JPH0318585B2 - - Google Patents

Description

[Detailed description of the invention] Thermosetting resin decorative boards made of resins such as melamine, polyester, diallyl phthalate, benzoguanamine, etc. have a beautiful appearance, are excellent in abrasion resistance and heat resistance, and can withstand long-term use. Because it is hygienic and does not generate any dirt, it has become widely used as a surface material for furniture and as an interior material for buildings.

Furthermore, as a recent feature, the top plate for electric kotatsu,
More and more furniture is being mass-produced in factories using these decorative laminates, such as home dining tables and low tables. The surface of the decorative laminate is protected with a film-like material to prevent it from adhering to the product and also to prevent scratches during handling during processing.After the product is completed, this film-like material can be removed to remove the decorative surface. It has become common to reduce the number of man-hours required to remove substances adhered to the surface of the plate and to prevent a decrease in yield due to scratches.

On the other hand, for items used in architectural interiors, after the interior parts using decorative laminates and the installation of fixtures are completed, there is the next stage of work such as the installation of electrical appliances, plumbing work, etc., and tools used during construction. There is a strong demand for decorative boards with a film-like material attached to protect the surface, as there are scratches caused by contact with shoes, footprint-like scratches caused by gravel adhering to shoes, and adhesion of paint from surrounding areas. be.

For this reason, the protective film-like material that is pasted on the surface of the decorative board includes paper, synthetic resin film, etc., but since the pattern on the surface of the decorative board can be seen through the film-like material, and it is easy to peel off and hard to tear, transparent or A translucent thermoplastic resin film is preferred; the base material is a thin film made of polyethylene, polypropylene, vinyl chloride, etc., and in order to adhere the decorative board to this film, an adhesive that is tacky at room temperature is applied to one side of the base material. Most of the materials are coated or have a synthetic resin layer that becomes adhesive when heated instead of an adhesive formed on one side of the base material by methods such as coating, laminating, or co-extrusion.

However, when these thermoplastic film-based products are pasted onto a decorative board, they are subject to the force of pulling out the rolled film against its adhesiveness, the resistance of guide rolls, and other forces. It will elongate and be aligned with the surface of the decorative laminate as it is, and it will also be rolled by crimping, so the adhesive (glued) to the surface of the decorative laminate will vary in degree. It is always in a stretched state.

In particular, when the film is thin, when the adhesive is wound with strong adhesive strength, when the processing speed is high, when the tensile strength of the film itself is low, and when heat is applied to the film, the elongation of the film becomes large and the film Because the film tends to shrink after being applied,
The film will pull on the decorative laminate, resulting in disadvantages such as the decorative laminate being warped and the film itself peeling off from the edges over time.

Possible countermeasures to this problem include making the film thicker or rotating the roll at a constant torque, but this increases the cost of the film, complicates the equipment, and requires the film feed speed to be completely synchronized with the decorative laminate's movement speed. It is very difficult to do this, and if the speed of the film is faster than the speed of the decorative laminate, sagging will occur and wrinkles will appear on the surface of the attached film. On the other hand, if it is delayed, the film will potentially stretch, causing warping and peeling as described above.

Films that exhibit adhesive properties when heated have advantages such as being inexpensive and leaving no adhesive on the surface of the decorative board when removed, but they do not require heat to be applied to the film. Since it is necessary to apply the film, the tensile strength of the film decreases and it becomes easy to stretch, which has the disadvantage that the above-mentioned problems are likely to occur.

As described above, at present, a satisfactory device for adhering and pasting a film onto the surface of a decorative board flowing in a sheet or continuous manner has not yet been obtained.

In response to such a situation, the present invention at least makes the circumferential speed (surface speed) of the roll that aligns the film on the surface of the decorative laminate and performs the initial adhesion (adhesion) process between the decorative laminate and the film faster than the speed of the decorative laminate. As a result, the film applied to the surface of the decorative board is applied in a compressed state in the machine direction, making it possible to compensate for the elongation that existed in the film. As a result of testing under various conditions, it was found that it is better to make the peripheral speed of the roll 0.05 to 3% faster than the moving speed of the decorative board. If it is less than 0.05%, there will be no effect of increasing the peripheral speed. In addition, at 3% or more,
Wrinkles are likely to occur on the film, making stable application difficult. By increasing the circumferential speed of the roll by 0.05 to 3% faster than the moving speed of the decorative laminate, we provide an excellent method for solving various problems that conventionally occur due to film elongation. It is.

Examples of the present invention are shown below.

FIG. 1 shows an example of a masking film pasting device, in which a roller conveyor 12 and a pinch roller 4 are used to move the decorative board. A pressure roll 9 and a support roll 10 are arranged, an infrared heating device 3 for heating the decorative board is arranged on the insertion side of the decorative board (on the right side in the drawing), and a cutting machine 11 for cutting the film is arranged on the exit side. .

Melamine resin decorative board 2, thickness 1.2m/m, width
1280m/m, length 2400m/m (single leaf) is moved by roller conveyor 12 and pinch roller 4, and the surface temperature of the decorative board is raised to 30~30℃ using an infrared heating device.
Insert into pressure rolls 7 and 8 while heating to 45°C.

On the other hand, the width of the coextruded film (polyethylene layer: 45μ, EVA: 25μ, total thickness 70μ) in three ways, in which polyethylene and EVA form two layers, is 1290.
A roll 1 of m/m is attached in the direction in which the EVA layer is on the surface of the decorative board, the film is pulled out by the pull-out roll 5, passed through the guide roll 6, and then placed along the surface of the upper pressure roll 7. After synchronizing the circumferential speed, it is superimposed on the surface of the decorative board, and simultaneously pressed with upper and lower pressure rolls to perform the initial stages of degassing and adhesion. At this time, the feeding speed of the other rolls except the upper pressure roll was set to 10 m/min, and the speed of the upper pressure roll was increased by 2%.
The speed was set at 10.2m/min.

Next, the decorative board with the masking film is heat-pressed at a linear pressure of 5 kg/cm using a hot pressure roll 9 heated to a surface temperature of 85°C and a support roll 10 to ensure complete adhesion and no peeling due to wrinkles or shrinkage of the film. I got it.

In addition, when the upper and lower pressure rolls 7 and 8 feed the film and decorative board at their respective circumferential speeds, the surfaces of the rolls are made of rubber and have a hardness of about 60 to 85 degrees to improve friction and ensure reliable feeding. Needless to say, it is preferable to do so.

The cutting machine 11 is for cutting the film, and may be of the shearing type, the knife running type, the hot air type in which hot air is blown through slits provided in the width direction to melt and cut the film, or the cutting machine uses hot wire cutting. Also good.

It is widely known that a shearing type or rotary type is suitable for taking out continuous decorative boards as sheets.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention.

Claims (1)

[Claims] 1. A thermoplastic film that becomes adhesive when heated is attached to the surface of a thermosetting resin decorative board such as a leaf-shaped or band-shaped melamine resin decorative board, polyester resin decorative board, diallyl phthalate resin decorative board, benzoguanamine resin decorative board, etc. In the device, the thermoplastic film is brought into contact with the surface of the decorative board using a pressure roll, and when determining the positional relationship between the two,
The circumferential speed of the pressure roll is 0.05 lower than the moving speed of the decorative board.
A thermoplastic masking film pasting device characterized by speeding up the process by ~3%.