A method of determining a target value of a state variable includes preparing a mixture of the molding material and the gas with different test values of the state variable, and the mixture is respectively compressed or decompressed. In the compression or decompression step, the state variable of the mixture and/or a further state variable of the mixture is measured directly or indirectly, and determination values of a compression behavior variable characteristic of the compression behavior of the mixture are determined from the measurement values. A criterion directed to a solution state of the gas is checked, and a lowest or highest value of the state variable is deduced at which the gas is in solution in the molding material. The lowest or highest value of the state variable at which the gas is in solution in the molding material is used as the target value.

A method of determining a solution state of a gas in a plastic melt used in a plastic shaping method includes: (vi) providing the plastic melt together with the gas in a chamber, (vii) altering—in particular reducing—a volume of the chamber to alter a pressure of the plastic melt together with the gas—in particular increased from a first pressure value to a second pressure value, (viii) introducing the plastic melt into a shaping cavity, (ix) computing at least one compression parameter characteristic of the compression behaviour of the plastic melt, in particular a modulus of compression, from the first pressure value and the second pressure value, and (x) determining from the at least one compression parameter whether the gas is substantially completely dissolved in the plastic melt and/or a solubility limit of the gas in the plastic melt is determined from the at least one compression parameter.

The present invention offers a technique for providing assistance in setting up control for releasing gas from the interior of a mold device to the outside of the mold device. A display device for an injection molding machine display a screen. The screen includes a tab display field, in which a plurality of tabs are arranged, and a selection screen display field, in which selection screens that are selected for the respective plurality of tabs are displayed. The tab display field includes a first tab. The first selection screen, displayed in the selection screen display field when the first tab is selected, includes a plurality of input columns for use in a control of the release of gas from the inside of the mold device to the outside of the mold device.

A resin composition for molding having excellent heat resistance, hardness, cost-effectiveness, and biodegradability is provided by using an amorphous resin material component extracted from plant-derived wood. The resin composition is a hemicellulose monomer obtained by applying a methacrylation reaction or acrylation reaction to a hemicellulose or hemicellulose derivative and has a molecular structure in which a methacrylic group or acryloyl group is bonded to the hemicellulose or hemicellulose derivative. This hemicellulose monomer has excellent injection moldability.

A resin composition for molding having excellent heat resistance, hardness, cost-effectiveness and biodegradability is provided by using amorphous resin material components extracted from plant-derived wood. The resin composition includes a first resin including a hemicellulose or a hemicellulose derivative and a second resin including polymethylmethacrylate (PMMA, acrylic), polycarbonate (PC), cyclo olefin polymer (COP), cyclo olefin copolymer (COC), polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), or polystyrene (PS) and has excellent injection moldability.

A method of determining a target value of a state variable includes preparing a mixture of the molding material and the gas with different test values of the state variable, and the mixture is respectively compressed or decompressed. In the compression or decompression step, the state variable of the mixture and/or a further state variable of the mixture is measured directly or indirectly, and determination values of a compression behavior variable characteristic of the compression behavior of the mixture are determined from the measurement values. A criterion directed to a solution state of the gas is checked, and a lowest or highest value of the state variable is deduced at which the gas is in solution in the molding material. The lowest or highest value of the state variable at which the gas is in solution in the molding material is used as the target value.

A resin composition for molding having excellent heat resistance, hardness, cost-effectiveness and biodegradability is provided by using amorphous resin material components extracted from plant-derived wood. The resin composition includes a first resin including a hemicellulose or a hemicellulose derivative and a second resin including polymethylmethacrylate (PMMA, acrylic), polycarbonate (PC), cyclo olefin polymer (COP), cyclo olefin copolymer (COC), polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), or polystyrene (PS) and has excellent injection moldability.

A resin composition for molding having excellent heat resistance, hardness, cost-effectiveness, and biodegradability is provided by using an amorphous resin material component extracted from plant-derived wood. The resin composition is a hemicellulose monomer obtained by applying a methacrylation reaction or acrylation reaction to a hemicellulose or hemicellulose derivative and has a molecular structure in which a methacrylic group or acryloyl group is bonded to the hemicellulose or hemicellulose derivative. This hemicellulose monomer has excellent injection moldability.

An injection molding machine includes a heating cylinder provided with a gas inlet, a screw, a gas cylinder, a pressure reducing valve configured to reduce a primary pressure of a gas from the gas cylinder to a secondary pressure, a gas supply portion configured to supply the gas at the secondary pressure to the gas inlet, a secondary pressure detection device configured to detect the secondary pressure, and a controller. The controller is configured to detect an abnormality by comparing a set pressure set in advance in the injection molding machine with the secondary pressure.

A method of determining a solution state of a gas in a plastic melt used in a plastic shaping method includes: (vi) providing the plastic melt together with the gas in a chamber, (vii) alteringin particular reducinga volume of the chamber to alter a pressure of the plastic melt together with the gasin particular increased from a first pressure value to a second pressure value, (viii) introducing the plastic melt into a shaping cavity, (ix) computing at least one compression parameter characteristic of the compression behaviour of the plastic melt, in particular a modulus of compression, from the first pressure value and the second pressure value, and (x) determining from the at least one compression parameter whether the gas is substantially completely dissolved in the plastic melt and/or a solubility limit of the gas in the plastic melt is determined from the at least one compression parameter.