Processing and Molding Polymers with 1.5 Nanometer Titanates and Ziroconates in Pellet Form
Added to the hopper just like a color concentrate, 2 to 3 parts of a phosphato titanate or zirconate in pellet masterbatch form per 1,000 parts of filled or unfilled compound provides a method (Function 1-Coupling) for in-situ interfacial nano-surface modification of most all inorganic and organic materials in a compound independent of the interface’s hydroxyl content and absent the need for water to effect hydrolysis for coupling as with silanes while providing metallocene-like repolymerization catalysis (Function 2-Catalysis) and (Function 3) nano-intumescence for flame retardance resulting in: the use of larger amounts of regrind and recycle; copolymerization of blends of dissimilar addition and condensation polymers such as HDPE, PP and PET; prevention of delamination of PP/HDPE blends; faster production cycles at lower temperatures producing thermoplastic parts having less heat stress differentials, better finish, and increased stress-strain strength; and control of burn rate and burn rate exponent.
How to Evaluate the Performance of an Injection Molding Process?
An injection molding engineering system is composed of the following sub-systems: plastic material, part structure design, injection molding machine, injection mold, and molding process condition. In practice, the performance evaluation of an injection molding engineering system can’t be done until the injection mold is developed, manufactured, and assembled; and a molding process condition is worked out to go with it. Therefore, in reality in the industry, the performance evaluation of an injection molding engineering system refers to more about for newly developed injection mold and molding process condition, assuming that the other three sub-systems – plastic material, part structure design, and injection molding machine – are fixed and can’t be changed. And the process flow of the performance evaluation is also considered the qualification process of a newly developed injection mold with a specific molding process condition for the decision whether the mold should be approved capable or not to release for mass production.
Mechanical Characterization and Effect of Water Absorption on PLA Carbon Fiber Composites in Injection Molding
This study investigated the mechanical behaviors of injection molded polylactic acid (PLA) composites reinforced with carbon fiber (CF) at different fiber loading levels (5 wt%, 10 wt%, 15 wt% & 20 wt%). PLA, a biodegradable thermoplastic derived from renewable resources, has been replacing petroleum-based plastics in many applications due to its sustainability and low environmental impact. However, the low mechanical strength limits its wide structural applications. The addition of small amount of CF significantly increased the tensile strength and modulus while leading to reduced ductility.
Revisiting Boltzmann Kinetics in Applied Rheology
The dynamic viscosity of resins undergoing soft gelation shows a marked sigmoidal shape, suggesting that similarly shaped functions might be considered for model predictions.
Gas Assist Injection Molding
Gas assist injection molding is a process with a high speed and low-pressure injection method. It involves the injection of high-pressure nitrogen gas into the melt stream instantly. You’ll use a short shot method of resin fill and utilize the gas to fill and pack out the remainder of the part. There are four main considerations for a successful application of the technology…
Vibration Assisted Injection Molding for PLA with Enhanced Mechanical Properties and Reduced Cycle Time
This research was focused on the effect of processing parameters on physical characteristics of poly-lactic acid (PLA) during vibration assisted injection molding (VAIM). In vibration assisted injection molding processes, the travel of the injecting screw is moved back and forth to create an oscillatory motion during the injection stage of the molding process.
Fusion Labeling Technology Makes Low Surface Energy (LSE) Polyolefin Durable Goods Safer
From the late 1970’s to present, Consumer Safety has become the driving force behind safety labeling standards that test everything from label construction and adhesion, to chemical and environmental durability as warning/informative labels have become more prominently used on durable goods products made for a variety of industries.
The Gate
The gate is a key component for the filling of the part from a tooling point of view. The gate is not used as a balancing tool. This is usually determined by the runner. The gate geometry should not be adjusted until you have generated data. The data includes but is not limited to: gate freeze time, pressure drop, and shear. The gate should be identical in multicavity tools. The gate is composed of three things: land, height, and width. This provides necessary information for overall effect on the processing window.
A Preliminary Study on the Performance of Additive Manufacturing Tooling for Injection Molding
Tooling for injection molding is expensive and the time it takes to manufacture a tool is also a concern, especially for companies who are on a tight production schedule. The introduction of Additive Manufacturing (AM) tooling for injection molding is an attractive option for cutting cost and time for not only prototype designs, but also for short production runs. The objective of this research is a preliminary study on two AM tooling questions: How long will the plastic tool survive, and will the parts look similar to the parts produced from a traditional steel tool?
