lubricous coating of a member selected from the group consisting of fluorocarbon resins, polycarbonate resins, aromatic polyimides and thermoset epoxy and phenolic resins.
References Cited by the Examiner UNITED STATES PATENTS 2,311,174 2/1943 I-Iitt a 19-66 2,933,771 4/1960 Weinstock 28-72 3,113,667 12/ 1963 McGill 28-1 3,120,692 2/1964 Crawford et al 28-72 3,160,941 12/1964 Williamson 28-1 FOREIGN PATENTS 816,778 7/1959 Great Britain.
DONALD W. PARKER, Prima'ry Examiner.
Claims (1)
1. IN A CRIMPER FO SYNTHETIC FILAMENTARY TOW HAVING COOPERATING CRIMPER ROLLS, A STUFFER BOX ASSOCIATED WITH SAID CRIMPER ROLLS TO ACCOMMODATE THE ENTRY OF SAIDY SYNTHETIC FILAMENTARY TOW AND CRIMPR DISCS POSITIONED ON EACH SIDE OF AND BELOW TH ENIP OF SAID CRIMPING ROLLS SO THAT THE CENTRAL PORTION OF SAID CRIMPER DISCS RECEIVE THE GREATEST COMPRESSIVE CONTACT WITH SAID SYNTHETIC FILAMENTARY TOW, THE IMPROVEMENT COMPRISING COMPOSITE CRIMPER
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US329684A US3237270A (en) | 1963-12-11 | 1963-12-11 | Stuffer box crimper with composite crimper discs |
LU47435A LU47435A1 (en) | 1963-12-11 | 1964-11-24 | |
GB50357/64A GB1034220A (en) | 1963-12-11 | 1964-12-10 | Improvements in or relating to stuffer-box crimpers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US329684A US3237270A (en) | 1963-12-11 | 1963-12-11 | Stuffer box crimper with composite crimper discs |
Publications (1)
Publication Number | Publication Date |
---|---|
US3237270A true US3237270A (en) | 1966-03-01 |
Family
ID=23286547
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US329684A Expired - Lifetime US3237270A (en) | 1963-12-11 | 1963-12-11 | Stuffer box crimper with composite crimper discs |
Country Status (3)
Country | Link |
---|---|
US (1) | US3237270A (en) |
GB (1) | GB1034220A (en) |
LU (1) | LU47435A1 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3600776A (en) * | 1968-11-29 | 1971-08-24 | Teijin Ltd | Stuffer crimper |
US3680181A (en) * | 1970-04-01 | 1972-08-01 | Akzona Inc | Stuffer crimping apparatus |
US4006517A (en) * | 1975-02-10 | 1977-02-08 | Teijin Limited | Stuffer box crimping apparatus |
US4730371A (en) * | 1987-02-17 | 1988-03-15 | E. I. Du Pont De Nemours And Company | Coated crimper rolls |
EP0406686A2 (en) * | 1989-07-01 | 1991-01-09 | Spinnstofffabrik Zehlendorf Ag | Wearing discs for crimping machines |
EP0732434A1 (en) * | 1995-03-16 | 1996-09-18 | Fleissner GmbH & Co. Maschinenfabrik | Stuffer box crimping device for crimping synthetic yarn tows or such like |
WO2003004743A1 (en) * | 2001-07-03 | 2003-01-16 | Saurer Gmbh & Co. Kg | Device for compression crimping |
US7152288B1 (en) * | 2005-07-07 | 2006-12-26 | Celanese Acetate Llc | Stuffer box crimper and a method for crimping |
WO2016142221A1 (en) * | 2015-03-06 | 2016-09-15 | Oerlikon Textile Gmbh & Co. Kg | Device for crimping a tow |
US20230024638A1 (en) * | 2020-01-07 | 2023-01-26 | Daicel Corporation | Crimper and method for producing tow band |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2311174A (en) * | 1940-12-06 | 1943-02-16 | Du Pont | Textile crinkler |
GB816778A (en) * | 1955-07-22 | 1959-07-22 | Ici Ltd | Apparatus for crimping artificial filaments |
US2933771A (en) * | 1955-10-10 | 1960-04-26 | Allied Chem | Crimping apparatus |
US3113367A (en) * | 1961-12-18 | 1963-12-10 | Monsanto Chemicals | Wear devices |
US3120692A (en) * | 1960-06-17 | 1964-02-11 | Eastman Kodak Co | Process for the manufacture of uniformly crimped filter tow |
US3160941A (en) * | 1962-12-04 | 1964-12-15 | Du Pont | Crimping apparatus |
-
1963
- 1963-12-11 US US329684A patent/US3237270A/en not_active Expired - Lifetime
-
1964
- 1964-11-24 LU LU47435A patent/LU47435A1/xx unknown
- 1964-12-10 GB GB50357/64A patent/GB1034220A/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2311174A (en) * | 1940-12-06 | 1943-02-16 | Du Pont | Textile crinkler |
GB816778A (en) * | 1955-07-22 | 1959-07-22 | Ici Ltd | Apparatus for crimping artificial filaments |
US2933771A (en) * | 1955-10-10 | 1960-04-26 | Allied Chem | Crimping apparatus |
US3120692A (en) * | 1960-06-17 | 1964-02-11 | Eastman Kodak Co | Process for the manufacture of uniformly crimped filter tow |
US3113367A (en) * | 1961-12-18 | 1963-12-10 | Monsanto Chemicals | Wear devices |
US3160941A (en) * | 1962-12-04 | 1964-12-15 | Du Pont | Crimping apparatus |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3600776A (en) * | 1968-11-29 | 1971-08-24 | Teijin Ltd | Stuffer crimper |
US3680181A (en) * | 1970-04-01 | 1972-08-01 | Akzona Inc | Stuffer crimping apparatus |
US4006517A (en) * | 1975-02-10 | 1977-02-08 | Teijin Limited | Stuffer box crimping apparatus |
US4730371A (en) * | 1987-02-17 | 1988-03-15 | E. I. Du Pont De Nemours And Company | Coated crimper rolls |
EP0406686A2 (en) * | 1989-07-01 | 1991-01-09 | Spinnstofffabrik Zehlendorf Ag | Wearing discs for crimping machines |
EP0406686A3 (en) * | 1989-07-01 | 1991-01-30 | Spinnstofffabrik Zehlendorf Ag | Wearing discs for crimping machines |
US5105513A (en) * | 1989-07-01 | 1992-04-21 | Spinnstofffabrik Zehlendorf Ag | Wear disks for crimping machines |
US5673466A (en) * | 1995-03-16 | 1997-10-07 | Fleissner Gmbh & Co., Maschinenfabrik | Device for crimping synthetic wraps and the like |
EP0732434A1 (en) * | 1995-03-16 | 1996-09-18 | Fleissner GmbH & Co. Maschinenfabrik | Stuffer box crimping device for crimping synthetic yarn tows or such like |
WO2003004743A1 (en) * | 2001-07-03 | 2003-01-16 | Saurer Gmbh & Co. Kg | Device for compression crimping |
US20040237211A1 (en) * | 2001-07-03 | 2004-12-02 | Mathias Stundl | Device for compression crimping |
US7318263B2 (en) | 2001-07-03 | 2008-01-15 | Saurer Gmbh & Co. Kg | Device for compression crimping |
US7152288B1 (en) * | 2005-07-07 | 2006-12-26 | Celanese Acetate Llc | Stuffer box crimper and a method for crimping |
US20070006433A1 (en) * | 2005-07-07 | 2007-01-11 | Celanese Acetate Llc | Stuffer box crimper and a method for crimping |
WO2016142221A1 (en) * | 2015-03-06 | 2016-09-15 | Oerlikon Textile Gmbh & Co. Kg | Device for crimping a tow |
CN107429437A (en) * | 2015-03-06 | 2017-12-01 | 欧瑞康纺织有限及两合公司 | For the device for deforming tow crimping |
US20230024638A1 (en) * | 2020-01-07 | 2023-01-26 | Daicel Corporation | Crimper and method for producing tow band |
Also Published As
Publication number | Publication date |
---|---|
GB1034220A (en) | 1966-06-29 |
LU47435A1 (en) | 1965-01-24 |
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