For each of different resins R, a zero shear viscosity ?o of each resin R is obtained by using a conversion function expression whose parameters are a melt flow rate (MFR) and a set temperature of a heating cylinder and is registered. Also, a purge resin required amount Wu corresponding to a viscosity difference ?d between the zero shear viscosity ?of of a former resin Rf and the zero shear viscosity ?os of a succeeding resin Rs is registered. When resin switching is performed, the zero shear viscosity ?of of the former resin Rf and the zero shear viscosity ?os of the succeeding resin Rs are obtained by inputting the MFR of the former resin Rf and the MFR of the succeeding resin Rs to a molding machine controller, the viscosity difference ?d between the zero shear viscosity ?of of the former resin Rf and the zero shear viscosity ?os of the succeeding resin Rs is obtained, an amount of a purge resin required for resin switching is obtained as a purge resin required amount Wu, and at least the obtained purge resin required amount Wu is displayed.

The invention relates to a method for filling a mold cavity of a molding tool in a volumetrically correct manner. A molded part/volume equivalence is ascertained during a learning phase, and production injection-molding cycles are influenced during a production phase such that the molded part/volume equivalence ascertained during the learning phase is also satisfied during the production injection-molding cycle.

The present disclosure pertains to injection molding methods, tooling, and products. An example injection molding tool that can be used to create both a part with an aperture and a part without an aperture. The injection molding tool has a first portion; a second portion; a first insert installed on the first portion, the insert comprising a protrusion that creates a gap relative to a sidewall of the second portion when the first portion and the second portion are closed to form an injection molding tool; and a material source that flows material into the injection molding tool, the material having a melt flow rate that is below a melt flow rate threshold to create a first part with an aperture due to the presence of the protrusion and the gap, wherein the aperture has no flashing.

A process of forming molded articles using an injection molding apparatus is provided. The process includes providing a thermoplastic material to the injection molding apparatus. The thermoplastic material is heated such that the thermoplastic material is in a molten state. The molten thermoplastic material is injected into at least one mold cavity of the injection molding apparatus using an injection element. A melt pressure of the thermoplastic material filling the at least one mold cavity is monitored using a sensor. The sensor provides a signal indicative of melt pressure in the cavity to a controller. The controller controls the injection element thereby changing melt pressure of the thermoplastic material filling the at least one mold cavity based on the signal to reach a target cavity pressure. A molded article is formed by reducing a mold temperature of the thermoplastic material within the at least one mold cavity.

Provided by the present disclosure is an ultrasonic phased array-based in-situ imaging method for melt flow in injection molding. The ultrasonic phased array is used for the detection of an injection molding process for the first time, and an effective dynamic monitoring imaging method for a melt front position is developed. A melt flow process in a mold cavity is dynamically monitored by collecting an FMC (Full matrix capture) dataset online. A mapping relationship between an incident angle and a target pixel point is established to rapidly determine time delay of each point in a measurement target region, and a melt bottom image is acquired using TFM (Total focusing method) imaging conditions, from which the melt front can be localized. The provided method is high in measurement accuracy, short in imaging time, and capable of effectively improving imaging efficiency of online measurement.

A resin molding method includes a physical property estimation step and a molding step. In The physical property estimation step, a resin is irradiated with electromagnetic waves including near-infrared rays; electromagnetic wave intensity of electromagnetic waves reflected by a surface of the resin is estimated; and flowability of the resin is estimated, based on electromagnetic wave intensity information that includes the electromagnetic wave intensity. In the molding step, a molding condition is adjusted, based on the estimated flowability of the resin; and the resin is molded under the adjusted molding condition.