Back melt flow in injection–compression molding: Effect on part thickness distribution

Guan, Wenxian; Huang, Hanxiong

doi:10.1016/j.icheatmasstransfer.2012.04.012

Cited by 15 publications

(13 citation statements)

References 14 publications

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“…An interesting effect of melt temperature was reported by Guan and Huang [88] that described the relationship between melt temperature and melt flow within the cavity cross through the gate. Outcomes have shown that this parameter influenced the amount of material inside the cavity mold and consequently shrinkage because under a more pronounced amount of melt flow, the area near the gate can receive much material for compensating part shrinkage caused by material cooling.…”

Section: Processing Parameter Influencesmentioning

confidence: 86%

“…Concerning different kind of polymers as semicrystalline (HDPE [54,87], PS [72,88], PP [49,52,60,71]), polymer wax [61], amorphous (ABS [60], PVC [56]), or ceramic-based feedstock (W [62], Si 3 N 4 [22]), experimental results demonstrated that shrinkage was critically influenced by melt temperature.…”

Section: Processing Parameter Influencesmentioning

confidence: 99%

“…In the papers that considered the influence of processing parameters in terms of molding shrinkage at the macroscale, it was possible to learn also general indications about other aspects: compression factors [88,90,91], appropriate mold design [92][93][94][95] and suitable processing conditions [64,94,96,97] can reduce and compensate shrinkage.…”

Section: Processing Parameter Influencesmentioning

confidence: 99%

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

Annicchiarico¹,

Alcock²

2014

Materials and Manufacturing Processes

123

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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: 86%

Section: Processing Parameter Influencesmentioning

confidence: 99%

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

123

View full text Add to dashboard Cite

show abstract

“…Despite the advantages associated with ICM, its process control is more critical and difficult since additional compression-related processing parameters are involved. The role of processing parameters playing in the part quality, which have been investigated experimentally [11,12,[15][16][17][18] or numerically [10,11,14] in a wide range, is demonstrated to be significant. Moreover, in the complex process of ICM, the obvious changes in process variables (especially cavity pressure) can distinctly influence and also reflect the part quality.…”

Section: Introductionmentioning

confidence: 99%

A Proposed Technique to Acquire Cavity Pressure Using a Surface Strain Sensor During Injection-Compression Molding

Guan¹,

Huang

2013

Journal of Manufacturing Science and Engineering

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A new technique was proposed and experimentally verified for the cavity pressure acquisition in the injection-compression molding (ICM). The surface strain of the fixed mold half and the cavity pressure were monitored simultaneously during ICM. In the compression stage, a directly proportional relationship between the cavity pressure and mold surface strain was found and determined via the regression analysis. By taking the advantage of this relationship, the cavity pressure profile with high accuracy was indirectly obtained from the nondestructive measurement of the mold surface strain. Moreover, the mold surface strain profile could indicate the part weight or thickness and the criticai time when the part surface lost contact with the cavity surface in a large area. The monitoring of the mold surface strain could serve as an interesting alternative to the direct monitoring of the cavity pressure with respect to process and part quality control for ICM.

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“…[2][3][4][5][6] Recently, there has been increasing interest in the l-ICM process, which combines l-IM and hot embossing, for replicating optic and microparts. [7][8][9][10][11][12][13][14] Improved replication accuracy was found on the l-ICM parts compared with l-IM ones. [12][13][14] In this respect, l-ICM can serve as a potential solution for fabricating complicated microparts exhibiting high quality.…”

mentioning

confidence: 99%

Poiseuille/squeeze flow‐induced crystallization in microinjection‐compression molded isotactic polypropylene

Guan

Huang

Wang

2012

J Polym Sci B Polym Phys

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Microinjection-compression molding was used to fabricate isotactic polypropylene part with microscale thickness. The combined effect of shear (up to the order of 10 5 s À1 ) and elongational deformations imposed by the Poiseuille (injection stage) and squeeze (compression stage) flow resulted in pronounced flow-induced crystallization under rapid quenching. Hierarchical crystalline morphology, characterized by two oriented layers, a transitional layer in between, and an isotropic core layer, was detected through the thickness in the upstream region initially filled in injection stage, whereas skincore morphology appeared in the downstream region filled in subsequent compression stage. Under the molding conditions imposing sufficient strain rates, predominant shish-kebabs developed in the oriented layer. Furthermore, the oriented layer thicknesses, crystallinity, b-form content, and melting behavior of molded parts, all of which were closely correlated with the calculated strain rates, as well as the location of inner oriented layer could be manipulated via varying the compression-related parameters.

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Back melt flow in injection–compression molding: Effect on part thickness distribution

Cited by 15 publications

References 14 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

A Proposed Technique to Acquire Cavity Pressure Using a Surface Strain Sensor During Injection-Compression Molding

Poiseuille/squeeze flow‐induced crystallization in microinjection‐compression molded isotactic polypropylene

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