JPS5924669A - Print lamination method - 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 print laminating a plastic film onto a surface of printing paper or the like by a simple means without using adhesives or solvents.

As is well known, paper products such as folding cartons, publications, cards, posters, and other printed matter (hereinafter referred to as printing paper, etc.) are made with In many cases, a plastic film is laminated on the surface for the purpose of printing, etc., and this type of processing is generally referred to as "print lamination" in the industry.

Conventionally, this print lamination involves applying a cleaning agent dissolved in an organic solvent to the plastic film in the coating section of the laminator, scattering the organic solvent in a drying device, and then applying adhesive to the plastic film.
This is done by applying heat and pressure to one side and printing paper. However, the method using organic solvents has problems in terms of safety in drawing, such as the danger of H1 fires, as well as in terms of environmental protection, such as the generation of odors and air pollution. However, there has been a strong demand for a lamination method that does not require the use of organic solvents.

Kihatsu 1'! 11iJ, in view of the above technical issues,
As a result of intensive research, the inventors of the wood industry have come up with a method for laminating plastic films onto the surface of printing paper using simple means without using adhesives or solvents. In the back, the gist is that the heat-sensitive adhesive resin layer of the composite polypropylene film on which the adhesive resin layer is laminated is aligned with the printed surface of printing paper, etc. Feeding 12.The composite polypropylene film comes into contact with the heated metal roll side, and the rubber!
Place the printing paper between the metal roll and rubber roll so that it is in contact with the goal side.

1. The following is the revision i71 of Kihatsu FJl'l's Il, aφ.

Boria°tJ pyrene thread fill in undeveloped rI11”
PolyzolopyrenoIt' with a n-heptano extraction residue of 90% or more, a propylene (se-olefin copolymer) with a Q-olefin content of Rt of 5 mol% or more, or Propylene content is 95 mol% or more
1% J of propylene homopolymer and propylene-α-olefin copolymer blended as follows.

and the film of the great invention gBB film scraps generated during BB are mixed 1-2. Refers to a film made of polypropylene resin, etc. If, there is no particular restriction, but usually a film with a thickness of 15 to 20 μm is preferably used. .

Additionally, polypropylene films with coloring or surface matte treatment, as well as those to which lubricants, anti-blocking agents, stabilizers, ultraviolet absorbers, antistatic agents, etc. have been added, can also be used in Kippatsu 1.1. There are so many things that can happen. At this time, it is preferable to use a polypropylene film that has been stretched 1l-12 axes, but it may be unstretched or uniaxially stretched.

In addition, the heat-sensitive adhesive resin layer on one side of the composite polypropylene film laminated on the polypropylene film may be made of polyethylene or a material containing at least 70% by weight (preferably (rJ: 85% or more) of ethylene). Polymer, sludge or total ethylene content is 70%
A layer consisting of a mixture of if + polymers such that (skillfully tris 5 weight M1%) or less is desirable. There are no particular restrictions on the monomer to be copolymerized with ethylene, and any monomer that can be copolymerized with ethylene may be used. For example, propylene, butene-1, mugisene-1,
Vinyl acetate.

Examples include ethyl acrylate and acrylic acid.

It's too easy to use, after copolymerization, water decomposition or cross-linking with metal ions, or graft polymerization with maleic anhydride, etc.
C items can also provide the benefits of great inventions. However, if the total ethylene content is less than 70 FJit96,
It is necessary to be careful because the culm and film waste generated in the slitting process cannot be returned to the polypropylene layer and used for 4'+1, which may not be preferable from the viewpoint of resource conservation. If X7 were used, and if these were deliberately returned, the attractivity, slipperiness, dimensional stability, etc. deteriorated to 11, and it was compared to polypropylene film.
This is because there is a possibility that something impractical may occur.

Therefore, the ethylene content of Tortal is at least 70 M%,
More specifically, 85 lit% or more is desirable. However, this value is of course not limited, and any polymer containing ethylene as a main component is sufficient. Lubricant and anti-blocking agent in the heat-sensitive adhesive resin layer.

It is also true that products to which stabilizers, colorants, ultraviolet absorbers, antistatic agents, etc. have been added can also be used for wood-based products.

Method of laminating a heat-sensitive adhesive resin layer on a polypropylene film d9. Any known means may be used. It may be selected appropriately depending on the thickness of the heat-sensitive adhesive resin layer, the flatness of the surface of the printing paper, etc., the required adhesive strength, etc., but usually 1.
5 It is preferable.

This does not preclude the use of a thickness of 511" or more, but it does not prevent unnecessary layers 19. becomes.

The heat-sensitive adhesive resin layer is preferably subjected to a corona discharge treatment in a nitrogen atmosphere, if necessary, in order to provide thermal adhesion to printing paper and the like. The effect is recognized when the residual oxygen concentration in the atmosphere is less than 20.9% by volume, and the lower the residual oxygen concentration, the greater the effect.
< is 5% by volume or less.

However, this is of course not subject to any restrictions;
For example, it can be carried out in the air at any time.

At this time, for example, eye II Ni! L/da corona discharge treatment P
11 Strength and film during processing? The quality is the desired adhesive strength J
It may be selected appropriately depending on Sr, but 1 usually 30-1.50
W, min/nf, Uzo~90°C is suitable. Any method known in the art may be used to create a small carbonaceous atmosphere.For example, the entire corona discharge treatment mechanism may be enclosed in a box and the air inside may be decoyed with nitrogen gas, or nitrogen gas may be introduced into the corona hQ electric bar through a slit. Examples include how to ask questions.

It can also be carried out by repeating mold treatment 11 for 10 minutes, but in general, the adhesive strength with printing paper etc. may be poor.

The composite polypropylene film 1- (
Fall Chee y” IJ Lamination R + 1 Film) To.

Printing paper, etc., is placed on the roller B', but in the next step 1, it is carried out using pinch rolls. At this time, one side of the pinch roll
A metal roll heated to 60-130°C, preferably 80-120"C, and a rubber roll on the other hand,
'I iJ: 20 to 6 or more' 2, so that the heat-sensitive adhesive resin layer of the composite polypropylene thread film and the printing surface of printing paper etc. are brought together, and the film is placed on a metal roll,
The purpose is achieved by passing the printing paper or the like through the other rubber roll so that they are in contact with each other. At this time, the linear pressure is 40
1.0 KV- or more. d. Wrinkling may occur after one rod is bonded by thermocompression, so it is difficult to say that it is suitable.

As mentioned above, rubbing the film so that it is in contact with the metal roll side is so that the heat from the metal roll can effectively act on the film side, and whether it is a mirror surface or an embossed surface, it is beautiful. This prevents lamination with high adhesive strength.

Figure 1 illustrates the method of the great invention, showing the composite polypropylene yarn film (2) fed out by the film feeding section (1) and the printing paper fed out from the paper feeding section (3). (4
) is a heated metal roll (6) Togomuro/I/ tel
The printing paper that has been thermally bonded between (') and then wound up in the first winding section (7) is then cut to a fixed size and accumulated as cut pieces.

Figure 2 is a diagram explaining the conventional print lamination method;
After applying the adhesive dissolved in an organic solvent in step 2 and scattering the organic solvent in the drying section 0, the printing paper OQ fed out from the paper feed section 0, heating metal roll C11 and rubber roll (17 ) and then wound up in the first winding section (18) or accumulated as cut pieces.

Therefore, according to the above conventional method, the coding unit 02
A drying section and a drying section are indispensable, and the equipment is large-scale and expensive.It also poses a risk to work safety such as the risk of fire, and to environmental protection such as the generation of odors and air pollution.
-1 has a problem and the size of 1 inch is not good from the perspective of resource saving, but the great invention does not use any organic solvents, so it is understood that it is an excellent print lamination method that eliminates the drawbacks of the conventional method. can.

Next, specific examples of the great invention are listed as comparative examples.It goes without saying that the present invention is not limited to these examples.

<'t: ノ)ili Example 1 > Crystalline t′l melt-extruded film of poly-10-pyreno (thickness 7
5071) by a roll drawing machine at 130°C.
The film was stretched 5 times in the longitudinal direction, and then an M112 ethylene-vinyl acetate copolymer containing 112% by weight of vinyl acetate was laminated on the longitudinally-axially stretched film to a thickness of 3011 mm. 1 laterally at 160℃
It is a composite biaxially stretched polypropylene film that has been stretched 0 times.

The thickness of this film is 1871 mm, of which ethylene-
The thickness of the vinyl acetate copolymer layer was 3/Z.

<Example 2> Actual Mi The ethylene-vinyl acetate combined layer surface of the film obtained in Example 1 was treated at a film temperature of 60°C and a treatment strength of 60W 1 min/n in an atmosphere with various nitrogen and oxygen mixing ratios.
Corona discharge treatment was performed at f.

Next, this composite biaxially oriented polypropylene film and Mli-printed art paper were rolled for 20 m/fur in the predetermined alignment condition between metal rolls heated to various temperatures and rubber pinch rolls with a linear pressure of 50 ψ. Heat LT at the speed of ]
I arrived at E and laminated it.

The curl state and adhesive strength of the thus obtained laminate product are shown in FIG. In the figure, the vertical axis shows the temperature ((force) of the metal roll, and the horizontal axis shows the volume ratio of nitrogen/oxygen. In the A zone, the product curls, and in the B zone t-J, the good product is <X The C zone shows insufficient adhesion strength. Fig. 3 shows the preferable temperature range in the actual example 4., but is not limited thereto.

Depending on the product, there may be no problem even if it curls.1
There are some products that can be used even if the adhesive strength is slightly insufficient.
The strength of adhesion to the intestines varies depending on the material of the printing paper, etc.
In other words, as long as a metal roll heated by wood is used, it is an example.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the undeveloped IJ'l method, Fig. 2 is an explanatory diagram of the conventional method of removing FV1, and Fig. 3 is a curl state when laminated using a film showing an example of Kinoe FlliK. It is a graph showing the test results of adhesive strength. m...Film ejection part, (2)...Composite polypropylene thread film, (3)...Paper feeding part, (4)...Printing paper, (5)...Heating metal roll, ( 61... Rubber roll, +71... Winding section.

Claims (1)

[Scope of Claims] 1. A heat sensitive adhesive resin layer of a composite polypropylene film laminated with a heat sensitive adhesive resin layer and a printed surface of printing paper etc. are fed and heated. The composite polypropylene film is in contact with the roll side, and the printing paper, etc. is in contact with the rubber roll side.
;Print lamination method with r sign. 2. The print lamination method according to claim 1, wherein the one-color thermoadhesive resin layer is a polymer containing ethylene as a main component. 3 Linear pressure during thermocompression bonding is 20! 1y/c+++ or more. The print lamination method according to claim 1.