In-line Process and Material Property Measurement in Injection Moulding - a Theoretical Review

Hertz, Rasmus Aa; Christensen, J.K.; Kristiansen, Søren; Therkelsen, O.; Schmidt, Lasse

doi:10.1080/21693277.2022.2148136

Cited by 5 publications

(9 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The injection moulding machine used to conduct the experiments in this work is a modified industrial injection moulding machine described in Hertz et al [26,27]. An important sub-process to consider when adjusting machine settings on-line is the switchover process described in Hertz et al [28]. The pressures considered in this work is hydraulic pressures, as it is the pressure directly measured.…”

Section: Hardware and Materialsmentioning

confidence: 99%

“…The injection moulding process contains several states such as, e.g., position, velocity, pressure and temperature. The moulding process considered in this work is called sec-ondary overpoint often used in the industry [3]. It consists of a velocity-controlled fill phase and a pressure-controlled holding phase.…”

Section: Injection Moulding Processmentioning

confidence: 99%

“…The material properties, such as viscosity, pvT, etc., vary depending on, e.g., grade, manufacturer, etc. No studies have according to Hertz et al [3] been published where a general effective measurement of the pvT properties in-line in the injection moulding process has been proposed. For process control, this will limit the use of pvT controlled processes to known materials, and it is further required to track what material is used and when.…”

Section: Shrinkage Of Amorphous Materialsmentioning

confidence: 99%

“…Resilience in the supply chain has further put focus on the use of multiple vendors to ensure a continuous production in crisis situations. This challenges manufacturers to find methods to produce with feedstock from multiple vendors or feedstock with increased variance between batches [3,4]. Plastic parts manufactured from injection moulding are dependent on three main domains being equipment, moulding process and material.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cycle-Based Control of Injection Moulding Process in Presence of Material Dual Sourcing Using Mass Feedback

Hertz,

Therkelsen,

Kristiansen

et al. 2024

Polymers

View full text Add to dashboard Cite

The low cost and precise tolerances of plastic injection moulded products are a major reason for the popularity of the manufacturing method. The tolerances are greatly influenced by the equipment, raw material and moulding process. One challenge is the raw material variation. This paper presents a production process using cycle based feedback of cycle mass, for control of part properties in the presence of material variation from dual sourcing. The part properties considered are part mass and outer dimensions. The process uses direct cycle mass feedback without additional process measurements in the proposed controller structure. The designed controller structure is tested in a multi-cavity mould while using raw materials from multiple vendors, encompassing five different grades. The results show a total decrease in part mass variance of approximately 50% and a decrease of length and width variance of approximately 40% compared to a moulding process with fixed settings.

show abstract

Section: Hardware and Materialsmentioning

confidence: 99%

Section: Injection Moulding Processmentioning

confidence: 99%

Section: Shrinkage Of Amorphous Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cycle-Based Control of Injection Moulding Process in Presence of Material Dual Sourcing Using Mass Feedback

Hertz,

Therkelsen,

Kristiansen

et al. 2024

Polymers

View full text Add to dashboard Cite

show abstract

“…Injection moulding is the most common process for the automated fabrication of plastic parts, partly as a consequence of the high throughput and the ability to obtain a wide range of product shapes. There is considerable active attention placed on the in-line process control and property measurements [2]. The concept of injection moulding technology is rather simple [3].…”

mentioning

confidence: 99%

Industrially relevant Injection Moulding Apparatus for In-Situ Time- Resolving Small-Angle X-ray Scattering Measurements

Costa,

Gameriro,

Massano

et al. 2023

Preprint

View full text Add to dashboard Cite

This work is the first step in the development of a multi-scale digital twin of an injection moulding system. It presents the design and construction of an automated industrial injection moulding apparatus that can be used with a typical multi-user beamline such as the NCD-SWEET small-angle X-ray scattering at the ALBA Synchrotron Light Source. This apparatus is focused on developing an understanding of how the mould temperature and the injection temperature affect both the orientation and morphology of the semi-crystalline polymer used to fabricate the injected parts. The system design follows current industrial practice and enables the collection of time-resolved X-ray scattering data at several points within the mould cavity so we can understand the 4D morphology. In this work we show the effectiveness of the equipment using some results from the injection moulding of isotactic polypropylene and polyhydroxybutyrate.

show abstract

Industrially relevant injection moulding apparatus for in situ time-resolving small-angle X-ray scattering measurements

Costa,

Gameiro,

Massano

et al. 2024

Int J Adv Manuf Technol

View full text Add to dashboard Cite

This work presents the design and construction of an automated industrial injection moulding apparatus that can be used with a typical multi-user beamline such as the NCD-SWEET small-angle X-ray scattering at the ALBA Synchrotron Light Source. This apparatus is focused on developing an understanding of how the mould temperature and the injection temperature and pressure affect both the orientation and morphology of the semi-crystalline polymer used to fabricate the injected parts. The system design follows current industrial practice and enables the collection of time-resolved X-ray scattering data at several points within the mould cavity, so we can understand the 4D morphology. In this work we show the effectiveness of the equipment using some results from the injection moulding of a random copolymer of polypropylene and that it can be used with a more demanding material such as polyhydroxybutyrate. This can be seen as the first step toward a multiscale digital twin for injection moulding.

show abstract

In-line Process and Material Property Measurement in Injection Moulding - a Theoretical Review

Cited by 5 publications

References 49 publications

Cycle-Based Control of Injection Moulding Process in Presence of Material Dual Sourcing Using Mass Feedback

Cycle-Based Control of Injection Moulding Process in Presence of Material Dual Sourcing Using Mass Feedback

Industrially relevant Injection Moulding Apparatus for In-Situ Time- Resolving Small-Angle X-ray Scattering Measurements

Industrially relevant injection moulding apparatus for in situ time-resolving small-angle X-ray scattering measurements

Contact Info

Product

Resources

About