JPS62273070A - Apparatus for forming film to surface of plastic film or sheet moving continuously at ultrahigh speed - Google Patents

Abstract

PURPOSE:To form a uniform film at an ultrahigh speed, by supplying a coating solution from the center of a coating roll under liquid pressure and providing speed difference between the peripheral speed of the coating roll and the moving speed of a body to be coated. CONSTITUTION:One or two coating roll is used corresponding to the single surface or both surfaces of a plastic film or sheet. The coating solution such as the antistatic agent or anti-fogging agent solution supplied to the shaft pipe 4 in the coating roll 3 is exuded to the surface of the roll 3 from the small holes 5 of the shaft pipe 4 through a coating material 6 comprising a nonwoven fabric or an open cell foam material to be applied to the surface of an object to be coated moving at an ultrahigh speed. At this time, if the moving speed of the object to be coated is set so as to be faster than the peripheral speed of the coating roll 3, sliding action is generated between both of them and the coating solution is leveled. Thereafter, the coated object passes an adjusting roll to make the thickness of the coating layer uniform and dried to form a film.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Field of Application] The present invention is directed to the application of an antistatic agent or an antifogging agent solution to the surface of a plastic film or sheet such as a magnetic tape or a packaging film. This relates to a device that forms a coating film by applying it at an ultra-high speed.

[Prior art and its problems] ``Plastic products such as magnetic tapes and packaging films have the drawback of being charged with static electricity and becoming cloudy due to water vapor adhering to the surface. Efforts have been made to eliminate defects by applying a chemical to the surface.

A well-known coating method is a method in which a coating liquid is transferred to a transfer plate using a gravure roll method when printing or dry laminating a plastic film.

However, with this coating method, it is difficult to maintain a constant coating thickness when coating at a high speed of about 100 m/win or more.
There is a drawback that coating itself is impossible at a speed of about 200 m/win.

For this reason, a problem has arisen in that antistatic agents and antifogging agents cannot be applied simultaneously in accordance with recent high-speed printing or dry lamination.

[Object of the present invention] An object of the present invention is to propose an apparatus capable of forming a uniform coating film on the surface of a plastic film or sheet that moves at ultrahigh speed.

[Configuration of the present invention] The configuration of the present invention is as follows.

A coating roll formed by coating a coating material around a shaft pipe provided with many small holes, a liquid supply device for pressurizing a coating liquid into the shaft pipe, and a coating film adjustment disposed next to the coating roll. Continuously moving at ultra-high speed, consisting of a roll and a drive device that rotates the coating roll in the moving direction of the coated body while setting the peripheral speed of the coating roll to be slower than the moving speed of the coated body. A device that forms a coating film on the surface of a plastic film or sheet.

In the above device, when coating only one surface of the plastic film, use a coating roll that contacts only this surface, and when coating both surfaces, use two coating rolls that touch each surface. .

The coating liquid supplied to the shaft pipe inside the coating roll oozes out onto the surface of the roll through the coating material made of nonwoven fabric or open cell material through the small holes in the shaft pipe, and the object to be coated moves at ultra-high speed. applied to the surface of At this time, since the moving speed of the object to be coated is faster than the circumferential speed of the coating roll, a sliding action occurs between the two and the coating liquid is leveled. The coated object that has been coated in this way is then moved through an adjustment roll to have a uniform coating thickness, and is then dried in a drying device to form a coating film on its surface. Ru.

[Example] Figure 1 shows an example of the present invention, where l is an object to be coated, 2 is a guide roll, and 3.3a is a coating roll, and this coating roll 3.3a is shown in Figures 2 and 3. As shown, a shaft pipe 4 with many small holes 5 is inserted into the center of a coating material 6 having a circular cross section, and a storage tank and a pump are used to supply the coating liquid mainly through a conduit 7 into the shaft pipe 4. The coating liquid is fed under pressure from a supply device (not shown). Note that the coating material 6 is preferably a nonwoven fabric such as felt or an open cell material.

Further, the application rolls 3, 3a are rotated in the moving direction of the object 1 to be coated by a drive device (not shown) mainly consisting of a motor and a speed reducer. This rotational speed is such that strong centrifugal force does not act on the coating liquid and cause it to scatter or cause a large effect on seepage.

Reference numeral 8.8a denotes a coating film adjustment roll (trade name "Massroll") made of a material with liquid retention properties, and the circumferential speed of this adjustment roll is the same as that of the object 1 to be coated.

9.9a is a drying device through which the object 1 to be coated passes, and hot air at 70° C. is circulated inside.

Next, an example of applying an antistatic agent using the above-mentioned apparatus will be described.

& 9i ai body l is polyester film (3
The purpose is to perform antistatic treatment on one side.

Moving speed of object to be coated: 150 m/win250
m+/j+ir+ During treatment of object to be coated: Circumferential speed of 30C coating roll: 1 m/sin Antistatic treatment liquid: Antistatic agent 0.5z ethanol solution Antistatic treatment liquid consumption: 90cc/sin/150
m/5in (0,8cc/m) 130cc/win/250m/5in (0,52cc
/5in) The coated object 1 whose surface was treated under the above conditions was dried in a drying device 9.9.
There is no uneven application or stickiness when the product comes out of a.
The charging voltage was 150 V and the total decay time was 1 second with respect to the applied voltage of 10 KV. Also, for the applied voltage of 5KV, the charging voltage is 3
The voltage was 0V and the total decay time was 0.75 seconds.

[Effects of the present invention] In the present invention, as described in 1 below, the coating liquid is supplied to the coating roll from the center of the coating roll using hydraulic pressure.
The coating liquid can be supplied continuously under substantially the same conditions, and by slowing down the rotation speed of the coating roll, the coating liquid will not be scattered around or excessively discharged due to centrifugal force.

In addition, in the present invention, a speed difference is provided between the circumferential speed of the coating roll and the moving speed of the object to be coated to cause a sliding action on the contacting surface, so that the coating liquid is uniformly distributed due to this sliding action. and even out.

Next, in the present invention, by applying an adjustment roll to the surface coated as described above, the amount of the coating liquid can be adjusted here, so that a predetermined coating film can be formed.

Therefore, according to the present invention, various surface treatments can be performed at ultra-high speeds of about 250 m/sin, so surface treatments can be performed in combination with a printing machine or a dry laminator, dramatically improving surface treatment capabilities. be able to.

[Brief explanation of the drawing]

FIG. 1 is an overall view of the apparatus according to the present invention, FIG. 2 is a sectional view of a coating roll, and FIG. 3 is a sectional view taken along line A--A. 1...THi body to be coated, 3.3a...
...Application roll, 4...Shaft pipe,
5...Small hole. 6... Coating material, 8.8a...
Adjustment roll 9.9a...Drying equipment procedural amendment (voluntary) September 16, 1988 Commissioner of the Japan Patent Office Kuro°1) Akio Yu 1, 'JS indication patent application 1986-1143B9 l Utsugi 2, Name of the invention Apparatus for forming a coating film on the surface of a plastic film or sheet that moves continuously at ultra-high speed 3, Relationship with the person making the amendment case Applicant: 1-9 Nihonbashi Honmachi, Chuo-ku, Tokyo, Ltd. Finetic Research Institute Representative Hiroharu Hayashi 4, Agent 5-73-2 Honkomagome, Bunkyo-ku, Tokyo Detailed description of the invention column J, I, J・′・＼ 8, Contents of amendment The 6th to 7th lines from the top of page 5 of the specification, ``...is in good condition. Also, this applicator roll 3.3a...'' has been replaced with ``.
...It is in good condition. C. 5 is pipe 4, and this applicator roll 3.3a is..." I am corrected.

Claims (1)

[Scope of Claims] 1. A coating roll formed by coating a coating material around a shaft pipe provided with many small holes, a liquid supply device for pressurizing a coating liquid into the shaft pipe, and a coating roll of the coating roll. a coating film adjusting roll disposed next, and a drive device that rotates the coating roll in the moving direction of the coating object while setting the circumferential speed of the coating roll to be slower than the moving speed of the coating substrate; A device that forms a coating film on the surface of a plastic film or sheet that moves continuously at ultra-high speed. 2. Forming a coating film on the surface of a plastic film or sheet that moves continuously at an ultra-high speed according to claim 1, which comprises a drying device for drying the object to be coated next to the adjusting roll. device to do.