JP2000255664A - Packing of optical fiber preform - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breakage of a plastic film caused by the contact of optical fiber preforms, and to prevent the optical fiber preforms from being exposed, polluted or damaged by covering one optical fiber preform at least by a double plastic film. SOLUTION: In the packing to store and carry optical fiber preforms 10, one optical fiber preform 10 is packaged by a first layer plastic film 1, and further packaged by a second layer plastic film 2 over the first layer plastic film 1. These plastic films 1, 2 are formed of poly vinyl chloride, and joints 1a, 2a of the plastic films 1, 2 are connected to each other through heat seal. The breakage of the plastic films 1, 2 caused by the contact of the adjacent optical fiber preforms with each other can be prevented in collectively storing and carrying a plurality of optical fiber preforms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package for storing and transporting an optical fiber preform.

[0002]

2. Description of the Related Art An optical fiber is obtained by drawing an optical fiber preform as a raw material. If the optical fiber preform has a foreign substance or a scratch, it is easily broken during the drawing process, and even if the drawing can be performed, the transmittance of the optical fiber is inferior or the fiber is easily broken. Therefore, in order to obtain high-quality optical fiber, it is necessary to pack the optical fiber preform with care to prevent foreign substances from adhering or scratching when storing and transporting it. There is. In the unlikely event that the package is damaged and foreign matter adheres to the optical fiber preform, the surface must be cleaned before drawing, and if scratched, the surface must be smoothed by flame polishing.

[0003] Therefore, conventionally, an optical fiber preform is surrounded by paper or a plastic film, an open place is closed and packed in a bag shape, and at the time of shipment, the packed optical fiber preform is filled with a styrene foam chip or the like. Was transported in the box.

[0004]

However, since the paper or plastic film surrounding the optical fiber preform is single-layered, if the paper or plastic film rubs against each other or if the cut ends at both ends of the optical fiber preform are protruded, the paper or plastic film will not be formed. However, there were not a few problems such that the optical fiber preform was exposed and foreign matter adhered or scratched. The present invention has been made in order to eliminate such a problem, and an object of the present invention is to provide a package in which an optical fiber preform is not exposed during storage and transportation.

[0005]

According to a first aspect of the present invention, there is provided a package for an optical fiber preform according to the present invention, wherein one of the optical fiber preforms is covered with at least a double plastic film. And

By covering the optical fiber preforms one by one with a double plastic film as described above,
When storing and transporting multiple optical fiber preforms together, damage to the plastic film due to contact between adjacent optical fiber preforms and damage to the plastic film due to the projections at both ends of the preform can be prevented. Exposure can be prevented from being stained or damaged. Further, by making the plastic film double, it is possible to reduce an impact force that causes a scratch or internal distortion.

A method of packing an optical fiber preform according to the present invention is characterized in that after winding one optical fiber preform with a sheet-shaped plastic film, heat sealing is performed on three sides, that is, one side and both sides of the film. And

[0008] It is preferable that the optical fiber preform is wrapped around the sheet-like plastic film in a multiplex manner.

In another aspect of the present invention, there is provided a method for packing an optical fiber preform, wherein one optical fiber preform is inserted into a cylindrical film, and then an end of the cylindrical film is heat-sealed.

[0010] It is preferable that the cylindrical film is multiplexed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a view showing an embodiment of packaging of an optical fiber preform to which the present invention is applied. In the packaging of this embodiment, one optical fiber preform 10 is wrapped with the first layer of plastic film 1 and further superimposed on the first layer of plastic film 1 for 2 hours.
It is wrapped in the plastic film 2 of the layer.

The plastic films 1 and 2 are both vinyl chloride. Plastic films 1 and 2
The seams 1a and 2a of each film packaged by the above are connected by heat sealing.

Incidentally, examples of the material of the plastic film are as follows.
Polyethylene, polyester,
Polypropylene. The seam of the film wrapped with the plastic film may be bonded by an adhesive, a high-frequency welder, or affixed by a tape with a single-sided or double-sided adhesive. Further, it is optional to change the material and thickness of the plastic film, the way of bonding the film seam, and the form of packing between the first and second layers.

FIG. 2 is a view showing an example of a method of packing an optical fiber preform to which the present invention is applied, in the middle of implementation. In the packing method of this embodiment, the thickness 100
One optical fiber preform 10 is placed on a μm vinyl chloride sheet film 5, and the film 5 is wound around the optical fiber preform 10 while being unwound from a roll. When the single winding is completed, the film 5 is cut while leaving a margin of an appropriate length, and the edge 5a1 and both sides 5a of the film 5 are cut.
a2 and 5a3 are heat-sealed, respectively. Next, the film 5 is further wound on it and cut, and the optical fiber preform 10 is double-packed with the film 5 by heat-sealing the three sides of the end side and both sides.

When the film 5 is wound around the optical fiber preform 10 while being unwound from a roll,
If the film 5 is cut after being wound multiple times and the edges and side edges are sealed, multiple packaging can be performed by one operation.

FIG. 3 is a diagram showing an example of a method of packing an optical fiber preform according to another embodiment to which the present invention is applied, in the middle of implementation. In the packing method of this embodiment, one optical fiber preform 10 is inserted into a cylinder of a 30 μm-thick polyethylene film 6 which is formed into a tubular shape by inflation and wound on a roll. The film 6 is cut while leaving a margin, and both ends 6a and 6b are heat-sealed respectively. This is inserted into the cylinder of the polyethylene film 6 again, the film 6 is cut, and both ends are heat-sealed respectively.
The optical fiber preform 10 is double-packed with the film 6.

[0017]

As described above in detail, according to the packaging of the optical fiber preform to which the present invention is applied, since the optical fiber preforms are covered one by one with multiple plastic films, a plurality of optical fiber preforms are covered. When storing and transporting the reforms together, it is possible to prevent the plastic film from being damaged by the contact between adjacent optical fiber preforms, and prevent the optical fiber preforms from being exposed and soiled or damaged.
In addition, an impact force that does not cause scratches or internal strain can be reduced. Therefore, the yield of drawing the optical fiber from the optical fiber preform is improved, and the performance such as the transmittance of the completed optical fiber becomes a stable value. Further, there is almost no need to clean the surface of the optical fiber preform or to smooth it by flame polishing before drawing the optical fiber.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of packaging of an optical fiber preform to which the present invention is applied.

FIG. 2 is a diagram illustrating an example of a method of packing an optical fiber preform to which the present invention is applied, in the middle of implementation.

FIG. 3 is a view showing an example of a method of packing an optical fiber preform according to another embodiment to which the present invention is applied, in the middle of implementation.

[Explanation of symbols]

1 is a first-layer plastic film, 2 is a second-layer plastic film, 1a and 2a are seams of the film, 5
Is a vinyl chloride sheet film, 5a1 is an edge of the film, 5a2 and 5a3 are both sides of the film, 6 is a polyethylene film, 6a and 6b are edges, and 10 is an optical fiber preform.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Hideo Hirasawa 2-13-1, Isobe, Annaka-shi, Gunma F-term in Shin-Etsu Kagaku Kogyo Co., Ltd. Precision Materials Laboratory 3E096 AA01 BA03 BA30 BB01 CA05 CB01 DA03 EA02X FA03 GA01 GA11

Claims (5)

[Claims] 1. A packaging for an optical fiber preform, wherein one of the optical fiber preforms is covered with at least a double plastic film. 2. A sheet-like plastic film made of 1
3. A method for packing an optical fiber preform, comprising winding an optical fiber preform into a book and heat-sealing three sides of the film, one end side and both sides. 3. The method of packing an optical fiber preform according to claim 2, wherein the winding of the optical fiber preform by the sheet-like plastic film is multiplexed. 4. A method for packing an optical fiber preform, comprising inserting one optical fiber preform into a cylindrical film and heat sealing an end of the cylindrical film. 5. The method for packaging an optical fiber preform according to claim 4, wherein the cylindrical film is multiplexed.