JPS62250300A - Polyester base paper for printing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to one-time management paper used in assembly plants where there is a risk of water or oil splashing, adhesive label paper for high-speed printing,
This product relates to polyester base paper for printing, which is used for outdoor leisure paper such as golf scorecards and ski lift tickets.

<Prior art> Label paper for high-speed printing with a printing speed exceeding 10,000 lines per minute is almost unknown until now (only some film-based synthetic paper) 7 Latest high-speed printing using laser beams and computer technology There is a strong demand for machines to imprint data, addresses, names, etc. on labels.

Label paper other than film-based paper that can withstand high temperature (approximately 200° C.) and high pressure conditions in addition to high speed has not yet been found.

Current synthetic paper for high-speed printers with Pace K, such as polyester film, absorbs and dries the ink (or carbon toner) onto the paper surface slowly when printing. ) stains occur.

On the other hand, when coating non-woven fabric Kmm, this contamination causes coating spots, making long-term continuous production difficult.
At the same time, the quality (homogeneity) of the product is extremely reduced.

In order to prevent resin bleed through nonwoven fabrics, calendering is performed at high temperatures and high pressures to extremely increase the bulk density, which in turn reduces the liquid transportability of the resin and causes "surface flow."

This phenomenon occurs on natural valve paper and rayon paper.

This is a particularly serious problem with polyester paper, which is extremely hydrophobic, unlike nylon paper and vinylon paper.

To prevent bleed-out, the coating speed should be adjusted to Iom/m.
There are methods of extremely lowering it to around 100% or applying sealing to the sheet before resin coating, but both methods are not preferred as they significantly reduce productivity.

<Purpose of the invention> In view of the current situation, the present invention solves the problem of resin bleed-through.

The purpose of this invention is to provide a polyester base paper for printing that is free from ink stains and has excellent high-speed printing properties.

<Structure of the invention> That is, the present invention.

"Polyester base paper for printing, consisting of short polyester fibers with a single filament fineness of 0.01-2o denier, having a basis weight of 40-801/lr? and a bulk density of 0.40-0.7017cd" It is.

The denier of the polyester short fibers used is 2. Ode
The following are preferred. 2. If Ode is exceeded, the density of the fibers constituting the paper decreases, so that bleed-through occurs even if the bulk density is set within the range of the present invention. Below 0.01 d・,
The production of fibers becomes technically difficult and loses its practicality from an industrial perspective.

The fiber length of polyester short fibers is 1.0 to 30.0 M
is preferred. If it is less than 1.0 m, the mechanical strength of the paper will be poor, and if it exceeds 30.0 U, the dispersibility of the fibers in water will be insufficient during wet-process nonwoven fabric production, making it difficult to obtain a homogeneous paper.

Basis weight is 40~Bog/rr? It is. If it is less than 40 g/-, the resin will bleed through during coating, staining the guide roller of the coating machine and causing Twotig spots, making continuous production difficult.

If it exceeds 5 olltd, the base paper becomes coarse and hard and loses its practical feel.

Bulk density ranges from 0.40 to 0.70 fi/cd. Bulk density is a value obtained by dividing the basis weight by the thickness of synthetic paper. If it is less than 0.40.9/d, resin bleed through during coating will occur.

If it exceeds o, rofi/cd, the resin will flow on the coated surface, making it difficult to uniformly coat the synthetic paper.

The bulk density can be adjusted mainly by changing the conditions when calendering a web produced by a paper machine, or by changing the blending ratio of raw cotton having different birefringence.

Typically metal/metal roll calender.

It is preferable to use a metal/cotton roll calender or the like under the conditions of a metal roll heating temperature of 160 to 235° C., a linear pressure of 5 to 100, and 9/1 Mt.

Conventionally known methods may be used to produce the base paper, but a wet method is preferred, in which short polyester fibers are dispersed in water and then a kuep is formed using a circular mesh, short mesh or Fourdrinier paper machine.

<Effect of the invention> The present invention has the following effects.

There is no resin bleed through. Furthermore, since the resin has good permeability into the inner layer of the base paper, no resin flow occurs on the surface.

(2) Since there is no resin bleed through, continuous production of printing base paper (long-term continuous coating) is now possible.

(3) Excellent surface smoothness provides extremely good printability and printability. Also, compared to film-based synthetic paper, resin can penetrate into the inner layer of the base paper, so the amount of coating can be increased.
Since the amount of white pigment (talc, titanium oxide, calcium carbonate, etc.) that is usually added together with the resin can be increased, the hiding power of the printing base paper can be improved.

(4) When an antistatic agent is added to the resin, the antistatic agent is also impregnated into the inner layer of the base paper, so that the antistatic properties of the printing paper can be maintained for a long period of time. Therefore, during use, there is no problem of the printing paper becoming darkened due to absorption of dust in the air.

<Example> The method for manufacturing printing paper of the present invention will be described below with reference to Examples. In the examples, t* or part means weight t* or part by weight, respectively. The evaluation method was as follows.

(1) Surface coating uniformity: White gradient-containing acrylic acid ester copolymer was coated on one side of cut base paper.

Next, lightly scrape off the footing surface with a knife coater to apply the emulsion to approximately 80 degrees. I/W?
(wet pace). Another 120
After drying with hot air by hanging vertically at ℃ for 2 minutes, the distribution of white pigment on the sheet surface was evaluated.

(2) Penetration: This was determined by observing whether or not the white pigment penetrated to the back side of the A4 size test piece used to judge the above-mentioned surface coat uniformity.

Examples 1-4. Comparative Examples 1 and 2 Single yarn denier 0.5 det tlj, wire length 5. Oiw
(birefringence Δn0.133) 60 parts of polyethylene terephthalate short fibers and single yarn denier 1.1 de fiber length 5.
After dispersing 40 parts of polyethylene terephthalate short fibers of 0■ (Δn: 0.008) in water, paper was made using a cylinder paper machine, and the basis weight was szl/n? got the web. Finally, a metal/cotton roll type calendered sheet with a bulk density of 100% was obtained. (Examples 1-4° Comparative Examples 1-2).

The surface coating uniformity and backing properties of the obtained sheets were measured. The results are shown in Table 1.

Table 1 Comparative Examples 3 to 5 Single yarn denier 2.5 de fiber length s, om (Δn: 0.1
34) polyethylene terephthalate short edge 860%, single yarn denier 1.1de fiber length 5.0cm (Δn: o, 0
The same procedure as in Example 1 was carried out except that 40 parts of polyethylene terephthalate short fibers (No. 08) were used.

The evaluation results are shown in Table 2.

Table 2 Examples 5-6. Comparative Example 6 Single yarn denier 1.5 de fiber length 5.0 m (Δn; 0.1
30) with 92.6 mol% of 5-sodium sulfoisophthalate and 65 parts of polyethylene terephthalate short fibers, single yarn denier 1.1 d, fiber length 5.0 m (Δn: 0
．． The same procedure as in Example 1 was carried out except that 35 parts of polyethylene terephthalate short fibers (008) were used. The evaluation results are shown in Table 3.

Table 3

Claims (1)

[Claims] It is made of short polyester fibers with a single filament fineness of 0.01 to 2.0 denier, has a basis weight of 40 to 80 g/m^2, and a bulk density of 0.40 to 0.70 g/cm^3. Polyester base paper for printing.