Common Defects and Countermeasures of
Enamel Cookware Decal Firing
With the development of enamel technology, the industry has higher and higher requirements for the appearance of daily-use enamel. Enamel decals are a kind of enamel decoration technology, which are widely used in enamel cups, enamel spittoons, enamel hot pots and other products. This article sorts out some common defects and solutions for daily-use enamel decals and burnt decals, which is convenient for enamel manufacturers to refer to.
① Popping decals: the decal surface bursts after firing.
Possible reasons: 1. The quality of the decal sticker is poor; 2. The film is not scraped and there is gas left when the decal is applied; 3. It is not dry.
Ways to overcome: 1. Improve the quality of the decal paper; 2. The decal paper must be attached to the product; 3. It must be dried before it can be fired.
② Matte: the color glaze is dull after burning
Possible reasons: 1. The quality of the decal paper is poor; 2. The burning temperature is low and the firing time is not suitable; 3. The atmosphere in the furnace is improper.
Overcoming methods: 1. Improve the quality of the decal paper; 2. Adjust the degree and time according to the process; 3. Make enough air in the furnace.
③ The color of the decal is not correct: the pattern loses its original color.
Possible reasons: 1. The quality of the decal paper is poor; 2. There is a reducing atmosphere in the furnace.
Overcoming methods: 1. Improve the quality of the decal paper; 2. The preheating zone is lengthened during firing, which is beneficial to the oxidation of organic matter.
④ Boiling: A boiling point is generated on the pattern
Possible reason: there is organic matter in the paste
Overcoming methods: 1. The product should be clean; 2. The soaking time of decal paper should be sufficient.
⑤ Paper frame printing: there are paper traces on the product
1. The water is not clean when removing the film; 2. The quality of the decal paper is poor.
2. The water should be clean; 2. Improve the quality of decal paper
⑥ Improper decals: Improper placement of patterns and products
The decal paper is not pasted right, stick it according to the required position.