During the coating process, it is crucial to ensure that the coating is uniform and completely covers the surface of the wax paper, which directly affects the final quality and performance of the wax paper. The following are the key steps and precautions to achieve this goal, summarized in combination with the relevant information in the reference article:
Coating preparation
Coating formula: Accurately prepare the coating, including the proportion of wax materials (such as beeswax, paraffin, etc.), resins (such as polyurethane, etc.), dyes, glycerin and other additives. Adjust the formula according to product requirements to ensure that the coating has good fluidity, adhesion and uniformity.
Preheating and stirring: Before coating, preheat the coating to reduce its viscosity and improve fluidity. At the same time, ensure that the components in the coating are evenly mixed by sufficient stirring to avoid precipitation or stratification.
Coating equipment adjustment
Equipment selection: Select appropriate coating equipment according to the characteristics of the coating and production needs, such as extrusion coater, blade coater, etc. Ensure that the equipment is in good condition and the coating accuracy and stability meet the requirements.
Parameter setting: Adjust various parameters of the coating equipment, such as coating speed, coating amount (adjusted by the gap between rollers and pressure), coating temperature, etc. The setting of these parameters will directly affect the uniformity and coverage of the coating.
Coating operation
Paper pretreatment: Before coating, pre-treat the wax paper, such as cleaning the surface, removing static electricity, etc., to ensure that the coating can be smoothly attached and evenly distributed.
Uniform coating: Start the coating equipment and evenly coat the coating on the surface of the wax paper. During the extrusion coating process, two or more extrusion rollers are used to apply the coating to the wax paper, and the coating amount is adjusted by controlling the gap between the rollers and the pressure. Ensure that the coating is evenly distributed on the entire surface of the wax paper without missing coating or bubbles.
Real-time monitoring: During the coating process, the coating effect is monitored in real time by visual inspection or with the help of online detection equipment. Once unevenness or abnormality is found, immediately adjust the equipment parameters or stop coating for processing.
Subsequent processing
Drying and curing: After coating, the wax paper is sent to the drying equipment for drying and curing. By controlling the drying temperature and time, the coating forms a uniform and firm coating on the surface of the wax paper.
Quality inspection: After drying and curing, the wax paper is inspected for quality, including indicators such as coating uniformity, adhesion, and waterproof and oil-proof performance. Ensure that the wax paper meets product standards and customer needs.
Ensuring that the coating is uniform and fully covers the wax paper surface requires multiple aspects such as coating preparation, coating equipment adjustment, coating operation and subsequent processing. High-quality coating effects can be achieved by accurately controlling various parameters and strictly implementing operating specifications.