Comparison of LSR Molding vs. Compression Molding Cross Slit Silicone Valves

Cross slit silicone valves are a significant category within silicone valve applications, commonly used in industries like food and beverage packaging and medical devices. Made from eco-friendly, food-grade or medical-grade silicone, these valves feature a unique cross slit design that ensures precise fluid direction and flow control. There are two main molding processes used to manufacture cross slit silicone valves: Liquid Silicone Rubber (LSR) molding and Compression molding. We’ll provide a comprehensive comparison of both methods to help you make an informed decision.

Process Comparison

LSR Molding Cross Slit Silicone Valves

• Process Overview: The LSR molding process uses liquid silicone rubber (LSR) that rapidly cures under specific temperature and pressure conditions.

• Production Workflow: LSR molding → Inspection → Deflashing → Cross Slit Punching → Slit Inspection → Shaping → Final Inspection → Packaging.

• Advantages: Ideal for products with complex shapes and high precision requirements. The fluidity of liquid silicone allows it to fill intricate mold details perfectly, ensuring a high level of accuracy in the final product.

Compression Molding Cross Slit Silicone Valves

• Process Overview: In compression molding, solid silicone is heated and softened, then placed into a mold and compressed to form the final shape.

• Production Workflow: Mixing → Compression molding → Deflashing →Post Curing → Slit Cutting& Punching → Inspection → Packaging.

• Advantages: Suitable for larger, simpler shapes and products with higher hardness. The process is stable, and the costs are relatively lower compared to LSR molding.

Product Feature Comparison

LSR Molding Cross Slit Silicone Valves

• Softness & Elasticity: Exceptional softness and elasticity, making it ideal for high sealing performance and precise flow control.

• Surface Smoothness: The surface is smooth and flawless, with highly accurate dimensions, ensuring seamless assembly.

• Heat Resistance & Durability: Outstanding heat resistance, and weather resistance, making it stable in a wide range of harsh environments.

Compression Molding Cross Slit Silicone Valves

• Hardness & Density: Higher hardness and density, providing excellent mechanical strength and wear resistance.

• Aging Resistance: May exhibit slightly less resistance to aging compared to LSR molding due to oxidation effects during the heating process.

• Sealing & Flow Control: The sealing performance and flow control precision may not be as high as that of LSR molding silicone valves.

Applications Comparison

LSR Molding Cross Slit Silicone Valves

• Food Packaging: High precision in sealing and flow control to meet food packaging requirements.

• Cosmetic Caps: Ensures the quality and safety of cosmetic products.

• Medical Devices: Medical-grade silicone ensures reliability and safety in medical equipment.

Compression Molding Cross Slit Silicone Valves

• Mechanical Seals: High hardness and wear resistance allow these valves to handle high-pressure and friction conditions.

• Automotive Components: Provides stable sealing performance for automotive parts to ensure their efficiency and reliability.

Production Efficiency & Cost Comparison

LSR Molding Cross Slit Silicone Valves

• Production Efficiency: The rapid filling and curing of liquid silicone enable high production efficiency.

• Cost: The precision of the equipment and molds used in LSR molding results in higher production costs.

Compression Molding Cross Slit Silicone Valves

• Production Efficiency: The heating and compressing of solid silicone takes more time, resulting in slightly lower efficiency.

• Cost: Equipment and mold costs are relatively lower, and the process is more stable, leading to lower overall production costs.

Both LSR molding and compression molding offer distinct advantages, and the choice of process depends on your specific requirements. LSR molding excels in precision, soft touch, and flow control, making it ideal for high-end applications such as food packaging, cosmetics, and medical devices. In contrast, compression molding is more cost-effective and suited for larger, simpler products with higher hardness and mechanical strength. Our factory has over a decade of experience in producing cross slit silicone valves. With our class-100,000 cleanroom, automated punching equipment, and AOI automated inspection systems, we ensure the highest product quality and precision. We invite you to contact us for any cross slit silicone valve needs! We are committed to providing professional and efficient services to help your projects succeed!