Tableware troubleshooting

How can I resolve defects in my tableware production?

Manufacturing high-quality tableware requires precise control over every stage, from body preparation to final firing. At Imerys, we provide technical support to address the most common challenges the industry encounters.

Why am I finding residue on my sieves during body preparation?

Measuring the quantity and type of residue after milling or blunging is a critical step in tableware production. If an optical microscope or magnetic bar reveals magnetic, colored, or unusual particles, there is a high risk of defects appearing later in the process.

• The solution: Our experts help you test and measure sieve residue to solve these issues before they impact your final products.

In my tableware production, how do I prevent casting spots and cords?

During casting, particles can orient themselves as the mold fills, leading to segregation and resulting in spots or cords after firing.

• The solution: Adjusting the rheological setup of the slurry is the best way to control these defects. Increasing suspension density or thixotropy reduces particle segregation.
• Recommended materials: Use kaolins like our Grolleg grade or our ball clays (Hywite Superb or FMT) to improve density and control thixotropy.

What can be done about drying cracks and product loss?

In tableware, drying cracks often stem from the shaping stage, uneven atmosphere (temperature/moisture), or fast drying.

• The solution: Using minerals promotes better particle packing, which absorbs or prevents crack generation and improves yield.
• Strength improvement: Finer and stronger kaolins such as Grolleg, Standard Porcelain, KaoPearl CNL30 or Premium can be used to increase body strength.