US3434860A - Method and apparatus for coating tubular fabric - Google Patents

Method and apparatus for coating tubular fabric Download PDF

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Publication number
US3434860A
US3434860A US499589A US3434860DA US3434860A US 3434860 A US3434860 A US 3434860A US 499589 A US499589 A US 499589A US 3434860D A US3434860D A US 3434860DA US 3434860 A US3434860 A US 3434860A
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United States
Prior art keywords
fabric
coating material
tubular
coating
wall
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Expired - Lifetime
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US499589A
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English (en)
Inventor
Leslie A Ferguson
George M Williams
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UNIROYAL HOLDING Inc WORLD HEADQUARTERS MIDDLEBURY CONNECTICUT 06749 A CORP OF NEW JERSEY
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Uniroyal Inc
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Assigned to UNIROYAL HOLDING, INC., WORLD HEADQUARTERS, MIDDLEBURY, CONNECTICUT, 06749, A CORP OF NEW JERSEY reassignment UNIROYAL HOLDING, INC., WORLD HEADQUARTERS, MIDDLEBURY, CONNECTICUT, 06749, A CORP OF NEW JERSEY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: UNIROYAL, INC., A NEW JERSEY CORP.
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • B29C48/152—Coating hollow articles the inner surfaces thereof
    • B29C48/153—Coating both inner and outer surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2301/00—Use of unspecified macromolecular compounds as reinforcement
    • B29K2301/10—Thermosetting resins

Definitions

  • This invention relates to methods and apparatus for coating or impregnating a tubular fabric with a liquid coating material.
  • the fabric tube is passed through a coating zone wherein the fabric tube is coated or impregnated by the coating material, and often two or more passes through coating zones are made to eliminate pinholes and permit greater build-up of the coating thickness.
  • the coated tube is then passed through a curing zone where, depending on the nature of the coating material, it is either air-cured or oven-cured, or the like. It then passes on to a take-up system, preparatory to subsequent handling, packing and shipping.
  • a take-up system preparatory to subsequent handling, packing and shipping.
  • Such a process is often employed in the manufacture of garden hose, electrical insulation and other types of impervious flexible tubular conduits. It may also be used in the manufacture of impervious rigid conduits.
  • the tubular fabric having a generally flat cross-sectional shape, is taken from a let-off roll and passed through a bath or reservoir of the coating composition while in such flat form. It is then passed over a spherical or cylindrical mandrel which is located internally of the fabric tube and is held in a fixed position in space by a powerful permanent or electromagnet positioned about the fabric tube.
  • the spherical or cylindrical mandrel usually. serves to reshape the flat tube into the conventional round tube configuration.
  • the rounded tube passes through the heating and drying zone at which the coating material is cured on the round tube and the material is taken up on a take-up roller, when flexible, or cut to predetermined lengths, when rigid.
  • Coated or impregnated fabric tubes made in the foregoing manner are generally satisfactory for the purposes intended where the coating material employed is a relatively slow-setting liquid coating material, as, for example, insulating varnish, natural rubber or synthetic rubber.
  • the coating material employed is a relatively slow-setting liquid coating material, as, for example, insulating varnish, natural rubber or synthetic rubber.
  • quick-setting liquid coating materials such as polyurethanes for example
  • the bond between the coating material and the fabric tube is often inadequate due to the facts that: (l) the quick-setting material often does not sufiiciently penetrate into the fibers of the fabric tube wall; and, (2) air is often trapped at the interface of the coating material and the fibrous wall.
  • past practices have not achieved sufficient penetration of the coating material into the interstices of the fabric to produce a good, impervious coating on the tubular fabric.
  • the prior art use of a relatively stagnant bath in connection with coating the fabric tube is not practical in the case of quick-setting materials due to the fact that the materials in the bath begin to
  • Yet another object of this invention is to provide an improved method of coating tubular fabrics in which greater penetration of the coating material into the wall of the fabric is achieved.
  • Another object of this invention is to provide, in a method of coating tubular fabrics with a quick-setting liquid coating material, for the elimination of dead spaces wherein the quick-setting material can accumulate and set up prior to its being coated onto the tubular fabric.
  • Another object of this invention is apparatus for coating elongated tubular fabric with a liquid coating material which provides an improved bond between the coating material and the fabric wall.
  • Still another object of this invention is apparatus for coating tubular fabric with a liquid coating material which provides improved penetration of the coating material into the fibers and interstices of the wall of the tubular fabric.
  • the method of this invention is practiced by pulling a length of tubular fabric with a given tensile force through a coating zone adapted to receive liquid coating material and apply the material to the fabric, the tubular fabric having a predetermined wall thickness under the given tensile force; applying a radial compressive force to the wall of the tubular fabric in the coating zone to compress the thickness of the wall in the zone to at least 10% less than the predetermined thickness and expel air from the fibers therein; removing the compressive force so that the fabric wall expands to substantially the predetermined thickness and draws the coating material into the fibers thereof to replace the expelled air; and, curing the coating material on the tubular fabric.
  • An apparatus for coating elongated tubular fabric with a liquid coating material in accordance with one embodiment of this invention, the fabric being under tension and having a predetermined wall thickness when so tensioned comprises a means for creating a magnetic field; .a nonmagnetic tubular member having a predetermined inter nal diameter mounted within the magnetic field; a magnetic element located in the tubular member and having a circular cross-section of predetermined maximum diameter in at least one plane normal to the axis of the tubular member, one-half of the difference between the internal diameter and the maximum diameter being at least 10% less than the predetermined wall thickness; means to deliver the liquid coating material to the interior of the tubular member, and means to feed the tubular fabric through the tubular member with the magnetic element fitting within the tubular fabric and being magnetically held in place against withdrawal from the apparatus, whereby the wall of the tubular fabric is compressed as it passes between the tubular member and the magnetic element to squeeze entrapped air therefrom to facilitate entry of the liquid coating material thereinto.
  • FIG. 1 is .a diagrammatic view of one form of apparatus embodying the invention
  • FIG. 2 is an enlarged plan view taken along the line 22 of FIG. 1;
  • FIG. 3 is an enlarged sectional view taken along the line 3-3 of FIG. 2;
  • FIG. 4 is an enlarged sectional elevational view similar to FIG. 3 showing an alternate coating head or doctor ring assembly that may be used with this invention.
  • FIG. 5 is a sectional elevational view taken along the line 5-5 of FIG. 1.
  • FIG. 1 of the drawings there is illustrated an apparatus and method for coating or impregnating a continuous strip of tubular fabric with a liquid coating material.
  • a continuous strip of tubular fabric is supplied from a reel 11 carried by a support 12.
  • the continuous tubular strip 10 is led from reel 1.1 over a pulley 13 through a first coating head assembly, shown generally at 14, and through a second coating head assembly, shown generally at 15.
  • First and second coats of liquid coating material are applied to the tubular fabric strip 10 at assemblies 14 and 15, respectively.
  • optional heaters shown in broken lines at 16 and 17, respectively, may be employed to cure the coating material on the fabric tube.
  • the coated fabric tube After passing through the second heater 17, the coated fabric tube passes about pulley 18 and is wound up on a take-up reel 19 carried on a support 20.
  • Reel .19 is driven by suitable drive means (not shown) which cause a predetermined tension to be exerted on the taubular fabric strip 10 in order to move the fabric from let-off reel 11 through the various coating heads to take-up reel 19.
  • the liquid coating materials which are applied to fabric strip 10 at coating head assemblies 14 and may be prepared in identical reaction devices, shown generally at 21 and 22, respectively, and delivered to the coating head assemblies via conduits 23 and 24, respectively.
  • the reaction devices 21 and 22 should be positioned as closely adjacent to the coating head assemblies 14 and 15 as possible. This is done in order to facilitate rapid transfer of the quick-setting materials from the reaction devices to the coating head assemblies during operation and thus prevent gelling or setting up of the coating materials within the conduits 23 and 24.
  • the components to be reacted to form a coating material are admitted through nozzles 25, 26 and 27 and are further mixed by means of a stirrer 28 driven by a drive means, such as an electric motor 29.
  • the mixture comprising the liquid coating material thus obtained, leaves device 22 through outlet conduit 24 and leaves device 21 (FIG. 1) through outlet conduit 23.
  • the reaction devic 2 and 22 4 are supported in their respective positions adjacent coating head assemblies 14 and 15 by suitable brackets 30 and 31, respectively.
  • a preferred coating head assembly 14 is shown more clearly in FIGS. 2 and 3.
  • the assembly comprises a high strength magnet, such as the permanent magnet shown at 35, or a suitable DC electromagnet of similar strength.
  • the magnet 35 is fixed to a support wall by means of a bracket 36 and is provided with end poles 37 and 38.
  • a magnetic ball or mandrel 39 is centrally supported within the tubular fabric strip 10 by means of the magnetic lines of force passing between the end poles 37 and 38 of magnet 35.
  • a non-magnetic (e.g., brass) doctor ring 40 surrounds the fabric tube 10 and the magnetic ball 39.
  • the doctor ring 40 is positioned between the end poles 37 and 38 and, as will appear in greater detail hereinafter, it is supported in such a manner as to be adjustable relative to the end poles.
  • doctor ring 40 In order to support doctor ring 40, upper and lower support plates 41 and 42 are fixed to the outer surface of the doctor ring. Plates 41 and 42 are horizontally adjustably bolted to respective upper and lower intermediate brackets 43 and 44 by means of bolts 43a and 44a. Brackets 43 and 44, in turn, are vertically adjustably fastened to respective wall brackets 45 and 46 (FIG. 1) by means of bolts 45a and 46a. Accordingly, doctor ring 40 is capable of being horizontally and vertically adjusted relative to the magnetic poles 37 and 38 in order to allow for control over the magnetic pull which the poles exert on the magnetic ball 39. This allows the apparatus to be adjusted in such a manner as to apply coating material to the fabric tube equally about the circumference of the tube and avoid over-abundance and starved conditions therein.
  • the apparatus herein described employs the permanent magnet 35 to support magnetic ball 39.
  • electromagnets of the DC type can be used.
  • an AC electromagnet can be used in conjunction with either the permanent magnet 35 or a DC electromagnet, and the fluctuating field of the AC electromagnet may be utilized to cause a heat build-up in the mandrel 39, thereby providing means for heating the mandrel to a controlled degree.
  • a drive means associated with take-up reel 19 causes reel 19 to pull the fabric strip 10 from let-off reel 11 through coating head assemblies 14 and 15 and onto reel 19.
  • a predetermined tensile force is applied to the strip 10 at reel 19 and, although friction at the various rollers 13 and 18, coating head assemblies 14 and 15, and at let-off reel 11 causes the actual tensions at various points in strip 10 to differ from the tension in the strip at the input to reel 19, the value of the tensile stress in strip 10 at such points bears a definite relationship to the tensile stress in strip 10 at the input of reel 19.
  • the diameter of magnetic ball 39 and the internal diameter of doctor ring 40 are selected to be of such dimensions as to cause the wall portions of strip 10 passing between the point 48 (FIG. 3) of closest approach of ball 39 to the inner surface of ring 40 to be compressed at least 10% by a radial compressive force.
  • This compression causes air to be squeezed out of the wall of strip 10 within coating head assembly 14 and, upon release of the compressive force as the wall portions move past point 48, the wall portions expand and, like sponges, absorb coating mat rial thereinto.
  • the inner wall of doctor ring 40 is provided with an annular recess or groove 50 to which the conduit 23 (FIG. 1) is connected at a plurality of circumferentially spaced points via branch conduits 23a and 23b.
  • the conduits 23a and 23b enter the doctor ring 40 at an angle, rather than radially, so as to introduce a tangential rotary component of flow to the coating material in the annular grove 50. This enhances movement of the material through the groove 50 and helps avoid the formation of dead spaces or stagnant areas therein at which quick-setting coating material might gel before being applied to the fabric strip 10.
  • the arrangement of components is such that the magnetic forces acting on the ball 39 between magnetic poles 37 and 38 keep the ball 39 centered at a point just above the annular groove 50. Accordingly, as the wall portions of fabric tube begin to expand after passing the point 48 of closest approach of the ball 39 to ring 40, the wall portions come into contact with the coating material exiting from the annular groove 50. Thus, coating material is applied to the fabric tube 10 at the groove 50 and, at the same time, the expanding wall portions draw in the coating material and improve the penetration of the material into the fibers of the fabric wall.
  • the area encompassed between the point of inlet of the tubular fabric strip 10 into the doctor ring 40 and the point of exit of the fabric strip from the doctor ring is considered to be a coating zone in which coating material is applied to the strip of tubular fabric moving therethrough.
  • the radially directed compressive force which is exerted on the wall of the strip of tubular fabric at point 48 occurs within the defined coating zone.
  • the coating material prepared in reaction device 21 is delivered to the doctor ring 40 of coating head assembly 14 in a single direct pass of the coating material from the reaction device to the tubular fabric, there being no dead spaces in the interconnecting system for the accumulation of coating material during movement of the material from the reaction device to the tubular fabric.
  • reaction device 22 and coating head assembly 15 as will appear hereinafter. This is particularly desirable when quick-setting coating materials are employed in order to prevent gelling of the materials prior to their being applied to the fabric tube.
  • the speed of the tubular fabric passing through the doctor ring 40 should be adjusted to be so related to the delivery rate of the liquid coating material thereto as to insure that all of the liquid coating material delivered to the doctor ring is applied to the tubular fabrc and that sufficient liquid coating material is delivered thereto as to completely cover all of the tubular fabric passing through the doctor ring. This insures that the application of the coating material to the tubular fabric is continuously maintained without blockage thereof due to the setting up or gelling of the coating material prior to its application to the tubular fabric.
  • the diameter of the magnetic ball 39 is chosen to be at least 10% greater than the diameter of the fabric tube 10 under the tension applied to the fabric tube to move it through the coating head assembly.
  • the diameter of the fabric tube is expanded as it moves over the magnetic ball 39, thereby stretching the fabric in the walls of the tube to increase the size of the interstices of or the spacing between adjacent loops or strands in the fabric. Accordingly, as portions of the fabric walls pass by the groove 50 and the coating material is applied thereto, the coating material enters the enlarged interstices of the fabric to achieve greater penetration thereinto.
  • a tubular stretchable fabric is coated with liquid coating material by pulling the tubular fabric with a given tensile force through the coating zone, the tubular fabric having a predetermined diameter under the tensile force before entering the coating zone.
  • a radially expanding force is applied to the tubular fabric to stretch the fabric diameter at least 10% greater than the predetermined diameter in order to enlarge the interstices of the fabric and facilitate peneration of the coating material into the fabric wall in the coating zone, and then the expanding force is removed prior to the curing of the coating material so that the tubular coated fabric returns to substantially its predetermined diameter.
  • the coating material on the tubular fabric is cured, either by air curing or by the addition of heat in the heaters 16 and 17.
  • a modified coating head assembly 15 has been shown and illustrated in FIG. 4.
  • the doctor ring 40 of FIG. 3 has been replaced by a funnel-like doctor ring 55 which is provided with a conical upper end portion 56 and a cylindrical lower portion 57.
  • doctor ring 55 employs the conical end 56 as a reservoir in coating the fabric tube 10.
  • liquid coating material is delivered from reaction device 22 (FIG. 1) to the conical end 56 of doctor ring 55 by the delivery conduit 24 (FIG.
  • the rate of flow of the coating material to the doctor ring 55 being such, relative to the speed of the movement of fabric tube 10 through the doctor ring, that a slight, continuously changing, bank or reservoir 58 is formed at the conical end 56 of the doctor ring.
  • the inner diameter of the doctor ring 55 and the outer diameter of the ball 39 are so chosen as to provide for at least 10% compression of the walls of the fabric during passage of the fabric tube between the ball and the doctor ring.
  • the diameter of the ball 39 may be selected to be at least 10% greater than the inner diameter of the fabric tube 10 under the tensile force needed to pull the tube 10 through the doctor ring. As before, this is done in order to enlarge the interstices of the fabric in the walls of tube 10 when deep impregnation of the coating material into the wall of the tube is desired.
  • a cylindrical magnetic mandrel may be employed in place of magnetic ball 39.
  • a spherical mandrel or ball 39 is preferable to a cylindrical mandrel.
  • the reason for thi is that a ball will continually rotate in a random manner, causing its outer surface to be continually wiped clean and precluding the build-up of hardened coating material on the ball surface.
  • the material build-up on a cylindrical mandrel would cause improper operation of the apparatus.
  • the amount of coating material applied to the internal surface and the depth of penetration of the coating material into the fabric tube wall depend, to a great degree, on the tightness of the weave or knit of fabric tube It), the diameter of the ball 39, the internal diameter of the doctor ring 55, the tension in fabric tube 10 and the rate of delivery of coating material to the coating head assembly 15.
  • the same factors apply in the case of coating the external surfaces of fabric tubes in accordance with the embodiments previously described. Accordingly, it will be appreciated that by judiciously selecting appropriate values for the foregoing factors, the thickness of the coating on, and the depth of penetration of the coating material into, the fabric tube wall can be controlled to a relatively high degree.
  • stretchable fabric is intended to encompass knitted fabrics comprised of essentially nonstretchable yarns, such as, for example, cotton, linen, flax, silk, rayon, wool, nylon, glass, polyester, and the like, or mixtures thereof, and it is also intended to encompass woven or braided fabrics made of stretchable yarns such as, for example, spandex or yarns having elastic cores covered with fibrous material, or mixture thereof.
  • quick-setting liquid coating material is intended to encompass liquid coating materials which gel or harden within a few minutes after being prepared or reacted. It includes polyurethanes and epoxy resins, such as, for example, the air-curable coating materials prepared in accordance with the following three examples:
  • Example I A polyester is prepared from 0.98 mole of ethylene glycol, 0.42 mole of 1,2-propylene glycol and 1.0 mole of adipic acid. The polyester is reacted with toluene diisocyanate (80% 2,4-isomer and 20% 2,6-isomer) to form a polyester prepolymer. Thereafter, 100 parts by weight of this prepolymer is mixed and reacted with 11 parts by Weight of methylene-bis-ortho-chloroaniline which is heated to 290 before mixing. Suitable plasticizers, antioxidants and pigments are added as desired, depending upon the requirements of the final product.
  • the viscosity of the urethane composition is reduced to a suitable level for coating by heating the composition to 120 to 130 F. just prior to coating the tubular fabric.
  • the gel time of the foregoing composition is minutes, after which it becomes a semi-solid, well on its way toward a cure and unuseable thereafter as a coating resin.
  • Example II In this case, a polyester prepolymer similar to that prepared in Example I above is again prepared. Thereafter, 100 parts by weight of the polyester prepolymer is mixed and reacted with 13 parts by weight of methylene diamine. This formulation has a pot life (time to gel) of from to 45 seconds depending upon whether the polyester prepolymer resin is heated, or is used at room temperature.
  • Example III A prepolymer comprising a condensation product of epichlorohydrin and his phenol-A is prepared. Thereafter, 100 parts of this prepolymer is mixed with 10 parts of triethylenetetramine. In the formulation the prepolymer is heated to 250 F. (a liquid state) so that it can be mixed with the cold triethylenetetramine. This formulation has a gel time of approximately 30 minutes. However, it solidifies almost immediately, allowing handling during its curing period.
  • the greatest advantages of this invention are achieved when the invention is employed to coat tubular stretchable fabrics with quick-setting liquid coating materials.
  • the invention can also be utilized to advantage in coating other tubular fabrics in addition to stretchable fabrics.
  • the invention can be beneficially employed in coating tubular fabrics with coating materials that are not necessarily quick-setting as defined herein.
  • a method of coating tubular fabrics with a liquid coating material comprising:
  • tubular fabric is a stretchable fabric having a predetermined diameter under said tensile force, and further including:
  • a method of coating tubular, stretchable fabrics with a liquid coating material comprising:
  • said stretchable fabric is a knitted fabric having a predetermined wall thickness under said tensile force, and further including:
  • a method of coating elongated, tubular, knitted fabric with a quick-setting liquid coating material comprising the steps of:
  • a method of continuously coating a tubular fabric with a quick-setting, liquid coating material comprising the steps of:
  • the speed of the tubular fabric passing through said coating zone being related to the delivery rate of said liquid coating material thereto in such a manner as to insure that all of the liquid coating material delivered to the coating zone is applied to the tubular fabric and that suflicient liquid coating material is delivered thereto to completely cover all of the tubular fabric passing through,
  • Apparatus for coating elongated tubular fabric with a liquid coating material, the fabric being under tension and having a predetermined wall thickness when so tensioned comprising:
  • a magnetic element located in said tubular member and having a circular crosssection of predetermined maximum diameter in at least one plane normal to the axis of said tubular member, one-half of the difference between said internal diameter and said maximum diameter being at least 10% less than said predetermined wall thickness;
  • said magnetic element is spherical in shape and wherein said tubular member is provided with a circularrecess about its internal periphery, said liquid coating material being delivered to said circular recess for application to the tubular fabric, the construction and arrangement being such that said spherical magnetic element is magnetically supported immediately upstream of the circular recess within said tubular member.
  • said magnetic element is spherical in shape and wherein said tubular member is provided with a conical, funnel-shaped upstream portion, said liquid delivery means delivering said liquid coating material to the funnel-shaped upstream portion of said tubular member to form a liquid coating material bank through which said tubular fabric passes, said spherical magnetic element being magnetically supported within said tubular member at a point downstream from said conical, funnel-shaped upstream portion.

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US499589A 1965-10-21 1965-10-21 Method and apparatus for coating tubular fabric Expired - Lifetime US3434860A (en)

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FR (1) FR1500470A (enrdf_load_stackoverflow)
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3928674A (en) * 1973-06-12 1975-12-23 Ernst Theodoor Voermans Method and apparatus for producing articles of reinforced plastics or like construction
US4032677A (en) * 1972-06-12 1977-06-28 Ashimori Kogyo Kabushiki Kaisha Method of forming a coating of a rubber or a synthetic resin having an even thickness on the external surface of a tubular textile jacket
FR2577466A1 (fr) * 1985-02-21 1986-08-22 Ashimori Ind Co Ltd Materiau tubulaire de revetement a base de resines synthetiques, procede et appareil de fabrication
EP0174295A3 (en) * 1984-09-07 1987-08-19 Puck, Alfred, Prof., Dr.-Ing. Manufacturing method for tubes
US4783349A (en) * 1984-03-06 1988-11-08 Imperial Chemical Industries Plc Process for making fibre reinforced products

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA837913B (en) * 1982-11-17 1984-06-27 Marling Insulations Sleeving
DE3627519A1 (de) * 1986-08-13 1988-02-18 Overmans Olaf Elastisches material sowie verfahren und vorrichtung zu seiner herstellung
CN113718531A (zh) * 2021-08-18 2021-11-30 北京光华纺织集团有限公司 一种管状涂覆织物软管

Citations (4)

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Publication number Priority date Publication date Assignee Title
US2324645A (en) * 1940-03-14 1943-07-20 William C Prehler Apparatus for impregnating and forming fabric tubing
US2602959A (en) * 1948-03-05 1952-07-15 John M Fenlin Apparatus for making tubular conduits
US2874411A (en) * 1956-08-10 1959-02-24 Nat Standard Co Apparatus for coating and impregnating tubular fabrics
US3207616A (en) * 1961-01-23 1965-09-21 Samcoe Holding Corp Method and apparatus for treating tubular knitted fabric

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2324645A (en) * 1940-03-14 1943-07-20 William C Prehler Apparatus for impregnating and forming fabric tubing
US2602959A (en) * 1948-03-05 1952-07-15 John M Fenlin Apparatus for making tubular conduits
US2874411A (en) * 1956-08-10 1959-02-24 Nat Standard Co Apparatus for coating and impregnating tubular fabrics
US3207616A (en) * 1961-01-23 1965-09-21 Samcoe Holding Corp Method and apparatus for treating tubular knitted fabric

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032677A (en) * 1972-06-12 1977-06-28 Ashimori Kogyo Kabushiki Kaisha Method of forming a coating of a rubber or a synthetic resin having an even thickness on the external surface of a tubular textile jacket
US3928674A (en) * 1973-06-12 1975-12-23 Ernst Theodoor Voermans Method and apparatus for producing articles of reinforced plastics or like construction
US4783349A (en) * 1984-03-06 1988-11-08 Imperial Chemical Industries Plc Process for making fibre reinforced products
EP0174295A3 (en) * 1984-09-07 1987-08-19 Puck, Alfred, Prof., Dr.-Ing. Manufacturing method for tubes
FR2577466A1 (fr) * 1985-02-21 1986-08-22 Ashimori Ind Co Ltd Materiau tubulaire de revetement a base de resines synthetiques, procede et appareil de fabrication

Also Published As

Publication number Publication date
SE322337B (enrdf_load_stackoverflow) 1970-04-06
GB1166649A (en) 1969-10-08
DE1635671A1 (de) 1971-04-01
NL6614839A (enrdf_load_stackoverflow) 1967-04-24
FR1500470A (fr) 1967-11-03
BE688580A (enrdf_load_stackoverflow) 1967-03-31
USB499589I5 (enrdf_load_stackoverflow) 1900-01-01

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