WO1992007137A1

WO1992007137A1 - Method of pulping waste pressure-sensitive adhesive paper

Info

Publication number: WO1992007137A1
Application number: PCT/JP1991/001366
Authority: WO
Inventors: Osamu Kitao; Masaru Tsuji; Masatoshi Okuda; Shunichi Uchimura; Jun-Ichirou Tanaka
Original assignee: Kanzaki Paper Mfg., Co., Ltd.
Priority date: 1990-10-19
Filing date: 1991-10-07
Publication date: 1992-04-30
Also published as: DE4192568T; DE4192568C2; FI922756A0; FI103900B1; FI103900B

Abstract

A method of obtaining regenerated pulp superior in quality by pulping waste pressure-sensitive adhesive paper to which no treatment other than discarding has hitherto been applicable comprises such processes that: waste paper is disaggregated; suspension of said disaggregated waste paper is diluted; diluted liquid is roughly filtered with a screen having slits 0.5 mm wide or less; pulp-containing suspension obtained is dehydrated and concentrated so that concentration of solid content is 15 to 40 % by weight; mechanical agitating treatment is applied to said concentrated material while keeping a temperature difference of said material before and after the treatment at 12 °C or lower; a material thus obtained is again diluted; the diluted liquid is finely filtered with a screen having slits 0.2 mm wide or less; surfactant is added to said material for floatation treatment; and cleaning treatment is applied to said material by means of a heavy-foreign-matter cleaner and/or light-foreign-matter cleaner prior to washing.

Description

Akira Itoda

Pulping method of waste pressure-sensitive adhesive paper

The present invention relates to a method for pulping waste paper. In particular, the present invention relates to a method for obtaining recycled pulp from waste pressure-sensitive adhesive paper (including waste paper), which had to be disposed of in the past. More particularly, the present invention relates to a method for improving the separation effect of a pressure-sensitive adhesive, silicone, plastic film, and the like contained in the used pressure-sensitive adhesive paper waste paper, and obtaining a recycled pulp having a high whiteness. Background technology

At present, the amount of used paper, including recycled waste paper, as a raw material for the production of paper and paperboard exceeds 50% of the raw material produced, and it has already become the main raw material.

Recycled paper that can be recycled and pulped is newspaper, cardboard, magazines, imitation, color (including art), white, power, special white, medium white, 1¾Manila, tickets, middle quarrel, Examples include tea imitation paper (including Western paper), backing paper, ground tickets, balls, thermal recording paper, pressure-sensitive copying paper, and CP0 (Computer Printout).

These recycled pulping methods from waste paper generally include a defibration process of disintegrating waste paper to obtain a pulp suspension, separating foreign matter in the pulp suspension, a rough-selection process, a screening process, and separating printing ink. Recycled pulp is obtained through a deinking process and a bleaching process that uses colors. Paper, coated with hot-melt, pressure-sensitive adhesive, hot-melted paper, etc. cannot separate wax, pressure-sensitive adhesive, hot-melt, etc. from the valve fiber. At present, waste paper that cannot be recycled and pulped, that is, “contraindicated”, is disposed of or incinerated. Supplementary to this point, the waste paper standard quality standards established in the industry, the waxed paper mentioned above, pressure-sensitive adhesive Paper and paper coated with hot melt are not allowed to be mixed into paper raw materials in principle, and even if a small amount is unavoidable, the mixing rate must not exceed 0.3%. Stipulated.

The reason for the pressure-sensitive adhesive paper is as follows. In other words, the pressure-sensitive adhesive paper contains 5 to 50% of the pressure-sensitive adhesive, and since the pressure-sensitive adhesive has a strong adhesive force, it cannot be separated from pulp fibers. It is. In addition, if the recycled pulp is used to make paper while the pressure-sensitive adhesive is still contained in the recycled pulp, the pressure-sensitive adhesive closes the eyes of the wires and stains breath rolls and blankets during the paper making process. In addition, there is a problem of causing paper breakage and significantly lowering papermaking efficiency, and in addition, there is a fatal problem of adversely affecting paper layer formation or quality, such as formation of spots on the paper surface. I just got it. Under these circumstances, a method of recycling and pulping used pressure-sensitive adhesive paper from recycled paper has not yet been attempted, and no proposal for a pulping method is known in the literature.

Here, the present invention proposes a novel method for obtaining recycled pulp from waste paper of pressure-sensitive adhesive paper, and in particular, effectively removes foreign substances such as pressure-sensitive adhesive, silicone, and plastic film. In addition to separation, we also provide a pulping method to obtain recycled pulp with high whiteness even at a bed that contains colored waste paper, and to obtain recycled pulp that does not cause operational problems or uneven ground during the papermaking process. It is intended to do so. Disclosure of the invention

The present invention relates to a pulping method for obtaining recycled pulp from waste paper of pressure-sensitive adhesive paper, which comprises: (1) disintegrating the waste paper, (2) diluting the disintegrated suspension, and (3) diluting the diluted solution with a slit width of 0. 5 After the roughing treatment using the following screen, なし The pulp suspension (accept material) after the roughing treatment is dehydrated and concentrated to a solid content of 15 to 40% by weight. The temperature difference of the raw materials during mechanical agitation (= before and after kneading) becomes 12 C or less. The above-mentioned mechanical agitation treatment is performed under the following conditions, ⑥the obtained raw material is diluted again, ⑦the diluted liquid is finely filtered through a screen having a slit width of 0.2 mm or less, and then ⑧the obtained raw material is obtained. Add the surface active agent to the accept raw material and stir while introducing air to perform foam flotation treatment (-floatation treatment). Further, for heavy foreign matter ffl cleaner and Z or light foreign matter This paper proposes a method of pulping used pressure-sensitive adhesive paper, which is characterized by performing a cleaning treatment after cleaning with a cleaner. Includes those that use only used paper.

By the way, the pressure-sensitive adhesive paper targeted by the present invention is commercially processed into labels, sheets, patches, and the like, and is used in a wide range of applications such as commercial ffl, office use, home use, and the like. It is paper. The general configuration of such a pressure-sensitive adhesive paper is such that a pressure-sensitive adhesive layer is sandwiched between a surface substrate X and a release substrate Y as disclosed in FIGS. 1 (a) to 1 (c). It is a structure which was touched. In other words, paper 11, which is a main member of the surface base material, includes craft paper, medium-quality paper, high-quality paper, coated paper, art paper, cast-coated paper, pressure-sensitive copying paper, heat-sensitive recording paper, PPC (Plain Paper Copier) and papers made by laminating them with plastic are used. For the part of the product, plastic film and aluminum oil etc. are used instead of the above paper as the surface base material. Some were. The pressure-sensitive adhesive 12 is applied to the back surface of the front substrate 11. Incidentally, as the pressure-sensitive adhesive, a rubber-based, acrylic-based, vinyl ether-based, emulsion-type, solvent- or solvent-free pressure-sensitive adhesive is used.

On the other hand, the paper constituting the release base material Y is shown in Fig. 1 (a), and the surface of craft paper, high-quality paper, coated paper, art paper, cast coat paper, etc. is made of plastic film. Laminated paper is used, or high-density paper such as glassine paper is used as shown in Fig. 1 (b). Pressure The fact is that most of the adhesive paper is used.

Others use a pigment coated paper 15 having a pigment coating layer 14 on both sides as shown in FIG. 1 (c). Then, on the surface of the release base material Y, a release agent 16 such as a siliconized mount or a fluorinated mount is coated, and the coated surface is the pressure-sensitive adhesive 12 on the surface base X side described above. Are adhered in a state where they face up to the coated surface. In addition, as the release substrate, in addition to the above-mentioned paper, there is also used a substrate obtained by directly applying a silicone compound (a release such as a fluorine compound) to a plastic film or the like.

The waste paper of the pressure-sensitive adhesive paper to be processed by the present invention refers to the above-mentioned products that have already been used for their intended use. However, it is extremely difficult to collect only the pressure-sensitive adhesive paper separately from other paper waste in general considerations in view of the actual state of waste paper recovery. Therefore, the present invention does not aim to use used pressure-sensitive adhesive paper that is currently used, but for the present time, it is necessary to use the same as the base that can be sorted and collected in the future. Of course, it can be used as a raw material for waste paper.

As a practical matter, the relatively large amount of waste paper of pressure-sensitive adhesive paper is generated in the process of manufacturing pressure-sensitive adhesive paper. As is well known, in the process of producing pressure-sensitive adhesive paper, initially, a wide surface base material or a release base material is supplied as a roll-shaped base paper, and a release agent such as a silicone resin and a pressure-sensitive adhesive are further added. Coated and laminated. However, it is very difficult to accurately bond the surface base material and the release base material in the width direction in the bonding process, and if they are misaligned, the price of the product is significantly reduced. Therefore, it is necessary to cut the paper immediately after the laminating process with slits and cut off both ends (ears) of the paper. The ears, abnormal quality products, and the last part of the take-up, which are cut off scraps, are usually referred to as broke, and are generated in a considerable amount, but were discarded as described above. In the present invention, the waste paper generated in the process of producing the pressure-sensitive adhesive paper is used as a waste paper raw material on an industrial scale for the time being (of course, the waste paper raw material recovered mainly from used pressure-sensitive adhesive paper is included. Recycling pulping is possible.

Hereinafter, details of the recycled pulping method of the present invention will be disclosed. As shown in the flow sheet of FIG. 2, in the present invention, the waste paper 21 of the pressure-sensitive adhesive paper as described above is guided to a disintegration process indicated by reference numeral 22, and disintegrated using a pulp or the like to form a suspension. You. In this defibration step, foreign substances such as pressure-sensitive adhesive and plastic film contained in the used paper are pulverized through a stirrer mounted on a pulp or the like, and the foreign substances are stirred. Excessive mechanical action of the machine, etc., and too finely crushed will degrade the foreign matter separation effect in the subsequent selection process and flotation separation process.

Therefore, in determining the degree of disaggregation in the disaggregation step, the foreign matter is adjusted so as not to be finely crushed, so that the selection and separation efficiency in the subsequent steps are not reduced. The method of adjusting the degree of defibration can be adjusted by adjusting the length of defibration time, pulp concentration, water temperature, addition amount of aliquots, etc., in the case where equipment such as pulper is determined. Not.

It should be noted that, depending on the type of paper that constitutes the surface substrate of the used paper / the release substrate, there are those that are easily disintegrated and those that are difficult to disintegrate. What is easy to disintegrate is the force that can be disintegrated only with water; ', the one using glassine paper, or the special paper that is made water-resistant or strong with resin, etc. Depending on the case, it may be preferable to disintegrate by adding alcohol or the like. As described above, since the disintegration varies depending on the type of paper used between the surface substrate and the release substrate, it is necessary to confirm the disintegration peculiar to the broke through preliminary experiments, and perform appropriate disaggregation work accordingly. Is desirable.

The present invention provides a method for diluting a used paper suspension obtained by the above disintegration process. After that, the diluted solution is treated using a screen with a slit width of 0.5 translation or less (hereinafter, this is referred to as a rough selection process and indicated by reference numeral 23 in FIG. 2). The foreign matter of the pressure-sensitive adhesive paper to be treated by the present invention is different from the pulp fiber in shape, and the pulp fiber is elongated, having a diameter of 40 or less and a length of 7 mm or less, whereas the foreign matter is disintegrated. By adjusting the degree, the shape can be made larger than the pulp fiber. Therefore, an excellent separation effect can be exhibited by performing a selective treatment as described below using the shape difference.

By the way, the screen used in the present invention is a force limited to a slit-plate type screen. <The reason is that, according to the experiments conducted by the present inventors, a round hole type screen, which is another screen, is used. This is because the separation effect is remarkable compared to Also, the hole of the slit plate in the above-mentioned screen must be 0.5 dragon width or less. If the width is larger than that, the hole is too large, As a result, the foreign matter separation effect is poor, and the burden of flotation separation in later processes increases. On the other hand, if it is 0.5 mm or less, the effect of separating foreign matter and pulp is good, and the burden of flotation separation in the subsequent process can be reduced. The type of screen is not particularly limited as long as the slit plate has a hole having a width of 0.5 or less.

The pulp suspension (executed raw material) that has been subjected to the screen treatment as described above is subjected to a dehydration and concentration step indicated by reference numeral 24 in the figure to reduce the solid concentration to 15 to 40% by weight. After adjusting the amount to preferably 15 to 30% by weight, more preferably 20 to 25% by weight, the mixture is introduced into the mechanical dipping step 25. That is, in the bonding step, a high degree of shearing action is applied to the accepting raw material using a kneader under a temperature condition as described below, and the adhesive as the foreign substance is added to the bonding material. The process is characterized in that the treatment is carried out so as to be granulated without dispersing as much as possible. In order to achieve this object, according to the present invention, before and after the kneading step, It is an essential requirement that the temperature difference between them be kept at 12 ° C or less. When the pulp concentration in the above-mentioned pudding process was reduced to 15% or less, the desired shearing action could not be imparted. Excessive shearing action on pulp and foreign material.

The raw material obtained by the above-mentioned 21 dipping treatment was diluted with the reference numeral 2 in FIG. 2 so that the pulp concentration became 596 or less again (as shown by 5), and The pulp is separated from foreign matter by using a screen with a slit width of 0, 2 mm or less, where the foreign matter is granulated by the above kneading process. The type of screen is not particularly limited as long as the slit plate has an eyelet with a width of 0.2 mm or less. It is also possible to carry out the processing several times, and it is preferable that the screen and the subsequent screen have the functions of flotation, centrifugal separation and plate sieve separation at the same time. Cube subscription - there is a down (Sato Mi Co., Ltd.).

The separated raw material is added to the surfactant 剂 and then led to the flotation step 28, where the foam is floated and separated by stirring while introducing air. The pulp concentration at the time of flotation may be about 0.1 to 1.5%, and is not particularly limited. In addition, the flotation device used in the present invention can use a conventional floater one by one as it is, and does not require a special device. As the surfactant used in the present invention, a deinking agent that is generally used when deinking printed waste paper can be used, and among them, fatty acid-based or oil-based ethylenoxide / brovirene can be used. When an oxide adduct or a surfactant mainly composed of fatty acid stones is used, the pressure-sensitive adhesive is efficiently adsorbed on the surface of the foam. This has the effect of improving the foreign matter separation effect. The amount of the surfactant to be added may be appropriately adjusted in view of the state of foaming, and may be added in an amount of about 0.01 to 1.0% (based on dry pulp).

Next, in a cleaner treatment step indicated by reference numeral 29, the cleaner for heavy foreign matter and the cleaner for Z or lightweight foreign matter are passed through to separate the norp and foreign matter. Incidentally, the cleaner treatment is a concept separate from the above-described screen treatment, and is a concept of separating foreign matter and pulp using a specific gravity difference. In the cleaner treatment 29, when light foreign substances (for example, plastic film) are present in the raw material, a cleaner treatment for removing the light foreign substances is performed, and when heavy foreign substances (for example, sand, metal fragments, pigments, etc.) are present. In this case, a cleaner treatment for removing heavy foreign matter is appropriately provided. The pulp liquor thus obtained is led to the final washing step 30, where it is subjected to dehydration and washing in accordance with a conventional method to remove residual bleaches, dyes or fillers. Finished pulp 31 is obtained.

By the way, even if the kneading process is omitted, and the roughing process and the fine screening process alone are used, a surfactant is added, air is introduced, and the flotation process is performed, but the pressure-sensitive adhesive is separated from the pulp. Efficiency is not always enough. Among the foreign substances that have passed through the selection process, there are thin but large-area foreign substances that cannot be sufficiently removed by the flotation treatment. Also, after the kneading process, even if it is diluted and subjected to flotation separation, it cannot be completely removed. The inventor of the present invention has eagerly investigated the cause of this problem. As described above, in the kneading step, when the so-called granulating effect of making the pressure-sensitive adhesive particles remaining in the pulp spherical is exerted, As a result, relatively large particles of the pressure-sensitive adhesive are less likely to float together with the bubbles by the foam flotation treatment, and the efficiency of separation of the pressure-sensitive adhesive from the pulp is reduced. As a countermeasure, the present inventors perform a selective process using a screen plate having a slit width of 0.2 or less after the kneading process, and then perform a flotation process to achieve a desired process. The inventors have found that effects can be obtained, and have completed the present invention. In addition, It was found that most foreign substances other than pressure-sensitive adhesives such as plastic films were removed during the initial rough selection process.

Hereinafter, the processing method in the case where the waste paper of the pressure-sensitive adhesive paper to be processed according to the present invention contains a colored substance, and the separation of the pressure-sensitive adhesive, which is a foreign substance, from the ル -loop fiber will be further improved. For the purpose of this study, we will explain the treatment method for the case where a special method is added and the case where glassine paper is used as the release base material of the pressure-sensitive adhesive paper.

First, the case where the used paper contains a colored material will be described. In this case, it is preferable to add a bleaching agent immediately before the above-mentioned needing treatment. If no bleaching agent is added, the recycled pulp is colored, and if used as is, the paper obtained by papermaking is also affected by the colored pulp, reducing the whiteness of the paper and reducing its commercial value. Therefore, it is especially important to perform bleaching treatment on stands where the used paper contains colored materials.

As the bleaching agent, oxidizing agents such as sodium hypochlorite or calcium hypochlorite, hydrogen peroxide and sodium peroxide, and reducing agents such as hydrosulfite and formamidine sulfinic acid can be used. In particular, pentasodium hypochlorite or calcium hypochlorite is preferred because of its strong ability to decompose the dye.

The amount of bleach added is adjusted as appropriate depending on the type and amount of dye contained in the paper. After the bleach has been added, it must be uniformly dispersed in the pulp suspension with sufficient agitation. For this reason, a chemical mixer is usually used, but in the present invention, a bleaching agent is added immediately before the denting step, and uniform dispersion is achieved by tussers in a kneader.

Thus, the obtained recycled pulp has high whiteness, does not form traps in the papermaking process and does not form spots on the paper surface, and can form paper with excellent formation, which is industrially extremely useful. Recycled pulp is obtained.

Next, an inorganic pigment is added in the process of obtaining the recycled pulp of the present invention. In this case, a more excellent effect can be obtained, and this point will be described in detail below.

That is, in the pulping process for obtaining recycled pulp from the waste paper of the pressure-sensitive adhesive paper, at least the process in which the waste paper is first subjected to a mechanical action, in other words, the disintegration process indicated by reference numeral 22 in FIG. On the other hand, add 1% by weight or more of inorganic pigment. When the treatment is performed in this manner, even if the pressure-sensitive adhesive has a strong adhesive force, the adhesive is relatively easily separated from the pulp fiber, and as a result, the process stain in the papermaking process is reduced. The occurrence of troubles that cause troubles can be almost completely eliminated.

According to the results of the study by the present inventors, in order to obtain a further effect, in the step of imparting a mechanical action to the waste paper, the inorganic pigment was added to the waste paper by a weight of 3 wt. % Is better. It is not clear why this effect can be obtained, but the pressure-sensitive adhesive is transformed into a large number of small particles by mechanical action, and the surface of the particles is covered with inorganic pigments. This is considered to prevent the adhesive from coming into direct contact with the inner walls of equipment such as tanks and piping.

Examples of the process for imparting mechanical work to the used paper where inorganic pigments are added include a used paper disintegration process, a kneading process, and a high-speed disintegration process (process for disintegrating raw materials after kneading). In other words, the inorganic pigment may be added only to the first disintegration step in the waste paper processing, but the inorganic pigment is dispersed and added to the kneading step after this disintegration step or the high-speed disintegration process. Is more preferable. It is also desirable to add inorganic pigments in these steps, since the adhesive becomes smaller particles due to mechanical action in these steps and a new adhesive surface appears.

The inorganic pigment used in the present invention is not particularly limited, and any pigment can be used. For example, calcium carbonate, magnesium carbonate, calcium magnesium carbonate, silicate, gay acid, aluminum Examples include hydrates, barium sulfate, calcium sulfate, calcium sulfite, titanium dioxide, and zinc pigments, and a mixture of two or more of these pigments is also possible.

By the way, these inorganic pigments and adhesives are removed in the screening process, one cleaning process, one whole froth process, and one cleaning process. Thus, the adhesive and dirt during the pulping process of the pressure-sensitive adhesive paper waste paper are eliminated, and a high-quality recycled pulp can be obtained.

As an example of waste paper of pressure-sensitive adhesive paper, a method of efficiently pulping waste paper in which glassine paper is used as a release substrate, that is, waste paper of glassine release paper will be described. That is, it is preferable to add an acidic substance in the disintegration step of disintegrating the waste paper into the pedestal for the waste glass waste paper (see reference numeral 32 in FIG. 2). It is advisable to add after maintaining the processing temperature in the process at 30 ° C or higher.

As is well known, glassine paper used as a base material for release paper is made using highly beaten pulp fiber and surface-treated with a super-carry render. Is extremely difficult. In addition, since the glassine paper is coated with a release agent such as a silicone compound / fluorinated compound, the disintegration in the pulping step is more difficult. For this reason, at present, the use of recycled valves for waste paper, including pressure-sensitive adhesive paper that uses glassine release paper, has been avoided, and is currently treated as industrial waste.

By the way, in order to promote the disintegration of the pressure-sensitive adhesive paper used for the dalacin release paper, it is possible to add an alkali agent or extend the disintegration time. When employed, the disintegration of the paper substrate is promoted, but at the same time, the plastic / pressure-sensitive adhesive is improperly fragmented, which makes it extremely difficult to remove it in the subsequent separation step. In particular, when the separation angle is extended, the disintegration of the paper base material is promoted, but the plastic (pressure-sensitive adhesive) is also fragmented. At the same time, it is finely divided so as not to be easily removed in a subsequent processing step, resulting in hindering separation in a subsequent screen processing step.

Plastics are not fragmented with an alkaline agent, but are fragmented by extending the defibration time. The adhesive is softened by alkali, and is easily broken into pieces by defibration.

Therefore, in the present invention, in the step of defibrating old pressure-sensitive adhesive paper including dalacin release paper, which is particularly poor in defibration, while promoting the defibration of the paper base material, on the other hand, the pressure-sensitive adhesive or the like is not used. This problem is solved by adding an acidic substance in the defibration step so as not to appropriately shred the pieces. That is, it has been found that when the acidic substance is added in the defibration step as described above, the defibration of the paper base material is greatly promoted, and fragmentation of the plastic or pressure-sensitive adhesive can be prevented.

The acidic substance used in the present invention is not particularly limited. For example, hydrochloric acid, sulfuric acid, nitric acid, acetic acid, formic acid, sulfuric acid band, sodium hydrogen sulfate, sodium hydrogen sulfite, waste sulfuric acid from a facility for producing chlorine dioxide And acidic sodium sulfate.

The amount of the acidic substance to be added is adjusted according to the content of the type of the pressure-sensitive adhesive paper using glassine release paper, but is preferably 0.3 to 15% by weight, more preferably 1 to 15% by weight, based on the whole waste paper. ~ 10 weight About 6 should be added. In addition, in order to promote disaggregation, it is better to set the temperature during disaggregation to 30 ° C or higher, and the higher the temperature, the more the disaggregation. However, if the temperature exceeds 100 ° C, the equipment cost of the pressurized container becomes enormous and it is not economical. It is better to be less than C.

The pulp suspension, which has been disintegrated by adding an acidic substance as described above, is subjected to a roughing process, a edging process, and a fine screening process according to the above-described method, and then to a floatation process, It is introduced into the washing process, and if necessary, the bleaching process and the like are appropriately combined to recycle pulping. Recycled pulp with high pulp recovery rate where plastics etc. are effectively separated and removed, and are extremely industrially ffl Become BRIEF DESCRIPTION OF THE FIGURES

FIGS. 1 (a) to 1 (c) are enlarged cross-sectional views showing a specific structure of the pressure-sensitive adhesive paper, and are composed of a surface base member indicated by X and a release substrate indicated by Y in the figure. Paper is used as a main component of each base material. FIG. 1 (a) shows a poly-laminate type in which a polyethylene film is laminated on a part of one side of the release paper. FIG. 1 (b) shows a glassine type using glassine paper as the release paper. Fig. (C) shows a clay-coat type in which clay is coated on both sides of release paper. FIG. 2 is a flowchart showing an outline of the processing steps of the recycled pulping method as a wood invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but it is needless to say that the present invention is not limited thereto. In the examples,% indicates% by weight.

[Example 1]

Silicone resin is applied as a mold release agent to cream-colored high-quality paper made by laminating a polyethylene film as a release substrate with cast-coat paper as the release substrate, and acryl as a pressure-sensitive adhesive on the surface of the release substrate. A pressure-sensitive adhesive paper coated with a system emulsion was used as a raw material for waste paper.

To the high-concentration pulp (Aikawa Iron Works: high-concentration pulp), 5% (vs. waste paper) of the above-mentioned waste paper, water and talc was charged so that the solid content concentration became 15%, and defibrated for 20 minutes. The disintegration temperature at this time is 30. C. After diluting the raw material disaggregated as described above to a solid content concentration of 3%, the crude material having a slit width of 0.4 physician is prepared. (Fine Screen, manufactured by Aikawa Iron Works). The treated ceptocept material was dehydrated and concentrated to a solid concentration of 23% (Aikawa Iron Works: Inclined extractor + screw press). This concentrated raw material is added to 5% of sodium hypochlorite and 3% of talc with respect to the absolutely dry solid content, respectively, and subjected to a dipping treatment (Aikawa Iron Works: use a disperser). went. The difference in raw material temperature before and after the kneading treatment was 10 ° C. The raw material treated as described above was heated to steam, heated to 55 ° C., and left for 120 minutes. This material was diluted again to a solid concentration of 3%. At dilution, talc was added to 296 (vs. dry solids).

This diluted raw material was treated with a screening screen (Fine Screen, manufactured by Aikawa Iron Works) equipped with a screen basket with a slit width of 0.15 mm.

After adding a surfactant (trade name: DI-610 / manufactured by Takao Corporation) comprising an additive of fatty acid ethylene oxide / propylene oxide to the accept raw material, 0.4% (based on absolute dry solid content) was added. The foam flotation treatment was performed at Flotate Ichiichi (Aikawa Iron Works: Vertical Flotter). The foam flotation treatment was repeated twice.

This treated pulp was treated with a heavy foreign matter cleaner (Aikawa Tekko: Ramo Low Concentration Cleaner) and then with a light foreign matter cleaner (Aikawa Teiko: Giroclean). Next, the pulp was washed with a drumwasher to obtain a recycled pulp.

No pressure-sensitive adhesive was found to adhere to the inside of equipment, piping, etc. throughout the above treatments. The obtained recycled pulp had a whiteness of 76%, and no pressure-sensitive adhesive or residual film was observed. In addition, as a result of preparing the recycled pulp and using the stock obtained from the platform to make a paper, no trouble occurred in soiling the wires on the paper machine.

[Example 2]

Use cast-coated paper as the surface substrate, and use A pressure-sensitive adhesive paper made by applying a silicone emulsion to glassine paper colored in heron color and applying an acrylic emulsion to this dalacin paper as pressure-sensitive welding is used as a raw material for waste paper. did. In the pulp, the above-mentioned waste paper raw material, water and talc were charged at 3% (vs. waste paper) so that the pulp concentration was 18%, and the mixture was disintegrated for 20 minutes. The disintegration temperature at this time was 40 ° C.

The pulp suspension disintegrated as described above was diluted to 3% and treated with a roughing screen (slit width 0.2 ram) of the same type as that used in Example 1. After the treatment, the acceptor pulp is concentrated to a pulp concentration of 25%, and calcium hypochlorite is added to the absolutely dry pulp at 4%, and talc is added at 3% to perform kneading. Was. At this time, the difference between the raw material temperatures before and after the kneading treatment was 8C. The raw material treated as above was left at 55 ° C for 12 minutes (1 minute. The pulp was further diluted to 2%, and at the time of dilution, bentonite was 2% (vs. absolute solids). The pulp suspension diluted as above was treated with the same type of screening screen (slit width 0.15) as used in Example 1. The accept pulp was treated with 0.1. Diluted to 8% and added 0.4% (vs. absolutely dry pulp) of a surfactant (trade name: DI-600 RZ manufactured by Kao) consisting of an adduct of oil-based ethylenoxide and buguchi pyrenoxide. The mixture was stirred while introducing air, and the foam floating separation was repeated twice.

The pulp treated in this way was treated with a heavy foreign matter cleaner (Aikawa Tekko: Rameau low concentration cleaner). This pulp was washed with a drum washer to obtain a recycled pulp.

The resulting recycled pulp was white with a Hunter whiteness of 80%, and no pressure-sensitive adhesive or residual film was observed. Furthermore, as a result of papermaking using the paper material obtained by preparing and blending this recycled pulp, no trouble occurred in soiling the wires on the paper machine. [Embodiment 3]

Cast-coated paper is used as the surface base material, glassine paper is used as the release base material, and the above-mentioned dalasin paper is coated with a siliconized base (release agent). Pressure-sensitive adhesive paper formed by applying an acryl-based emulsion, and, apart from the pressure-sensitive adhesive paper, an art paper as a surface base material and a paper laminated with a polyethylene film as a release base material were used. Except for the above, a pressure-sensitive adhesive paper in which a pressure-sensitive adhesive paper having the same configuration as above was mixed at a weight ratio of 1: 1 was used as a waste paper raw material.

The pulp concentration was adjusted to 15%, and the above pressure-sensitive adhesive waste paper, 5% water and kaolin (vs. waste paper) were charged and disintegrated for 20 minutes. The disintegration temperature at this time was 40 ° C.

The pulp suspension thus disintegrated was diluted to 3% and treated with the same type of roughing screen (slit width 0.35 mm) as used in Example 1. After the crude pulp after this treatment, the concentrated pulp is concentrated to a pulp concentration of 25%, and then sodium hypochlorite is added at 4% to the absolutely dried pulp, and 2% of olefin is added. And we did a 21 ding. The difference in raw material temperature before and after the kneading process is 10. C. The kneaded pulp was left at 55 ° C for 120 minutes. The pulp was then diluted to 2% and 2% talc (vs. dry solids) was added at the time of dilution. The pulp suspension diluted as above was treated with the same type of screening screen (slit width 0.2 mentioned) as used in Example 1. This accept pulp was diluted to 0.8%, 0.4% of the same surfactant as in Example 2 (vs. absolutely dry pulp) was added, and the mixture was stirred while introducing air, and the foam flotation treatment was performed. I went once.

The pulp treated in this way was treated with a heavy foreign matter cleaner (Aikawa Tekko Co., Ltd .: Ramo Low Concentration Cleaner) and then with a light foreign matter cleaner (Aikawa Teiko Co., Ltd .: Giroclean). Next, this pulp was washed with a drum washer to obtain a recycled pulp. The obtained recycled pulp was white with a Hunter whiteness of 79%, and the residual ratio of the pressure-sensitive adhesive was extremely low at 0.01% of the pulp. In addition, as a result of paper-making using the paper material obtained by preparing and blending the recycled pulp, no trouble occurred on the wire on the paper-making machine.

[Example 4]

Cast-coat paper is used as the surface base material, and asagi-colored dalasin paper is used as the release base material, coated with siliconized base material. This acrylic glass emulsion is used as the pressure-sensitive adhesive on this glassine paper. Ffl was used as a raw material for waste paper. To the pulp, the above-mentioned waste paper raw material, water and 3% of waste paper (vs. waste paper) were charged and the pH was adjusted to 5.0 by adding sulfuric acid so that the pulp concentration was 18%. . The disintegration temperature at this time was 40 ° C. The suspension disintegrated in this manner was diluted to 3%, and then processed using the same type of coarse selection screen (slit width: 0.35 orchid) as that used in Example 1. After the treated pulp is concentrated to a pulp concentration of 25%, sodium hypochlorite is added to the absolutely dry pulp at 4%, and 10% of bentonite is added for kneading. Was done. The difference in raw material temperature before and after the kneading was 10 ° C. The pulp subjected to the dipping treatment was left at 55 ° C for 120 minutes.

The pulp was then diluted to 2% and talc 2% (vs. dry solids) was added at the time of dilution. The diluted pulp suspension was treated with the same type of screening screen (slit width 0.2 strokes) as used in Example 1. This accept pulp was diluted to 0.8%, and the same surfactant as in Example 2 was added to 0.4% of the absolutely dry pulp, followed by stirring while introducing air to perform a foam flotation treatment.

The pulp treated in this way was treated with a heavy foreign matter cleaner (Aikawa Iron Works: Ramo Low Concentration Cleaner) and then washed with a drum washer to obtain recycled pulp. The resulting recycled pulp has a white Hunter brightness of 80%, and the residual ratio of the pressure-sensitive adhesive is extremely low at 0.02% of the pulp.There is no particular problem when paper is mixed with this pulp. Did not.

[Example 5]

Using a heat-sensitive recording paper as the surface base material, and using a high-quality cream-colored paper laminated with polyethylene as the release base material coated with a silicon compound, and using an acryl-based adhesive as a pressure-sensitive adhesive on this high-quality cream paper. A pressure-sensitive adhesive paper formed by applying an emulsion was used as a raw paper material. The above-mentioned waste paper raw material, water, calcium carbonate 4% (vs. waste paper), and sodium hydroxide 2% were added to pulp so that the pulp concentration became 15%, and the mixture was defibrated at 30 ° C for 20 minutes.

The pulp suspension disintegrated in this manner was diluted to 2.5%, and then treated with a roughing screen (slit width: 0.5 mm) of the same type as that used in Example 1. After the treated pulp was concentrated to a pulp concentration of 20%, sodium hypochlorite was added to the absolutely dry pulp at 4% and calcium carbonate was added at 2%, and the pulp was subjected to edging. The difference between the raw material temperatures before and after the kneading was six. The kneaded pulp was left at 55 ° C for 120 minutes.

Next, the pulp suspension obtained by diluting this pulp to 2% was treated with the same type of screening screen (slit width 0.15 stroke) as that used in Example 1. After diluting the accept pulp to 0.8%, the same surfactant as in Example 1 was added to the absolutely dried pulp at 0.4%, and the mixture was stirred while introducing air, and the foam flotation treatment was repeated twice. .

The pulp treated in this way was treated with a heavy foreign substance cleaner (Aikawa Tekko Co., Ltd .: Ramo Low Concentration Cleaner), and then further applied to a lightweight foreign substance cleaner (Aikawa Tekko Co., Ltd .: Giroclean). Next, the pulp was washed with a drum washer to obtain a recycled pulp.

The resulting recycled pulp has a Hunter brightness of 75%, No residual film was observed. The paper on which this recycled pulp is placed has an excellent texture and does not cause any problems such as process contamination during paper making.

;

[Example 6]

Coated paper was used for both the surface substrate and the release substrate, a hot-melt pressure-sensitive adhesive was used, and pressure-sensitive adhesive paper coated with a silicone compound as a release agent was used as a raw paper material.

The waste paper raw material, water, bentonite 5% (vs. waste paper), and sodium hydroxide 2% were charged into the pulp so that the pulp concentration was 5%, and the mixture was disintegrated for 20 minutes. The disintegration temperature at this time was 30 ° C.

The above disintegrated suspension was diluted to 2.5% and treated with a roughing screen (slit width 0.5 Sir) of the same type as in Example 1. After this treatment, the concentrated pulp was concentrated to a pulp concentration of 29%, then sodium hypochlorite was converted to absolutely dry pulp, and 4% of talc and 2% of talc were added for kneading. The difference in raw material temperature before and after the kneading was 8. The kneaded pulp was left at 55 ° C for 120 minutes. Further, a suspension obtained by diluting this pulp to 2% was treated with a screening screen (slit width: 0.2 strokes) of the same type as that used in Example 1. This accept pulp was diluted to 0.8%, the same surfactant as in Example 2 was added to 0.4% of the absolutely dried pulp, and the mixture was stirred while introducing air, and subjected to foam flotation treatment. Was repeated twice.

The pulp treated in this way was treated with a heavy foreign matter cleaner (Aikawa Iron Works: Ramo Low Concentration Cleaner) and then washed with a drum washer to obtain recycled pulp.

The resulting recycled pulp had a Hunter whiteness of 81%, a very low residual ratio of pressure-sensitive adhesive of 0.02%, and no residual film was observed. The paper prepared and distributed from this recycled pulp was excellent in ground strength, and there was no trouble such as process contamination during paper making. [Example 7]

The pressure-sensitive adhesive paper used in Example 1 and water were charged into the pulp so that the pulp concentration was 9%, the defibration temperature was maintained at 30 ° C, and the pulp was defibrated for 20 minutes. At the time of defibration, 5% of talc was added.

The disaggregated suspension was diluted to 3% and treated with the same type of roughing screen (slit width Q.4mni) as used in Example 1. After the treated pulp was concentrated to a pulp concentration of 23%, sodium hypochlorite was added to the absolutely dry pulp at 5% and talc was added to 3% for kneading. The difference in raw material temperature before and after the kneading was 2 ° C. The kneaded pulp was left at 55 ° C for 120 minutes.

Then, to the suspension obtained by diluting this pulp to 3%, 2% of talc (vs. absolutely dry pulp) was added, and the same type of screening screen as used in Example 1 (slit width 0.15 inversion) was used. ). The treated pulp was diluted to 0.8%, the same surfactant as used in Example 1 was added to 0.4% of the absolutely dried pulp, and the mixture was further stirred while introducing air to form a foam. The treatment was repeated twice.

The treated pulp was treated with a heavy foreign matter cleaner (Aikawa Tekko: Lamo, low-concentration cleaner), and then further treated with a light foreign matter cleaner (Aikawa Teiko: Giroclean). Next, this pulp was washed with a drum washer to obtain a recycled pulp.

The regenerated pulp obtained had a Hunter brightness of 76%, the residual ratio of the pressure-sensitive adhesive to the pulp was 0.03%, and no remaining foreign matter such as a film was observed.

[Embodiment 8]

High-quality paper was used as the surface substrate and glassine paper was used as the release substrate. Pressure-sensitive adhesive paper, which is a mixture of mineral paper and a 1: 2 weight ratio, was used as a raw material for waste paper. The pressure-sensitive adhesive paper had a silicone compound as a release agent, and an acrylic emulsion as a pressure-sensitive adhesive.

The above-mentioned waste paper raw material and water are charged so that the pulp concentration becomes 17% in the pulp, and 15% of art paper waste paper is added.The pH at the time of disintegration of the sulfuric acid band is 5.5. The mixture was added, and the disintegration temperature was adjusted to 35 ° C, and disintegrated for 25 minutes.

The pulp suspension thus disintegrated was diluted to 3%, and then treated with a roughing screen (slit width: 0.3 mm) of the same type as that used in Example 1. The treated acceptor pulp was concentrated to a pulp concentration of 28%, and calcium hypochlorite was added at 4% to the absolutely dry pulp and talc was added at 3% for kneading. The difference in raw material temperature before and after the kneading was 10 ° C. The pulp that had been treated was left at 55 ° C for 120 minutes.

Further, to the suspension obtained by diluting this pulp to 2%, talc was added at 2% (vs. absolutely dry pulp), and the same type of screening screen (slit width 0) as used in Example 1 was used. 2)). The treated pulp pulp is diluted to 0.8%, and the fatty acid-based surfactant 商品 (trade name: DI-260 Z㈱ manufactured by Kao) and anionic surfactant (trade name: DI — 380 0 Kao) Was added to the absolutely dried pulp at 0.4% and 0.1%, respectively, and the mixture was stirred while introducing air, and the foam flotation treatment was repeated twice.

The treated pulp is then treated with a heavy foreign matter cleaner (Aikawa Iron Works: Ramo Low Concentration Cleaner), and further treated with a light foreign matter cleaner (Aikawa Iron Works: Giro Clean). The pulp was washed with a drumwasher to obtain a recycled pulp.

The regenerated pulp obtained had a Hunter brightness of 78%, the residual ratio of the pressure-sensitive adhesive was 0.01% relative to the pulp, and no residual foreign matter such as film was observed. Ivy <

[Embodiment 9]

The pressure-sensitive adhesive paper used in Example 1 and water were charged into the pulp so that the pulp concentration was 15%, and the pulp was defibrated for 20 minutes while maintaining the defibration temperature at 30 ° C. At the time of defibration, 5% of talc was added.

After the disaggregated suspension was diluted to 3%, the suspension was treated with the same type of coarse selection screen (slit width 0.4 med.) As used in Example 1. After the treatment, the accept pulp was concentrated to a pulp concentration of 35%, and sodium hypochlorite was added to 5% of the absolutely dry pulp, and talc was added to 3% for kneading. The difference in raw material temperature before and after the kneading was 10 ° C. The kneaded pulp was left at 55 ° C for 120 minutes.

Furthermore, 2% of talc (vs. absolutely dry pulp) was added to a suspension obtained by diluting this pulp to 3%, and a screening screen (slit width 0.15) of the same type as that used in Example 1 was used. Image). The treated accept pulp was diluted to 0.8%, and the same surfactant as used in Example 1 was added to 0.4% of the absolutely dry pulp, followed by stirring while introducing air. The foam flotation was repeated twice.

Next, the treated pulp is treated with a heavy foreign matter cleaner (Aikawa Tekko: Ramo Low Concentration Cleaner) and further treated with a light foreign matter cleaner (Aikawa Tekko: Giro Clean), and the pulp is treated with a drum washer. After washing, a recycled pulp was obtained.

The regenerated pulp obtained had a Hunter whiteness of 76% and a residual ratio of the pressure-sensitive adhesive to the pulp of 0.05%, which was extremely small, and no residual foreign matter such as a film was observed.

[Example 10]

Used in Example 1 so that the pulp concentration was 15% in pulp The pressure-sensitive adhesive paper and water were charged, the defibration temperature was maintained at 30 ° C, and defibration was performed for 20 minutes.

The pulp suspension thus disintegrated was diluted to 3%, and then treated with the same type of coarse screening screen (slit width 0.5 mm) as that used in Example 1. The treated pulp was concentrated to a pulp concentration of 28%, and sodium hypochlorite was added at 5% to the absolutely dry pulp for kneading. The difference between the raw material temperatures before and after the digging was 8 ° C. The pulp that had been subjected to the edging treatment was left at 55 ° C for 120 minutes.

Further, a suspension obtained by diluting this pulp to 3% was treated with a screening screen (slit width: 0.2 form) of the same type as that used in Example 1. The treated accept pulp was diluted to 0.896, the same surfactant as used in Example 1 was added to the absolute dry valve at 0.4%, and the mixture was stirred while introducing air, and the foam was floated. Repeat the separation process twice 《~ o

The pulp treated in this way is treated with a heavy foreign matter cleaner (Aikawa Tekko:, Ramo Low Concentration Cleaner), and further treated with a light foreign matter cleaner (Aikawa Teiko: Giroclean). It was washed with mushroom to obtain recycled pulp.

The regenerated pulp obtained had a Hunter whiteness of 76%, the residual ratio of the pressure-sensitive adhesive to the pulp was 0.13%, and was extremely small, and no residual foreign matter such as film was observed. On the other hand, although some process dirt was observed during papermaking, no actual harm occurred.

[Comparative Example 1]

Recycled pulp was produced according to Example 1 except for the following points. That is, talc was not added during defibration, the pulp suspension after roughing was dewatered and concentrated so that the pulp concentration became 2896, and the difference in raw material temperature before and after kneading was maintained at 20. Examples, except for Similarly, a regeneration valve was obtained.

The pulp thus obtained had a Hunter brightness of 76%, but the pulp was yellowish. In addition, the amount of residual pressure-sensitive adhesive was as high as 0.53% of pulp, causing troubles that stained the wire of the paper machine.

[Comparative Example 2]

Recycled pulp was obtained in the same manner as in Example 1, except that the material used for the waste paper and the treatment method were the same except that the slit width of the screen used at the time of selection was 0.3.

At this time, the Hunter whiteness of the recycled pulp was 76%, and the amount of the remaining pressure-sensitive adhesive was 1.6% of the pulp.

[Comparative Example 3]

Recycled pulp was manufactured according to Example 1 except for the following points. That is, the pulp concentration at the time of defibration is 11%, the pulp concentration at the time of kneading is 25%, the temperature difference between the raw materials before and after the kneading process is 15 ° C, and the slit width on the screen at the time of selective screening is 0.2. A recycled pulp was obtained in the same manner as in Example 1 except that the pulp was changed.

The Hunter whiteness of the recycled pulp at this time was 76%, but the amount of the remaining pressure-sensitive adhesive was extremely large at 3.5% of the pulp.

[Comparative Example 4]

Recycled pulp was produced according to Example 1 except for the following points. That is, the temperature difference between the raw materials before and after the 21st digging process was set to 15 ° C, the slit width of the screen used during the selection was 0.2 mm, and the recycled pulp was not used at all in the subsequent cleaner treatment. I got _T of recycled pulp of this time ', centers whiteness was the 76%, the amount of residual pressure sensitive adhesive is extremely large as 4.5% pulp, and even film pieces were scattered [Comparative Example 5]

Recycled pulp was manufactured according to Example 1 except for the following points. That is, except that the floatation treatment was not performed at all, the slit width in the screen used in the selection was 0.2, and the temperature difference between the raw materials before and after the kneading step was set to 15 ° C. Regenerated pulp was obtained in the same manner as in Example 1. At this time, the Hunter whiteness of the recycled pulp was 76%, the amount of the residual pressure-sensitive adhesive was extremely large at 5% of the pulp, and some film fragments were observed.

[Comparative Example 6]

Recycled pulp was produced according to Example 4 except for the following points. That is, a regenerated pulp was obtained in the same manner as in Example 4, except that the acidic substance was not added at the time of disaggregation and the selective screening was performed at the time of the floatation treatment. At this time, the whiteness of the recycled pulp was 80%, and the amount of the remaining pressure-sensitive adhesive was 2% with respect to the pulp.

[Comparative Example 7]

A recycled pulp was produced in the same manner as in Example 3 except for the following. That is, kaolin is not added during disaggregation, the slit width in the screen during rough selection is set to 0.6, the solid content concentration after dehydration and concentration is 13%, and bleach is added. In addition, the temperature difference between the raw materials before and after the kneading was kept at 5 ° C, and the addition of talc during the second dilution and selection was eliminated. Recycled pulp was obtained with only one configuration. At this time, the Hunter whiteness of the recycled pulp was 73%, the amount of the residual pressure-sensitive adhesive was as high as 3.5% of the pulp, and many pieces of film were found. In addition, the process was stained during papermaking. [Comparative Example 8]

A recycled pulp was produced in the same manner as in Example 3 except for the following. That is, no violin was added at the time of disaggregation, the slit width at the screen during rough selection was 0.6 orchid, and the accept material was diluted to a solid concentration of 2%, and then the slit width was reduced to 0%. . Selected in the second screen. After that, the pulp was dehydrated and concentrated to 25%, and the absolutely dried pulp was added with 4% of sodium hypochlorite and 2% of kaolin as a bleaching agent, and subjected to edging. The temperature difference between the raw materials before and after the kneading was kept at 5 ° C, and at the time of the second dilution disaggregation, the addition of talc was omitted and the floatation treatment was repeated twice to obtain recycled pulp. At this time, the whiteness of the recycled pulp was 78%, and the amount of the residual pressure-sensitive adhesive was relatively small at 0.5% with respect to the pulp. However, process stains were observed during papermaking. Tables 1 to 5 summarize the above Examples and Comparative Examples in a list.The Table shows the properties of the recycled pulp obtained by the formulations of the Examples and Comparative Examples, and the properties of the pulp. The state of foreign matter remaining in the pulp was described, and the state of paper making using the pulp was also described.

(Hereinafter the margin)

553 Table 1

¾¾¾Example 1 Difficult example 2 No example 3 Example 4 Surface base material Cast coat paper Cast coat paper Cast coat paper, art paper Cow cast coat paper Acryl-based acryl-based acryl-based acryl-based exfoliation Cream) Glassine paper (Asaki '> Kurashio> Rirami Glassine paper (Asaki')

(1: 1)

Pal t f

15% solids 鰣 18% solids female 15% solids content 18% talc 5% talc 3% kaolin 5% talc 3% C 20 minutes

pH 5.0 Addition dilution Dilution Solid content 3% Solid separation 3% Solid separation 3% Solid content 3% Day 0, 4 mm 0.2 mm 0, 35 mm 0.35 mm Experiment Solid content Nada 23% Solid separation 25% solids ¾Κ25% solids separation 25% bleached NaClO 5% Ca (C10) 2 4% NaClO 4% NaClO 4% talc 3% talc 3% kaolin 2% bentonite 2% Difficult

10 C 8 ° C 1 o ° c 1 o ° c Solid wisteria 3% Solid wedge 2% Muscle 2% Solid fibre 2% Talc 2% Pentonite 2% Talc 2% Talc 2% mm 0.15 mm 0.2 mm 0.2 mm Surfactant 麵 DI-610 0.4¾ DI-600R 0.4¾ DI-600R 0.4¾ DI-600R 0.i% Flotation 2 stages 2 stages 1 stage 1 stage Cleaner 1 mm / mm mm / —— m / for weight Z wash 〇〇〇パル Pulp quality

Pulp white 76% 80% 79% 80% Residual return agent (vs./"Huff 0% 0% 0.01¾ 0.02% Film (;

Number)

None None None None Table 2 Male example 5 Difficult example 6 Difficult example 7 Case example 8 Surface base material Coated paper Cast coat paper Top-leafing agent Acryl-type hot-menoleto Acryl-type Acryl-type Exfoliated Holif Mi-paper Kurazin: Ho Rirami

(1: 2) Palpy b

醒 Awakening 15% Solids zg 5% Optional; ί Minutes ί§Κ 9% Solids arrowhead 17%

Charcoal 4% Bentonite 5% Talc 5% Art paper ¾S 15 30 ° C. 20 minutes 30 ° C, 20 minutes 30 ° C, 20 minutes 35 ° C, 25 minutes

NaOH 2¾ NaOH 2¾ pH 5.5½Λ 'Associate Solid content 2.5% Solid separation 2.5% Phosphor separation 3% Disruption 3% View 0.5 mm 0.5 mm 0.4 mm 0.3 mm Rise 20% solid Separation 29% Solids 23% Competitive 28% Bleached NaClO 4% NaClO 4% NaClO 5% Ca (C10) 2 4%

Coal power 2% Talc 2% Talc 3% Talc 3% Mechanical kneading Kneading Kneading Kneading Raw material 6 ° C 8 ° C 2 ° C 10 ° C Dilution Solid separation 2% Solids boat 2% Solid separation 3% Solid content 2% Talc 2% Talc 2% Talc 2% 0.15 mm 0.2 mm 0.15 mm 0.2 mm Interfacial activity DI-610 0.4¾ DI-600E 0.4¾ DI-610 0.4¾ D 260 260%

DI-380 0.1¾ Flotation 2-stage 2-stage 2-stage 2-stage Cleaner mm / m mm / —— mm / mm Washing 〇〇〇〇 Pulp quality

Pulp brightness 75%. 81% 76% 78% Residual crane (vs. ') 0% 0.02% 0.03¾ 0.01% Film (; in rwiKg 0 0 0 0

Number)

None None None None Difficult example 9 Difficult example 10 Surface base material Cast coat paper Cast coat paper Adhesive Acryl Acryl

d

Stripped Poly Rami Paper (Cream) Poly Rami Paper (Cream) Pulp IB

Solid: 15% Solid 15% Talc 5%

30 ° C, 20 minutes 30 ° C, 20 minutes

F Separation Solid separation 3% Solid content 3% fraction 0.4 mm 0.5 mm Agar fiber Solid separation 35% Solid separation 28% Bleached NaClO 5% NaClO 5% Talc 3%

Spectacular sculpture Kneading Uding Raw material 1 o. c 8 ° C Dilution Solid separation 3% Solid content 醣 3% Talc 2%

Selected 0.15 mm 0.20 mm Surface activity DI-610 0.4¾ DI-610 0.4¾ Flotation 2 stages 2 stages

Cleaner mm / mm Heavy rope ^ Sffi Cleaning 〇〇

Pulp quality

Pulp Brightness 76% Residual Adhesive (vs./ ・・ 7 ・ 0.13% Film (Λ ・ lf'g / g

Number)

Slightly Table 4 Female example 1 mm 2 Female example 3 Surface base material Cast coated paper Cast coated paper Cast coated paper Cast coated paper Adhesive Acryl Acrylic Acrylic Acrylic Abrasion Poly-Lami Paper (Cream) Poly-Lami Paper (Cream) Poly-Lami Paper (Cream) Pulp i

/ on> jm .ο ί) 1 ϋ S 0o Talc 5% Talc 5% Talc 5% 30 ° C 20 minutes 30 ° Cs 20 minutes 30C 20 minutes 30 ° C 20 minutes

βΕΠΐ ^ 0 / Difficult 0.4 mm 0. mm 0. mm 0, 4 mm Supplementary separation 28% Separation key 25% Solid separation 23% Bleached NaClO 5% NaClO 5% NaClO 5% NaClO 5% Gnolec O Ϊ »Tanolek d% Tanolek d% Tanolek ό i¾

Raw material-20 C 10 ° C 15 ° C 15 ° C Dilution Separated chicks 3% 黻 3% solids ¾S 3% Solids passing 3% Tanolek 2% Tanolek 2 i¾ Tanolek 25½ Tanolek 2%

0.15 mm 0.30 mm 0.20 mm 0.20 mm Field activity DI-610 0.4¾ DI-610 0.% DI-610 0.4¾ DI-610 0.4¾ Flotation 2 stages 2 stages 2 stages 2 stages

Cleaner mm / mm mm / m mm / mm

Cleaning 〇〇〇〇

Pulp Poor

Pulp white 76% 76% 76% 76% Residual agent (vs. ') 0.53% 1.6% 3.5% 4.5% Film (in A'WlKg 0 0 0 10

Number)

Yes No No No Table 5 Example 5 m 6 m 7 Example 8 Cast Coat Cast Co., Ltd .: Paper, Art Translation; Text, Paper] -H Crane Acryl Acrylic Acrylic Acrylic Acrylic Exfoliation Polyrami Paper (Cream) Darashin ア Razin ψ · Rirami Ku 'Razin ** Rirami

(1: 1) (1: 1) Pulp

Gei Oki Boat 15% Sun Female 18% Oki 15% Master Boat 15% Talc 5% Talc 3%

30 and 20 minutes. 40 and 20 minutes 40 ^e C, 20 and 40 minutes, 20 minutes Dilution Special boat 3% @ 5g boat 3% Special offer 3% 纷 Enemy 3%

0, 4 mm 0.35 mm 0.60 mm 0.60 mm Akira Ogata 23% Negative 25% @ @ Separation 13% Noodle 2% Bleached NaClO 5% NaClO 4% JiaCLO 4% Talc 3 % Bentonite 2% Kaolin 2% Kaolin 2% Mechanical Kneading Kneading Kneading Kneading

15 ° C 10. C5. C5. C: Oki female 3% Sun offering 2% Talent 2% Talc 2% Talc 2%

m 0.20 mm 0.2 mm 0.2 mm

0.2 mm

DI-610 0.4¾ DI-600R 0.4¾ DI-600E 0.i%

DI-600R 0.%

Flotation 1 stage 2 stages

One step.

Cleaner m / —

mm / \

'Wash 净〇〇 o

〇

Pulp quality

Pulp white 75% 73% 78% Residual crane (vs. 7 7) 5.0% 80% 1 3.5% 0.5% Film (Λ 2.0 ⁷ 2

Number) 0!

No Yes i

Yes As described above, according to the present invention, it is possible to recycle pulverized pressure-sensitive adhesive paper, which has been avoided in the past, and to recycle the obtained reclaimed pulp. The paper has a good texture and has no trouble in paper making. Industrial applicability

As described above, according to the present invention, a recycled pulp can be produced using waste paper of pressure-sensitive adhesive paper, which could not be processed except for disposal as a main material, in the past. The industrial applicability is extremely large from the viewpoint of protection and prevention of pollution of the global environment.

(Hereinafter the margin)

Claims

The scope of the claims

1. In the pulping method for obtaining recycled pulp from waste paper of pressure-sensitive adhesive paper, (1) after disintegrating the waste paper, (2) diluting the coagulated suspension, and (3) the slit width of the diluted solution is 0. After roughing treatment with a screen of less than 5 rounds, ④ The pulp suspension (accept raw material) after roughing treatment is dewatered and concentrated to a solids concentration of 15 to 40% by weight. The above-mentioned mechanical stirring treatment is performed under the condition that the temperature difference of the raw material during mechanical stirring of the concentrated raw material (before and after edging) is 12 ° C or less, and the obtained raw material is diluted again. The diluted solution is carefully screened with a screen having a slit width of 0.2 or less, then a surfactant is added to the obtained accept raw material, and the mixture is stirred while introducing air to form a foam flotation treatment ( -Flotation treatment), and a cleaner for heavy foreign matter and Or lightweight foreign matters for chestnut - was subjected to a cleaner treated with Na, pulping method of the pressure-sensitive adhesive sheet paper which is characterized in that the ⑩ cleaning process.

2. The method of claim 1 wherein the solid content of the pulp suspension after the roughing treatment is 15 to 30% by weight.

3. The method of claim 1, wherein the solid content concentration of the pulp suspension after the roughing treatment is 2 (! To 25% by weight). 2. The method of claim 1, wherein said raw material is subjected to a mechanical stirring treatment, and wherein 1-50% by weight of an inorganic pigment is added to said raw material.

5. The method according to claim 1, wherein the surfactant used in the step of the foam flotation separation treatment is a fatty acid-based or oil-based ethylene oxide / propylene oxide adduct or fatty acid stone as a main component. Recycled pulping of waste pressure-sensitive adhesive paper.

6. mechanical stirring process at the same time bleaching to paragraph 1 no claims for reproducing pulping process _c of the pressure-sensitive adhesive sheet used paper according to any one of the fifth term

7. The method of claim 6, wherein the bleaching agent used for the bleaching treatment is sodium hypochlorite and calcium hypochlorite.

8. The pressure-sensitive adhesive paper according to any one of claims 1 to 6, wherein an acidic substance is added to the waste paper of the pressure-sensitive adhesive paper in a process of deagglomerating waste paper containing dalacin paper as release paper. Recovered paper pulping method.