Dispenser for two-component spray polyurethane form that are free of gaseous blowing agents

Patent metadata

Field	Value
Publication number	US-10035155-B2
Application number	US-201415327283-A
Country	US
Kind code	B2
Filing date	Sep 15, 2014
Priority date	Sep 15, 2014
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A dispenser comprises a housing defining at least three feed channels, a spool valve with a spool defining at least three flow passages, a deformable sealing plug in at least two of the feed channels and in sealing orientation with both the housing and the spool, and a nipple in at least the two feed channels of the housing comprising sealing plugs; wherein the spool can reversibly rotate between an open orientation and a closed orientation can dispense two-component form formulations that are free of gaseous blowing agents.

First claim

What is claimed is:

1. A dispenser comprising:
(a) a housing with a feed end and an opposing dispensing end, the feed end having defined therein at least three feed channels and the dispensing end having defined therein at least one dispensing channel;
(b) a spool valve mounted in the housing between the feed end and dispensing end, the spool valve comprising a spool with at least three separate flow passages defined through the spool each flow passage having a feed end opening and a dispensing end opening and at least four gasket grooves defined circumferentially around the spool with a gasket residing in each gasket groove so that each gasket residing in a gasket groove presses against the spool and housing to form a seal around the circumference of the spool with a gasket groove defined on each side of the three flow passage openings and a gasket in each of the four gasket grooves;
(c) a deformable sealing plug in at least two feed channels positioned so as to be in a sealing orientation with the housing about the feed channel so as to prevent fluid communication through the feed channel around the sealing plug, the sealing plug having opposing spool and feed ends and a flow channel extending through the sealing plug and through the opposing ends, wherein the spool end of the sealing plug is pressing against and is in sealing contact with the spool, the entire sealing plug being elastomeric and deformable;
(d) a nipple in each of at least the two feed channels of the housing containing the deformable sealing plugs and extending inside and out from the feed end of the feed channels, the nipples having opposing entrance and exit ends and a flow channel extending through each nipple, including through the exit and entrance ends, the nipples oriented such that the exit end of a nipple presses directly against the feed end of a sealing plug within the feed channel of the housing and such that the flow channels of sealing plug and nipple are in fluid communication, the nipples being free of screw threading that screws the nipple into the feed channel;

wherein the spool can reversibly rotate between: (i) an open position where each of three passages through the spool aligns in fluid communication with a feed channel and the dispending channel of the housing with at least two of the passages in the spool achieving fluid communication with a flow channel of the housing through a flow channel of a sealing plug and nipple; and (ii) a closed position where the passages through the spool are not in fluid communication with flow channels of the sealing plugs in at least two of the feed channels; and wherein each of the three passages through the spool is entirely enclosed within the spool except for feed and opening and the dispensing end opening of the passages.

2. The dispenser of claim 1 , wherein the spool end of the sealing plugs have a profile that generally matches that of the spool profile and each sealing plug is aligned in a feed channel so that the profile of the spool end of the sealing plug is aligned and conforms to the profile of the spool.

3. The dispenser of claim 2 , further characterized by the sealing plug having alignment features that facilitate positioning of the sealing plug in a particular orientation with respect to the housing.

4. The dispenser of claim 1 , further characterized by the deformable sealing plug being made of elastomeric polymer.

5. The dispenser of claim 1 , wherein the sealing plugs frictionally fit into the feed channels of the housing and wherein the sealing plugs are free of threading for screwing into the feed channels of the housing.

6. The dispenser of claim 1 , wherein the feed channels of the housing that contain the deformable the sealing plugs are each free of threading for screwing an element into the feed channel.

7. The dispenser of claim 1 , further characterized by two of the feed channels being coplanar and the third feed channel being non-coplanar with the other two and wherein the spool is cylindrical with two of the flow passage extending radially through the spool and capable of aligning with the two coplanar feed channels and the third flow passage entering in a non-coplanar orientation with the other feed channels but exiting the spool aligned in a linear orientation with respect to the other passages such that when the spool is oriented in an open orientation the entrances to the flow passages each align with a different one of the feed channels and fluids flowing through the feed channels proceed through the passages of the spool so as to exit the spool passages aligned along a plane.

8. The dispenser of claim 1 , further comprising a trigger attached to the spool so that when the trigger is moved in a first direction the spool rotates to an open orientation and aligns the flow passages of the spool into fluid communication with the feed channels of the housing and when the trigger is moved in a direction opposite to the first direction, the spool rotates into a closed orientation so that the flow passages of the spool are not in fluid communication with the feed channels of the housing.

9. The dispenser of claim 1 , further characterized by having a bleed groove defined circumferentially around the spool between two gasket grooves containing gaskets, the bleed groove being in fluid communication with one of the flow passages through the spool.

10. A method of using the dispenser of claim 1 , the method comprising: (a) simultaneously supplying under pressure: (i) a liquid isocyanate component into a first feed channel of the housing through the flow channels of the nipple and plug residing in the first feed channel; (ii) a liquid polyol component into a second feed channel of the housing through the flow channels of the nipple and plug residing in the second feed channel; and (iii) a gas into a third feed channel of the housing; (b) position the spool of the dispenser to allow the liquid isocyanate component, the polyol component and the gas to flow through separate passages through the spool; and (c) dispensing a combination of the isocyanate component, polyol component and gas out from the dispensing channel of the housing.

Assignees

• Dow Global Technologies Llc

Inventors

• Heckert Michael F
• Schulz Peter J
• Schroer Daniel R
• Turpin Matthew J
• Stewart Gregory T
• Cai Jie

Classifications

• B05B7/0416 Primary

  with arrangements for mixing one gas and one liquid · CPC title

• B05B15/025

  Operations & Transport · mapped topic

• B05B7/02

  Spray pistols; Apparatus for discharge (for spraying particulate material B05B7/14; with means for heating the material to be sprayed B05B7/16; with means for supplying fluent material to a discharge device B05B7/24) · CPC title

• B29B7/7438

  Mixing guns, i.e. hand-held mixing units having dispensing means (B29B7/761, B29B7/7678 take precedence) · CPC title

• B05B15/55

  using cleaning fluids · CPC title