Active Air Venting of Mold Cavity to Improve Performance of Injection Molded Direct Joining

2021 ◽  
Author(s):  
Fuminobu Kimura ◽  
Shotaro Kadoya ◽  
Yusuke Kajihara
Keyword(s):  
Mold Cavity ◽  
Improve Performance ◽  
Injection Molded

Influence of Process Conditions on the Local Shrinkage and on the Pressure Evolution inside the Mold Cavity of the Injection Molded Polypropylene in Two Modifications - PP Homopolymer; 40 % Talc Filled PP

2015 ◽  
Vol 669 ◽  
pp. 11-18
Author(s):  
Robert Záboj
Keyword(s):  
Rectangular Plate ◽  
Wall Thickness ◽  
Injection Rate ◽  
Semicrystalline Polymer ◽  
Mutual Interaction ◽  
Mold Cavity ◽  
Process Conditions ◽  
Melt Temperature ◽  
Injection Molded ◽  
Pressure Evolution

This work is focusing on optimization of the chosen process conditions (melt temperature, injection rate and holding pressure) and their mutual interaction on the local shrinkage of wall thickness carried out on rectangular plate. The test was applied on semicrystalline polymer in following modifications - polypropylene homopolymer and 40 % talc filled polypropylene. For better understanding of processes influencing shrinkage the pressure evolution inside cavity was captured by transducers placed near the gate and at the end of flow.

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 Soft Tooling-Friendly Inductive Mold Heating—A Novel Concept

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 454
Author(s):  
Tobias Vieten ◽  
Davide Zanin ◽  
Andrea Knöller ◽  
Thomas Litwin ◽  
Wolfgang Eberhardt ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Seed Layer ◽  
Metal Layer ◽  
Mold Cavity ◽  
Proof Of Concept ◽  
Process Chain ◽  
Pvd Coating ◽  
Injection Molded ◽  
Novel Concept ◽  
Fabrication Parameters

In order to economize injection molded prototypes, additive manufacturing of, e.g., curable plastics based tools, can be employed, which is known as soft tooling. However, one disadvantage of such tools is that the variothermal process, which is needed to produce polymeric parts with small features, can lead to a shorter lifespan of the tooling due to its thermally impaired material properties. Here, a novel concept is proposed, which allows to locally heat the mold cavity via induction to circumvent the thermal impairment of the tooling material. The developed fabrication process consists of additive manufacturing of the tooling, PVD coating the mold cavity with an adhesion promoting layer and a seed layer, electroplating of a ferromagnetic metal layer, and finally patterning the metal layer via laser ablation to enhance the quality and efficiency of the energy transfer as well as the longevity by geometric measures. This process chain is investigated on 2D test specimens to find suitable fabrication parameters, backed by adhesion tests as well as environmental and induction tests. The results of these investigations serve as proof of concept and form the base for the investigation of such induction layers in actual soft tooling cavities.

scholarly journals Mold-Face Heating Mechanism, Overflow-Well Design, and Their Effect on Surface Weldline and Tensile Strength of Long-Glass-Fiber-Reinforced Polypropylene Injection Molding

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2474 ◽  
Author(s):  
Po-Wei Huang ◽  
Hsin-Shu Peng ◽  
Wei-Huang Choong
Keyword(s):  
Tensile Strength ◽  
Injection Molding ◽  
Structural Strength ◽  
Infrared Heating ◽  
Mold Cavity ◽  
Heating Method ◽  
Molded Part ◽  
Glass Fiber Reinforced ◽  
Long Glass Fiber ◽  
Injection Molded

Long-fiber polymers offer the advantage of a lower production cost because specific tool designs are required for conventional injection molding equipment to produce long-fiber polymer parts. The use of long fibers allows relatively high fiber aspect ratios to be obtained, thereby enhancing composite stiffness, strength, creep endurance, and fatigue endurance. However, the multigate design of the injection-molded part can result in weldline formation during the molding process, which reduces the structural strength of the molded part. Therefore, in this study, the surface quality, fiber compatibility, and structural strength of long-glass-fiber-reinforced polypropylene (PP/LGF) injection-molded samples were compared in the use versus nonuse of a mold-cavity overflow-well area and the mold-face infrared heating method. The experimental results indicate that the mold-cavity overflow-well area more greatly improved the surface roughness of the PP/LGF molded samples. Moreover, the infrared heating of the mold-face decreased the weldline depth of the samples. Optical-microscopy images and mold-cavity pressure distributions indicated that the weldline tensile strength and the interface compatibility between fibers and melts at the weldline region during the molding stage were higher in the use than in the nonuse of the mold-cavity overflow-well and mold-face infrared heating method.

Replication of the Superstition and Performance Study by

2014 ◽  
Vol 45 (3) ◽  
pp. 239-245 ◽  
Author(s):  
Robert J. Calin-Jageman ◽  
Tracy L. Caldwell
Keyword(s):  
Task Difficulty ◽  
Statistical Power ◽  
Meta Analysis ◽  
A Priori ◽  
Significant Heterogeneity ◽  
Performance Study ◽  
Improve Performance ◽  
Research Designs ◽  
Series Of Experiments ◽  
And Performance

A recent series of experiments suggests that fostering superstitions can substantially improve performance on a variety of motor and cognitive tasks ( Damisch, Stoberock, & Mussweiler, 2010 ). We conducted two high-powered and precise replications of one of these experiments, examining if telling participants they had a lucky golf ball could improve their performance on a 10-shot golf task relative to controls. We found that the effect of superstition on performance is elusive: Participants told they had a lucky ball performed almost identically to controls. Our failure to replicate the target study was not due to lack of impact, lack of statistical power, differences in task difficulty, nor differences in participant belief in luck. A meta-analysis indicates significant heterogeneity in the effect of superstition on performance. This could be due to an unknown moderator, but no effect was observed among the studies with the strongest research designs (e.g., high power, a priori sampling plan).

Comparison of Rheumatological Diagnoses by a Bayesian Program and by Physicians

1991 ◽  
Vol 30 (03) ◽  
pp. 187-193 ◽  
Author(s):  
H. J. Moens ◽  
J. K. van der Korst
Keyword(s):  
Receiver Operating Characteristics ◽  
Bayesian Decision ◽  
Operating Characteristics ◽  
Likelihood Ratios ◽  
Improve Performance ◽  
Mathematical Basis ◽  
Human Expert ◽  
Test Population ◽  
Sensitivity Specificity ◽  
Diagnostic Outcome

AbstractA Bayesian decision support system was developed for the diagnosis of rheumatic disorders. Knowledge in this system is represented as evidential weights of findings. Simple weights were calculated as the logarithm of likelihood ratios on the basis of 1,000 consecutive patients from a rheumatological clinic. The effect of various methods to improve performance of the system by modification of the weights was studied. Three methods had a mathematical basis; a fourth consisted of weights adapted by a human expert, which allowed inclusion of diagnostic rules such as defined in widely accepted criteria sets. The system’s performance was measured in a test population of 570 different cases from the same clinic and compared with predictions of diagnostic outcome made by rheumatologists. The weights from a human expert gave optimal results (sensitivity 65% and specificity 96%), that were close to the physicians’ predictions (sensitivity 64% and specificity 98%). The methods to measure the performance of the various models used in this study emphasize sensitivity, specificity and the use of receiver operating characteristics.

Pemodelan Enterprise Arsitektur Sistem Informasi Pemesanan Jasa Percetakan Menggunakan Kerangka TOGAF

2020 ◽  
Vol 4 (2) ◽  
pp. 18
Author(s):  
Bibit - Sudarsono ◽  
Umi - Faddillah
Keyword(s):  
Information Systems ◽  
Business Process ◽  
Business Processes ◽  
Enterprise Modeling ◽  
Improve Performance ◽  
Business Opportunity ◽  
Service Information ◽  
Process Architecture ◽  
System Architecture Design ◽  
A Company

Printing service order information systems sometimes experience problems in completing running business processes including, frequent loss and inaccuracy in registering orders from customers, often also losing order data from customers, recording orders often experience errors, resulting inaccurate reporting of order data. A computerized ordering service information system will greatly help improve performance and accuracy in making reports on business processes running at a company. The existence of enterprise modeling of information systems ordering printing services with the TOGAF framework will be a method that greatly helps management make a decision that will synergize with the business process activities at the company. So that the objectives of the system can be achieved properly. The TOGAF framework can be a solution and will help to produce a system architecture design, a business process architecture, a technology architecture, a number of proposed business opportunity strategy proposals and an ongoing system change proposal.

Sign in / Sign up

Export Citation Format

Share Document