JPS5859831A - Manufacture of five-layer corrugated cardboard - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing five-layer corrugated board.

The conventional manufacturing method for 5-layer corrugated board is to produce two so-called two-sided corrugated boards in which a corrugated core paper is attached to a liner, and then to apply the single-sided corrugated boards on both sides of separate liners so that the liner becomes the front surface. They are bonded together to form a five-layer corrugated board. However, when implementing this manufacturing method, upper and lower stepped rolls are used to roll up the core paper in steps.

A single-sided corrugated board manufacturing device, that is, two single facers, is required in combination with a pressure roll for laminating the corrugated core paper to the liner, and the single-sided corrugated board produced by the single facer is a corrugated board. The bonding of the corrugated paper and liner is intensely pressed by the nip pressure between the lower corrugated roll surface and the pressure roll surface that is pressed against it, resulting in press marks that are difficult to avoid on the liner surface. Since the adhesive liner is used as the surface and the liner is polymerized and pasted on both sides of a separate liner using a conveyor, press marks appear on both sides of the manufactured five-layer corrugated board, which has the disadvantage of detracting from its commercial value.

Furthermore, there is a drawback that the manufacturing equipment is necessarily complicated and expensive.

The present invention has been proposed in view of the above, and an object of the present invention is to provide a method for manufacturing beautiful five-layer corrugated board without press marks on both sides.

The present invention includes a first step of processing 2-row 8-sheet paper by passing 8 sheets of paper between each of two sets of corrugated rolls; and a third step of sandwiching the eight stepped sheets integrated with the liner and pasting each liner on the stepped core paper, respectively. do.

The present invention will now be described in detail based on the illustrated embodiment shown in FIG.

In the figure, 1a+'' is an upper stepped roll that meshes with each other, 2a and 2b are lower stepped rolls that also mesh with each other, and both have steps with the same pitch on their circumference. In addition, the inner corrugated rolls lb and 2a are placed opposite each other so as to be in contact with each other at the top lines of the respective corrugations. These □ roll groups are driven synchronously by a drive source (not shown). 8 is a glued roll. Device, 4 is center liner, 5゜5
' is the outer liner, 6. ．． 6' is 8 sheets of paper, 7.7' is a conveyor with a heating device installed vertically, and 8 sheets of stepped paper 6, 6' pasted on both sides of the center liner 4 and the outer liner 5, which is supplied separately. This is a device that conveys the film while sandwiching and bonding the facer 5', and is collectively referred to as a double facer F.

Now, in such a device, eight sheets of paper 6 and 6' are bitten by corrugated rolls 1a+tb, 2a and 2b to form eight sheets of corrugated sheet, and after being glued to the top of the corrugated portion by gluing device W8, 1 It is caught between the steps of the stepped rolls lb and 2a. On the other hand, since the center liner 4 is fed between the eight stepped sheets 6 and 6', these eight sheets are strongly pressed by the steps of the stepped rolls Ib and 2a, and are laminated as one unit. will be sent to the This semi-finished product passes between the gluing devices 8 and
After being glued to the top of the steps of the papers 6 and 6', they are sent between the conveyors 7 and 7' of the double facer F together with the separately supplied outer liner 5 and 5', and are sandwiched between the belts and heated to be polymerized and pasted. , are integrated into a 5-layer cardboard P.

In this device, as is clear from one drawing.

The pressure roll that is indispensable in the conventional single facer device is omitted, and the center liner 4 and the stepped 8 paper 6.6' are laminated between the stepped rolls 1b and 2a. The stepped rolls la and 2b also function as backup rolls, and the required nip pressure is applied to the stepped roll t.
b.

It has been given for 23 years.

As described above, according to the two methods of the present invention, the manufacturing equipment is simplified and the equipment cost is reduced. or.

The surface of the manufactured five-layer corrugated board is extremely beautiful without any press marks as in the past, and has high commercial value.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an outline of an apparatus for implementing the method of the present invention. la, lb...upper stepped roll, 2a, 2b...
Lower stepped roll, 4...center liner, 5.5'.
...Outer liner, 6.6'...8 paper, 7. 'I'・
...Conveyor with heating device.

Claims (1)

[Claims] A first step in which two sets of corrugated core paper are processed by passing the core paper between two sets of corrugated rolls, and a second step in which the corrugated core paper is pasted on both sides of one liner, respectively. and an eighth step of sandwiching the corrugated core paper integrated with the liner and attaching each separate liner to the corrugated core paper, respectively. Production method.