JPH0745044Y2 - Plastic fiber molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a plastic fiber molding device for an optical fiber.

[Prior Art] A plastic fiber is formed of a core material and a clad material, an acrylic thermosetting resin is used as the core material, and a fluorine resin is used as the clad material. As described above, since the core material is thermally effective, the continuous extrusion-spinning method, which is conventionally used in the case of using the thermoplastic resin as the core material, has not been performed in the method for producing the plastic fiber.

In the case of plastic fiber, one method is to inject a liquid core material into a fluororesin tube that will be a clad material that has been extruded in advance, and then heat it to a temperature at which the core material reacts and cures and cure it. The core and the clad layer were integrated by.

To heat and cure the core material, put the take-up drum in a warm liquid such as silicon oil heated to a temperature at which the acrylic resin cures, about 80 ° C or higher, and take up the tube in which the core material is injected. It is made to cure and be molded while being wound on a drum.

FIG. 3 is a block diagram of an apparatus showing a conventional plastic fiber molding line, in which 1 is a tank for storing acrylic resin for core, 2 is a pressurizing device for pressurizing acrylic resin, and 3 is a tube connecting portion. 4 rotary joint,
5 is an acrylic resin introduction pipe, 6 is a delivery reel, 7
Is an extruded and molded fluororesin tube which is wound around the delivery reel 6 and whose end 7a is connected to the introduction pipe 5 through the rotary joint 3.

Reference numeral 8 is a guide roll, 9 is an oil layer, 10 is oil such as silicone oil, 11 is a winding bobbin for the tube 7 installed in the oil tank 9, and 12 is a drive motor for the winding bobbin 11.

In molding the plastic fiber, the acrylic resin for core is pressurized by the pressure device 2 and injected into the tube 7 via the rotary joint 3. Then, the tube 7 is unwound from the delivery reel 6 and cured and molded while being wound by the winding bobbin 11.

Fig. 4 is a cross-sectional view of the winding bobbin 11, showing the tube 7
When the layers are overlapped with three layers, a portion where the tubes 7 cross each other is generated.

When all the tubes 7 wound on the delivery reel 6 are fed out, the tubes 7 wound on the take-up bobbin 11 in the final stage are immersed in oil as they are until the acrylic resin is completely cured. After that, a separate rewinding machine was used to lift the oil tank 9.

In the above process, it is necessary to keep the core immersed for at least 80 ° C. and 150 ° C. for 1 hour or more before the core is uniformly cured. Now, when this is used as a linear oil tank, for example, an oil tank such as a cooling water tank of an extruder, it is possible to straighten the plastic fiber without using the take-up bobbin as described above. Since the fiber is hardened over a long period of time, the length of the oil tank becomes extremely long, or the hardening speed, that is, the take-up speed becomes extremely slow, which is not a very effective method.

[Problems to be Solved by the Invention] As compared with the prior art, it is difficult to wind the tube around the take-up bobbin in oil as described above.
When the three layers are stacked, crossing portions are formed and a small bend is generated in the wound portion, which adversely affects the optical transmission loss.

Further, at the final stage of feeding the tube, since it is cured in oil as described above and then rewound and pulled up from the oil tank, there is a drawback that the work becomes discontinuous and the efficiency becomes poor.

INDUSTRIAL APPLICABILITY The present invention can solve the drawbacks of the prior art and improve the work efficiency in the plastic fiber molding process, while eliminating the small bend of the tube wound around the winding bobbin and improving the transmission characteristics. An object of the present invention is to provide a plastic fiber molding device.

[Means for Solving the Problem] In the present invention, the tubes are wound in a line around the body of the take-up bobbin in the liquid temperature body, and the tube is pulled out from the withdrawing side while winding the tube from the winding side of the body. To this end, the winding bobbin is provided with a tapered body portion whose diameter on the pull-out side is smaller than that on the winding side.

[Operation] In the present invention, the body of the take-up bobbin installed in the warm liquid for heating and hardening the core material injected into the tube is provided with a taper, and the tube fed from the delivery reel is wound from the winding side to the body. It was wound around the part to form an aligned roll and pulled out simultaneously from the drawer side.

Therefore, the work can be continuously performed, and the wound tube can be prevented from crossing and bending.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a winding bobbin according to this embodiment.

In this embodiment, the winding bobbin 11 of the forming line shown in FIG. 2 is used, and the body of the winding bobbin 13 is tapered so that the diameter of the drawing side B is smaller than the diameter of the winding side A. Is forming.

Therefore, the tube 7 delivered from the delivery reel 6
When wound around the winding side A through the tube guide 14, they are sequentially sent to the right side of the drawing along the slope to form an aligned winding, which is drawn out from the drawing side B by the pull-up reel 15 and wound up.

The status of the prototype according to this embodiment is as follows.

In the acrylic plastic fiber molding work with a core diameter of 1.5 mm and a clad diameter of 2.2 mm, the winding bobbin 13 has a barrel diameter of πD = 1000 mm (φD = 318.3 mm) and a barrel taper of 1/1
A stainless steel drum having an inner width of 50 mm and a drum inner diameter of 50 mm was immersed in silicon oil at 100 ° C., and was pulled up while being wound at a speed of 03 m / min. The immersion time is about 70 minutes. As a result, the core resin can be continuously cured and pulled up, and a fiber having stable transmission characteristics without any small bend was obtained.

FIG. 2 is a perspective view of the winding bobbin 13, and it is effective to attach a guide plate 16 coated with a fluororesin on the surface thereof, because it is possible to prevent the landslide even if the wound tube 7 becomes loose.

The guide plate 16 may be a guide roller, a heat resistant belt, or the like.

As described above, according to this embodiment, the winding of the tube on the winding bobbin and the withdrawal of the tube are continuous operations, and the working efficiency can be improved. In addition, it is possible to improve the transmission characteristics by eliminating the small bending of the tube that occurs when winding the winding bobbin.

[Advantages of the Invention] According to the present invention, the drawbacks of the prior art can be solved and the working efficiency in the plastic fiber molding process can be improved, while the small bending of the tube wound around the take-up bobbin can be eliminated for transmission. It is possible to obtain a plastic fiber molding device capable of improving the characteristics.

[Brief description of drawings]

FIG. 1 is a sectional view of a winding bobbin according to an embodiment of the present invention, FIG. 2 is a perspective view of the winding bobbin of FIG. 1, and FIG. 3 is a structural view of equipment showing a conventional plastic fiber molding line. FIG. 4 is a sectional view of the winding bobbin of FIG. 1: Tank, 2: Pressurizing device, 3: Rotary joint, 6: Delivery reel, 7: Tube, 13: Take-up bobbin, 15: Lifting reel.

Claims (1)

[Scope of utility model registration request] 1. A fluororesin tube filled with an acrylic resin core material is wound around a winding bobbin installed in a warm liquid and heated and cured while being immersed in the warm liquid. In a plastic fiber molding apparatus, the tubes are aligned and wound around a body portion of the winding bobbin, and the winding bobbin is provided with the tube so that the tube is pulled out from the winding side of the body portion while winding the tube. A plastic fiber molding device, characterized in that a barrel portion having a taper is provided such that the diameter on the pull-out side is smaller than the diameter on the winding side.