A Collaborative Study of the Stability of Extrusion, Melt Spinning and Tubular Film Extrusion of some High-, Low- and Linear-Low Density Polyethylene Samples

2016 ◽  
Author(s):  
James L. White ◽  
Hideki Yamane
Keyword(s):  
Melt Spinning ◽  
Collaborative Study ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Film Extrusion ◽  
The Stability

scholarly journals Stability of Fried Fish Crackers as Influenced by Packaging material and Storage Temperatures

2019 ◽  
Vol 7 (2) ◽  
Author(s):  
Wan Zunairah Wan Ibadullah ◽  
Atiqah Aqilah Idris ◽  
Radhiah Shukri ◽  
Nor Afizah Mustapha ◽  
Nazamid Saari ◽  
...  
Keyword(s):  
Polyethylene Terephthalate ◽  
Storage Time ◽  
Chemical Properties ◽  
Thiobarbituric Acid ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Different Temperatures ◽  
Textural Changes ◽  
The Stability

The objective of the study was to determine the stability of fried fish crackers during storage at different temperatures. The physicochemical properties and lipid stability were examined at 25, 40 and 60°C for three months. Fried fish crackers were packed into two types of packaging with four different layers; (i) polyethylene terephthalate-polyethylene-aluminium-linear low density polyethylene (PET-PE-ALU-LLDPE), and (ii) oriented polypropylene-polyethylene-metallized polyethylene terephthalate-linear low density polyethylene (OPP-PE-MPET-LLDPE). The linear expansion and oil absorption in control fried fish cracker was 75.67 ± 5.86% and 27.86 ± 0.79%, respectively. The initial moisture of cracker ranged from 4.41 to 5.40% and decreased to 2.76 to 3.75%. There were also reductions in water activity of crackers from 0.503 to 0.243. For color, the loss occurred gradually within the storage time from 64 to 47% (L*), from 27 to 19% (b*), and increased from 4 to 9% (a*) due to lipid degradation. For both packaging, the hardness of crackers decreased significantly at 25°C and 40°C, but increased at 60°C. Regardless of temperatures and types of packaging, crispiness increased significantly throughout the storage. This textural changes were possible cause by a decrease in moisture content. The lipid yield of the cracker was not stable within the storage time and the concentration of conjugated dienes and thiobarbituric acid reactive substances (TBARS) showed a gradual increase. These results showed that fried fish crackers in the storage study had undergone lipid oxidation where changes in physical and chemical properties were observed.

scholarly journals Roles of Slip Agent in Blown Film Extrusion of Linear Low Density Polyethylene

2018 ◽  
Vol 14 ◽  
pp. 61-70 ◽  
Author(s):  
Nur Haslina Nasirah Abdul Hadi ◽  
◽  
Mohd Fairuz Zainal Abidin ◽  
Raa Khimi Shuib ◽  
◽  
...  
Keyword(s):  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Film Extrusion ◽  
Blown Film ◽  
Slip Agent ◽  
Blown Film Extrusion

scholarly journals Novel results and potential applications of bitumen used as an additive for polyethylene

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Goretti Goikoetxeaundia ◽  
Alexander Mateos ◽  
Oscar González ◽  
María Eugenia Muñoz ◽  
Anton Santamaría ◽  
...  
Keyword(s):  
Carbon Black ◽  
Polymer Films ◽  
Melt Spinning ◽  
Tensile Modulus ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Film Blowing ◽  
Carbon Black Powder ◽  
Potential Applications

AbstractA metallocene catalysed linear low density polyethylene (mLLDPE) was mixed with very low amounts of bitumen (1-2%) as an additive. Bitumen interacts with mLLDPE giving rise to a dying effect, which turns the originally white mLLDPE extrudates into black. No slippage is observed during extrusion and sharkskin is postponed as bitumen is added. “Melt strength” values of the blends, determined in melt spinning experiments, are very similar to those of mLLDPE. Accordingly good performance is expected in film-blowing process. Tensile modulus values are higher than 109 Pa. Bitumen emerges as an alternative to carbon black powder currently used to obtain black polymer films.

Sign in / Sign up

Export Citation Format

Share Document