JPH0557895B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a corrugated board whose surface is laminated with a plastic member such as a plastic film, a plastic foam sheet, or a plastic flat yarn cloth.

A method for manufacturing corrugated board whose surface is laminated with a plastic member such as a plastic film has been filed by the present applicant as Japanese Patent Application No. 163974/1982 and has already been published. The method used paper that had already been laminated with plastic film as a base liner paper that was fed into the double facer section of a corrugating machine.

As is well known, in the production of general corrugated board, a special method using starch according to the invention of Stainhall is widely used for adhesion between core and liner. In other words, the method uses a low-viscosity glue in which raw starch is suspended and dispersed in a gelatinized starch solution, which is applied to the top of the corrugated core, and heated during adhesion to gelatinize the raw starch. Along with letting
It absorbs water in the solution and rapidly increases its viscosity to perform instant bonding.

Conventional corrugating machines are related to the implementation of this stain hole invention, and in the double facer part, it is necessary to adhere the face liner base paper to the corrugation top of the center core of the single-sided corrugated board, so it is coated on the corrugation top in the previous process. A heating section is provided to gelatinize the starch paste, and the amount of heat required to gelatinize the starch paste is increased while the corrugated cardboard structure, which is a combination of one-sided corrugated board and outer liner base paper, slides on the hot plate of the heating section. After that, the adhesion of the front liner is completed.

Conventional corrugating machines have such a structure, so if a liner base paper laminated with plastic film is used, the plastic film will melt when it comes into contact with the hot plate, and the friction with it will prevent the corrugated structure from sliding. There was a problem in which the corrugate machine stopped from the beginning and became completely unable to operate.

Therefore, the present applicant has attempted to solve the above problem by providing a free belt that slides on the hot plate in the heating section, and configuring the corrugated cardboard structure to pass over the hot plate accompanied by the free belt. Although we succeeded in mass producing corrugated cardboard laminated with plastic parts, since the front liner base paper was already laminated with plastic parts, the base paper roll was very bulky with the plastic parts, and Not only is it inconvenient to handle, but the length of the base paper is short compared to its bulk, so it is necessary to frequently feed rolls of base paper at short intervals.

In addition, with the recent diversification of customer preferences, orders for laminated corrugated cardboard made from plastic materials are also becoming smaller. For example, when the plastic member is a film, orders are divided into smaller pieces depending on the material, thickness, color, etc. of the plastic, so it is necessary to respond to these needs. When responding to orders at a normal-sized corrugated board factory, a single corrugating machine would produce several types of corrugated board in sequence within a single day, so the mill roll stand on the double facer side would require different types of corrugated board. A problem has arisen in which the work of frequently exchanging rolls of different types of liner base paper has led to an extreme deterioration in the production efficiency of corrugated board.

This was true not only for the laminated corrugated board in the double facer section, but also in the case of producing a single facer section in which a plastic member was laminated to the back liner base paper.

Purpose of the Invention In view of the actual situation associated with the production of laminated corrugated board made of plastic members as described above, the present invention provides a single backing of paper and/or a mill roll stand on the single facer side and/or double facer side
Another object of the present invention is to make it possible to manufacture laminated corrugated boards of various plastic members even if a front liner base paper roll is always provided.

Structure of the Invention In other words, the structure of the present invention for achieving the above object is to provide a corrugated board manufacturing apparatus in which a liner base paper and a plastic member are laminated to the base paper on at least one corrugated top of a corrugated core. The present invention is characterized in that a device for laminating the above-mentioned plastic member onto the liner base paper for the facer part and/or the double facer part is connected to the single facer part and/or the double facer part of the corrugating machine. In particular, on the double facer side of a corrugating machine, a free belt that can circulate around the heat generating part and slide on the hot plate is provided below the corrugating belt of the double facer part, and the free belt absorbs the heat of the heat generating part. In a corrugating machine in which the material is loosely transmitted to the front liner, a laminating device for laminating a plastic member to the front liner base paper is provided between the double facer section and the mill roll stand for the front liner base paper.

Embodiment 1 Figures 1 and 2 show an embodiment of the present invention on the double facer side of a corrugating machine.
A mill roll stand 5 for the back liner base paper 2a and a mill roll stand 6 for the back liner base paper 2a are provided, and a mill roll stand 7 for the front liner base paper 3a is provided on the double facer portion D side.
A laminating device L for the plastic member P is provided between the inlet 21 of the double facer section D, and a free belt 24 that circulates around the heat generating section 22 and slides on the hot plate 23 is provided in the double facer section D. There is.

As will be described later, the free belt 24 circulates as it moves through contact with the corrugated cardboard structure _F2 , but even if it is supplementally driven, it does not go against the spirit of the invention. do not have.

The illustrated laminating apparatus L uses a known extrusion laminating method. That is, the front liner base paper 3a sent out from the mill roll stand 7 passes through the guide roll 31 and is fed between the pressure roll 32 and the cooling roll 33.
On the other hand, the plastic material fed into the hopper 34 is heated and melted by the extruder 35 and is then transferred to the T-die 3.
The film-like plastic member P is extruded from the slit No. 6 into a film having a constant thickness, flows between a pressure roll 32 and a cooling roll 33, and is laminated onto the outer liner base paper 3a. The front liner base paper 3b on which the film plastic member P is laminated in this manner is fed into the entrance 21 of the double facer section D via guide rolls 37 and 38.

Next, regarding the corrugated board assembly process, in the single facer section S, the core raw paper 1a sent out from the mill roll stand 5 is transferred to the corrugated roll 1.
It is rolled between steps 1 and 12 and corrugated, and starch glue is applied to the top of the steps by a glue roll 13. On the other hand, the back liner base paper 2a sent out from the mill roll stand 6 is adhered to the corrugated top of the core 1 by a press roll 14, thereby forming a single-sided corrugated board _F1 .

In the single-sided corrugated board _F1 , starch paste is applied to the other corrugated top of the core 1 before the double facer part D by a glue roll 15, and in the double facer part D, it is combined with the front liner base paper 2a to form a corrugated board structure. A field F ₂ is constructed.

The corrugated cardboard structure F ₂ runs on the heating section 22 by the drive of the corrugating belt 26 , but a free belt 24 is placed on the hot plate 23 of the heating section 22 .
is placed so that the plastic member P of the film comes into contact with its free belt 24, and due to the frictional force therebetween, the corrugated cardboard structure _F2 entrains the free belt 24. Therefore, the plastic member P does not rub against the free belt 24, and even if the plastic member P is in close contact with the free belt 24 while running on the heating section 22, it receives heat indirectly from the heating section 22 and therefore does not melt due to heat. While passing over the heating section 22, the corrugated cardboard structure _F2 receives the amount of heat required to gelatinize the fine powder paste, and the adhesion between the core 1 and the front liner 3 is completed. Finally, after being cooled by the cooling belt 27,
It is cut by the cutter 28 and completed as a corrugated cardboard F of a certain size, and as shown in FIG. 2, the front liner 3
A corrugated board F having a film plastic member P laminated on the surface thereof is obtained.

Therefore, in the above-mentioned cardboard manufacturing equipment,
The film material of the plastic member P of the corrugated board F can be changed depending on the type of plastic material fed into the hopper 34 of the laminating device L.
Further, the thickness of the film can be changed depending on the type of die 36, and colored film corrugated board can also be produced by mixing pigments into the plastic material.

Embodiment 2 FIG. 3 shows another embodiment of the laminating apparatus L, which is capable of laminating plastic members P such as films and foam sheets in addition to the mill roll stand 7 for the front liner base paper 3a. A mill roll stand 40 is provided for feeding in rolls. Then, the plastic member P is laminated to the front liner base paper 3a with adhesive, and the laminated front liner base paper 3b is placed at the entrance 2 of the double facer section D.
It is now renormalized into 1.

Lamination is carried out by a known wet lamination method, in which the adhesive in the pan 41 is transferred from a primary coating roll 42 to a secondary coating roll 43.
The adhesive is applied to the plastic member P by the roll 43, and the plastic member P
is the applicator roll 4 together with the front liner base paper 3a.
4 and a press roll 45 and then laminated. 48 is a drying device. As the adhesive, polyvinyl acetate, starch glue, etc. are used. In addition to such a wet laminating device L, a dry laminating device, a hot melt laminating device, etc. can also be effectively used.

Embodiment 3 FIGS. 4 and 5 show an example in which the present invention is implemented in a single facer section S. FIG. FIG. 2 is a structural diagram in which an extrusion device La for plastic film lamination is interposed.

On the other hand, FIG. 5 shows a device for laminating a plastic film P on the front side of the back liner base paper 2a via an adhesive device G between the mill roll stand 6 and the press roll 14 of the back liner base paper 2a.
It is a block diagram in which Lb is provided.

In this way, the present invention allows a plastic material laminating device to be installed not only in the double facer part but also in the single facer part, and can be used for double-sided laminated corrugated cardboard with both sides covered with plastic material, Single-sided laminated cardboard coated with plastic material, etc.
It can be manufactured freely.

Effects of the Invention As explained above, this invention provides a device for laminating plastic members for the front and back liner base papers between the single facer part and/or the double facer part and the mill roll stand for the front and back liner base papers. When manufacturing laminated corrugated cardboard with plastic members such as films and foam sheets, there is no need to prepare laminate liner paper on which the plastic members are already laminated, and a single ordinary base paper is used as the liner base paper. can. Therefore, the roll of liner base paper does not become bulky, and a large amount of corrugated board can be continuously manufactured with one liner base paper roll.
Moreover, the type of plastic material can be changed simply by switching operations in the laminating device, and the liner base paper roll continues to use the same single paper, which eliminates the need for frequent replacement. This has an excellent effect of greatly increasing manufacturing efficiency.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention on the double facer side, FIG. 1 is a schematic configuration diagram showing the device, and FIG. 2 is a sectional view of a corrugated board manufactured by the same. Further, FIG. 3 is an explanatory diagram showing an outline of the main parts of the device according to another embodiment on the double facer side. 4 and 5 are main part configuration diagrams showing an embodiment of the present invention on the single facer side, FIG. 4 is a configuration diagram using an extrusion method, and FIG. 5 is a configuration diagram using an adhesive method. It is. S... Single facer part, D... Double facer part, L... Laminating device, P... Plastic member, 3a... Front liner base paper, 7... Mill roll stand, 22... Heat generating part, 23... ...Hot plate, 24...Free belt, 26...Corrugating belt.

Claims (1)

[Scope of Claims] 1. In a corrugated board manufacturing apparatus in which a liner base paper and a plastic member are laminated to the base paper on at least one corrugated top of a corrugated core, a corrugated board manufacturing apparatus for a single facer portion and/or a double facer portion is provided. 1. An apparatus for manufacturing laminated corrugated cardboard made of plastic members, characterized in that a device for laminating the above-mentioned plastic members onto a liner base paper is connected to a single facer section and/or a double facer section of a corrugating machine. 2. A free belt that can circulate around the heat generating part and slide on the hot plate is provided below the corrugating belt of the double facer part, so that the free belt relaxes and transfers the heat of the heat generating part to the front liner. 1. An apparatus for manufacturing laminated corrugated board made of plastic members, characterized in that a corrugating machine is provided with a laminating device for laminating plastic members to the outer liner paper between the double facer section and the mill roll stand for the outer liner base paper.