Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
  • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
  • B05C5/008—Slide-hopper curtain coaters
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
  • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
• • 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
  • G03C2001/7407—Specific angles in extrusion head-slide hopper
• • 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
  • G03C2001/7433—Curtain coating
• • 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
  • G03C2001/747—Lateral edge guiding means for curtain coating
• • 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
  • G03C2001/7474—Impingement conditions curtain onto support

Definitions

• the height of the curtain is preferably in excess of 20 cm, this being the height necessary to give a velocity of about 200 cm per sec at impingement
• the lip is so located that the curtain 32 falling vertically will impinge on the web 14 along a line 35 which is in a plane 36 containing the axis 16.
• the plane 36 is inclined to the vertical plane 38 which includes the axis 16, at an angle (90 - A)° in the range of 30° to 60°, in accordance with the present invention (see Fig. 2).
• the plane 38 includes top dead center 40.
• the roll 12 is rotating clockwise as seen in Figs. 1 and 2 so that the web 14 is moving upwards towards the left hand side of the roll 12 and is moving downwards through the coating point and away from the right hand side
• curtain speed can be taken as:
• the speed at which air entrainment problems cease is generally less than that speed at which the problems started.
• Two gelatin layers were curtain coated simultaneously at a speed of 200 cm sec and with a curtain height of 25 centimeters.
• the top layer had a wet thickness of 60 microns and a viscosity of 35 centipoise, while the bottom layer had a wet thickness of 40 microns and a viscosity of 3 centipoise.
• viscosities considerably higher than 3 centipoise are preferable in practice, this is not always possible in light of, for example, solubility constraints on components, or the rate at which a crosslinking agent added to the composition reacts with gelatin.
• a suitable surfactant was added to the layers to reduce their surface tensions to an estimated 31 m/Nm.
• Curtain height was 25 centimeters.
• the angle A has been considered above, it being described as the angle included between the plane of the sheet of liquid composition just prior to impingement on the support and the tangent to the support at the line of impingement the angle being measured at the side of the sheet facing the uncoated support It has also been pointed out with reference to Figure 2, that (90 - A)° is the angle of inclination of the plane 36 to the plane 38 and has been termed the application angle in those embodiments which include a curtain and a backing roll.

Landscapes

• 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)

Applications Claiming Priority (3)

Publications (2)

Family

ID=22221233

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (10)

Family Cites Families (3)

• 1990
  • 1990-12-20 WO PCT/US1990/007559 patent/WO1992011571A1/en not_active Ceased
• 1991
  • 1991-12-18 DE DE69109695T patent/DE69109695T2/de not_active Expired - Lifetime
  • 1991-12-18 EP EP92904009A patent/EP0563308B1/de not_active Expired - Lifetime
  • 1991-12-18 JP JP4504350A patent/JP2619190B2/ja not_active Expired - Lifetime
  • 1991-12-18 WO PCT/US1991/009527 patent/WO1992011572A1/en not_active Ceased

Non-Patent Citations (1)

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