Analyse und Berechnung der Str�mungsvorg�nge im zylindrischen Scherspalt von Plastifizieraggregaten

Potente, H.; Fornefeld, A.; Michel, P.; Wittemeier, R.

doi:10.1007/bf01331977

Cited by 7 publications

(4 citation statements)

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“…The oscillating movement of the joining partner relative to each other with a defined joining pressure is characteristic for vibration welding. Fundamental investigations [1][2][3][4] into linear vibration welding show that the meltdown over time exhibits a characteristic course regardless of the material, component geometry, or parameter choice. This characteristic course can be divided into four stages: solid friction, unsteady melt formation, quasi-steady melt flow, and cooling (Fig.…”

Section: Vibration Welding Thermoplasticsmentioning

confidence: 99%

Influence of radiation cross‐linking of polyamide 66 on the characteristics of the vibration welding process

Leisen

Menacher

Drummer

2015

Polymer Engineering & Sci

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The conventional vibration welding process of polyamide 66 only has a continuous and steady melt flow during the quasi‐steady phase. The process and resulting welds have been thoroughly investigated. Radiation cross‐linking of polyamide 66 with electron beams alters the material's characteristics. Consequently, the resulting energy balance during vibration welding changes and the squeeze flow is impeded. Additionally, this causes the cross‐linking to attain a residual stiffness above the crystallite melting temperature, thereby influencing the characteristics of the vibration welding process. Further, higher weld temperatures and a change in meltdown behavior can be observed. This leads to a varied relationship amongst the process, structure, and properties for vibration welding cross‐linked polyamide. Hence, weld strengths up to the value of the base material strength are possible. The scope of this article is to investigate the influence of radiation cross‐linking on the material characteristics and, by extension, the resulting processing and welding characteristics. Calorimetric, chemical, rheological, mechanical, and optical investigations serve to highlight the influence of radiation cross‐linking on the vibration welding process of polyamide 66. POLYM. ENG. SCI., 55:2493–2499, 2015. © 2015 Society of Plastics Engineers

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Section: Vibration Welding Thermoplasticsmentioning

confidence: 99%

Influence of radiation cross‐linking of polyamide 66 on the characteristics of the vibration welding process

Leisen

Menacher

Drummer

2015

Polymer Engineering & Sci

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“…The structure-property relationships of vibration welded semicrystalline polymers, especially in case of isotactic polypropylene (iPP), have been studied comprehensively [2][3][4][5][6][7][8][9]. It was established that the morphology of the weld joint (seam) reflects very sensitively the conditions of the welding process (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Note that the above parameters control the thermal and flow behaviours of the molten zone in the welding joint. The welding process was split in four phases by Potente et al [2]: 1 -friction in the solid phase, 2 -onset of an instationary melt, 3 -appearance of a quasi-stationary melt, and 4 -cooling. These four phases are displayed in Figure 2, which shows the variation of the penetration (s) and vibration amplitude (a) as a function of the welding time.…”

Section: Introductionmentioning

confidence: 99%

Vibration welding of alpha and beta isotactic polypropylenes: Mechanical properties and structure

Varga¹,

Ehrenstein²,

Schlarb³

2008

Express Polym. Lett.

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Abstract. Propylene homo-and copolymers (both random and block types) with and without beta nucleation were injection moulded and the related plaques joined by linear vibration welding. The melt flow index (MFI) of the polypropylenes was different. During vibration welding the pressure has been varied (0.5, 2 and 8 MPa). The properties of the welded plaques were determined under both static (tensile) and dynamic conditions (Charpy impact). It was found that the mechanical performance of the welds could strongly be improved when beta nucleated PP plaques were combined with each other. In other combinations the 'weaker' alpha modification controls the mechanical response. The supermolecular structure of the weld was assessed by polarised light microscopy using thin microtomed sections. Formations of the weld morphology along with its effects on the mechanical performance were discussed.

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“…constant Ci is a function of the size of the dimensionless pressure gradient and the power law exponent n. Making allowance for boundary condition(8), the integration of Eqn. (10) yields the following: cases, an iteration must be performed.…”

mentioning

confidence: 99%

Establishment of the Shear Stresses Acting on the Solid Bed Surrounded by Flowing Melt

Potente¹,

Jungemann²

1996

Journal of Polymer Engineering

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On single-screw extruders, a solid bed break-up can produce a pulsating melt output and poor melt homogeneity on account of isolated, non-melted particles wandering around in the melt. The break-up of the bed is caused by excessive forces acting on the compacted solid bed. To calculate these forces, it is necessary to have knowledge, not only of the pressure distribution around the compacted solid, but also of the shear stresses acting on the solid bed. This article presents a means of calculating these shear stresses.

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Analyse und Berechnung der Str�mungsvorg�nge im zylindrischen Scherspalt von Plastifizieraggregaten

Cited by 7 publications

References 0 publications

Influence of radiation cross‐linking of polyamide 66 on the characteristics of the vibration welding process

Influence of radiation cross‐linking of polyamide 66 on the characteristics of the vibration welding process

Vibration welding of alpha and beta isotactic polypropylenes: Mechanical properties and structure

Establishment of the Shear Stresses Acting on the Solid Bed Surrounded by Flowing Melt

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