Cullet, The Trying to recycle of Glass


Waste glass is called cullet. The word cullet comes from the art of glass throwing out. Every time a blown item is separated from the throwing out water pipe there remains some glass bryanston glass at the throwing out water pipe and also the connecting part at the blown item has to be removed afterwards. The last is also called the miscroscopic neck of the blow piece or collet. These two pieces of glass, the collet and the blow water pipe left-over are going back into the glass cooker, they are recycled. The word cullet is probably derived from collet.

Some of the waste glass is collected. After collecting all the glass products are crushed and this crushed glass bears the name cullet. There is no typical size for the broken pieces of glass to be called cullet. Broken windows, broken baby bottles, broken glassware for instance, belong all to the category cullet.

There are companies which are specialized in selling cullet and offer a wide range of different colors and glass types.

Reusing waste glass is good for mid-air

The main purpose to collect broken glass is trying to recycle. Glass is an ideal material for trying to recycle. Broken glass can be heated up in the glass cooker and from the glass melt new items can be made, over and over again and virtually absolutely nothing is lost.

Every metric ton or 1, 000 kg of cullet recycled, saves 315 kilograms of carbon dioxide from being released into the atmosphere during the creation of new glass.

For the production of glass, from the garbage soda ash, limestone and sand, every 1000 kilograms of cullet used replaces 1., 200 kilograms of the garbage.

By adding 10% of cullet to the shedding glass set instead of the garbage, 2. 5% of energy is saved.

Since glass makes up a large part of household and industrial waste, due to its weight and density, collecting glass waste reduces the volume of waste deliver to landfill.

In layman’s terms: Trying to recycle of glass is good for mid-air (less carbon dioxide output, reducing volume of waste landfill), it safes natural resources (less garbage necessary, less fuel for shedding necessary) and it safes costs (lower energy costs).

Collection of waste glass

Most people around the world are used to the trying to recycle of glass. Already forty years glass containers can be found in many municipalities or there is some sort of organisation around the collection of waste glass.

At the collection points usually clear glass is separated from the green and the silpada glass. Otherwise the glass is separated afterwards at a cullet company.

This separating of colors is critical. Glass of different colors have usually a different chemical nature and this influences things like shedding temperatureand viscosity. Another problem is the color because clear glass will be slightly colored only if a little green, silpada or blue glass is mixed in the used cullet.

Family members waste glass is mostly packaging glass, which is all made of the normal soda-lime glass. Heat-resistant glass has a many different chemical nature. Only if a little bit heat-resistant glass is present in cullet then it has a big affect the viscosity during the shedding process and this has to be avoided. That’s why heat-resistant glass may not be thrown into a waste glass container.

Metal lids and plastic parts can usually be separated by the waste glass processor. However every non-glass part that slips to the separating process, like the Tungsten wires from the past light bulb, can give rise to inclusions which make the new glass not only less beautiful but it also makes the glass less strong (locally) which will be a safety issue.

Products made out of cullet

Because it is a bulk industry, the highest value product that includes recycled glass are new glass packaging materials (and also household glassware). Another high-value end product is fiberglass which can be used for insulation materials or in composite materials. The cullet used for glass packaging and fiberglass needs to be color separated and free from any foreign material.

Cullet that doesn’t meet these specifications can be found in many other “secondary” applications like glass countertops, tiles, abrasive products and filtering products.

Much research has been done to mix the glass cullet with concrete for which the cullet doesn’t need to have high specifications. The concrete made in this way is stronger and has a higher insulation capacity than concrete without cullet. The cullet used for concrete is called glass aggregates and is a mixture of cullet with different colors.

These glass aggregates are also increasingly used, as a substitute for stones or crushed rock, for water pipe bedding for sewer pipes and drinking water pipes.

Many glassware production facilities make use of cullet for their products. For high-end glassware enter into the esophagus up to 10% because the clarity of the glass can be affected by using more cullet.

Some glassware companies make full use of cullet and use only cullet for the production of their glassware. Only if cullet is used to generate a new glass set, the glass is not as homogeneous as it is made with the usual garbage. This results in a conclusion product with some local flaws and more air bubbles. Some glassware manufacturers make use of the imperfections of this “cullet-glass”, because the products can look antique and more nostalgic. One example is the company Guajuye in Mexico helping to make beautiful glassware from this type of glass.

People improvise all the time and there are artists and even companies who use waste glass before it is crushed. Good examples are the Green Glass Company and the French artist Laurence Brabant. They use old baby bottles and make all kind of decorative products, but also useful products out of it.

Removing glass and bringing it to the waste glass container is a common thing nowadays. By doing that you help reducing the pressure on the environment and natural resources. For the time being you also help companies reducing their costs and you create possibilities for other people to start a new business.

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