Improving the Properties of Injection Molded Products with Induction Heating and Cooling Molds

2015 ◽  
Vol 9 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Yasuhiko Murata ◽  
◽  
Masayoshi Koike ◽  
Song Pan
Keyword(s):  
Tensile Test ◽  
Surface Temperature ◽  
Induction Heating ◽  
High Impact ◽  
Mold Cavity ◽  
Cavity Surface ◽  
Filling Process ◽  
High Impact Polystyrene ◽  
Heating And Cooling ◽  
Injection Molded

An induction heating and cooling mold that can keep the surface temperature of the entire mold cavity uniform and has a new heating and cooling insert with a gas vent mechanism is designed and produced. The effects of the temperature of the mold cavity surface, of the cavity air during the melt filling process, and of the organic gas generated fromthe melt on the appearance andmechanical properties of an injectionmolded product made of high impact polystyrene are studied. It is found that the heating and coolingmold with a gas vent can suppress molding defects, such as a weld lines and gas burns, and can greatly increase the displacement ratio of molded products obtained in the tensile test. This means that the effects of the gas vent and the surface temperature of the cavity have been quantitatively clarified using this type of mold.

scholarly journals Hierarchical Structure of iPP During Injection Molding Process with Fast Mold Temperature Evolution

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 424 ◽  
Author(s):  
Vito Speranza ◽  
Sara Liparoti ◽  
Roberto Pantani ◽  
Giuseppe Titomanlio
Keyword(s):  
Injection Molding ◽  
Surface Temperature ◽  
Hierarchical Structure ◽  
Flow Fields ◽  
Electrical Heating ◽  
Cavity Surface ◽  
Injection Molding Process ◽  
Mold Surface ◽  
Molding Process ◽  
Injection Molded

Mold surface temperature strongly influences the molecular orientation and morphology developed in injection molded samples. In this work, an isotactic polypropylene was injected into a rectangular mold, in which the cavity surface temperature was properly modulated during the process by an electrical heating device. The induced thermo-mechanical histories strongly influenced the morphology developed in the injection molded parts. Polarized optical microscope and atomic force microscope were adopted for morphological investigations. The combination of flow field and cooling rate experienced by the polymer determined the hierarchical structure. Under strong flow fields and high temperatures, a tightly packed structure, called shish-kebab, aligned along the flow direction, was observed. Under weak flow fields, the formation of β-phase, as cylindrites form, was observed. The formation of each morphological structure was analyzed and discussed on the bases of the flow and temperature fields, experienced by the polymer during each stage of the injection molding process.

scholarly journals Study on Induction Heating Coil for Uniform Mold Cavity Surface Heating

2014 ◽  
Vol 6 ◽  
pp. 349078 ◽  
Author(s):  
Yu-Ting Sung ◽  
Sheng-Jye Hwang ◽  
Huei-Huang Lee ◽  
Durn-Yuan Huang
Keyword(s):  
Induction Heating ◽  
Surface Heating ◽  
Mold Cavity ◽  
Cavity Surface ◽  
Heating Coil

scholarly journals Enhanced Wetting and Adhesive Properties by Atmospheric Pressure Plasma Surface Treatment Methods and Investigation Processes on the Influencing Parameters on HIPS Polymer

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 901
Author(s):  
Miklós Berczeli ◽  
Zoltán Weltsch
Keyword(s):  
Surface Treatment ◽  
Plasma Treatment ◽  
Atmospheric Pressure ◽  
High Impact ◽  
Plasma Parameters ◽  
Plasma Surface ◽  
Wetting Properties ◽  
High Impact Polystyrene ◽  
Process Modification ◽  
Plasma Surface Treatment

The development of bonding technology and coating technologies require the use of modern materials and topologies for the demanding effect and modification of their wetting properties. For the industry, a process modification process that can be integrated into a process is the atmospheric pressure of air operation plasma surface treatment. This can be classified and evaluated based on the wettability, which has a significant impact on the adhesive force. The aim is to improve the wetting properties and to find the relationship between plasma treatment parameters, wetting, and adhesion. High Impact PolyStyrene (HIPS) was used as an experimental material, and then the plasma treatment can be treated with various adjustable parameters. The effect of plasma parameters on surface roughness, wetting contact angle, and using Fowkes theory of the surface energy have been investigated. Seven different plasma jet treatment distances were tested, combined with 5 scan speeds. Samples with the best plasma parameters were prepared from 25 mm × 25 mm overlapping adhesive joints using acrylic/cyanoacrylate. The possibility of creating a completely hydrophilic surface was achieved, where the untreated wetting edge angle decreased from 88.2° to 0° for distilled water and from 62.7° to 0° in the case of ethylene glycol. The bonding strength of High Impact PolyStyrene was increased by plasma treatment by 297%.

Effect of Triaryl Phosphate, Zinc and Zinc Borate on Fire Properties of High Impact Polystyrene and High Impact Polystyrene-Polyphenylene Oxide Blend (Modified-Polyphenylene Oxide

1994 ◽  
Vol 12 (6) ◽  
pp. 529-550 ◽  
Author(s):  
Ramazan Benrashid ◽  
Gordon L. Nelson ◽  
Donald J. Ferm
Keyword(s):  
Flame Retardancy ◽  
High Impact ◽  
Zinc Borate ◽  
Polyphenylene Oxide ◽  
High Impact Polystyrene ◽  
Smoke Generation ◽  
Flame Retarded ◽  
Rate Of Heat Release ◽  
Fire Properties ◽  
Phase Activity

Samples of m-PPO (virgin and flame retarded) and high impact polystyrene blended with zinc and zinc borate (2ZnO·3B2O3·3.5H 2O), were pre pared. The effect of triaryl phosphate on the flame retardancy of PPO-HIPS in conjunction with zinc and zinc borate was studied. For polystyrene zinc borate shows some reduction in smoke generation. Zinc, however does not show any effect on smoke generation for high impact polystyrene. Triphenyl phosphate shows minimal flame retardancy in HIPS which is not enhanced by zinc. Addition of zinc gives an increase in oxygen index for FR m-PPO, whereas zinc borate decreases the OI values. Zinc borate may sequester triaryl phos phate and thus eliminate its vapor phase activity. Zinc borate shows a signifi cant reduction in smoke generation and rate of heat release for m-PPO.

Studies on the stretching behaviour of medium gauge high impact polystyrene sheets during positive thermoforming

2014 ◽  
Vol 31 (1) ◽  
pp. 96-112 ◽  
Author(s):  
Satish Kommoji ◽  
Ritima Banerjee ◽  
Naresh Bhatnagar ◽  
Anup K Ghosh
Keyword(s):  
High Impact ◽  
High Impact Polystyrene

scholarly journals The co-pyrolysis of flame retarded high impact polystyrene and polyolefins

2007 ◽  
Vol 80 (2) ◽  
pp. 406-415 ◽  
Author(s):  
William J. Hall ◽  
Nona Merry M. Mitan ◽  
Thallada Bhaskar ◽  
Akinori Muto ◽  
Yusaku Sakata ◽  
...  
Keyword(s):  
High Impact ◽  
High Impact Polystyrene ◽  
Flame Retarded
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