The Micro Injection Moulding Process for Polymeric Components Manufacturing

Surace, Rossella; Trotta, Gianluca; Bellantone, Vincenzo; Fassi, Irene

doi:10.5772/35299

Cited by 22 publications

(14 citation statements)

References 59 publications

(65 reference statements)

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“…In mIM, the packing pressure can help the filling of micro-cavities in the mold insert to be filled with the polymer more than by applying a higher injection pressure. The holding pressure was considered a critical parameter that affects shrinkage by Wen and Wen and Surace et al [110,125].…”

Section: Processing Parameter Influencesmentioning

confidence: 99%

Review of Factors that Affect Shrinkage of Molded Part in Injection Molding

Annicchiarico¹,

Alcock²

2014

Materials and Manufacturing Processes

122

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Purpose: This paper reviews the factors affecting shrinkage of molded parts in injection molding. Methods: A selective screening of the papers published in the last 10 years was adopted. The review was organized according to molding scale (macro or micro) and by considering four branches of influence: material behaviors, processing parameters, mold, and specimen design. Results: Within the interval of confidence, at the macroscale, critical processing parameters were the temperatures, the packing parameters, cooling time, and injection speed; temperatures and packing parameters resulted critical factors at the microscale as well. Concerning the design aspects, the runner size and the ribs affect shrinkage at the macro and microscale, respectively. The analysis of the literature review has shown an absence of statistical approach for determining the material influences, a lack of information on shrinkage occur in powder-molded parts and the absence of data in specimen with dimensions below 10 m. Conclusions: The review collected the factors that affect shrinkage in injection molding, and identified three possible areas for further works.

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Section: Processing Parameter Influencesmentioning

confidence: 99%

Review of Factors that Affect Shrinkage of Molded Part in Injection Molding

Annicchiarico¹,

Alcock²

2014

Materials and Manufacturing Processes

122

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“…Injection molding and bonding used in the fabrication of microneedle units were expected to increase freedom in the design of the shape . First, each microneedle in the main element was provided with an arrowhead‐shaped part at the delivery end.…”

Section: Discussionmentioning

confidence: 99%

Enhanced immunity in intradermal vaccination by novel hollow microneedles

Ogai¹,

Nonaka²,

Toda³

et al. 2018

Skin Research and Technology

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“…Thirdly, surface tension resulting from unbalanced forces of the molecules at the material surface may have an influence on the microscale flow . Lastly, microscale elasticity, variable heat transfer coefficients, and compressibility effects exist in µIM and is different from conventional IM, which needs to be included in any computer simulation analysis in order to obtain a more accurate prediction for flow behavior within microfeatures.…”

Section: Simulation Of Variable Heat Transfermentioning

confidence: 99%

The use of variotherm systems for microinjection molding

Zhang

Gilchrist

2015

J of Applied Polymer Sci

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Microinjection molding (lIM) is a fast-developing technology which is used to produce polymeric microcomponents or components with micro/nanoscale features, such as are used in many fields including microfluidic diagnostics, microneedle drug delivery devices, microgears, and microswitches. The capabilities and performance of the microinjection molding process can be improved by incorporating a variotherm system. This leads to improved component quality, especially for high aspect ratio features. It can also help to increase the polymer flow path, improve feature replication, reduce residual stresses and molecular orientations, and also can eliminate weld lines. This article reviews the use of different variotherm systems in lIM, and describes how simulation of its use can provide insight when designing a mold cavity or a component with challenging microfeatures. The article highlights important problems, challenges and areas for further research. An increased understanding of these issues will provide opportunities to enhance further developments in the lIM process.

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The Micro Injection Moulding Process for Polymeric Components Manufacturing

Cited by 22 publications

References 59 publications

Review of Factors that Affect Shrinkage of Molded Part in Injection Molding

Review of Factors that Affect Shrinkage of Molded Part in Injection Molding

Enhanced immunity in intradermal vaccination by novel hollow microneedles

The use of variotherm systems for microinjection molding

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