Effect of processing conditions on shrinkage and warpage and morphology of injection moulded parts using microcellular injection moulding

Kramschuster, Adam; Cavitt, Ryan; Ermer, D. S.; Chen, Z. B.; Turng, Lih‐Sheng

doi:10.1179/174328906x128199

Cited by 29 publications

(23 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Studies that adopted Taguchi approach [10,50,55,63,64] or different methods [49,53,58,59,[65][66][67][68] identified this parameter as strongly critical. Shrinkage starts as soon as melted polymer fills the cavity mold and was critically influenced by holding pressure [33,69].…”

Section: Processing Parameter Influencesmentioning

confidence: 99%

“…Different approaches (numerical simulation [54], Taguchi methods [55][56][57] coupled with hybrid optimization [50], DoE [53,58,59]) and consequent experimental validations, identified the packing time as a critical factor. According to Yadav, Dravid, and Rajput [60], this factor resulted critical for amorphous (ABS) but not for semicrystalline polymer (PP).…”

Section: Processing Parameter Influencesmentioning

confidence: 99%

See 1 more Smart Citation

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

Annicchiarico¹,

Alcock²

2014

Materials and Manufacturing Processes

122

View full text Add to dashboard Cite

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.

show abstract

Section: Processing Parameter Influencesmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…This is both costly and time consuming. Therefore, design of experiments (DOE) is usually adopted to schedule the injection experiment [37,38]. DOE commonly uses the method invented by Taguchi [39].…”

Section: Introductionmentioning

confidence: 99%

Taguchi analysis of shrinkage and warpage of injection-moulded polypropylene/multiwall carbon nanotubes nanocomposites

Prashantha¹,

Soulestin²,

Lacrampe³

et al. 2009

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. This paper focuses on the effect of multi-walled carbon nanotube (MWNT) addition on shrinkage and warpage properties of polypropylene (PP) injection mouldings before and after annealing. A Taguchi design of experiments has been implemented to highlight the influence and optimise processing conditions such as injection flow rate, holding pressure, back pressure and screw speed. The addition of 2 wt% of carbon nanotubes into PP significantly reduces the shrinkage and warpage of injection-moulded parts as compared to the neat PP. Skrinkage reduction up to 48% (respectively 33%) is noticed in the flow direction before (respectively after) annealing, whereas warpage reduction exceeds 55%. The sensitivity of the injection-mouldings dimensional properties to processing parameters remains roughly the same in case of neat PP and PP/MWNT nanocomposites when shrinkage is considered. It is even significantly reduced by carbon nanotubes addition when warpage is considered. Furthermore, the Taguchi method provides an efficient and effective tool to study the effects of process parameters on the warpage and shrinkage of injection moulded parts. The additive model used works well for predicting the warpage and shrinkage behaviour of PP and PP/MWNT composites.

show abstract

“…Micro cells also greatly enhance the part toughness of many polymeric materials by acting as crack arrestors. Substantial research and development have been conducted on the processing and characterization of many different microcellular and filled plastics [2,[6][7][8][9][10][11][12][13][14][15]. However, the problems of microcellular surface reports and study are still insufficient.…”

Section: Introductionmentioning

confidence: 99%