Positive Displacement Adhesive Dispensing for Precise Cutoff

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing dispensing devices for adhesives suffer from poor cut off, less precise metering, and imprecise dispensing due to the 'stretchiness' of the material, particularly in a molten state, leading to undesired adhesive application.

Innovation Solution

A polymer processing device incorporating a dispensing valve unit configured as a positive displacement type valve, which can be pneumatic, electrically operated, solenoid operated, or hydraulically operated, to provide discrete and precise control over adhesive dispensing, addressing the issues of cut off, metering, and dispensing accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a check valve and rotatable screw are used to control adhesive flow based on pressure, then the adhesive can be dispensed through the outlet, but poor cut off and imprecise metering occur due to material stretchiness

Engineering Contradiction:

Improvedispensing precisionVSAvoidmaterial stretchiness

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The valve closes the outlet before the adhesive dispensing operation is complete, preemptively stopping the flow to prevent stretchiness from causing poor cut off and imprecise metering

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of relying on pressure-based control that allows material stretchiness to affect dispensing precision, the invention uses a valve mechanism that physically blocks the outlet to achieve precise cut off and metering

Inventive Principle:

Principle #13The other way round (Inversion)

2Manufacturing precision

If a rotatable screw provides pressure to control adhesive flow, then the adhesive can be dispensed from the outlet, but poor cut off and less precise metering result

Engineering Contradiction:

Improvecut off precisionVSAvoidflow control simplicity

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The invention replaces the rotatable screw pressure-based mechanical control system with a valve-based mechanical control system that provides superior cut off precision while maintaining operational simplicity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Quantity of substance

If pressure-based control is used with a rotatable screw and check valve, then adhesive flow can be regulated, but imprecise dispensing and poor cut off occur

Engineering Contradiction:

Improveadhesive flow rateVSAvoiddispensing accuracy

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The valve acts as an intermediary component between the adhesive source and the dispensing point, providing precise control over the flow to achieve accurate dispensing while maintaining regulated flow rate

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The device achieves controlled and accurate start and cut off of adhesive application, addressing material stretchiness even in a molten state, with precise metering and uniform adhesive distribution.

Implementation Method 1

an extruder unit configured to receive, melt, and mix an adhesive

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

a positive displacement type valve that provides discrete dispensing of the adhesive

Methodology Applied

Scientific EffectPositive displacement:

Data Source

PatentUS20260034744A1Polymer processing device and process of implementing the same

Publication Date: 2026.02.05 NORDSON CORP

AI summary

A polymer processing device includes an extruder unit configured to receive, melt, and mix an adhesive and a dispensing valve unit configured to dispense adhesive onto a substrate. Additionally, the dispensing valve unit may include a positive displacement type valve that provides discrete dispensing of the adhesive.