Dalian Liaonan Donghua Plastic Machinery Co., Ltd. is a plastic machinery manufacturer that integrates scientific research, design, and manufacturing. The company has strong capabilities and R&D strength, absorbing and digesting advanced foreign technologies to continuously develop new products and technologies. Many of its product technologies have filled domestic gaps and have been awarded multiple national technology patents. The products are sold throughout China and exported to the Middle East, Europe, America, and Southeast Asia. The main products include: heat shrink film machines, stretch wrapping film machines, up-blow and down-blow single-layer, double-layer, triple-layer, five-layer, seven-layer, and nine-layer co-extrusion blow film machines (equipped with various types such as rotating die head and rotating haul-off); single-layer and multi-layer (up to nine layers) cast film (sheet, plate) machines, various agricultural films, mulch films, and greenhouse film machines; various single-layer and multi-layer pipe extrusion machines, etc.; multi-layer co-extrusion blow film machines can be equipped with multi-layer co-extrusion stacking die heads; equipped with short flow channel, low-height multi-layer spiral die heads. To increase the production line speed and achieve better film transparency, an internal cooling system can be added to the die head.