Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
  • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
  • B44C1/10—Applying flat materials, e.g. leaflets, pieces of fabrics
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
  • B26D3/12—Slitting marginal portions of the work, i.e. forming cuts, without removal of material, at an angle, e.g. a right angle, to the edge of the work
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet

Definitions

• the present invention relates to a treatment method for keeping a thin film flat, more particularly although not exclusively, a film of water-soluble material used for covering articles by immersion.
• the transfer sheet When placed on the top surface of the liquid, the transfer sheet tends to change size during softening. So that the pattern to be transferred does not undergo parasitic deformation causing defects on the transferred coating, it is essential that the change in size is as regular as possible.
• the edges of the film forming the transfer sheet tend to roll along the edges. that is to say that the film tends to wind on itself locally, which causes stresses in the film generating a parasitic deformation of the decorative pattern, that is to say a deformation not provided for in advance. Similar rolling phenomena can be observed due to the stresses appearing in a thin plastic film when the latter is subjected to tensile forces so that the handling of the film is affected.
• An object of the invention is to provide a treatment for keeping a thin film flat.
• a method is proposed comprising the step of delimiting on the film separate blocking segments extending along the edges of the film.
• the blocking segments are produced by cutting the edge of the film according to a non-rectilinear contour.
• the blocking segments are produced by cutting the film along segments spaced from one another.
• the lips of the segments thus cut then tend to deform slightly in the manner of a buttonhole so that this slight deformation creates a component of transverse force at the edge of the film and blocks rolling of the edge of the film.
• the blocking segments are produced by applying a deposit of material on the film.
• the segments then cause a very slight local stiffening of the film which prevents rolling of the film along the edge.
• the deposit of material is preferably arranged on the side of the film which is in contact with the liquid, so that the deposit of material locally delays the softening of the film, which further improves the flat holding thereof.
• FIG. 1 is a partial top view of a film comprising two types of blocking segment
• FIG. 2 is a partial perspective view of a device making it possible to cut a thin film
• FIG. 3 is a partial view of a film on which blocking segments have been produced by means of a material deposition.
• the edge of the film 1 is cut along a broken zigzag line delimiting fringes 9 in the form of triangles whose base 2 illustrated by dashes connecting two reversal points, forms blocking segments as will be explained below.
• the fringes 9 are in the form of equilateral triangles.
• Cutting along a broken line can be carried out using a shaped heating wire or using a cutter. Cutting can also be performed using a laser associated with an oscillating mirror and by scrolling the edge of the film in the field of laser radiation.
• the zigzag cut can also be carried out by means of a very thin water jet projected onto the film using an oscillating nozzle.
• the sides of the fringes 9 preferably have a length of between 5 mm and 15 mm, and preferably 10 mm.
• the fringes 9 tend to roll but as soon as the ends of the winding reach points of inversion of the zigzag outline, the rolling is stopped so that the bases of the fringes 9 form separate blocking segments which prevent further winding of the edge.
• FIG. 1 also illustrates a second embodiment of the method according to the invention - consisting in cutting from the film two series of blocking segments 3 offset laterally with respect to each other, the blocking segments d one series being alternated with respect to the blocking segments of the other series, and the blocking segments 3 of a series being spaced from each other by a distance close to the length of the blocking segments 3.
• the locking segments 3 are preferably produced by means of the device illustrated in FIG. 2.
• the device comprises a cylindrical anvil 4 on which a thumb wheel 5 is kept pressed.
• the wheel 5 comprises two series of cutting sectors 6 projecting from the surface of the wheel 5. Teeth 7 extend between the cutting sectors 6.
• the cutting sectors 6 extend alternately in two offset circles, c that is to say that in an axial direction of the dial, opposite a cutting sector 6 of one of the circles, the other circle has drive teeth 7.
• the film 1 is pinched between the anvil 4 and the cutting wheel 5 so that the rotational drive of the anvil 4 causes the film 1 to be drawn on the one hand and the film 1 to be cut adjacent to its longitudinal edge along alternate slots 3 as illustrated in Figure 1.
• the blocking segments 3 preferably have a length of between 10 mm and 30 mm, and preferably 20 mm and the two series of segments are spaced apart. one from the other by a distance between 5 mm and 20 mm, more particularly 10 mm.
• FIG. 3 illustrates a third mode of implementation according to which blocking segments 8 have been produced by means of a stiffening material such as a varnish deposited on the film by any suitable means such as a brush, or a means of printing such as serigraphy or heliography. Satisfactory flat retention of a water-soluble film 40 ⁇ m thick was obtained by producing rectangular blocking segments arranged perpendicular to the edge of the film and having a length of between 3 mm and 10 mm, and preferably 5 mm, and a width between 2 mm and 5 mm, preferably 3 mm.
• the locking segments are spaced in a longitudinal direction of the film by a distance of between 5 cm and 10 cm, preferably 8 cm.
• the cutting of the edge of the film according to a line broken in a zigzag can be replaced by a cut along a scallop line or any other cut delimiting blocking segments by an inversion of direction between two points of a non-rectilinear contour, including a curvilinear contour such as a contour sinusoidal.
• this can be carried out with an insoluble material, such as the varnish mentioned above, or with a soluble material whose consistency and / or thickness locally slows the dissolution of the film.
• the length and arrangement of the blocking segments are adapted to the solubility of the film and to its thickness.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Photovoltaic Devices (AREA)

Applications Claiming Priority (3)

Publications (1)

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ID=32039731

Family Applications (1)

Country Status (4)

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Family Cites Families (6)

• 2002
  • 2002-10-15 FR FR0212779A patent/FR2845677A1/fr not_active Withdrawn
• 2003
  • 2003-10-10 WO PCT/FR2003/002992 patent/WO2004035324A2/fr not_active Ceased
  • 2003-10-10 EP EP03773821A patent/EP1554126A2/de not_active Withdrawn
  • 2003-10-10 AU AU2003282201A patent/AU2003282201A1/en not_active Abandoned

Non-Patent Citations (1)

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