Powder storage apparatus, melt kneader, powder storage method, and production method for thermoplastic resin composition

Patent metadata

Field	Value
Publication number	US-12202174-B2
Application number	US-202017433208-A
Country	US
Kind code	B2
Filing date	Feb 25, 2020
Priority date	Feb 26, 2019
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

A powder storage apparatus 41 includes: a container 42 having a powder inlet 18 A, a powder outlet 10 A, and a gas outlet 18 B; and a tube 70 connected to the powder inlet 18 A. If A S [m 2 ] is a cross-sectional area of a cross section perpendicular to an axis of the tube 70 at a bottom end 70 b of the tube 70 and A B [m 2 ] is a cross-sectional area of the gas outlet 18 B, the following expression is satisfied.

A S /A B <4.

First claim

The invention claimed is:

1. A powder storage apparatus comprising: a container having a powder inlet, a powder outlet, and a gas outlet; and a tube connected to the powder inlet, wherein A s is a cross-sectional area of a cross section perpendicular to an axis of the tube at a bottom end of the tube, A B is a cross-sectional area of the gas outlet, and A s /A B <0.3.

2. The powder storage apparatus according to claim 1 , wherein an angle formed by a horizontal plane and the axis of the tube is 40 to 90°.

3. The powder storage apparatus according to claim 1 , wherein at least a part of the bottom end of the tube is positioned at the same height as the powder inlet of the container or below the powder inlet.

4. A powder storage method using the powder storage apparatus according to claim 1 , the method comprising:
a step of causing a powder supplied from a top end of the tube to flow down within the tube to be supplied into the container from the bottom end of the tube.

5. The powder storage method according to claim 4 , wherein if a supply flow rate of the powder supplied into the container via the tube is M [kg/s], a bulk density of the powder is ρ p ′ [kg/m 3 ], and a terminal velocity of the powder is U r [m/s], the following expression is further satisfied
A S >( M /(ρ p ′U r )).

6. A melt kneader comprising:
the powder storage apparatus according to claim 1 ;
a cylinder connected to the powder outlet; and
a screw provided in the cylinder.

7. A production method for a thermoplastic resin composition using the melt kneader according to claim 6 , the method comprising:
a step of supplying thermoplastic resin powder into the container from the bottom end of the tube by supplying the thermoplastic resin powder from the top end of the tube and causing the thermoplastic resin powder to flow down within the tube;
a step of supplying additive powder to the container;
a step of supplying the thermoplastic resin powder and the additive powder in the container into the cylinder from the powder outlet; and
a step of melting and kneading the thermoplastic resin powder and the additive powder with the screw to obtain the thermoplastic resin composition.

8. The powder storage apparatus according to claim 2 , wherein at least a part of the bottom end of the tube is positioned at the same height as the powder inlet of the container or below the powder inlet.

Assignees

• Sumitomo Chemical Co

Inventors

• Ishihara Nozomi
• Fukunaka Tadashi

Classifications

• B29C31/02

  Dispensing from vessels, e.g. hoppers {(into a mould cavity B29C31/04; large containers characterised by discharge means B65D88/28, B65D88/54)} · CPC title

• B29B7/80

  Component parts, details or accessories; Auxiliary operations (B29B7/22, B29B7/58 take precedence {; cleaning mixers B01F35/145}) · CPC title

• B29B7/90

  Fillers or reinforcements {, e.g. fibres} · CPC title

• B29B7/42 Primary

  with screw or helix · CPC title

• B29B7/603 Primary

  in measured doses, e.g. proportioning of several materials · CPC title