Development of Heating and Cooling Injection Mold with Far-Infrared Radiation Heater

Murata, Yasuhiko; Kawamura, Masahiro

doi:10.20965/ijat.2016.p0079

Cited by 8 publications

(3 citation statements)

References 7 publications

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“…The results of our previous study on the measurement of the temperature distribution of a melt flowing in a mold (11) revealed that the temperature in the vicinity of the cavity wall increases with increasing heating cylinder temperature, mold temperature, and injection rate. Furthermore, the results of another previous study on heat-and-cool injection molding (12) demonstrated that the increase in the temperature of a polymer in the vicinity of a cavity wall increases the adhesion between the polymer and the cavity wall. Therefore, our assumption is considered to be valid.…”

Section: Effect Of Molding Conditions On Demolding Resistancementioning

confidence: 94%

Development of Mold for Demolding Resistance Measurement in Polymer Injection Molding

Murata¹,

Nakanishi²,

Hirai³

et al. 2019

Sensors and Materials

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In the injection molding of polymer lenses, the demolding resistance may cause problems, such as deformation, cracks, and scratches, in these products. To examine the method of decreasing the demolding resistance of polymer lenses, a method of precisely measuring the demolding resistance should be established. In this study, we designed and fabricated a mold equipped with high-sensitivity quartz force sensors for demolding resistance measurement that is customized for the injection molding of polymer lenses. In addition, we evaluated the performance of the mold. Using this mold, we measured the demolding resistance of fluorine-based polyester lenses. As a result, it was clarified that (1) the preload applied to the quartz force sensors before the start of mold closing has a significant effect on the generation of demolding resistance, (2) the draft angle of a cavity wall has an effect on the demolding resistance, and (3) the maximum demolding resistance increases with increasing holding pressure, injection rate, heating cylinder temperature, and mold temperature.

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Section: Effect Of Molding Conditions On Demolding Resistancementioning

confidence: 94%

Development of Mold for Demolding Resistance Measurement in Polymer Injection Molding

Murata¹,

Nakanishi²,

Hirai³

et al. 2019

Sensors and Materials

Self Cite

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“…Some of the authors of this paper have proposed a heating and cooling injection mold that can be easily heated using a far-infrared radiation heater and a three-dimensional cavity plate. The effects of heating the mold cavity surface on the appearance of molded products composed of fiber-reinforced thermoplastics have been examined using this mold [37,38]. Since an infrared radiation heater is often used to heat the sheets in overmolding, we speculated as to whether it would be possible to heat both the sheet and the mold surface simultaneously using only one far-infrared radiation heater.…”

Section: Introductionmentioning

confidence: 99%

Influence of Processing Conditions on the Generation of Surface Defects in a Heat-and-Cool Hybrid Injection Molding Technique for Carbon Fiber-Reinforced Thermoplastic Sheets and Development of a Suitable Mold Heated by Far-Infrared Radiation

Murata,

Machiya,

Komori

2023

Polymers

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Recently, hybrid injection molding—a type of overmolding technology in which a short carbon fiber-reinforced thermoplastic is injection molded over a compression-molded carbon fiber-reinforced thermoplastic (CFRTP) sheet—has been introduced. A heat-and-cool hybrid injection molding technique has also been introduced for practical use. The technique yields high-quality molded products. This is achieved through the heating of the mold cavity surface to a temperature higher than the melting point of the base polymer impregnated into the carbon fiber fabric. However, few experimental analyses of the molding phenomena in heat-and-cool hybrid injection molding have been reported. In particular, the effect of the processing conditions on the transfer of the mold cavity surface shape to the CFRTP sheet has not been clarified in detail. Therefore, it has been impossible to take extensive measures when defects are generated in molded products. In this study, a mold is designed and fabricated for use with far-infrared radiation heating, a variotherm technology that is suitable for the experimental analysis of the heat-and-cool hybrid injection molding phenomenon. In particular, a mold is designed and fabricated to continuously perform the following three processes using only an injection molding machine: (1) the radiation heating of both the CFRTP sheet and the mold cavity surface using a far-infrared radiation heater, (2) the compression molding of the CFRTP sheet, and (3) the injection molding of the melt. The effects of the heating conditions of the mold and the injection molding process conditions on the appearance characteristics of the molded products are clarified using this mold and a far-infrared radiation heater.

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“…Several approaches have been proposed in the literature to modulate the cavity temperature during the process, such as introduction of radiation sources, induction coils, and proximity heating. The induction heating is realized by introducing a cavity insert wound with induction coils, which allows temperature modulation [14]. The radiation heating is based on the introduction of a movable insert that can be heated by an infrared source [8].…”

Section: Introductionmentioning

confidence: 99%

Rapid Heating of Mold: Effect of Uneven Filling Temperature on Part Morphology and Molecular Orientation

Liparoti¹,

Sofia²,

Pantani³

2023

Processes

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Mold temperature is the key parameter in determining the morphology of molded parts. Uneven temperature distribution could induce significant effects on part performances. In such cases, uneven temperature is induced to analyze the morphology developed in the molded specimens. The technology used for controlling mold temperature during the process is crucial to maintain the short processing time. This paper proposed a strategy for controlling mold temperature during the process, avoiding a significant increase in processing time. A thin electrical heater is designed and adapted below the cavity surface, allowing for the increase of the cavity surface temperature soon after the mold closure, and the fast decrease of the mold temperature soon after the filling. The effect of several heating powers and heating durations on the molecular orientation was analyzed and exploited considering the temperature and flow field realized during the process.

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Development of Heating and Cooling Injection Mold with Far-Infrared Radiation Heater

Cited by 8 publications

References 7 publications

Development of Mold for Demolding Resistance Measurement in Polymer Injection Molding

Development of Mold for Demolding Resistance Measurement in Polymer Injection Molding

Influence of Processing Conditions on the Generation of Surface Defects in a Heat-and-Cool Hybrid Injection Molding Technique for Carbon Fiber-Reinforced Thermoplastic Sheets and Development of a Suitable Mold Heated by Far-Infrared Radiation

Rapid Heating of Mold: Effect of Uneven Filling Temperature on Part Morphology and Molecular Orientation

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