Cavity pressure control during cooling in plastic injection molding

Pramujati, Bambang; Dubay, Rickey; Samaan, C.

doi:10.1002/adv.20068

Cited by 14 publications

(13 citation statements)

References 17 publications

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“…To achieve and maintain high quality of the molded parts, considerable researches have been reported on process monitoring and control of injection molding over the last two decades [2][3][4][5][6][7][8][9]. Among the process variables in injection molding, which mainly include melt pressure (in the nozzle [2,3], runner [2], and cavity [2][3][4][5][6][7][8][9]) and melt temperature (in the nozzle, runner [1], and cavity [2,7]), the cavity pressure is widely recognized to be especially critical to the process control and final part qualities. Specifically, the cavity pressure is found to be a reliable indicator for the shrinkage, warpage, weight, and thickness of the molded part.…”

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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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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“…As mentioned above, no mean currently exists to experimentally determine the solidification history. [13][14][15] The main limit consists in the knowledge of thermal profiles inside the sample: apart for some attempts 16 to build an array of thermocouples, this piece of information is not available experimentally.…”

Section: Resultsmentioning

confidence: 99%

Monitoring of injection molding of thermoplastics: Average solidification pressure as a key parameter for quality control

2011

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The quality of the molded parts depends on the processing conditions, which creates a continuous demand for advanced techniques for monitoring and controlling the process. Temperature and pressure transducers are being used increasingly in industry. Therefore, the use of their measurements to obtain indications concerning the product quality could overcome the traditional resistance of industry to introduce new sensors in their production. The aim of this paper was to select a parameter, which can be identified by adopting pressure and temperature transducers, to correlate with the quality. To this goal, several series of injection molding tests were conducted by adopting a general purpose PS, changing the holding pressure and time, injection time, mould and injection temperature, nozzle length, gate and cavity thickness. The pressure histories and temperature evolution at the interface with the mould at several positions along the flow-path were measured by means of pressure-temperature transducers. The samples were measured after molding, and dimensional accuracy was assumed to be the target quality parameters. The mean solidification pressure, namely the average along the thickness direction of the pressures at which each layer solidifies, is a key parameter for quality control. A procedure not requiring simulation of the entire injection molding test and based on the knowledge of both the local pressure evolution, mold temperature and the polymer thermal diffusivity has been developed to evaluate the local solidification profile.

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“…As to the method for melt temperature control, several researchers have employed the GPC algorithm, [68][69][70] which originated from continuous industrial process control. The melt temperature in the nozzle is one of the few variables in the cyclic injection molding process that can be monitored and controlled continuously, while the cyclic movement of the ram and screw could be treated as periodic disturbances.…”

Section: Melt Temperature Controlmentioning

confidence: 99%

A review of current developments in process and quality control for injection molding

2005

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ABSTRACT:Injection molding is one of the most versatile and important manufacturing processes capable of mass-producing complicated plastic parts in net shape with excellent dimensional tolerance. Injection molding process and quality control has been an active research area for many years, as part quality and yield requirements become more stringent. This paper reviews the state-of-the-art research and development in injection molding control. It organizes prior studies into four categories, namely, process setup, machine control, process control, and quality control, and presents the distinction and connection of these different levels of control. This paper further reviews and compares the typical variables, models, and control methods that have been proposed and employed for those control tasks. Strictly speaking, real online quality control without human intervention has yet to be realized, primarily due to the lack of transducers for online, real time quality response measurement, and a robust model that correlates the control variables with quantitative quality measurements. Based on the research progress to date, this paper suggests that the different levels of control tasks have to be integrated into a multilevel quality control system, and

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Cavity pressure control during cooling in plastic injection molding

Cited by 14 publications

References 17 publications

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

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

Monitoring of injection molding of thermoplastics: Average solidification pressure as a key parameter for quality control

A review of current developments in process and quality control for injection molding

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