Based on global recognition, range of products, and industry presence, here are three prominent manufacturers of plastic crushers (also commonly called plastic granulators, plastic crusher or shredders):

1. Renmar Plastic Machinery
Based in the UK, Renmar is a leading supplier of auxiliary plastics equipment, including a wide range of granulators. They are known for their high-quality, durable machines suitable for recycling injection molding, 

blow molding, and extrusion scrap. Renmar offers various models from beside-the-press granulators to central heavy-duty crushers.

2. XINYI MACHINERY
A leading manufacturer based in China, XINYI produces a vast array of plastic processing machinery, plastic recycling machines, and other equipment. They are known for offering cost-effective and reliable plastic

 crushers and shredders for various applications, from small to large-scale recycling operations. Their strong production capacity makes them a key supplier in the global market. Their machines and parts are

 famous for good quality and reasonable price and exported to more than 60 countries.

3. Netplasmak A.S.
A Turkish manufacturer with a significant international footprint, Netplasmak specializes in plastic recycling machinery. They produce robust and efficient plastic crushers, shredders, and complete washing lines. 

Their strength lies in providing solutions for post-consumer and industrial plastic waste recycling.