Converting and Reshaping

SCHOTT applies more than 130 years of experience and expertise to the techniques of converting and reshaping, which has led to a vast array of industry-leading products with outstanding technical properties that meet the most demanding requirements.

What is converting and reshaping?

Glass and glass-ceramic products such as sheets, tubes and rods are made by direct molding from hot molten glass. When a customer has special requirements, glass can be reheated and fed to a downstream forming process. This is called converting or further processing.

SCHOTT has been developing this expertise over many decades to serve a single purpose: to produce glass products with the exact properties and dimensions for our customers’ needs. Whether it is a simple 90-degree bend in a glass-ceramic fire viewing panel or millions of pharmaceutical vials for a global vaccination project, we offer a combination of the highest quality materials, the latest processing equipment, and in-depth knowledge of the glass material.

Two bent and one straight glass tube with copper conductive tape for pneumatic conveying systems

The process of bending

Bending is a highly accurate reshaping process in which glass is heated in a concentrated area before being bent and tempered to create glass products in pre-defined shapes. SCHOTT offers a range of methods to achieve different bends, including high-precision angular bends, curved shaping, and specialist tube bending.

Vial being created from glass tubes using the converting process

High-precision converting

Converting is a state-of-the-art technique for manufacturing glass containers. For instance, SCHOTT processes pharma tubes in high-precision glass containers with optimized container geometry for improved strength. Another converting technology results in a more homogenous inner surface that reduces the risk of delamination and achieves a superior E&L profile.

Types of converting and reshaping

1. Converting for pharmaceutical packaging
Glass tubing is processed into a variety of pharmaceutical containers with a range of key properties, such as high strength and chemical resistance, as well as tight tolerances.

2. Further processing of glass tubes and rods
Creating a variety of uniform shapes with strong mechanical and chemical properties, glass tubing is evenly heated for further processing.

3. Bending of glass and glass-ceramic sheets
Flat sheets can be formed in different ways – for example, curved or angular bent forms with different radii.

4. Bending of glass tubes
Glass tubes and rods can be bent by heating them evenly before shaping, creating products with a wide range of specifications and attributes.

5. Glass pressing
Pressed blanks are shaped into high quality optical glasses like lenses or prisms using hot processing under pressure. 
Five curved and angular bent transparent SCHOTT ROBAX® glass-ceramic panels for fireplaces and stoves

Converting and reshaping methods

The incredible versatility of glass and glass-ceramics, and their ability to be bent, shaped, and converted, not only provides our customers with products of the exact dimensions and shapes for their application, but delivers long-lasting high performance in a number of ways.
Converting for pharmaceutical packaging
Converting for pharmaceutical packaging

SCHOTT’s high-quality glass tubing can be converted into a range of unique pharmaceutical containers. The containers not only feature high strength and chemical resistance but also offer exceptionally tight tolerances and consistent performance. 

Our pharmaceutical packaging portfolio has a global reputation for the secure storage of sensitive drugs, as well as exceptional strength and a wide range of products. Our in-depth knowledge of converting processes has resulted in several key industry innovations. 

For example, EVERIC™ strong vials offer increased strength in side compression and axial load, while EVERIC™ pure vials feature improved bottom forming that results in a reduced risk of delamination. Our converting expertise is also applied to prefilled syringes, which exhibit an excellent E&L profile for the protection of highly sensitive drugs. 

YOUR ADVANTAGES

  • Improved container (vial) strength.
  • Ideal for low-fill, highly sensitive drugs.
  • Conform to all major international standards for pharmaceutical packaging.
Further processing of glass tubes and rods
Further processing of glass tubes and rods

SCHOTT products created by the further processing of glass tubes or rods achieve highly impressive technical properties across a wide variety of shapes, sizes, and forms. This makes them suitable for many demanding and specialist applications. 

DURAN® glass tubes and rods are formed into the desired shape by careful manipulation of concentrated areas at very high temperatures. The glass tube is fixed and evenly heated from all sides through a continuous turning process, before further processing, such as being treated with specialist tools for reshaping or joining. Products created by this process include Y-pieces, T-pieces, spirals, and complex manifolds, to name a few.

YOUR ADVANTAGES

  • Facilitates highly versatile shaping and customization.
  • Wide range of geometries possible.
  • CTE remains after converting process.

 

DURAN® is a registered trademark of DWK Life Sciences GmbH.

Bending of flat glass and glass-ceramic sheets
Bending of flat glass and glass-ceramic sheets

SCHOTT utilizes a number of glass bending processes to carefully shape glass and glass-ceramic plates to create innovative, attractive, and robust products for demanding applications and environments.

The bending processes require high and specifically adjusted temperatures. Once a glass plate has been heated to the required level, it is shaped using a press/bending procedure or sagging process to achieve the requested form. A range of different techniques can be applied to tailor this process to the required application.

YOUR ADVANTAGES

  • Suitable for a wide range of sheet or panel sizes.
  • Variation of multiple bending radii possible.
  • Competitive advantages though highly customized products.
Bending of glass tubes
Bending of glass tubes

As the world’s leading manufacturer of glass tubing, SCHOTT offers a wide range of high-end products created using bending technology.

One example is DURAN® borosilicate glass tubing with high-precision bends for pneumatic conveying systems. This offers an effective solution for the transportation of abrasive and corrosive materials, which deteriorates much less rapidly than its stainless steel alternatives. In the automated bending process, heat is applied to a defined area to curve the glass tubing to a pre-determined radius. After the forming process, copper conductive tape is applied.

For bending glass tubes, a manual forming process is also possible. As DURAN® enables optimum light input for bio-secure algae cultivation, the same glass tubing is ideal for the U-bends and J-bends used in photobioreactor systems.

YOUR ADVANTAGES

  • Precise tolerances for easy installation.
  • Wide range of possible geometries.
  • Mechanically durable and long-lasting performance.
  • CTE remains after converting process.

 

DURAN® is a registered trademark of DWK Life Sciences GmbH.

Glass pressing
Glass pressing

Along with the more common hot processing methods, SCHOTT manufactures a range of customized glass products using carefully modified techniques. One of these techniques is pressing, which is suitable for high volume production of precise optics.  

Pressing begins with the production of a two-part mold, which meets high standards for precision, surface quality and wear resistance. The cavity of this mold is then filled with a round or square glass disc, before being heated. After heating, the glass can be pressed by the mold to the required shape, then cooled to create the final product.

YOUR ADVANTAGES

  • Pressing allows for customization while optical properties are maintained.
  • Offers less processing time and more cost savings for the customer.
  • Glass can be taken directly from the melt (primary forming) or be present in a solid state and reheated (forming).
  • Offers a wide range of unconventional geometries.

Black and white image of man in black top with blue rectangles
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Want to know more? Let's talk

If you need more information about any of our Hot Processing techniques or would like to talk to us about a specific project, please get in touch.

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