JP3197440U - Spiral tube in close contact with the electrode - Google Patents

Abstract

A spiral shrink tube for holding a thin and wide-area electrode for a long time is provided. A thin film tape 6 having an adhesive applied to one side of a vertically stretched film is wound around a fixed core member 8 in an oblique direction with the adhesive surface facing upward, and further bonded from above. When the thin tape 7 without agent is shifted by half a width and wound in an oblique direction, a spiral tube is formed by bonding the upper and lower thin tapes with an adhesive, and when a fixed core is pulled out, a hollow spiral tube is formed. A spiral shrink tube that can be coated with a coating material and heated, and the film shrinks and can be coated firmly. [Selection] Figure 5

Description

The present invention is a technology for manufacturing a cover material for covering electrodes such as solar cells. Durability is required for a very long period of time, assuming the application, and the shape change is minimal as well as the durability of the material. It is a material and a processing technique that are required to be maintained at the same level.

In relation to the thinness of the silicon wafer of the solar cell, it is necessary to make the electrode for extracting electricity as thin as possible. In order to hold a thin and wide-area electrode for a long period of time, various coating materials have been studied.

Copper plates have come to be used for electrode removal, but it is very difficult to coat thin flat plates, especially for applications that require long-term durability. The demand for low shape change is high.

When using a copper plate electrode, various sizes are required depending on the capacity of the solar cell and the distance to be taken out. There is a need for technology and equipment to produce various sizes in a short time.

Japanese Patent Application No. 10-283756 Shrink tube and manufacturing method thereof Japanese Patent Application No. 2001-301067 Shrink tube with tear line excellent in resistance to tearing bag Japanese Patent Application No. 2012-142048

When a solar cell electrode is led to the outside, a normal round electric wire has a thickness, and the thickness becomes an obstacle when the solar cell is sealed. In view of this, a method has been put into practical use in which a thin copper flat plate is cut into a certain width or a copper wire is pressed to be processed into a thin flat plate shape so that a necessary current can flow. However, if the copper flat plate is used as it is, there is a concern that the quality is deteriorated due to surface corrosion or deterioration in long-term use over 20 years.

In order to prevent corrosion of the copper flat plate, a resin cover material can be considered. A method is conceivable in which a resin is attached to the electrode and the resin is contracted to closely contact the copper flat plate to block air and prevent the copper flat plate from being deteriorated. However, in long-term use, the resin shrinkage is relaxed, and air enters between the copper flat plate, which may cause deterioration of the copper flat plate.

Ordinary shrink film can shrink in the vertical and horizontal directions at the same time, but once it shrinks, it will not shrink unless it is heated again, and the shrinkage loosens and adheres in an environment exposed to sunlight for a long time. There is a problem with sex.

The shrink film that wraps the copper flat plate is a biaxially stretched film that has been stretched vertically. This biaxially stretched film is produced by combining two or more kinds. One type is the one with the adhesive applied to the surface of the film, the other type is the one without the adhesive, and this film is slit to a certain width, with the adhesive-attached slit film (7) as the lower layer and the upper layer. A spiral tube is formed by winding a slit film without adhesive.

When a copper flat plate is put into the spiral tube (9) and heated, the spiral tube contracts and comes into close contact with the copper flat plate.

The biaxially-stretched spiral tube is in close contact with the copper flat plate (10), and at the same time, the residual shrinkage (11) is always exerted in a spiral shape, and the contraction force continues and can withstand long-term use.

For solar cells and the like that are used for 20 years or more for a long period of time, those that cannot be held only by vertical and horizontal contracting forces but are semipermanently acting are required.
For this purpose, a spiral tube in which residual shrinkage (11) occurs in a bias shape is suitable.

For the biaxially stretched film, PET is usually optimal, but any material can be used as long as it is a film that can be biaxially stretched, such as PPS, PP, and PE. However, it is necessary to select materials that meet the required functions such as heat resistance, weather resistance, and gas resistance.

When coated with a spiral shrink tube, it can withstand long-term use, and is always biased in force, maintaining close contact with the coated body for a long period of time.

If a heat-sealing film or a heat-sealing resin is provided inside the spiral tube, these resins are heat-sealed in the heat shrinking process and are in close contact with the covering, thereby contributing to long-term quality maintenance.

Needs by size of spiral tube are high, there are many types of electrode lengths and widths, and in order to respond optimally to them, by preparing various types of fixed core materials for spiral tubes that require supply of various types of sizes, A small amount of many varieties can be supplied.

To finish a biaxially stretched film stretched vertically and horizontally into a spiral tube, as shown in Fig. 5, first wrap the tape with adhesive on the fixed core with the adhesive surface facing upward, and then the thin tape without adhesive. When the lower layer end and the upper layer end are wound so as not to overlap, and the upper and lower layers are firmly bonded, a plastic cylindrical spiral tube is formed.

If a thin tape with adhesive is further wound on the thin tape with adhesive, a thick, strong spiral tube with two layers, three layers, or four layers can be produced. A thin tape without adhesive is wound only on the top layer. And we can make a spiral tube with excellent strength and toughness according to the application.

A heat-adhesive film or a heat-adhesive resin is provided inside the spiral tube in advance, and the resin on the inner side melts in the process of heat-shrinking the spiral tube, so that the adhesion can be further maintained.

Stretch direction of wide film with adhesive Fine tape cut from wide film with adhesive Wide film without adhesive Fine tape cut from wide film without adhesive Narrow tape wrapped around a fixed core Put the spiral tube on the copper plate Shrink and fix the spiral tube

1. Wide film 2 with adhesive, wide film 3 without adhesive, stretching 4 in the transverse direction, stretching 5 in the vertical direction, slit 6, thin tape 7 with adhesive, thin tape 8 without adhesive, fixed core material 9, spiral tube 10, copper flat plate 11, contraction force 12 applied to the bias shape, shrinking spiral tube

Claims (3)

Adhering a thin tape (6) with an adhesive applied to a vertically stretched film and a thin tape (7) with no adhesive wrapped around the fixed core (8) while wrapping around the upper and lower layers A spiral shrink tube in which a spiral tube is formed, coated on a coated core material (10) such as a copper flat plate and heated, whereby the film contracts and the coating material can be firmly coated. In the process of applying or pasting a hot melt adhesive or a hot melt film in advance to the inside of the spiral tube and shrinking the spiral tube by heating, the spiral tube can be firmly fixed to the coating material by heat. The spiral shrink tube according to claim 1. When forming a tube by winding a narrow tape of stretched film around a fixed core material (8), the tube inner diameter can be easily set in a small lot by changing the thickness of the fixed core material. The spiral shrink tube according to claim 1.

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