Laser Welding of Polymer Foils with Gold Nanoparticles as Optical Absorber

Neuber, Matthias; Heilmann, Andreas

doi:10.1166/asl.2011.1993

Cited by 5 publications

(2 citation statements)

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“…Nanoparticles are of fundamental importance for the welding of two polymeric sheets for their capability to absorb the laser light and to transmit their energy to the entire sheet in which are embedded. In previous studies other nanofillers have been used to enhance the optical properties of polyethyelene, like carbon nanotubes [6,7], carbon nanofiller [8,9], iron oxide [10], titanium oxide [11,12], gold [13], silver [14]. Among the great variety of metallic nanoparticles, silver nanoparticles have advantages connected to their physical, chemical and biological properties [15], such as the high electrical and thermal conductivity, the good stability in environmental conditions, the non toxicity and high chemically stability, and the broad spectrum of bactericidal and fungicidal activity [16].…”

Section: Introductionmentioning

confidence: 99%

Laser welding of polymeric nanocomposites filled with silver nanoparticles produced by laser ablation

Scolaro¹,

Visco²,

Torrisi³

2020

J. Inst.

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A: Ultra High Molecular Weight Poly Ethylene (UHMWPE) is a polymer with high performance features. It is typically transparent to the IR laser irradiation because of intrinsic structure. Thus, it needs of an adsorbent material, homogeneously distributed within it to generate absorbent bands in the IR regions. Silver nanoparticles, produced by laser ablation, can be added in different amount (1-6 weight %). These resulting nanocomposites have been prepared by a chemical mixing in an ultra-sonication bath. Sheets of nanocomposite plastic, prepared by a thermoforming process, were then sealed by means of a diode laser operating at 970 nm wavelength in continuum, with a maximum energy of 100 mJ and for a time of 60 seconds. Optical absorption features of the materials and the mechanical strength evaluation of the welded joints have been checked and discussed.

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Section: Introductionmentioning

confidence: 99%

Laser welding of polymeric nanocomposites filled with silver nanoparticles produced by laser ablation

Scolaro¹,

Visco²,

Torrisi³

2020

J. Inst.

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“…Any new development for Laser welding technology has to rank its results comparing to the thermal welding. Mechanical testing of welding seams made by thermal welding and Laser welding [7,8] was performed on strip samples by using a universal testing machine (Zwick Z050). Figure 6 gives the tensile strength and the fracture strain for a usual thermal welding seam and six Laser welding seams performed with different compositions of the absorber ink, because a number of absorber inks were used to find the right absorber ink, the right deposition parameters and the right thickness of the absorber layer to get good welding results.…”

Section: Mechanical Testing Of Laser Welding Seamsmentioning

confidence: 99%

Precise Absorbent ink Deposition and Optical Inspection System

et al. 2011

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Foils from the ethylene-tetrafluoroethylene (ETFE) copolymer are used as transparent, humidity resistant and UV-stabile facade and roof coverings, e.g. for stadia, indoor swimming pools or greenhouses [1]. With pneumatically supported cushions, large translucent structures can be realized. Until now, they are assembled through a thermal welding process [2]. The development of welding techniques using laser irradiation is under way.Laser welding of transparent polymer foils requires an optical absorber placed in the interface between the two welding pairs. Usually, dye molecules with absorption properties adapted to the laser wavelength are used as absorbers. At a well-defined temperature, the dye molecules will be chemically modified, and transparent laser welding seams can be achieved. To get reproducible laser welding results, a homogenous layer of absorbent molecules or materials at the welding interface have to be realized, which is often very hard to achieve by wet deposition of dye molecules dispersed in a solution.In our contribution, we report on an inkjet printing system that can be mounted on a R2R manufacturing setup. The main challenge to this approach is to find the right ink that is compatible with this highly hydrophobic ETFE foil. Therefore, both the pretreatment of the substrate as well as the utilization of different inkjet technologies are dealt with in this contribution. It is demonstrated that the inkjet printing of a laser absorbent ink in a defined way onto the substrate is possible.For quality assurance, an optical inspection system has been developed to ensure a proper deposition of material. This ensures the quality control for the inkjet printing process of the special functional material. In that part the results of the comparison of the use of a dedicated 14-bit grey level CCD line camera is compared to a high quality webcam.Laser irradiation of the foil with printed laser absorbent lines together with the untreated joining partner was performed by a continuous wave diode laser at a wavelength of 808 nm using a defocused laser spot. A nearly transparent welding seam was achieved. Mechanical tensile tests of the laser welding seams have demonstrated that their tensile strength is comparable to conventional thermal welding seams. 1531

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Laser transmission welding of polymers – A review on process fundamentals, material attributes, weldability, and welding techniques

Acherjee

2020

Journal of Manufacturing Processes

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Laser Welding of Polymer Foils with Gold Nanoparticles as Optical Absorber

Cited by 5 publications

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Laser welding of polymeric nanocomposites filled with silver nanoparticles produced by laser ablation

Laser welding of polymeric nanocomposites filled with silver nanoparticles produced by laser ablation

Precise Absorbent ink Deposition and Optical Inspection System

Laser transmission welding of polymers – A review on process fundamentals, material attributes, weldability, and welding techniques

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