EP3579724B1 - Procédé de fabrication d'une soie synthétique creuse, soie synthétique creuse et pinceau comprenant de telles soies synthétiques creuses - Google Patents

Procédé de fabrication d'une soie synthétique creuse, soie synthétique creuse et pinceau comprenant de telles soies synthétiques creuses Download PDF

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Publication number
EP3579724B1
EP3579724B1 EP17908331.6A EP17908331A EP3579724B1 EP 3579724 B1 EP3579724 B1 EP 3579724B1 EP 17908331 A EP17908331 A EP 17908331A EP 3579724 B1 EP3579724 B1 EP 3579724B1
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EP
European Patent Office
Prior art keywords
hollow synthetic
bristle
synthetic bristle
tipping
chemically
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.)
Active
Application number
EP17908331.6A
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German (de)
English (en)
Other versions
EP3579724A4 (fr
EP3579724C0 (fr
EP3579724A1 (fr
Inventor
Maria Ragnarsson
Fredrik HEINSJÖ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Orkla House Care AB
Original Assignee
Orkla House Care AB
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Filing date
Publication date
Application filed by Orkla House Care AB filed Critical Orkla House Care AB
Priority claimed from PCT/SE2017/051195 external-priority patent/WO2018203783A1/fr
Publication of EP3579724A1 publication Critical patent/EP3579724A1/fr
Publication of EP3579724A4 publication Critical patent/EP3579724A4/fr
Application granted granted Critical
Publication of EP3579724C0 publication Critical patent/EP3579724C0/fr
Publication of EP3579724B1 publication Critical patent/EP3579724B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/02—Bristles details
    • A46D1/0246—Hollow bristles
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B15/00—Other brushes; Brushes with additional arrangements
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/02—Bristles details
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/02—Bristles details
    • A46D1/0207—Bristles characterised by the choice of material, e.g. metal
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/02—Bristles details
    • A46D1/0238—Bristles with non-round cross-section
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/04—Preparing bristles
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/20—Brushes for applying products to surfaces in general
    • A46B2200/202—Applicator paint brush
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/02—Bristles details
    • A46D1/0292—Bristles having split ends
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2973—Particular cross section
    • Y10T428/2975—Tubular or cellular

Definitions

  • the present invention relates to a method of producing a hollow synthetic bristle, a hollow synthetic bristle and a paint brush comprising a plurality of such hollow synthetic bristles.
  • Synthetic bristles i.e. monofilaments
  • Much work has been done in the trade to improve paint pickup and paint release of paint brushes by experimenting with blends of different polymers, configurations, and cross-sections.
  • Natural fibres having split ends are known to hold paint more effectively and the multitude of small hairs at the tip section of each bristle to create a finer, smoother surface finish.
  • Hollow paint brush synthetic bristles have become more and more popular since they have a good paint pick up. However, no hollow synthetic bristles providing a similar efficiency as the natural fibres regarding the combination of holding paint and creating a finer surface finish has yet been satisfactorily achieved.
  • US4,381 ,325 A describes a method for providing a brush with ocatafoliate cross-section bristles with improved paint pickup.
  • Finish treatment or processing of the tip section of synthetic bristles can be achieved mechanically or chemically.
  • Mechanical tapering can be achieved by passing the bristle over a rotating grindstone.
  • Chemical tapering can be achieved by dipping an end portion of a bristle or bundle of bristles into a chemical tipping fluid, such as a caustic base or acid , to a certain bristle and/or bundle depth.
  • hollow synthetic bristles cannot be satisfactorily tapered by means of chemical tipping according to present tapering methods, because of the capillary action drawing the chemical tipping fluid into a non-controllable inside depth of the hollow synthetic bristle.
  • a disadvantage with mechanical tapering is that hollow synthetic bristles are readily damaged when subjected to known commercial tapering machines and methods.
  • paint brushes having synthetic bristles are easier to clean and usually are less expensive than paint brushes having natural fibres.
  • Another object of the invention is to provide paint brush synthetic bristles with optimised performance/characteristics, e.g. in regard of tailored stiffness, i.e. lower stiffness at their tips and higher stiffness closer to their roots.
  • a further object of the present invention is to provide a method of chemically flagging/fraying free ends of hollow synthetic bristles such that their free ends are flagged/fringed "enough", i.e. not too much or too little.
  • their free ends comprise an optimised shape and/or number and/or size of useful split ends/frays being two, three or a plurality of smaller and/or fractional ends at the free end section of each hollow synthetic bristle and to provide such inventive hollow synthetic bristles for manufacture of paint brushes.
  • the method according to the invention make the free ends of the hollow synthetic bristles tattered and torn by chemically dividing them/splitting them up/disunite them into more and smaller free ends out of one larger free end.
  • These hollow synthetic bristles each comprising a multi-tipped free end, i.e. a free end comprising at least two "micro” tips, instead of only one "macro” tip, accomplishing improved paint pickup, paint release and fine and smooth surface finish.
  • a method of producing a hollow synthetic bristle for a paint brush comprising; arranging a first end of the hollow synthetic bristle in a holder, immersing a part of a second end of the hollow synthetic bristle in a chemically tipping fluid, lifting up the hollow synthetic bristle from the chemically tipping fluid after a period of time, wherein the part of the hollow synthetic bristle that is immersed in the chemically tipping fluid is 1 - 30% of the length of the hollow synthetic bristle.
  • tipping is throughout this document hereby meant any processing or finish treatment suitable to be applied to a tip section of a synthetic bristle, such as a modified method of tapering and flagging.
  • a finish treatment or processing of the free or second end of the hollow synthetic bristle including chemical tipping of between 1 - 30% of the length of the hollow synthetic bristle.
  • bristle an elongated flexible body having a first end and a second end.
  • the first end is part of a root section where the bristle may be contained in and/or fastened in a bristle carrier.
  • the second end of the bristle forms a free tip which usually contacts a surface to be coated with paint.
  • the second end is part of a tip section of the bristle.
  • the hollow synthetic bristle may be produced from a wide variety of thermoplastic polymers, such as polyamides, polyesters and polyolefins.
  • the cross-sectional area of the hollow synthetic bristle may be cylindrical or oval shaped or S-shaped and the hollow synthetic bristle may have an approximate even wall thickness along the length of the synthetic bristle before being chemically tipped.
  • the hollow synthetic bristle may be between 40 - 100 mm long.
  • the hollow synthetic bristle may comprise one or more longitudinal cavities extending from an opening in the free or second end of the synthetic bristle toward the first end of the synthetic bristle.
  • the one or more longitudinal cavities may extend along a part of the length of the synthetic bristle or along the whole length of the synthetic bristle making the synthetic bristle partly hollow along its length or hollow along its full length similar to a tube.
  • the one or more longitudinal cavities may, but do not have to, be in exact alignment with the central axis of the synthetic bristle. Such a cavity may also extend at an angle relative the longitudinal extension and the extension of the central axis of a synthetic bristle.
  • a hollow synthetic bristle having a satisfactorily tipped section.
  • the tip section corresponding to the part of the second end of the hollow synthetic bristle being immersed in the chemically tipping fluid.
  • the chemical tipping reduces the wall thickness of the hollow synthetic bristle on both its outside and inside surface.
  • the reduced wall thickness obtained by tipping the outside surface of the hollow synthetic bristle provides a tapered synthetic bristle.
  • the reduced wall thickness obtained by tipping the inside surface of the hollow synthetic bristle provides a larger hollow cavity within the tipped part of the synthetic bristle which accommodates an increased capability of paint pickup.
  • the chemical tipping flag the tipped part of the hollow synthetic bristle into a plurality of split ends or tips, which accommodates a further increased capability of paint pickup, paint release and creation of a fine and smooth surface finish.
  • the method according to the invention make the free ends of the hollow synthetic bristles tattered and torn by chemically dividing them/splitting them up/disunite them into more and smaller free ends out of one larger free end.
  • These hollow synthetic bristles each comprising a multi-tipped free end, i.e. a free end comprising at least two "micro” tips, instead of only one "macro" tip.
  • the outer diameter of the hollow synthetic bristle is 0,3 - 1.0mm.
  • the inner diameter of the hollow synthetic bristle is equal to or larger than 0,15mm.
  • the hollow synthetic bristle achieves a capillary force that is strong enough to suck in the chemically tipping fluid and at the same time release the chemically tipping fluid to stop the reaction between the bristle and the chemically tipping fluid.
  • length of the part of the hollow synthetic bristle that is immersed in the chemically tipping fluid is equal to or smaller than 20mm.
  • the part of the hollow synthetic bristle that is immersed in the chemically tipping fluid is 10 - 30%, 10 - 25% or 10 - 20% of the length of the hollow synthetic bristle.
  • the part of the hollow synthetic bristle that is immersed in the chemically tipping fluid is 10 - 30%, 10 - 25% or 10 - 20% of the length of hollow synthetic bristle.
  • the length of the part of the hollow synthetic bristle that is immersed in the chemically tipping fluid is 1 - 20 mm, 5 - 15 mm or about 10 mm.
  • the chemically tipping fluid comprises sodium hydroxide (NaOH).
  • the method may thereby comprise applying a chemically tipping fluid, which may be a sodium hydroxide, to the part of the second end of the hollow synthetic bristle.
  • the chemically tipping fluid may be a sodium hydroxide solution or any other suitable lye being highly soluble in water producing a caustic basic solution.
  • the sodium hydroxide solution may comprise 30 - 40% sodium hydroxide and 60 - 70% water and be heated to approximately 100 C°.
  • the chemical tipping may be provided by immersing the part of the second end of the hollow synthetic bristle one or more times into the chemically tipping fluid, such as the sodium hydroxide solution.
  • the chemical tipping may be provided by immersing the part of the second end of the hollow synthetic bristle with a varying depth/distance into the chemically tipping fluid during the time duration in the tipping fluid.
  • the immersed part of the second end of the hollow synthetic bristle may be lifted up and down in tipping fluid at different time rates and/or velocities and/or stepwise. It may be held immersed at different depths and with varying duration at each depth or immersed in steps and with varying depth and/or held immersed with the same or different duration at each step.
  • a wall thickness of the hollow synthetic bristle is from about 0.05 - 0.1 mm and/or between 0.05 - 0.1 mm.
  • the chemically tipped part of the second end of the synthetic bristle may comprise a thinner wall thickness compared to the non-tipped remaining part of the synthetic bristle.
  • the hollow synthetic bristle(s) may be dipped into the chemically tipping solution, such as the sodium hydroxide solution, preferably in between 30 - 60 minutes and/or about 30 minutes and/or about 60 minutes or for a period of time being more or less.
  • the chemically tipping solution such as the sodium hydroxide solution
  • lifting up the hollow synthetic bristle from the chemically tipping fluid is made after such a period of time that the part of the hollow synthetic bristle has been partly decomposed in the chemically tipping fluid.
  • lifting up the hollow synthetic bristle from the chemically tipping fluid is made after such a period of time that longitudinal parts of the hollow synthetic bristle has been decomposed in the chemically tipping fluid and the second end of the hollow synthetic bristle has two or more tips.
  • the period of time is such that 1 - 30% of the part of the hollow synthetic bristle that is immersed in the chemically tipping fluid is decomposed in the chemically tipping fluid.
  • the method further comprising immersing the second end of the hollow synthetic bristle in water after it has been lifted up from the chemically tipping fluid.
  • the hollow synthetic bristle is a hollow polyester bristle.
  • the method further comprises the step of drying the hollow synthetic bristle.
  • the wall thickness of the hollow synthetic bristle is 0.05 - 0.4 mm, 0,05 - 0,2mm or 0.05-0,1mm.
  • the wall thickness effects how long the chemically tipping fluid needs to interact with the material of the bristle to achieve the desired split ends of the bristle.
  • the method further comprising washing the hollow synthetic bristle in water after it has been lifted up from the chemically tipping fluid.
  • washing the hollow synthetic bristle in water the reaction between the hollow synthetic bristle and the chemically tipping fluid could be stopped in a controlled way.
  • the method further comprising the step of enclosing the circumference of the hollow synthetic bristle with a sheet of synthetic material before the step of immersing.
  • the method further comprising the step of arranging a bundle of hollow synthetic bristles in the holder.
  • the method further comprising the step of enclosing the circumference of the bundle of hollow synthetic bristles with a sheet of synthetic material before the step of immersing.
  • the hollow synthetic bristle have a annular cross section
  • the invention also relates to a hollow synthetic bristle obtained by the above method.
  • the invention also relates to a paint brush comprising a plurality of hollow synthetic bristles as described above.
  • a paint brush having an improved paint pickup and paint release.
  • the paint brush may comprise a handle, a bristle carrier and a plurality of bristles attached to the handle by means of an adhesive and/or the bristle carrier and/or any other suitable fastening means.
  • the paint brush may comprise a blend of different types of natural and/or synthetic bristles, wherein a first type of synthetic bristles is the hollow synthetic bristles as described above.
  • the different types of bristles may include solid and hollow bristles or partly solid/hollow bristles, in a wide variety of cross-sections, including circular, oval, triangular, trilocular, tetralocular, lobate, and/or may contain multiple voids, be corrugated and/or have other structured surfaces.
  • the different types of bristles may include bristles being mechanically and/or chemically tipped.
  • the functions or steps in the method can occur out of the order noted in the operational illustrations.
  • two steps shown in succession can in fact be executed substantially concurrently or the steps can sometimes be executed in the reverse order, depending upon the functionality/acts involved.
  • the present invention relates to a hollow synthetic bristle 1 to be used together with several other synthetic bristles being the same, similar or different as a plurality or a bundle or mixture of synthetic bristles with at least one such inventive hollow synthetic bristle, preferably more than one, in paint brushes (not shown) and a paint brush comprising a plurality of such synthetic bristles 1.
  • the present invention also relates to a method of forming/shaping the synthetic bristle 1, i.e. at least a part of its free end, i.e. its second end.
  • Figs. 1a-1b show a synthetic bristle 1 according to the invention.
  • a hollow synthetic bristle 1 that has been chemically tipped according to the invention is illustrated.
  • the synthetic bristle 1 comprise a first end and a second end.
  • the synthetic bristle 1 comprise a part 2 at the second end and a remaining part 4.
  • the synthetic bristle 1 is divided into the part 2 of the second end, i.e. a tipped section, and the remaining part 4, i.e. a non-tipped section, extending from a first end (not shown) of the hollow synthetic bristle towards part 2 of the second end.
  • the tipped part 2 extends from the non-tipped remaining part 4 towards an opening 5 at the second end.
  • the tipped part 2 is part of the free end of the hollow synthetic bristle 1.
  • the hollow synthetic bristle 1 may be a tubular synthetic bristle 1 comprising a longitudinal cavity 6 extending from the opening 5 along the length of the synthetic bristle.
  • the longitudinal cavity 6 may as in the presently illustrated aspect be cylindrical, or have any other suitable shape.
  • the opening 5 /longitudinal cavity 6 has an inner diameter, i.e. the hollow synthetic bristle 1 has an inner diameter.
  • the opening 5 is circular.
  • the longitudinal cavity 6 may as in the presently illustrated aspect be an inner cavity extending along the length of the synthetic bristle. If the hollow synthetic bristle 1 is oval-shaped in cross-section the longitudinal cavity 6 may have a corresponding oval shape.
  • the hollow synthetic bristle 1 may be made from polyester and the non-tipped remaining part 4 may have an outer diameter between 0,2 - 1,0mm. According to an aspect the outer diameter is 0.2 - 0,4 mm.
  • the tipped part 2 of the second end of the synthetic bristle comprises 1 - 30% or 10 - 30% or 10 - 25% of the total length of the synthetic bristle 1.
  • the tipped part 2 of the second end of the synthetic bristle 1 comprises 10 - 20% of the total length of the synthetic bristle.
  • the wall thickness of the non-tipped remaining part 4 may be between 0.05 - 0.1 mm and the wall thickness of the tipped part 2 of the second end may be between 0.05 - 0.1 mm. In some aspects, the wall thickness of tipped part 2 of the second end is less than the wall thickness of non-tipped remaining part 4.
  • the outer diameter of the hollow synthetic bristle is 0,3 - 1.0mm before being processed according to the method.
  • the inner diameter of the hollow synthetic bristle is equal to or larger than 0,15mm before being processed according to the method.
  • the hollow synthetic bristle achieves a capillary force that is strong enough to suck in the chemically tipping fluid and at the same time release the chemically tipping fluid to stop the reaction between the bristle and the chemically tipping fluid.
  • the inner diameter is meant the diameter of the circular longitudinal cavity 6. If the cross section of the longitudinal cavity 6 has another shape than circular, the shape should according to an aspect comprise a length in the smallest direction that is equal to or larger than 0,15mm.
  • length of the part of the hollow synthetic bristle that is immersed in the chemically tipping fluid is equal to or smaller than 20mm.
  • the part of the hollow synthetic bristle that is immersed in the chemically tipping fluid is 10 - 30%, 10 - 25% or 10 - 20% of the length of the hollow synthetic bristle.
  • the wall thickness of the hollow synthetic bristle is 0.05 - 0.4 mm, 0,05 - 0,2mm or 0.05-0,1mm.
  • a cross-section A-A of the chemically tipped hollow synthetic bristle 1 of Fig. 1a is shown, wherein the applied chemical tipping has reduced the wall thickness of both the inside and the outside surface of tipped part 2 of the second end of the hollow synthetic bristle 1.
  • a tapered synthetic bristle 1 having a longitudinal cavity 6 which cross-sectional area of the bristle wall is decreased in the tipped part 2 of the second end of the hollow synthetic bristle 1 being immersed into a chemically tipping fluid.
  • the cross-sectional area of the cavity 6 is larger in the tipped part 2 of the second end of the hollow synthetic bristle 1 than in the non-tipped remaining part 4 of the hollow synthetic bristle 1, wherein the cross-sectional area of the cavity 6 may be largest at the opening 5.
  • the tipped part 2 of the hollow synthetic bristle 1 may transition into the non-tipped remaining part 4, i.e. as seen in the direction from the second or free end and its opening 5 towards the non-tipped remaining part 4 of the hollow synthetic bristle 1.
  • a chemically tipped hollow synthetic bristle 1 being flagged according to the invention is illustrated wherein the hollow synthetic bristle 1 has been provided with a plurality of split ends or tips 7.
  • the tips 7 are provided by the chemically tipping fluid decomposing longitudinal parts along the length of the hollow synthetic bristle 1 in the second end of the hollow synthetic bristle 1.
  • the tipped part 2 of the second end of the hollow synthetic bristle 1 may be both tapered and flagged when being chemically tipped, i.e. when applying the method of producing the hollow synthetic bristle 1 according to the invention.
  • the chemical tipping corrodes through the wall of at least a part of the tipped part 2, i.e. the resulting "pit depth" of the corrosion exceeds its wall thickness, in principle a chemical flagging or cutting up or cutting "open" the tipped section 2 into more than one small end or tip 7 is accomplished.
  • the number of tips 7 enhances the bristles 1 ability to release paint in an even and effective way when the bristle 1 is used in a paint brush.
  • a first step A comprises arranging the first end (not shown) of the hollow synthetic bristle 1 in a holder (not shown).
  • the hollow synthetic bristle 1 is arranged in a holder in the form of a cage, wherein the second ends are directed downwards.
  • the following step B comprises immersing the part 2 to be tipped of the second end of the hollow synthetic bristle 1 in a chemically tipping fluid, wherein the part 2 to be tipped of the second end of the hollow synthetic bristle 1 may make up 1 - 30% of the length of hollow synthetic bristle 1.
  • the part 2 to be tipped of the second end of the hollow synthetic bristle 1 may make up 10 - 30% or 10 - 25% or 10 - 20% of the length of hollow synthetic bristle 1.
  • the part 2 to be tipped of the second end of the hollow synthetic bristle 1 may make up 1 - 20 mm, 5 -15 mm or about 10 mm of the length of hollow synthetic bristle 1.
  • the following step C comprises lifting up the hollow synthetic bristle 1 from the chemically tipping fluid after a period of time.
  • the period of time may be in between 30 - 60 minutes and/or about 30 minutes and/or about 60 minutes or for a period of time being more or less.
  • Step D and E are both optional steps wherein one of them or both may be performed after step C.
  • Step D comprises immersing the second end of the hollow synthetic bristle 1 in water or any other suitable cleaning liquid after it has been lifted up from the chemically tipping fluid.
  • the method further comprising washing the hollow synthetic bristle 1 in water after it has been lifted up from the chemically tipping fluid.
  • the washing fluid could be water, a water mixed with additives or any other suitable washing fluid.
  • Step D is done to rinse or wash off the tipping fluid from the hollow synthetic bristle 1 before further use
  • Step E comprises drying the hollow synthetic bristle 1.
  • Purpose of step E is self-explanatory.
  • the hollow synthetic bristle is at least in some aspects partly open along its envelope surface of its free end after treatment according to the invention such that the paint does not "cling" too firmly to the free end, i.e. the capillary action has less firm "grip"/capillary holding
  • the part of the hollow synthetic bristle that is immersed in the chemically tipping fluid is 10 - 30%, 10 - 25% or 10 - 20% of the length of hollow synthetic bristle.
  • the length of the part of the hollow synthetic bristle that is immersed in the chemically tipping fluid is 1 - 20 mm, 5 - 15 mm or about 10 mm.
  • the chemically tipping fluid comprises according to an aspect sodium hydroxide (NaOH).
  • the method may thereby comprise applying a chemically tipping fluid, which may be a sodium hydroxide, to the part of the second end of the hollow synthetic bristle.
  • the chemically tipping fluid is a sodium hydroxide solution or any other suitable lye being highly soluble in water producing a caustic basic solution.
  • the sodium hydroxide solution may comprise 30 - 40% sodium hydroxide and 60 - 70% water and be heated to approximately 100 C°.
  • the step of immersing the part of the second end of the hollow synthetic bristle is repeated one or more times into the chemically tipping fluid, such as the sodium hydroxide solution.
  • the chemical tipping is according to an aspect provided by immersing the part of the second end of the hollow synthetic bristle with a varying depth/distance into the chemically tipping fluid during the time duration in the tipping fluid.
  • the immersed part of the second end of the hollow synthetic bristle is lifted up and down in tipping fluid at different time rates and/or velocities and/or stepwise. It may be held immersed at different depths and with varying duration at each depth or immersed in steps and with varying depth and/or held immersed with the same or different duration at each step.
  • the chemically tipped part of the second end of the synthetic bristle comprise a thinner wall thickness compared to the non-tipped remaining part of the synthetic bristle.
  • the hollow synthetic bristle(s) may be dipped into the chemically tipping solution, such as the sodium hydroxide solution, preferably in between 30 - 60 minutes and/or about 30 minutes and/or about 60 minutes or for a period of time being more or less.
  • the chemically tipping solution such as the sodium hydroxide solution
  • the step of lifting up the hollow synthetic bristle 1 from the chemically tipping fluid is made after such a period of time that the part of the hollow synthetic bristle 1 has been partly decomposed, as disclosed in fig 2 , in the chemically tipping fluid.
  • the hollow synthetic bristle 1 decomposes the wall thickness of the second end of the hollow synthetic bristle 1 is reduced.
  • the wall thickness will be reduced to zero in some parts of the second end of the hollow synthetic bristle 1 and thereby dividing the second end into different tips 7.
  • the step of lifting up the hollow synthetic bristle from the chemically tipping fluid is made after such a period of time that longitudinal parts of the hollow synthetic bristle has been decomposed in the chemically tipping fluid and the second end of the hollow synthetic bristle has two or more tips.
  • the period of time is such that 1 - 30% of the part of the hollow synthetic bristle that is immersed in the chemically tipping fluid is decomposed in the chemically tipping fluid.
  • the method further comprising the step of enclosing the circumference of the hollow synthetic bristle with a sheet of synthetic material before the step B of immersing.
  • the method further comprising the step of arranging a bundle of hollow synthetic bristles in the holder.
  • the method further comprising the step of enclosing the circumference of the bundle of hollow synthetic bristles with a sheet of synthetic material before the step of immersing.
  • the hollow synthetic bristle 1 has a annular cross section, i.e. a ring shaped cross sectional shape.
  • the inner cavity of the hollow synthetic bristle has a circular cross section, i.e. the hollow part of the hollow synthetic bristle 1 is circular.
  • the outer dimension of the hollow synthetic bristle 1 has a circular cross section, i.e. the outer shape of the hollow synthetic bristle 1 is circular. The difference in radius of the inner circular cavity and the radius of the outer circular shape corresponds to the wall thickness of the hollow synthetic bristle 1.

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  • Brushes (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Paints Or Removers (AREA)

Claims (21)

  1. Procédé de fabrication d'une soie synthétique creuse (1) pour un pinceau, le procédé comprenant :
    - l'agencement d'au moins une première extrémité de la soie synthétique creuse (1) dans un dispositif de support,
    - l'immersion d'une partie (2) d'une seconde extrémité de la soie synthétique creuse (1) dans un fluide d'amincissement chimique,
    - l'élévation de la soie synthétique creuse (1) par rapport au fluide d'amincissement chimique après une période de temps,
    la partie (2) de la soie synthétique creuse (1) qui est immergée dans le fluide d'amincissement chimique représentant 1 à 30 % de la longueur de la soie synthétique creuse (1).
  2. Procédé selon la revendication 1, le diamètre extérieur de la soie synthétique creuse (1) étant compris entre 0,3 et 1,0 mm.
  3. Procédé selon la revendication 1 ou 2, le diamètre intérieur de la soie synthétique creuse (1) étant égal ou supérieur à 0,15 mm.
  4. Procédé selon l'une quelconque des revendications précédentes, la longueur de la partie (2) de la soie synthétique creuse (1) qui est immergée dans le fluide d'amincissement chimique étant égale ou inférieure à 20 mm.
  5. Procédé selon l'une quelconque des revendications précédentes, la partie (2) de la soie synthétique creuse (1) qui est immergée dans le fluide d'amincissement chimique représentant 10 à 30 %, 10 à 25 % ou 10 à 20 % de la longueur de la soie synthétique creuse (1).
  6. Procédé selon l'une quelconque des revendications précédentes, la longueur de la partie (2) de la soie synthétique creuse (1) qui est immergée dans le fluide d'amincissement chimique étant de 1 à 20 mm, de 5 à 15 mm ou d'environ 10 mm.
  7. Procédé selon l'une quelconque des revendications précédentes, le fluide d'amincissement chimique comprenant de l'hydroxyde de sodium (NaOH).
  8. Procédé selon l'une quelconque des revendications précédentes, une épaisseur de la paroi de la soie synthétique creuse (1) étant de 0,05 à 0,4 mm, de 0,05 à 0,2 mm ou de 0,05 à 0,1 mm.
  9. Procédé selon l'une quelconque des revendications précédentes, l'élévation de la soie synthétique creuse (1) par rapport au fluide d'amincissement chimique étant réalisée après une période de temps telle que la partie (2) de la soie synthétique creuse (1) a été partiellement décomposée dans le fluide d'amincissement chimique.
  10. Procédé selon l'une quelconque des revendications précédentes, l'élévation de la soie synthétique creuse (1) par rapport au fluide d'amincissement chimique étant réalisée après une période de temps telle que les parties longitudinales de la soie synthétique creuse (1) ont été décomposées dans le fluide d'amincissement chimique et que la seconde extrémité de la soie synthétique creuse (1) présente deux pointes (7) ou plus.
  11. Procédé selon l'une quelconque des revendications précédentes, la période de temps étant telle que 1 à 30 % de la partie (2) de la soie synthétique creuse (1) qui est immergée dans le fluide d'amincissement chimique est décomposée dans le fluide d'amincissement chimique.
  12. Procédé selon l'une quelconque des revendications précédentes, comprenant en outre l'immersion de la seconde extrémité de la soie synthétique creuse (1) dans de l'eau après qu'elle a été retirée du fluide d'amincissement chimique.
  13. Procédé selon l'une quelconque des revendications précédentes, comprenant en outre le lavage à l'eau de la soie synthétique creuse (1) après qu'elle a été soulevée du fluide d'amincissement chimique.
  14. Procédé selon l'une quelconque des revendications précédentes, la soie synthétique creuse (1) étant une soie creuse en polyester (1).
  15. Procédé selon l'une quelconque des revendications précédentes, comprenant en outre l'étape de séchage de la soie synthétique creuse (1).
  16. Procédé selon l'une quelconque des revendications précédentes, comprenant en outre l'étape consistant à entourer la circonférence de la soie synthétique creuse (1) d'une feuille de matériau synthétique avant l'étape d'immersion.
  17. Procédé selon l'une quelconque des revendications précédentes, comprenant en outre l'étape consistant à disposer un faisceau de soies synthétiques creuses (1) dans le dispositif de support.
  18. Procédé selon la revendication 17, comprenant en outre l'étape consistant à entourer la circonférence du faisceau de soies synthétiques creuses (1) d'une feuille de matériau synthétique avant l'étape d'immersion.
  19. Procédé selon l'une quelconque des revendications précédentes, la soie synthétique creuse (1) présentant une section transversale annulaire.
  20. Soie synthétique creuse (1) pour un pinceau ayant une partie à pointe chimique représentant 1 à 30 % de la longueur de la soie synthétique creuse (1), la soie synthétique creuse (1) étant obtenue par le procédé selon l'une quelconque des revendications 1 à 19.
  21. Pinceau comprenant une pluralité de soies synthétiques creuses (1) selon la revendication 20.
EP17908331.6A 2017-05-02 2017-11-30 Procédé de fabrication d'une soie synthétique creuse, soie synthétique creuse et pinceau comprenant de telles soies synthétiques creuses Active EP3579724B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE1750529A SE542116C2 (en) 2017-05-02 2017-05-02 Method of producing a hollow synthetic bristle, a hollow synthetic bristle and a paint brush comprising such hollow synthetic bristles
CN201710912103.9A CN108783874B (zh) 2017-05-02 2017-09-29 中空合成鬃毛及其制造方法、及包括其的涂料刷
CN201721275332.6U CN207626780U (zh) 2017-05-02 2017-09-29 中空合成鬃毛及包括其的涂料刷
PCT/SE2017/051195 WO2018203783A1 (fr) 2017-05-02 2017-11-30 Procédé de fabrication d'une soie synthétique creuse, soie synthétique creuse et pinceau comprenant de telles soies synthétiques creuses

Publications (4)

Publication Number Publication Date
EP3579724A1 EP3579724A1 (fr) 2019-12-18
EP3579724A4 EP3579724A4 (fr) 2020-10-07
EP3579724C0 EP3579724C0 (fr) 2024-01-24
EP3579724B1 true EP3579724B1 (fr) 2024-01-24

Family

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Application Number Title Priority Date Filing Date
EP17908331.6A Active EP3579724B1 (fr) 2017-05-02 2017-11-30 Procédé de fabrication d'une soie synthétique creuse, soie synthétique creuse et pinceau comprenant de telles soies synthétiques creuses

Country Status (6)

Country Link
EP (1) EP3579724B1 (fr)
CN (2) CN207626780U (fr)
FI (1) FI3579724T3 (fr)
LT (1) LT3579724T (fr)
SE (1) SE542116C2 (fr)
TW (1) TW201842870A (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4381325A (en) * 1979-09-10 1983-04-26 Toray Industries, Inc. Liquid retaining synthetic fiber, process for producing the same, and products
US4279053A (en) * 1979-09-24 1981-07-21 E. I. Du Pont De Nemours And Company Tri- or tetra-locular paint brush bristles
US5701629A (en) * 1995-07-19 1997-12-30 Speciality Filaments, Inc. Hollow brush bristle with radiating spokes
JP2002159345A (ja) * 2000-11-29 2002-06-04 Yasuda Kasei Kk ブラシ用毛
CN2574488Y (zh) * 2002-10-18 2003-09-24 黄锡敏 高吸漆量仿猪鬃化纤丝油漆刷
CN202536527U (zh) * 2012-04-23 2012-11-21 郏锦华 一种全降解pet塑料刷丝

Also Published As

Publication number Publication date
TW201842870A (zh) 2018-12-16
SE1750529A1 (en) 2018-11-03
EP3579724A4 (fr) 2020-10-07
EP3579724C0 (fr) 2024-01-24
SE542116C2 (en) 2020-02-25
CN108783874B (zh) 2023-01-06
EP3579724A1 (fr) 2019-12-18
CN108783874A (zh) 2018-11-13
LT3579724T (lt) 2024-04-25
CN207626780U (zh) 2018-07-20
FI3579724T3 (fi) 2024-04-23

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