Agricultural film extrusion lines are generally designed for three-layer production and increasingly also for five layers. Key applications are either thin mulching films (20-60 µm) or greenhouse films (150-250 µm), depending on the design of the production line. The most important difference between the various line concepts is the type of the haul-off unit used, i.e. reversing for thin films and stationary for thick films.
 
Since the plastic film market is demanding ever higher flexibility and efficiency, processing companies can take full advantage of their lines only if they are able to produce multi-web film of as wide layflat widths as possible. That is why Reifenhäuser Kiefel is providing both their three- and five-layer agricultural film lines with reversing haul-off units in widths of 4000m, capable of producing film of up to 13 m circumference.   
 
Today, the most different products can be produced on these lines, such as thin mulching films in thicknesses of up to 20 µm. However, the range also includes greenhouse film of up to 250 µm thickness, blown silage film and covering film.
Over the past years, a further application for these large production lines has developed. Container liners used to protect the goods (e.g. plastic pellets) during transport against impurities and humidity are  produced to an increasing degree.
 
This broad product range implies the ability of extruder and blown film die-head to process very different types of raw materials and a lot of - often very expensive - additives, into films of optimum quality. High output capacities are a further prerequisite for an economical production. These can be obtained using Reifenhäuser Kiefel’s low-temperature screws developed for raw materials such as LDPE, LLDPE, mLLDPE, EVA, EBA and HDPE, and the company’s rheologically optimised blown film die-heads.