JP4768249B2 - Cylindrical curing mold for forming polyimide cylindrical cured film from demolded polyamic acid cylindrical coating film, and method for producing polyimide cylindrical cured film using the same - Google Patents

Description

The present invention is a polyimide cylindrical curing used as an intermediate toner carrier (transfer belt) in an electrostatic copying apparatus such as a copying machine, a printer, a facsimile machine, etc., from a demolded polyamic acid cylindrical coating film (polyamic acid cylindrical film). The present invention relates to a cylindrical curing mold for forming a film (polyimide acid cylindrical film) and a method for producing a polyimide cylindrical cured film using the cylindrical curing mold .

  Endless belts used as intermediate toner carriers in electrostatic copying machines require properties such as heat resistance, tensile strength, bending strength, etc. Properties such as heat resistance, tensile strength, bending strength, etc. It is made of an excellent resin. Such a cylindrical cured film used as an endless belt is manufactured by forming a cylindrical coated film from a synthetic resin solution by a centrifugal coating method, and subsequently subjecting the cylindrical coated film to heat curing treatment ( Patent Document 1).

  FIG. 3 is a longitudinal cross-sectional explanatory view showing a method of forming a cylindrical coating film by a conventional centrifugal coating method, wherein (a) shows a state in which a cylindrical coating film is formed on the release layer, and ( b) shows a state in which the cylindrical coating film is dried by touch and released. As shown in FIG. 3, the centrifugal coating method is a resin solution by means of spray coating or the like on the release layer 102 formed on the inner surface of a cylindrical mold 101 made of aluminum, brass, stainless steel or the like that rotates at high speed. The cylindrical coating film 103 having a uniform film thickness is formed by spreading the coating solution in the axial direction by the centrifugal force. The cylindrical coating film 103 formed by the centrifugal coating method in this way is dried and solidified and, if necessary, cured and then taken out from the cylindrical mold to form an endless belt.

  Polyimide resin is a resin excellent in properties such as heat resistance, tensile strength, bending strength, electrical insulation, etc., and thus is suitably used as a material for an endless belt of an electrophotographic apparatus. However, since the polyimide resin is a resin that can be used as an adhesive because of its good adhesiveness, it cannot be directly molded by a centrifugal coating method to form a polyimide endless belt. For this purpose, conventionally, for example, a solution of polyamic acid, which is a polyimide precursor, is centrifugally applied to a cylindrical mold such as stainless steel to form a cylindrical coating film, and then this cylindrical coating film is touch-dried. The polyimide endless belt is manufactured by curing, that is, imidization. The polyamic acid solution is obtained, for example, by solution polymerization of two monomers consisting of pyromellitic anhydride and 4,4′-diaminodiphenyl ether in a polar solvent such as dimethylformamide.

According to this centrifugal coating method,
(1) The adjustment of the thickness of the cylindrical coating film can be arbitrarily adjusted by the amount of the resin solution applied to the cylindrical mold,
(2) The material efficiency is good because only the required amount of the resin solution needs to be centrifugally applied to the cylindrical mold.
(3) Since the inside of the cylindrical mold is a closed space, when removing the solvent by drying, the solvent discharged to the outside can be efficiently recovered simply by providing a solvent trap in the exhaust path;
There are advantages such as.

In the centrifugal coating method, the cylindrical coating film applied to the cylindrical mold must be attached to the cylindrical mold when the solvent is dried and cured, and the cylindrical coating is cured when the mold is removed. Although it is necessary that the film can be easily released from the cylindrical mold, there has not yet been obtained a cylindrical mold that satisfies such contradictory needs at the same time.
JP 2002-79535 A

  Conventionally, various releasable materials have been studied as a release layer constituting a cylindrical mold, but a cylindrical mold in which a release layer is formed of a material such as glass or fluororesin until the cylindrical coating film is touch-dried. Is firmly attached to the inner wall of the cylindrical mold, but if the release layer is highly peelable, it begins to peel off from the end of the cylindrical cured film at the stage of heating and curing the cylindrical coating film, which is severe. In some cases, the entire cylindrical cured film floats, and further, the floated portion of the cylindrical cured film contracts non-uniformly, and a cylindrical cured film (endless belt) having a desired diameter cannot be obtained. .

  FIG. 4 is a longitudinal sectional view illustrating a conventional method for curing a finger-dried cylindrical coating film. FIG. 4A is a diagram illustrating a method for inserting and loading a cylindrical curing mold into a finger-dried cylindrical coating film. The state which is going to form a cylindrical hardened film by carrying out heat hardening is shown, and (b) shows the state which is going to remove the cylindrical hardened film from a cylindrical hardening mold. As shown in FIG. 4, in order to avoid the above-described problem, a cylindrical cylindrical mold 111 is inserted and loaded inside the finger-dried cylindrical coating film 104, and the cylindrical coating film 111 is heated in that state. A method of curing to form a cylindrical cured film 105 has been employed. However, in such a method, when air enters between the cylindrical cured mold 111 and the cylindrical cured film 105, the air cannot escape and the cylinder is cured. There is a problem that the cured film 105 is deformed into a convex shape. Further, if the clearance is increased in order to prevent air from entering between the cylindrical cured mold 111 and the cylindrical cured film 105, There was a problem that the shrinkage became uneven and wrinkles occurred.

  In addition, a cylindrical coating film made of a curing reactive resin such as a cylindrical coating film made of polyamic acid contracts during the curing [see the arrow in FIG. 4 (a). Therefore, it tightly wraps around a cylindrical curing mold inserted and loaded in a cylindrical coating film made of a curing reactive resin [see the arrow in FIG. 4 (b). For this purpose, the mold is removed manually (see the upward arrow in FIG. 4B). There was a problem that it became difficult. Moreover, even if an attempt is made to remove a cylindrical hardened film tightly wound around such a cylindrical hardened mold using an air gun, the air gun inlet cannot be set. There was a problem.

  The present invention aims to solve this problem.

That is, the present invention, it is possible to satisfactorily demolded polyimide cylindrical cured film, floating, convex deformation, it is possible to obtain a uniform polyimide cylindrical cured films wrinkles, demolded polyamic acid cylindrical curing mold to form the polyimide cylindrical cured film from the cylindrical coated film, and aims to provide a method for producing a polyimide cylindrical cured film using the same at low cost.

In order to solve the above problem, the present inventors have made aluminum, aluminum alloy, or hard glass formed into a cylindrical shape in a polyamic acid cylindrical coating film (polyamic acid cylindrical film) demolded from a cylindrical mold. A first support composed of a rigid body made of the second material and a second heat composed of a heat-resistant flexible belt made of nickel or stainless steel formed in a cylindrical shape provided on the outer surface of the first support. A cylindrical curing mold (polyimide cylindrical film) is formed by inserting and loading a cylindrical curing mold having a plurality of supports in sequence and subjecting the polyamic acid cylindrical coating film to heat curing treatment. Then, the second support body on which the polyimide cylindrical film is formed and the first support body are separated, and then the second support body on which the polyimide cylindrical film is formed is bent. was Mase, And we have completed the present invention found that readily release to float the polyimide cylindrical film.

That is, the invention described in claim 1, in order to achieve the above object, aluminum formed into a cylindrical shape, a first support member constituted by a rigid body made of an aluminum alloy or a hard glass, said support was demolded, characterized in that it successively comprises a second support configured, the heat-resistant flexible belt made of cylindrically formed nickel or stainless steel provided in the outer surface This is a cylindrical curing mold for forming a polyimide cylindrical cured film from a polyamic acid cylindrical coating film .

The invention described in claim 2 is characterized in that, in the invention described in claim 1 , the surface roughness Ra of the flexible belt is 0.2 μm or less.

The invention described in claim 3 is the invention described in claim 1 or 2 , characterized in that the outer surface of the second support is covered with a release layer.

The invention described in claim 4 is the invention described in claim 3 , wherein the release layer is made of a fluororesin.

The invention described in claim 5 is the invention described in claim 3 , wherein the release layer is made of molybdenum disulfide.

The invention described in claim 6
(B) a polyamic acid solution was coated on the inner peripheral surface of the cylindrical mold Yubisawa dried to form a polyamic acid cylindrical coating film,
(B) a step of demolding the polyamic acid cylindrical coating film from the cylindrical mold,
(C) a step of inserting loading the cylindrical curing mold according to any one of claims 1 to 5 in from the cylindrical mold demolded polyamic acid cylindrical coating film,
(D) forming a polyimide cylindrical cured film is subjected to heat curing treatment polyamic acid cylindrical coating film inserted loaded the cylindrical curing mold,
(E) separating the second support formed of the polyimide cylindrical cured film, the a first support, a and,
(F) the flexed polyimide cylindrical cured film said second support formed of step of releasing the polyimide cylindrical cured film,
A method for producing a polyimide cylindrical cured film, which sequentially with a.

According to the invention described in claim 1, aluminum is formed in a cylindrical shape, a first support member constituted by a rigid body made of an aluminum alloy or a hard glass, cylindrical shape provided on the outer surface of the support since sequentially has a second support configured, a flexible belt made of formed nickel or stainless steel, it is possible to satisfactorily demolded polyimide cylindrical cured film, floating , providing convex deformation, it is possible to obtain a uniform polyimide cylindrical cured films wrinkles, a cylindrical curing mold to form the polyimide cylindrical cured film from demolded polyamic acid cylindrical coating film at a low cost can do. According to the first aspect of the present invention, the first support body made of a rigid body made of aluminum, aluminum alloy or hard glass formed in a cylindrical shape is flexible in the shape of a cylinder. Since it is provided on the inner side of the second support formed of a belt, it can have pressure resistance against the contraction pressure by the second support. Can be prevented. According to the first aspect of the present invention, the second support body composed of a heat-resistant flexible belt made of nickel or stainless steel formed in a cylindrical shape utilizes the deflection. Thus, the second support can be reused, and the flexible belt is made of a heat-resistant material made of nickel or stainless steel. Even if the cylindrical coating film formed in step 3 is subjected to a heat treatment at about 300 ° C. and cured, the flexible belt does not change in quality.

According to the invention described in claim 2 , since the surface roughness Ra of the flexible belt is 0.2 μm or less, the surface of the flexible belt becomes a mirror surface, and the polyamide transferred along with the mirror surface surface roughness of the rear surface of the acid cylindrical coating film becomes small, for this reason, even no longer occur uneven deformation to the surface during curing of the polyamic acid cylindrical coating film, therefore, the polyimide cylindrical cured film having good surface obtained It is done.

According to the invention described in claim 3 , since the outer surface of the second support is covered with the release layer, the releasability is improved, so that the release is facilitated.

According to the invention described in claim 4 , since the release layer is made of a fluororesin, the release property is good and the cylindrical coating film disposed on the surface of the release layer is provided. Even if a heat treatment at about 300 ° C. is applied and cured, the release layer does not change in quality.

According to the invention described in claim 5 , since the release layer is made of molybdenum disulfide, the friction coefficient of the surface of the release layer is greatly reduced, and therefore, the release is easier. Become.

According to the invention described in claim 6 ,
(B) a polyamic acid solution was coated on the inner peripheral surface of the cylindrical mold Yubisawa dried to form a polyamic acid cylindrical coating film,
(B) a step of demolding the polyamic acid cylindrical coating film from the cylindrical mold,
(C) a step of inserting loading the cylindrical curing mold according to any one of claims 1 to 5 in from the cylindrical mold demolded polyamic acid cylindrical coating film,
(D) forming a polyimide cylindrical cured film is subjected to heat curing treatment polyamic acid cylindrical coating film inserted loaded the cylindrical curing mold,
(E) separating the second support formed of the polyimide cylindrical cured film, the a first support, a and,
(F) the flexed polyimide cylindrical cured film said second support formed of step of releasing the polyimide cylindrical cured film,
Since successively has, it is possible to satisfactorily demolded polyimide cylindrical cured film, floating, it is possible to obtain a convex deformation, no wrinkles uniform polyimide cylindrical cured film.

  Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view illustrating a method for forming a polyamic acid cylindrical coating film by a centrifugal coating molding method according to an embodiment of the present invention. FIG. 1 (a) is a diagram showing a polyamide on a release layer in a cylindrical molding die. The state in which the acid solution is applied is shown, and (b) shows the state in which the applied polyamic acid solution is touch-dried and released to form a polyamic acid cylindrical coating film. FIG. 2 is a longitudinal cross-sectional explanatory view showing a method for curing a polyamic acid cylindrical coating film according to an embodiment of the present invention, and (a) is a cylindrical curing molding in the polyamic acid cylindrical coating film. A state in which a polyimide cylindrical cured film is formed by inserting and charging a mold and heat-curing is shown. (B) shows a second support and a cylinder in a cylindrical curing mold having a polyimide cylindrical cured film formed thereon. (C) shows a state in which the polyimide cylindrical cured film formed on the outer surface of the second support is completely separated, d) shows a state that the release of the polyimide cylindrical cured film from the second support, and, (e) shows a state in which the polyimide cylindrical cured film was released from the second support.

As shown in FIGS. 1 and 2 , the cylindrical curing mold 13 for forming the polyimide cylindrical cured film 5 from the demolded polyamic acid cylindrical coating film 4 of the present invention is made of aluminum formed in a cylindrical shape. a first support 11 consists of a rigid made of an aluminum alloy or a hard glass, flexible belt heat resistance made of cylindrically formed nickel or stainless steel provided on the outer surface of the support 11 The 2nd support body 12 comprised by these.

Thus, aluminum formed into a cylindrical shape, a first support 11 consists of a rigid made of an aluminum alloy or a hard glass, the nickel is formed into a cylindrical shape provided on the outer surface of the support 11 or a second support 12 consists of a flexible belt heat resistance made of stainless steel and a has, it is possible to satisfactorily demolded polyimide cylindrical cured film 5, floating, convex Jo deformation, it is possible to obtain a uniform polyimide cylindrical cured film 5 without wrinkles [see Figure 2 (d) and (e). The cylindrical curing mold 13 for forming the polyimide cylindrical cured film 5 from the demolded polyamic acid cylindrical coating film 4 can be provided at a low cost. In addition, the first support 11 made of a rigid body made of aluminum, aluminum alloy or hard glass formed in a cylindrical shape is a second support 12 made of a flexible belt formed in a cylindrical shape. If it is provided on the inner side, it is possible to provide pressure resistance against the contraction pressure by the second support 12, and therefore, deformation of the second support 12 can be prevented. Further, when the second support 12 composed of a heat-resistant flexible belt made of nickel or stainless steel formed in the cylindrical shape utilizes the bending, the second support 12 can be reused, and when the flexible belt is made of a heat-resistant material made of nickel or stainless steel, the cylindrical coating film formed on the surface of the flexible belt is 300. Even if the heat treatment is performed at about 0 ° C., the flexible belt does not deteriorate. Furthermore, when the heat resistant material is nickel or stainless steel, the flexible belt can be easily manufactured.

The surface roughness of the flexible belt is preferably 0.2 μm or less in terms of Ra. Thus, when the surface roughness Ra of the flexible belt is 0.2 μm or less, the surface of the flexible belt becomes a mirror surface, and the back surface of the polyamic acid cylindrical coating film 4 transferred accordingly. surface roughness becomes small, for this reason, even no longer occur uneven deformation to the surface during curing of the polyamic acid cylindrical coating film 4, thus, the polyimide cylindrical cured film 5 of good surface obtained.

  In the present invention, the outer surface of the second support 12 is preferably covered with a release layer (not shown). Thus, since the outer surface of the second support 12 is covered with the release layer, the releasability is improved, so that the release is facilitated.

  The release layer is preferably made of a fluororesin. Thus, when the mold release layer is made of a fluororesin, the mold release property is good, and the cylindrical coating film 4 disposed on the surface of the mold release layer is subjected to a heat treatment at about 300 ° C. Even if it is applied and cured, the release layer is not altered.

  The release layer is preferably made of molybdenum disulfide. As described above, when the release layer is made of molybdenum disulfide, the friction coefficient of the surface of the release layer is greatly reduced, so that the release is further facilitated.

The cylindrical cured film 5 of the present invention is
(B) a step of a polyamic acid solution on the inner circumferential surface of the cylindrical mold 3 Yubisawa dried coating to form a polyamic acid cylindrical coating film 4 [Fig 1 (a)],
(B) a step of demolding the polyamic acid cylindrical coating film 4 from the cylindrical mold 3 [FIG. 1 (b)],
(C) a step of inserting loading the cylindrical curing mold 13 according to any one of claims 1 to 5 in said cylindrical mold 3 from demolded polyamic acid cylindrical coating film 4,
(D) forming a polyimide cylindrical cured film 5 is subjected to heat curing treatment in the polyamic acid cylindrical coating film 4 a cylindrical curing mold 13 was inserted loaded [FIG 2 (a)],
(E) and the second support 12 formed of the polyimide cylindrical cured film 5, and the first support 11, separating the FIG 2 (c)], and,
(F) the step of deflecting the polyimide cylindrical cured film the second support 12 which is formed of 5 to release the polyimide cylindrical cured film 5 [FIG. 2 (d)],
Are manufactured sequentially.

Thus, when the polyimide cylindrical cured film 5 is manufactured sequentially through said (a) step - (f) step, it is possible to satisfactorily demolding the polyimide cylindrical cured film 5, floating, convex deformation, it is possible to obtain a no wrinkles uniformly the polyimide cylindrical cured film 5.

Wherein (b) In the step, the polyamic acid cylindrical coating film 4 is demolded in the direction of the arrow in FIG. 2 (a), in the above (e) step, is formed of the polyimide cylindrical cured film 5 The second support 12 is separated in the direction of the arrow in FIG. 2B, and in the step (f), the second support 12 is bent in the direction of the arrow in FIG. I can. Then, the (f) polyimide cylindrical cured film 5 which is releasing the process, as shown in FIG. 2 (e), it is released from the second support 12.

An intermediate transfer unit of the present invention includes a polyimide cylindrical cured film 5 obtained by the manufacturing method of the polyimide cylindrical cured film 5 according to claim 6 as an intermediate transfer belt. Thus, when the intermediate transfer unit has an intermediate transfer belt of polyimide cylindrical cured film 5 obtained by the method of manufacturing polyimide cylindrical cured film 5 according to claim 6, the left and right circumferential length deviation The belt drive becomes good as it decreases.

The image forming apparatus of the present invention includes a polyimide cylindrical cured film 5 obtained by the method of manufacturing polyimide cylindrical cured film 5 according to claim 6 as an intermediate transfer belt. Thus, the circumferential length deviation of the left and right of the image forming apparatus has a polyimide cylindrical cured film 5 obtained by the process for the preparation of the polyimide cylindrical cured film 5 according to claim 6 as an intermediate transfer belt is reduced At the same time, the belt drive becomes good, and a good quality image is obtained for them.

Example 1
After the hard chrome treatment was applied to the entire inner surface of the cylinder made of aluminum, a fluororesin coating treatment was performed to produce a cylindrical mold. Conductive carbon black is dispersed in a polyamic acid solution of polyimide precursor (Torays # 3000, manufactured by Toray Industries, Inc.), and this dispersion is diluted to 30% with N, N-dimethylacetamide (DMAC) to obtain a coating solution. . The coating solution is applied to the inside of the cylindrical mold while rotating the cylindrical mold at a low speed to form a polyamic acid cylindrical coating film (polyamic acid cylinder) , and then the cylindrical mold is set at a high speed (800 rpm). The polyamic acid coating film was rotated to a uniform thickness, and then the polyamic acid cylindrical coating film was dried at 80 ° C. to remove the solvent to form a polyamic acid cylindrical film. Then, the rotation of the cylindrical mold is stopped, the cylindrical mold is taken out, the weir is removed, and then the cylindrical mold is made of a rigid body made of aluminum formed in a cylindrical shape. A first support and a 30 μm-thick flexible belt having a surface roughness Ra of 0.2 μm made of nickel provided on the outer surface of the first support. And a cylindrical curing mold having the support, and transferring them to a thermostatic bath, first, the solvent contained in the polyamic acid cylindrical film is completely removed by heating at a temperature of 100 ° C., Next, the polyamide acid cylindrical film was completely cured by heating at a temperature of 300 ° C. to form a polyimide cylindrical cured film (polyimide cylindrical film) . The polyimide cylindrical film thus formed had no film floating. Next, the second support body on which the polyimide cylindrical film is formed and the first support body are separated, and then the second support body on which the polyimide cylindrical film is formed is bent to form the polyimide cylindrical film. Then, the polyimide cylindrical membrane was separated from the second support to obtain a polyimide cylindrical membrane. At this time, the second support on which the polyimide cylindrical film was formed was easily separated from the first support. Further, by bending the second support, a gap is formed between the second support and the polyimide cylindrical film, and once the gap is formed over the entire circumference, the polyimide cylindrical film becomes the second support. Was easily demolded.

(Example 2)
A polyimide cylindrical membrane was obtained in the same manner as in Example 1 except that a fluororesin coating composed of 10 μm thick polytetrafluoroethylene (PTFE) was provided on the outer surface of the flexible belt. At this time, the second support on which the polyimide cylindrical film was formed was easily separated from the first support. Further, by bending the second support, a gap is formed between the second support and the polyimide cylindrical film, and once the gap is formed over the entire circumference, the polyimide cylindrical film becomes the second support. Was more easily demolded.

(Example 3)
A polyimide cylindrical film was obtained in the same manner as in Example 1 except that a molybdenum disulfide film composed of molybdenum disulfide formed by spraying fine particles of molybdenum disulfide on the outer surface of the flexible belt was provided. At this time, the second support on which the polyimide cylindrical film was formed was easily separated from the first support. Further, by bending the second support, a gap is formed between the second support and the polyimide cylindrical film, and once the gap is formed over the entire circumference, the polyimide cylindrical film becomes the second support. Was more easily demolded.

Example 4
A polyimide cylindrical membrane was obtained in the same manner as in Example 1 except that a flexible belt made of stainless steel (SUS) was used as the flexible belt constituting the second support. At this time, the second support on which the polyimide cylindrical film was formed was easily separated from the first support. Further, by bending the second support, a gap is formed between the second support and the polyimide cylindrical film, and once the gap is formed over the entire circumference, the polyimide cylindrical film becomes the second support. Was easily demolded.

(Comparative Example 1)
A polyimide cylindrical film was obtained in the same manner as in Example 1 except that it was made of aluminum and the cylinder was a cylindrical hardening mold. At this time, when the surface of the cylindrical curing mold was mirror-finished, it stuck tightly and could not be manually peeled off, and the polyimide cylinder was torn when it was forcibly removed. Moreover, when Ra was roughened to about 10 μm by sandblasting the surface of the cylindrical hardening mold, it was able to be peeled off manually, but wrinkles were generated if too much force was applied in a rather difficult operation, and it was awful. Sometimes a crease could not be restored. Furthermore, when the surface of the cylindrical curing mold was roughened to 20 μm or more, peeling was easy, but minute irregularities were generated on the outer surface, resulting in a decrease in surface gloss.

(Comparative Example 2)
Surface roughness of the flexible belt constituting the second support: A polyimide cylindrical film was obtained in the same manner as in Example 1 except that Ra was 5 μm. At this time, the polyimide cylindrical film was easy to peel off, but the smoothness of the surface was small, and the gloss was duller than in Example 1.

(Comparative Example 3)
Surface roughness of the flexible belt constituting the second support: A polyimide cylindrical membrane was obtained in the same manner as in Example 1 except that Ra was 10 μm. At this time, the polyimide cylindrical film was easy to peel off, but the smoothness of the surface was small, and the gloss was duller than in Example 1.

  As described above, the ends of the polyimide cylindrical membranes obtained in Examples 1 to 4 and Comparative Examples 1 to 3 are cut off, and mounted on a full-color copying machine (manufactured by Ricoh Co., Ltd.) as an endless belt of a predetermined size to evaluate an image. As a result, the endless belt made of the polyimide cylindrical film obtained in Examples 1 to 4 had good image density and no blur, but the polyimide cylinder obtained in Comparative Examples 1 to 3 When the film was an endless belt, the image density contrast was not sufficient.

BRIEF DESCRIPTION OF THE DRAWINGS It is longitudinal cross-sectional explanatory drawing which shows the formation method of the polyamic-acid cylindrical coating film by the centrifugal coating method which shows one Embodiment of this invention, Comprising : (a) apply | coats a polyamic acid solution on the peeling layer in a cylindrical shaping | molding die (B) shows a state in which the coated polyamic acid solution is touch-dried and released to form a polyamic acid cylindrical coating film. BRIEF DESCRIPTION OF THE DRAWINGS It is longitudinal cross-sectional explanatory drawing which shows the hardening method of the polyamic-acid cylindrical coating film which shows one embodiment of this invention, Comprising : (a) inserts and loads a cylindrical hardening mold in a polyamic-acid cylindrical coating film Shows a state in which a polyimide cylindrical cured film is formed by heating and curing, and (b) shows a second support and a cylindrical curing mold in the cylindrical curing mold on which the polyimide cylindrical cured film is formed. (C) shows a state where the polyimide cylindrical cured film formed on the outer surface of the second support is completely separated, (d) The state in which the polyimide cylindrical cured film is released from the second support is shown, and (e) shows the state in which the polyimide cylindrical cured film is removed from the second support. It is longitudinal cross-sectional explanatory drawing which shows the formation method of the cylindrical coating film by the conventional centrifugal coating molding method, (a) shows the state which forms a cylindrical coating film on the peeling layer, and (b) A state in which the cylindrical coating film is dried by touch and released. It is longitudinal cross-sectional explanatory drawing which shows the hardening method of the conventional cylindrical coating film dried by touch, Comprising: (a) inserts and loads a cylindrical hardening shaping | molding die in the cylindrical coating film dried by touch, and it heat-cures it. The state which is going to form a cylindrical hardened film by this is shown, (b) shows the state which is going to demold a cylindrical hardened film from a cylindrical hardening mold.

DESCRIPTION OF SYMBOLS 1 Cylindrical body 2 Release layer 3 Cylindrical shaping | molding die 4 Polyamic-acid cylindrical coating film (polyamic-acid cylindrical film)
5Polyimide cylindrical cured film (Polyimide cylindrical film)
DESCRIPTION OF SYMBOLS 11 1st support body 12 2nd support body 13 Cylindrical hardening mold

Claims (6)

Cylindrically formed aluminum, and consists of rigid body made of an aluminum alloy or a hard glass first support, the nickel being formed into a cylindrical shape provided on the outer surface of the support also
A second support composed of a flexible belt heat resistance made of stainless steel, sequentially has been polyimide cylindrical cured film from the polyamic acid cylindrical coating film was removed from the mold, characterized in that it has a cylindrical curing mold that forms. The surface roughness of the flexible belt: Ra is 0.2 μm or less. Cylindrical curing for forming a polyimide cylindrical cured film from the demolded polyamic acid cylindrical coating film according to claim 1. Mold. It said cylindrical outer surface of the second support, to form a polyimide cylindrical cured film from demolded polyamic acid cylindrical coating film according to claim 1 or 2, characterized in that it is coated with a release layer Mold curing mold. The said mold release layer is comprised with the fluororesin, The cylindrical hardening mold which forms a polyimide cylindrical cured film from the demolded polyamic-acid cylindrical coating film of Claim 3 characterized by the above-mentioned. 4. The cylindrical curing mold for forming a polyimide cylindrical cured film from a demolded polyamic acid cylindrical coating film according to claim 3 , wherein the release layer is made of molybdenum disulfide. (B) a polyamic acid solution was coated on the inner peripheral surface of the cylindrical mold Yubisawa dried to form a polyamic acid cylindrical coating film,
(B) a step of demolding the polyamic acid cylindrical coating film from the cylindrical mold,
(C) a step of inserting loading the cylindrical curing mold according to any one of claims 1 to 5 in from the cylindrical mold demolded polyamic acid cylindrical coating film,
(D) forming a polyimide cylindrical cured film is subjected to heat curing treatment polyamic acid cylindrical coating film inserted loaded the cylindrical curing mold,
(E) separating the second support formed of the polyimide cylindrical cured film, the a first support, a and,
(F) the flexed polyimide cylindrical cured film said second support formed of step of releasing the polyimide cylindrical cured film,
Producing a polyimide cylindrical cured film, which sequentially with a.

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