JP4724130B2 - Tube roller manufacturing method - Google Patents

Description

  The present invention relates to a method of manufacturing a tube roller used in a heat fixing section of an electronic copying machine or a laser beam printer.

The fluororesin tube roller is a fixing roller formed by coating a fluororesin tube on an elastic rubber layer, or a pressure roller. Generally, it is manufactured as follows.
First, a liquid primer is applied to the inner surface of the fluororesin tube in a state where the fluororesin tube having a predetermined dimension is attached to the inner surface of the cylindrical mold. Next, the core shaft is inserted and assembled into the axial center of the cylindrical mold, and liquid rubber such as silicone rubber is injected between the core shaft and the fluororesin tube. Thereafter, a tube roller is obtained by applying a predetermined heat to cure the liquid rubber to such an extent that the desired elasticity is not impaired.
In general, when a primer is applied to the inner surface of a fluororesin tube, a spraying method is employed (see Patent Document 1).
JP 2004-347729 A

The conventional technology has the following problems to be solved.
When the primer is applied, spray application is performed from the open end of the fluororesin tube toward the inner surface. However, this spray coating method has a problem that the amount discharged from the open end of the tube is much larger than the amount attached to the inner surface of the fluororesin tube, and it takes time to uniformly attach the tube. . For example, the amount of primer adhering to the inner surface of the fluororesin tube is about 1.0 g per one, whereas about 7.0 g is used. The primer is generally an expensive material, and the loss of 6 g that is merely discharged is in a range that cannot be overlooked as the cost increase.

  The present invention has been made paying attention to the above points, and an object of the present invention is to provide a method of manufacturing a tube roller capable of efficiently and uniformly adhering a primer to the inner surface of a fluororesin tube.

In each embodiment of the present invention, the above-described problems are solved by the following configurations.
<Configuration 1>
A method of manufacturing a tube roller used in a heat fixing part of an electronic copying machine, a laser beam printer, etc., comprising a step of mounting a fluororesin tube on the inner surface of a cylindrical body, and injecting a liquid primer into the fluororesin tube And covering both ends of the fluororesin tube with a lid, and sealing the cylindrical body with the primer sealed in the fluororesin tube, with the axis of the cylindrical body as the pivot axis. The center of the cylindrical body is inclined with respect to the center of the cylinder, and the axis of the cylinder is rotated at a rotation speed of 30 to 60 rpm with the rotation axis as the rotation axis, and the axis of the cylinder is set as the rotation axis. A step of swinging by rotating the cylindrical body, a step of removing the lid and leaving the cylindrical body upright, and a step of drying the inside of the fluororesin tube. Heating the cylindrical body to fix the primer to the inner surface of the fluororesin tube; inserting a core shaft into the cylindrical body; and injecting and curing rubber between the cylindrical body and the core shaft. And a step of performing secondary vulcanization thereafter, and a method for manufacturing a tube roller.

By enclosing the liquid primer directly on the inner surface of the fluororesin tube and swinging the tube through the cylindrical body, the primer is efficiently applied in the fluororesin tube, so the amount of primer loss can be greatly reduced. . Moreover, while turning both ends of the cylindrical body at a rotational speed of 30 to 60 rpm around the central portion of the cylindrical body, and rotating the cylindrical body, the cylindrical body is alternately inclined with the central portion as a fulcrum. Therefore, a liquid primer spreads in the length direction in a fluororesin tube, and is uniformly applied in a fluororesin tube.

<Configuration 2 >
In the method for manufacturing a tube roller according to Configuration 1, both ends of the fluororesin tube are folded outward along the end of the cylindrical body, and the lid is formed outside the folded end of the fluororesin tube. A method of manufacturing a tube roller, wherein

  Since the end of the fluororesin tube is interposed, good liquid tightness between the cylindrical body and the lid can be easily obtained.

<Configuration 3 >
In the manufacturing method of the tube roller of the structure 1, The said primer has a viscosity of 10-500 cp, The manufacturing method of the tube roller characterized by the above-mentioned.

  The primer can be uniformly applied to the entire surface of the fluororesin tube by preventing the occurrence of a non-wetting portion by the primer and preventing the primer coating layer from becoming uneven.

<Configuration 4 >
The method for manufacturing a tube roller according to Configuration 1, wherein in the step of drying the inside of the fluororesin tube, the primer is dried while rotating the cylindrical body.

  If it is dried for about 30 seconds while rotating the primer, the solvent of the primer is gradually removed, and the occurrence of traces of dripping of the primer can be suppressed.

<Configuration 5 >
In the method for manufacturing a tube roller according to Configuration 1, in the step of heating the cylindrical body and fixing the primer to the inner surface of the fluororesin tube, the cylindrical body is heated at 120 to 250 ° C. for 1 to 20 minutes. A method of manufacturing a tube roller characterized by the above.

  The primer can be satisfactorily fixed to the inner surface of the fluororesin tube.

In the present invention, the fluororesin tube is attached to the inner surface of the cylindrical body, and after injecting the liquid primer into the fluororesin tube, the cylindrical body is sealed in a state where both ends of the fluororesin tube are covered with a lid. The amount of primer loss can be greatly reduced. The primer coating layer obtained in this way is not inferior to the layer applied by spraying in terms of appearance and adhesiveness.
Hereinafter, embodiments of the present invention will be described based on examples.

1-6 is explanatory drawing of each process of the manufacturing method of the tube roller of Example 1. FIG.
First, as shown in FIG. 1, the fluororesin tube 12 was adhered to the inner surface of the cylindrical body 14 in a state of being expanded in the radial direction and / or the length direction. Then, the fluororesin tube 12 was inserted into the cylindrical body 14, and both ends thereof were folded outward along the end of the cylindrical body 14 and attached to the inner surface of the cylindrical body 14.

  Next, as shown in FIG. 2, one end of the cylindrical body 14 is covered with a lower lid 16 and sealed, and 3 g of a primer 18 for a fluororesin tube is placed in the cylindrical body 14 with the sealed end side facing down. Enclosed. Thereafter, the upper body 20 was put on the upper end of the cylindrical body 14 to seal the cylindrical body 14.

  The upper lid body 20 and the lower lid body 16 were placed outside the folded end portion 12A of the fluororesin tube 12. Since the folded end portion 12 </ b> A of the fluororesin tube 12 is interposed between each lid body and the cylinder body 14, the liquid tightness between the cylinder body 14 and each lid body 20, 16 is good. The shapes and materials of the upper lid 20 and the lower lid 16 are arbitrary as long as the primer 18 does not leak from the cylindrical body 14 in the next step. A rubber plug that exactly matches the inner diameter of the cylindrical body 14 may be used, or a jig that is placed so that the rubber packing may be brought into contact with the cylindrical body 14 may be used.

Subsequently, the cylindrical body 14 was swung so that the lids were disposed at both ends of the cylindrical body 14 so that the primer 18 did not leak. This swing may be freely swung, but as shown in FIG. 3, it is preferable to turn both ends of the cylindrical body 14 around the central portion 22 of the cylindrical body 14. Turning both end portions of the cylindrical body 14 about the central portion 22 of the cylindrical body 14 means that the axis 23 of the cylindrical body 14 is turned to a turning axis that is an axis that rotates about the central portion 22 of the cylindrical body 14. In other words, it is tilted with respect to the central portion 22 of the cylindrical body 14 and pivots about the axis 23 of the cylindrical body 14 about the pivot axis as a rotation axis .

  By turning in this way, the cylindrical body 14 is repeatedly tilted alternately with the central portion 22 as a fulcrum. For this reason, the liquid primer 18 spreads in the length direction in the fluororesin tube 12 and is uniformly applied to the inner surface of the fluororesin tube 12. As shown in FIG. 4, a primer coating layer 26 is formed on the inner surface of the fluororesin tube 12.

Note that the turning of the both ends of the cylindrical body 14 may be slow, and the rotation speed is suitably 30 to 60 rpm. Moreover, the angle α at which the cylindrical body 14 alternately inclines with the central portion 22 as a fulcrum may be adjusted as appropriate by increasing the diameter of the swivel at both ends of the cylindrical body 14. Further, when the both ends of the cylindrical body 14 are turned around the central portion, the cylindrical body 14 may be rotated, that is, rotated about the axis 23 as a rotation axis .

  Thereafter, as shown in FIG. 5, the lid bodies 16 and 20 were removed, and the cylindrical body 14 was left standing for about 10 seconds on a table 30 having an opening 28, and the excess primer 18 was discharged. Then, the cylindrical body 14 was rotated for about 30 seconds and the primer 18 was dried. By leaving it to stand for about 30 seconds, the solvent was gradually removed, and generation of traces of dripping of the primer 18 could be suppressed. Thereafter, the cylindrical body 14 was heated at 200 ° C. for 6 minutes, and the primer 18 was fixed to the inner surface of the fluororesin tube 12. The cylindrical body 14 may be heated at 120 to 250 ° C. for 1 to 20 minutes.

  After that, as shown in FIG. 6, the core shaft 24 is inserted into the cylindrical body 14 and the upper and lower ends of the cylindrical body 14 are covered with caps 32 and 34 and held concentrically as in a normal tube roller manufacturing process. . Thereafter, liquid silicone rubber 36 was injected and injected into the gap between the fluororesin tube 12 and the core shaft 24 from the injection hole 38 provided in the cap 32. Thereafter, predetermined heat treatment was performed to cure the silicone rubber 28 to obtain a finished tube roller.

  In the said Example, the fluororesin tube 12 used the PFA tube of thickness 30 micrometers. The inner surface of this PFA tube was previously subjected to a known chemical etching treatment. As a primer for fluororesin tubes, 100 parts by weight of DY39-067 made by Toray Dow Corning Silicone Co., Ltd. and 80 parts by weight of SG93K A / B made by Shin-Etsu Chemical Co., Ltd. were mixed and stirred sufficiently. It was used.

  An important factor in primer preparation is the viscosity of the solution. If the viscosity is too high, a portion that is not wet tends to occur, and if the viscosity is low, the color of the applied primer tends to be uneven. As an appropriate viscosity, it is desirable to prepare 10 to 500 cp (centipoise), preferably 30 to 150 cp. A cylindrical body 14 having an inner diameter of 22 mm was used as a primer coating mold.

  The core shaft 24 has a length corresponding to a paper having an outer diameter of 16 mm and A4 size, and the material is A5056. As a core shaft primer, a mixture of 1: 1 primer No101 A / B manufactured by Shin-Etsu Chemical Co., Ltd. was applied, and heat treatment was performed at 150 ° C. for 20 minutes. The rubber used was X34-2061-28L A / B manufactured by Shin-Etsu Chemical Co., Ltd. and 10 parts by weight of triethylene glycol.

  In the above example, the amount of the primer used up to 7 g is 3 g, and the cost can be reduced by 4 g. Since 1 g of the primer is a material of about 6 yen, it is considerably reflected in the price of the entire roller.

It is explanatory drawing of the process of mounting | wearing the fluororesin tube of Example 1 to the inner surface of a cylindrical body. It is explanatory drawing of the process of inject | pouring a liquid primer in the fluororesin tube of Example 1, and sealing both the end surfaces of the said fluororesin tube. It is explanatory drawing of the process of rock | fluctuating a cylindrical body in the state which enclosed the primer in the fluororesin tube of Example 1. FIG. It is explanatory drawing of the process immediately after rocking | fluctuating the cylindrical body of Example 1. FIG. It is explanatory drawing of the process left to stand in the state which the cylindrical body of Example 1 stood. FIG. 6 is an explanatory diagram of a final stage process of the first embodiment.

Explanation of symbols

12 Fluororesin tube 14 Cylindrical body 16 Lower lid body 18 Primer 20 Upper lid body 22 Central portion
23 axis 26 primer coating layer

Claims (5)

A method of manufacturing a tube roller used in a heat fixing part of an electronic copying machine or a laser beam printer,
Attaching the fluororesin tube to the inner surface of the cylindrical body;
Injecting a liquid primer into the fluororesin tube, and sealing both ends of the fluororesin tube with a cover, and
With the primer sealed in the fluororesin tube, the cylindrical body is tilted with respect to the pivot axis with respect to the axis of the cylindrical body, and the axis of the cylindrical body is centered on the central portion of the cylindrical body. Swiveling around the turning axis as a rotation axis at a rotation speed of 30 to 60 rpm, and swinging by rotating the cylindrical body around the axis of the cylinder as a rotation axis ;
Removing the lid and leaving the cylinder upright; and
Drying the inside of the fluororesin tube;
Heating the cylindrical body to fix the primer to the inner surface of the fluororesin tube;
A tube roller having a step of inserting a core shaft into the cylindrical body, injecting and curing rubber between the cylindrical body and the core shaft, and thereafter performing secondary vulcanization. Method. In the manufacturing method of the tube roller of Claim 1,
Fold both ends of the fluororesin tube outward along the end of the cylindrical body,
A method of manufacturing a tube roller, wherein the lid is placed on an outer side of a folded end portion of the fluororesin tube. In the manufacturing method of the tube roller of Claim 1,
The method for producing a tube roller, wherein the primer has a viscosity of 10 to 500 cp. In the manufacturing method of the tube roller of Claim 1,
In the step of drying the inside of the fluororesin tube, the primer is dried while rotating the cylindrical body. In the manufacturing method of the tube roller of Claim 1,
In the step of heating the cylindrical body to fix the primer to the inner surface of the fluororesin tube, the cylindrical body is heated at 120 to 250 ° C. for 1 to 20 minutes.

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