The relationships between crystallization characteristics and heat sealing properties of high-density polyethylene films. (January 2014)

• Record Type: Journal Article
• Authors: Miyata, Ken; Ozama, Taku; Nishioka, Akihiro; Koda, Tomonori; Murasawa, Go
• Is Part Of: Journal of plastic film and sheeting. Volume 30:Number 1(2014:Jan.)
• Page Start: 28
• Page End: 47
• Publication Date: 2014-01
• Subjects: Film processing -- heat sealing -- molecular structure -- crystallization -- crystalline orientation -- polyethylene; City planning -- Bibliography -- Periodicals; 668.495
• DOI: 10.1177/8756087913487542
• Languages: English
• ISSNs: 8756-0879

Abstract

The relationships between crystallization characteristics and heat sealing properties of high-density polyethylene (HDPE) films were determined. HDPE with a 1.1 g/10 min melt flow index (MFI) (190℃, 2.16 kg) was melt mixed in a twin-screw extruder with a 0.04 g/10 min MFI HDPE. The high molecular weight HDPE (HMW HDPE) concentration was varied between 1 and 20 wt%. The HDPE blends were cast into a 50 µm thick film. The films were heat sealed at 125℃ and 128℃. The seal bar pressure was kept constant at 0.13 MPa. The heat seal time was varied from 0.5 to 2.0 s. Heat-sealed strength was measured by T-peel test. The molecular structure development during the heat seal process was evaluated by differential scanning calorimeter and wide-angle X-ray diffraction. The HMW HDPE decreased the film heat seal strength when sealed at 125℃. However, at 128℃ the presence of up to 10 wt% reduced the heat sealing time.