JPH09330000A - Image stripping solution and method for regenerating image holding support using the same - Google Patents

Abstract

(57) An object of the present invention is to provide an image peeling liquid capable of peeling an image with a smaller amount and without causing wrinkles, and a method for regenerating an image holding support using the peeling liquid. SOLUTION: A stripping solution containing water for peeling an image by heating after being attached to an image holding support having an image formed by a heat-melting or thermoplastic image forming substance, which is water-soluble. 20% by weight or more of a water-soluble surfactant and a solubilizing agent for dissolving or dispersing the surfactant in water, or a surfactant having an HLB value of 14 or more and an HLB value of less than 14 An image stripping solution containing a surfactant, and the stripping solution is held in an amount of 0.1 to less than 1 g per image holding support A4 size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a method for regenerating an image holding support, in which an image holding support holds a peeling liquid containing water, and the image peeling member is heated and brought into contact therewith to peel off the image. The present invention relates to an image stripping solution and a method for regenerating an image holding support using the stripping solution.

[0002]

2. Description of the Related Art Due to the recent increase in OA, printer paper and copying paper have been used in large amounts, which has caused a problem of deteriorating the global environment. Conventionally, to solve this problem, the only method is to remove the ink or the like from the used paper, dissociate the paper, make the paper again, and recycle the paper to be used paper.

However, recently, there have been proposed some methods of removing a character image on a used paper by cleaning and reusing it for copying or printing (for example, JP-A-4-67043 and JP-A-1). -1
No. 01576, Japanese Patent Application Laid-Open No. 1-101577, and Japanese Patent Application Laid-Open No. 7-13383). Among them, Japanese Patent Laid-Open No. 7-1
The method disclosed in Japanese Patent No. 3383 is a method for taking an image formed on a large amount of commonly used copy paper, printer paper, or the like, which has no problem in use environment and has less paper damage. Is the preferred method.

That is, according to this method, an image peeling liquid containing water is held on an image holding support such as a copy paper on which a hydrophobic image made of a heat-flexible ink such as toner is formed on the surface of a paper layer, and the image peeling is carried out. This is a method of regenerating an image-bearing support in which the hydrophobic image is peeled from the paper-like layer by heating the hydrophobic image and the image peeling body in a liquid-holding state.

[0005]

However, there are still points to be improved in carrying out this method. That is,
When the copy image paper (image holding support) is immersed in the image peeling liquid, the image peeling liquid is usually consumed in an amount of 3 to 5 g per copy image paper A4 size, so that power is required for drying and wrinkles are easily generated. Is a problem. The present invention has been made in view of such a situation, and it is possible to perform image peeling with a smaller amount, and an image peeling liquid that does not cause wrinkles, and a method for reproducing an image holding support using the peeling liquid. The challenge is to obtain.

[0006]

In order to solve the above-mentioned problems, the present invention is as follows. First, at least the image forming surface is composed of a paper-like layer containing cellulose fibers as a main component, and the surface of the paper-like layer is heat-meltable. Or a stripping solution containing water for adhering to an image-bearing support having an image formed of a thermoplastic image-forming substance and then peeling the image by heating, wherein 20 wt% of a water-soluble surfactant is used. % Or more and a solubilizing agent for dissolving or dispersing the surfactant in water is provided.

Secondly, in the image stripping solution described in the above-mentioned first, an image stripping solution in which the surfactant has a solubility parameter (SP value) of 10.6 or more and 14.0 or less is provided.

Thirdly, in the image stripping solution according to the first or second aspect, the solubilizing agent is a water-soluble organic solvent having an SP value within ± 1.0 of the SP value of the surfactant. An image stripper is provided.

Fourthly, in the image stripping solution described in the above first, second or third, image stripping containing a hydrophilic polymer having an SP value of 11 or more as a stabilizer for dissolving or dispersing the surfactant. Provide liquid.

Fifth, in the image stripping solution described in the fourth, the hydrophilic polymer is polyvinyl butyral,
Provided is an image stripping solution which is at least one selected from the group consisting of polyester, polyvinyl alcohol and polycellulose acetate.

Sixth, an image bearing having at least an image forming surface of a paper-like layer containing cellulose fibers as a main component, and having an image formed on the surface of the paper-like layer with a heat-meltable or thermoplastic image-forming substance. In the method for regenerating an image-bearing support, in which an image peeling solution containing water is held on a support, and then the image is peeled and removed by bringing the image peeling body into contact with the image holding support by heating, An image stripping solution for holding any of the image stripping solutions described in the fifth in an amount of 0.1 to less than 1 g per image holding support A4 size.

Seventh, an image bearing having at least an image forming surface composed of a paper-like layer containing cellulose fibers as a main component, and having an image formed on the surface of the paper-like layer with a heat-meltable or thermoplastic image-forming substance. A peeling liquid containing water for peeling an image by heating after being attached to a support, wherein a surfactant having an HLB value of 14 or more and an HLB value of 1
An image stripping solution containing a surfactant having a ratio of less than 4 is provided.

Eighth, in the image stripping solution described in the seventh, there is provided an image stripping solution in which the concentration of the surfactant is 20% by weight or more.

Ninth, the image stripping solution according to the seventh or eighth aspect, wherein the surfactant having an HLB value of 14 or more is a dialkylsulfosuccinate having an HLB value of 14 or more. .

Tenth, in the image stripping solution according to the seventh or eighth, there is provided an image stripping solution in which the surfactant having an HLB value of less than 14 is a nonionic surfactant having an HLB value of less than 14. To do.

Eleventh, there is provided an image stripping solution according to the tenth aspect, wherein the nonionic surfactant is a compound obtained by adding ethylene oxide to polypropylene glycol.

Twelfthly, an image having at least an image forming surface composed of a paper-like layer containing cellulose fibers as a main component, and having an image formed on the surface of the paper-like layer with a heat-melting or thermoplastic image-forming substance. In a method of regenerating an image-holding support, the image-releasing solution containing water is held on the holding support, and then the image is peeled and removed by bringing the image-peeling body into heat contact with the image-holding support. Or a method for regenerating an image-holding support, wherein any one of the image stripping solutions described in the above eleventh item is held for each image-holding support A4 size of 0.1 to less than 1 g.

Hereinafter, the present invention will be described in detail. The present inventors have studied an image peeling liquid which can peel off an image on an image holding support with a small amount and which does not cause wrinkles. As a result, an aqueous solution having a thicker surfactant concentration is suitable for the purpose, and The present invention has been completed by discovering that a desired image stripping solution can be obtained if a concentrated surfactant is dissolved or uniformly dispersed in water.

[0019]

According to the constitution described in the above first, since the image stripping solution having a higher surfactant concentration than that of the conventional one is used, a high image stripping rate can be obtained with a small amount of stripping solution per unit area. Since a highly soluble surfactant and a surfactant solubilizer are used, an image stripping solution in which a high concentration of 20% of a surfactant is dissolved or uniformly dispersed can be obtained, and uniform image stripping can be achieved. You can do it.

According to the second to fifth structures, a surfactant having a high water solubility is used, and a solubilizer having a high affinity for the surfactant-a water-soluble organic solvent, and further Since the hydrophilic polymer is used, the dissolution or uniform dispersion of the high-concentration surfactant can be further improved.

According to the sixth aspect, the image peeling is performed using a small amount of the image peeling liquid containing the high-concentration surfactant described above, and therefore the image peeling is performed without generating wrinkles on the image holding support. Image holding support A
Since a smaller amount of the stripping solution of less than 1 g per 4 sizes is used, the amount of electric power required for drying the stripping solution can be significantly reduced.

According to the seventh aspect, the HLB is
By using a surfactant having a value of 14 or more, an image peeling liquid having a high image peeling rate can be obtained, and therefore, the amount of the image peeling liquid used can be reduced.
Since the surfactant having the HLB value of less than 14 is added to the surfactant having the LB value of 14 or more, a water-soluble stripping solution can be obtained even if the surfactant concentration is increased.

According to the eighth aspect, even if the concentration of the surfactant is increased to 20% by weight or more, since the surfactant having the HLB value of less than 14 is contained, the water-soluble exfoliation is obtained. As a result, a liquid can be obtained, so that the amount of the image peeling liquid used can be reduced.

According to the ninth aspect, the HLB is
Among the surfactants having a value of 14 or more, those having a better image peeling property are used, so that the image can be peeled with a smaller amount of the peeling liquid. Further, according to the nonionic surfactant described in the tenth, even if the surfactant having an HLB value of less than 14 has excellent water solubility, a high-concentration surfactant having an HLB value of 14 or more is dissolved in water. Therefore, the amount of the image peeling liquid can be further reduced. The nonionic surfactant described in the eleventh aspect is particularly excellent in water solubility.

According to the structure described in the twelfth aspect, a small amount of the image peeling liquid containing the surfactant having high releasability is used, and a small amount of the surfactant having high releasability is used at high concentration. Since image peeling is performed by using the image peeling solution, wrinkles do not occur on the image holding support, and the amount of the image peeling solution is less than 1 g per one sheet of the image holding support A4. It is possible to significantly reduce the amount of electric power required for.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION The surfactant used in the first to sixth structures may be any of nonionic, anionic and cationic surfactants.
In order to contain a high concentration of a surfactant, one having a high water solubility should be used, and particularly, an SP value of 10.6 to 1
It is preferable to use the one of 4.0. That is, SP
If the value is less than 10.6, the solubility in water is poor, while if it is more than 14.0, the affinity for the toner is insufficient and sufficient and uniform peeling cannot be performed. Table 1 shows examples of such a surfactant. The calculated SP value shown in the table was estimated by the Fedors method, that is, from the total value of the evaporation energy (e) and the molar volume (v) of the atomic group of the compound, according to the following equation 1.

[0027]

## EQU1 ## SP value = (ΔE / ΔV) ^1/2 = (ΣΔe / PΔv) ^1/2

[0028]

[Table 1]

(Note) In the table, compound NO. 9-11 (P
OE) n represents the n number of polyoxyethylene. In addition, the compound NO. (C :) of 3 to 7 represents the carbon number of the alkyl group.

As the solubilizing agent for the surfactant used in the present invention, the SP value is within ± 1.0 of the SP value of the surfactant in order to bring the surfactant into a dissolved state or a uniform dispersed state as an aqueous solution. That is, a water-soluble organic solvent having a high affinity with the surfactant used is effective. Table 2 shows specific examples of such water-soluble organic solvents.

[0031]

[Table 2]

The above-mentioned water-soluble organic solvent alone, or it has an affinity with the surfactant, that is, SP
A hydrophilic polymer having a value of 11 or more is used. Table 3 shows specific examples of such hydrophilic polymers. In Tables 2 and 3, the SP values are shown together with the literature values (Chemical Handbook) and the calculated values obtained in the same manner as above.

[0033]

[Table 3]

Next, as an example of the surfactant having an HLB value of 14 or more, which is used in the constitution described in the seventh to twelfth aspects, sodium dodecyl sulfate (HLB = 40),
There are sodium oleate (HLB = 18), sodium dialkylsulfosuccinate (HLB = 14 to 38) and the like. Among them, sodium dialkylsulfosuccinate has good toner releasability.

As an example of sodium dialkylsulfosuccinate, all of the aerosol type surfactants manufactured by Mitsui Cytec are anionic type surfactants having an HLB value of 14 or more, but aerosol OT and aerosol TR which are particularly excellent in image releasability are It does not dissolve at a concentration of 20% or more. Further, even the aerosol MA and the aerosol AY, which have relatively good solubility in water, do not dissolve at a concentration of 40% or more.

However, when a surfactant having an HLB value of less than 14 is added to these aerosol type surfactants having an HLB value of 14 or more, a transparent or translucent uniform aqueous solution can be obtained. Nonionic surfactants are particularly effective. Specifically, specifically, nonipol series (nonionic surfactants obtained by adding ethylene oxide to nonylphenol) manufactured by Sanyo Kasei Co., Ltd., nonipol soft series (ethylene oxide added to higher alcohols) The added nonionic surfactant) and Newpol PE series (nonionic surfactant obtained by adding ethylene oxide to polypropylene glycol) are effective (see Examples 16 to 22 below).

Above all, the above-mentioned New Pole PE series becomes a uniform aqueous solution with a smaller addition amount ratio, and is particularly effective (see Examples 16, 18, 21, and 22 below). Also,
As shown in Comparative Examples below, a transparent or translucent uniform aqueous solution cannot be obtained by the combination of the aerosol ATR, the aerosol OT, and the aerosol MA in the same row, and even if the toner is forcibly peeled by the stripping solution, it is not uniform Only peeling results are obtained (see Comparative Examples 6 to 7 below).

Further, an aerosol surfactant having an HLB value of 14 or more and a nonionic surfactant having an HLB value of 14 or more, for example, Nonipol 200 (HLB = 16.0), is transparent or translucent. Although a uniform aqueous solution was obtained, the toner peeling rate was rather poor (see Comparative Example 8 below).

It is not known why these mixed systems are stable in a concentrated aqueous solution, but anionic surfactants alone cannot form sufficient hydrophilic micelles (aggregates of surfactants) in an aqueous solution. On the contrary, it is considered that a nonionic surfactant having a small HLB value becomes a nucleus and an anionic surfactant having a large HLB value is adsorbed around the nonionic surfactant to form a more stable micelle. In particular, Newpol PE series (nonionic surfactant obtained by adding ethylene oxide to polypropylene glycol) has a larger molecular weight than other surfactants (molecular weight 300 to 1000) and can form larger micelles. It is thought to be because.

Among the HLB values of 14 and above shown in Table 4, anionic surfactants having excellent releasability and HLB values of 14 which show effective water solubility when added to these surfactants having HLB values of 14 and above. Examples of less than nonionic surfactants are shown below.

[0041]

[Table 4]

[0042]

EXAMPLE FIG. 1 shows an image peeling test apparatus. In the figure, an image holding support P having a hydrophobic image formed of a thermoplastic or thermosoftening image forming substance is sent to a liquid supplying section via a paper feeding roller and a guide plate, and there, by an applying roller R2. The image peeling liquid 2 is applied to the image forming surface.

The image holding support P coated with the image peeling liquid 2 is opposed to the conveying roller R1 and the conveying roller R1 containing a heating element, the peeling belt 1 which is rotated by being supported by the supporting roller and the elastic roller. The heating element that rotates in contact with the peeling belt 1 at a position is nipped between the image peeling roller R3 and the image peeling roller R3, and is conveyed while being heated. During this period, the image forming substance on the image holding support P is peeled from the image holding support P by the permeation of the image peeling liquid 2 and heated, and transferred onto the peeling belt 1.

The temperature of the image peeling roller R3 is about 140.degree.
The temperature of the carrying roller R1 is about 100 ° C., and the feeding speed of the image holding support P is about 20 mm / sec. The image forming substance transferred to the peeling belt 1 is removed by the cleaning member while the peeling belt 1 is rotating. The image-holding support P from which the image-forming substance has been removed is separated from the peeling belt 1 and conveyed onto a drying roller having a heating element incorporated therein to be dried.

[Examples 1 to 15 and Comparative Examples 1 to 5] Images containing a surfactant having an SP value in a specific range shown in Tables 5 to 9 below using the peel tester shown in FIG. The results of the image peeling test with the peeling liquid are shown in Tables 5 to 9 above. As the image holding support P, a copy paper (Ricoh P
A copy image paper image-formed on a PC paper type 6200) was used.

[0046]

[Table 5]

[0047]

[Table 6]

[0048]

[Table 7]

[0049]

[Table 8]

[0050]

[Table 9]

From Tables 5 to 9, SP value of 10.6 or more and 14.0
According to the image peeling liquid containing 20% by weight or more of the water-soluble surfactant having the following, the toner peeling ratio is 95 to 100 even if the liquid adhesion amount is 0.1 to less than 1 g per A4 size sheet.
It turns out that% is obtained.

[Examples 16 to 22 and Comparative Examples 6 to 8] The peeling test apparatus shown in FIG.
HL included in each of the two specified ranges shown in 2.
Tables 10 to 12 show the results of an image peeling test using an image peeling liquid containing two kinds of surfactants each having a B value. As the image holding support P, a copy paper (PP made by Ricoh, PP made by Ricoh FT6960) is used.
A copy image paper image-formed on C paper type 6200) was used.

[0053]

[Table 10]

[0054]

[Table 11]

[0055]

[Table 12]

From Tables 10 to 12, according to the image peeling liquid having a surfactant concentration of 20% by weight or more in which a surfactant having an HLB value of 14 or more and a surfactant having an HLB value of less than 14 were simultaneously contained, the liquid adhesion amount A4 was obtained. It can be seen that a toner peeling rate of 95 to 100% can be obtained even when the size is 0.1 to less than 1 g.

[0057]

INDUSTRIAL APPLICABILITY As described above, according to the image peeling liquid of the present invention and the method of regenerating an image holding support using the same, an A4 image is formed on an image holding support such as copy image paper on which a hydrophobic image such as toner is formed. A hydrophobic image can be removed and reproduced on a copy sheet by applying an image stripping solution of less than 1 g per size and heating.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a peeling test apparatus used in Examples and Comparative Examples.

[Explanation of symbols]

 1 Peeling belt 2 Image peeling liquid P Image holding support (paper) R1 Opposing roller R2 Coating roller R3 Image peeling roller

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[Table 5]

[Table 6]

[Table 7]

[Table 8]

[Table 9]

[Table 10]

[Table 11]

[Table 12]

Claims (12)

[Claims] 1. An image-bearing support having at least an image-forming surface composed of a paper-like layer containing cellulose fibers as a main component, and having an image formed on the surface of the paper-like layer with a heat-meltable or thermoplastic image-forming substance. It is a stripping solution containing water for peeling an image by heating after adhering to the surface of a water-soluble surface active agent, and 20% by weight or more of a water-soluble surface active agent and a surfactant for dissolving or dispersing the surface active agent in water. An image stripping solution containing a solubilizer. 2. The surfactant is 10.6 or more and 14.0 or more.
The image peeling liquid according to claim 1, which has the following solubility parameter (SP value). 3. The image stripping solution according to claim 1, wherein the solubilizing agent is a water-soluble organic solvent having an SP value within ± 1.0 of the SP value of the surfactant. . 4. The image stripping solution according to claim 1, wherein a hydrophilic polymer having an SP value of 11 or more is contained as a stabilizer for dissolving or dispersing the surfactant. 5. The hydrophilic polymer is at least one selected from the group consisting of polyvinyl butyral, polyester, polyvinyl alcohol and polycellulose acetate.
The image peeling liquid according to claim 4, which is a seed. 6. An image-bearing support having at least an image forming surface composed of a paper-like layer containing cellulose fibers as a main component, and having an image formed on the surface of the paper-like layer with a heat-meltable or thermoplastic image-forming substance. An image peeling liquid is retained in an image peeling liquid, and then the image peeling member is heated and brought into contact with the image holding support to peel and remove the image.
A method for regenerating an image-holding support, characterized in that any one of the described image stripping solutions is held in an amount of 0.1 to less than 1 g per image-holding support A4 size. 7. An image-bearing support having at least an image forming surface formed of a paper-like layer containing cellulose fibers as a main component, and having an image formed on the surface of the paper-like layer with a heat-meltable or thermoplastic image-forming substance. A stripping solution containing water for stripping an image by heating after being attached to a HL
An image stripping solution comprising a surfactant having a B value of 14 or more and a surfactant having an HLB value of less than 14. 8. The image peeling liquid according to claim 7, wherein the concentration of the surfactant is 20% by weight or more. 9. The image stripping solution according to claim 7, wherein the surfactant having an HLB value of 14 or more is a dialkylsulfosuccinate having an HLB value of 14 or more. 10. The image stripping solution according to claim 7, wherein the surfactant having an HLB value of less than 14 is a nonionic surfactant having an HLB value of less than 14. 11. The image stripping solution according to claim 10, wherein the nonionic surfactant is a compound obtained by adding ethylene oxide to polypropylene glycol. 12. An image-bearing support having at least an image-forming surface composed of a paper-like layer containing cellulose fibers as a main component, and having an image formed on the surface of the paper-like layer with a heat-meltable or thermoplastic image-forming substance. An image peeling liquid is retained in an image peeling liquid, and then the image peeling member is heated and brought into contact with the image holding support to peel and remove the image. The image peeling liquid of any one of
A method for regenerating an image-bearing support, characterized in that the size of each sheet is held at 0.1 to less than 1 g.