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Glass has been used for thousands of years. This material was discovered by our ancestors when it was found that a lightning strike or hot, volcanic lava melted quartz sand. Over the years, humankind has built on nature’s revelation, and the production of glass has grown and grown. Stoelzle are globally renowned specialists in this field, and with over 200 years experience, our passion and excitement remains. We welcome you to enter our world and learn more about this fascinating process.
At Stoelzle, we produce type II glass (treated soda lime glass) and type III glass (soda lime glass). These are, indeed, the most popular types of glass used industrially. The raw materials applied in the process are:
The sand is the main component, limestone provides stability and soda lowers the melting point. As we work towards becoming more sustainable, we also use recycled cullet to help save on the use of raw materials and energy. After the raw materials have been precisely weighed, they are carefully mixed together. Subsequently, the collection of raw materials, which is also referred to as batch, is ready for melting.
The melting process can be divided into three main steps:
The forming process begins in the feeder. Here, gobs of glass are cut off, which are then formed into the required shape using the IS machine. Using the blow-blow or press-blow process the machine works very quickly to configure the viscous liquid into finished products. The formed glass containers and bottles are then transported on a conveyor belt for cooling.
The term ‘blown glass’ denotes moulded glass, where gobs of heated glass are directed into a moulding machine. From here the material enters the cavities, where air supply forms the neck and the general shape of the future container. The temporary shape is called ‘parison’ and refers to the unshaped mass of glass right before it is moulded into its final form. In order to create the final glass bottle or jar, one of these two processes can be applied:
Annealing describes the process in which the glass containers are cooled down after the moulding process. This is achieved in a heated furnace called “Lehr”, where the glass is slowly cooled down to avoid breakage or damages. The temperatures of this cooling area are between 590 °C and 450 °C.
During the cooling process, the outer surface of the glass products is treated with a coating which serves as a surface refinement and a protective layer.
At Stoelzle, we care about everything we produce and quality is a top priority. For this reason, our glass products go through an extensive inspection process after leaving the Lehr. Numerous automated inspection machines are in place where all containers are checked for defects and rectified if necessary.
We are proud to offer our customers an extensive range of products boasting a plethora of uses. Our vast array includes pharmaceutical packaging, cosmetic glass packaging and tableware as well as glass packaging for food, beverages and prestige spirits.
Glass, by its very nature, is a fragile material, which makes packing our products all the more important. To ensure our products reach our clients in exceptional condition, we diligently pack them so we can be confident that the containers and bottles are absolutely safe for transport. We are proud of our responsible packaging and remain flexible to the needs and wishes of our customers. From large and small trays to shrink packaging, rental boards, cardboard or plastic layers to Euro or industrial boards. We source the perfect solution.
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