In one aspect there is disclosed a method of improving shot repeatability in a multilayer reciprocating screw injection molding apparatus by preventing pressure communication or “cross-talk” between melt channels. In the first aspect an outlet nozzle valve is closed prior to closing a check valve within an injection unit of the multilayer reciprocating screw injection molding apparatus. In another aspect there is disclosed a method of improving shot repeatability in a reciprocating screw injection molding apparatus by recording a first position of a screw within the barrel of an injection unit of a reciprocating screw injection molding apparatus, the first position corresponding to a volume of melt within the barrel of the material injection unit. A second position of the screw is then calculated based on the first position, the second position corresponding to a transition position of the screw within the barrel of the injection unit of the reciprocating screw injection molding apparatus.

Method for improving a cycle time of a molding system operating in cycles, wherein the molding system is set up to produce molded parts in cycles, wherein the cycles include partial phases, for at least one partial phase or at least one group of partial phases a partial phase duration is measured or ascertained with reference to settings of the molding system, an optimum partial phase duration is calculated for the at least one partial phase or the at least one group of partial phases on the basis of a machine configuration, if the measured or ascertained partial phase duration deviates from the optimum partial phase duration by more than a predefined amount, an indication that the setting of the molding system is improvable with respect to the at least one partial phase or the at least one group of partial phases is issued.

An injection molding machine management system, which manages an injection molding unit including an injection molding machine and a peripheral device that performs a previous step or a subsequent step of a molding step, includes a first display unit that displays a first screen for displaying a state of the molding step of the injection molding machine. The first screen includes a first screen area and a second screen area. The first screen area displays a first indicator related to quality in the molding step of the injection molding machine, and the second screen area displays a second indicator related to quality in the previous step of the molding step or the subsequent step of the molding step.

A molding machine control system includes a display section configured to display an operation item of an injection molding machine and an operation item of a peripheral equipment included in a setup operation of the injection molding machine, wherein the display section displays a first discriminatory indication configured to discriminate JOB 1 as a first job of the injection molding machine and JOB 2 as a second job of the injection molding machine, a progress situation of the operation item of the injection molding machine corresponding to JOB 1, a progress situation of the operation item of the peripheral equipment corresponding to JOB 1, a progress situation of the operation item of the injection molding machine corresponding to JOB 2, and a progress situation of the operation item of the peripheral equipment corresponding to JOB 2 in a view format.

A controller of an injection molding machine includes a detection part configured to detect whether or not a process in each process performed in the injection molding machine has started based on preset conditions in the process, and an output part configured to output waveform information representing a change of a performance value detected in the process or a subsequent process that is subsequent to the process when the detection part detects that the process has started.

The present invention provides: a reaction injection molding liquid mixture comprising a norbornene-based monomer, a metathesis polymerization catalyst that includes tungsten as a center metal, an activator, and an ether compound represented by a formula (1), wherein R.sup.1 to R.sup.4 are independently an alkyl group having 1 to 6 carbon atoms, the reaction injection molding liquid mixture comprising the activator and the ether compound in a molar ratio (ether compound/activator) of 0.7/1 to 30/1; a method for producing a reaction injection molded product comprising a reaction injection molding step that includes subjecting the reaction injection molding liquid mixture according to any one of claims 1 to 4 to bulk polymerization inside a mold; a reaction injection molded product obtained using the method for producing a reaction injection molded product. Consequently, the present invention provides: a reaction injection molding liquid mixture that makes it possible to obtain a reaction injection molded product that has an excellent surface (surface state) and exhibits excellent strength while preventing a situation in which the resin remains on the surface of the mold when the resin is removed from the mold, a method for producing a reaction injection molded product using the same, and a reaction injection molded product obtained using the method. ##STR00001##

The present invention displays the same molding condition on an injection molding device and on an upper level management device. This molding condition display system includes an injection molding device and a management device. The injection molding device comprises: a display; a storage unit for storing a first molding condition display program that causes the display to display molding conditions, and a second molding condition display program that corresponds to the first molding condition display program and that causes a display device of the management device to display the molding conditions stored in the management device; and a transmission unit that transmits the second molding condition display program from the storage unit of the injection molding device to the management device. The management device comprises a reception unit that acquires the second molding condition display program from the injection molding device.

Non-time dependent calculated variables based on measured strain are used to effectively determine an optimal hold profile for an expanding crosslinking polymer part in a mold cavity. A system and/or approach may first inject molten expanding crosslinking polymer into a mold cavity, then measure strain at the mold cavity or at another location within the injection molding system, and then calculate at least one non-time dependent variable during an injection molding cycle. Next, the system and/or method commences a hold profile for the part, and upon completing the hold profile, the part is ejected from the mold cavity, whereupon a cure profile is commenced.

Systems and approaches for determining design of experiment parameters using largest empty area rectangle optimization for an injection molding system. The systems and methods include obtaining pressure versus time data sets indicative of fill step pressures and corresponding fill step times for a plurality of mold cycles and defining a low and high pressure versus time curves from the data sets, with the low and high pressure versus time curves being two surfaces of a geometric shape. The systems and methods further include identifying a top surface and a bottom surface of the geometric shape; identifying a rectangle having the largest area of all rectangles contained within the first geometric shape; and generating design of experiment parameters from the largest area rectangle.

A time Gt from the start of an injection step until a mold clamping operation is complete is compared with an operation time Ct for a mold clamping step. For Gt<Ct, the injection step is started when a time Dt equal to a difference between Gt and Ct elapses. On the other hand, for Gt≧Ct, after the start of the injection step, a movable platen is stopped at a mold touch position until the time Dt elapses. When the time Dt elapses, the mold clamping step is started.