Effect of Processing Conditions on Heat Seal Strength for Peelable Heat Sealing of Multilayered Polyethylene Films with Different Sealant Layers

2017 ◽  
Vol 56 (9) ◽  
pp. 709-723
Author(s):  
Toshiharu Iwasaki ◽  
Wataru Takarada ◽  
Takeshi Kikutani
Keyword(s):  
Processing Conditions ◽  
Polyethylene Films ◽  
Heat Sealing ◽  
Heat Seal ◽  
Seal Strength

Influence of processing conditions on heat sealing behavior and resultant heat seal strength for peelable heat sealing of multilayered polyethylene films

2016 ◽  
Vol 36 (9) ◽  
pp. 909-916 ◽  
Author(s):  
Toshiharu Iwasaki ◽  
Wataru Takarada ◽  
Takeshi Kikutani
Keyword(s):  
Interface Temperature ◽  
Processing Conditions ◽  
Polyethylene Films ◽  
Flat Shape ◽  
Heat Sealing ◽  
Heat Seal ◽  
Maximum Temperatures ◽  
Sealing Pressure ◽  
Seal Strength

Abstract The effects of processing conditions for peelable heat sealing of multilayered polyethylene (PE) films on heat sealing behavior and heat seal strength were investigated. Two sets of seal bars, knurled shape and flat shape, were used for heat sealing. After the heat sealing, the sealed portion was cooled using a set of cooling bars. Heat sealing temperature was adjusted to yield the heat seal strength of 4.0 N/15 mm, 6.0 N/15 mm and 8.0 N/15 mm at the heat sealing pressure of 0.4 MPa for each set of heat sealing bars. The heat seal strength increased with the increase of heat sealing pressure for the knurled shape bars, while it was less affected by heat sealing pressure for the flat shape bars. In situ measurements of the sealing bar clearance and interface temperature revealed that the reduction speed of clearance was significantly affected by the pressure for knurled shape bars, while it was almost independent of pressure for flat shape bars. Even though the temperatures set for the similar heat seal strength were different between knurled and flat shape bars, the maximum temperatures at the interface were almost identical. The effect of the shape of seal bars on heat seal strength became less significant after the sterilization process.

Influence of lithium hexafluorophosphate/ethylene carbonate/dimethyl carbonate electrolyte soaking on heat seal strength of polyamide 6/aluminum/cast-polypropylene laminates used as lithium-ion battery packaging

2016 ◽  
Vol 34 (1) ◽  
pp. 10-26 ◽  
Author(s):  
Zhansheng Guo ◽  
Yang Fan ◽  
Shiyu Du
Keyword(s):  
Failure Modes ◽  
Dimethyl Carbonate ◽  
Storage Temperature ◽  
Ethylene Carbonate ◽  
Lithium Ion ◽  
Soaking Time ◽  
Heat Sealing ◽  
Heat Seal ◽  
Seal Strength ◽  
Lithium Hexafluorophosphate

The heat-seal strength of polymer–metal–polymer laminates, widely used in the packaging industry and more recently for pouch lithium-ion batteries, is a critical factor for the integrity of flexible package structures during service. The influences of lithium hexafluorophosphate/ethylene carbonate/dimethyl carbonate (LiPF6/EC/DMC) electrolyte soaking time and storage temperature on heat-seal strength were investigated through T-peel testing using a universal testing machine. Sealed multilayer laminates’ heat-seal strength and their failure modes were measured for specimens sealed at various heat-sealing temperatures and dwell times before and after exposure to room temperature and 60℃ soaking conditions. The soaking condition significantly influences heat-seal strength, especially for the packages heat-sealed at low temperatures and short heat-sealing times. Higher storage temperature during electrolyte-soaking accelerates the heat-seal strength decrease. Failure modes are affected by the soaking conditions and become more complicated than the packages without soaking. The optimized heat-sealing processing window is obtained under a certain soaking condition. The electrolyte hydrogen ion concentration (pH) decreases with longer soaking time and higher storage temperature, indicating that acidification may also contribute to decreased heat-seal strength. The results are important for understanding how stored lithium-ion batteries deteriorate and can help to guide battery design to maximize their shelf life.

The durability of press-formed paperboard trays – Effects of sealing and drying

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 236-248
Author(s):  
Arvo Niini ◽  
Ville Leminin ◽  
Panu Tanninen ◽  
Juha Varis ◽  
Teija Laukala
Keyword(s):  
Dimensional Stability ◽  
Food Processing ◽  
Positive Impact ◽  
Processing Conditions ◽  
Optical Analysis ◽  
Heating And Cooling ◽  
The Press ◽  
Heat Sealing ◽  
Dimensional Measurements ◽  
The Impact

Dimensional measurements were recorded to observe the durability of press-formed paperboard trays used for food processing via heating and cooling of the paperboard trays containing oatmeal. A set of the studied press-formed paperboard trays were dried before being heated, and a set of the paperboard trays were heat-sealed before being cooled to compare the effects of drying and sealing on the durability of the tray. In addition, empty trays were heated to observe the impact of food processing conditions on its durability via leak tests with a colouring solution as well as optical analysis of the material coating on the surface of the trays. The drying process of the trays was observed to improve the dimensional stability of the trays while being heated, and heat-sealing the trays yielded a major positive impact on the dimensional stability of the trays while being cooled. The leak tests and optical analysis results on the heated empty trays showed a negative durability impact from the food processing conditions. It was concluded that adjusting the heat-sealing parameters and food processing conditions is necessary in order to achieve improved durability of the press-formed paperboard trays for food processing purposes.

PACKAGING: VI. THE RELATIVE MERITS OF VARIOUS TYPES OF BAG CONSTRUCTION IN PRODUCING WATER-VAPOUR RESISTANT PACKAGES

1947 ◽  
Vol 25f (1) ◽  
pp. 8-12
Author(s):  
C. G. Lavers
Keyword(s):  
Water Vapour ◽  
Heat Sealing ◽  
Heat Seal ◽  
Water Vapour Resistance

Water-vapour penetration was measured on pouch, flat, wedge, and square liner bags fabricated from Reynold's Metal A-51, 300 M.S.A.T. "Cellophane" coated 40 lb. per ream with a flexible wax composition, 55 lb. laminated bleached glassine, and 300 M.S.A.T. Cellophane. The bags were closed, where the material permitted, by heat-, glue-, and pressure-sealing, and by folding with or without tin-tie closures.When Reynold's Metal A-51 or waxed Cellophane was used, excellent water-vapour resistance could be achieved with any of the bag types investigated, and a folded closure was as efficient as a heat-seal. With all materials except 300 M.S.A.T. Cellophane, bags made with glue were almost as good as those with heat-sealed construction. Unwaxed Cellophane or glassine provided more protection when the simpler forms of bags (pouch) were used. With unwaxed Cellophane, heat-sealing appeared to make a better liner than the use of glue, and a heat- or glue-sealed closure was superior to a double fold.

Sign in / Sign up

Export Citation Format

Share Document