METHOD AND DEVICE IN CONNECTION WITH PAPER-LINING OF SHEETS

Abstract: The present invention relates to a method in connection with paper-lining, characterised in that a sheet is paper-lined with a first layer on one side thereof, is turned to position the underneath side upwards, and that the uncoated side is coated with a second layer, whereby the edge of the sheet and the first layer, hereinafter denoted register edge, which is used in the orientation of these in the first paper-lining, constitutes the register edge for the second paper-lining. The invention also relates to a device characterised in that it comprises a turning means which is arranged after the discharge from a first paper-lining machine, as seen in its feeding direction, capable of turning a paper-lined sheet so that its top side is positioned downwards, a feeding means, arranged after the turning means, capable of feeding the turned sheet onwards in a feeding direction and into a second paper-lining machine, which is capable of paper-lining the sheet on the uncoated side, whereby the edge of the sheet and the first layer, hereinafter denoted register edge, which is used in the orientation of these in the first paper-lining, constitutes the register edge for the second paper-lining.

Description: METHOD AND DEVICE IN CONNECTION WITH PAPER-LINING OF SHEETS TECHNICAL FIELD The present invention relates to a method in connection with paper-lining of sheets, and a device for its accomplishment. BACKGROUND OF THE INVENTION The present invention relates to devices in connection with the paper-lining of flat ob- jects. In paper-lining, two sheets, often one cardboard or corrugated board sheet and one printed paper sheet, one of the sheets being coated with adhesive, are fed to a joining point and are joined together by aid of rolls or rollers. If the other side of the cardboard or the corrugated board also is to be lined with a paper sheet, which is often a requirement for signboards which are to be placed in a shop to provide advertising on both sides thereof, and to avoid bending of the sheets due to the sheets only being laminated on one side, it is conventional to collect the paper-lined sheets, turn them, and to feed them into the paper-lining machine for paper-lining them on the other side. Usually, this operation is performed manually, which is often burden- some and inconvenient. Moreover, the second paper-lining should preferably be made relatively soon after the first one, in order for the sheets not to bend, which otherwise renders the second paper-lining more difficult. Single paper-lining too often requires a great deal of manual labour. To avoid bending of the laminated sheets, they are usually bundled, alternately turned right side up and right side down, in stacks. This operation too is made manually. SHORT ACCOUNT OF THE INVENTION The object of the present invention is to eliminate the above problems in connection with paper-lining. According to one aspect of the invention, this is achieved by a method which is characterised in that a sheet is paper-lined with a first layer on one side thereof, is turned to position the underneath side upwards, and that the uncoated side is coated with a second layer, whereby the edge of the sheet and the first layer, hereinafter denoted register edge, which is used in the orientation of these in the first paper-lining, constitutes the register edge for the second paper-lining. According to another aspect of the invention, this is achieved by a device which is characterised in that it comprises a turning means which is arranged after the discharge from a first paper-lining machine, as seen in its feeding direction, which turning means is capable of turning a paper-lined sheet so that its top side is positioned downwards, a feeding means, arranged after the turning means, capable of feeding the turned sheet onwards in a feeding direction and into a second paper-lining machine, which is capable of paper-lining the sheet on the uncoated side, whereby the edge of the sheet and the first layer, hereinafter denoted register edge, which is used in the orientation of these in the first paper-lining, constitutes the register edge for the second paper-lining. According to a yet an aspect of the invention, this is achieved by a device which is characterised in that it comprises a turning means which is arranged after the discharge from a first paper-lining machine, as seen in its feeding direction, which turning means is capable of turning at least one paper-lined sheet so that its top side is positioned down- wards, a first feeding means, arranged after the turning means, capable of feeding the turned sheet onwards in a feeding direction, a second feeding means, arranged before the turning means, capable of feeding at least one unturned sheet onwards in a feeding direction, and a stacking means, capable of receiving and stacking the turned and unturned sheets. Several advantages are obtained with the above mentioned method and device. Double paper-lining, i.e. coating on both sides of a carrier sheet, may be obtained in one operation. The sheets are, moreover, arranged so that the same edge, the register edge, at which the sheets are oriented in the paper-lining, are used for both the paper-linings. Thanks to the turning means and the feeding means in connection to this, it is made possible to automatically stack bundles of sheets which are alternately turned and unturned. The present invention provides an excellent flexibility in paper-lining, and enables avoiding of the burdensome and time consuming manual handling of sheets, in connection with paper-lining. Additional aspects of and advantages with the present invention will be apparent from the detailed description of a preferred embodiment, and from the enclosed claims. SHORT DESCRIPTION OF THE FIGURES In the following description of a preferred embodiment, there will be referred to the enclosed figures, of which Fig. 1 is showing a side view of a paper-lining machine and a turning means which is part of the present invention, and Fig. 2 schematically is showing a view of the top side of the device in Fig. 1. DESCRIPTION OF A PREFERRED EMBODIMENT In Fig. 1 and 2, a paper-lining machine is generally referred to with the reference nu- meral 12. In the paper-lining machine, a bottom, adhesive coated, carrier layer is joined with a top coat layer, most often with some type of printing. The layers are oriented in relation to each other, registered, along their front edges, seen in the feeding direction of the machine, to obtain a good fit between the layers. After the joining, the sheet is fed out from the sheet paper-lining machine. After the paper-lining machine, seen in the feeding direction, a turning means 10 is arranged. The turning means comprises a shaft 14, which is rotatably journalled in bearings in a stand 16, and oriented perpendicularly to the feeding direction, Ml. The shaft is rotated by aid of a suitable motor 18. A number of sticks 20 are arranged on the shaft, both parallel to the shaft and with a certain angle α in relation to each other, in the shown embodiment 8 sticks which are distributed about the circumference of the shaft with a partition of 45°. The motor is equipped with a suitable control, to stop the shaft when a number of sticks are essentially horizontal and directed towards the discharge of the paper-lining machine. When one sheet has been discharged from the paper-lining machine and is lying on the sticks, the motor receives a signal and turns the shaft the angle α, until the next row of sticks are positioned. A feeding means 22 is arranged on the other side of the turning means, which feeding means transports the sheet, when the shaft has been rotated so that a sheet is positioned on it, in a direction M2 which is parallel to the shaft, i.e. perpendicular to the discharge direction Ml from the paper-liner. The feeding means 22 is provided with a number of shafts 23, with a common drive motor. A number of rolls 25 are fixedly attached to the shafts. The shafts are arranged so that the sticks 20 can move freely between them at the rotation of the shaft 14. According to one embodiment, the sheet is fed via a second feeding means 24, arranged downstream, in the feeding direction M2. The sheet is thereafter fed onwards into the lower hopper of a second paper-lining machine 26, the register edge of the first paper- lining ending up in the front in the feeding direction M3 for the second paper-lining machine. The second paper-lining machine 26 is of the same type as the first one, and is therefore only schematically shown in Fig. 2. From the lower hopper, the sheet is fed into the machine, is coated with adhesive and is paper-lined with a second top coat layer. Due to the sheet having been oriented at the paper-lining as is described above, the same register edge is used in the second paper-lining machine 26, which is impor- tant in double paper-lining. Accordingly, a double paper-lining is achieved in a continuous operation. According to a second embodiment, the second feeding unit 24 is replaced with a stacking unit, to which the sheets are being fed from the turning means, for further treatment. In connection with this, a feeding means 28, which may be of the same type as the feeding means 22, may be arranged in front of the turning means 10, which via an additional feeding means 30 feeds unturned sheets to the stacking unit. This may be the case if it is desired to stack paper-lined sheets which are alternately turned and unturned. This way of stacking is often used for single paper-lined sheets, where it is de- sired to avoid bending of the sheets when they are drying. In this case it may also be conceived to feed a number of sheets, for example 10 sheets, into the turning means before it rotates, to feed 10 sheets which continue with the feeding means in front of the turning means, to feed an additional 10 sheets into the turning machine, and so on. In this way, there is provided bundles of 10 turned sheets, 10 unturned sheets, and so on. It is to be understood that the invention is not limited to the embodiment described above and shown in the figures, but may be modified within the scope of the enclosed claims.

Claims: CLAIMS 1. Method in connection with paper-lining, characterised in that a sheet is paper-lined with a first layer on one side thereof, is turned to position the underneath side upwards, and that the uncoated side is coated with a second layer, whereby the edge of the sheet and the first layer, hereinafter denoted register edge, which is used in the orientation of these in the first paper-lining, constitutes the register edge for the second paper-lining. 2. Method according to claim 1, characterised in that the sheet, after the turning, is fed onwards for the second paper-lining, in a feeding direction which is essentially perpendicular to the feeding direction in the first paper-lining, and in that the feeding direction for the second paper-lining is essentially perpendicular to the feeding direction after the turning. 3. Device in connection with paper-lining, characterised in that it comprises - a turning means (10) which is arranged after the discharge from a first paper-lining machine (12), as seen in its feeding direction (Ml), capable of turning a paper-lined sheet so that its top side is positioned downwards, - a feeding means (22), arranged after the turning means (10), capable of feeding the turned sheet onwards in a feeding direction (M2) and into - a second paper-lining machine (26), which is capable of paper-lining the sheet on the uncoated side, whereby the edge of the sheet and the first layer, hereinafter denoted register edge, which is used in the orientation of these in the first paper-lining, constitutes the register edge for the second paper-lining. 4. Device according to claim 3, characterised in that the feeding means (22) is feeding the turned sheets in a direction (M2), which is essentially perpendicular to the feeding direction (Ml) from the first paper-lining machine (12). 5. Device according to claim 4, characterised in that the second paper-lining machine is arranged in relation to the feeding means, so that the feeding direction (M3) of the second paper-lining machine is essentially perpendicular to the feeding direction (M2) of the feeding means. 6. Device according to claim 3, characterised in that the turning means (22) comprises a rotatable shaft (14), which is oriented perpendicularly to the feeding di- rection (Ml) of the first paper-lining machine, a number of sticks (20), arranged both parallel to the shaft and with a certain angle (α) in relation to each other, seen about the circumference of the shaft. 7. Device according to claim 6, characterised in means capable of rotating the shaft this angle (α) after a paper-lined sheet having been discharged from the first paper-lining machine and fed into the turning means. 8. Device in connection with paper-lining, characterised in that it comprises - a turning means (10) which is arranged after the discharge from a first paper-lining machine (12), as seen in its feeding direction (Ml), capable of turning at least one paper-lined sheet so that its top side is positioned downwards, - a first feeding means (22), arranged after the turning means (10), capable of feeding the turned sheet onwards in a feeding direction (M2), - a second feeding means (28), arranged before the turning means, capable of feeding at least one unturned sheet onwards in a feeding direction (M2), and one stacking means (24), capable of receiving and stacking the turned and unturned sheets. 9. Device according to claim 8, characterised in that a number of paper-lined sheets are fed into the turning means, and that they, alternately, are turned by the turning means (10) and fed onwards by the first feeding means (22) to the stacking means (24), and are fed onwards by the second feeding means (28) to the stacking means (24), whereby bundles of turned and unturned sheets are obtained in the stacking means.

Inventors: NYMAN LENNART, NYMAN, LENNART
Applicants: LAMINA SYSTEM AKTIEBOLAG, NYMAN LENNART, NYMAN, LENNART
Application year: 1999
Main classification: B31F5
IPC codes: B32B37, B65H15