What factors affect the quality of PVC foam board?

1. Raw material quality
1. Selection of PVC resin
PVC resin is the main component of PVC foam board, and its quality directly affects the physical properties and chemical stability of the product. High-quality PVC resin should have good thermal stability, processability and anti-aging properties.

2. Foaming agent and foaming regulator
Foaming agent and foaming regulator are the key to controlling foam structure and density. Excessive or insufficient foaming agent, as well as improper quality and model selection of foaming regulator, will lead to uneven foam structure, affecting the mechanical properties and service life of the product.

3. Stabilizer
The stabilizer is used to prevent thermal degradation and photodegradation of PVC during processing and use. The type and amount of stabilizer directly affect the stability and durability of the product.

2. Production process

1. Extrusion temperature
Extrusion temperature is one of the important factors affecting the quality of PVC foam board. Too high temperature will cause over-plasticization of PVC resin, making the foam structure loose and the strength decreased; too low temperature will affect the plasticization effect of PVC, resulting in a rough surface and uneven internal structure of the product. Therefore, the extrusion temperature needs to be strictly controlled to ensure that it fluctuates within a reasonable range.

2. Screw speed and traction speed
The matching of screw speed and traction speed is crucial to ensure the uniformity and stability of the product. Too fast or too slow screw speed, as well as unstable traction speed, will lead to uneven material flow during extrusion, affecting the quality and appearance of the product.

3. Cooling system
The function of the cooling system is to quickly cool down the extruded PVC foam board. If the cooling is insufficient or uneven, the product will be deformed, warped or have a rough surface. Therefore, it is necessary to ensure that the cooling system operates normally and adjust the cooling time and method according to the product specifications and thickness.

III. Lubrication system
1. Internal lubricant and external lubricant
Lubricants play a vital role in the production process of PVC foam boards. Internal lubricants help improve the plasticization and melt fluidity of PVC resins; external lubricants are conducive to demolding and improving the surface finish of the product. If the lubricant is used inappropriately or the type is not selected appropriately, it will lead to problems such as rough product surface, precipitates or uneven internal structure.

2. Lubrication balance
The balance of internal and external lubricants is crucial to ensure product quality. Insufficient internal lubrication will make it difficult to control the thickness of the board surface, which is manifested as thick in the middle and thin on both sides; excessive external lubrication will cause serious precipitation on the surface of the board, affecting the appearance and performance. Therefore, it is necessary to adjust the amount and type of lubricant according to the specific production process and product requirements.

IV. Equipment status and operation technology
1. Equipment status
The status of the production equipment directly affects the quality and stability of the product. If the equipment is aged, severely worn or improperly maintained, it will problems such as uneven material flow and inaccurate temperature control during extrusion. Therefore, it is necessary to regularly maintain and service the equipment to ensure that it is in good working condition.

2. Operation technology
The skill level and experience of the operator are also crucial to ensure product quality. Skilled operators can accurately control key parameters such as extrusion temperature, screw speed, and traction speed, and promptly detect and handle abnormal conditions in the production process to ensure stable and reliable product quality.

The quality of PVC foam board is affected by multiple factors such as raw material quality, production process, lubrication system, equipment status and operation technology. In order to improve the quality of PVC foam boards, it is necessary to start from these aspects and take comprehensive measures to improve and optimize them.