Located in Ningbo, the “Capital of China’s Plastics Machinery”, Ningbo Konger Machinery Co., Ltd. has been deeply engaged in the R&D and manufacturing of injection molding equipment since its founding in 2013. With 19 patented technologies and a comprehensive service system, the company has become a leader among national high‑tech enterprises. Its core product – Dual‑Color Sandwich Injection Molding Technology – reshapes the production landscape of the injection molding industry with the unique advantages of cost efficiency in the core layer and premium quality on the surface. Konger’s dual‑color sandwich injection molding, also known as co-injection / sandwich molding, is an advanced one‑step molding process featuring precise control from dual barrels. It is like putting a “sandwich coat” on plastic products:

• The outer layer uses virgin material to ensure appearance, texture and structural strength.
• The inner core can use recycled or lower‑cost materials to minimize production costs without compromising performance.In this way, a perfect balance between quality and cost is achieved.

Different from conventional injection molding, the sandwich molding technology integrated into Konger’s CMS Chameleon Series injection molding machines adopts a breakthrough parallel dual injection units with shared single nozzle structure. It allows seamless compatibility with existing single‑color molds – no mold modification or mold base replacement is needed. Manufacturers can directly switch among sandwich, dual‑color and multi‑color production, greatly reducing upgrade costs. It is one of the most mold‑universal solutions in the industry. This technology helps enterprises reduce overall costs by 15%–25%, eliminate secondary processing, improve productivity and reduce labor input, while significantly improving product qualification rates by lowering defects caused by post‑processing. Backed by strong R&D capabilities, Konger’s CMS dual‑color sandwich injection molding is widely applied in automotive, consumer electronics, home appliances, daily necessities, pet toys (chews) and other key industries, with numerous mature cases widely recognized in the market.

• Automotive Industry: Konger provided a customized solution for a well‑known Chinese automaker to produce interior door panels. The structure of weather‑resistant PMMA surface + low‑cost ABS core passed strict 85‑cycle weathering tests and achieved a 20% reduction in unit cost, saving nearly one million yuan in material costs annually. The finish rivals high‑end interiors and completely replaces painting, avoiding scratches and peeling.
• Consumer Electronics: For precision earphone housings, transparent PC surface + structural core layer creates a deep crystal‑like appearance. With compliant recycled material in the core, the defect rate is controlled within 1% and efficiency increased by 30%.
• Medical Industry: For syringes and medical disposables, FDA‑approved medical‑grade PP is used for the surface, with qualified recycled material in the core, meeting strict hygiene and dimensional accuracy while greatly cutting material costs.
• Pet Toy Industry: For chew balls and interactive sound toys, eco‑friendly TPE surface + low‑cost PP core is adopted. The TPE layer complies with FDA and REACH standards, non‑toxic, soft, elastic and tear‑resistant. Unit cost is reduced by 18%, production efficiency increased by 25%, and delamination is eliminated through one‑step molding.
• Household Products: For food‑grade storage boxes and kitchen containers, food‑safe PP surface + recycled PP core ensures safety, easy cleaning, load capacity and sealing. Overall production cost is reduced by 22%, and issues such as color difference and burrs are resolved without secondary processing.

As a professional solution provider focusing on niche markets, Konger not only possesses high‑standard production capacity but also offers tailored customized solutions, 7×24 online service and lifetime maintenance support. The company has established offices in more than 20 cities across China, and its products are exported to many countries and regions worldwide. From technological innovation to service upgrading, Ningbo Konger focuses on dual‑color sandwich injection molding to break the limitations of traditional molding. It aligns with the concept of green manufacturing and effectively solves the industry pain points of “difficult cost control while maintaining quality”. Konger helps injection molding enterprises stand out from homogeneous competition, seize opportunities in industrial transformation, and lead the future of the injection molding industry with technological strength.