Experimental techniques in optimization of the process of injection molding of termoplastics - after-shrinkage of moldings

Bogucki, Marcin; Płaska, S.; Stączek, P.

doi:10.14314/polimery.2003.714

Cited by 4 publications

(10 citation statements)

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“…Each model equation reflects only the mechanism for only one investigated variable, i.e. it expresses the relation where the investigated factor does not change depending on the fact which values are taken by the variables which describe them (independent variables) [12].…”

Section: Statistical Analyses Methodologymentioning

confidence: 99%

“…The plan according to which the samples have been prepared has been worked out on the basis of the literature on theory of design of experiments [11,12,28,29] and the module (DoE, design of experiment) of STATISTICA software for statistical data analysis by StatSoft. Owing to the fact that two-value designs enable to receive the description of the phenomena only at the level of a linear function, which is less accurate for this type of tests, one of the central composition designs has been chosen for investigations.…”

Section: Preparation Of the Design Of Experimentsmentioning

confidence: 99%

“…The issue of the control and use of experimental techniques in injection process modelling by means of screw extruders was broadly discussed in the publications by the team led by Płaska [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Change in injection moulded parts shrinkage and weight as a function of processing conditions

Postawa

Koszkul

2005

Journal of Materials Processing Technology

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Section: Statistical Analyses Methodologymentioning

confidence: 99%

Section: Preparation Of the Design Of Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Change in injection moulded parts shrinkage and weight as a function of processing conditions

Postawa

Koszkul

2005

Journal of Materials Processing Technology

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“…Another more important point to make is that although a rich literature exists on the effect of processing conditions on S&W, most of the research focuses on only one term, either shrinkage1–6, 8, 11, 13, 14, 19, 21, 23, 24, 27, 28 or warpage,7, 9, 10, 16, 17, 20, 25, 26, 29–33 or regard them as a whole entity 18. As a result, little work has been conducted on the different response of these two terms to the processing conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Similar numerical method for warpage simulation was also adopted by Zhou and Li. 17 A clear understanding of the intrinsic relationship between S&W and processing conditions, however, cannot be achieved from above simple approaches, and requires a more scientific research planning, such as the design of experiments (DOE), [18][19][20][21][22][23][24] or a statistic data analysis technique. A typical application of DOE was adopted by Kramschuster et al 18 who grouped the S&W of a box-shaped product into one term, and conducted a 2 6-1 fractional factorial DOE.…”

Section: Introductionmentioning

confidence: 99%

A study on the distinguishing responses of shrinkage and warpage to processing conditions in injection molding

Liu

Zeng

Zhou

et al. 2011

J of Applied Polymer Sci

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A challenging task in injection molding industry is to minimize shrinkage and warpage (S&W) through optimal setting of molding conditions. In determining the relationship between molding conditions and product dimension, most existing literature considered S&W as a whole entity or focused on only one of them. The intention of this study was to distinguish these two terms, and perform a thorough analysis on the effect of operative conditions on S&W during injection molding process through a combination of experimental and numerical methods. Six process parameters with five levels were examined on a box‐shaped product, and the single factor analysis of variance (ANOVA) was adopted in identifying the significance of each variable in the experiment. Results indicated that the effect of processing conditions on shrinkage is different from that on warpage. Specifically, packing pressure affects shrinkage most while packing time is the dominant factor in determining warpage. The reaction of shrinkage to packing pressure is monotonic, whereas the plot of warpage shows a U‐shaped variation. A differential treatment of S&W can therefore help to enhance product quality. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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Shrinkage of moldings and injection molding conditions

Postawa

2005

Polimery

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Skurcz przetwórczy wyprasek a warunki wtryskiwania *) SHRINKAGE OF MOLDINGS AND INJECTION MOLDING CONDITIONS Summary-Results of experiments focused on assessment, in injection molding, of the effects of independent variables (input parameters) on dependent variables: longitudinal shrinkage (S w), perpendicular shrinkage (S p) (Fig. 2 and 3) and weights (m) of the moldings made of semi-crystalline polyoxymethylene (POM) or amorphous polystyrene (PS) were presented. Experiment design consisted of 27 systems investigated and 5 input parameters: mold temperature (T f), injection temperature (T t), clamping pressure (p d), cooling time (t ch) and injection speed (v w) (Table 2 and 3). Diversification of values of perpendicular shrinkage along the way of plastic flow in mold cavity (Fig. 4) has been found. Statistic analysis of the results based on estimation of parameters of regression equations (2) describing the variability of dependent values investigated as the functions of independent variables (Table 6). Analysis of correlation was done as well and the results were presented in the form of matrix of correlation (Table 4 and 5). It results from the data presented that with the aim to control the shrinkage value and molding weight in the industrial practice it is most advantageous to change the clamping pressure as essential easy-to-change parameter.

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Experimental techniques in optimization of the process of injection molding of termoplastics - after-shrinkage of moldings

Cited by 4 publications

References 0 publications

Change in injection moulded parts shrinkage and weight as a function of processing conditions

Change in injection moulded parts shrinkage and weight as a function of processing conditions

A study on the distinguishing responses of shrinkage and warpage to processing conditions in injection molding

Shrinkage of moldings and injection molding conditions

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