JPH02152858A - Film running roller - Google Patents

Abstract

PURPOSE:To prevent a fine scratch on a film surface from occurring in absorbing any dust sticking to a surface-treated plastic film by covering the surface of a metal roll with a knitting seamless cover made up of fibriform yarn. CONSTITUTION:A roll covered with a knitting seamless cover is used as a roll immediately after heat treatment at a surface treatment unit for a plastic film, whereby any film slip is kept back on the roll owing to proper cushionability of knitting cloth and roughness of a contact surface, and yarn's flexibility and a clearance of stitches absorb dust so well, so that any scratch to be produced on the roll due to the slip at time of film running and the dust is fully preventable. Thickness of the yarn used for the seamless cover is desirable to be a range of 0.1-0.3mmphi, and it is also desirable to be such a plain stitch fabric as excellent in flatness and, what is more, thickness of each mesh is desirable to be 5-70 gauges.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a roll for continuously running a surface-treated plastic film.

(Conventional technology) When surface treatment of plastic film is performed continuously,
The film is run through several rolls, but in general, even if the roll surface is finished with good precision, the plastic film expands and contracts, so it is inevitable that small scratches will occur on the film surface. Fields where such minute scratches are a problem include flexible printed circuit boards that form micron-order electrical circuits on plastic films, optical desks that perform optical recording and magneto-optical recording, and optical signal input via films. There are optical communication boards that perform output. In these fields, from several 1O to several 100μ
Even the smallest scratches can be a big problem, so it is desirable to prevent these scratches from occurring.

These scratches mainly occur when the film is running, but to prevent this, measures are taken such as increasing the surface precision of the roll to prevent the film from slipping on the roll.

In addition, in order to provide cushioning properties to the roll surface to prevent slipping and to protect the roll surface, silicone rolls are made by covering metal rolls with cast hollow silicone resin rolls, and Teflon resin is applied to the surface of metal rolls. Used are Teflon baked rolls that are coated and baked at 500 to 600°C, and Teflon shrink tube coated rolls that are made by covering a roll with a Teflon copolymer tube and heating it to about 100'O diameter to shrink the tube and make it tightly coated. It is now possible to do so. As a variation of shrink tube, one with a mesh-like surface is also used.

However, since plastic films expand and contract, especially when heated, they tend to wrinkle or loosen, which causes slips. As countermeasures, we have improved the surface precision of the roll system, applied coatings or shrink tubes to the metal roll surface, devised the shape of the roll, and even used silicone rubber rolls with cushioning properties. It was not possible to completely prevent the occurrence of scratches. Furthermore, a new cause of microscopic scratches has been discovered due to extremely small dust particles adhering to the film moving on the roll, and conventional methods can completely shut out this dust, especially under conditions where heat is applied. I was unable to do so, so I had to solve this problem as well.

(Problems to be Solved by the Invention) The present invention was developed to solve the above-mentioned problems, and is capable of preventing slippage that occurs when a surface-treated plastic film is run, and absorbing dust that adheres to the film. By doing so, a roll residue for film running is provided which prevents minute scratches from occurring on the film surface.

(Means for Solving the Problems) The present invention is a film running roll characterized in that the surface of a metal roll is covered with a knitted seamless cover made of fiber yarn such as cotton or nylon.

The knitted seamless cover used in the present invention is knitted using a circular knitting machine such as a stocking knitting machine or a hosiery knitting machine, and the fabric material is not limited to natural fibers and is soft and resistant to static electricity generation. Synthetic fibers may be used as long as the surface is not slippery. Optimal fabric materials that meet these conditions include natural fibers such as cotton and linen, as well as nylon and polyester treated with antistatic treatment.

In order to achieve the purpose of the present invention, it is necessary to have a cover that has appropriate cushioning properties and also has the ability to absorb dust in order to prevent the film from slipping on the roll. First, it is essential that there be no seams on the rolls, so fabrics knitted on a circular knitting machine are optimal, and using woven fabrics or felt made of various materials is suitable in terms of seams. do not have.

The thickness of the thread used to knit the seamless cover is 0.05
~0.5 mm+lI, preferably 0.1-0.3 mm l (e.g., cotton thread: No. 100~
No. 8, No. 5 synthetic fibers (50 denier to 650 denier) are particularly suitable. The knitted structure is not particularly limited as long as the contact surface is relatively flat, but a plain knitted structure with good flatness is most preferable. The size of the mesh during knitting (number of needles per inch of needle bed) is preferably 5 to 70 gauge. The diameter of the cover made by the above method is
It is preferably 10 to 60% smaller than the diameter of the roll, and the length is 1.1 to 2.0 times longer than the length of the roll to be covered.

Furthermore, if the surface of the roll to be covered is slightly rougher than a mirror surface, it will be easier to fix the attached cover. Of course, depending on the situation, the cover may be fixed to the roll surface using an adhesive. However, the edges of the attached cover must be fixed with tape or adhesive.

(Function) If a roll covered with a seamless cover knitted in the above method is used as a roll immediately after heat treatment in a plastic film surface treatment device, etc., the knitted fabric will have adequate cushioning properties and a rough contact surface. It prevents the film from slipping on the roll, and the flexibility of the threads and the gaps between the stitches absorb dust well, completely preventing scratches on the roll caused by slips and dust when the film is running.

(Example) Example-1 Using 0.2 mm cotton yarn (equivalent to approximately No. 20), knitted in a flat knit structure using a circular knitting machine with a cylinder diameter of 3-1/2 inches and a number of needles of 220 (equivalent to 20 gauge). The diameter of the fabric is 45
A cover with a length of 1600mm and a diameter of 100n++
++, covered with a stainless steel roll having a length of 800 mm. At this time, since the cover was attached in a radially extended state, the length of the cover was approximately halved, and it was firmly fixed to the stainless steel roll, and the lengths of the rolls became approximately equal. The cover was secured to the roll at the edges with heat-resistant tape.

The roll thus produced was used in a heat treatment apparatus for organic coating films, so that the coated surface was in contact with the roll. In this case, the roll angle is 1
It was 90 degrees.

Using this equipment, polyether sal 7 film coated with acrylate resin to a thickness of 3 μm was coated with 12
When the film was heat-treated at 0°C, rolled up, and inspected under a microscope, no minute scratches of about 100 μm were found.

Furthermore, a coating film having a good surface without any fiber debris attached to the surface could be obtained.

Example-2 Using a 0.12mm nylon thread (equivalent to 80 denier) with antistatic treatment on the surface, a cylinder diameter of 3-
A 1/2 (7 inch, 250 needle circular knitting machine (equivalent to 23 gauge)) was used to knit a seamless cover 1,000-knit structure with a fabric diameter of approximately 55 mm and a length of 1600 mm.
Similarly, it was placed on a stainless steel roll with a diameter of 100 mm and a length of 800 mm. This roll was installed in the same position of the same apparatus as in Example-1, and the polyester film was coated with acrylate resin to a thickness of 2 μm, and heat treated at 80°C. At this time, immediately after heat treatment, run the film so that the coated surface is in contact with the seamless cover.

After the film was rolled up, the resin-coated surface was inspected under a microscope, but no problematic minute scratches were found.
A very good surface was obtained.

Comparative Example-1 In the same roll system as in Example-1, when the same film as in Example-1 was used under the same conditions, a roll without a seamless cover was used immediately after heat treatment, and the results were observed under the microscope after treatment. Upon inspection, the film has a rating of 100-20
It was confirmed that many J-shaped scratches with a length of 0μ had occurred on both sides of the 600 mm wide film near both ends. These scratches pose a problem when forming fine electrical wiring circuits on the film.

(Effects of the Invention) As described above, by using the film running roll of the present invention, it has become possible to prevent the occurrence of minute scratches on the resin surface applied to the plastic film.

Claims (1)

[Claims] (1) A film running roll characterized in that the surface of a metal roll is covered with a knitted seamless cover made of fiber yarn such as cotton or nylon.