The purpose of glass edging

The purpose of glass edging

1. Grind off the sharp edges and corners caused by cutting to prevent injury during use.
2. The small cracks and micro cracks formed by cutting on the edge of the glass are abraded to eliminate local stress concentration and increase the strength of the glass.
3. The geometric shape and dimensional tolerances of the glass after edging meet the requirements.
4. Perform different grades of quality processing on the edge of the glass, namely rough edging, fine edging and polishing.
5. The need for glass assembly

Summary: Use safety, product safety, product appearance grade needs, product assembly needs.

HOW IS GLASS MADE: 6 STEP-BY-STEP PROCESS

HOW IS GLASS MADE

1. Melting and Refining-HOW IS GLASS MADE

In order to make clear glass, the right set of raw materials is required. This consists of silica sand (SiO2), sodium oxide (Na2O) from soda ash, calcium oxide (CaO) from limestone/dolomite, dolomite (MgO), and feldspar (Al2O3). These ingredients are mixed in the right proportion, and the entire batch is flown into a furnace heated to 1500 degree Celsius.

In order to impart colour to the glass, certain metal oxides are also mixed in the batch.

2. Float bath-HOW IS GLASS MADE

The molten material from the furnace flows into the float bath which consists of a mirror-like surface made from molten tin. This material enters the bath at 1500 degree Celsius and leaves the bath at around 650 degree Celsius. Its shape at the exit is like a solid ribbon.

3. Coating for reflective glass-HOW IS GLASS MADE

Thereafter, if one is producing reflective glass surfaces that help in keeping indoors cooler, then coating procedures are followed in which either a hard coat or a soft coat is applied on the surface of the cooled ribbon at high temperatures.

4. Annealing-HOW IS GLASS MADE

Next, in order to remove the internal stresses built up in glass, a process called annealing is done. This process allows the glass ribbon to pass through a layer which eliminates any stresses on the glass surface and gradually cools it to give it its final hardened form. This makes it easier to cut the glass and shape it accordingly.

5. Inspecting-HOW IS GLASS MADE

Through acute and advanced inspection technology, more than a 100 million inspections can be made throughout the glass manufacturing procedure to identify air bubbles, stresses or grains of sand that refuse to melt. This is essential in quality-proofing the final form of glass.

6. Cutting to order-HOW IS GLASS MADE

Finally, diamond steels are used to trim and cut the glass ribbons into square shapes.

Glasstec 2020 postponed until June 2021

Glasstec 2020 postponed

Glasstec 2020 postponed until June next year.

The new dates of the Düsseldorf, Germany-based trade show is June 15 to 18, 2021.

Organiser Messe Düsseldorf said “In view of the continued uncertainties in terms of travel restrictions and quarantine provisions in the core target markets, Messe Düsseldorf has opted in favour of these new dates in close coordination with the trade fair’s advisory board and all partners involved.”

It added that it is cooperating with associations to offer digital service formats for 2020 with the aim of bringing customers and exhibitors together and digitally on the original trade fair dates in October.

Egbert Wenninger, Chairman of the glasstec advisory board and Chairman of VDMA’s Glass Technology Forum, said: “The economic crisis caused by the Corona pandemic has also hit the glass industry and its machinery and equipment manufacturers hard.

Many companies are forced to switch to crisis mode and put all investments – including trade fair participations – to the test to mitigate possible negative economic impacts.

Glasstec 2020 postponed to June 15 to 18, 2021.

“Potential travel restrictions and the protection of visitors’ and exhibitors’ health will have an impact on visitor numbers. A smaller glasstec 2020 with markedly fewer visitors would in our view not do justice to the trade fair.

“glasstec has been and will be the most important global event for the glass industry, mechanical engineering and skilled crafts; and since it should continue to be that way we decided to postpone.

“In 2021 we expect a strong glasstec with high international attendance, ideally in perfect sync with a phase of economic recovery after Corona.”

Glasstec 2020 postponed to June 15 to 18, 2021.

Glass deep processing types

glass deep processing

Glass deep processing is mainly divided into the following categories

1. Tempered glass-Glass deep processing

The more commonly used glass deep-processing product is tempered glass. Whether it is a windshield or window glass for vehicles such as cars and trains, or a glass gate and partition for high-end hotels, tempered glass is used for glass tabletops and many glass curtain walls. This is because the strength of the tempered glass is 3 to 5 times that of the flat glass, and the resistance to quenching and heating is also better. And it is in the form of small particles after crushing, which will not cause great harm to people, so it is called safety glass.

The production of tempered glass is very simple. After cutting, chamfering, edging, polishing or punching, flat glass is cut into 650 ℃ The above tempering furnace is heated. And then quenched with cold wind to form a permanent compressive stress on the glass surface, which greatly improves the strength. This is tempered glass. Once the tempered glass is made, it cannot be cut and processed, otherwise it will be crushed.

2. Laminated glass-Glass deep processing

Another type of safety glass is laminated glass. Its structure is like a “sandwich”, with transparent organic materials in the middle of the two layers of glass, firmly sticking the glass together. Therefore, even if the laminated glass is broken, there will be no debris splashing and hurting people. And the transparent interlayer film has good strength and toughness, and plays a good safety role. For example, in the event of a severe collision, the laminated windshield of the car can prevent the driver and passengers from being thrown from the windshield. And the soft organic material can also reduce the impact of the head of the person. In addition, increasing the thickness and the number of layers of glass can make laminated glass have bulletproof, explosion-proof and anti-theft performance. And become a special glass for special windows. Of course, because the laminated glass also has a good sound insulation effect, effectively reduce noise (generally can reduce the noise 35 ~ 40 dB). So it is widely used in airport offices, waiting halls and other occasions that require sound insulation.

In the middle of the two pieces of glass, the isolation cabinet made of aluminum, and then glue them together. Forming a gap of 6 mm or 12 mm between the two pieces of glass, this is hollow glass. The insulating property of insulating glass is very good. The insulating property of 12 mm thick insulating glass is comparable to that of 100 mm thick concrete walls. Therefore, the glass curtain wall of the building and the relatively large glass windows should use hollow glass in order to reduce heating energy consumption.

Insulating glass also has good sound insulation. In addition to the use of flat glass as the original sheet for the manufacture of insulating glass, tempered glass, laminated glass, heat-reflective coating glass, heat-absorbing glass, etc. They can also be used as the original sheet to make advanced insulating glass with multiple functions for super high-rise buildings. The important parts such as the tourist office of things. In addition, the train’s air-conditioned cars and subway window glass are tempered hollow glass to improve thermal insulation, sound insulation and other properties.

3. Coated glass-Glass deep processing

Coated glass is also called reflective glass. Coated glass refers to coating one or more layers of metal, alloy or metal compound films on the glass surface to change the optical properties of the glass to meet certain specific requirements. According to different characteristics of products, coated glass can be divided into the following categories: heat reflective glass, low-e glass, Low-E, conductive film glass, etc.

How to choose glass polishing powder

How to choose glass polishing powder

How to choose glass polishing powder. The following are 5 factors.

1. How to choose glass polishing powder-The particle size of the powder

It determines the polishing precision and speed, how many meshes and the average particle size of the powder are commonly used. The mesh size of the sieve can grasp the value of the relative particle size of the powder, and the average particle size determines the overall level of the particle size of the polishing powder.

2. How to choose glass polishing powder-Mohs hardness of powder

powder with relatively high hardness has a faster cutting effect, and the addition of some grinding aids, etc. can also improve the cutting effect; different application fields will vary greatly, including its own processing technology .

3. How to choose glass polishing powder-Suspension of powder

Good powder requires that the glass polishing powder has better suspendability. The shape and particle size of the powder have a certain influence on the suspension performance. It ’s better, but not definitive. The improvement of polishing powder suspension performance can also be improved by adding suspension (agent).

4. How to choose glass polishing powder-The crystal form of the powder

The crystal form of the powder is a single crystal particle agglomerated together, which determines the machinability, wear resistance and fluidity of the powder. The single crystal particles that are agglomerated with powder are separated (broken) during the polishing process, so that their machinability and wear resistance are gradually reduced. .

5. How to choose glass polishing powder-Appearance color

The content of Pr in the raw material is related to the burning temperature and other factors. The higher the content of praseodymium, the powder is brownish red. The low-cerium polishing powder contains a large amount of praseodymium (cerium praseodymium material), which makes it appear reddish brown. High cerium polishing powder, the higher the burning temperature, it appears white pink, the temperature is low (about 900 degrees), it appears light yellow.

Requirements of precision optical glass polishing powder

optical glass polishing powder

1.Basic requirements of optical glass polishing powder

High-precision optical glass is commonly used to make invisible radar search mirrors, reconnaissance satellite camera lenses, high-speed aircraft windows, and optical lenses and prisms in laser launchers. Application, the requirements for cerium oxide polishing powder in optical glass polishing are also very high. The following summarizes the basic requirements of optical glass polishing powder
(1) The fine powder has fine and uniform particle size, within the allowable range.
(2) It has high purity and no other mechanical impurities.
(3) has very good dispersibility to ensure high efficiency and uniformity in the processing process, and can be appropriately added with a dispersant to increase the suspension rate.
(4) The fine powder particles need to have a certain lattice shape. And form sharp edges and corners when broken to improve the polishing efficiency.
(5) With proper density and hardness, it has good wettability and suspendability with water. And the polishing powder needs to be mixed with water

2.Grinding Force – optical glass polishing powder

The larger the polishing powder, the greater the grinding force. And the more suitable for harder materials. It should be noted that all polishing powders have a distribution problem. The average particle size or median diameter D50 is only Determines the speed of the polishing speed, and the maximum particle size Dmax determines the level of polishing accuracy. Therefore, in order to obtain high precision requirements, it is necessary to control the maximum particle size of the polishing powder.
The true hardness of cerium oxide polishing powder is related to the material. Because the firing temperature is different. The strength of the agglomerates is different. So there will be a feeling of different hardness when used. And the grinding rate and wear resistance of the product will be different. This production plant, which requires experience, is controlled by throwing different substances. The concentration of the slurry in the polishing process determines the polishing speed. The higher the concentration, the higher the polishing speed. When using small particles of polishing powder, the slurry concentration should be adjusted properly to obtain proper fluidity. It is generally recommended to be 7-10%.

Method for grinding and polishing glass of mobile phone touch screen

The grinding of mobile phone touch screen glass is divided into rough grinding and fine grinding, and fine polishing.

Rough grinding of mobile phone touch screen glass: Abrasives with relatively large particle size are used to grind the glass surface or the surface of the product rough or uneven or the remaining part of the glass during forming to remove most of the blank. To rough geometry and roughness;

Fine grinding of mobile phone touch screen glass: Fine grinding occurs on the basis of rough grinding and is another step for polishing.The result achieved is exactly the opposite of fine grinding, and the result is that it can maintain more accurate geometry and fine crack depth. ;

Polishing of mobile phone touch screen glass: polishing is a process and part of the realization of the optical surface layer.On the premise that the first two must be prepared for the next step of polishing, so that in the entire polishing process, try to remove fine grinding and rough grinding The remaining ring-breaking layer realizes the ideal effect of the optical surface.

Rare earth heavyweight policy is expected to be intensive

Two days, three meetings!

From June 4th to 5th, the National Development and Reform Commission held three meetings on the issue of rare earth industry. The conference targets are industry experts, rare earth enterprises and competent authorities of production areas. The main issues involved are rare earth environmental protection, rare earth black industrial chain, rare earth intensification and high-end development. For an industry, such intensive actions and attitudes are rare.

The industry believes that the rare earth industry will have further policy promotion, a series of policies such as environmental inspection, indicator verification and strategic storage will be released intensively, promoting the rationalization of the rare earth industry structure, advanced technology, effective resource protection, and orderly production and operation. The development pattern of the industry will give full play to the special value of rare earth as a strategic resource.

Environmental protection will become an important grip

On January 4, 2019, the Ministry of Industry and Information Technology and other 12 ministries and commissions issued the “Notice on Continuously Strengthening the Order Rectification of the Rare Earth Industry.” For the first time, a multi-sector joint supervision mechanism was established, and a special supervision was conducted once a year to hold accountable for violations of laws and regulations. This means that the rectification of rare earths has officially entered a normal state.

At the same time, the “Notice” will further implement the requirements of the rare earth group and intermediary organizations, how to guide the high-quality development of the industry, and will have a profound impact on the sustainable and healthy development of the rare earth industry.

According to industry insiders, the rare earth industry is a heavily polluting industry that causes serious soil erosion, damage to surface plants, soil pollution, acidification and other environmental problems during mining and processing. Since 2017, environmental protection supervision has been implemented, and many rare earth enterprises that fail to meet environmental standards have been shut down and punished. This has shocked the industry and promoted the price increase of rare earths. Therefore, environmental inspection will be an important means for the country to rectify rare earths.

Rare earth new policy is on the way

Meng Min, spokesman of the National Development and Reform Commission, said that at present, the NDRC is working with relevant departments on the relevant opinions and suggestions collected at the three symposiums, and will conduct research on the basis of in-depth research and scientific arguments. Relevant policy measures to effectively play the special value of rare earth as a strategic resource. For example, in view of the current illegal production of rare earth industry, the industry will step up efforts to rectify the norms, build a long-term regulatory mechanism, and regulate the development order of the industry. In response to the problem of the history of environmental protection and environmental protection in the rare earth industry, the ecological restoration and environmental management of the mine will be promoted.

Tempered glass and ordinary glass

Tempered glass is obtained by first cutting an ordinary annealed glass into a desired size, then heating it to a near softening point, and then performing rapid and uniform cooling. After tempering, the surface of the glass forms a uniform compressive stress, while the inside forms a tensile stress, which greatly improves the performance of the glass. The tensile strength is more than three times that of the latter, and the impact resistance is more than five times that of the latter.

Since the tempered glass is broken, the fragments are broken into uniform small particles and there is no common glass blade-like sharp corner, which is called safety glass and is widely used in automobiles and interior decoration.

In the home, the sharp knives and sharp corners of the ordinary glass are easy to cut children or impacters, causing personal injury. After the glass is broken, it becomes a small particle or a knife. This is the main difference between tempered glass and ordinary glass.

Due to the stress on the surface of the tempered glass, this characteristic is also an important sign to identify true and false tempered glass. That is, the tempered glass can see the colored stripes on the edge of the glass through the polarizing plate, and the surface of the glass. When you look at the layers, you can see black and white spots. Polarizers can be found in camera lenses or glasses, and attention is paid to the adjustment of the light source during viewing, which makes it easier to observe.