JPH08232170A - Nonwoven fabric coated with pigment and its production - Google Patents

Abstract

PURPOSE: To obtain nonwoven fabric coated with pigment useful as the cover of a book, a map, an outdoor propaganda poster, a flag, a drop curtain, a label, a tag, other printed materials and prints, having toughness and high resistance to tear, excellent in printability. CONSTITUTION: Nonwoven fabric produced by subjecting a polyolefin resin to flash spinning method is used as a substrate and at least one side of the nonwoven fabric is provided with a coated layer consisting essentially of pigment and an adhesive to give the objective nonwoven fabric coated with pigment having thickness variability, after passing the nonwoven fabric coated with pigment through a pressure nip composed of a metal roll and an elastic roll based on JIS P8,118, of 0.045-0.080mm as difference between the maximum and the minimum among 40 measured parts of thickness. The objective nonwoven fabric is excellent in all evaluations of surface unevenness, surface smoothness, water resistance, printing register and printing double.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to printability and printability of a pigment-coated non-woven fabric, and particularly to book covers, maps, outdoor advertisement posters, flags, banners, labels, luggage tags, other printed matters, printed matters, etc. The present invention relates to a pigment-coated non-woven fabric that is used, is tough, tear-resistant, and has excellent printability and printability.

[0002]

2. Description of the Related Art In recent years, there have been many opportunities to hold various exhibitions, introduce new products, hold events, etc. outdoors using parks and plazas. For example, various publicity posters, flags, banners, etc. are used in outdoor housing exhibition halls, used car center exhibition halls, station front calls for election campaigns, and the like.

[0003] Such materials used outdoors are often cloth sheets because of their excellent weather resistance and resistance to tearing. However, these cloth sheets are very inefficient because they are printed or printed by a special method when printed, and the printed matter is also less clear than the normal method. And since it uses cloth, it is particularly expensive.

As a material for improving the efficiency of printing or printing, which is a clear printed material and which uses an inexpensive material, there are those which are overlaminated on paper, those which use synthetic paper, film, etc. Its strength is weak and it is inferior in practicality.

Japanese Patent Laid-Open No. 3-128231 proposes a coated non-woven fabric. However, according to this method, the original fabric of the non-woven fabric has a two-layer structure, and the non-woven fabric in which a layer having strength and a layer having coating aptitude are combined is used, and the production of the non-woven fabric is complicated.

Japanese Unexamined Patent Publication (Kokai) No. 3-234869 proposes a non-woven fabric for printing, which is provided with an ink fixing layer made of acrylic, rubber, polyester or the like on one surface of the non-woven fabric and can realize a print finish comparable to that of art paper. There is. But,
The product manufactured by this method has poor registerability in an actual printing machine and is liable to cause double marks. Further, since the fibers of the non-woven fabric have unevenness on the surface and the smoothness is poor and there is a problem in the transferability of the printing ink, only the finished printed surface is inferior as a high-quality printed matter.

Japanese Unexamined Patent Publication (Kokai) No. 4-112038 discloses a non-fired clay as a filler on at least one surface of a nonwoven fabric,
A method of applying a composition containing titanium dioxide, calcium carbonate and calcined clay has been proposed. However, this method also has the same drawbacks as described above, and in particular, it has poor registerability in an actual printing machine and is liable to cause fog, which is inferior to a high-quality printed matter.

[0008]

In view of the above circumstances, the present inventors have noticed the non-woven fabric, which is tough and tear-resistant and can be used even outdoors, for high-grade printing and high-grade printing with excellent printability and printability. An attempt was made to obtain a pigment-coated non-woven fabric for use as a base material.

In order to improve the printability and printability of the non-woven fabric, there is a method of applying a coating composition containing a pigment and an adhesive as main components, but the smoothness of the pigment-coated non-woven fabric and the printing in a printing machine. It is necessary to overcome these problems of registration and print debris.

Therefore, in order to improve the smoothness, print registration and printing doublet of the pigment coated non-woven fabric, the present invention allows the surface to be smoothed by passing through a roll pressure nip to reduce the thickness unevenness and to make the non-woven fabric non-woven. The present invention provides a pigment-coated non-woven fabric capable of high-quality printing and high-quality printing by overcoming the above-mentioned drawbacks by reducing the shrinkability of the above.

[0011]

DISCLOSURE OF THE INVENTION The present invention uses a non-woven fabric produced by flash-spinning a polyolefin resin as a support, on which a coating layer containing a pigment and an adhesive as a main component is provided. In the above, as the thickness variation of the pigment-coated non-woven fabric that has passed through a pressure nip composed of a metal roll and an elastic roll after providing a coating layer on at least one side, the maximum and minimum values at 40 thickness measurement points based on JIS P8118 The difference in the value is 0.045 to 0.080 mm, which is a pigment-coated nonwoven fabric.

[0012]

The pigment-coated non-woven fabric of the present invention is tough, tear-resistant, and has excellent printability and printability, and is mainly used for outdoor advertising posters, banners, banners, and other printed matter, and has a high-class advertising use. Used for.

Therefore, the thickness of the pigment-coated nonwoven fabric is obtained by providing a coating layer containing a polyolefin nonwoven fabric as a support, a pigment and an adhesive as main components, and then passing through a pressure nip composed of a metal roll and an elastic roll. The variation is 0.045 ~
It is characterized in that the range is 0.080 mm.

The polyolefin nonwoven fabric is formed by stacking thin and long fibers and joining them by heat and pressure to form a sheet. Therefore, compared to paper or film, the smoothness and texture are poor, and the difference between the thick and thin portions is large. Further, since the flash-spun polyolefin nonwoven fabric has a small apparent specific gravity, the shrinkage after passing through the nip is large in printing, printing, processing and the like.

When the non-woven fabric is provided with a pigment coating layer, the surface smoothness, printability, and printability can be improved to some extent, but the surface roughness and thickness unevenness peculiar to the non-woven fabric, as well as poor printing registration and printing. Overcoming the shortcomings of double debris is inadequate.

For the purpose of overcoming the above-mentioned drawbacks, when the pigment coated non-woven fabric is again passed through the pressure nip used in the non-woven fabric manufacturing process such as a metal roll calender, the smoothness is increased. Due to uneven thickness and expansion and contraction, ruggedness occurs on the surface, and moreover, curling occurs, and a uniform and flat product cannot be obtained.

Generally, when a pigment coating layer is provided on a polyolefin nonwoven fabric, the thickness variation is based on JIS P8118.
The difference between the maximum value and the minimum value excluding the abnormal value of the measured value at 0 points is 0.
The thickness is in the range of 090 to 0.150 mm, and the uniformity depends on how to control this thickness variation.

The inventors of the present invention have used the elastic roll as a pressure nip for the purpose of smoothing and homogenizing the pigment-coated polyolefin nonwoven fabric. Considering the above, high-quality printing was performed with an actual printing machine and printing machine. As a result, it was found that this thickness variation is important in the range of 0.045 to 0.080 mm.

The smaller the thickness variation of the pigment-coated nonwoven fabric of the present invention is, the better it is. When the thickness variation is reduced to less than 0.045 mm, the thickness non-uniformity peculiar to the nonwoven fabric is increased. When passing through the nip, the expansion and contraction becomes non-uniform, and the surface becomes uneven. Also, even if it looks good at first glance,
Dubbing occurs in the printing and printing process. On the other hand, when the thickness variation is more than 0.080 mm and the thickness is not uniform, smoothing and uniformization are insufficient, and misregistration occurs in the printing process, resulting in high-quality prints and prints. I can't.

For smoothing, it is necessary to smooth the entire surface in a unit of a small area to some extent. However, in a pressure nip of a roll having high hardness like both metal rolls, only a thick portion is smoothed. The treated thin portion is not smoothed and the fibrous surface remains as it is, resulting in insufficient smoothing.

The combination pressure nip of the metal roll and the elastic roll can obtain appropriate smoothness and uniform thickness by the pressure deformation of the elastic roll. However, if the hardness of the elastic roll is too low, it becomes insufficient to obtain uniform thickness, and therefore it is necessary to select an appropriate elastic roll hardness.

The hardness of the elastic roll used in the present invention is preferably selected in the range of Shore D hardness of 80 to 95 degrees. If it is less than 80 degrees, the pressurizing condition and the number of passing nips are limited in order to control the thickness variation range to a desired range. On the other hand, if it exceeds 95 degrees, smoothing becomes insufficient.

Further, the polyolefin non-woven fabric has a property that its thickness can be easily changed even by applying a very slight pressure to the roll, and variations in the hardness of the elastic roll itself appear as variations in the thickness of the non-woven fabric, so that there is little variation in hardness of the elastic roll. It is preferable. Examples of the material of the elastic roll include various rubbers such as natural rubber, styrene rubber, chloroprene rubber, chlorotolfonized ethylene rubber, butyl rubber, polysulfide rubber, silicone rubber, fluororubber and urethane rubber. Alternatively, for example, there are various synthetic resins such as aromatic polyamide resin, polyimide resin, polyether resin, polyester resin, polycarbonate resin and the like, or a mixture thereof. In addition, for example cotton, wool,
An elastic roll of fiber or paper such as tetron, nylon or a mixture thereof is appropriately selected and used.

Further, since the pressure nip condition is related to the nip linear pressure, the number of passing nip, the roll temperature, the passing speed, the water content of the pigment coated nonwoven fabric, the environmental humidity, etc., it is natural to appropriately select these. Is. Above all, when the Shore D hardness of the elastic roll is 80 to 95 degrees, the linear pressure is 30 to
120 kg / cm is good. If it is less than 30, sufficient smoothness cannot be obtained, and if it exceeds 120, surface fluffing tends to occur. Then, it is preferable to set the linear pressure as low as possible to increase the number of passing nips.

As a pigment coated non-woven fabric having excellent printability and printability, the smoother smoothness is more correlated with the object of the present invention than the Beck smoothness, and the smoother smoothness is 1 to 20 cm / Hg. Is preferred. If the smoother smoothness exceeds 20, the image becomes unclear even when printed on the coating layer, and the high-grade feeling is insufficient. On the other hand,
It is very difficult to make it less than 1, and at the same time, defects such as distortion in the inside of the pigment-coated nonwoven fabric occur.

The non-woven fabric as the support of the present invention comprises polyolefin flexifilament film fibril strands obtained by flash spinning using polyolefin fibers.

High density polyethylene is particularly preferable as the polyolefin of the synthetic resin constituting the non-woven fabric, but polypropylene, polystyrene or a copolymer of polyolefin, polyester or the like can also be used.

In the flash spinning method, a solution of a low boiling point solvent and a polymer is extruded from a spinning nozzle, the solvent is instantaneously vaporized and evaporated to obtain a very thin and high-strength filament, and the filament is blown onto a belt conveyor. A non-woven fabric is manufactured by joining the materials at a fusion point through a hot calender roll.

This flash-spun non-woven fabric has a higher degree of crystallinity than other non-woven fabrics, for example, a non-woven fabric formed by a melt blow method using a heating jet or a spunbond method using a compressed air flow. It is high and has excellent characteristics such as durability, water resistance and toughness required for sheet materials.

The basis weight of the nonwoven fabric of the present invention is 35 to 200 g /
m ² , more preferably about 40 to 150 g / m ² . It is difficult to handle a very thin sheet having a weight of less than 35 g / m ² . And when it exceeds 200 g / m ² , it becomes too rigid.

The coating composition containing a pigment and an adhesive as a main component, which is used for a layer for direct printing or the like in the case of a single layer or an uppermost layer of a plurality of layers of the present invention, is coated as an aqueous coating liquid, its coating weight, 5 to 60 g / m ² in general per side, is preferably adjusted in the range of 8~50g / m ^2. If the amount is too small, such as less than 5 g / m ^2, the sharpness effect of printing or printing images cannot be obtained, and if the coating amount is more than 60 g / m ² , the coating layer may fall off due to bending. .

The pigment used in the present invention is not particularly limited and may be appropriately selected and blended from inorganic or organic white or colored pigments generally used in aqueous coating compositions. Further, the adhesive can be appropriately selected and mixed from the adhesives generally used in the aqueous coating composition.

In order to spread the use of the pigment-coated non-woven fabric of the present invention, it is preferable to use an all-weather type. In order to make it weatherproof, it is necessary to strengthen the adhesive strength and water resistance of the pigment coating layer, and synthetic resin latex and epoxy resin are particularly used as the preferable adhesive constituting the coating layer. Further, the aqueous coating liquid of the present invention can be appropriately selected and blended from the adhesives and auxiliaries generally used in the aqueous coating composition, if necessary.

As the synthetic resin latex preferably used in the present invention, for example, a conjugated diene polymer latex, an acrylic polymer latex, a vinyl polymer latex, and a functional group such as a carboxyl group are introduced into these various polymers. The latex which was made is mentioned.

The epoxy resin preferably used in the present invention is a water-soluble epoxy compound which is a compound having two or more highly reactive epoxy groups in the molecule and is produced by glycidylation of epichlorohydrin. .

The preferable amounts of the synthetic resin latex and the epoxy resin used are appropriately adjusted depending on the kind of each, but 2 to 5 parts by weight of the synthetic resin latex is added to 100 parts by weight of the pigment constituting the coating layer. In the range of about 45 parts by weight, more preferably 5 to 30 parts by weight, when the epoxy resin is less than 1, the water resistance effect is insufficient, and when it exceeds 20, the coating layer tends to be hard and the bending strength tends to be low. The range is about 20 parts by weight. If the total amount of the adhesive exceeds 50 parts by weight, the ink absorbency becomes too slow, and therefore it is preferable to take this point into consideration when making the determination.

The coating machine and finishing machine used in the present invention are not particularly limited, and may be selected from commonly used coating machines, dryers, finishing machines and other auxiliary equipment. It is also possible to carry out post-processing to give an adhesive product or the like. Further, the printing method and the printing method are not particularly limited, and commonly used printers, copying machines, printing machines, light printing machines, thermal transfer machines, etc. are used, and well-known techniques are used according to their suitability. You can also apply special coating.

[0038]

The present invention will be more specifically described with reference to the following examples, but the present invention is not limited to these examples. In addition,% and part in an example respectively show the weight% weight part of dry solid content.

Example 1 [Support] As a support, a high-density polyethylene fiber non-woven fabric (trade name: Tyvek 1073D, manufactured by DuPont) manufactured by a flash spinning method with a basis weight of 75 g / m ² is used. [Coating liquid] Kaolin (trade name; UW-9) as a coating liquid
0, manufactured by EMC) 50 parts, light calcium carbonate (trade name; Tamapearl TP-123CS, manufactured by Okutama Industry Co., Ltd.) 5
0.3 part of sodium polyacrylate was added to 0 part and dispersed by a stirrer to prepare a pigment slurry having a solid content concentration of 65%. Copolymer latex containing methylmethacrylate-butadiene as a main component in the pigment slurry as a solid component (trade name: P-OX55P, manufactured by Sumitomo Dow) 2
3 parts, epoxy resin (trade name; PC-1000, manufactured by Nagase Kasei Co., Ltd.) 4 parts, antistatic agent 3 parts, ammonium zirconium carbonate 2 parts, other auxiliaries and water are added, and solid content concentration 5
The coating liquid was prepared so as to be 0%. [Coating] The above coating liquid is coated on one surface of the above non-woven fabric with a bar coater so that the dry weight is 20 g / m ^2, and dried for 30 seconds with a hot air dryer at 60 ° C. The same coating solution was coated on the above in a dry weight of 20 g / m ^{2 and} dried at 60 ° C. for 30 seconds to perform double coating on one side. [Smoothing] Subsequently, a normal pressure elastic roll having a roll diameter of 400 mm and a Shore D hardness of 85 is provided on the upper and lower sides and a metal nip having a roll diameter of 300 mm between the upper and lower rolls. 150 m / m
In, the coated surface was passed through 2 nips so as to be in contact with a metal roll, the paper surface temperature after passing was controlled to 40 ° C. or less, and smoothing treatment was performed to prepare a pigment-coated nonwoven fabric.

Example 2 In Example 1, the linear pressure of the pressure nip was 100 kg / c.
A pigment-coated nonwoven fabric was prepared in the same manner as in Example 1 except that m was changed.

Example 3 A pigment-coated nonwoven fabric was prepared in the same manner as in Example 1, except that the single-sided double coating was applied to the single-sided single coating.

Comparative Example 1 A pigment-coated nonwoven fabric was prepared in the same manner as in Example 1 except that the smoothing treatment was not performed.

Comparative Example 2 In Example 1, the linear pressure of the pressure nip was set to 20 kg / cm.
A pigment-coated nonwoven fabric was prepared in the same manner as in Example 1 except that the above was used.

Comparative Example 3 In Example 1, the linear pressure of the pressure nip was 150 kg / c.
A pigment-coated nonwoven fabric was prepared in the same manner as in Example 1 except that m was changed.

Example 4 A pigment-coated nonwoven fabric was prepared in the same manner as in Example 1 except that the basis weight of the support was changed to 55 g / m ² (trade name: Tyvek 1056D, manufactured by DuPont).

Example 5 In Example 1, the basis weight of the support was 110 g / m 2.
^A pigment-coated nonwoven fabric was prepared in the same manner as in Example 1 except that ² (trade name: Tyvek 1085D, manufactured by DuPont) was used.

Example 6 Example 6 is the same as Example 1 except that the single-sided double coating was a double-sided coating with double-sided coating, and the surface to be the surface was applied to a metal roll for smoothing. A pigment-coated nonwoven fabric was prepared in the same manner as in 1.

Example 7 In Example 1, the adhesive of the coating liquid was 18 parts of methyl methacrylate-butadiene copolymer latex, polyvinyl alcohol (trade name; PVA105, manufactured by Kuraray Co., Ltd.).
A pigment-coated non-woven fabric was prepared in the same manner as in Example 1 except that the parts were omitted.

Example 8 A pigment coated non-woven fabric was prepared in the same manner as in Example 1 except that the elastic roll was a woolen paper elastic roll having a Shore D hardness of 75.

Example 9 Example 1 is different from Example 1 except that the elastic roll is a polyether synthetic resin elastic roll having a Shore D hardness of 91.
A pigment-coated nonwoven fabric was prepared in the same manner as in (1).

The pigment-coated nonwoven fabrics of Examples and Comparative Examples were evaluated by the following evaluation methods, and the results are shown in Table 1. [Thickness variation of pigment-coated nonwoven fabric] The thickness of the pigment-coated nonwoven fabric was measured at 40 measurement points according to JIS P8118, and the difference between the maximum value and the minimum value was taken as the thickness variation except for abnormal values. The smaller the value, the smaller the variation. (Unit: m
m) [Bobping of pigment-coated nonwoven fabric] The pigment-coated nonwoven fabric was placed on a flat surface and visually judged. ○ It is good with almost no flicker. × Puzzling is noticeable and there is a problem in practical use. [Surface Smoothness of Pigment Coated Nonwoven Fabric] The smoothed surface of the coated metal roll of the pigment coated nonwoven fabric was measured with a smoother smoothness meter (manufactured by Toei Denshi Kogyo KK). The smaller the value, the better the smoothness. (Unit: cmHg) [Water resistance of non-woven fabric coated with pigment] After the non-woven fabric coated with pigment was immersed in water at room temperature for 24 hours, the coated surface of the fingertip was rubbed 10 times to determine the falling state of the coated layer. ○ The coated layer does not fall off. Δ There is a problem in practical use in applications where the coating layer is slightly removed and water resistance is required for a long period of time. [Printing Orientation of Pigment-Coated Nonwoven Fabric] A pigment-coated non-woven fabric is smeared with an offset four-color printing machine (Mitsubishi Diamond 4E-4) using sheet offset ink (P0P-K, manufactured by Dainippon Ink and Chemicals, Inc.) Then, printing was performed on the coated surface in the order of, eye, veneer, and key, and the misregistration of each color of the printing mark was judged. ○ It is good with the same degree of misregistration as commercial coated paper. × The misregistration of each color is terrible, which is a practical problem.

[Print Doublet on Pigment Coated Nonwoven Fabric] Printing was performed at the same time as the printing register and the judgment was performed using a signal strip of a Bruner system. ○ It is as good as commercial coated paper. △ There is a slight amount of debris and the quality is inferior. × Debris is severely problematic in practical use.

[0053]

[Table 1]

[0054]

As shown in Table 1, the results of the examples show that the pigment-coated nonwoven fabric of the present invention has excellent quality in all of the evaluations of surface roughness, smoothness, water resistance, printing registration, and printing doublet. It had characteristics.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Junichiro Tanaka 4-3-1, Jokoji, Amakozaki City, Hyogo Prefecture Kanzaki Paper Co., Ltd. Kanzaki Mill

Claims (4)

[Claims] 1. A pigment-coated non-woven fabric comprising a non-woven fabric produced by flash-spinning a polyolefin resin as a support, and a coating layer comprising a pigment and an adhesive as a main component provided thereon.
Thickness variation of pigment-coated non-woven fabric that has been coated on at least one side and then passed through a pressure nip composed of a metal roll and an elastic roll (thickness measurement based on JIS P8118 40
The difference between the maximum value and the minimum value of the place) is 0.045 to 0.080
mm, a non-woven fabric coated with a pigment. 2. The smoother smoothness of the surface is 1 to 20 cm.
The pigment-coated nonwoven fabric according to claim 1, which is Hg. 3. The pigment-coated nonwoven fabric according to claim 1, wherein the adhesive of the coating layer contains a synthetic resin latex and an epoxy resin. 4. A Shore D hardness of an elastic roll (ASTM D-224
0) is 80 to 95 degrees and the linear pressure of the pressure nip is 30 to 12
It is 0 kg / cm, The manufacturing method of the pigment coated nonwoven fabric of Claims 1-3.