Painting ceramic porcelain plates in a factory involves a special process to make sure they are durable, safe for food, and look good. Here’s a simple guide:

 

 Surface Preparation

First, the plates are cleaned to remove dirt, dust, or oils. This step is important to help the paint stick. Usually, the plates are washed with water and mild soap, rinsed well, and then dried completely.

 

 Priming

Next, a primer is applied to the porcelain plate. The primer helps the paint stick better and last longer. It creates a smooth base for painting. The primer can be sprayed on with machines or applied by skilled workers.

glazing-color

Paint Application

Once the primer is dry, the porcelain plate are ready to be painted. Special ceramic paints that are safe for food and can withstand heat are used. These paints come in many colors and finishes. The paint is applied using spray guns, stencils, or other methods. Several coats may be used to get the right color and coverage.

 

 Drying/Curing

After painting, the plates are dried or cured to set the paint. This might involve air drying or baking the plates in ovens at high temperatures. This process makes the paint more resistant to chipping, scratching, and fading.

 

 Quality Control

Throughout the painting process, quality control checks are done. This ensures the plates have the right color, coverage, and finish. Inspections, color matching tests, and adhesion tests are done to spot any defects.

 

 Finishing

After the paint is dry, any extra finishing touches are added. This could include decorative accents, a clear protective coat, or other design elements to improve the look and durability of the plates.

 

 Firing

Firing the plates in a kiln is an important step to make them durable and safe for use. Here’s how it works:

 

homey ceramic factory-klin

  1. Loading the Kiln: The painted plates are placed on shelves in the kiln with enough space between them for proper airflow.
  2. Firing Schedule: The temperature and duration depend on the clay type and desired finish. Plates are typically fired at temperatures between 1800°F and 2200°F (982°C to 1204°C).
  3. Preheating: The kiln may preheat to remove any moisture from the plates, preventing cracks.
  4. Ramping Up: The temperature is gradually increased to avoid thermal shock.
  5. Soaking: Plates are held at the target temperature to ensure they are fully vitrified, making them dense and less porous.
  6. Cooling Down: The kiln cools down slowly to prevent thermal stress.
  7. Unloading: Once cool, the plates are carefully removed from the kiln.
  8. Quality Inspection: The fired plates are inspected for durability and finish. Any defects are noted and may require re-firing.

 

 Testing

Before shipping, the plates are tested to ensure they meet food safety standards. Tests check for harmful substances like lead and assess the plates’ durability against heat, moisture, and mechanical stress.

 

 Packaging

Finally, the plates are inspected, packaged, and prepared for shipment. Special care is taken to protect them during transit so they arrive in perfect condition.

 

By following these steps and maintaining strict quality control, factories can produce high-quality painted porcelain plates that are safe, durable, and attractive.