Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
  • B31F1/08—Creasing
  • B31F1/10—Creasing by rotary tools
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
  • B31B50/25—Surface scoring
  • B31B50/254—Surface scoring using tools mounted on belts or chains

Definitions

• the invention relates to a device for scoring corrugated cardboard in processing machines according to the preamble of patent claim 1.
• creases are automatically produced using creasing knives or creasing rings in the direction of material travel.
• the creases which will later be responsible for folding the blank, are particularly critical and, according to the current state of the art, produce uncontrolled gap widths in the finished folding box. This results solely from the not perfect grooving.
• the creasing is carried out in the direction of the corrugated cardboard and thus along the corrugations of the cardboard, and this means that there are always different conditions from corrugation to corrugation tip. Since the folding takes place via belts, if the shaft is not 100% shaped, there is a somewhat backward folding, which is referred to as "fish-tailing".
• the degree of creasing is also influenced by the paper quality used. Light or recycled qualities only allow a lower level because these types of paper become easily cracked and thus reduce the resilience of the folding box.
• DE 31 38 454 C2 discloses a device and a method for embossing grooves in corrugated cardboard for folding and adhering to the cardboard dimensions for corrugated cardboard creasing machines.
• the corrugated cardboard or the cardboard to be grooved is passed between two rollers and thereby grooved.
• the distance between the two rollers is set beforehand so that the correct pressure is given to the material to be creased.
• a method and a device for producing blanks for folding boxes are known, the blank being guided in succession with the aid of a transport device through an insertion station, an embossing station, a cooling station, a punching station and a removal station.
• a machine is referred to as an inline machine since several operations are carried out in one and the same machine.
• the stamping station has a hydraulically or mechanically driven stamping press with a fixed lower plate and a vertically movable upper pressure plate. Both plates have heating plates whose temperature can be set independently of one another. Since the heating plates are attached to the embossing tool, the embossing or creasing is always carried out simultaneously with the heating and thus in stationary operation.
• the machine must therefore work intermittently, ie the transport device must first guide a blank under the embossing tool, then stop to close the embossing tool and keep it closed until the heating plates have heated sufficiently. Then the embossing force is increased to emboss the embossing lines. The embossing tool then opens and the transport device which starts again conveys the cut sheet thus grooved to the cooling station.
• a disadvantage of this known device and the method that can be carried out with it is that the transport device has to start and brake again and again, which requires energy-intensive acceleration and braking of not inconsiderable masses. This is subject to natural speed limits.
• DE 195 38512 A1 discloses a method and a device for embossing crease lines in corrugated cardboard for better folding and compliance with the box dimensions for inline machines.
• the part of the corrugated cardboard intended for the creasing is heated with the aid of a heated table immediately before the creasing or during the creasing itself.
• the object of the invention is to provide a device with which a more precise corrugation of corrugated cardboard than in the prior art for the subsequent production of folding boxes can be achieved.
• a device with the features of claim 1 is used to achieve this object.
• the corrugated cardboard is thus transported with a rotating ring, the actual creasing is characterized by a number of straight lines which varies depending on the outer diameter of the ring.
• the invention is explained in more detail below with the aid of a drawing.
• FIG 1 shows schematically an embodiment
• FIG. 2 shows a section A from the creasing body from FIG. 1.
• Figure 1 shows schematically an upper and lower transport body 1 and 2 in a pressure folding and gluing machine for corrugated cardboard 3, which is also generally referred to as an in-line machine. These transport bodies 1, 2 are necessary for the clocked feed within the machine.
• the transport bodies 1 and 2 are mounted in a known manner on driven shafts in an in-line machine.
• One of these transport bodies 1 or 2 depending on the machine design for top or bottom pressure, is provided on its circumference 4 with a varying number of straight flat pieces 10, 10 'and 10 ", which are evenly distributed over the circumference 4 and give the transport body 1 the appearance of a multi-key or polygon in the view.
• These straight flat pieces 10, 10 ', 10 " are between 5 mm and 25 mm long, depending on the outer diameter of the transport body 1.
• the combined creasing and transport body 1 provided with these straight flat pieces 10, 10 ', 10 " is usually made of steel or cast iron and presses the part of the corrugated cardboard 3 to be creased against the outer circumference of the lower transport body 2, referred to as the counter body, which either has a steel or polyurethane tread.
• the combined creasing and transport body 1 accordingly has a polygonal creasing ring 11 which protrudes about 1 to 4 mm over the circumference 4 of its circular transport body 1 and has a width of 0.5 to 4 mm, the edges being rounded.
• the outer contour over the largest circumference 4 of the combined creasing and transporting body 1 is thus that of a regular polygon with, for example, 70 corners, which cannot be seen from FIG. 1, since this only shows the creasing ring schematically.
• FIG. 2 shows an enlarged detail A from FIG. 1, in which the straight course of the flat pieces 10, 10 ', 10 "can be better recognized.
• the circumference 4 of the transport body 1 thus extends as an arc, while the outer contour of the flat pieces 10, 10', 10 "between points B and C as well as straight to the right and left of it.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Making Paper Articles (AREA)
• Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7885657

Family Applications (1)

Country Status (6)

Families Citing this family (8)

Family Cites Families (8)

• 1998
  • 1998-10-15 DE DE19849282A patent/DE19849282C1/de not_active Expired - Fee Related
• 1999
  • 1999-10-13 US US09/701,691 patent/US6537189B1/en not_active Expired - Lifetime
  • 1999-10-13 EP EP99953815A patent/EP1121243B1/fr not_active Expired - Lifetime
  • 1999-10-13 WO PCT/EP1999/007712 patent/WO2000021741A1/fr active IP Right Grant
  • 1999-10-13 DE DE59902071T patent/DE59902071D1/de not_active Expired - Lifetime
  • 1999-10-13 CA CA002336912A patent/CA2336912C/fr not_active Expired - Fee Related
  • 1999-10-13 AT AT99953815T patent/ATE220616T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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