For plastic packaging manufacturers in developing economies, controlling raw‑material expenditure is one of the most critical factors to improve market competitiveness. High‑calcium filled PP hollow sheets have become a popular low‑cost alternative to traditional pure‑PP corrugated boards for turnover boxes, packaging cases and protective sheets. However, most common PP hollow sheet extrusion equipment struggles to keep stable extrusion performance under high‑filler conditions, causing frequent break‑offs, poor sheet flatness and unstable output.

As an experienced manufacturer focused on PP hollow sheet extrusion technology, Qingdao Zhongsu Machinery Manufacturing Co., Ltd. has upgraded screw structure, feeding system and melting section specially for high‑calcium‑powder formulations. Our PP hollow sheet production line achieves two‑level stable filling performance:

1. Up to 80% calcium‑carbonate filler for dedicated special‑recipe boards under well‑adjusted raw‑material formula;

2. Maximum 65% calcium‑carbonate filler for daily‑produced standard packaging boards for carton making, maintaining good sheet rigidity, surface quality and continuous long‑time running stability.

Higher calcium‑carbonate loading replaces expensive polypropylene resin, helping customers reduce production costs significantly without sacrificing basic usability of hollow packaging boards. The line suits mass‑production of reusable packaging boxes, fruit turnover boxes, logistics crate sheets and protective boards widely used in emerging markets.

Apart from high‑fill adaptability, Zhongsu’s PP hollow sheet extrusion lines feature easy operation, low maintenance requirement and flexible parameter adjustment, which perfectly matches the production conditions and operator levels of factories in developing countries. We supply complete turn‑key projects including installation guidance, on‑site or remote technical training and long‑term after‑sales support.

We welcome global plastic machinery purchasers to contact us for technical datasheets, filler‑ratio test reports and customized quotation for high‑fill PP hollow sheet production projects.