JPS6141592A - Synthetic paper for non-impact printer - Google Patents

Abstract

PURPOSE:To enable the use of the titled synthetic paper as a production control table or commodity label, by employing a polyester fiber excellent in water resistance, heat resistance and thermal dimensional stability as a main component and forming the same into web along with a fine denier fiber in a blended state by a wet papermaking process while applying calender processing to the formed web. CONSTITUTION:A mixture consisting of 69.5-30wt% of a polyester stable fiber with monofilament finess of 0.3-6.0 denier, a fiber length of 3.0-20.0mm. and double refraction of 0.06 or more, 30-60wt% of a polyester fiber with fineness of 0.3-6.0 denier, a fiber length of 3.0-20.0mm. and double refraction of 0.3 or less and 0.5-10wt% of wood pulp is formed into a web by a wet papermaking process and calender processing is applied to said web under line pressure of 20-200kg/cm by using heating rollers with temp. of 180-240 deg.C. Thus obtained synthetic paper is not deteriorated by wetting or direct exposure to solar rays and has high temp. dimensional stability and excellent in sharpness of printing and durability by a non-impact printer.

Description

[Detailed description of the invention] <Industrial application field> The present invention is characterized by surface smoothness and high temperature dimensional stability.

This invention relates to synthetic paper for non-impact printers that has water and weather resistance.

<Prior Art> Recently, electronic non-impact printers have become popular as computer terminal equipment, and conventional high-quality processed paper is mainly used as recording paper.

Conventionally used high-quality paper includes, for example, ``A web is created using a wet or dry method using natural fibers or their derivatives and synthetic fibers, and a mixture consisting of a fine inorganic compound powder and an adhesive is applied to this web. ``Artificial paper with high opacity, high smoothness, air permeability, and printability that is passed through a heated roll after drying'' (% 16712/1983) or ``5 to 95% thermoplastic paper based on the pulp. A plasticizer showing good external plasticity is added to the powdered resin or fibrous resin or thermoplastic resin in an amount of 10 to 60% by weight based on the resin, and a sheet is formed by a wet method. ``Method for producing a sheet characterized by making it transparent by heating'' (Japanese Unexamined Patent Publication No. 118008/1983).

In addition, as a synthetic paper based on polyester fiber, ``In the manufacturing method of wet fleece, the wet fleece is
Formed by dehydrating a suspension containing undrawn polyester fibers as bonding fibers, and thermally bonded by bonding the fibers while drying at a temperature of 180° C. or less,
Next, calendering is performed to achieve a temperature of 180°C or higher,
"A method characterized by final fixation at a linear pressure greater than 30 kg/crrL" (Japanese Unexamined Patent Publication No. 53-783
No. 04) is disclosed.

However, with recent synthetic paper for non-impact printers, the printed recording paper is used as it is as a process control chart in a production factory or as a product label during the distribution process.

Therefore, production process control charts or product labels during the distribution process may get wet with water or be exposed to sunlight during use. It cannot be used for this purpose.

On the other hand, even if we try to use synthetic paper that is not damaged or deteriorated by water or direct sunlight, it is not practical because the printing paper will undergo heat shrinkage when exposed to high temperatures of 150 to 200 degrees Celsius when fixing carbon toner in a printer. Met. Therefore, there is a need for non-impact printer paper that has excellent water and weather resistance and is dimensionally stable even at high temperatures of 150° C. or higher.

<Purpose of the Invention> The present invention is a paper made by wet-processing, which is made mainly of polyester fibers with excellent water resistance, heat resistance, and thermal dimensional stability, and mixed with fine denier fibers in order to improve printability as a recording paper. The object of the present invention is to provide a synthetic paper which can be used as a production control chart or a product label by imparting paper strength and surface smoothness by subsequent calendering.

<Structure of the Invention> That is, the present invention provides: ``(1) A synthetic paper made of short polyester fibers with a single fiber fineness of 0.3 to 6.0 deniers and a fiber length of 3.0 to 20.0111 and wood pulp, 69.5-30% by weight of polyester short fibers with refraction of 0.06 or more, birefringence of 0.0
3 or less polyester short fibers 30-60% by weight.

Synthetic paper for non-impact printers made of 0.5-10% by weight of wood pulp and heat-press processed (2) Single yarn fineness 0.3-6.0 denier, fiber length 3.0
69.5 to 30% by weight of polyester short fibers with a birefringence of 0.06 or more.

Fineness 0.3-6.0 denier, fiber length 3.0-20, O
polyester short fibers with snw birefringence of 0.03 or less 30~
A mixture consisting of 60% by weight of wood pulp and 0.5 to 10% by weight of wood pulp was wet-paper-made into a web, and then heated at a heating roller temperature of 180-240°C and a heel pressure of 20-20 oky/am.
A method for producing synthetic paper for non-impact printers, which is characterized by calendering.

The polyester fiber used here has a fineness of 0.3 to
It is a short fiber with a denier of 6.0 and a fiber length of 3.0 to 20.0 m. If the fineness is less than 0.3 denier, the resulting synthetic paper will have poor strength and stiffness. If it exceeds 6.0 denier, the strength and stiffness of synthetic paper will be sufficient, but it will give a rough and hard feel, making it unsuitable for use as printing paper.

Fiber length is 3. If it is less than On, the tensile strength of the synthetic paper will be insufficient as a result of insufficient bonding points between single fibers when subjected to heat-pressure treatment.

If the fiber length exceeds 20.011 IK, the bonding points between single fibers become uneven when subjected to heat-pressure treatment, resulting in a loss of surface smoothness of the synthetic paper.

Further, the polyester fibers are mixed in a range of 69.5 to 30% by weight of fibers having a birefringence of 0.06 or more and 30 to 60% by weight of fibers having a birefringence of 0.03 or less.

When the mixing ratio of polyester short fibers with birefringence of 0.06 or more exceeds 69.5%, the mixing ratio of polyester short fibers with birefringence of 0.03 or less is less than 30%, but when the birefringence is 0. If the mixing ratio of short polyester fibers of 03 or less is less than 30%, there will be insufficient bonding points between the fibers, resulting in insufficient strength of the synthetic paper.

When the mixing ratio of polyester short fibers with birefringence of 0.06 or more is less than 30% (when the mixing ratio of polyester short fibers with birefringence of 0.03 or less exceeds 60%), the thermal stability of synthetic paper (dimensional stability) becomes insufficient.

The amount of wood pulp added is 0.5 to 10%.

If the amount of wood pulp added is less than 0.5 fii%, when processing into non-impact printer paper, the punching properties of the marginal holes through which the paper is fed will deteriorate, and the grooves attached to the paper will not be removed from the punched paper.

When the amount of wood pulp added exceeds 10%, the strength of the synthetic paper decreases, particularly the wet strength decreases significantly.

A mixture of these specific short polyester fibers and wood pulp is made into a web by a conventional wet papermaking method. The paper machine uses circular mesh and short mesh.

Any fourdrinier may be used, and any conventionally known paper making method may be used. Thickeners, antistatic agents, or various fillers may be added in papermaking, and in some cases, a small amount of polyvinyl alcohol-based fibrous binder may be added to provide strong adhesion to pulp or rayon. Good too.

The web made in this way is still strong.

The surface smoothness is insufficient, and it is necessary to further pass through a hot pressing process using hot rolls. It is preferable that both of the rollers for heat-pressing the heat rollers are heatable metal rollers, but in some cases, only one heatable metal roller and the other may be a roll made of ph, heat-resistant rubber, asbestos, or the like. The pressure and temperature during hot pressing vary depending on the raw material composition and thickness of the product, but it is usually preferable to use a heating roller temperature of 180 to 240°C, a linear pressure of 20 to 200, and a range of 1 P/cWL.

Furthermore, the synthetic paper of the present invention has flame retardant and antistatic properties.

In order to add functions such as antifouling properties, post-processing may be carried out to add functionality to the product, as long as it does not interfere with the purpose of the present invention. Especially for non-impact printers, it is desirable to apply antistatic treatment.

<Effects of the Invention> The synthetic paper of the present invention thus obtained can be used as recording paper for non-impact type high-speed kanji printers, especially for labels of products exposed to sunlight during the distribution process, and for use with oil in factory production processes. It can also be used as display labels for various assembly parts that may get wet with water, or as ledger paper for viewing by taking advantage of its high strength. It has the following effects.

(1) It does not change in quality even if it gets wet with water.

(2) No deterioration even if exposed to direct sunlight.

(3) High dimensional stability at high temperatures.

(4) Printing characteristics by non-impact printer (
Excellent printing clarity, durability, etc.)

<Example> The present invention will be specifically explained below using examples.

Examples 1-4. Comparative Examples 1-2 Birefringence is 0.161 as polyester short fibers with birefringence of 0.06 or more (hereinafter referred to as highly oriented polyester fibers)
, using polyethylene terephthalate short fibers with a single yarn fineness of 1.5 denier and a fiber length of 5 m, with a birefringence of 0.012 and a single yarn fineness of 1 as polyester short fibers with a birefringence of 0.03 or less (hereinafter referred to as low-oriented polyester fibers). Polyethylene terephthalate staple fibers with a fiber length of 1111 g and a denier of 1 denier were used. NBKP was used as the wood pulp.

After mixing these materials at the mixing ratio shown in Table 1 and wet paper making, a calender roll (a combination of a metal roll and a paper roll) was heated at a temperature of 220°C and a linear pressure of 80 to 9/cd. The samples were subjected to heat-pressing processing.The basis weight of each sample was approximately loog/@.The results are shown in Table 1.

Table 1 Example 5. Comparative Examples 3-5 Samples of Example 2 (Example 5) and as a comparison, thickness of approx.
00μ commercially available polypropylene film synthetic paper (Comparative Example 3
), commercially available polystyrene film synthetic paper (Comparative Example 4) and polyethylene terephthalate film (Comparative Example 5) were each cut into widths of 20 mm (Mll + length of 30 cIIL), and a printing test was conducted using a non-impact type high-speed Kanji printer (9700 Eps manufactured by Xerox ■). The results are shown in the second
Shown in the table.

Table 2 Example 6. Comparative Example 6 Polyethylene terephthalate (birefringence 0.161, single yarn fineness 1.5 denier, fiber length 5) 65% by weight short fibers 4 Birefringence 0.012, single yarn fineness 1.1 denier, fiber length 5111 3 polyethylene terephthalate staple fibers
After mixing 5% by weight, wet paper making was carried out, and then the temperature was 220°C.
, Calender processing was performed under hot pressure conditions of a linear pressure of 8 ok/ffl. The basis weight was 98 g/ze.

The obtained synthetic paper was stacked 15 times and punched 10 times with an electric porous punch (round hole type, 22 holes, hole diameter 4.5'm) to evaluate punching performance (Comparative Example 6). The same procedure was carried out for the synthetic paper obtained in Example 2 (Example 6), and the results are shown in Table 3.

Table 3

Claims (2)

[Claims] (1) Single yarn fineness 0.3-6.0 denier, fiber length 3.0
Synthetic paper consisting of polyester short fibers of ~20.0 mm and wood pulp, 69.5 to 30% by weight of polyester short fibers with birefringence of 0.06 or more, and 30 to 60% by weight of polyester short fibers with birefringence of 0.03 or less. Weight %, wood pulp 0.
Synthetic paper for non-impact printers, consisting of 5 to 10% by weight and processed by heat and pressure. (2) Single yarn fineness 0.3-6.0 denier, fiber length 3.0
~20.0mm, 69.5-30% by weight of polyester short fibers with birefringence of 0.06 or more, fineness of 0.3-6.0 denier, fiber length of 3.0-20.0mm, birefringence of 0.03 or less Polyester short fibers 30-60% by weight, wood pulp 0
．． Production of synthetic paper for non-impact printers, characterized in that a mixture consisting of 5 to 10% by weight is wet-paper-made into a web, and then calendered at a heated roller temperature of 180-240°C and a linear pressure of 20-200 kg/cm. Method.