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Stretch Hood - Design

Interactive tool to help determine optimal hood dimension and die diameter.

All technical assistance and advice is furnished by LyondellBasell without compensation. LyondellBasell assumes no obligation or liability with respect to such advice and assistance and disclaims any and all warranties with respect to such advice and assistance.

Stretch Hood Calculator

Which tube circumference do you need to produce ?   mm !Please insert a value between 800 and 5000 Load/Pallet dimensions Long side Lp mm !Please insert a value between 400 and 2500 Short side lp mm !Please insert a value between 250 and 2000 Clearance i.e. distance between film and pallet (must be at least 50 mm)   d mm !Please input a clearance value of at least 50 mm   Calculate

Calculation Results Initial stretching ratio (maximal tube stretching on the packaging line) 100 % ! Residual stretching ratio     % ! ! Based on our experience, optimal film properties are obtained with the following extrusion parameters: -Blow-up ratio 3.3 (+/- 0.3) -Narrow die gap (max. 1.2 mm) Your optimal die diameter dimensions are (calculated respectively for BUR 3 and 3.6): fromtomm Remarks: Die gap and die diameter are an essential component of stretch hood performance in terms of high flexibility and general purpose stretch hood formulations Tests have shown that high performance film is less sensitive to BUR and can be processed at low BUR, e.g. as low as 2:1, while maintaining superior mechanical strength.

 

If you are interested in learning more about LyondellBasell's grades used in Stretch Hood applications please contact stretch.hood@lyondellbasell.com