Claims
- 1. A system for opening a multi-tow band and forming it into a predetermined shape suitable for use as an absorbent structure for personal care products, said system comprising:(a) a first arrangement for receiving a first tow from a tow bale having a predetermined denier units per filament, spreading the filaments in said first tow into a first tow band, and having an exit end for discharging said first tow band therefrom with a predetermined width; (b) a second arrangement for receiving a second tow from a tow bale having a predetermined denier units per filament which is different from the predetermined denier of said first tow, spreading the filaments in said second tow into a second tow band, and having an exit end for discharging said second tow band therefrom with a predetermined width; (c) an air jet opening apparatus that includes: (i) a housing; (ii) an inlet for simultaneously receiving said first and second tow bands as a multi-tow band with said first and second tow bands having been selectively combined and with one of said bands being disposed on top of the other band; (iii) an air jet for opening and controllably intermixing said multi-tow band; and (iv) an exit end for discharging said opened multi-tow band.
- 2. A system for forming a multi-tow band as defined in claim 1, wherein the width of said exit end of one of said first or second arrangement is smaller than the other, whereby said multi-tow band discharged from said exit end of said air jet opening apparatus has one tow band that is larger in width than the other.
- 3. A system for forming a multi-tow band as defined in claim 2, wherein said tow band having the larger width has a different denier per filament than the denier per filament of the other tow band.
- 4. A system for forming a multi-tow band as defined in claim 2, wherein said tow band having the larger width has a denier per filament that is less than the denier per filament of the other tow band.
- 5. A system for forming a multi-tow band as defined in claim 2, wherein the system includes a surfactant applicator located upstream of the inlet of said air opening jet for individually applying a surfactant to one or both of said tow bands.
- 6. A system for forming a multi-tow band as defined in claim 5, wherein said surfactant is applied only to said tow band having the smaller width.
- 7. A system for forming a multi-tow band as defined in claim 2, wherein the system includes a bonding agent applicator located upstream of the inlet of said air opening jet for applying a bonding agent to one or both of said tow bands.
- 8. A system for forming a multi-tow band as defined in claim 7, wherein said bonding agent is applied to said tow band having the larger width.
- 9. A system for forming a multi-tow band as defined in claim 1, wherein each of said first and second arrangements comprises a tow banding jet for receiving the respective first or second tow and spreading the tow, and at least one pair of delivery rolls disposed between said first and second banding jets, respectively, and said air opening jet apparatus, and wherein the speed at which said first and second tow bands are delivered to said air jet opening apparatus can be individually controlled.
- 10. A system for forming a multi-tow band as defined in claim 1, wherein said first and second arrangements can be individually controlled to vary the bloom of said first and second tow bands.
- 11. A system for opening a multi-tow band and forming it into a predetermined shape suitable for use as an absorbent structure for personal care products, said system comprising:(a) a first arrangement for receiving a first tow from a tow bale having a predetermined denier units per filament, spreading the filaments in said first tow into a first tow band, and having an exit end for discharging said first tow band therefrom with a predetermined width; (b) a second arrangement for receiving a second tow from a tow bale having a predetermined denier units per filament which is different from the predetermined denier of said first tow, spreading the filaments in said second tow into a second tow band, and having an exit end for discharging said second tow band therefrom with a predetermined width; and (c) an air jet apparatus which includes (i) a housing having an inlet opening for simultaneously receiving said first and second tows and having a configuration corresponding generally to the shape of said first and second tows, and having an outlet opening through which said first and second tows exit said housing as a multi-layered tow having a configuration corresponding generally to said predetermined shape; (ii) an air jet formed within the housing adjacent said inlet opening thereof to create a venturi which moves the first and second tows through the air opening jet apparatus and which also further opens the first and second tows; (iii) a source of compressed air communicating with said air jet to provide carrier air for moving said first and second tows through said jet apparatus; (iv) a forming chamber within the housing and downstream of the air jet that includes a gradually increasing cross-sectional area in the direction of flow of the first and second tows that corresponds to said predetermined shape, said air jet being disposed within said housing to cause said first and second tows to be fully opened and to substantially fill said forming chamber as they move therethrough; (v) an accumulating chamber located within said housing downstream of said forming chamber that is constructed and arranged to permit said opened first and second tows to accumulate within the accumulating chamber and be withdrawn from said housing at different flow rates through said housing outlet opening in said predetermined shape, said accumulating chamber including at least one perforated plate disposed in the path of said first and second tows and said carrier air moving therethrough to cause said first and second tows to engage said perforated plate and to cause at least some of said carrier air to pass through said perforated plate; and (vi) a control valve for maintaining the flow of said carrier air at a level that will cause at least said portion of said carrier air to pass through said perforated plate and urge said first and second tows into frictional engagement with said perforated plate with sufficient force to retard the movement of the first and second tows through said accumulating chamber and cause said first and second tows to accumulate in said accumulating chamber.
- 12. A method of opening a multi-tow band and forming it into a predetermined shape suitable for use as an absorbent structure for personal care products, said method comprising the steps of:(a) moving a first tow from a tow bale having a predetermined denier units per filament through a first arrangement to spread the filaments in said first tow into a first tow band, and discharging said first tow band therefrom with a predetermined width; (b) moving a second tow from a tow bale having a predetermined denier units per filament which is different from the predetermined denier of said first tow through a second arrangement for spreading the filaments in said second tow into a second tow band, and discharging said second tow band therefrom with a predetermined width; and (c) selectively combining said first and second tow bands into a double-layered tow band at an inlet of an air jet opening apparatus, and passing said double-layered tow band through said air jet opening apparatus for opening and controllably intermixing said double-layered tow band and discharging said double-layered tow band.
- 13. A method of opening a multi-tow band and forming it into a predetermined shape as defined in claim 12, wherein the width of the tow band discharged from one of said first or second arrangements is smaller than the other, whereby said multi-tow band discharged from an exit end of said air jet opening apparatus has one tow band layer that is larger than the other.
- 14. A method of opening a multi-tow band and forming it into a predetermined shape as defined in claim 13, wherein said tow band having the larger width has a denier per filament that is less than the denier per filament of the other tow band.
- 15. A method of opening a multi-tow band and forming it into a predetermined shape as defined in claim 13, wherein a surfactant is applied to said tow band having a smaller width downstream of said air jet opening apparatus.
- 16. A method of opening a multi-tow band and forming it into a predetermined shape as defined in claim 13, wherein a bonding agent is applied to said tow band having the larger width downstream of said air jet opening apparatus.
- 17. A method of opening a multi-tow band and forming it into a predetermined shape suitable for use as an absorbent structure for personal care products, said method comprising the steps of:(a) moving a first tow from a tow bale having a predetermined denier units per filament through a first arrangement to spread the filaments in said first tow into a first tow band, and discharging said first tow band therefrom with a predetermined width; (b) moving a second tow from a tow bale having a predetermined denier units per filament which is different from the predetermined denier of said first tow, spreading the filaments in said second tow into a second tow band, and discharging said second tow band therefrom with a predetermined width; (c) creating a jet of carrier air for moving the first and second tow bands through a housing from an inlet opening to an outlet opening; (d) moving said first and second tow bands through a forming chamber within said housing having a gradually increasing cross-sectional area in the direction of flow of the first and second tow bands to partially open the first and second tow bands; (e) moving the first and second tow bands into an accumulating chamber downstream of said forming chamber while causing said first and second tow bands to engage at least one perforated plate positioned in the path of said first and second tow bands and causing at least a portion of said carrier air to flow outwardly through said perforated plate; and (f) regulating the flow of said carrier air to cause the carrier air to urge the first and second tow bands into frictional engagement with said perforated plate with sufficient force to retard the movement of the first and second tow bands through the accumulating chamber and cause the first and second tow bands to accumulate within said accumulating chamber at a greater density than it has in said forming chamber.
- 18. A system for opening a multi-tow band and forming it into a predetermined shape suitable for use as an absorbent structure for personal care products, said system comprising:(a) a first arrangement for receiving a first tow from a tow bale having a predetermined denier units per filament, spreading the filaments in said first tow into a first tow band, and having an exit end for discharging said first tow band therefrom with a predetermined width; (b) a second arrangement for receiving a second tow from a tow bale having a predetermined denier units per filament which is different from the predetermined denier of said first tow, spreading the filaments in said second tow into a second tow band, and having an exit end for discharging said second tow band therefrom with a predetermined width; (c) a first air jet opening apparatus that includes: (i) a housing; (ii) an inlet for receiving said first tow band delivered from the exit end of a first banding jet; (iii) an air jet for opening said first tow band; and (iv) an exit end for discharging said opened first band; (d) a second air jet opening apparatus that includes: (i) a housing; (ii) an inlet for receiving said second tow band delivered from the exit end of a second banding jet; (iii) an air jet for opening said second tow band; and (iv) an exit end for discharging said opened second tow band; and (e) an arrangement downstream of said first and second air jet opening apparatus disposed to receive said tow bands discharged therefrom and to selectively combine and controllably intermix said tow bands into a multi-tow band.
- 19. A system for forming a multi-tow band as defined in claim 18, wherein the width of said exit end of one of said first or second arrangements is smaller than the other, whereby said multi-tow band formed at said exit ends of said first and second air jet opening apparatus has one tow band that is larger in width than the other.
- 20. A system for forming a multi-tow band as defined in claim 19, wherein said tow band having the larger width has a denier per filament that is less than the denier per filament of the other tow band.
- 21. A system for forming a multi-tow band as defined in claim 19, wherein the system includes a surfactant applicator located upstream of the inlet of one or both of said first and second air opening jets for individually applying a surfactant to one or both of said tow bands.
- 22. A system for forming a multi-tow band as defined in claim 21, wherein said surfactant is applied only to said tow band having the smaller width.
- 23. A system for forming a multi-tow band as defined in claim 19, wherein the system includes a bonding agent applicator located upstream of the inlet of one or both of said first and second air opening jets for applying a bonding agent to one or both of said tow bands.
- 24. A system for forming a multi-tow band as defined in claim 23, wherein said bonding agent is applied to said tow band having the larger width.
- 25. A system for forming a multi-tow band as defined in claim 18, wherein said first and second arrangements can be individually controlled to vary the bloom of said first and second tow bands.
- 26. A method of opening a multi-tow band and forming it into a predetermined shape suitable for use as an absorbent structure for personal care products, said method comprising the steps of:(a) moving a first tow from a tow bale having a predetermined denier units per filament through a first arrangement to spread the filaments in said first tow into a first tow band, and discharging said first tow band therefrom with a predetermined width; (b) moving a second tow from a tow bale having a predetermined denier units per filament which is different from the predetermined denier of said first tow through a second arrangement and spreading the filaments in said second tow into a second tow band, and discharging said second tow band therefrom with a predetermined width; (c) moving said first tow band discharged from said first arrangement to a first air opening jet for opening and blooming said first tow band, and discharging said first tow band therefrom; (d) moving said second tow band discharged from said second arrangement to a second air opening jet for opening and blooming said second tow band, and discharging said second tow band therefrom; (e) selectively combining and controllably intermixing said first and second tow bands discharged from said first and second air opening jets to form a composite multi-tow band.
- 27. A method of opening a multi-tow band and forming it into a predetermined shape as defined in claim 26, wherein the width of the tow band discharged from one of said first or second arrangements is smaller than the other, whereby said multi-tow band has one tow band layer that is larger than the other.
- 28. A method of opening a multi-tow band and forming it into a predetermined shape as defined in claim 27, wherein said tow band having the larger width has a denier per filament that is less than the denier per filament of the other tow band.
- 29. A method of opening a multi-tow band and forming it into a predetermined shape as defined in claim 27, wherein a surfactant is applied to said tow band having a smaller width.
- 30. A product formed by the method defined in claim 12.
- 31. A product formed by the method defined in claim 17.
- 32. A product formed by the method defined in claim 26.
Parent Case Info
This application is a continuation-in-part application of U.S. patent application Ser. No. 09/426,268, filed Oct. 25, 1999 now U.S. Pat No. 6,253,431.
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Number |
Date |
Country |
0 357 257 |
Jul 1990 |
EP |
7-496111 |
Mar 1984 |
JP |
WO 8303267 |
Sep 1983 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09/426268 |
Oct 1999 |
US |
Child |
09/679681 |
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US |