JPH10337964A - Apparatus and method for manufacturing double-sided recording image receiving sheet, and double-sided recording image receiving sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a double-sided recording image receiving sheet to be put to a practical use by ensuring equality of the same degree or more than prior art. SOLUTION: The apparatus for manufacturing a double-sided recording image receiving sheet comprises first, second coating means 20, 21, and first, second fixing means 22, 23. The means 20 coats one surface of a base mateal sheet 7 with powder paint composition. The means 21 coats the other surface of the sheet 7 with powder paint composition. The means 22 fixes the composition coated by the means 20. The means 23 fixes the composition coated by the means 21. Further, the means 22 heats at high temperature than a melting point of offset inhibitor contained in the composition. The means 23 heats at a temperature higher than melting point of resin and lower than the melting point of the inhibitor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A double-sided recording paper receiving apparatus and method according to the present invention and a double-sided recording paper are provided in accordance with the present invention.
Apparatus and method for producing double-sided recording image receiving paper for thermal transfer used in an image forming method for forming an image by thermal transfer, and double-sided recording image receiving paper, in particular, uncertainty of image receiving called white void It is an object of the present invention to provide a double-sided recording image receiving paper in which the problem is prevented and a method and apparatus for manufacturing the same.

[0002]

2. Description of the Related Art With the advancement of so-called personal computers and office computers, printing machines (printers) capable of printing images created on these computers in full color have become widespread. When printing (printing out) a color image created by the various computers described above, a thermal transfer type printer is often used. Hereinafter, this thermal transfer method will be briefly described.

The above-mentioned thermal transfer printer is a type in which an ink sheet is melted by the heat of a head and transferred to a dedicated paper (image receiving paper), and is broadly classified into a fusion type thermal transfer system and a sublimation type thermal transfer system. The above-mentioned fusion type thermal transfer method heats an ink sheet,
This is to transfer the melted ink to paper. In the case of this method, it was difficult to increase the resolution due to the influence of heat applied to each dot on the print head. There has been known a type in which the thermal stability is improved, the temperature of the head can be easily controlled, and the resolution can be increased.

On the other hand, in the above-mentioned sublimation type thermal transfer system, heat is applied to an ink sheet containing a sublimable dye as a main component, and the vaporized dye reacts with a polyester resin constituting an image receiving layer on a special paper (image receiving paper). And transfer. In the case of this method, the gradation can be expressed in dot units by adjusting the heating amount. While the sublimation type thermal transfer method can express gradations in dot units, dots printed by the fusion type thermal transfer method have a constant size and density.

[0005] In the above ink sheet, for example, a dye layer is formed on a support such as a polyethylene terephthalate film (coating). On the other hand, paper (image receiving paper) to be printed by the sublimation type thermal transfer system is configured as follows. That is, on a base paper such as a Shintsu paper or a synthetic paper, or a synthetic resin sheet, an image receiving layer composed of a resin layer in which the dye of the ink sheet can diffuse or move, and the image receiving layer formed of the image receiving layer and the ink sheet. And a release layer for preventing fusion and having releasability. The image receiving layer is formed by applying a coating composition obtained by dissolving a modified silicone oil in an organic solvent together with various resins including a saturated polyester resin on a base paper such as the synthetic paper and drying the coating composition. I have. The release layer is formed by subjecting the image receiving layer to heat treatment at a high temperature (100 ° C. or higher) so that silicone oil bleeds on the surface of the image receiving layer and is cured.

[0006] Further, as a paint constituting the image receiving layer,
Conventionally, liquid materials were applied to the base paper, but for example,
A configuration in which powder is used as the paint is conceivable, and is actually used. Further, there is known a technique in which the image receiving paper is made white as in the case of ordinary plain paper by making the powder white. In addition, the image receiving paper manufactured by using the powder coating in this manner, even if it is a sublimation type thermal transfer type or a fusion type thermal transfer type,
Can be used for both.

FIG. 2 shows an outline of an apparatus for manufacturing the above-mentioned known image receiving paper. The apparatus includes a base paper supply unit 1, a developing unit 2, a transfer unit 3, a fixing unit 4,
And a discharge unit 5. The base paper supply unit 1 includes:
It has a pair of rollers and a conveying means. The base paper on which the image receiving layer has not yet been formed is conveyed to the transfer unit 3 by the conveying means via the above pair of rollers. As the transport means,
For example, a conventionally known roller or belt can be used.

The developing section 2 includes a paint storage section 8 (see FIG. 3).
, A developing sleeve, a blade, and a dot latent image forming device. Among these constituent members, the paint storage unit 8 stores the powder paint 9 (see FIG. 3). That is, in the case of the structure of this example, the powder is used as the paint as described above. As described above, advantages of using the powder coating 9 include simplification of the manufacturing process and cost reduction. In the case of a production method in which a solution paint is applied to a base paper, a number of steps such as an application step, a drying step, and a release layer forming step are required. On the other hand, in the case of the manufacturing method using the powder coating material 9, the manufacturing process can be simplified, and as a result, the manufacturing cost can be reduced. In the case of the illustrated example, the powder coating 9 is a white powder coating in order to make the completed image receiving paper white like the plain paper. The developing sleeve is supplied with the white powder coating. The blade controls the thickness of the white powder coating applied to the developing sleeve. The tot latent image forming device transfers a white powder from a developing sleeve. As an example, as shown in FIG.
A charging drum 6 made of a photosensitive member;
A laser beam is applied to the surface of the device to draw a scattered latent image.

[0009] The above-mentioned white powder coating is disclosed in, for example, Japanese Patent Application Laid-Open
As described in JP-A-224970, it is configured to include a thermoplastic resin, a white pigment (white coloring material), and various waxes (offset preventing agents). The above-mentioned offset preventing agent is provided in order to improve the releasability of the above-mentioned resin and a roller which constitutes a fixing unit (fixing portion) described later. That is, since the molten offset preventing agent spreads over the interface between the roller and the resin, the releasability is improved, and the resin to be adhered to the base paper is prevented from adhering to the roller. Since the composition of such a white powder is described in the above-mentioned publication, a detailed description is omitted.

In the developing section 2, the white powder paint adhered to the surface of the charging drum 6 moves to the transfer section 3 as shown in FIG. In the transfer section 3, a charge having a polarity opposite to that of the white powder paint is given to the back surface of the base paper 7 (the surface opposite to the surface to which the white powder paint is adhered, the lower surface in FIG. 3). The body paint is transferred to the base paper 7 in a scattered manner by electrostatic force. In the developing section 2, the white powder coating 9 remaining on the charging drum 6 even after the transfer to the base paper 7 is removed. This removal step is performed by, for example, a known cleaner unit. The base paper supply unit 1, the development unit 2, and the transfer unit 3 constitute a coating unit.

The base paper 7 to which the white powder coating material 9 has been transferred by the transfer unit 3 is transported to the fixing unit 4 by transport means. As shown in FIGS. 4 and 5, this fixing section is composed of a fixing roller 12 including one pair of rollers 10 and 11. The pair of rollers 10 and 11 can press and heat the base paper 7 freely. When the base paper 7 passes through the pair of rollers 10 and 11, the white powder coating material 9 transferred onto the base paper 7 is pressed and heated and melted to form the image receiving layer 13. You. Thus, the image receiving layer 1
The base paper 7 on which 3 is formed is discharged by the discharge section 5. In the fixing section 4, the offset preventing agent contained in the white powder is also melted by the heating. By the melting of the offset preventing agent, the offset preventing agent spreads over the interface between the roller and the resin, and the releasability is improved. As a result, the resin to be attached to the base paper is prevented from attaching to the roller. Therefore, the temperature at the time of the heating is controlled by the white powder coating 9 containing the anti-offset agent.
Is controlled to a temperature at which it can be melted.

As the fixing system in the fixing section 4, various configurations other than those shown in FIGS. 4 and 5 are known.
At present, the mainstream is a so-called heat roll fixing system using heat and pressure as shown in the figure. This is because the thermal efficiency is high, the safety is high, and a stable fixing property can be obtained. To further explain the structure of the heat roll fixing system, as shown in FIG. 5, a heater 14 is provided inside the upper roller 10, and the base paper 7 can be heated by the heater 14. As the heater 14, for example, a heater using a halogen lamp can be adopted. The lower roller 11 is
It is urged toward the upper roller 10 by an elastic material (not shown) or the like to press the base paper 7. By these heating and pressurizing, the white powder coating 9 is fixed on the base paper 7. In FIG. 5, reference numeral 15 denotes a thermistor for controlling the fixing temperature, reference numeral 16 denotes a thermoswitch, and reference numeral 17 denotes a separating claw for preventing the base paper 7 from winding.

A double-sided recording image receiving paper for thermal transfer is manufactured by using the above-described apparatus. Then, it is cut into a predetermined size in a final step, and is further wrapped in a predetermined number of sheets and sent to the market. Such an image receiving paper for double-sided recording is mounted on a thermal transfer type printer or the like, and an image or the like created by a computer or the like is printed in full color.

The present applicant has previously considered an image receiving paper manufacturing apparatus, a method for manufacturing the same, and an image receiving paper which can eliminate the adverse effect of the offset preventing agent during image reception. The invention ahead is
The heating temperature of the heating means is higher than the melting point of the resin and lower than the melting point of the offset preventing agent. The reason for such a configuration is as follows. That is, the offset preventing agent is used to improve the releasability between the roller on the powder application surface side and the paint melted by heating. In other words, the anti-offset agent melts and spreads around the contact point between the roller and the white powder coating composition, thereby improving the releasability. The offset preventing agent is melted by the heating by the heating means and diffuses over the entire surface of the base paper 7, and is cooled after completion of the heating (after passing through the rollers) in this state. It's all over. However, such an evenly distributed offset preventing agent is
In actuality, when an image or the like is transferred to the image receiving paper by a thermal transfer type printer, ink deposition is deteriorated. This is true of either the fusion type thermal transfer type or the sublimation type thermal transfer type. That is, in the case of the fusion type thermal transfer system, the bonding force between the ink and the image receiving layer is weakened by the evenly distributed offset preventing agent. In the case of the sublimation type thermal transfer system, the diffusivity of the ink to the image receiving layer is deteriorated by the evenly distributed offset preventing agent. Therefore, at the time of the fixing, the heating temperature is set in the above range so that the resin, which is the main component of the white powder coating composition, is melted and the offset preventing agent is not melted.

As described above, by setting the heating temperature of the heating means higher than the melting point of the resin and lower than the melting point of the anti-offset agent, the resin is melted and the entire surface of the base paper 7 is melted. On the other hand, the anti-offset agent does not melt much and is mixed as a powder in the image receiving layer, so that the adverse effect of the anti-offset agent can be eliminated.

[0016]

By the way, the image receiving paper manufactured as described above is an image receiving paper for single-sided recording in which an image receiving layer is formed only on one side (one of the front and back surfaces). . In general, if such an image receiving paper for single-sided recording is used, practical inconvenience is not felt. However, in order to effectively use the image receiving paper and reduce running costs, the image receiving paper capable of recording on both sides thereof is used. The development of is desired. It seems that such an image receiving paper for double-sided recording can be manufactured in principle using the above-described apparatus. That is, it is conceivable that the image receiving layer is formed on one surface (front surface) of the base paper as the image receiving paper as described above, and then the image receiving layer is formed on the other surface (back surface) in the same manner. Furthermore, it is considered that an image receiving paper for double-sided recording that can reliably receive an image can be obtained by using the above-described technique of the invention.

However, when the image receiving layer is formed on one side and the other side of the base paper by using the above-described structure of the present invention, the image receiving layer on one side of the base paper which has been subjected to the fixing operation is formed. The anti-offset agent melts again during the fixing operation on the other side, and the anti-offset agent spreads evenly on the one side. That is, when the image receiving layers are formed on both sides of the base paper, even if the diffusion of the anti-offset agent is formed so as not to hinder the transfer of the image by using the above-described structure of the present invention, the fixing work is first performed. The above-mentioned offset preventive agent spreads evenly on the surface side on which is applied, and the above-mentioned inconvenience cannot be prevented. Of course, when performing the fixing operation on both sides of the base paper using the conventional structure that does not use the prior invention structure, in any fixing operation, heating is performed at a temperature higher than the melting point of the offset preventing agent. The anti-offset agent spreads evenly on both sides of the paper. The inconvenience of such an even distribution of the anti-offset agent is as follows.
As described above, image reception on any side of the image receiving paper becomes uncertain.

Further, when applying the technique of the prior invention, when the fixing operation is performed later, the fixing operation performed first is
The anti-offset agent on one side of the base paper is not evenly spread over the surface. As a result, the releasability between the roller and the image receiving layer on the one side is poor during the subsequent fixing operation on the other side of the base paper, and the image receiving layer on the one side is destroyed during the second fixing operation. Will be done. As described above, if the previously fixed image receiving layer is destroyed, the image cannot be received on the surface with high quality when the image is actually recorded by the printer, and it does not make sense.

It is also conceivable to perform the fixing operation on both sides of the base paper at one time in order to eliminate the trouble of the fixing operation over twice. However, in order to enable high-quality image reception in which white spots are prevented, the fixing roller 1
Since it is necessary to use a so-called hard roller as the roller on the powder coating application side of the pair of rollers, when adopting a structure in which both sides of the base paper are fixed at a time, both of the pair of rollers are hardened. Must be a roller. With this configuration, as will be described later, the number of white spots increases as a result, and it is not possible to achieve high quality image reception. In other words, the simultaneous fixing method cannot be adopted.

The apparatus and method for manufacturing a double-sided recording paper according to the present invention and the double-sided recording paper have been devised in view of the above-described circumstances, and eliminate the adverse effects of an offset preventing agent during image reception. It is an object of the present invention to provide a double-sided recording image receiving paper manufacturing apparatus and a method for manufacturing the same, and to provide a double-sided recording image receiving paper capable of receiving an image while eliminating an adverse effect of an offset preventing agent.

[0021]

According to the present invention, there is provided an apparatus and a method for manufacturing a double-sided image receiving paper according to the present invention. As described above, on both surfaces of the base paper, a powder coating composition comprising at least a resin and an offset preventing agent having a melting point higher than the melting point of the resin, which constitutes the image receiving layer, is applied and further fixed. The present invention relates to an image receiving paper manufacturing apparatus for double-sided recording. In the apparatus for manufacturing an image receiving paper for double-sided recording according to claim 1, the first coating means for applying the powder coating composition to one surface of the base paper, and the first coating means for applying the powder coating composition. Fixing the powder coating composition by pressing and heating, a first fixing unit, and a second coating unit for coating the powder coating composition on the other surface of the base paper, A second fixing means for fixing the powder coating composition applied by the second applying means by applying pressure and heat. Then, the first fixing means heats at a temperature higher than the melting point of the offset preventing agent contained in the powder coating composition, and the second fixing means heats the offset preventing substance at a temperature higher than the melting point of the resin. It is characterized by heating at a temperature lower than the melting point of the agent.

Since the double-sided recording paper receiving apparatus manufacturing apparatus according to the present invention is configured as described above, the image receiving layer is formed on both the front and back surfaces of the base paper without fail, and a sufficiently practical double-sided recording is realized. Image receiving paper can be obtained. Incidentally, in the image receiving layer on one side of the base paper on which the fixing operation is performed first, since the offset preventing agent spreads evenly, although the quality of the image receiving layer on the other side is slightly inferior, Practical quality can be ensured. Such a receiving paper for double-sided recording, which has at least the same quality as that of the currently known single-sided recording paper, is sufficiently available for practical use and has not been known until now. In addition, a double-sided recording type image receiving paper can be provided.

Further, among the two-sided recording paper receiving apparatus and method according to the present invention and the two-sided recording paper,
The invention relating to the method for manufacturing a double-sided recording image receiving paper, as described in claim 9, comprises an image receiving layer on both sides of the base paper,
The present invention relates to a method for producing an image receiving paper for double-sided recording, in which a powder coating composition comprising at least a resin and an offset preventing agent having a melting point higher than the melting point of the resin is applied and further fixed. In the method for manufacturing a duplex image receiving paper according to claim 9, a first step of applying the powder coating composition to one surface of the base paper, and a powder applied by the first step. A second step of fixing the coating composition by pressing and heating, a third step of applying the powder coating composition to the other side of the base paper, and a powder applied by the third step A fourth step of fixing the coating composition by pressing and heating. And
The second step is heated at a temperature higher than the melting point of the anti-offset agent contained in the powder coating composition, the fourth step is higher than the melting point of the resin and lower than the melting point of the anti-offset agent. It is characterized by heating at a temperature.

Since the method for manufacturing the image receiving paper for double-sided recording according to the present invention is configured as described above, the image receiving layer is formed on one side and the other side of the base paper without fail, and the image receiving layer is sufficiently formed. Practical double-sided recording image receiving paper can be obtained.

Further, among the two-sided recording paper receiving apparatus and the method for producing the same according to the present invention, among the two-sided recording papers, the invention relating to the two-sided recording paper is as described in claim 17. A powder coating composition comprising a resin as its main component and an anti-offset agent having a melting point higher than the melting point of the resin is applied to both surfaces of the resin,
Furthermore, the present invention relates to a double-sided recording image-receiving paper comprising the powder coating composition fixed on both sides of a base paper. In such a double-sided recording image receiving paper according to claim 17, a heating means is provided inside one of the rollers, and the heating temperature of the heating means is set to the above. It is characterized by being subjected to a fixing step which is higher than the melting point of the resin and lower than the melting point of the offset preventing agent.

Since the double-sided recording image-receiving paper according to the present invention is constructed as described above, the image-receiving layer is securely formed on one side and the other side of the base paper, and is sufficiently practical. It can be used as an ideal double-sided recording image receiving paper.

[0027]

Next, an embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a main part of an image receiving paper manufacturing apparatus for double-sided recording according to the present invention.
In addition, this invention, the first provided at two positions each,
Second coating means 20, 21 and first and second fixing means 2
In particular, the first and second fixing units 22 and 23 of 2 and 23
Has a feature in the structure of
This is the same as the conventional structure described above. Therefore, the description of the same parts as those of the above-described conventional structure will be omitted or simplified, and the following description will focus on the features of the present invention.

The apparatus for manufacturing an image receiving paper for double-sided recording according to this embodiment includes on both sides of the base paper 7 at least a resin constituting an image receiving layer and an offset preventing agent having a melting point higher than the melting point of the resin. The present invention relates to a double-sided recording paper receiving apparatus for applying and further fixing a powder coating composition composed of In the apparatus for manufacturing a double-sided recording image receiving paper according to this embodiment, the first coating means 20 for coating the powder coating composition on one surface of the base paper 7, and the first coating means 20 Fixing the powder coating composition applied by pressing and heating, the first fixing means 22,
A second application unit 21 for applying the powder coating composition to the other surface of the base paper 7, and applying pressure and heating to the powder coating composition applied by the second application unit 21. And a second fixing unit 23 for fixing.
Each of the first and second application units 20 and 21 can be configured in the same manner as the above-described conventional structure, or in the same manner as other known conventional structures. The powder coating composition contains a white pigment. The one surface of the base paper 7 refers to the surface on which the powder coating composition is applied by the first applying means 20,
The other surface of the base paper 7 refers to the surface on which the powder coating composition is applied by the second application unit 21.

The first fixing means 22 is provided with the base paper 7
A pair of rollers 24 and 25 pressurizing by sandwiching
And a pair of rollers 2
A first heating means (heater) provided inside a roller 25 provided on the other surface side of the base paper 7 among the base papers 4 and 25;
And The second fixing unit 23 includes a second fixing roller 29 composed of a pair of rollers 27 and 28 that presses the substrate paper 7 by sandwiching the same, and a second fixing roller 29 of the pair of rollers 27 and 28. A second heating means (heater) provided inside a roller 28 provided on one surface side of the base paper 7.

The roller 24 provided on one surface side of the base paper 7 of the pair of rollers 24 and 25 constituting the first fixing roller 26 and the second fixing roller 29 constitute the second fixing roller 29. Among the pair of rollers 27 and 28, the roller 27 provided on the other side of the base paper 7 is a hard roller. As a member for constituting the hard roller as described above, a fluorine-based resin such as perfluoroalkoxy resin (PFA) or polytetrafluoroethylene resin (PTFE) can be preferably used. Specifically, an aluminum alloy pipe material coated with PFA or PTFE can be used. As the shape, a columnar or cylindrical straight shape, a crank shape, and an inverted crank shape can be adopted. The thickness of the PFA or PTFE is 0.2 to
1.0 mm (preferably, 0.2 to 0.5 mm).
The roller 25 provided on the other surface of the base paper 7 among the pair of rollers 24 and 25 constituting the first fixing roller 26 and the pair of rollers 24 constituting the second fixing roller 29. Of the rollers 27 and 28, the roller 28 provided on one surface side of the base paper 7 is a soft roller.
This soft roller is filled with silicon rubber, and is configured by coating the surface with a thin film of a perfluoroalkoxy resin (for example, PFA or PTFE). The use of an aluminum alloy as the tube material and the shape-related points are the same as those of the rollers 24 and 27 described above. The thickness of the silicon rubber is not particularly limited, but is preferably thinner, for example, 0.3 to 1.0 mm. The thickness of the thin film is 0.3 to 1.0 mm (preferably 0.3 to 0.5 mm). However, this thin film is not always necessary. The hardness of such rollers 25 and 28 is 50 degrees to 90 degrees (preferably 70 degrees to 90 degrees).

In the case of the present embodiment configured as described above, the first fixing means 22 is at a temperature higher than the melting point of the offset preventing agent contained in the powder coating composition (for example, 145 degrees Celsius). ), And the second fixing means 23 heats at a temperature (for example, 120 degrees Celsius) higher than the melting point of the resin and lower than the melting point of the anti-offset agent. The first and second heating means for performing such heating are provided on the rollers 25 and 28 constituting the fixing rollers 26 and 29, respectively. As the first and second heating means, specifically, conventionally known various heaters such as a halogen lamp can be employed as in the above-described conventional structure. When the fixing speed is high (the passing speed of the base paper 7 is high), a pre-heat treatment using an infrared lamp or the like may be performed before the fixing step. Further, a calendar process may be performed after the fixing process.

[0032] The powder coating composition contains a resin as its main component and an anti-offset agent. As the resin, for example, JP-A-8-112974
As described in Japanese Patent Application Laid-Open No. H08-157, a saturated polyester resin, a polyamide resin, a polyacrylate resin and the like may be used alone or as a mixture of two or more kinds, and resins other than the above-mentioned resins may be employed. As a specific example,
As the above-mentioned saturated polyester resin, for example, “Byron RV200” (trade name) manufactured by Toyobo Co., Ltd. can be preferably used. In the present embodiment, a white colorant is contained in the powder coating composition. As the white colorant, titanium oxide, tin oxide, or the like can be preferably used. Such a white powder composition is usually blended in a range of 0.5% by weight to 15% by weight.

In the structure of the present embodiment, the heating temperature of the first heating means is set to the melting point of each of the resin and the anti-offset agent (for example,
Higher than 150 degrees Celsius) (for example, 1
55 °), and the heating temperature of the second heating means is higher than the melting point of the resin (for example, the melting start temperature is 102 ° C., the melting completion temperature is 140 ° C.), and the melting point of the anti-offset agent is (For example, 150 degrees Celsius) (for example, 120 degrees Celsius as described above).
When a plurality of resins are mixed, it is inevitable that the melting point has a width. Therefore, each of the above heating temperatures is
The decision is made in consideration of this.

The reason why each of the rollers 24 and 27 is a hard roller is as follows. That is, in order to prevent the white spots at the time of recording, the image receiving layer must be uniformly formed on the entire surface of the base paper 7 (the entire surface of one side surface and the other side surface) without any gap. As in the present embodiment, if the rollers 24 and 27 located on the surface side on which the powder coating composition is applied are hard rollers, due to the effect of concentrated load on the convex portion of the fiber array of the base paper 77, The white powder composition is crushed and diffused at this portion. As a result, the white powder composition is fixed on the entire surface of the base paper 7 as compared with the case where the rollers 24 and 27 located on the side where the powder coating composition is applied are soft rollers, and the image receiving layer is formed. It is reliably formed on the entire surface of the paper. Therefore, the above-described white portion does not occur during printing, and high-quality printing can be achieved. still,
The above-mentioned convex portion will be briefly described. The surface shape of the base paper 7 cannot be completely horizontal, and there are convex portions and concave portions. The convex portion of the fiber arrangement refers to a convex portion among such inevitable irregularities. In addition, the concave portion of the fiber array described later also refers to the concave portion of the concave and convex portion.

The reason why the rollers 25 and 28 located on the side on which the powder coating composition is not applied are soft rollers is as follows. That is, as described above, the rollers 24, 27 located on the surface side on which the powder coating composition is applied are hard rollers, so that the rollers 25, 25 on the other surface side,
If 28 are also hard rollers, these rollers 24, 25
Since the contact area between the rollers 27 and 28 is small (narrow), it is difficult to crush and diffuse the white powder composition present in the concave portions of the fiber arrangement of the base paper 7 at this portion. On the other hand, if the rollers 25 and 28 located on the side on which the powder coating composition is not applied are soft rollers as in the structure of the present embodiment, a pair of rollers 24 can be formed by the elasticity of the soft rollers. , 25 and the pair of rollers 27, 28, the contact area is expanded, and the effect of crushing and diffusing the white powder composition present in the concave portion at this portion is improved. For this reason, as described above, the rollers 25 and 28 located on the side on which the powder coating composition is not applied are soft rollers.

Further, the first and second heating means are connected to the roller 2 located on the side on which the powder coating composition is not applied.
The reason for providing them at 5, 28 is as follows. That is, in order to prevent the white spots at the time of recording, the image receiving layer must be uniformly formed on the entire surface of the base paper 7 without any gap as described above. For this purpose, it is necessary to reliably fix the white powder coating to the base paper 7. By the way, when the heating by the heating means is performed from the powder application surface side, the joining surface between the base paper 7 and the powder is in the state most separated from the heating means, so that the base paper 7 and the powder The amount of heating acting on the joining surface portion is small, and the melting of the portion is the slowest. As a result, the function of fixing after melting is incomplete, and there is a possibility that reliable fixing cannot be achieved. On the other hand, in the case of the present embodiment in which the heating by the heating means is performed from the side opposite to the powder application surface, the bonding surface between the base paper 7 and the powder is closest to the heating means. The amount of heating acting on the joint surface portion between the paper 7 and the powder increases, and the portion is melted the fastest. As a result, the function of fixing after melting is completely performed, and reliable fixing can be achieved. For this reason, in the present embodiment, the heating by the heating means is performed from the side opposite to the powder application surface.

Further, the heating temperature of the second heating means is
The reason why the melting point is higher than the melting point of the resin and lower than the melting point of the anti-offset agent is as follows. That is, the offset preventing agent is applied to the roller 27 on the powder application surface side.
Is used to improve the releasability of the coating material heated and melted. That is, since the offset preventing agent is melted and spreads around the contact point between the roller 27 and the white powder coating composition, the releasability is improved. The anti-offset agent is melted by the heating by the second heating means and diffuses over the entire surface of the base paper 7, and is cooled after the completion of heating (after passing through the rollers) in this state. It goes all over the surface. However, such an evenly distributed offset preventing agent deteriorates the ink deposition when an image or the like is actually transferred to the double-sided recording image receiving paper by a thermal transfer type printer. This is true of either the fusion type thermal transfer type or the sublimation type thermal transfer type. That is, in the case of the fusion type thermal transfer system, the bonding force between the ink and the image receiving layer is weakened by the evenly distributed offset preventing agent. In the case of the sublimation type thermal transfer system, the diffusivity of the ink to the image receiving layer is deteriorated by the evenly distributed offset preventing agent. Therefore, at the time of the fixing, the heating temperature is set in the above range so that the resin, which is the main component of the white powder coating composition, is melted and the offset preventing agent is not melted.

As described above, by setting the heating temperature of the second heating means higher than the melting point of the resin and lower than the melting point of the offset preventing agent, the resin melts and becomes While diffusing over the entire surface of the paper 77, the anti-offset agent does not melt so much and is mixed as a powder in the image receiving layer, so that the adverse effect of the anti-offset agent can be eliminated. The first heating means heats at a temperature higher than the melting point of the offset preventing agent.
The reason for this is that by forming a thin film of an offset preventing agent on the image receiving layer fixed by the first fixing unit 22, the releasability of the second fixing unit 23 during the fixing operation is improved. In this case, the reliability of the transfer at the time of image recording is almost the same as that of the conventional product, but at a level that does not cause any practical problem. Further, the surface fixed by the second fixing means 23 can be reliably transferred and the quality can be expected to be improved, similarly to the surface obtained by the above-mentioned prior invention. Therefore, one side is almost the same as the conventional one, but the other side can obtain a high-quality double-sided recording paper.

In FIG. 1, reference numeral 30 denotes the wound base paper 7.
Reference numeral 31 denotes a recoiler for winding the completed double-sided recording image receiving paper. Also, code 3
2, 33 and 34 are guide rollers. In the case of the present embodiment, the image receiving paper for double-sided recording wound by the recoiler 26 is
After being sent separately to a cutting facility and cut into a desired size and shape, it is packaged in predetermined numbers and put on the market.

When a double-sided recording type image-receiving paper is manufactured using the double-sided recording image-receiving paper manufacturing apparatus according to this embodiment configured as described above, the following operation is performed. That is, a first step of applying the powder coating composition to one surface of the base paper 7 by the first coating means 20, and applying the powder coating composition applied in the first step to the first step. A second step of fixing by applying pressure and heat by a fixing roller 26 of the above, a third step of applying the powder coating composition to the other surface of the base paper 7 by the second applying means 21, And a fourth step in which the powder coating composition applied in the third step is fixed by pressing and heating by the second fixing roller 29. The second step is, as described above, heating at a temperature higher than the melting point of the offset preventing agent contained in the powder coating composition, and the fourth step is offset higher than the melting point of the resin. Heat at a temperature below the melting point of the inhibitor.

In the case of the present embodiment, the direction of the base paper 7 pulled out from the pair of rollers during the pressing step constituting the second step and the fourth step is changed by fixing each of the base paper 7 The direction is substantially perpendicular to the direction of drawing into the means 22, 23. This is because pressing and heating can be performed for a little longer time so that fixing is sufficiently performed.

The double-sided recording paper manufactured by the above-described method using the double-sided recording paper manufacturing apparatus configured as described above can be used on one side or the other side of the base paper 7. Also, the image receiving layer can be reliably formed, and a sufficiently practical image receiving paper for double-sided recording can be obtained. In the image receiving layer on one side of the base paper 7 on which the fixing operation is performed first, the offset preventing agent is evenly distributed, and thus is the same as the currently known single-sided recording image receiving sheet. However, this is a practically acceptable level, but the image receiving layer on the other side of the base paper 7 can ensure the same quality as that of the above-mentioned invention. Such a receiving paper for double-sided recording, which has at least the same quality as that of the currently known single-sided recording paper, is sufficiently available for practical use and has not been known until now. Further, an image receiving paper for double-sided recording can be provided.

[0043]

Since the apparatus and method for manufacturing a double-sided recording paper according to the present invention are configured as described above, the image-receiving layer is provided on either one side or the other side of the base paper. It is possible to obtain a double-sided recording paper that is formed reliably and is sufficiently practical. Therefore, the image receiving paper for double-sided recording, which has not been known until now, is capable of receiving high quality images without white spots on one side and securing the quality on the other side as well as the conventional practical level. , Can be manufactured. Further, the image receiving paper manufactured by the manufacturing apparatus and the manufacturing method according to the present invention, one side of which is capable of receiving high quality images without white spots, and the other side has the same level of quality as conventional, It is fully practical.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a main part of an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional structure.

FIG. 3 is a schematic side view showing the configuration of a transfer unit.

FIG. 4 is a schematic side view showing a configuration of a fixing unit.

FIG. 5 is an enlarged schematic side view showing the fixing roller taken out.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base paper supply section 2 developing section 3 transfer section 4 fixing section 5 discharge section 6 charging roller 7 base paper 8 paint storage section 9 powder paint 10 roller 11 roller 12 fixing roller 13 image receiving layer 14 heater 20 first coating Means 21 Second coating means 22 First fixing means 23 Second fixing means 24, 25, 27, 28 Roller 26 First fixing roller 29 Second fixing roller

 ──────────────────────────────────────────────────の Continuing from the front page (72) Fumio Matsui Inventor, Pioneer Corporation General Research Center, 6-1-1-1 Fujimi, Tsurugashima-shi, Saitama

Claims (19)

[Claims] 1. A powder coating composition comprising at least a resin and an offset preventing agent having a melting point higher than the melting point of the resin, which constitutes an image receiving layer, is applied to both sides of a base paper; A two-sided recording image receiving paper manufacturing apparatus for further fixing, wherein: a first application means for applying the powder coating composition to one surface of the base paper; and a powder applied by the first application means. A first fixing unit for fixing the coating composition by pressing and heating, a second applying unit for applying the powder coating composition to the other surface of the base paper, and a second applying unit. And a second fixing means for fixing the powder coating composition applied by the means by pressing and heating, wherein the first fixing means comprises the offset contained in the powder coating composition. Heating at a temperature higher than the melting point of the inhibitor, The second fixing means heats at a temperature higher than the melting point of the resin and lower than the melting point of the anti-offset agent, the double-sided recording receiving paper manufacturing apparatus. 2. The fixing device according to claim 1, wherein the first fixing unit includes a first fixing roller including a pair of rollers that presses the base paper by sandwiching the base paper, and a first fixing roller including the base paper of the pair of rollers. A first heating means provided inside a roller provided on the surface side, wherein the second fixing means comprises a pair of rollers for pressing by sandwiching the base paper. 2. The double-sided surface according to claim 1, further comprising: a roller; and a second heating unit provided inside a roller provided on one surface side of the base paper of the pair of rollers. 3. Recording paper receiving device manufacturing equipment. 3. The method according to claim 1, wherein the direction of the base paper pulled out from the pair of rollers constituting the first fixing means is substantially perpendicular to the direction in which the base paper is drawn into the fixing section. 3. The apparatus for manufacturing a double-sided recording image receiving paper according to claim 2, wherein: 4. A roller provided on one surface side of a base paper of a pair of rollers constituting the first fixing roller;
The roller of at least one of a pair of rollers constituting the second fixing roller and a roller provided on the other surface side of the base paper is a hard roller. The duplex paper receiving paper manufacturing apparatus according to claim 2. 5. The apparatus according to claim 4, wherein said hard roller is made of a perfluoroalkoxy resin. 6. A roller provided on the other surface side of the base material paper among a pair of rollers constituting the first fixing roller;
A soft roller, wherein at least one of a pair of rollers constituting the second fixing roller and a roller provided on one surface side of the base paper is a soft roller. An apparatus for manufacturing an image receiving paper for double-sided recording according to any one of claims 2 to 5. 7. The double-sided soft roller according to claim 6, wherein the soft roller is filled with silicone rubber and has a surface coated with a thin film of perfluoroalkoxy resin. Recording paper receiving device manufacturing equipment. 8. The double-sided recording paper receiving apparatus according to claim 1, wherein the powder coating composition contains a white pigment. 9. A powder coating composition comprising at least a resin and an offset preventing agent having a melting point higher than the melting point of the resin, which constitutes an image receiving layer, is applied to both surfaces of the base paper; A method for manufacturing a two-sided recording image-receiving paper further fixing, wherein a first step of applying the powder coating composition to one surface of the base paper, and a powder coating composition applied in the first step. A second step of fixing by applying pressure and heat; a third step of applying the powder coating composition to the other side of the base paper; and a powder coating composition applied by the third step. A fourth step of fixing by applying pressure and heat, wherein the second step is heating at a temperature higher than the melting point of the offset preventing agent contained in the powder coating composition, the fourth step Is higher than the melting point of the resin A method for producing a double-sided recording image receiving paper, comprising heating at a temperature lower than the melting point of the anti-gating agent. 10. The pressing step of pressing the base paper by sandwiching the base paper with a first fixing roller including a pair of rollers, and the base paper of the pair of rollers. A heating step by a first heating means provided inside a roller provided on the other surface side, wherein the fourth step is performed by a second identification roller composed of a pair of rollers. And a heating step by a second heating means provided inside a roller provided on one surface side of the base paper of the pair of rollers. The method for producing an image receiving paper for double-sided recording according to claim 9, wherein: 11. The method according to claim 11, wherein the direction of the base paper pulled out from the pair of rollers during the pressing step constituting the second step is a first direction with respect to a drawing direction of the base paper into the fixing section. 11. The method according to claim 10, wherein the direction is substantially perpendicular to a side on which the heating unit is provided. 12. The second step is performed using a first fixing roller having a hard roller as a roller provided on one surface side of the base paper of the pair of rollers. 12. The method according to claim 10, wherein the fixing is performed using a second fixing roller having a hard roller as a roller provided on the other surface of the base paper of the pair of rollers.
The method for producing an image receiving paper for double-sided recording according to any one of the above. 13. The method for producing an image receiving paper for double-sided recording according to claim 12, wherein the hard roller is made of a perfluoroalkoxy resin. 14. The method according to claim 4, wherein the second step is performed by using a first fixing roller having a soft roller as a roller provided on the other side of the base paper of the pair of rollers. 14. The method according to claim 10, wherein the fixing is performed using a second fixing roller having a soft roller as a roller provided on one surface side of the base paper of the pair of rollers.
The method for producing an image receiving paper for double-sided recording according to any one of the above. 15. The double-sided soft roller according to claim 14, wherein the soft roller is filled with silicon rubber and the surface thereof is coated with a thin film of perfluoroalkoxy resin. Manufacturing method of recording paper. 16. The powder coating composition according to claim 9, wherein the powder coating composition contains a white pigment.
A method for manufacturing an image receiving paper for double-sided recording according to any one of the above. 17. A powder coating composition comprising a resin as a main component thereof and an offset preventing agent having a melting point higher than the melting point of the resin is applied to both sides of a base paper, A double-sided recording image receiving paper in which the powder coating composition is fixed on both sides of a base paper, wherein the heating means is provided inside one of the rollers and is constituted by a pair of rollers. And a fixing step in which the heating temperature of the heating means is higher than the melting point of the resin and lower than the melting point of the anti-offset agent. 18. The image receiving paper for double-sided recording according to claim 17, wherein the powder coating composition contains a white pigment. 19. The melting point of the resin is lower than the respective heating temperatures in the fixing operation on one side of the base paper and the fixing operation on the other side, and the melting point of the offset preventing agent is as described above. 18. The heating method according to claim 17, wherein the heating temperature is lower than the heating temperature in the fixing operation on one side of the base paper and higher than the heating temperature in the fixing operation on the other side.
An image receiving paper for double-sided recording according to any one of claims 18 to 18.