Method and injection molding system for producing intumescent reaction plastic molded parts and reaction plastic molded part

Patent metadata

Field	Value
Publication number	US-10427337-B2
Application number	US-201414902115-A
Country	US
Kind code	B2
Filing date	Jul 3, 2014
Priority date	Jul 3, 2013
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A method for producing an intumescent plastic molded part that consists of a reaction plastic which contains intumescent additives and glass fibers is disclosed. The method includes providing an additive mixture which is composed of the intumescent additives and the glass fibers and mixing the additive mixture and components of the reaction plastic, where a homogeneous mass is obtained. The homogeneous mass is introduced into an injection mold and the homogeneous mass is hardened in the injection mold. A injection molding system for producing the intumescent plastic molded part and an intumescent plastic molded part are also disclosed.

First claim

The invention claimed is:

1. A method for producing an intumescent plastic molded part that consists of a reaction plastic which contains intumescent additives and glass fibers, comprising the steps of:
introducing the glass fibers into the intumescent additives in a mixing device and mixing the glass fibers evenly through the intumescent additives in the mixing device to form an additive mixture;
introducing components of the reaction plastic by a pump into a mixing chamber through a first inlet of the mixing chamber;
introducing the additive mixture from the mixing device into the mixing chamber through a second inlet of the mixing chamber;
flowing a mass of the components of the reaction plastic and the additive mixture out of the mixing chamber through an outlet of the mixing chamber and into an injection mold; and
hardening the mass in the injection mold.

2. The method according to claim 1 , wherein the glass fibers have a diameter of 4 μm to 10 μm and a length of 3 mm to 10 mm.

3. The method according to claim 1 , wherein a mass or a volume share of the additive mixture amounts to between 0.5% and 5% relative to the intumescent plastic molded part.

4. The method according to claim 1 , wherein the produced intumescent plastic molded part is a foamed plastic molded part.

5. The method according to claim 1 , further comprising the step of foaming the mass in the injection mold.

Assignees

• Hilti Ag

Inventors

• Muenzenberger Herbert

Classifications

• B29K2105/0026

  Flame proofing or flame retarding agents · CPC title

• B29K2105/04

  cellular or porous · CPC title

• B29C44/3442 Primary

  Mixing, kneading or conveying the foamable material (mixing plastics B29B7/00; mixing in general B01F) · CPC title

• B29B7/90

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

• B29B7/7615

  characterised by arrangements for controlling, measuring or regulating, e.g. for feeding or proportioning the components · CPC title