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Glass bottle stripe and the types and causes of knot
by：Lisson
2020-11-11
Stripe and knot
the types and causes of vitreous stripe inclusions and knot are glassy state, and its composition and properties different from glass body, stripes and knot destroy the uniformity of the glass, it can destroy the appearance of the glass products, to reduce the mechanical strength of glass, thermal shock resistance and chemical homogeneity, in fact it is difficult to be completely flat glass, ordinary glass products there is a certain degree of homogeneity, the heat resistant performance and pervious to light performance requirements of products is allowed to exist.
according to different causes, the stripe and knot can be divided into: melted uneven, kiln self-closed droplets of glass, refractories and stone melt four eroded.
( 1) Melted uneven stripes and knot
mixed uneven, produce the batch of the batch of the particles of the batch of delamination, uneven, some components of the way of loading is properly after melting diffusing powder flying or some components, melted when some components from the vitreous surface volatilization, causes the surface of the glass melt composition and internal inconsistencies, homogenization temperature system is broken, and the homogenization process, melted temperature instability, unfinished cause freezing area glass to flow, as well as the selection of the batch of broken glass with the principal part of glass composition difference is too big and the number of a lot more than broken glass.
these are the stripes and the cause of the knot, this kind of stripe and knot are often rich in silicon dioxide, general performance for the stripes, and scattered in the glass. Method of remove the stripes appear in addition to carefully mixing or will be pressed into the batch of the batch of blocks, must strictly abide by the melt temperature system.
( 2) Kiln self-closed glass drops of stripe and knot
as I mentioned earlier, kiln self-closed and cliffs, the crucible formed by alkali airflow silicate melt, reach a certain weight and viscosity, is in glass droplets form drip or flow of glass melt, silica self-closed and parts of the kiln was formed by the droplet belong to the rich silica glass quality, kiln wall and the crucible refractory was that hang 'formed by the glass drops belong to the rich quality of alumina, both glass drops of viscosity is very big, in the glass melt diffusion is slow, eventually forming stripes and nodules.
the self-closed stone formation and kiln for the same reason, so to eliminate this kind of method of stripe and knot also is the same: careful selection and laying fire-proof material, to prevent temperature is expected to float in the sky and strictly abide by the system.
( 3) Refractory erosion of stripe and knot section
the stripes and tumor is one of the most often produce, glass melt is corrosive medium, to contact with it of kiln self-closed big brick or crucible can damage, broken part may be in crystalline state fall into glass stone formation in the body, may also form a glassy state substances dissolved in the glass. Mostly for refractory clay refractory material, glass melt after eroded, added to improve the viscosity of component in vitreous along the kiln wall, brick and crucible of serious heterogeneity, due to erosion was conducted continuous uniform, so the general formation of aluminum oxide.
refractory erosion is the root of the most dangerous, especially for glass erosion sex strong, this kind of erosion stripe is almost unable to prevent, eliminate the stripe method is mainly to improve the quality of the erosion resistance of refractories, there are: laying fire-proof material carefully, in the bottom of the crucible coating a layer of glass melt first, soda powder is not direct contact with the refractory material, kiln wall cooling, to abide by the system temperature, avoid high temperature.
( 4) Stone melt stripe and knot
stripe and knot sometimes related to the concretion, because the stones in glass melt by the effect of glass melt, gradually dissolve at different speed, when stone has a larger solubility and stay in high temperature can disappear after a certain amount of time, stone dissolved after the glass melt and the main body of glass with different chemical composition, to form knot, or stripes, the composition of the stripe and knot corresponding Yu Jieshi species. To prevent this kind of knot and the method of stripe is the most important of prevent stones.
the types and causes of vitreous stripe inclusions and knot are glassy state, and its composition and properties different from glass body, stripes and knot destroy the uniformity of the glass, it can destroy the appearance of the glass products, to reduce the mechanical strength of glass, thermal shock resistance and chemical homogeneity, in fact it is difficult to be completely flat glass, ordinary glass products there is a certain degree of homogeneity, the heat resistant performance and pervious to light performance requirements of products is allowed to exist.
according to different causes, the stripe and knot can be divided into: melted uneven, kiln self-closed droplets of glass, refractories and stone melt four eroded.
( 1) Melted uneven stripes and knot
mixed uneven, produce the batch of the batch of the particles of the batch of delamination, uneven, some components of the way of loading is properly after melting diffusing powder flying or some components, melted when some components from the vitreous surface volatilization, causes the surface of the glass melt composition and internal inconsistencies, homogenization temperature system is broken, and the homogenization process, melted temperature instability, unfinished cause freezing area glass to flow, as well as the selection of the batch of broken glass with the principal part of glass composition difference is too big and the number of a lot more than broken glass.
these are the stripes and the cause of the knot, this kind of stripe and knot are often rich in silicon dioxide, general performance for the stripes, and scattered in the glass. Method of remove the stripes appear in addition to carefully mixing or will be pressed into the batch of the batch of blocks, must strictly abide by the melt temperature system.
( 2) Kiln self-closed glass drops of stripe and knot
as I mentioned earlier, kiln self-closed and cliffs, the crucible formed by alkali airflow silicate melt, reach a certain weight and viscosity, is in glass droplets form drip or flow of glass melt, silica self-closed and parts of the kiln was formed by the droplet belong to the rich silica glass quality, kiln wall and the crucible refractory was that hang 'formed by the glass drops belong to the rich quality of alumina, both glass drops of viscosity is very big, in the glass melt diffusion is slow, eventually forming stripes and nodules.
the self-closed stone formation and kiln for the same reason, so to eliminate this kind of method of stripe and knot also is the same: careful selection and laying fire-proof material, to prevent temperature is expected to float in the sky and strictly abide by the system.
( 3) Refractory erosion of stripe and knot section
the stripes and tumor is one of the most often produce, glass melt is corrosive medium, to contact with it of kiln self-closed big brick or crucible can damage, broken part may be in crystalline state fall into glass stone formation in the body, may also form a glassy state substances dissolved in the glass. Mostly for refractory clay refractory material, glass melt after eroded, added to improve the viscosity of component in vitreous along the kiln wall, brick and crucible of serious heterogeneity, due to erosion was conducted continuous uniform, so the general formation of aluminum oxide.
refractory erosion is the root of the most dangerous, especially for glass erosion sex strong, this kind of erosion stripe is almost unable to prevent, eliminate the stripe method is mainly to improve the quality of the erosion resistance of refractories, there are: laying fire-proof material carefully, in the bottom of the crucible coating a layer of glass melt first, soda powder is not direct contact with the refractory material, kiln wall cooling, to abide by the system temperature, avoid high temperature.
( 4) Stone melt stripe and knot
stripe and knot sometimes related to the concretion, because the stones in glass melt by the effect of glass melt, gradually dissolve at different speed, when stone has a larger solubility and stay in high temperature can disappear after a certain amount of time, stone dissolved after the glass melt and the main body of glass with different chemical composition, to form knot, or stripes, the composition of the stripe and knot corresponding Yu Jieshi species. To prevent this kind of knot and the method of stripe is the most important of prevent stones.
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