JPH0613226Y2 - Flat glass transfer roll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a plate glass transfer roll used in a plate glass manufacturing process, particularly in a float glass plate manufacturing process.

[Conventional technology and its problems]

In the plate glass manufacturing process by the float method, molten glass is sent out from a furnace onto a molten tin bath, is sent in a band-like floating state on the tin bath, and then passes through a slow cooling kiln (layer) to perform a cutting process. Sent to. Conventionally, in this manufacturing process, molten tin adheres to the lower surface of the glass band when passing over the tin bath, and after the layer adheres to the transfer roll surface to form protruding foreign matter, which damages the lower surface of the succeeding glass band. Further, there is a problem that glass powder generated by cutting or the like in the cutting step or the like adheres to the transfer roll surface and similarly damages the lower surface of the succeeding glass strip.

As a means for solving these problems, Japanese Utility Model Publication No. 56-40821 discloses a plate glass transfer roll including a rotating shaft, a plurality of fluororesin rings, and a member that concentrically attaches the rings to the rotating shaft. It is mentioned that since the roll surface, that is, the outer surface of the fluororesin ring is hard to wet and has a good slipperiness, tin is hard to adhere and glass powder is hard to adhere.

General resin including fluoro rubber, plasticizer for rubber,
Since it contains additives such as oils and fats and fillers,
In the temperature range near 0 ° C. or higher, they easily leach out on the glass surface to form so-called roll marks. On the other hand, the fluororesin does not require addition of a plasticizer or the like, and is also excellent in electrical insulation, but on the other hand, it is easy to generate static electricity, and it is difficult to suppress adhesion of dust and glass powder due to it, and eventually glass scratches occur. Cause. Further, the fluororesin does not easily adhere to metal or the like, and the molded product has to be locked to the shaft through the mounting member as disclosed in the prior example, so the installation is not easy and the cushioning property is poor. When glass powder adheres, it is difficult to avoid scratching the glass.

The present invention eliminates the problems of these fluororesins and provides an improved sheet glass transfer roll.

[Means for solving problems]

According to the present invention, a rotating shaft, a disk member attached to the rotating shaft, and a flexible fluororesin made of a copolymer of a fluorine-containing crystalline resin segment and a fluorine-containing rubber segment is attached to the outer peripheral surface of the disk member. The present invention provides a plate glass transfer roll comprising a rubber elastic body interposed between a disk member and a flexible fluororesin.

In the flexible fluororesin of the present invention, the fluororubber segment, that is, an elastic polymer having a composition of fluororubber means a polymer having a large amount of amorphousness. Conventionally known is vinylidene fluoride (hereinafter referred to as “vinylidene fluoride”). A copolymer of VDF and hexafluoropropane (hereinafter abbreviated as HFP), a copolymer of VDF and hexafluoroacetone, VDF and HFP and tetrafluoroethylene (hereinafter TFE)
And abbreviated), VDF and chlorotrifluoroethylene (abbreviated as CTFE hereinafter), TFE and propylene copolymer, TFE and fluorine-containing vinyl ether copolymer and carbonization. There are copolymers of hydrogen-based diene compounds and fluorine-containing monomers.

On the other hand, the fluorine-containing crystalline resin segment, that is, the polymer, polytetrafluoroethylene, polychlorotrifluoroethylene, polytrifluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, a copolymer of VDF and TFE, TFE and There are copolymers with ethylene, CTFE with ethylene, and copolymers with TFE and fluorine-containing vinyl ether.

A flexible fluororesin can be obtained by graft-copolymerizing or random-copolymerizing these.

In the case of the graft copolymer, the applicant first copolymerizes a fluororesin segment as a trunk resin and a monomer having a double bond peroxy bond, for example, t-butylperoxymethacrylate, t-butylperoxyallylcarbonate and the like. By polymerizing and decomposing the peroxy group contained in the trunk resin in the next step, and initiating the polymerization of the fluorine-containing crystalline resin segment which is the branch resin from the radicals generated, the fluorine-containing crystalline resin segment and It has been found that a graft copolymer comprising a fluorine-containing rubber segment can be obtained.

Alternatively, the fluorine-containing rubber segment as described above and the fluorine-containing crystalline resin segment may be randomly copolymerized using a polymerization catalyst such as heptafluorobutyryl peroxide.

The flexible fluororesin obtained by these copolymers has excellent characteristics such as resistance to acidic gas similar to fluororesin such as SO _{2 in the layer} , CO ₂ gas, heat resistance and the like, and its hardness. Improves brittleness and has flexibility like that of fluororubber, on the other hand, a drawback of fluororubber, that is, inferior acid gas resistance, or forming a trace of roll on glass by mixing a crosslinking agent or a filler. This is to eliminate the drawbacks such as easy operation.

Although the physical properties of the obtained flexible fluororesin vary depending on the kind and amount ratio of the fluororubber segment and the fluorocrystalline resin segment, the polymerization rate, etc., the Shore D hardness is 40 to 50.
Fluororesin is about 60 or more, but it is flexible, and the insulation resistance related to the generation of static electricity, dust, and the adhesion of fine glass powder is about 10 ¹⁴ Ω ・ cm. For example, polytetrafluoroethylene, perfluoroalkoxy ether resin, etc. have a resistance of 10 ¹⁸ Ω · cm or more, but are as low as 1/10000 or less, and static electricity is less likely to occur and electrostatic attraction is also low.

Further, since it has a large adhesive force to a metal or rubber elastic body, it can be easily adhered to a metal disk member or a rubber elastic body arranged on the disk member. For example, in the latter example, a disk member with rubber preforms is placed in the mold, and a flexible fluororesin granule or block is placed around the rubber preforms and heat-pressed at around 200 ° C. Thus, the rubber can be integrally molded at the same time as the heat-vulcanizing treatment.

Since the transfer roll having the rubber elastic body interposed between the disk member and the flexible fluororesin has more cushioning property, even if the glass powder adheres to the roll surface, it does not damage the glass surface.

Flexible fluororesin is hard to wear, so a few mm on the rubber elastic body
It only needs to be covered to some extent, which is advantageous in terms of cost.

Further, since it has excellent cushioning properties as described above, it does not cause the glass to dance even in the case of slight vibration of the roll as in the case of the conventional fluororesin, and is suitable for transfer on an inclined gradient.

〔Example〕

Hereinafter, the present invention will be illustrated with reference to the accompanying drawings. 1 and 2 are a perspective view and a partial cross-sectional view of the present invention, in which a metal disk member 2 is attached to a rotary shaft 1 and a flexible fluororesin 4 is attached to the outer periphery thereof via a neoprene rubber 3. It is glued. Of course, the flexible fluororesin 4 may be directly adhered to the disc member 2, but it is more advantageous to interpose the rubber elastic body through the rubber elastic body because the cushioning property is caused and the glass is less likely to be damaged.

To integrate the disc member with neoprene rubber and flexible fluororesin, place the disc member, rubber preform, and flexible fluororesin pellets in the mold as described above, and heat and press at around 200 ° C. Good.

By arranging the transfer roll thus formed in the rear portion of the layer or in the cutting step region, it is possible to reduce the generation of roll marks of glass, the generation of scratches due to glass powder and the like, and improve the production yield.

(Test Example 1) A plurality of transfer rolls using the Central Glass Co., Ltd. product name "Sefraral Soft" 4 in the configuration shown in FIG. 1 are set in the lower layer region (temperature 150 ° C. or less) in the float glass manufacturing process. Case (Example), 3, in FIG.
A case in which a plurality of transfer rolls having neoprene rubber integrated in four parts are set (Comparative Example 1), Jitsuko Sho 56-408
A comparison test was carried out on a case (Comparative Example 2) in which a plurality of transfer rolls having the polytetrafluoroethylene resin ring disclosed in No. 21 were set. When the generation of roll marks on the plate glass was examined behind the layer exit, Comparative Example 1 had the most marked roll marks, but it was scarcely observed in Comparative Examples 2 and Examples.

(Test Example 2) The transfer rolls having the configurations of the above-mentioned Example and Comparative Example 2 were respectively added to the rear portion of the layer and attached to the cutting step, and the occurrence of scratches on the glass surface (roll contact surface) after conveyance was observed. In Comparative Example 2, 30 pieces / 10,000 m ^{2 were} recognized, whereas in Example, the number was reduced to at least about 80% or less, and the production yield was improved accordingly.

[Effect of device]

ADVANTAGE OF THE INVENTION According to this invention, adhesion of tin and glass fine particles to a transfer roll is suppressed, the generation | occurrence | production of a roll trace and a scratch to a sheet glass is reduced, and there exists an effect that the production yield of sheet glass can be improved.

[Brief description of drawings]

1 and 2 are a perspective view and a partial front sectional view of a sheet glass transfer roll according to the present invention. 1 ... Rotary axis, 2 ... Disk member 4 ... Flexible fluororesin

Claims (2)

[Scope of utility model registration request] 1. A flexible fluororesin comprising a copolymer of a fluorine-containing crystalline resin segment and a fluorine-containing rubber segment on a rotary shaft, a disc member axially attached to the rotary shaft, and an outer peripheral surface of the disc member. A plate glass transfer roll characterized by being adhered. 2. The plate glass transfer roll according to claim 1, wherein a rubber elastic body is interposed between the disk member and the flexible fluororesin.