Analysis of Surface Irregularities in Injection Molded Products
Surface irregularities in injection molded products are a common issue that can be caused by a variety of factors. Below is a detailed analysis of the potential causes:
1. Mold-Related Factors
Mold surface quality issues: Scratches, rust, and machining marks on the mold surface can lead to surface irregularities in the product.
Uneven parting line: The parting line is a critical component of the mold. If it is uneven, it will directly affect the appearance of the product.
Improper cooling system design: An improperly designed cooling system can cause uneven cooling of the plastic part, resulting in warping and deformation.
Inappropriate choice of mold material: The hardness, wear resistance, and other properties of the mold material directly affect the service life and product quality of the mold.
Mold deformation: Long-term use or uneven stress can cause mold deformation, affecting product accuracy.
2. Injection Molding Process Parameters
Excessive or insufficient injection pressure: Excessive injection pressure can lead to flash, while insufficient pressure can result in incomplete filling.
Excessive or insufficient injection speed: Excessive injection speed can cause weld lines, while too slow a speed can cause uneven cooling.
Excessive or insufficient holding time: Excessive holding time can cause the plastic part to shrink, while insufficient holding time can lead to surface irregularities.
Excessive or insufficient mold temperature: Excessive mold temperature can cause the plastic part to deform, while too low a temperature can lead to excessive cooling time.
3. Plastic Raw Material Issues
Excessive moisture content in the raw material: Moisture can generate bubbles, leading to surface irregularities.
Uneven particle size of the raw material: Uneven particle size can affect the flowability of the melt.
Aging of the raw material: Aged raw materials have degraded properties and are more prone to defects.
