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US 12,722,332 B2Granted
Injection molding machine for foam molding
AssigneeThe Japan Steel Works, Ltd.
InventorsAkihiro Naito, Takuya Yufu
Life of this patent
Estimating the term…
Abstract
An injection molding machine for foam molding includes: a heating cylinder; a screw disposed in the heating cylinder; and a plurality of inlet portions provided in the heating cylinder and configured to introduce inert gas. An inside of the heating cylinder includes a starvation section on an upstream side in which a pressure of the resin is decreased, and the inert gas from the plurality of inlet portions being to be supplied in the starvation section. Each of the plurality of inlet portions is provided with a check valve or an opening and closing mechanism. A product P×N of an interval P of the plurality of inlet portions and a number N of the inlet portions is 0.5H or more and 1.71H or less with respect to a length H of the starvation section.
Claims7
An injection molding machine for foam molding, comprising:
- a heating cylinder;
- a screw disposed in the heating cylinder;
- and
- a plurality of inlet portions provided at a plurality of positions spaced apart from each other in an axial direction in the heating cylinder and configured to introduce inert gas,
- wherein an inside of the heating cylinder is divided into a first stage on an upstream side of the screw and a second stage on a downstream side of the screw,
- wherein the first stage comprises a supply section on the upstream side of the first stage in which a resin is melted, a first compression section on the downstream side of the first stage in which a molten resin is compressed, and a first measurement section on the most downstream side of the first stage,
- wherein the second stage comprises a starvation section on the upstream side of the second stage in which a pressure of the resin is decreased, a second compression section on the downstream side of the second stage in which the molten resin is compressed, and a second measurement section on the most downstream side of the second stage, and
- wherein the inert gas from the plurality of inlet portions is supplied in the starvation section,
- wherein each of the plurality of inlet portions is provided with a check valve or an opening and closing mechanism,
- wherein a product P×N of an interval P of the plurality of inlet portions and a number N of the inlet portions is 0.5H or more and 1.71H or less with respect to a length H of the starvation section,
- wherein in a state in which more than two inlet portions of the plurality of inlet portions are provided, a distance of the interval P between adjacent inlet portions is identical to a distance between other adjacent inlet portions,
- wherein the plurality of inlet portions are disposed so that at least one inlet portion is present on an inner side in a range of 0.1S or more from two ends of the starvation section in a period from start to completion of a measurement, a measurement stroke S being a length of the screw moving backwards at a time of measurement,
- wherein the interval P of the plurality of inlet portions is 0.25S or more and 0.8S or less with respect to the measurement stroke S,
- wherein the product P×N of the interval P of the plurality of inlet portions and the number N of the inlet portions is 0.5S or more and 1.6S or less with respect to the measurement stroke S,
- wherein the number N of the plurality of inlet portions is two or more and four or less,
- wherein a quotient P/H of the interval P of the plurality of inlet portions and the length H of the starvation section is between 0.4 or more and 0.8 or less, and
- wherein the plurality of inlet portions are arranged eccentric to an upstream side or a downstream side with respect to the starvation section.
14 more elements
An injection molding machine for foam molding, comprising:
- a heating cylinder;
- a screw disposed in the heating cylinder;
- and
- a plurality of inlet portions provided at a plurality of positions spaced apart from each other in an axial direction in the heating cylinder and configured to introduce inert gas,
- wherein an inside of the heating cylinder is divided into a first stage on an upstream side of the screw and a second stage on a downstream side of the screw,
- wherein the first stage comprises a supply section on the upstream side of the first stage in which a resin is melted, a first compression section on the downstream side of the first stage in which a molten resin is compressed, and a first measurement section on the most downstream side of the first stage,
- wherein the second stage comprises a starvation section on the upstream side of the second stage in which a pressure of the resin is decreased, a second compression section on the downstream side of the second stage in which the molten resin is compressed, and a second measurement section on the most downstream side of the second stage, and
- wherein the inert gas from the plurality of inlet portions is supplied in the starvation section,
- wherein each of the plurality of inlet portions is provided with an opening and closing mechanism, and the opening and closing mechanism is controlled to be opened and closed based on a position of the screw,
- wherein a product P×N of an interval P of the plurality of inlet portions and a number N of the inlet portions is 0.5H or more and 1.71H or less with respect to a length H of the starvation section,
- wherein in a state in which more than two inlet portions of the plurality of inlet portions are provided, a distance of the interval P between adjacent inlet portions is identical to a distance between other adjacent inlet portions,
- wherein the plurality of inlet portions are disposed so that at least one inlet portion is present on an inner side in a range of 0.1S or more from two ends of the starvation section in a period from start to completion of a measurement, a measurement stroke S being a length of the screw moving backwards at a time of measurement,
- wherein the interval P of the plurality of inlet portions is 0.25S or more and 0.8S or less with respect to the measurement stroke S,
- wherein the product P×N of the interval P of the plurality of inlet portions and the number N of the inlet portions is 0.5S or more and 1.6S or less with respect to the measurement stroke S,
- wherein the number N of the plurality of inlet portions is two or more and four or less,
- wherein a quotient P/H of the interval P of the plurality of inlet portions and the length H of the starvation section is between 0.4 or more and 0.8 or less, and
- wherein the plurality of inlet portions are arranged eccentric to an upstream side or a downstream side with respect to the starvation section.
14 more elements
Dependencies are inferred from the claim text.