Citation: Yan-bo Zhu, Miao Du, Chao-hua Lu, Jun Yin, Qiang Zheng. Influence of 3D Printing Parameters on the Interlayer Bonding Strength for TPU Soft Materials[J]. Acta Polymerica Sinica, ;2018, (4): 532-540. doi: 10.11777/j.issn1000-3304.2017.17146 shu

Influence of 3D Printing Parameters on the Interlayer Bonding Strength for TPU Soft Materials

Yan-bo Zhu ² ,
Miao Du ^1,2,, ,
Chao-hua Lu ³ ,
Jun Yin ³ ,
Qiang Zheng ^1,2

1.
Key Laboratory of Macromolecule Synthesis and Functionalization, Ministry of Education, Zhejiang University, Hangzhou 310027
2.
Department of Polymer Science and Engineering, Zhejiang University, Zhejiang University, Hangzhou 310027
3.
Department of Mechanical Engineering, Zhejiang University, Hangzhou 310027

Corresponding author: Miao Du, dumiao@zju.edu.cn
Received Date: 1 June 2017

By using the improved 3D printer based on the fused deposition method (FDM), thermoplastic polyurethane (TPU) elastomer soft materials were printed into stereoscopic objects. The conventional 3D printer in a FDM mode was improved for soft materials TPU. That is, the distance between the pulling wheels and heated nozzle was shortened and a polytetrafluoroethylene pipe was added to avoid the bending of the soft linear feedstock during 3D printing process. Influence of 3D printing parameter on the appearance and interlayer bonding strength of the printed products were explored. TPU with appropriate content of hard and soft segments could be used for 3D printing. In terms of printing parameter, the layer space has great influence on the appearance of the printed product. When the layer space is set too large, the bonding area will be smaller and the product prone to deform at the corner. If the layer space is set too small, the printing soft line will squeeze each other and cause the printed product deformation and the hollow structure is hard to put up. A novel model for tensile test was designed to characterize the interlayer bonding strength of the printed products. The models, which are divided into two parts during 3D printing process, are bonded to each other layer by layer. The interlayer bonding strength of the 3D printed products with TPU soft materials can catch 70% of that of the samples prepared by mould pressing, and only 48% for that of stiff printing materials. Both the layer space and platform temperature have significant impact on the interlayer bonding strength of the printed product. High platform temperature and low layer space could strengthen the interlayer bonding. The printing speed and printing temperature have little influence on the interlayer bonding strength. The outer contour error of the geometrical shape printed by TPU soft materials is within 1.65% only. Furthermore, the objects printed using TPU soft materials have great resilience and are also easy to bend.
- 3D Printing,
- Fused deposition method (FDM),
- Thermoplastic polyurethane (TPU) soft materials,
- Interlayer bonding strength
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