JPH03130765A - Feed roll for photographic developing machine - Google Patents

Abstract

PURPOSE:To enhance the corrosion resistance of the feed roll by covering the surface of a metallic pipe with a heat shrinkable tube consisting of a polyphenylene oxide. CONSTITUTION:This feed roll consists of a roll 1 having the surface 2 in contact with a liquid chemical for photography and revolving shafts 3 provided at both ends of the roll 1. Both of the roll 1 and the revolving shafts 3 are formed by covering the surfaces of the metallic pipes with the heat shrinkable tubes consisting of the polyphenylene oxide and heat shrinking the tubes. The roll is so formed that the above-mentioned surface 2 exhibits the high smoothness of <=2mum average roughness.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a feed roll for a photographic developing machine.

In the present invention, the term "photographic developing machine" refers to an apparatus that performs at least one step of developing, stopping, fixing, etc. for black and white or color film, photographic paper, or the like.

[Conventional technology]

Currently, when developing a large amount of photographed film, a so-called automatic developing machine is used, which continuously develops, stops, fixes, washes, and dries the film. In addition, when obtaining photographic paper photographs from film, the exposure, development, and
A so-called laboratory that continuously performs stopping, fixing, washing, and drying.
For example, Color Lab is used. In both automatic processors and labs, multiple feed rolls are used to successively pass film, paper, etc. through a developer solution, a stop solution, and a fixer solution. Originally, these precepts (hereinafter, these liquids are referred to as photographic chemicals), especially the developing solution and the fixing solution, were
Since these materials have strong corrosion resistance, the feed rolls that come into contact with these photographic chemicals are highly corrosion resistant. For this reason, plastic feed rolls have recently been used in place of metal feed rolls. However, even with long-term use, the surface of these plastic feed rolls gradually corrodes and becomes rough, and eventually the film and damage the photographic paper.

[Object of the invention and its outline]

The present inventors have focused on the fact that polyphenylene oxide exhibits excellent corrosion resistance against various photographic chemicals, and have been conducting intensive research and development on a feed roll for photographic processing machines made of polyphenylene oxide. We came up with a new idea to develop a feed roll with polyphenylene oxide formed on the surface of a metal pipe. Further research revealed that in order to form polyphenylene oxide on the surface of a metal pipe with sufficient adhesive strength as a feed roll, it was found that the metal pipe was coated with a heat-shrinkable polyphenylene oxide tube. By doing so, we realized that an N layer with sufficient adhesive strength as a feed roll could be created without sacrificing the excellent corrosion resistance of polyphenylene oxide in the slightest, leading us to complete the present invention. . That is, the present invention relates to a feed roll for a photographic developing machine characterized in that the surface of a metal pipe is coated with a heat-shrinkable tube made of polyphenylene oxide.

〔Effect of the invention〕

Since the heat-shrinkable tube of polyphenylene oxide is formed on the surface of the metal pipe, it has excellent corrosion resistance, and it is particularly preferable that the surface of the coating layer covered with the heat-shrinkable tube of polyphenylene oxide has an average roughness of 2 μm. By having the following high smoothness, these products exhibit a high degree of corrosion resistance even when in contact with photographic chemicals for a long period of time, and because they are covered with heat-shrinkable tubes, they completely cover metal pipes. It has adhesive strength that allows it to withstand long-term use even when used as a feed roll.

In addition, since it is a heat-shrinkable tube, it can be coated with metal pipes extremely easily and in a short time.

[Structure of the invention]

Hereinafter, the present invention will be explained in detail with reference to the drawings. Figure 1 shows
1 is a perspective view of an embodiment of a feed roll for a photographic processing machine according to the present invention, which embodiment has a surface 2 in contact with a photographic chemical solution.
It consists of a roll 1 and a rotating shaft 3 provided at both ends of the roll, and both the roll 1 and the rotating shaft 3 are coated with a polyphenylene oxide coating layer made of a heat-shrinkable tube on the surface of a metal pipe 4. is in great shape. Further, in this example, the surface 2 has high smoothness with an average roughness of 2 μm or less over its entire length and circumference.

In the present invention, the average roughness is JIS B12O.
The value defined as the maximum height (Rs + ax ) defined in 3.3, which can be measured, for example, by a moving detector method or a moving stylus method.

In the present invention, a polyphenylene oxide heat-shrinkable tube can be manufactured by applying a conventional method for manufacturing a plastic heat-shrinkable tube. For example, as shown in FIG. 2, which is a schematic diagram of the manufacturing equipment, polyphenylene oxide is melted to form a core 1.
A tube is obtained by extrusion molding while maintaining the tube at a temperature of about 140 to 160 DEG C. while lubricating the inner surface with a mandrel 12 having a cylindrical shape.The tube is then expanded with an expansion die 13 and then cooled with a cooling device 14 to produce a tube.

Another example is a method using the apparatus shown in FIG. 3, which is also a schematic diagram of the manufacturing apparatus, in which molten polyphenylene oxide 21 is fed to an extruder having a core 22 to form a tube. In this method, the material is first cooled in a cooling device 23, then heated in a heating device 24, expanded in an expansion die 25, and cooled again in a cooling device 26. At this time, it is preferable to perform internal lubrication and external lubrication as shown by arrows A and B.

The method of coating the metal pipe with the heat-shrinkable tube is not limited in any way, and any method that can cover the metal pipe may be used, but a preferred specific method is to bury the shaft 34 at one end of the metal pipe 31 as shown in FIG. The metal pipe 31 may be covered with a heat-shrinkable tube 33, and heated to shrink the metal pipe 31.

The shaft portion 32 is manufactured by insert molding the shaft 34 in advance,
This shaft portion 32 is bonded to the metal pipe 31 by heat fusion or adhesive. As the heat fusion method, an ultrasonic welding method is preferable.

In addition to standard grades, the polyphenylene oxide used in the present invention includes various types such as those blended with other organic polymers such as polystyrene, or those grafted with such organic polymers or their monomers or oligomers. used. Commercially available products include Noryl 731J (product name) manufactured by Japan GE Plastics Co., Ltd. and Zylon 500H (product name) manufactured by Asahi Kasei Industries.
etc. can be exemplified.

Although polyphenylene oxide may be used alone, it may be used in combination with an antioxidant, a pigment, a reinforcing material, etc., if necessary. Examples of reinforcing materials include fibers such as phenol fibers, ceramic fibers, and carbon fibers; inorganic powders such as clay, molybdenum disulfide, graphite, and quartz glass powder;
Examples include whiskers such as potassium titanate, powders of metals such as brass, stainless steel, and copper.

The thickness of the polyphenylene oxide heat-shrinkable tube is usually 0.2 to 30 mm, preferably 0.3 to 1. Qm
It is about m.

As the metal pipe, vibrators made of various metals (including alloys) are used, and examples of the metal include iron, aluminum, etc.

Further, it is extremely preferable from the viewpoint of corrosion resistance that the surface of the polyphenylene oxide coating layer has an average roughness of 2 μm or less, but this method is not particularly limited, for example, it can be polished to an average roughness within the above range.

〔Example〕

EXAMPLES The present invention will be explained in more detail with reference to Examples below.

However, in the following examples, parts refer to parts by weight.

Example 1 A heat-shrinkable tube was prepared from polyphenylene oxide (Noryl 731J manufactured by Japan GE Plastics Co., Ltd., glass transition point: 220°C) using the apparatus shown in FIG. This heat-shrinkable tube was coated onto a hollow metal pipe having an outer diameter of 301 mm by the method shown in FIG. 4 to obtain a rod. On the other hand, a rotary shaft was obtained by covering a hollow metal pipe with an outer diameter of 101 mm with a heat-shrinkable tube using the same method. The average roughness of the rod was Rmax = 1.2. Then 07
A photographic feed roll was obtained by connecting the roll and the rotating shaft as shown in FIG.

Example 2 Regarding the photographic roll of Example 1, the rod was polished while rotating using its rotating shaft to give a smooth surface and a feed roll for a photographic developing machine of this example was obtained. The average roughness of the surface was approximately 1.0 μm as measured by the stylus movement method.

Example 3 A feed roll for a photographic developing machine having an average roughness of 1.8 μm was obtained in the same manner as in Example 2 above.

Next, Table 1 shows the corrosion resistance of each of the feed rolls for photographic processing machines obtained in Examples 1 to 3 to the respective photographic chemicals.
The average roughness after being immersed for several months is shown.

Table 1 Details of each photographic chemical solution used in Table 1 are as shown below.

Developer Solution-1 = High contrast developer containing g-acid-p-methylaminophenol as a developing agent.

Developer-2: A fine particle developer containing p-phenylenediamine as a developing agent.

Developer-3: A general developer containing hydroquinone and sulfuric acid-p-methylaminophenol as developing agents.

Fixer-1: An acidic fixer containing sodium thiosulfate as an overlying agent.

Fixer-2: Fixer for both papers.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of a feed roll for a photographic developing machine according to the present invention. Figures 2 and 3 are schematic cross-sectional views of manufacturing equipment used to manufacture heat-shrinkable tubes, and Figure 4 is a schematic cross-sectional view of the manufacturing equipment used to coat metal pipes with heat-shrinkable tubes. It is a schematic sectional view. 1 ・ ・ ・ ・ ・ Roll 2 ... Roll l surface 3 ... Rotating shaft 11 ... Center core 12 ... Mandrel 13 ... Expansion guide 21 ... ...Polyphenylene oxide 22...
・Central core 23... Cooling device 24... Heating VT station 25... Expansion guide 26... Cooling device 31... Metal pipe 32... Bra shaft 33. Heat-shrinkable tube (more than that) Fig. Fig. 2 Fig.

Claims (5)

[Claims] (1) A feed roll for a photographic developing machine, characterized in that the surface of a metal pipe is coated with a heat-shrinkable tube made of polyphenylene oxide. (2) The feed roll for a photographic developing machine according to item 1, wherein the feed roll surface portion that comes into contact with the photographic chemical has high smoothness with an average roughness of 2 μm or less. (3) The feed roll for a photographic developing machine according to claim 1, wherein the photographic chemical solution is a developer. (4) The feed roll for a photographic developing machine according to claim 1, wherein the photographic chemical solution is a stop solution. (5) The feed roll for a photographic developing machine according to claim 1, wherein the photographic chemical solution is a fixing solution.