What is the difference between sandblasting and frosting of glass bottles?

Glass containers are widely used in the field of daily chemicals. The frosting and sandblasting processes are used to haze the surface of the glass container, making the glass container hazy and non-slip, which is favored by consumers.

Glass

Glass is made of quartz sand, limestone, feldspar, soda ash, clarifying agent, coloring agent/decolorizing agent, flux, cullet, etc., and the raw materials are melted at 1550-1600 ° C, formed, annealed, cut and other processes. Colorless (white glass) transparent amorphous inorganic substance.

The chemical composition of glass: the main component is SiO2, the content is about 72%, the content of Na2O is about 15%, the content of CaO is about 9%, a small amount of AL2O3, MgO, etc.

It has a series of very valuable properties: transparent, hard, good corrosion resistance, heat resistance and electrical and optical properties; it can be made into products of various shapes and sizes by various molding and processing methods; it can be changed by adjusting its chemical composition properties to suit different usage requirements. In particular, the manufacturing raw materials are abundant and the price is low.

01 Sandblasting

What is sandblasting?

Sandblasting is a conventional abrasive jet, the technology has been continuously developed, improved and perfected. With its unique processing mechanism and wide range of processing and application, it has become more and more popular in today's surface treatment industry and has been widely used in Machinery manufacturing, instrumentation, medical equipment, electronic appliances, textile machinery, printing and dyeing machinery, chemical machinery, food machinery, tools, cutting tools, measuring tools, molds, glass, ceramics, handicrafts, mechanical repairs and many other fields.

Abrasive jet

It refers to the jet formed by the high-speed moving abrasive under the action of some external force. For dry sandblasting, the external power is compressed air; for liquid sandblasting, the external power is the mixed action of compressed air and abrasive pump.

Principle

It uses the high-speed airflow formed when the high-pressure air passes through the fine holes of the nozzle, and blows fine-grained quartz sand or emery to the glass surface, so that the glass surface structure is continuously damaged by the impact of sand particles, forming a rough sandblasting surface The tissue structure of the blasting machine depends on the airflow velocity, the hardness of the sand, especially the shape and size of the sand grains. The fine sand grains make the surface form a fine structure, while the coarse sand grains can increase the erosion speed of the sandblasting surface.

Abrasive

Refers to the medium used in the process of jet flow processing, which can be river sand, sea sand, quartz sand, corundum sand, resin sand, steel sand, glass shot, ceramic shot, steel shot, stainless steel shot, walnut skin, corncob, etc. Different materials and particle sizes are selected according to different sandblasting process requirements.

Application

Clean up the scale, residual salt, welding slag, surface residue, etc. on the surface of various workpieces.

Clean tiny burrs on the surface of various workpieces.

It is used for the pretreatment before coating and plating on the surface of the workpiece to improve the adhesion of the coating and plating.

It is used to improve the performance of mechanical parts, improve the lubrication conditions of mating parts, and reduce the noise of mechanical operation.

It is used for surface strengthening treatment, stress relief, and improvement of fatigue strength and corrosion resistance of parts.

It is used for refurbishment of old parts and rework of unqualified products.

It is used for cleaning rubber, plastic, glass and other molds without damaging the surface of the mold, ensuring the precision of the mold, improving the product grade, and increasing the service life of the mold.

Polishing processing, remove scratches and processing marks on parts, and obtain a uniform non-reflective surface effect.

Get special sandblasting effects, such as sandblasting lettering (painting), sandwashing jeans, frosted glass, etc.

02 Frosting

The frosting treatment in chemistry is to mechanically or manually grind the glass with corundum, silica sand, pomegranate powder and other abrasives to make a uniform and rough surface. It can also be used to process the surface of glass and other objects with hydrofluoric acid solution. Products become frosted glass and other products. The sealing performance is better after frosting treatment.

Frosted glass:

It refers to the process of changing the original smooth surface of ordinary glass from smooth to rough (transparent to opaque) through object treatment. One or both sides of the flat glass are mechanically or manually ground with corundum, silica sand, pomegranate powder and other abrasives to make a uniform and rough surface. The glass surface can also be processed with hydrofluoric acid solution, and the obtained product is frosted. Glass. The surface of frosted glass is processed into a rough matte surface, which diffuses the incoming light and has the advantage of being transparent and opaque.

03 Difference between sandblasting and frosting

Both frosting and sandblasting are used to haze the surface of the glass, so that the light will form a relatively uniform scattering after passing through the lampshade. It is difficult for ordinary users to distinguish between the two processes. The following describes the production methods of the two processes and how to identify them.

Frosting process:

Frosting refers to immersing the glass in a prepared acidic liquid (or applying an acidic paste) to erode the glass surface with strong acid, and at the same time, ammonia hydrogen fluoride in the strong acid solution makes the glass surface form crystals. Therefore, if the frosting process is done well, the surface of the frosted glass is extremely smooth, and the crystals form scattering to produce a hazy effect. If the surface is relatively rough, it means that the acid has seriously eroded the glass, which is a manifestation of the immature craftsmanship of the frosting master. Or some parts still have no crystals (commonly known as not being ground to the sand, or the glass has mottled spots), which also belongs to the poor control of the master's craftsmanship. This process is technically difficult. The process is best manifested as glistening crystals appearing on the surface of the glass, which are formed under a critical condition, mainly because the ammonium hydrogen fluoride has reached the point where it is almost used up.

Sand blasting process:

This process is very common. It hits the glass surface with sand particles ejected at high speed from a spray gun, so that the glass forms a fine concave-convex surface, so as to achieve the effect of scattering light and make the light appear hazy when it passes through. The surface of glass products with sandblasting process is relatively rough. Because the glass surface is damaged, the originally transparent glass seems to be white glass in the light. The difficulty of the process is average.

Frosted glass is produced with a sandy feel and strong texture, but the pattern is limited; sandblasted glass is first carved with paper according to the requirements and then sprayed out the pattern. In this way, you can engrave any graphics you want. Frosted than sandblasted the surface grain size should be finer.

The two processes are completely different processes. The cost of frosted glass is higher than that of sandblasted glass, and the effect mainly depends on the needs of users. Some unique glasses are not suitable for frosting. From the perspective of pursuing nobility, frosting should be used. The sandblasting process can be completed in general factories, but it is not easy to do a good frosting process.