JPS60111257A - Sheet adhesive paper for printer - Google Patents

Abstract

PURPOSE:To obtain adhesive paper for a printer or copying machine which uses xerographic sheet having improved run property by using base paper with superior curling property. CONSTITUTION:The base paper of adhesive paper uses >=90wt%, preferably, >=90wt% hard wood bleached kraft pulp. When this kraft pulp is <=80wt%, the paper is easy to curl improperly by being heated in the printer or copying machine. The beating degree (C.S.F) of the pulp is >=410cc, preferably, >=430cc. Further, starch added by incorporation and size press to improve the strength is <=2g/m<2>, preferably, <=1.5g/m<2>. The starch absorbs more moisture than the pulp and when it is added by >=2g/m<2> like a continunous slip form, the curl property deteriorates. Further, the fiber orientation at a wire part and dehydration condition at a press part are controlled in the making process of paper so as to stabilize the shape and size of curl.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to an adhesive paper for use in xerographic sheet-fed printers, and more particularly to an adhesive paper with improved running properties in a printer. .

Prior Art A xerography-type sheet-fed printer is a printer or copier that forms an image on a sheet of paper using an electrophotographic method. Processed paper that has an adhesive layer on it and can be bonded by simply applying pressure, applying pressure by impregnating the adhesive layer with water or an organic solvent, or applying heat and pressure. Conventionally, these adhesive papers include labels, labels, stamps, wallpaper, etc. It is also used to process it into a continuous slip, print it on a printer, and then fold it or glue it to create postcards or envelopes.

In recent years, with the mechanization of office processing, there has been a strong demand for the use of these adhesive papers in xerography-type printers or copying machines that use single-sheet paper.

However, with the adhesive paper described above, when the paper is passed through a printer or a copying machine, even paper with a small curl will curl significantly after heating, resulting in paper jams and cannot be used. Among these adhesive papers, continuous slip paper for printers that use xerography-type continuous slips is cut and processed into sheets, and can be passed through relatively well, but the size and shape of curls Furthermore, since stability is not taken into consideration, it is not practical for high-speed printers and copying machines as they tend to jam.

OBJECTS OF THE INVENTION The present invention aims to eliminate the drawbacks of the conventional adhesive paper described above and to provide an adhesive paper for use in xerography-type sheet-fed printers or copying machines that uses base paper with excellent curling properties. purpose.

Structure of the Invention The present invention provides a sheet-fed adhesive paper for printers in which an adhesive layer is provided on at least a portion of the paper surface of the base paper, in which 80 Jl (more than 80 Jl) of the valves of the base paper are bleached hardwood kraft valves, and the freeness of the valves is (C, S, F) is 410 cc or more, and the amount of starch added is 297 d or less.

That is, in the base paper of the adhesive paper of the present invention, 80% by weight or more, preferably 90% by weight or more of the bulbs are bleached hardwood kraft bulbs. 80% by weight of bleached hardwood kraft valves
If it is less than that, it tends to form an inappropriate curl shape when heated in a printer or a copying machine.

In addition, the freeness (C9S, F, ) of these valves is 41
It is 0eC or more, preferably 430 cc or more. For general high-quality paper and continuous slip paper, the valve beating degree is often set to 400 cc or less in order to obtain strength, but this is not desirable because the elasticity of the paper due to humidity increases and curling increases.

Paper making is often carried out in an acidic system with a pH of less than 7, but the base paper used in the present invention can also be made in a neutral system with a pH of 7 or higher. Furthermore, the starch added to improve strength by internal addition and size press is 2f/W? The following is preferably 1
．． 5ri/rr? It is as follows.

Starch is more hygroscopic than bulbs and deteriorates when 2t≠ as in continuous slip paper. In addition, in order to stabilize the shape and size of curls, in the paper making process, the fiber orientation in the wire part and the dehydration conditions of the press part are controlled, the surface temperature difference between the upper and lower dry cylinders of the dry part, and the number of calenders are controlled. Alternatively, delicate controls such as nip pressure control are implemented.

In addition, physical curling may be corrected using a decurler during the winding and cutting processes. In order to stabilize the curling properties, moisture control is carried out during the manufacturing process, the moisture content of the product is appropriately adjusted, and moisture-proof packaging is used to maintain this level.

Furthermore, it maintains an appropriate copy image density and eliminates background (
To prevent staining of the transfer paper (blank paper area), a conductive agent such as sodium chloride, potassium chloride, styrene-maleic acid copolymer, or quaternary ammonium salt is applied to the surface using the size press of the paper machine to increase the surface electrical resistance (JIS C) of the transfer paper. -2111
109-1010Ω (humidity (R,) 1.)
65% and the temperature is 20°C2. Furthermore, in order to improve the sharpness of the copy image area, surface irregularities are reduced and the smoothness of the transfer paper (according to JIS P-8119) is set to 20 seconds or more. The adhesive paper of the present invention is one in which an adhesive layer is provided on at least a portion of the paper surface of the above-mentioned base paper. Adhesives used include natural rubber-based, isoprene-based pressure-sensitive adhesives with low adhesive strength and tack, thermoplastic adhesives such as polyethylene and vinyl acetate, and rewetting adhesives such as dextrin, polyvinyl alcohol, and denatured starch. . These adhesives are selected and used depending on the purpose of the adhesive paper and the type of printer or copying machine used. These adhesives are applied to at least a portion or the entire surface of the base paper using a coater or a printing machine, depending on the purpose. Adhesive paper is also perforated, perforated, and printed depending on its use.

Next, the sheet-fed adhesive paper for printers of the present invention will be explained with reference to Examples and Comparative Examples.

Examples 1 to 9 and Comparative Examples 1 to 8 L-BKP (hardwood bleached kraft valve) and N-BKP
C softwood bleached kraft pulp) was appropriately beaten and blended as shown in Tables 1 and 2, and processed using internal chemicals (talc, rosin size, sulfuric acid bread clay) on a fourdrinier paper machine to
The paper was made at a speed of 450 m/min. In addition, starch was added with a conductive agent (sodium chloride) using a paper making and size press as shown in Table 1.
and coated as shown in Table 2. Using these base papers, adhesives as shown in Tables 1 and 2 were coated and cut to obtain adhesive papers of Example 1 to 9 and Comparative Example 1. When applying adhesive, use an air knife coater to apply the adhesive to the entire surface.
In the case of linear application, a 7-rekin type printing machine was used.

In addition, adhesive papers of Comparative Examples 2 to 8 were obtained by using commercially available high-quality paper, continuous slip paper, and continuous slip paper for non-impact printers as base papers and subjecting them to similar processing.

The radius of moisture curl curvature was determined for these 17 adhesive papers. Runnability was also evaluated using an FX9700 xerographic sheet-fed laser printer. These results are shown in Tables 1 and 2.

l) The valve compounding ratio is controlled during manufacturing, but J
Confirmed by the method of ISP-8120.

2) Bulb freeness was measured by the Canadian standard method (C, S, F, method) of JIS P-8121.

In addition, the bulb freeness of commercially available paper was determined by the following method.

A paper sample is disintegrated according to the Canadian standard method of JIS P-8121, and then measured. In addition, the type and content of the Jgi family in the paper is investigated, and the same amount of the filler is added to bulbs with the same bulb composition and known beating degree, and the beating degree is measured.

The known valve freeness was corrected by the difference between the freeness of the paper sample and the freeness of the filled valve.

3) The amount of starch added was determined by disintegrating a paper sample, eluting it with hot water, and using a colorimetric method using an iodine solution.

4) To measure curl, as shown in Figure 1, hang the center part of the side with the radius of curvature of paper l using clip 2, and compare it with the radius of curvature graph 3 with the bottom side placed below to determine the curl radius. I met.

5) ○: No running trouble occurred.

Δ: A small number of paper jams and folds occurred.

×; Paper jams and folds occurred frequently.

Effects of the Invention As mentioned above, the adhesive paper of the present invention has a pulp composition of the base paper,
The valve beating degree and amount of starch added are optimized, and it has excellent curling properties, so it can run efficiently even in high-speed printers without problems such as paper jams or folding.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a method for measuring the curl radius of paper. Code in the figure 1...Paper; 2...Clip; 3...Curvature radius graph 0

Claims (1)

[Claims] In sheet-fed adhesive paper for printers in which an adhesive layer is provided on at least a portion of the paper surface of the base paper, 80% by weight or more of the valves of the base paper is bleached hardwood kraft pulp, and the pulp softness (C, S, F) is 410 cc or more, and the amount of starch added is 2f/rr? Sheet-fed adhesive paper for printers with the following characteristics: