US3333568A - Apparatus for coating webs - Google Patents

Apparatus for coating webs Download PDF

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Publication number
US3333568A
US3333568A US265644A US26564463A US3333568A US 3333568 A US3333568 A US 3333568A US 265644 A US265644 A US 265644A US 26564463 A US26564463 A US 26564463A US 3333568 A US3333568 A US 3333568A
Authority
US
United States
Prior art keywords
roll
overflow
film
coating
slit
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
Application number
US265644A
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English (en)
Inventor
Przybilla Rudolf
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE630393D priority Critical patent/BE630393A/xx
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to US265644A priority patent/US3333568A/en
Priority to FR929010A priority patent/FR1351881A/fr
Application granted granted Critical
Publication of US3333568A publication Critical patent/US3333568A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor

Definitions

  • slit die and cascade coating methods are known in the art, and not depending on solution viscosity and coating rate for film thickness.
  • slit die coating liquid usually emerges from the slit orifice over the width of the material to be coated
  • cascade coating the casting liquid flows from a supply vat over a fixed inclined surface, straight or slightly arched, and is carried to the point of application by the material to be coated.
  • film thickness is governed solely by the amount of emerging or overflowing liquid.
  • overflow of the film-forming liquid preparation proceeds over a roll revolving at a suitably slow speed, the rotation rate of the roll being .preferably so adjusted that it is slower that that of the passing film base and the over-fiowing liquid preparation is completely taken up by the passing film base and is not by any chance partially drained away, as in bead coating where it is desirable to maintain a bead of coating material on the roller at the nip.
  • application is effected not only by overflow phenomena, but also by entrainment of the coating liquid on rolls, so that the precision specified above is not essential to these overflow surfaces.
  • the process according to this invention makes it possible to combine the advantages of the bead coating or Wash-over method, namely utmost uniformity of the coating over the entire width of the film base along With simplicity and ruggedness of the equipment, with the advantage of permitting feed control as in the cascade and slit die coating methods. If application is to be effected With the roll standing still, then it is well to operate at diminished pressure, at least beyond a specified viscosity and film thickness, so that the coating liquid can penetrate deeply enough into the slit between the roll and the surface to be coated. In Operating with a rotating roll it is not necessary, though sometimes desirable, to lower the pressure, since in this case the casting solution is uniformly applied even at relatively high viscosities.
  • Another advantage of the process according to this invention is that in this case the point of application can be kept free from impurities by simple means, avoiding contamination from the congealing coating liquid.
  • a device for carrying out the present process as disclosed by the invention is c'haracten'zed by the fact that it has as the overflow member fo-r the film-forming liquid preparation a roll which is fixed or can be rotated in arcs or increments, or is continuously rotatable, and past which the film base moves while taking up the film-formng liquid.
  • such a device may advantageously be constructed in such a way that it has a vacuum chamber and/or a cleaning bath covering the bottom of the overfiow roll, together with an adjacent drying zone, below the slit between the overflow roll and the surface of the film to be coated.
  • Such a device is illustrated in the drawing; it is suitable for carrying out the process according to this invention.
  • the coating liquid e.g., an aqueous gelatino-silver halide dispersion
  • the coating liquid is fed to the coating device at position 1. Air bubbles are first removed by the partition. At position 2 the coating liquid reaches the overflow point of roll 3. It then flows in a thin film to application point 4 below position 2, where it comes in contact with the film base carried by support roller 8 and is applied thereto. For uniform application over the entire width Of the fihn, it is important that all points along position 2 shall lie in an exactly horizontal straight line, which is comparatively easy to achieve when a roll is used.
  • the liquid level of the coating solution is approximately even with the tangent 'from the VVertical axis of roll 3.
  • the vat that contains the coating solution is placed close to the roll and part of the surface of the roll can serve as a wall of the vat.
  • the vat can be provided with a suitable jacket for circulation of a heat exchange fluid to control the temperature of the liquid coating composition.
  • the roll can be provided with suitable conduits for circulation of a heat-exchange medium.
  • the roll, vat and related parts can be made of any suitable corrosion-resistant metal, eg., stainless steel, nickel and chromium plated steel, or glass-coated iron or steel.
  • V a any suitable corrosion-resistant metal, eg., stainless steel, nickel and chromium plated steel, or glass-coated iron or steel.
  • a device for coating webs which comprises:
  • a device according to claim 1 having: (4) a cleaning bath below'the roll and adapted to cover its bottom surface. 3.
  • a device according to clairn 1 having: (4) a Cleaning bath below the roll and adapted to cover its bottom surface, and (5) a drying zone adjacent said bath. 4.
  • a device according to claim 3 having: (6) a vacuum'chamber below the slit.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US265644A 1963-03-18 1963-03-18 Apparatus for coating webs Expired - Lifetime US3333568A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE630393D BE630393A (en)) 1963-03-18
US265644A US3333568A (en) 1963-03-18 1963-03-18 Apparatus for coating webs
FR929010A FR1351881A (fr) 1963-03-18 1963-03-22 Procédé et appareil pour revêtir des supports avec des liquides aptes à former des pellicules, en particulier des émulsions photographiques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US265644A US3333568A (en) 1963-03-18 1963-03-18 Apparatus for coating webs

Publications (1)

Publication Number Publication Date
US3333568A true US3333568A (en) 1967-08-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US265644A Expired - Lifetime US3333568A (en) 1963-03-18 1963-03-18 Apparatus for coating webs

Country Status (2)

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US (1) US3333568A (en))
BE (1) BE630393A (en))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926148A (en) * 1971-03-05 1975-12-16 Honsel Karl Heinz Application of adhesive to a moving web
US4287846A (en) * 1980-04-21 1981-09-08 Voplex Corporation Intermittent adhesive applicator
US20110159170A1 (en) * 2009-12-17 2011-06-30 Marsh Jeffrey D Apparatus for and a method of determining condition of hot melt adhesive for binding of a perfect bound book

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2086117A (en) * 1935-12-24 1937-07-06 John Waldron Corp Coating casting machine
US2257373A (en) * 1938-02-02 1941-09-30 K C M Company Method and apparatus for coating sheet material
US2681294A (en) * 1951-08-23 1954-06-15 Eastman Kodak Co Method of coating strip material
US2842092A (en) * 1955-03-02 1958-07-08 John Waldron Corp Reverse roll coating machine with blade support for web

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2086117A (en) * 1935-12-24 1937-07-06 John Waldron Corp Coating casting machine
US2257373A (en) * 1938-02-02 1941-09-30 K C M Company Method and apparatus for coating sheet material
US2681294A (en) * 1951-08-23 1954-06-15 Eastman Kodak Co Method of coating strip material
US2842092A (en) * 1955-03-02 1958-07-08 John Waldron Corp Reverse roll coating machine with blade support for web

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926148A (en) * 1971-03-05 1975-12-16 Honsel Karl Heinz Application of adhesive to a moving web
US4287846A (en) * 1980-04-21 1981-09-08 Voplex Corporation Intermittent adhesive applicator
US20110159170A1 (en) * 2009-12-17 2011-06-30 Marsh Jeffrey D Apparatus for and a method of determining condition of hot melt adhesive for binding of a perfect bound book
US8739730B2 (en) * 2009-12-17 2014-06-03 Jeffrey D. Marsh Apparatus for and a method of determining condition of hot melt adhesive for binding of a perfect bound book

Also Published As

Publication number Publication date
BE630393A (en))

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