Custom Plastic Injection Molding Services in Southern California

Norco Plastics has established itself as a premier provider of custom plastic injection molding throughout Southern California by combining advanced manufacturing processes with exceptional customer service. Our injection molding expertise spans over five decades, allowing us to perfect the manufacturing process for a wide range of applications. We've invested in high-performance molding machines with large tonnage capacity, enabling us to handle diverse projects across multiple industries. Our facility in Chino strategically serves clients throughout Los Angeles, Orange, Riverside, San Bernardino, and San Diego counties with rapid delivery capabilities. What truly differentiates us is our comprehensive approach - from material selection guidance to quality assurance, we offer complete manufacturing solutions that optimize both product quality and production efficiency. Our team works closely with clients to ensure each custom plastic component meets exact specifications, whether for consumer products, medical applications, or industrial uses.

Our facility works with an extensive range of plastic materials to meet diverse application requirements. Beyond standard thermoplastics, we process specialty materials including polyethylene terephthalate for food packaging and related applications, as well as engineering plastics with enhanced chemical resistance and mechanical properties. For applications requiring flexibility, we can recommend polyurethane molding and silicone rubber options. Many of our production parts utilize glass-reinforced composites to achieve superior strength-to-weight ratios. We carefully evaluate factors like melting point, moisture absorption, and chemical resistance when helping clients select appropriate materials. Our technical capabilities extend to precise mold tooling design and fabrication, with our mold tools engineered for optimal performance and longevity. We offer various mold finishes depending on the required surface appearance of the final product. Each mold cavity is precisely engineered to ensure proper fill patterns and consistent wall thickness throughout the part. For specialized requirements, we can implement decoupled molding techniques to optimize part quality during the molding process.

Our production facility features advanced injection molding machines ranging from 30 to 2800 tons, each equipped with sophisticated control systems for precise process monitoring. These molding machines allow us to optimize critical parameters throughout the injection molding process, including barrel temperature control, injection pressure, and cooling rates. We employ decoupled molding techniques that separate the filling and packing phases, resulting in reduced internal stress in the finished parts. Our process monitoring system tracks how molten plastic flows into each mold cavity, ensuring complete fills and preventing common defects. For production parts requiring exceptional consistency, we utilize statistical process control methodologies to monitor critical dimensions and performance attributes across production runs. Our machine operators and quality technicians are trained to evaluate how variations in the manufacturing process might affect finished part quality. This comprehensive approach to production molding ensures consistent quality while maximizing efficiency. Regular preventative maintenance of both molding machines and tooling prevents unexpected downtime and extends equipment life.

Beyond standard injection, we offer several specialized molding techniques to address complex production requirements. Our multi-material molding capabilities allow us to create parts with different material properties in a single component, eliminating assembly steps and creating more durable products. Insert molding enables the embedding of metal components or other materials within plastic parts during the molding process, creating strong structural connections without secondary operations. We utilize polyurethane molding for applications requiring enhanced flexibility, impact resistance, or specialized performance characteristics. For projects requiring precise tolerances, our decoupled molding approach separates the filling and packing phases to minimize internal stresses. Production molding of high-precision components like plastic gears or medical devices often requires specialized mold cavity designs with features like sliding shutoffs or unique ejection mechanisms. We offer various molding options for thin-wall applications that require controlled flow of molten plastic to achieve uniform wall thickness while preventing defects. Each technique is selected based on product requirements, production volume, and performance specifications to deliver optimal results.

Material consistency is critical to our manufacturing process, beginning with careful sourcing of plastic materials from trusted suppliers. For moisture-sensitive materials like polybutylene terephthalate or nylon, we implement proper drying procedures prior to processing to prevent moisture absorption issues that could compromise product integrity. Our process technicians carefully monitor the melting point of each plastic type to ensure proper flow characteristics while preventing material degradation. The manufacturing process includes precise control of how molten plastic enters the mold cavity, with adjustments made for specific material properties and part geometry. Materials with high chemical resistance often require special processing conditions to maintain their performance characteristics. For production parts requiring certified materials, we maintain complete traceability documentation. Engineering plastics with specialized additives are handled according to manufacturer guidelines to preserve their unique properties. Our quality verification procedures include checking for proper material flow patterns and fusion lines to confirm optimal processing conditions. By implementing these material management protocols, we ensure consistent results across production runs while maximizing the performance properties of each plastic type.

Our comprehensive quality assurance system begins with First Article Inspection (FAI) to verify that initial production parts meet all specifications before volume production begins. Throughout manufacturing, we implement Statistical Process Control (SPC) to monitor critical dimensions and identify potential variations before they affect product quality. Our quality team conducts regular visual inspections for cosmetic defects, particularly on parts with critical appearance requirements or specialized mold finishes. For applications with strict performance requirements, we can coordinate testing for mechanical properties, chemical resistance, and environmental stability per customer specifications. Material certifications are maintained for traceability and compliance documentation. Our quality procedures include thorough tool validation to ensure each mold cavity produces consistent parts, with particular attention to wall thickness uniformity in multi-cavity tools. The quality control process extends to assembly operations, with verification of component fit and function for multi-part assemblies. These robust procedures ensure that our production delivers consistent, high-quality plastic products that meet or exceed customer expectations in every manufacturing run.

Our tooling maintenance program is designed to maximize the service life of injection molds while preventing unexpected production interruptions. We implement scheduled preventative maintenance based on shot count rather than waiting for issues to develop. Regular cleaning and inspection of mold tools removes residue build-up and identifies potential problems early. For projects using abrasive materials like glass-reinforced composites, we implement more frequent maintenance intervals to address accelerated wear patterns. This systematic approach to mold maintenance provides significant benefits: extended tool lifespan, consistent part quality, and minimized production downtime. Our maintenance protocols include regular polishing of core and cavity surfaces to maintain proper material flow and optimal mold finishes on the final parts. The maintenance program also includes regular inspection of cooling channels to ensure proper temperature control during the molding process. For production parts with critical tolerances, we verify dimensional stability after maintenance procedures to confirm consistent quality. Proper mold tool maintenance is essential not only for longevity but also for maintaining part consistency throughout the production lifecycle.