EP0000967B1 - Continuous coating of webs having spliced joints - Google Patents

Continuous coating of webs having spliced joints Download PDF

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Publication number
EP0000967B1
EP0000967B1 EP78200128A EP78200128A EP0000967B1 EP 0000967 B1 EP0000967 B1 EP 0000967B1 EP 78200128 A EP78200128 A EP 78200128A EP 78200128 A EP78200128 A EP 78200128A EP 0000967 B1 EP0000967 B1 EP 0000967B1
Authority
EP
European Patent Office
Prior art keywords
web
coating
tape
webs
splicing tape
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
Application number
EP78200128A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0000967A1 (en
Inventor
Joseph Irma De Roeck
Frans Van Steenwinkel
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.)
Agfa Gevaert NV
Original Assignee
Agfa Gevaert NV
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
Application filed by Agfa Gevaert NV filed Critical Agfa Gevaert NV
Publication of EP0000967A1 publication Critical patent/EP0000967A1/en
Application granted granted Critical
Publication of EP0000967B1 publication Critical patent/EP0000967B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
    • 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

  • the present invention relates to a method for the continuous coating of moving webs with a layer of a coating composition, wherein the webs have spliced joints that do not disturb the coating process.
  • a substantially continuous web is coated with a liquid material, such as aqueous solutions or dispersions of hydrophilic colloids, which may then be dried to form the desired product.
  • a liquid material such as aqueous solutions or dispersions of hydrophilic colloids
  • Such manufacturing processes are used in the manufacture of adhesive tapes, magnetic recording tapes and photographic films and papers, among others.
  • the coating process In order to increase the efficiency, and consequently lower the cost, of manufacturing these products, the coating process generally is carried out in a continuous manner. Inasmuch as the web for the coating can only be obtained in finite lengths, a new supply roll of the web must be periodicatiy spliced to the end of the preceding supply roll so that the coating process may go on continuously.
  • the most desirable way of splicing such webs is to utilize a splicing tape width of adjacent ends of two and joining the two adjacent ends of the web together. It has also been found that the application of the splicing tape to the front side of the web, that is the side that is intended for receiving a coating, provides fewer coating flaws than does the application of the splicing tape to the back side of the web. However, even though the application of the splicing tape to the front side of the web results in fewer coating problems than do other methods of splicing, streaks and other defects have still been found in the coating downstream from the splicing tape.
  • the spliced section of the continuous web is cut from the finished product and is scraped so that the defects in the coating occurring at the splice joint are not found in the final product.
  • the splice joint may affect substantial lengths of the coated web following the splice. In many products, it is possible to cut out the affected portion of the web without substantially affecting the usability of adjacent portions. However, in many products this is not possible, and the entire web containing such defects must be scrapped.
  • the elimination of the splice-imposed defects must not in any way result in other, potentially less desirable defects in the coated product. Additionally, 'the method of eliminating the splice-imposed defects must be readily accomplished without affecting the production rates possible in modern high-speed coating machines.
  • Japanese preliminary publication 51-48067 (Yamanchi Rubber Kog KK) Published 24 April 1976, discloses the concept of splicing webs using tape that runs from one side of a first web to the opposite side of the next web.
  • the invention aims in particular to provide a method for the continuous coating of moving webs that are to be coated by means of a slide hopper or any other coating device that is very closely spaced from the web, and wherein the speed at which a web splice may be passed through the coater before coating defects of the kind re- .ferred to start to occur, may be higher than the usual speeds at which suchlike defects occur.
  • “usual speeds” we consider in the present case speeds ranging from 80 to 100 meters per minute (m.min- 1 ).
  • a method for the continuous coating of a moving web with at least one layer of a coating composition wherein a spliced joint between two successive webs is formed by a splicing tape that forms a flexible transition between the trailing web end, i.e. the rearmost end according to the direction of movement of the web, and the adjacent leading web end, i.e. the foremcst end according to the direction of movement of the web, is characterized thereby that both web ends are separated from each other over a distance of at least ten times the web thickness, and that the splicing tape is fixed to the trailing end of the old web at the front side of said web, i.e.
  • the side that is intended to receive a coating and to the leading end of the new web at the back side of the web, i.e. the web side that is opposite to the front side, thereby to provide only step-up discontinuities at the front side of the web splice that passes past the coating head in the coating station.
  • front side of the webs stands for the side of the web that is intended to receive a coating
  • back side of the webs stands for the opposite web side, as mentioned already hereinbefore, it should be understood that said terms have a relative meaning only, and a web which has been coated on one side in accordance with the method according to the invention, may as well be unwound again from the roll onto which it has firstly been wound, in order to be passed in reversed condition through another splicing and associated coating station or stations to receive a coating or coatings at its opposite side.
  • This step is notably practised in the manufacture of, for instance, common radiographic film which is provided with a radiation-sensitive and an anti-stress layer on both its sides.
  • leading and trailing have been used to designate physical position or location and are used in reference to the direction of travel of the webs.
  • the splicing tape has to pass through the opening between the two web ends from one side of the webs to the opposite side, it will be understood that some minimum distance between the web ends is desirable in order to give the leading end of the new web the opportunity to be situated in the same position, or to follow the same path, as the trailing end of the receding web.
  • a web end separation over a distance of at least ten times the web thickness is therefore a practical minimum.
  • the splicing tape may be formed from two standard self-adhesive tapes that are adhered to each other with the adhesive layers in contact with each other and while in partly overlapping relationship, thereby to present two adhesive bands that are situated at opposite edges and at opposite sides of the composite splicing tape.
  • Such adherence of both tapes to each other to have rolls of tape with the described configuration may be carried out beforehand, for instance by the manufacturer of the tape. It will be understood, however, that the mutual taping together of the splicing tapes may also occur upon their unwinding in a tape dispenser that is mounted on the carriage that cuts and tapes the webs together as it moves transversely across the webs- in an automatic web-spiicer.
  • two splicing tapes may be separately unwound over a length corresponding with or slightly exceeding the width of the webs, a portion of one tape pressed onto one side of one web and the other tape pressed onto the opposite side of the other web, at a similar portion of the other side, and then the tape portions are pressed onto each other.
  • the splicing tape may also consist of one support that is provided with two adhesive bands that are situated at opposite margins and opposite sides of such support.
  • a web 10 is drawn over a web-supporting roller 11 through a coating station that in the present example has been illustrated as a slide hopper or bead coater.
  • a coater may comprise a coating head 12 with a manifold 13 through which the coating composition is pumped outwardly onto a slide surface 14 from which it flows downwardly as a layer of uniform thickness.
  • Contact of the layer with the web occurs through a so-called bead of coating composition which may be stabilised by maintaining at the lower side of the lip 15 of the coater an air pressure that is lower than the air pressure at the upper side of the lip, said upper pressure being usually the ambient air pressure.
  • the spacing between the front side of the web and the front side of the lip 15 usually ranges between 0.2 and 0.3 mm.
  • the web 10 may be considered in the present embodiment as the new web, since it is spliced by a tape splice 16 to the web 17 which is the old web that has already passed through the coating station.
  • the tape splice may have different forms that are illustrated in figs. 2 and 3.
  • the splice joint 16 shown in fig. 2 is formed by two tapes 18 and 19 and each have a self-adhesive layer on one side, and that have been adhered to each other in slightly staggered relation considered according to the width of the tapes, with the self-adhesive layers in contact with each other.
  • the remaining free band of the self-adhesive layer of the tape 18 is adhered to the front side of the trailing end of the web 17, whereas the remaining free band of the self-adhesive layer of the tape 19 is adhered to the back side of the leading end of the web 10.
  • the adhesive zone of a tape that is in contact with a web should be sufficiently great to establish a bond with the web that withstands the usual longitudinal tensions in the web during its winding and unwinding, the corrections of the lateral position of its path of travel, acclerations in web accumulation.
  • the tapes were provided at their rearside opposite the adhesive with a subbing layer of the type applied to the webs thereby to not disturb the coating of an aqueous gelatinous silver halide layer.
  • the splice joint 16 shown in fig. 3 is made by means of a single tape 24 that is provided at opposite ends and opposite sides with bands 25 and 26 of a self-adhesive material. Supply of such a tape in the form of a roll of tape does not offer problems since the thickness of the tape at both its adhesive zones is equal. It may be seen that, similarly as in the embodiment of fig. 2, only step-up edges are formed by the tape splice at the front side of the webs (the upper web side in the drawings of figs. 2 and 3).
  • the broken line 27 in fig. 3 shows that the leading edge of the new web 10 may occasionally be bevelled or feathered.
  • This configuration may be desirable at elevated coating speeds since in such case the passage of the unbevelled extremity of the new web 10 may disturb the coating bead in such a way that the thickness of the coated layer is briefly reduced and immediately thereafter correspondingly increased.
  • defect may be limited to a web length of some centimeters only, the consequence may be that the locally thicker layer cannot be dried by an existing drying installation so that in that way an undesirable limitation might be imposed upon the coating speed.

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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)
  • Coating Apparatus (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
EP78200128A 1977-08-23 1978-08-03 Continuous coating of webs having spliced joints Expired EP0000967B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3531977 1977-08-23
GB3531977 1977-08-23

Publications (2)

Publication Number Publication Date
EP0000967A1 EP0000967A1 (en) 1979-03-07
EP0000967B1 true EP0000967B1 (en) 1981-09-30

Family

ID=10376380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78200128A Expired EP0000967B1 (en) 1977-08-23 1978-08-03 Continuous coating of webs having spliced joints

Country Status (5)

Country Link
US (1) US4235655A (enrdf_load_stackoverflow)
EP (1) EP0000967B1 (enrdf_load_stackoverflow)
JP (1) JPS5434343A (enrdf_load_stackoverflow)
DE (1) DE2861228D1 (enrdf_load_stackoverflow)
FR (1) FR2400968A1 (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE34072E (en) * 1984-12-28 1992-09-22 Honda Giken Kogyo Kabushiki Kaisha Motorcycle
FR2648080B1 (fr) * 1989-06-08 1991-10-11 Saint Gobain Vitrage Procede et dispositif de fabrication d'une feuille continue de matiere plastique par coulee a l'etat liquide sur un support mobile comprenant des plaques de verre juxtaposees
DE19703211A1 (de) * 1997-01-29 1998-07-30 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zum direkten oder indirekten einseitigen oder zweiseitigen Auftragen eines flüssigen oder pastösen Auftragsmediums auf eine laufende Materialbahn
JP4501243B2 (ja) * 2000-07-24 2010-07-14 ソニー株式会社 テレビジョン受像機およびプログラム実行方法
US6863945B2 (en) * 2001-12-31 2005-03-08 Kimberly-Clark Worldwide, Inc. Usable splice for a stabilized absorbent
AUPS306802A0 (en) * 2002-06-20 2002-07-11 Wmc Resources Ltd A data acquisition unit, system and method for geophysical data
CN107444951B (zh) * 2017-07-24 2019-03-05 宁夏海力电子有限公司 化成箔接箔方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531362A (en) * 1967-10-30 1970-09-29 Eastman Kodak Co Spliced joint in coated web material and method of forming said joint
GB1243663A (en) * 1968-02-02 1971-08-25 Kodak Ltd Manufacture of coated layers
JPS5247771B2 (enrdf_load_stackoverflow) * 1973-08-22 1977-12-05
JPS5049338A (enrdf_load_stackoverflow) * 1973-09-03 1975-05-02

Also Published As

Publication number Publication date
US4235655A (en) 1980-11-25
FR2400968B1 (enrdf_load_stackoverflow) 1981-07-10
JPS6227865B2 (enrdf_load_stackoverflow) 1987-06-17
DE2861228D1 (en) 1981-12-10
FR2400968A1 (fr) 1979-03-23
EP0000967A1 (en) 1979-03-07
JPS5434343A (en) 1979-03-13

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