Characterisation of heat-sealing part of laminated oriented nylon and polyethylene films

Abstract

In order to clarify the relationship between heat-sealing conditions and the strength of the heatsealed part, the crystalline structure of the heat-sealed part of the film was evaluated by differential scanning calorimetry (DSC) and Fourier transform infrared (FT IR) spectroscopy. The laminated films that include a biaxially oriented nylon (ONY) film and a cast linear low-density polyethylene (LLDPE) film with an appropriate adhesive were heat-sealed by using an impulse type heat-sealer. First the possibility of adhesion was examined by changing the processing conditions and the maximum temperature was measured. As for mechanical properties, a peel strength test was performed to evaluate the strength of the heat-sealed parts. However, the strength could not be evaluated by the peeling test alone, because the fracture shifted from the heat-sealed part to the edge of the heat seal accompanied by necking and yielding of the film. In order to solve this problem, a tensile specimen with a semicircular notch was proposed to evaluate the strength of the heat-sealed part. Tensile strength increased with increasing crystallinity of the LLDPE indicated by the melting peak in the DSC measurement and FT IR spectra. It was found that crystallinity profoundly affected the mechanical properties of the heatsealed part.

Heat seal properties of polymer–aluminum–polymer composite films for application in pouch lithium-ion battery

“…9 In a certain regime, the HSS is reduced because of crack formation caused by the enhanced quench cooling effect. 8 Inuence of dwell time on HSS Fig. 6 shows the effect of dwell time on the HSS at different temperatures for all ve composite lms.…”

“…Polymer-metal-polymer composite lms are widely used in packaging [1][2][3][4][5][6][7][8][9][10] and more recently in construction and cooling as the envelope material for vacuum insulation panels. 7,[11][12][13][14][15] Most recently, these composite lms have been used in so-packaged or pouch lithium-ion batteries (LIBs).…”

“…Planes et al 7 investigated the heat-sealing properties of composites of one PE layer and one or three aluminum-coated polyethylene terephthalate (PET) layers, optimizing the heat sealing parameters of such composite polymeric lms. Tsujii et al 8 studied the effect of the crystallinity of oriented PA-and LLDPE-laminated lms on the strength of the heat seal, nding profound effects of crystallinity on the mechanical properties. Tetsuya et al 9 studied the effect of the heat-sealing temperature on the mechanical properties and morphologies of oriented polypropylene (OPP)/cast polypropylene (CPP) laminated lms.…”

Analyzing Impact Strength Improvement in Polymer Laminates: A Comparative Study of Machine Direction Oriented (MDO)-PE/LLDPE and Polyamide (PA)/LLDPE Structures

“…Over time, these cross-links become more abundant and sturdier. Its is heightened cross-linking diminishes the mobility of polymer chains, making the material more challenging and more resistant to both peeling and impact forces [20,21].…”