Thermal behaviors of heat shrinkable poly(vinyl chloride) film

Hong, Chang Kook; Maeng, Hakmyun; Song, Kigook; Kaang, Shinyoung

doi:10.1002/app.29550

Cited by 16 publications

(15 citation statements)

References 22 publications

(37 reference statements)

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“…For polymers, the percent shrinkage is believed to enhance with increased molecular orientation. Thus, the effects observed in shrinkage results can be a suitable qualitative estimation in terms of the orientation structure of crystal and amorphous region in PE trilayer films . Figure presents the thermal shrinkage rate of the trilayer film samples via oil bath.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the effects observed in shrinkage results can be a suitable qualitative estimation in terms of the orientation structure of crystal and amorphous region in PE trilayer films. 1 Figure 2 presents the thermal shrinkage rate of the trilayer film samples via oil bath. From Figure 2, all samples featured a lower TD shrinkage rate than MD shrinkage rate.…”

Section: Heat Shrinkage Performancesmentioning

confidence: 99%

“…When heat shrinkage film is thermally treated in an unconstrained state, the highly ordered polymer molecular chains in low entropy state will rapidly collapse through a coordinated set of molecular motions and then return to the state of high entropy. Such shrinkage would induce the shape changes of the film as its length shortens and wraps the articles . Thus, heat shrinkable films are witnessing tremendous application in the packaging industry, including food, drinking, and merchandise packaging.…”

Section: Introductionmentioning

confidence: 99%

“…In most packaging applications, possessing high shrinkage force is desirable, while maintaining good mechanical performances is also crucial. To achieve polymer products with excellent shrinkage and mechanical performances, various approaches have been proposed and intensively developed in recent years . Khonakdar et al combined chemical cross‐linking and the process of heating‐stretching‐cooling together to fabricate heat shrinkable materials and studied the effect of peroxide contents and processing parameters on the thermal and shrinkage behaviours of polyolefin.…”

Section: Introductionmentioning

confidence: 99%

“…Such shrinkage would induce the shape changes of the film as its length shortens and wraps the articles. 1,2 Thus, heat shrinkable films are witnessing tremendous application in the packaging industry, including food, drinking, and merchandise packaging. Among several commercial age force is desirable, while maintaining good mechanical performances is also crucial.…”

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confidence: 99%

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Improved heat shrinkage and mechanical performances of polyethylene trilayer blown film prepared via novel multilayer coextrusion method

Luo

Chang

2019

Packag Technol Sci

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In this work, polyethylene (PE) trilayer blown film was prepared using a self‐made rotating coextrusion blown film die (RCBD) with the aim to manufacture trilayer film with excellent comprehensive heat shrinkage and mechanical performances. Polymer resins in this unique blown film die are subjected to a complicated flow field combining both shear circulation and pressure flow. As a result, the melt shows a helix movement in our novel die. The effect of additional parameter (mandrel rotation speed) on the heat shrinkability and mechanical properties of trilayer film was investigated and compared with that of various blow‐up ratios (BURs). The shrinkage rate and shrinkage force along transverse direction (TD) were significantly improved by the mandrel rotation, rather than BUR. Similar trends were observed in tensile strength along TD. However, no considerable changes in heat shrinkability and mechanical properties of PE films along machine direction (MD) were observed. In summary, samples prepared at mandrel rotation speed of 4 rpm were obtained excellent comprehensive performances. Moreover, the morphological investigations confirmed that the formation of high ordered lamellae could be induced by mandrel rotation, and the row structure of oriented lamellae tended to incline to TD under higher rotation speed of mandrel. Besides, the crystal dimension and percent crystallinity were increased because of the mandrel rotation.

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Section: Resultsmentioning

confidence: 99%

Section: Heat Shrinkage Performancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Improved heat shrinkage and mechanical performances of polyethylene trilayer blown film prepared via novel multilayer coextrusion method

Luo

Chang

2019

Packag Technol Sci

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Study of the interfacial adhesive strength of a heat‐shrinkable multilayer film

Nishitsuji

Shinozaki

Miyata

et al. 2021

Polymer Engineering & Sci

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A heat‐shrinkable multilayer film is widely employed as labels of plastic bottles. A new heat‐shrinkable multilayer film without an adhesive layer was designed in this study. The interfacial adhesive strength between the layers was controlled to avoid layer separation. We assumed a polyethylene terephthalate glycol‐modified (PETG)/styrene‐co‐butadiene block copolymer/PETG shrinkable film substitute as the general poly(ethylene terephthalate) (PET)/polystyrene/PET shrinkable film. The interlayer adhesive strength between the layers was retained for industrial utilization even after drawing. Additional polybutadiene (PB) infiltrated the butadiene layer in the microphase‐separated structure. Further addition of PB could not infiltrate the butadiene layer. The excessive PB contents coexisted with the interface between the layers, as observed by transmission electron microscopy (TEM). The segregated PB enhanced the interfacial adhesive strength. We concluded that the selective distribution of adhesive functional materials along the interface could appropriately retain its adhesive strength.

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Nature of molecular network in thermal shrinkage behavior of oriented high‐density polyethylene

Jiang

Enderle

et al. 2013

J Polym Sci B Polym Phys

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Shrinkage and structural evolution of oriented highdensity polyethylene on heating were investigated by a combination of thermomechanical analysis (TMA) and synchrotron small angle X-ray scattering (SAXS) techniques. Under varying load conditions, TMA study was performed to record the continuous length changes as a function of temperature. The value of shrinkage without any load could be evaluated by a linear extrapolation method, which eliminated the influence of the required tension by traditional TMA approach. In addition, the apparent modulus of network was used to describe the nature of entangled molecular network in detail during the shrinkage process. Importantly, it was found that the apparent modulus decreased gradually with increasing temperature. Furthermore, the SAXS data provided a direct evidence for the variation trend of shrinkage stress obtained by the tensile testing stage, and the results confirmed that the shrinkage force mainly originates from interfibrillar networks.

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Thermal behaviors of heat shrinkable poly(vinyl chloride) film

Cited by 16 publications

References 22 publications

Improved heat shrinkage and mechanical performances of polyethylene trilayer blown film prepared via novel multilayer coextrusion method

Improved heat shrinkage and mechanical performances of polyethylene trilayer blown film prepared via novel multilayer coextrusion method

Study of the interfacial adhesive strength of a heat‐shrinkable multilayer film

Nature of molecular network in thermal shrinkage behavior of oriented high‐density polyethylene

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