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What are the Drying Methods of PVC Coating Machines?

2025.05.13

Author：pvc coating machine

The drying method of the PVC coating machine is one of the key factors affecting the coating quality and production efficiency. According to different process requirements and material characteristics, common drying methods mainly include the following:

1. Hot air circulation drying

Principle:

By heating the air to form hot air, circulate in the drying box, so that the solvent in the coating evaporates or the water evaporates to achieve the purpose of drying.

Features:

Wide applicability: suitable for solvent-based, water-based coatings and low-viscosity coatings.

Low equipment cost: simple structure and easy maintenance.

Medium drying speed: wind speed and temperature need to be controlled to avoid coating defects (such as bubbles, orange peel).

Application scenarios:

Production of PVC floor leather, decorative film, ordinary waterproof roll materials and other products.

2. Infrared (IR) drying

Principle:

Use infrared radiation to directly heat the coating surface, so that the molecular vibration generates heat and quickly evaporates the solvent or water.

Features:

Fast drying speed: energy directly acts on the coating, with high efficiency.

Local heating: heating can be targeted at specific areas to reduce energy waste.

High equipment cost: radiation distance and power need to be precisely controlled.

Application scenarios: PVC film, advertising materials and other products that require high drying speed.

3. Ultraviolet (UV) curing and drying

Principle: Through ultraviolet irradiation, the photoinitiator in the coating decomposes to produce free radicals, triggering the polymerization reaction of monomers or oligomers, and curing instantly.

Features:

Extremely fast curing speed: curing is usually completed within a few seconds.

Environmental protection and energy saving: no solvent is required, and VOC emissions are low.

Excellent coating performance: high hardness and good wear resistance.

High equipment cost: UV lamps and cooling systems are required.

Application scenarios:

High-end PVC decorative films, medical supplies, high-precision advertising materials, etc.

4. Microwave drying

Principle: Use microwave energy to make polar molecules (such as water molecules) in the coating vibrate at high speed to generate heat and achieve rapid drying.

Features:

Uniform drying: heating inside and outside at the same time to avoid surface hardening and causing internal solvent residues.

High efficiency: short drying time and low energy consumption.

Complex equipment: microwave leakage needs to be prevented, and safety requirements are high.

Application scenarios:

Thick-coated PVC products or areas with high requirements for drying uniformity.

5. Heat pump drying

Principle:

The heat pump system absorbs heat from the environment and releases it into the drying box after compression to achieve efficient and energy-saving drying.

Features:

Energy saving and environmental protection: high energy efficiency ratio and reduced energy consumption.

Precise temperature control: suitable for temperature-sensitive coatings.

High initial investment: but low long-term operating costs.

Application scenarios:

PVC product production with high environmental protection requirements, such as medical supplies and food packaging materials.

6. Combined drying method

In actual production, in order to improve drying efficiency and quality, a combination of multiple drying methods is often used, such as:

Hot air + UV curing: first remove most of the solvent through hot air drying, and then use UV curing to enhance the coating performance.

Infrared + hot air: infrared quickly heats the surface, and hot air assists in drying the inside.

PVC coating machines have various drying methods, and when choosing, you need to weigh them comprehensively according to product characteristics, production needs and environmental protection requirements. With technological advances, efficient, energy-saving and environmentally friendly drying methods (such as UV curing and heat pump drying) will gradually become mainstream, and combined drying methods will further enhance production flexibility and product quality.

Qingdao Chenan Machinery Co., Ltd. has the advantage of developing and producing rubber winding equipment, with higher technology than various equipment assembly manufacturers in the industry. For more information about pvc coating machine, please contact us.

Company: Qingdao Chenan Machinery Co., Ltd.

Address: Yanjialing Industrial Park, East Chengma Road, Tongji New Economic Zone, Jimo District, Qingdao City, Shandong Province

Email: qdcajx@gmail.com