JPH04146299A - Yarn-containing paper - Google Patents

Abstract

PURPOSE:To obtain the subject product readily recoverable of spoilage paper and waste paper by forming a metallic deposited layer and a resin-protecting film soluble in alkaline hot water on a hot water-soluble film in turn, slitting the film, etc., in a thin breadth and dispersing resultant thread into paper. CONSTITUTION:At first, a metallic deposited layer is formed on a film (preferably PVA film) having 60-80 deg.C dissolving temperature in hot water and a resin- protecting film soluble in alkaline hot water at 60-80 deg.C is formed on the metallic deposited layer. Next, said film having the metallic deposited layer and the resin-protecting film is slit in a thin breadth, usually in 0.2-2mm breadth and resultant thread is dispersed into a paper layer to afford the objective product. Besides, as a metal constituting said metallic deposited layer, aluminum is preferable. Furthermore, a nitrocellulosic resin of alkalisoluble type, etc., is used as a resin soluble in alkaline hot water.

Description

[Detailed Description of the Invention] Hitoshi Purpose of the Invention [Industrial Application Field] The present invention is a paper machine that feeds out a thread at a predetermined position between paper layers. This is about a proposal that will make things easier.

C. Prior Art] Various safety measures are taken to prevent banknotes, checks, stock certificates, passports, cards, etc. from being illegally altered or counterfeited. An example of this is paper with threads inserted into the paper layer.

Producing paper with threads requires advanced technology, and if this paper is used for paper such as banknotes and checks, safety will be dramatically increased.

Conventionally, this type of paper with threads was produced, for example, in
No. 60, JP-A-51-130308, JP-A-51-1
As described in No. 30309, etc., a method of manufacturing with a long-grain paper machine, and a method of manufacturing with a cylinder paper machine, as described in JP-A-48-75808, etc., have been proposed. .

On the other hand, the threads inserted into the paper layer include woven threads, metal foils slit into narrow strips, and synthetic resin films coated with metal vapor-deposited and transparent or colored resin coated with thin strips. JP-A-56-151598, JP-A-58-54099, JP-A-63-18249, etc. which give special physical and chemical properties to filamentous materials, etc.
No. 7, British Patent No. 417488, British Patent No. 112704
No. 3, U.S. Patent No. 2143406, U.S. Patent No. 22556
Various proposals have been made, such as in No. 96.

[Problem to be Solved by the Invention] Conventionally, these threaded papers have had a reasonably good anti-counterfeiting effect, but have been unsatisfactory from the viewpoint of recycling waste paper. It is unavoidable that weft threads are generated during paper making, and when used paper (waste paper) is collected and papermaking fibers are recovered and reused, it is necessary to efficiently remove the above threads from the weft paper or waste paper. There is a need. Normally, horizontal paper or waste paper is put into a beater or pulper, etc. along with water, and the mixture is stirred in circulation to form a slurry, and then the filaments are removed using a screen or cleaner. However, since the filaments become intricately tangled during circulation, their removal is extremely difficult. It was difficult.

Among the thread-like materials mentioned above, the present inventors focused on a synthetic resin film coated with metal vapor deposition, transparent or colored resin coated on the surface, and slit into narrow widths, and created a thread-filled paper using this material. We investigated efficient ways to dispose of waste paper.

The above-mentioned thread-like material is called ``thread for gold and silver thread,'' and has traditionally been used in large quantities for ferrule silver thread J (manufactured by continuously winding a thread around a weaving thread in a spiral shape) used in Nishijin textiles and the like. The base film has excellent strength even though it is thin,
In addition, polyester film is widely used because it has excellent weather resistance, chemical resistance, and water resistance.
After being coated with a resin that has excellent water resistance, it is manufactured by slitting it into narrow pieces using a micro slitter.

The present inventors conducted various studies with the idea that the above problems could be solved by using a film that is soluble in hot water as the base film. In other words, various methods have been developed based on the idea that when waste paper and waste paper are collected using a beater or pulper, if the water is heated by blowing steam or the like and the film is dissolved, the waste paper and waste paper can be collected very easily. We proceeded with the consideration.

In this case, the performance of the hot water soluble film is that the film does not dissolve or swell excessively due to water during the formation of the Φ paper web (wet part); It is necessary that the film does not undergo any deformation that would pose a practical problem when using a Linder dryer or a Yankee dryer, and that the film be dissolved in hot water when collecting paper or waste paper.

As a result of the study, it was found that the hot water soluble film has a hot water dissolution temperature of 6.
If you use a thread that is heated to 0 to 80°C, is metal-deposited, and has its surface coated with a resin protective layer for gold and silver thread, you can make paper without the same problem. It was found that it can be easily dissolved.

However, although this method does dissolve the hot water-soluble film, it leaves behind fine fragments of the colored resin coated on the surface, which is still difficult to remove. Another problem arose with the incorporation of fragments into the paper layer.

The reason for this is that the resin used for the protective layer for gold and silver threads has particularly excellent chemical resistance, and does not easily dissolve even in hot alkaline water.

1. Structure of the invention [Means for solving the problem] The present inventors have developed a metal flII! The idea was that the above problems could be completely solved by using an alkali-soluble resin to be coated on layer II, and by using an alkaline substance in conjunction with the treatment of damaged paper and waste paper. Further consideration was given. As a result, we have found that this method has the remarkable effect of completely achieving the intended purpose, and have completed the present invention.

It is known to use alkaline substances, such as sodium hydroxide, sodium carbonate, slaked lime, etc., in conjunction with the recovery of broken paper and waste paper. These are added to saponify the ink vehicle and agin sizing agent and facilitate their removal.
It has not yet been used for the purpose of the present invention.

There are various types of water-soluble films, such as starch-based, methylcellulose-based, carbokylated methylcellulose-based, hydroxyethylcellulose-based, polyvinyl alcohol-based, polyvinylpyrrolidone-based, vinyl ethyl ether-maleic anhydride composite, polyacrylic acid-based, polyethylene Examples include oxide-based films.

The film used in the present invention needs to be dissolved in hot water at a temperature of 60 to 80°C, and the above-mentioned water-soluble polymers that fall within this range, or those that have functional groups or waterproof agents added to them, must be dissolved. Can be used in combination to raise the melting temperature.

In the present invention, it is preferable to use colored polyvinyl alcohol because it is relatively inexpensive, easily available, and has appropriate physical strength.

The solubility of polyvinyl alcohol in water is largely controlled by the degree of polymerization and saponification, particularly the degree of saponification. For example, substances with a degree of saponification of 88% or less can be completely dissolved in water at 20°C, but with a degree of saponification of 97%, they can only be dissolved in hot water of about 50°C, and with complete saponification at about 80°C.

When a film that melts at temperatures below 60°C is threaded and made into paper, the threads dissolve or swell excessively in the drying zone of the paper machine, making it impossible to maintain the thread-like shape, and melting at temperatures above 80°C. Since it is extremely difficult and dangerous to bring the slurry to temperatures above 80° C. during recovery, the melting temperature must be within the above range.

The thickness of the hot water soluble film is usually lO~100μm1
Preferably 20 to 60 μm is used.

The present invention provides aluminum in the hot water soluble film.
A metal evaporation layer of tin, zinc, chromium, coil, copper, gold, silver, etc. is formed by a known method such as vacuum evaporation method, S/M, Kling method, ionplate knob method, etc. . Its thickness usually ranges from 200 to 1500 people. In the present invention, it is preferable to use aluminum as the metal because it is inexpensive, resistant to corrosion, has excellent metallic luster, and is easily dissolved in alkali.

In the present invention, further, on this metal vapor deposition layer, 60 to 8
A resin layer that can be dissolved in a hot alkaline aqueous solution at 0° C. is formed. Generally, the metal vapor deposition layer is easily corroded, so the purpose is to protect it, and the thread can be colored by coloring the resin. If the resin layer is uncolored, the thread will have the color of the metal used (for example, if aluminum is used, it will be silver), and if it is colored yellow, in most cases the metal thin film layer will be silver, so it will appear gold from the surface. . Also, if you color it blue, it will look blue-silver, and if you color it red, it will look red-gold.

Examples of resins soluble in hot alkaline aqueous solutions include vinyl acetate resins, polyester resins, acrylic resins, polycarbonate resins, polyacetal xm resins, ionomer resins, nitrocellulose resins, acetylcellulose resins, phenolic resins, Melamine-based resins, urea-based resins, casei/urea-based resins, and/or resins that have been modified by introducing functional groups such as hydroxyl groups and carboxyl groups to make these resins soluble in alkali. or a mixture. In the present invention, from among these resins, we selected one that does not dissolve in hot water at a temperature range of 60 to 80"C, and that is Select and use the one that dissolves for the first time.

In the present invention, a microslitter is used to slit the above-mentioned treated film to produce threads.

The slit width varies depending on the product, but is usually 0.2 to 2 m.
m If in the middle? be. Next, the slits are made into the paper using a known method for producing thread-filled paper. Normally, the thread is affected by water in the wet part, swells appropriately, and is crushed and deformed in the press part (thickness of the thread decreases). This deformation does not occur with polyester film-based threads, so when paper is formed, the problem arises that the thread bulges by the thickness of the thread.

Therefore, moderate deformation as in the present invention provides a preferable result since no local thickening or thinning occurs in the formed paper.

When drying wet paper sheets, care must be taken because if the humidity is increased rapidly in the early stages of drying, the base film used for the threads may dissolve or swell excessively.

[Example] Next, the present invention will be specifically explained with reference to Examples, but the present invention is not limited thereto.

Example, l Metallic aluminum on a polyvinyl alcohol film with a thickness of 50μ and a hot water dissolution temperature of 80℃! Vacuum evaporated by 450 people, alkali-soluble vinyl acetate malemono resin (trade name: Nikkako) M S -M,
Using a paint mixture of yellow dye (manufactured by Nippon Kako Toyo Co., Ltd.), it was coated to a thickness of 4 μm (dry thickness) using a gravure roll coater. Then, using a micro slitter,
A thread was obtained by slitting it to a width of 03■.

Next, the pulp containing 30 parts by weight of NBKP and 70 parts by weight of LBKP was beaten to 350C3F, and then a sizing agent (trade name: Size Pine E1 manufactured by Arama Hayashi Chemical Manufacturing) was mixed with 1% solid content of the pulp and starch (trade name: Amicol 602, manufactured in several days).
was added at a solid content of 1% relative to the bulb, and the pH was adjusted to 4.5 with aluminum sulfate.

In the process of making paper into a width of 1 inch with a dry weight of 150 g/m'' using a Fourdrinier paper machine, 10 of the above threads were evenly spaced between the paper layers.The method was previously applied by the author of this patent. The method disclosed in Japanese Patent Application No. 50-56580 was used, that is, the method of supplying threads and dots between paper layers through a cylindrical guide nozzle at the beginning of the wet part.

Drying was performed using a multi-barrel dryer.

[1] Put 5 pieces of thread-filled paper made in this way into the pulper.
parts by weight, 95 parts by weight of water (i.e., f-lube concentration 5%), and 1 part by weight of caustic soda were charged and rotated while blowing live steam to raise the temperature to 70°C. , the surface resin coating layer was completely dissolved.

Example 2 Metal aluminum was vacuum-deposited by 500 people on a polyvinyl alcohol film with a thickness of 30 μm and a hot water dissolution temperature of 70° C., and an alkali-soluble nitrocellulose resin was coated with a thickness of 3 μm on the deposition surface and back surface (drying). thickness). Then, using a micro slitter, slits were made to a width of 0.35 cm to obtain threads.

Next, the pulp containing 40 parts by weight of NBKP and 60 parts by weight of LBKP was beaten to 400 CSF, and then a sizing agent (trade name: Size Pine E1, manufactured by Arama Hayashi Chemical Manufacturing) was mixed with 1% solid content based on the valve, and starch (trade name: Amicol 602, manufactured in several days).
was added at a solid content of 1% relative to the bulb, and the pH was adjusted to 45 with aluminum sulfate.

When combining two layers on a cylinder paper machine (dry weight 120g/m
100 layers of the above threads were made at equal intervals between the paper layers. Drying was performed using a multi-barrel dryer.

6 sheets of thread-filled paper made in this way are placed in a high-density pulper.
Parts by weight, 95 parts by weight of water (pulp concentration 5%) and 0.16 parts by weight of caustic soda were charged, and the mixture was rotated while blowing live steam, and when the temperature was raised to 11E70'c, the thread was completely dissolved.

C1 Effects of the Invention The present invention is constructed as described above and has excellent features as described below.

■It is easy to collect horizontal paper and waste paper.

■Compared to traditional polyester film-based threads, the threads of the present invention swell slightly in the presence of water,
Since it is flattened in the press part, when the paper is formed, the thickness of the paper at the thread part is less likely to increase.

■If you make perforations perpendicular to the direction of the thread and use them, for example, for train tickets or admission tickets, and tear each ticket stub along the perforations, it will cause a thread.

The C will not slip out of the cut.

■Producing the threaded paper of the present invention requires extremely advanced technology and has excellent anti-counterfeiting ability.

Claims (1)

[Claims] A metal vapor deposited layer is formed on a film with a hot water dissolution temperature of 60 to 80°C, a resin protective film that is soluble in alkaline hot water at the above temperature is formed on top of the film, and a thin thread is slit into thin strips.
A paper with threads, which is characterized by being made into paper layers.