Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B25/00—Packaging other articles presenting special problems
  • B65B25/14—Packaging paper or like sheets, envelopes, or newspapers, in flat, folded, or rolled form
  • B65B25/146—Packaging paper or like sheets, envelopes, or newspapers, in flat, folded, or rolled form packaging rolled-up articles
  • B65B25/148—Jumbo paper rolls

Definitions

• the present invention relates to a procedure for braking the motion of the trailing end of the wrapping material used in wrapping a roll, especially a paper roll.
• the wrapping material typically used for the packaging of paper rolls is a fibre-based material consisting of two layers of paper with a moisture barrier between them to improve the moisture resistance of the wrapping.
• the wrapping material is usually moistened to make it easier to handle.
• the moisture content of the material may vary across the width of the wrapping paper e.g. because of the drying of its edges during storage. As a result, the wrapping material gets more tense at the edges than in the middle part, so that it sags in the middle when in a free condition. Therefore, the wrapping material does not settle neatly on a cylindrical roll, and the sagging part leaves ugly creases on the surface of the enwrapped roll.
• the creases are produced at the final stage of the wrapping operation, when the free end of the wrapping is wound around the roll and attached to its surface, usually with glue. Due to the varying roll sizes and the number of wrapping materials simultaneously accessible, the distance between the wrapping station and the point where the wrapping is cut off, and therefore the free travel of the trailing end of the wrapping, is long, which often means that the wrapping gets creased over the entire length of the roll circumference, thus spoiling the appearance of the enwrapped roll and rendering the wrapping liable to be torn at the folds. The problem described above is worst in the case of wrapping materials having a large width, because in such materials the sagging due to uneven tension is largest. In vertical-feed wrapping machines, additional creasing results from the folding or doubling of the free end of the wrapping during the uncontrolled fall after cut-off.
• the wrapping material is elastic, the sagging resulting from uneven tension can be compensated and the folding of the free end during the fall prevented by braking the motion of the wrapping material in the longitudinal direction after the cut-off.
• the invention concerns a procedure for braking the wrapping after cut-off to eliminate the disadvantages resulting from the sagging and uncontrolled fall as described above.
• the track along which the wrapping material proceeds is provided with an essentially transverse zone 3 comprising a braking function applicable to the wrapping.
• the braking is typically effected by a frictional force generated by having the wrapping pressed against the transverse zone by a negative pressure 4 applied to the outer surface of the wrapping.
• this braking zone is located as close as possible, in the direction of motion of the wrapping, to the point where the wrapping touches the roll.
• the braking zone and the negative pressure applied to the wrapping are achieved by using components and technical solutions known in themselves.
• the braking zone is either incorpo ⁇ rated in the wrapping conveyor of a horizontal-feed machine, (fig. 3) or in the lower part of the wrapping feed guide of a vertical-feed system (figs. 1 and 2).
• the principle is that a braking force is applied to the wrapping for as long as possible before it is wound on the roll.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8526674

Family Applications (1)

Country Status (2)

Cited By (1)

Citations (8)

• 1988
  • 1988-06-20 FI FI882932A patent/FI882932A/fi not_active Application Discontinuation
• 1989
  • 1989-06-01 WO PCT/FI1989/000098 patent/WO1989012575A1/en unknown

Patent Citations (8)

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