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A mold and method for preparing an extruded plastic optical fiber with a spider web structure

A plastic optical fiber and spider web technology, which is applied in the field of molds for preparing plastic optical fibers with a spider web structure, can solve problems such as optical fiber quality degradation, and achieve the effects of small allowable bending radius, small transmission loss, and low manufacturing cost

Inactive Publication Date: 2012-02-22
JIANGSU HENGTONG PHOTOELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing plastic optical fibers are generally prepared by wire drawing, and there are also preparation methods that combine wire drawing and extrusion at the same time. In general laboratories, both solid-core plastic optical fibers and plastic optical fibers with holes must use wire drawing. The core plastic optical fiber adopts the extrusion method in batches, and some companies also use the extrusion method to realize the photonic crystal optical fiber (with a round hole), but compared with the wire drawing method, the quality of the optical fiber is reduced, and the plastic optical fiber with the spider web structure has not yet been prepared at home and abroad. method

Method used

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  • A mold and method for preparing an extruded plastic optical fiber with a spider web structure
  • A mold and method for preparing an extruded plastic optical fiber with a spider web structure
  • A mold and method for preparing an extruded plastic optical fiber with a spider web structure

Examples

Experimental program
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specific Embodiment

[0030] The rear end of the mold core includes an approximately cylindrical part and an approximately truncated conical part, the approximately cylindrical part is integrated with the approximately truncated conical part, and the approximately cylindrical part is connected to the larger end of the approximately truncated conical part; The approximately cylindrical part is in contact with the splitter cone of the machine head, and the front end of the mold core is inserted into the end of the approximately frustoconical part with a small radius.

[0031] Of course, the shape of the rear end of the mold core can be any other suitable shape, as long as it can ensure that one end is connected to the splitter cone, and the other end is connected to the front end of the mold core, so that the constant pressure air or nitrogen introduced from the splitter cone can be introduced into the mold. Each fan-shaped micropipe at the front end of the core is sufficient.

[0032] As for the mol...

example 1

[0039] A product (outer diameter about 2mm) is achieved with an extrusion stretching ratio of 5:1, and then the first differential stretching (speed differential stretching ratio 3:2) to form an intermediate product with an outer diameter of about 1.3mm , and finally through the second speed differential stretching (speed differential stretching ratio 3:2) to form the final product (outer diameter about 0.85mm).

example 2

[0041] A product (outer diameter about 1.6mm) is achieved with an extrusion stretching ratio of 5:1, and then the first speed differential stretching (speed differential stretching ratio 3:2) to form an intermediate product with an outer diameter of about 1.05mm The product is finally subjected to the second speed differential stretching (speed differential stretching ratio 3:2) to form the final product (about 0.7mm in outer diameter).

[0042] In the above two embodiments, the outer diameter of the primary product in one embodiment is 2.0 mm, and the outer diameter of the primary product in the other embodiment is 1.6 mm, which is caused by the difference in mold size. The above examples can be changed according to the change of the mold, and can also be changed by changing the stretch ratio, and can also be changed by changing the number of times of speed difference stretching. At present, the present invention can achieve an outer diameter below 0.5mm.

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Abstract

The invention provides a die for preparing plastic optical fiber of a plastic extruded spider web structure and a method thereof, wherein the die comprises a die core and a die sleeve, the die core comprises a die core back end and a die core front end; the die core back end is connected with a flow split cone of a machine head, the die core front end consists of a plurality of layers of fan-shaped micro-pipes, the fan-shaped micro-pipes are gradually enlarged from a middle shaft line of the die core to the flange, non-cross clearances of the fan-shaped micro-pipes are shaped like multiple layers of concentric circles, cross clearances are shaped like a sign which is composed by overlapping + with x; and the die core front end and the die core back end are conducted through the fan-shaped micro-pipes. When in extrusion production, constant-pressure air or nitrogen is directly led into the die core back end from the flow split cone, then led into all the fan-shaped micro-pipes through the die core back end and finally led out of all the fan-shaped micro-pipes; and plastic is extruded between the outer surface of the die core and the die sleeve under a certain pressure and directly infused to the clearances among the fan-shaped micro-pipes at the die core front end. The invention realizes the spider web structure by the simple and reasonable method for the first time and ensures the integrity of the spider web structure.

Description

technical field [0001] The invention relates to a plastic optical fiber preparation technology, in particular to a mold and a method for preparing plastic optical fibers with a spider web structure by an extrusion method. Background technique [0002] Existing plastic optical fibers are generally prepared by wire drawing, and there are also preparation methods that combine wire drawing and extrusion at the same time. In general laboratories, both solid-core plastic optical fibers and plastic optical fibers with holes must use wire drawing. The core plastic optical fiber adopts the extrusion method in batches, and some companies also use the extrusion method to realize the photonic crystal optical fiber (with a round hole), but compared with the wire drawing method, the quality of the optical fiber is reduced, and the plastic optical fiber with the spider web structure has not yet been prepared at home and abroad. method. [0003] The theory of plastic optical fiber with spi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/12B29C47/00B29C47/08B29C69/02B29C55/00B29L11/00B29C48/30
Inventor 王英明周春东马建林吴志平吴金华蔡迪
Owner JIANGSU HENGTONG PHOTOELECTRIC