JPS61162449A - Method of cutting or winding resin film - Google Patents

Abstract

PURPOSE:To enable excellent holding of transition of printing ink, by a method wherein a resin film, on the surface of which an antistatic agent is coated, is wound or cut to accumulate the cut films in a sheetlike manner for storage under atmosphere with relative humidity of 50% or more at 20-45 deg.C. CONSTITUTION:A resin film A, on the surface of which a resin layer of an antistatic agent polymer is formed, is fed from the air curtain 4 side in a room 3 under atmosphere with a temperature of 20-45 deg.C and relative humidity of 50% or more, preferably 55-80% through the working of a temperature regulator 1 and an air conditioner 2 having two functions of heating and cooling functions. The film is cut in the shape of a sheet 6 by means of knives 5 and the sheets are accumulated and packed. By delivering the film in a manner described above, transition of printing ink is improved, and this eliminates test printing by which it is tested whether printing properties of the stored resin film is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The resin film (including synthetic paper) obtained by the method of the present invention has excellent printability in offset printing, gravure printing, etc. even in low temperature and low humidity conditions in winter. Excellent in

This printed resin film is useful as posters, packaging films, and decorative paper.

[Prior art]

On the surface of the thermoplastic resin film, polyethyleneimine,
Water-soluble antistatic agents such as ethyleneimine adducts of polyamine polyamides, quaternary nitrogen-containing acrylic polymers, acrylamide polymers, and ethyleneimine-ethylene urea copolymers are applied and dried to improve the printability of resin films. It is known to do so (@Koshō 53-6676
No. 57-48578, No. 52-30390, No. 59-27770, JP-A-48-96664).

These resin films having the antistatic polymer resin 14 provided on their surfaces have excellent gravure printing, flexographic printing, and offset printing properties.

However, printing manufacturers have pointed out that while there are no problems in spring, summer, and autumn, printing ink is difficult to transfer to resin films in winter, when the temperature is low and the humidity is low. To deal with this, we have rolled up a resin film or cut it into a sheet after molding.
In reality, this problem can be solved by storing the stacked resin film in a room at a temperature of 35° C. to 45° C. for 3 weeks to 1 month.

[Problem that the invention seeks to solve]

By storing the sheet as described above, the entire surface of the sheet is humidified to the same conditions as the atmosphere, which improves the transfer of printing ink, but not only is special storage equipment required for long-term storage under such conditions, but the stored resin This is inconvenient because it is necessary to make a trial print to check whether the film has good printability.

[Specific measures to solve the problem]

In the present invention, by controlling the temperature and humidity conditions when winding and straddling the resin film, cutting the resin film into sheets, soaking and packaging, the resin film can be immediately shipped and printed. The present invention provides a resin film with good transfer of printing ink.

That is, in the present invention, a resin film coated with an antistatic agent on the surface is rolled or cut in an atmosphere at a temperature of 20 to 45°C and a relative humidity of 501 or more, stacked in a sheet form, and then stored. The present invention provides a method for cutting or winding a non-woven film, which is characterized by the following.

Examples of the ls resin film include films made of thermoplastic resins such as polypropylene, polyethylene, polyethylene terephthalate, polyamide, polystyrene, polyvinyl chloride, and polycarbonate, and films made of stretched films.

This resin film contains calcium carbonate, clay, talc,
It contains fillers such as titanium oxide, heat stabilizers, lubricants, dispersants, etc., and antistatic agents to be applied to the surface of the resin film include polyethylene imine and polyamine amide described in the above-mentioned publications. Examples include ethyleneimine adducts of polyamine polyamides, epichlorohydrin adducts of polyamine polyamides, #c12g class i element-containing acrylic polymers, acrylamide polymers, ethylene-ethylene i element copolymers, and the like. These are 5T-iooo and 5T-1100 from Mitsubishi Yuka Fine ■.
, 5T-1200, 8T-1300, S'l'-300
It is sold under the trade name 0, Yomyopolymin SN by BAaF, and Kaimen 557H by Deip Hercules.

These water-soluble antistatic polymers have a solution concentration of 0.5
The resin solid content is 0.01 by applying means such as roll, spray, or brush as an aqueous solution of ~3 weight.
~x, of/n? It is applied and dried.

A resin layer of antistatic agent is provided on the surface of the Kukan resin film, and as shown in Figure 1, it has a humidity regulator (1, 1...) that performs humidification or dehumidification, and has both heating and cooling functions. The air is supplied into the room (3) equipped with air conditioning equipment (2, 2...) from the air curtain (4) side, cut into sheets (6) by knives (5, 5), and stacked. and then packaged. Room in the factory building (3)
The upper and side walls of A, excluding the air curtain (4) side, are covered with heat insulating materials, glass plates, resin films, etc. (7, 7...
) is isolated from the outside air, and the temperature and humidity inside (3) are adjusted efficiently.

Figure 1 describes an example of cutting and packaging into sheets, but
When shipping the film in rolls, use a knife (5
, 5), a winder is used instead.

The temperature and relative humidity inside the chamber (3) are 20-45℃, so
Adjustments (1, 1, . . .) and air conditioners (2, 2, . If this condition is removed and the film is cut, stacked and packaged, or the film is rolled and shipped,
Printing ink transfers poorly to the film surface.

This is what happens when cutting or slitting film! [Especially in the winter, the environmental conditions often fall outside of the above conditions, and the transfer of printing ink often becomes poor, especially in the winter.

In the present invention, it is presumed that by actively adjusting the conditions of the air that comes into contact with the sheet, the antistatic agent layer is raised and lowered, and the surface condition is changed to be suitable for offset printing.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 (1) Polypropylene 80 with a melt index (MI>0.8) was continuously mixed with 20 g of calcium carbonate with an average particle size of 1.5 microns (A), and an extruder was set at 270°C. After mixing, it was extruded into a sheet and cooled with a cooling device to obtain a non-stretched sheet.

This sheet was heated to 145°C and then stretched 5 times in the machine direction.

(2) A mixture of 50% by weight of Bo11 propylene with MI 4.0 and 50% by weight of calcium carbonate powder (F4 and
A mixture of 50% MI4.0 polypropylene, 8% high density polyethylene, and 42% calcium carbonate (
q and melted at 270℃ using separate extruders.
After kneading, then supplying each to one die and laminating in the die, the longitudinal direction 5 obtained in the above (1)
Both sides of the double-stretched sheet were coextruded so that II (Q was on the outside).Then, this five-layer laminate was heated to 185°C and then stretched 7.5 times in the transverse direction. obtained the film.

(3) The front and back surfaces of this five-layer laminated film were subjected to corona discharge treatment, and the thickness of each film of (Q / (Bl / Cap / (E) / (Q) was 3 / 17 / 40 / 17 / 3 microns. A synthetic paper with a five-layer structure was obtained.

A coating agent aqueous solution having the composition shown in Table 1 was applied to the front and back surfaces of this synthetic paper at a solid content of 0.05 f/n? After nine coats,
It was dried in a partial layer adjusted to 30° C. and a relative temperature of about 70%, and cut into sheets in the same layer to produce synthetic paper for printing.

Toyo Ink Manufacturing's offset printing ink "TSP-4"
Using a 00° (product name) and a 4-color offset printing machine manufactured by Komori Printing Co., Ltd., we performed 4-color (black, blue, red, yellow) offset printing on the front side of synthetic paper that had been stacked and stored for one day. The transferability of the ink, the adhesion of the ink, the continuous offset printing performance, and the paper feeding/discharging performance of the synthetic paper were evaluated using the following methods. Table 1 shows the results.
Shown below.

The temperature inside the factory was 12°C and 3°C, and the relative humidity was 424°C.

The printing performance was similarly evaluated for synthetic paper stored at room temperature for 10 days and 1 month after cutting. [Ink transferability] The halftone dots of each color were enlarged @ (30x). It was enlarged and the halftone reproducibility was visually judged.

Halftone reproduction s: 100-754 good IQ 175-50
96 Slightly poor (Δ) 50~O Poor (×) [Ink adhesion] Nichiban ■Yiku Blue Tape 1 Stick cellophane tape (trade name) firmly onto the printed surface, and quickly peel it off along the printed surface.
The degree of detachment of the ink from the paper surface, If, was visually determined.

Ink residual rate: 100~954 good (○) 95~
80 Slightly poor (Δ) 80-04 Poor fXl [Offset continuous printing properties] 500 sheets were printed continuously, and the ink edge pile on the blanket and the blanket whiteness were compared with the state before printing.

In addition, for the printed matter, the halftone dot reproducibility was visually determined by comparing the printed matter immediately after printing started and that after continuous printing.

Blanket-like! l: Same as before printing (01 Slightly different (Δ1 Largely different (x) Examples 2-3, Comparative Examples 1-3 The conditions in the room during cutting and the antistatic agent composition were changed as in 1) The offset printability of the synthetic paper obtained was evaluated in the same manner as in Example 3 except for the following steps.

The results are shown in Table 1.

The components of the antistatic agent are as follows.

(a) Water-soluble polyacrylic anti-static polymer rsT-11002 manufactured by Mitsubishi Yukasha Co., Ltd. (b) Ethyleneimine addition of polyamine bollium amide* (Nashiborimin SN, manufactured by BASF Co., Ltd.) (C) Epichlorohydrin adduct of water-soluble polyamine polyamide (Dick) 1-Cymen 557HJ manufactured by Kyrus Co., Ltd. (margins below C) Example 4 Instead of cutting synthetic paper, roll it up and
It was evaluated in the same manner as in Example 1, except that it was stored at 0° C. for one day, rewound and applied with an offset mark 1.

The offset printability of the synthetic paper was equivalent to that of Example 1.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an apparatus implementing the invention. In the figure, the person is an antistatic agent coated resin film, 1 is a honey regulator, 2 is an air conditioner, 3 is a room, 4 is an air curtain,
It is a 5-knife.

Claims (1)

[Claims] 1) A resin film coated with an antistatic agent on the surface of 20
1. A method for cutting or winding a resin film, which comprises winding or cutting in an atmosphere at a temperature of ~45° C. and a relative humidity of 50% or more, or cutting and stacking into sheets, and then storing. 2) The method according to claim 1, wherein the antistatic agent is a quaternary nitrogen atom-containing acrylic polymer or polyethyleneimine.