Plastic and nonmetallic article shaping or treating: processes – Laser ablative shaping or piercing
Patent
1998-04-14
1999-12-28
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Laser ablative shaping or piercing
21912167, 264482, 4251744, B23K 2610
Patent
active
060077565
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a process and a device for producing perforations and/or semi-cuts in printed multilayer composite material by means of laser beams from at least one laser arranged in a laser station.
Multilayer composite material is used in particular for packaging foodstuffs in folding box packages. In this a base layer of cardboard, paperboard or paper and if applicable an aluminium foil layer arranged on top of it is provided on both sides with a layer of polyethylene (PE), in order to provide the subsequent package with the necessary characteristics regarding impermeability, ability to keep out oxygen, protection of the contents from light etc. As such known packages are primarily used for milk, juice or similar; as a rule these packages contain a printed image comprising details concerning the content, manufacturer, advertising or similar.
As a rule, the multilayer composite material is produced as a sheet material; the surface of the material which will later be on the outside of the package is provided with the desired printed images and transported on rollers or directed to further use. Folding box packaging made from this material often comprises weakening lines in the base material and the exterior PE layer, for example to facilitate the insertion of drinking straws into the package or else to enable the intrusion of pouring aids. Such weakening lines which are either made as perforations or as semi-cuts (weakening lines in one or several layer/s of the composite material/s) must therefore be positioned on the composite material depending on the printed image, so as to be "correctly" located in the subsequent package.
From EP 0 357 841 B1, it is already known to lead a sheet of composite material past a laser station, depending on the printed image, with the control of the laser taking place depending on the previously scanned printed image. It is quite evident that this process is extremely expensive because laser treatment has to be carried out while the sheet is moving. To this purpose the movement of the laser beam must not only take into account the actual contour of the notch but also the speed of the sheet.
From GB 21 61 427 A a process by itself for treating thermoplastic cut shapes e.g. PVC is already known, in which folding lines are made in these cut shapes by means of a laser beam applied through a mask, in order to fold a container for packaging purposes from this cut shape. In this it is however necessary to fix the PVC cut shapes onto negative-pressure tables in order to treat the said cut shapes. By contrast, the process according to the invention does not require such construction expenditure.
In addition, the production of cut shapes with smooth-cut edges from sheets of paper, by the application of laser beams, has by itself also been known for a long time (DE 32 22 394 A1). In addition, a laser beam has already been used as a device for longitudinal separation of sheet material on sheet processing machines, as is known from DE 26 14 941 A1by itself.
It is thus the object of the present invention to further improve and develop a device of the type mentioned in the introduction in that the construction effort in particular regarding the control during the production of the perforation and/or the semi-cuts, is minimised without having to renounce exact positioning of the perforations and/or semi-cuts.
In a process of the type mentioned in the introduction, this object is met by the following steps: shapes, depending on the printed image and/or the fold pattern; treatment by means of limit-stop means; and stationary, depending on the limit-stops.
Regarding a device, the task is solved by providing a device for cutting the sheet of multilayer composite material into individual cut shapes, a laser station with at least one laser and respective deflector devices for guiding each laser beam as well as limit-stop means for positioning the individual cut shapes fed to the laser station, in the plane of laser treatment, and providing resp
REFERENCES:
patent: 3790744 (1974-02-01), Bowen
patent: 5688463 (1997-11-01), Robichaud et al.
patent: 5843364 (1998-12-01), Robichaud et al.
Schmidt Holger
Weiteder Hans
SIG Combibloc GmbH
Vargot Mathieu D.
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