JPS5940619B2 - Manufacturing method of cardboard - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a corrugated board comprising a single-sided corrugated board with a narrow liner disposed on an exposed core.

The present applicant had previously filed an application for a corrugated board and a corrugated box box in which a narrow liner is arranged only in the main part of the exposed core of a single-sided corrugated board for the purpose of saving liners (Utility Application No. 53).
-Cardboard box No. 087889, 17097-17097
Corrugated cardboard sheet with a back liner placed on the main part of No. 0, corrugated cardboard sheet with a front liner placed on the main part of Utility Application No. 54-069604), the present invention utilizes an existing corrugator and attaches some incidental equipment to it. The purpose of the present invention is to provide a method for producing the above-mentioned corrugated board by continuously dividing a sheet of liner base paper into a front liner and a back liner.

That is, in the method of the present application, a liner base paper 2 pulled out from a liner mill roll stand 1 is firstly cut continuously to produce a wide liner 2a and a narrow liner 2b, and the wide liner 2a is guided to a single facer 3. This is pulled out from the core mill roll stand 4 and formed into a step-formed core 5.
The single-sided corrugated board 25 is bonded to the narrow liner 2 to form a single-sided corrugated board 25, and the single-sided corrugated board 25 is passed through the bridge 6 and the like to the backer 7 without applying adhesive, while the narrow liner 2
b exits the corrugator and its side is covered with the single-sided cardboard 25
While traveling at a synchronous speed, the liner is continuously divided into a plurality of narrower liners 2ba, and these narrower liners 2ba are placed between the narrower liner feeder 8 and the direction guide 9. After twisting this large amount of the narrower liner 2ba and turning it over, each narrower liner 2ba is spread at a predetermined interval and guided into the corrugator again, and the adhesive surface is After continuously applying an adhesive, the narrower liner 2ba and the single-sided corrugated board 25 are bonded together.

The corrugator used in the present invention may be one that is commonly used, and therefore, the mill roll stand 1 for liners may also be the commonly used mill roll stand 1 for A or 8-tier liners, but the width of the narrow liner 2b If the liner base paper 2 is to be mounted quite wide, a mill roll stand 1 with a wide mounting width for the liner base paper 2 may be specially installed behind the A-stage inner mill roll stand 1 in the flow direction of the corrugator (see Fig. 3). reference).

The continuous first cutting of the liner base paper 2 is performed by the liner mill roll stand 1 and the liner preheater 10.
The upper blade 11 is attached to the upper and lower shafts provided between the upper and lower shafts, respectively.
a. It is carried out by the cutter 11 consisting of the lower blade 11b,
As mentioned above, if the space between the mill roll stand 1 and the liner preheater 10 is too narrow, such as when using the A-stage or 8-stage liner mill roll stand 1, the liner mill roll stand side of the liner preheater 10 should be The auxiliary roll 10a may be substituted for the lower blade 11b, and the upper blade 11a may be placed thereon.

The wide liner 2a thus made by first dividing
The width corresponds to the width of the intended finished corrugated board 190, and the width of one narrow liner 2b corresponds to the desired total coverage area (location to be reinforced) of the core 5 of the single-sided corrugated board 25 to which it is laminated. It is determined as follows.

As described above, the wide liner 2a is laminated with the core 5 to form the single-sided corrugated board 25, and the process of reaching the backer 7 via a take-up conveyor, a bridge 6, etc. is a conventional method and will not be described in detail.

In this step, a feature of the manufacturing method of the present invention is that no adhesive is applied to the top of the corrugation of the core 5 of the single-sided corrugated board 25.

The narrow liner 2b travels to the side of the corrugator so that it is guided by an appropriate number of liner guides 12 attached to the side of the corrugator and travels to a predetermined position.

The structure of the liner guide 12 may be of a normal type, for example, it may be made into a rod shape and attached obliquely to a suitable member on the side of the corrugator, or it may be made into a rail shape and attached to the narrow liner 2b. Alternatively, a so-called comb roll may be used.

The narrow liner 2b is supported by an appropriate number of support rolls 13 installed at an appropriate height above the floor surface, and travels while maintaining a desired altitude.

The second cutting of the narrow liner 2b is carried out by a cutter 14, which is installed rearward in the flow direction of the even narrower liner feeder 8 and has an appropriate number of upper and lower teeth 14a and 14b, respectively, which are vertically fixed. The narrower liner 2ba is made with the desired width and the desired number of sheets, but before applying the cutter 14, the narrower liner 2b is cut back and forth two times.
It is preferable to bring the upper and lower surfaces of the liners into contact with the lined rolls 15 alternately, since the narrow liner 2b will be appropriately tensioned and reach the cutter 14.

The narrower liner 2ba produced in this manner further travels to the narrower liner feeder 8, is further accelerated, and is relaxed while reaching the direction guide 9.

This loosening of the narrower liners 2ba is a measure for smoothly changing the direction of the narrower liners toward the corrugator and turning the narrower liners 2ba inside out as necessary.

In this way, accidental cutting of the narrower liner 2ba can be prevented.

When the narrower liner 2ba is turned inside out if necessary, if the front and back sides of the liner 2ba have different aesthetics, it is preferable to attach it to the single-sided cardboard 25 so as to expose the surface with a more aesthetic appearance. This measure was taken in consideration of the

The narrower liner 2ba is reintroduced into the corrugator by the directional guide 9. The direction may be changed so that the narrower liner 2ba is intertwined with the narrower liner 2ba.

Alternatively, the direction guide 9 may be formed into a comb roll shape with an appropriate number of comb teeth 9a attached at predetermined intervals, and the narrower liner 2ba may be expanded to the predetermined intervals at the same time as the direction is changed.

The spreading movement of the narrower liner 2ba is not necessarily performed at the same time as the direction change of the liner 2ba, but may be performed before and/or after the direction change.

In either case, a comb roll is used, but it is preferable to do this at a position as close to the backer 7 as possible, as this can better prevent displacement of the running position.

In this way, the narrower liner 2ba reintroduced into the corrugator passes through the front liner 1-phase preheater 16 of the triple preheater and the front liner 1-phase auxiliary preheater 17a of the glue unit 17, and then adhesive is applied to the adhesive surface of the flame. The adhesive is applied to the backer 7 as follows.

That is, a roll 18 is installed between the glue unit 17 and the backer 7, and the narrower liner 2ba is entwined with the roll 18 to change the running direction and run against the flow direction of the corrugator, so that the glue unit N7 After reaching the B flute glue machine 17b and applying adhesive to the adhesive surface there, the B flute auxiliary preheater 1
Reach 7C and invert again to reach backer 7.

At this point, it is also possible to make the roll 18 and/or the B flute auxiliary preheater 17C into a comb roll shape so that the narrower liner 2ba can be spread and the running position can be determined.

Alternatively, the adhesive may be applied by providing a squeegee-type adhesive applicator (not shown) between the glue unit 17 and the backer 7 so that the narrower liner 2ba exits the front liner one-phase auxiliary preheater 17a. The adhesive may be applied to the backer 7 while the backer 7 is being moved.

Thus, in the backer 7, a plurality of the narrower liners 2ba are added to reinforced portions (places to be reinforced) of the exposed core 5 of the single-sided corrugated board 25, such as the upper and lower ruled line portions, edges, upper and lower flap portions, etc. are laminated together to produce a finished corrugated board 19.

The present invention has a diagonal configuration, and by using this, the following effects can be obtained.

(1) By using the manufacturing method and apparatus of the present invention, it is possible to manufacture a corrugated board in which only the necessary part of the exposed core of the single-sided corrugated board or the part that is likely to be damaged after box production is reinforced with a liner.

(2) Since the present invention uses a single sheet of liner base paper as the front and back liner, there is no need to prepare the front and back liner base papers separately as in conventional corrugated board manufacturing, and therefore manufacturing efficiency can be greatly increased.

(3) Since the present invention relates to a method and apparatus for dividing liner base paper into an appropriate number of desired widths, it is easier to mount it on a mill roll stand than when using a narrower width liner that has been divided in advance; Thus, it is possible to handle a large number of narrower liners at the same time, and it is also possible to keep the paper condition of each narrower liner under the same conditions.

Therefore, handling of a large number of narrower liners does not cause manufacturing problems.

(4) Since the present invention applies the adhesive to the entire surface of the narrow liner, the strength of the narrow liner can be maintained even higher after the adhesive dries.

(5) The present invention relates to a method of loosening the narrower liner between the base paper feeder and the direction guide, and appropriately opening the legs of the narrower liner and positioning the liner between the direction guide and the backer. It is further possible to prevent the narrow liner from being cut during operation, and to precisely place the liner on a desired portion of the corrugated board.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a partially cutaway plan view showing an embodiment of the invention, Fig. 3 is a plan view showing a cut state of the liner base paper, and Fig. 4 is a main view of the present invention. FIG. 2 is a partially cutaway plan view of an example of corrugated board manufactured according to the invention. In the figure, 1 is a mill roll stand for liners, 2 is liner base paper, 2a is wide liner, 2b is narrow liner, 2b
a is a narrower liner, 5 is a core, 8 is a narrower liner feeding machine, 9 is a directional guide, 11 is a cutter, 12 is a liner guide, 14 is a cutter, 19 is a finished corrugated board, and 25 is a single-sided corrugated board. show.

Claims (1)

[Claims] 1. A liner base paper pulled out from a liner mill roll stand is first divided into a wide liner and a narrow liner, and the wide liner is guided to a single facer, which is then cut into a core. The material is pulled out from a mill roll stand, formed into tiers and glued to the core to make a single-sided corrugated board, and the single-sided corrugated board is passed through a bridge top etc. to the backer without applying adhesive, while the narrow width The liner exits the corrugator and is continuously divided into a second stage while running along the side of the corrugator at a speed synchronized with the single-sided corrugated board and the single-sided corrugated board, and a plurality of narrower liners are separated by an even narrower liner feeder and a directional guide. In between, the narrower liners are loosened, and each narrower liner is expanded and introduced into the corrugator again. After continuous application of adhesive to each bonding surface, these narrower liners and the single-sided corrugated board are bonded. A method of manufacturing cardboard that is characterized by its pressing.