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Post-processing in multi-material 3D printing

Brancewicz-Steinmetz E., Sawicki J.

Journal of Achievements in Materials and Manufacturing Engineering

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2023

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Vol. 117, nr 1

5--14

EN

Purpose: This study aims to investigate the adhesion of combining two materials with different properties (PLA-TPU and TPU-PLA) printed in FFF (fused filament fabrication) with post-processing treatments. Design/methodology/approach: The scope of the study includes making variants of samples and subjecting them to three different post-printing treatments. After processes, shear tests were conducted to determine the adhesion. Findings: The post-printing treatment results in a stronger inter-material bond and increased adhesion strength; the best average shear strength results were achieved for annealing without acetone and for PLA/TPU samples for treatment in cold acetone vapour. Research limitations/implications: In the study, adhesion was considered in the circular pattern of surface development. Practical implications: Reinforcement of the biopolymer broadens the possibilities of using polylactide. Examples of applications include personalised printing items, where the elastomer will strengthen the polylactide. Originality/value: These studies aim to promote the use and expand the possibilities of using PLA biopolymer. The strength properties of printouts from different materials are often insufficient, hence the proposal to use post-printing processing.

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Prototyping of an Individualized Multi-Material Wrist Orthosis Using Fused Deposition Modelling

Górski Filip, Kuczko Wiesław, Weiss Weronika, Wichniarek Radosław, Żukowska Magdalena

Advances in Science and Technology. Research Journal

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2019

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Vol. 13, no 4

39--47

EN

The paper presents the design and manufacturing process of an individualized wrist orthosis. The patient’s upper limb was 3D scanned and the orthosis was designed using a CAD system. Each part of the orthosis consists of two different materials that fulfill different functions. By using the double-head Fused Deposition Modelling machine it was possible to produce these parts in a single process without the need for additional assembly operations. The orthosis has been tested for mutual fit of parts, strength and comfort of use.

3

Thermoplastic fibre metal laminates: Stiffness properties and forming behaviour by means of deep drawing

Wollmann T., Hahn M., Wiedemann S., Zeiser A., Jaschinski J., Modler N., Ben Khalifa N., Meißen F., Paul C.

Archives of Civil and Mechanical Engineering

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2018

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Vol. 18, no. 2

442--450

EN

Hybrid materials provide a high potential for lighter structures and an improved crash performance. The investigated hybrid sandwich laminate consists of steel cover sheets and a carbon fibre-reinforced thermoplastic core. The first part of this investigation is focusing on an analytical prediction as well as on a comparison of numerical and experimental results for the evaluation of the laminate properties to get a general understanding for the material. Within the second part the forming behaviour of this material is investigated experimentally, analytically and numerically by means of cup deep drawing. These results indicate that cup deep drawing of thermoplastic fibre metal laminates is possible but limited. The limits in terms of achievable drawing depths are found to be defined by cracking and wrinkling of the cover sheets as well as fibre failure in the composite material.

4

Recykling odpadów wielomateriałowych

Tartakowski Z., Burzyński M., Mydłowska K.

Przetwórstwo Tworzyw

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2017

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T. 23, Nr 5 (179)

450--457

PL

Powstające odpady z produkcji wyrobów o wielomateriałowym składzie poddano procesowi rozdrabniania z jednoczesnym rozdziałem poszczególnych składników. Przeprowadzono badania nad wpływem parametrów procesu rozdrabniania a jakością uzyskanych materiałów. Analizowano wielkość rozdrobnionych materiałów, stopień rozdzielenia poszczególnych składników oraz procesy termiczne zachodzące podczas rozdrabniania. Zbadano właściwości przetwórcze wybranych frakcji PP o różnym stopniu zanieczyszczenia PU. Wykazano, że przy odpowiednim doborze parametrów procesu można uzyskać materiały o korzystnym stopniu rozdrobnienia i rozdzielenia.

EN

The resulting waste from the production of multi-material compositions was subjected to a process of comminution with simultaneous separation of the individual components. Research on the influence of the parameters of the grinding process and the quality of the obtained materials was conducted. The size of the comminuted materials, the degree of separation of the individual components and the thermal processes occurring during the comminution were analyzed. The processing properties of selected PP fractions with different degrees of PU pollution were investigated. It has been shown that materials with an advantageous degree of fineness and separation can be obtained with appropriate selection of process parameters.