Joining of Incompatible Polymer Combinations by Form Fit Using the Vibration Welding Process

Wolf, Michael; Kleffel, Tobias; Leisen, Christoph; Drummer, Dietmar

doi:10.1155/2017/6809469

Cited by 14 publications

(8 citation statements)

References 9 publications

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“…Furthermore, an explanation of the interactions between the filling behavior of the structures and the thermomechanical properties of the bonding-partner can be accomplished. In contrast to previous investigations [25] on lap joints of PA66-HDPE, the butt joints have a uniaxial tensile load without any torsion that acts directly in pin direction. Due to this uniaxial load and the avoidance of any torsion, an assessment of the transmitted forces due to the form-fit can be conducted.…”

Section: Rotational Rheometrymentioning

confidence: 65%

“…Therefore, investigations of dissimilar material combinations, especially in the area of polymermetal combinations [20][21][22][23][24], have shown a high potential for joints based on or provided by form-fits in a two-stage process with pre-structuring the metal part. Furthermore, initial investigations [25] into formfit polymer-polymer combinations demonstrated the feasibility and potential of mechanical adhesion in welding for expanding the material combination spectrum. Hereby, functional lap joints, which can transmit and endure measurable loads, could be produced for the adhesion incompatible combinations of polypropylene with polyamide.…”

Section: Two-stage Joining Processes With Structuring One Joining Parmentioning

confidence: 99%

“…Otherwise, a destruction of the existing pins and undercuts may arise. After a defined joining depth or time, the friction movement stops, the molten polymer solidifies under pressure and a form-fit connection is generated [25]. Initial experiments have been able to demonstrate the high potential of form-fit connections between adhesion incompatible semi-crystalline thermoplastics produced in welding.…”

Section: Two-stage Joining Processes With Structuring One Joining Parmentioning

confidence: 99%

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Influence of the thermomechanical properties on the joining of adhesion incompatible polymers by form-fit using the vibration welding process

Wolf¹,

Hertle²,

Drummer³

2019

Express Polym. Lett.

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In the product manufacturing cycle, the joining of polymers often takes a central position. Vibration welding is characterized by short cycle times, high process flexibility and stability as well as by the achievement of high bond strengths without using additives. However, the vibration welding process is clearly restricted by a necessary adhesion compatibility of the joining partners. By means of structuring one joining partner and subsequent filling of the structures by a second joining partner, the joining by form-fit using vibration welding enables the combination of adhesion incompatible polymers. Within these investigations, bonds between adhesion incompatible semi-crystalline thermoplastics were generated based on mechanical adhesion. Also semi-crystalline and amorphous polymers could be connected for the first time without any connecting elements, although they conventionally do not show mechanical resilience. The analysis of the thermomechanical material properties and the resulting multimaterial link enabled the determination of first influences on the resulting formfit connection caused by the occurring joining zone temperature.

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Section: Rotational Rheometrymentioning

confidence: 65%

Section: Two-stage Joining Processes With Structuring One Joining Parmentioning

confidence: 99%

Section: Two-stage Joining Processes With Structuring One Joining Parmentioning

confidence: 99%

See 1 more Smart Citation

Influence of the thermomechanical properties on the joining of adhesion incompatible polymers by form-fit using the vibration welding process

Wolf¹,

Hertle²,

Drummer³

2019

Express Polym. Lett.

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show abstract

“…To avoid a deformation of the existing pin structures during the joining step, the bonding-partner should be flowable in a temperature range in which the structure-partner does not melt. In the case of PA66 as a structured-partner, this could be achieved in previous investigations using, for example, PE, PP, or PMMA as a bonding-partner [13,16]. A detailed description of the form-fit joining process using pin-like structures is shown in earlier investigations [16].…”

Section: Joining By Use Of Pin-like Structuresmentioning

confidence: 89%

Separation of Multi-Material Polymer Combinations Produced by Joining Using Pin-like Structures

Wolf

Drummer

2022

JMMP

Self Cite

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In industrial applications, multi-material joints are becoming increasingly important to achieve a sustainable and resource-saving production. Not only high mechanical properties during the component use have to be given, but also possibilities to separate the joint after end of life are crucial. The recycling and re-use of the materials plays an increasing role in the process chain. Conventional multi-material joints can be separated by cutting out the joining zone, solvents, or thermal degradation. However, these methods result in a loss of material, damage to the base material, or high energy consumption. Therefore, novel joining methods are desirable, such as the joining using pin-like structures. The potential of this novel method for joining adhesion incompatible materials has been demonstrated in previous studies. This paper studies the separability of these connections. Therefore, joints between polyamide 66 (PA66) and polypropylene (PP) as well as PA66 and polymethylmethacrylate (PMMA) are investigated by means of thermal separation and shredding with subsequent sorting using the density difference of the materials. The separated components were investigated by analytical methods (including dissolution tests, viscosity number analysis, and Fourier-transform infrared spectroscopy) with respect to varietal purity and possible degradation effects. It could be shown that shredding allows a complete separation of the multi-material joint into its individual components without material residues or material loss. For thermal separation, material residues of PP or PMMA could be detected in the pin gaps of the PA66. For both separation methods, an influence on the base materials due to degradation effects could be excluded. It can be stated that joining using pin-like structures in vibration welding technology offers a sustainable production of multi-material joints with high recyclability.

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“…Plastic-plastic composites of mutually incompatible plastics are also the subject of research. Thus Wolf et al [12] showed for the incompatible material combination PA66 and PE-HD that a bond is possible if the surface of the polyamide is pretreated accordingly. For this purpose, a surface structure is introduced into the plastic component with the higher melting point (PA66) by vibration.…”

Section: Pretreatment For Hybrid Bondsmentioning

confidence: 99%

Influence of the laser-based surface modification on the bond strength for friction press joining of aluminum and polyethylene

Meyer¹,

Wunderling²,

Zaeh³

2019

Prod. Eng. Res. Devel.

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Friction press joining is an innovative joining process for the production of plastic-metal joints without additives, in an overlap configuration. In order to achieve a high bond strength, the metallic joining partner is pretreated with laser radiation. Subsequently, heat is induced by friction and pressure during the joining process, causing the thermoplastic material to melt and adhere to the metallic joining partner. In this work, the temperature distribution during the process in the composite is analyzed and characterized. It was found that the occurring temperatures and temperature differences are not only dependent on the rotational speed, but also on the feed rate. It is also shown that the friction surface temperature can be used as an indirect control variable for a model-based, closed-loop control. Based on these findings, various surface modifications for the metallic joining partner were investigated and analyzed with regard to the maximum strength of the joint. It was observed that the highest tensile shear strength can be achieved with a quasi-chaotic nano structure. In addition, the joining compound was characterized by a thin section, facilitating the identification of specific zones in the joint. These investigations show the high potential for friction press joining of plastics and metals, and form the basis for a model-based control of the joining zone temperature.

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Joining of Incompatible Polymer Combinations by Form Fit Using the Vibration Welding Process

Cited by 14 publications

References 9 publications

Influence of the thermomechanical properties on the joining of adhesion incompatible polymers by form-fit using the vibration welding process

Influence of the thermomechanical properties on the joining of adhesion incompatible polymers by form-fit using the vibration welding process

Separation of Multi-Material Polymer Combinations Produced by Joining Using Pin-like Structures

Influence of the laser-based surface modification on the bond strength for friction press joining of aluminum and polyethylene

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