JPS6144668B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of bonding and forming a plastic film on one side of a base material such as paper. The present invention relates to a method of continuously heat bonding a film or a polyolefin film such as polypropylene using an adhesion aid, and at the same time closing the holes in the base material.

Conventional methods for bonding paper and plastic film have mainly been through adhesives dissolved in solvents.

Therefore, when using adhesive-coated paper or plastic film, not only does it take time for the solvent in the adhesive to dissipate, but also the solvent remains unavoidable.
For this reason, when a container such as a box is made from a product in which the two are glued together, there is a risk that the solvent will diffuse into the container, and the residual odor will be large, making it particularly unsuitable as a food container.

In addition, if the paper or plastic film is coated with adhesive before the product is used, even if the solvent is completely dissipated, the adhesive will become sticky and cannot be stacked, so the adhesive coating and film pasting processes must be directly linked. However, it also had the disadvantage of poor work efficiency because it was not possible to separate labor in each process.

Furthermore, it consumes a large amount of thermal and mechanical energy to heat and dry the product in order to dissipate the solvent in the adhesive, and workability is poor, such as the need to strictly control the concentration of the adhesive. Another drawback was that the film deteriorated significantly due to solvent diffusion.

In addition to these methods, there is also a method of laminating hot melt resin on one side of a base material such as paper, but the equipment and processes for this are extremely complicated and large-scale, making it difficult to implement easily. A serious drawback was that the pores in the material could not be filled with the hot melt resin.

This invention was developed in order to eliminate all the drawbacks of the above-mentioned conventional examples, and its first feature is that an adhesion aid layer of tributyl titanate is coated on the surface of a base material such as paper in advance. Then, the surface of the adhesion aid layer is heated, and a plastic film such as polyolefin is bonded by pressure and heat to the heated surface of the adhesion aid layer. The present invention provides a method for simultaneously forming a plastic film on the adhesion promoter layer surface of a substrate with holes and simultaneously blocking the holes in the substrate. A second feature is that holes are made in advance on the surface of a base material such as paper, an adhesion aid layer of tributyl titanate is coated on the base material surface, and then an adhesion aid layer is formed on the surface of the base material. is heated, and a plastic film such as polyolefin is bonded under pressure to the heated surface of the adhesive layer, and the holes are closed with the film. The present invention provides a method of attaching a film and simultaneously sealing holes in a base material.

The invention will now be described in detail with reference to the illustrated embodiments.

In FIG. 1, reference numeral 1 denotes a long base material such as paper or thin aluminum plate, in which appropriate holes 1A are made transparent, and then an adhesion aid layer 2 of tributyl titanate is preliminarily applied to one surface of the base material 1. Through hole 2 in hole 1A part
A can be formed evenly with a uniform thickness by a well-known coating method, or after the adhesion aid layer 2 is evenly coated on the base material, holes 1A are made in the base material and holes are formed in the adhesion aid layer at the same time. 2A is transparently installed as shown in FIG.

Then, an adhesion promoter layer 2 is formed on the base material 1,
Then, as shown in FIG. 2, a long sheet 3 with appropriate holes 1A and 2A is passed from a supply drum 4 to a take-up drum 8 via pinch rollers 5a and 5b, a cooling roll 6, and a back-up roll 7. Configure to wind at speed.

On the other hand, a heat source 9 is disposed between the pinch roller 5a and the cooling roll 6 (or between the roller 5b and the back-up roll 7) for evenly heating the adhesive layer 2. Guide rollers 11, 11 from another supply drum 10 are placed between the adhesion promoter layer 2 and the cooling roll 6.
The plastic film 12 made of polyethylene or the like that is fed through the feeder is fed by a self-biting action.

Therefore, the plastic film 12 is forcibly pressed and fed by the cooling roll 6 and the back-up roll 7 onto the adhesive agent layer 2 which has been heated to about 200 to 300 degrees by the heating source 9. Therefore, the plastic film 12 is instantaneously heated and melted and bonded at this portion, and the film surface opposite to this bonded surface is cooled by the cooling roll 6 and fed, so that the film 12 itself is not deformed and the third step is completed. To continuously mass-produce a product 13 according to the present invention in which a plastic film 12 is beautifully adhered and formed on an adhesion aid layer 2 as shown in the figure, and at the same time holes 1A and 2A are beautifully closed with the film 12. I can do it.

In addition, this invention uses a heating source 9 as shown in FIG.
may be placed under the running path of the elongated sheet 3 and brought under the sheet 3 of the running path of the plastic film 12. In this case, the efficiency of heating the adhesive layer 2 by the heat source 9 is increased. Get better.

As described above, according to the present invention, an adhesion aid layer of tributyl titanate is coated in advance on the surface of a base material such as paper, appropriate holes are made in the base material, and then the An adhesion aid for a substrate with holes, characterized in that the surface of the adhesion promoter layer is heated, a plastic film such as polyolefin is bonded under pressure to the heated surface of the bonding promoter layer, and the holes are plugged with the film. At the same time, a plastic film is attached to the surface of the agent layer and the holes in the base material are closed.
As a second example, holes are made in advance on the surface of a base material such as paper, an adhesion aid layer of tributyl titanate is coated on the base material surface, and then the surface of the adhesion aid layer is heated. Then, a plastic film such as polyolefin is bonded under pressure and heat to the heated adhesion promoter layer surface, and the holes are closed with the film. Since the holes in the base material can be closed at the same time as the adhesive is formed, the holes in the base material can be beautifully closed with a film, creating a sealed container whose interior can be seen through the window hole, which is neatly closed with a transparent film. can be mass-produced at extremely low cost.

In addition, according to the present invention, the coated side of the base material such as paper coated with the adhesive aid in advance and other surfaces are completely free of stickiness and are in a smooth state, so it can be rolled or stacked. Blocking does not occur even when stacked.

Therefore, the adhesion aid application process and the film adhesion process can be completely separated and can be performed at different locations, allowing division of labor in each process and greatly improving work efficiency.

Furthermore, according to the present invention, the solution concentration of the adhesion aid is
Because it is extremely dilute at 0.01 to 0.1%, it has almost no viscosity compared to the conventional adhesives mentioned above, where the solid concentration in the solution is around 10%, so thermal and kinetic energy for solvent dissipation is required. It is possible to save energy and labor by making the solution extremely small.Moreover, the solution has almost no viscosity and is completely dry and non-sticky, making it easier to work with. It can save money and prevent the problem of residual odor in product containers.

Furthermore, compared to the conventional method of simply laminating the hot melt resin onto the base material, the present invention has the advantage that it is possible to close the window holes, and the equipment and process are each orders of magnitude simpler, making it extremely easy to implement. In addition, it is a new and useful invention that has great industrial and economical effects as it can be mass-produced at extremely low cost.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view showing a part of a long sheet with an adhesion promoter layer formed on one side of the base material, FIG. 2 is a configuration diagram showing an example of an embodiment of the present invention, and FIG. 3 is a diagram showing the invention. A partially enlarged sectional view showing an example of a product by
FIG. 4 is a configuration diagram showing an example of another embodiment of the present invention. 1...Base material, 1A...Hole in base material, 2...Adhesion aid layer, 2A...Hole in adhesion aid layer, 3...Long sheet, 4...Supply drum, 5a, 5b... Pinch roller, 6... Cooling roll, 7... Backup roll, 8... Take-up drum, 9... Heat source, 10... Supply drum, 11... Guide roller, 12... Plastic film, 13...
…product.

Claims (1)

[Claims] 1. After coating and forming an adhesion aid layer 2 of tributyl titanate on two sides of a base material 1 such as paper in advance, appropriate holes 1A and 2A are formed in the base material 1. Next, the adhesion aid layer 2 is heated, and a plastic film 12 such as polyolefin is bonded to the heated adhesion aid layer 2 under pressure.
2A with the film 12. A method of simultaneously forming a plastic film on the adhesion promoter layer surface of a perforated base material and simultaneously plugging the holes of the base material. 2. A hole 1A is made in advance in a base material 1 such as paper, an adhesion aid layer 2 of tributyl titanate is coated on the base material 1, and then the adhesion aid layer 2 is heated, A plastic film 12 such as polyolefin is bonded to the heated adhesion aid layer 2 under pressure, and the holes 1A are bonded to the film 12.
A method of forming a plastic film on the adhesion promoter layer surface of a substrate with holes and simultaneously blocking the holes of the substrate.