US3785284A - Screen printing machine - Google Patents

Screen printing machine Download PDF

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Publication number
US3785284A
US3785284A US00253764A US3785284DA US3785284A US 3785284 A US3785284 A US 3785284A US 00253764 A US00253764 A US 00253764A US 3785284D A US3785284D A US 3785284DA US 3785284 A US3785284 A US 3785284A
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US
United States
Prior art keywords
web
belt
roller
track
printing
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
US00253764A
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English (en)
Inventor
J Vertegaal
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.)
Stork Brabant BV
Original Assignee
Stork Brabant BV
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 Stork Brabant BV filed Critical Stork Brabant BV
Application granted granted Critical
Publication of US3785284A publication Critical patent/US3785284A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/16—Printing tables
    • B41F15/18—Supports for workpieces
    • B41F15/24—Supports for workpieces for webs

Definitions

  • a screen printing machine comprising a plurality of [30] Foreign Apphcatlon Priority Data cylindrical screens capable of printing a travelling web Jan. 28, 1969 Netherlands 6901386 which is temporarily affixed to a pp g belt7 Said 1 machine comprising means for discharging said web [52] US. Cl 101/118, 101/232, 226/170 immediately beyond the last screen under an acute [51] Int. Cl B411 13/06, B65h 17/34 angle with Said hem [58] Field of Search 101/118, 119,120,
  • My invention relates to a screen printing machine consisting of at least one cylindrical stencil and a driven endless belt on which the web to be printed can be temporarily affixed e.g., by means of glue for support and guiding in the printing track. With not so closely woven fabrics symptoms may occur which can give rise to faults as will be explained hereinafter.
  • the web After the last color has been pressed through the cylindrical stencil the web is still taken along over a certain distance with the belt (the so called blanket) before it is pulled off. At the slightest irregularity of the glue film, the web is loosened along a sharply broken line. When the web is separated from the belt along a horizontal extension of the printing track, an irregular loosening of the web results. In closely printed patterns this non-uniform loosening appears as an irregularity.
  • FIG. 1 shows a diagrammatical side elevational view of a part of a screen printing machine.
  • FIGS. 2 and 3 show in plan view the difficulties experienced on pulling off the web of fabric when the invention is not applied.
  • the supporting belt 2 is guided over two sprockets 4 one of which is depicted in the drawing.
  • a number of supporting rollers 5 corresponding to the number of stencils 1 are situated under the supporting belt 2.
  • the supporting roller 5 has a diameter which is considerably smaller than the diameter of the cylindrical printing stencil 1. This reduced diameter of the supporting roller 5 greatly increases the nip angle between the web 3 and the belt 2. This pronounced increase of the nip angle contributes significantly to the sharp and precise separation of the web 3 from the belt 2 in order to obtain the straight line perpendicular to the direction of travel of the belt.
  • the provision according to the invention consists, in the embodiment according to FIG. 1, in a particular position of the sprocket 4 situated near the location at which the web is discharged, this sprocket being disposed at a level lower than that of the printing track A. In this manner there is a straight strike-off line or loosening-area, whereby two difficulties so far encountered are avoided.
  • the first drawback has been discussed hereinbefore and relates to the irregularity in tightly crammed patterns.
  • a second drawback which is eliminated lies in the formation of folds which may occur due to the swelling up of the fibres of closely woven fabrics under the influence of moisture absorption from the printing paste. Since the back ground is printed as last color the symptoms of swelling up and thereby getting loose from the supporting belt will especially occur in the area past the last stencil. Due to the provision according to the invention this is no longer possible because the web after having passed by this stencil is then immediately pulled off. The cause of this formation of folds is depicted in the FIGS. 3 and 3A.
  • the web 3 after having been detached from the belt 2 is transferred without change of direction to a usual floating dryer 6.
  • the angle between the web 3 and the belt 2 after passing by the printing area of the last stencil 1 amounts to at least 5.
  • FIGS. 2 and 3 it is illustrated that in the conventional process the glue loosens from the web in an irregular manner such that there are parts from the web in which the contact between the color face printed upon the web and the glue against the lower side of the web is different from other parts of the web. This leads unavoidably to variations in color which may not be readily apparent to the layman but which are easily recognizable by persons skilled in the art. These color variations have the effect of significantly lowering the prices of the final printed product.
  • the use of a film of glue on the lower side of the material to be printed has a specific influence upon the drying characteristics ofthe ink printed upon the upper side of the material.
  • lt is not the adherance of the web upon the supporting belt which is important but it is the use of a glue film which has a particular consequence.
  • This invention is not directed to the glueing or adhering of the web upon the belt but the manner of separating the web from the belt after the last printing operation so that there is no irregularity in the time lapse during which the web is in contact with the film of glue.
  • a screen printing machine of the endless belt support type consisting of at least one cylindrical stencil and first and second rollers, a driven endless adhesive belt on which the web to be printed is temporarily and uniformily adhered by said adhesive for support and guide in a printed track, a nip formed at the intersection of one cylindrical stencil and said first roller, said first roller having a substantially smaller diameter than said one cylindrical stencil, said second roller being located on the exit side from the nip and beyond and below said first roller to form an acute angle between said printing track and said endless belt supported by said rollers for separating the adhered web from the belt along a straight line perpendicular to the direction of travel of the belt and web immediately after the web has passed under the one cylindrical stencil of the printing track and after emerging from the nip.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
US00253764A 1969-01-28 1972-05-16 Screen printing machine Expired - Lifetime US3785284A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6901386A NL6901386A (enrdf_load_html_response) 1969-01-28 1969-01-28

Publications (1)

Publication Number Publication Date
US3785284A true US3785284A (en) 1974-01-15

Family

ID=19805999

Family Applications (1)

Application Number Title Priority Date Filing Date
US00253764A Expired - Lifetime US3785284A (en) 1969-01-28 1972-05-16 Screen printing machine

Country Status (6)

Country Link
US (1) US3785284A (enrdf_load_html_response)
AT (1) AT310700B (enrdf_load_html_response)
CH (1) CH493334A (enrdf_load_html_response)
DE (1) DE2000481A1 (enrdf_load_html_response)
FR (1) FR2029520A1 (enrdf_load_html_response)
NL (1) NL6901386A (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4224870A (en) * 1977-03-12 1980-09-30 Budai Mikulas Screen printing machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2139164A (en) * 1931-11-16 1938-12-06 Theodore E Knowlton Method and apparatus for preventing slipping in printing
US2522224A (en) * 1946-12-05 1950-09-12 Jr John H B Hedinger Label printing and dispensing machine
US3102469A (en) * 1959-07-20 1963-09-03 Maurice H Sherman Screen printing apparatus
US3198109A (en) * 1961-05-02 1965-08-03 Grace W R & Co Printing of container closure gaskets

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2139164A (en) * 1931-11-16 1938-12-06 Theodore E Knowlton Method and apparatus for preventing slipping in printing
US2522224A (en) * 1946-12-05 1950-09-12 Jr John H B Hedinger Label printing and dispensing machine
US3102469A (en) * 1959-07-20 1963-09-03 Maurice H Sherman Screen printing apparatus
US3198109A (en) * 1961-05-02 1965-08-03 Grace W R & Co Printing of container closure gaskets

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4224870A (en) * 1977-03-12 1980-09-30 Budai Mikulas Screen printing machine

Also Published As

Publication number Publication date
NL6901386A (enrdf_load_html_response) 1970-07-30
AT310700B (de) 1973-10-10
FR2029520A1 (enrdf_load_html_response) 1970-10-23
CH493334A (de) 1970-07-15
DE2000481A1 (de) 1970-07-30

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