[China Glass Net] The glass ball is a raw material for the production of continuous glass fiber by using a sputum drawing furnace; while the kiln method of the kiln is directly used as a raw material for the production of the glass ball with its own production characteristics.

First, the manufacturing process of glass balls

The raw materials for the glass ball are mostly natural ore. Therefore, in order to manufacture the glass ball, various ores are first pulverized, processed into a powder, and then a batch is prepared according to the glass component, and sent to a glass melting furnace for melting to form a glass liquid. Qualified glass flows through the feed tank and exits the feed port to form a strand. The temperature of the stock, the medium alkali glass is generally 1150 to 1170 ° C, and the alkali-free glass is 1200 to 1220 ° C. The strands were cut into billets by nearly 200 times per minute. The ball blank passes through the chute and the ball splitter, and is moved by the ball dividing plate, respectively, rolled into different funnels, and then falls into a ball forming groove formed by three rollers having the same rotating direction. The ball blank rotates on the roller and its surface tension acts to gradually form a smooth round glass ball. The size of the diameter is determined by the thickness of the glass stream, the flow rate, and the speed of the scissors.

When the glass ball is away from the roller, the temperature is still very high. In order to prevent the ball from sticking, it needs to be cooled by the cold ball disk or the serpentine track. To reduce the residual stress generated by the temperature difference between the inside and outside of the glass ball, it needs to be annealed to slowly cool, then Stored in the ball compartment for quality inspection.

Second, the quality of the glass ball

The quality of the glass ball directly affects the stability of the fiberglass drawing operation and the improvement of labor productivity, so the appearance quality and intrinsic quality of the glass ball must be strictly controlled.

(1) The appearance quality of the glass ball.

(1) The diameter of the glass ball is 19 mm, and the roundness (the difference between the larger radius and the smaller radius) is 5 mm.

(2) Intensive small bubbles of 0.5mm or less in diameter are not allowed in the glass ball. Bubbles above 0.5mm: no more than 15 alkali-free glass balls; no more than 10 medium-alkali balls.

(3) Stones and colored impurities are not allowed to be trapped inside the glass ball.

(4) The surface of the glass sphere is not allowed to have a blasting of more than 5 mm in diameter.

(5) The surface of the glass sphere shall not be contaminated with any oil, alkali powder, rust, severe pitting and other impurities that are not cleaned.

(6) The depth of the scissors of the glass ball shall not exceed 0.5 mm.

(2) The intrinsic quality of the glass ball.

(1) The chemical composition of the glass sphere should be stable and meet the specified requirements.

(2) The composition of the glass sphere should be chemically analyzed frequently and periodically. When there is a problem or the composition fluctuates too much, the number of analyses should be increased until the composition is controlled to the acceptable range.

(3) The chemical uniformity of the glass sphere is good, which is the result of good melting temperature, clarification and homogenization during the melting of the glass sphere.

The current methods of inspection are:

1, uniformity (streak disappearance distance) determination:

The medium alkali ball should not be larger than 27mm.

The alkali free ball should not be larger than 26mm.

2. Determination of secondary bubbling temperature:

The medium alkali glass ball shall not be lower than 1065 °C.

The alkali-free glass ball shall not be lower than 1055 °C.

After the internal quality inspection, any glass ball that meets the technical requirements of chemical analysis, uniformity and secondary bubbling temperature measurement can be judged as a qualified ball.

Third, the washing of the glass ball

Before the glass ball is used, it must be washed, that is, the appearance of the user is re-examined. Generally, the drum type ball washing machine is used to wash the hot water in the water above 80 ° C, and the dust and dirt on the surface of the glass ball are washed. After the cleaned glass ball, the ball is selected according to the appearance quality standard.

The glass ball washed by the ball selection system flows through the bottom mount, and the frosted glass workbench of the fluorescent lamp checks the appearance of the flaw with the naked eye.

(1) Check the diameter of the glass ball with two kinds of porous steel ball screens with apertures of 20.2 mm and 18.8 mm, check the roundness with a vernier caliper, and pick out oversized balls, shaped balls, broken balls, bonded balls, twins. ball.

(2) Picking out bubble balls, raw material stone balls, refractory stone balls, ball balls, alkali-free phase separation balls and crystal balls according to the standard; picking out the oil ball, red ball (rust), white ball (alkali powder) ; pick out deep groove balls and severe scissors.

(3) Generally, 300 packs are used as a batch, and 10 packs are randomly taken from them, and 50 balls are taken from each pack as samples for visual inspection. The stone point is not more than 1% of the sample ball; the total pass rate is not less than 97%. , the batch of balls is qualified for appearance. Otherwise the ball is judged as unqualified.

Qualified glass balls, or bags, or boxes, hang on the drawing unit platform, or lift into the high-position ball box, ball box for use. When in use, it is transported by manual or chute to the ball adding machine.

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