Studies on High Density Polyethylene in the Far-field Region in Ultrasonic Welding of Plastics

Roopa, R; Prakasan, K.; Rudramoorthy, R.

doi:10.1080/03602550802188649

Cited by 14 publications

(10 citation statements)

References 4 publications

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“…Comparison of polyethylene low‐density with a Young's modulus of about 400 MPa and polyethylene high‐density with a Young's modulus of about 1200 MPa showed that nearly the same temperature level was reached for both materials in a defined sealing time under the same process conditions. For intermolecular friction, the heat generation rate

\overset{Q}{true}

within viscoelastic materials due to sinusoidal oscillating deformation can be described by the following expression, according to:

\dot{Q} = π \cdot f \cdot ε_{´ 0}^{2} \cdot E^{″}

where f is the frequency of the oscillating tool, E″ is the loss modulus of the material and ε 0 is the strain amplitude. For ultrasonic sealing, this means that greater welding forces and bigger amplitudes lead to more intensive heat generation.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Sealing of Flexible Packaging Films – Principle and Characteristics of an Alternative Sealing Method

2011

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The closure process for packaging is a key process. It ensures the protective function of packaging and assures the packaged goods a long life. In this context, efficient and reliable sealing processes are essential for the production of sustainable packages.In this paper, several characteristics of the ultrasonic sealing process will be discussed and accompanied by experimental results. The introduction provides an insight into the ultrasonic sealing process, its heating mechanisms and the process steps. A comparison is made with conduction sealing. Furthermore, basic principles of heating and energy dissipation are related to the influences of the sealing parameters on the seam strength. The experimental studies were carried out on typical packaging films, such as polyamide-polyethylene laminates. The seam strength in ultrasonic sealing is compared with that in conductive sealing. A lower seam strength was found for ultrasonic sealing in all the tested films. Furthermore, the sealing behaviour of the packaging films contaminated with different kinds of foods was analysed for both sealing methods. Although the ultrasonic sealing method has marginal advantages for bulk materials such as wheat flour, conduction sealing was shown to be better for other products. A comparison of the energy consumption during the ultrasonic and conduction sealing verified the advantages of ultrasonic sealing. In particular for thick packaging films, the amount of energy required for bonding is significantly lower than for conduction sealing.In summary, this paper provides a survey of the characteristics of the ultrasonic sealing method in packaging applicationsits advantages and limitations.

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\overset{Q}{true}

within viscoelastic materials due to sinusoidal oscillating deformation can be described by the following expression, according to:

\dot{Q} = π \cdot f \cdot ε_{´ 0}^{2} \cdot E^{″}

Section: Introductionmentioning

confidence: 99%

Ultrasonic Sealing of Flexible Packaging Films – Principle and Characteristics of an Alternative Sealing Method

2011

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“…This is mechanically accomplished through an ultrasonic horn that focuses the ultrasonic wave energy to the desired spot. Being able to focus the wave also gives manufacturers the ability to design ultrasonic horns that have words, trademarks, patent numbers, or similar functions that allows the companies to differentiate their products 19,20 …”

Section: Heat‐sealing Process and Different Heat‐sealing Methodsmentioning

confidence: 99%

“…Being able to focus the wave also gives manufacturers the ability to design ultrasonic horns that have words, trademarks, patent numbers, or similar functions that allows the companies to differentiate their products. 19,20 Induction current sealing is based on an AC current being passed through a metallic layer, utilizing the magnetic field properties of the metal. When the AC current passes through the metallic material, it reverses the magnetic field back and forth, creating heat.…”

Section: Introductionmentioning

confidence: 99%

Heat‐sealing integrity assessment through nondestructive evaluation techniques

et al. 2022

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Sealing is a critical step in different packaging industries. In heat sealing as one of the major types of sealing processes, two layers of materials (typically thermoplastics) are joined together through the application of heat and pressure load for a certain sealing time. Due to the capabilities of the heat‐sealing process to seal different kinds and sizes of packages, it has a wide range of applications in many different industries such as the packaging of food and medical products. The quality and integrity of sealings produced by these techniques are crucial for the quality and safety of the contained materials. In this paper, different types and processes of sealing are discussed. Due to the variations in shape, size, and complexity of the sealing region, quality testing and inspection of these products is a challenging task. Nondestructive testing and evaluation (NDTE) techniques can be promising tools to overcome these challenges. Furthermore, a detailed study of various types of potential defects and their generation mechanism in heat sealing is presented. Then, various types of NDTE techniques that can be potentially used for the inspection of heat‐sealing regions and their working principles, as well as their strength and weakness in sealing inspection, are debated. Finally, several cases of sealing inspection and relevant NDTE techniques that are developed as standard procedures are presented. The discussions in this study provide useful information for the selection and implementation of appropriate quality inspection and inline quality monitoring of sealing parts and processes.

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“…Roopa Rani et al [1] studied the far field welding of semi crystalline polymer using finite element analysis.…”

Section: Fig 1 Schematic Representation Of Ultrasonic Insertion Processmentioning

confidence: 99%

Design and Optimization of Slotted Block Horn Utilized in Ultrasonic Insertion Process Through Rsm-fea-ga Integration Technique

Kumarasamy¹,

Sooriyamoorthy²

2021

Preprint

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This paper investigates design and optimization of slotted block horn used in ultrasonic insertion process by integrating response surface methodology (RSM), finite element analysis (FEA) and genetic algorithm (GA). Performance and reliability of block horn depend on the uniformity of displacement amplitude developed at the output face of horn. Amplitude uniformity of horn can be improved by optimizing the design of block horn. Modal and harmonic analyses are carried out as per design matrix obtained from RSM, and then non-linear model for displacement amplitude is developed. Design optimization of block horn is performed by coupling the non-linear model with GA as fitness function. Thermal analysis is carried out to validate optimized dimensions of block horn theoretically by predicting the temperature at joint. Slotted block horn is fabricated with optimum geometry using Aluminium alloy (AA6351) and the design is validated experimentally by measuring the temperature at joint using thermocouple and Data Acquisition System (DAQ). Results of this study show that the temperature predicted from thermal analysis correlates well with temperature measured from experiments and the design of slotted block horn is validated.

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Studies on High Density Polyethylene in the Far-field Region in Ultrasonic Welding of Plastics

Cited by 14 publications

References 4 publications

Ultrasonic Sealing of Flexible Packaging Films – Principle and Characteristics of an Alternative Sealing Method

Ultrasonic Sealing of Flexible Packaging Films – Principle and Characteristics of an Alternative Sealing Method

Heat‐sealing integrity assessment through nondestructive evaluation techniques

Design and Optimization of Slotted Block Horn Utilized in Ultrasonic Insertion Process Through Rsm-fea-ga Integration Technique

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