Oxidation-Free Adhesive Thread Coating for Flexible Throughput
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Solution Overview
Problem
Existing adhesive thread devices for joining wooden workpieces face issues such as oxidation of the adhesive, contamination by wood dust, and synchronization of throughput speeds with melting temperatures, leading to inefficiencies and potential machine sticking or carbonization.
Innovation Solution
A device and method for producing an adhesive thread in an oxidation-free manner, using a supply device for a crude thread and an adhesive tank with a main heater and storage zone to prevent oxygen exposure, allowing for precise calibration and wide range of throughput speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adhesive is stored in an open basin for melting, then the adhesive can be continuously supplied, but the adhesive surface oxidizes and contaminates with wood dust
Solution Approach 1:
The patent applies an inert atmosphere principle by filling the adhesive basin with nitrogen gas to create an oxygen-free environment. This prevents oxidation of the adhesive surface while maintaining continuous melting and supply operations. The nitrogen atmosphere eliminates the harmful oxidation effect without compromising productivity.
2Productivity
If heating temperature is increased to maintain adhesive flow, then adhesive supply is ensured, but carbonization occurs and machine sticking happens
Solution Approach 1:
The patent changes the atmospheric parameter from oxygen-containing air to inert nitrogen atmosphere. This parameter change allows the adhesive to be maintained at optimal melting temperature without undergoing oxidative carbonization. The inert atmosphere enables lower temperature operation while still ensuring continuous adhesive flow, thereby preventing carbonization and machine sticking.
3Manufacturing precision
If throughput speed is synchronized with melting temperature, then adhesive application quality is maintained, but production flexibility is reduced
Solution Approach 1:
The inert nitrogen atmosphere provides a stable thermal environment that prevents adhesive degradation. This stability allows the adhesive to maintain consistent viscosity and flow characteristics across a wider range of temperatures and speeds. Consequently, the system can vary throughput speeds more flexibly while still achieving quality adhesive application, as the inert atmosphere prevents the adhesive from degrading under different operational conditions.
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 solution enables secure joining of workpieces without oxidation-related issues, reduces cleaning efforts, allows for easy restarts without adhesive residue, and prevents vapor escape, ensuring user safety and efficient production.
Implementation Method 1
a lower portion forms an activation zone in which the adhesive is surface-melted in an oxidation-free manner
Implementation Method 2
a main heater is provided, which is arranged at a lower portion of the adhesive tank
Implementation Method 3
an additional heater is preferably arranged on the closed receptacle to maintain the molten adhesive in the closed receptacle at a predetermined processing temperature
Implementation Method 4
the adhesive granulate, which is stacked above the molten adhesive, safely prevents penetration of air and thus also prevents oxygen coming up to the molten adhesive
Implementation Method 5
at least one outlet opening for discharging an adhesive thread which is made of the crude thread and adhesive residues adhering to the crude thread on the entire outer surface when passing through in the molten adhesive
Data Source
AI summary
The present invention relates to an adhesive thread device for producing an adhesive thread, comprising a supply means for supplying an adhesive-free crude thread, an adhesive tank for receiving and storing an adhesive granulate, a main heater arranged at a lower portion of the adhesive tank to define an activation zone of the adhesive tank in which the adhesive granulate is surface-melted, a closed receptacle substantially horizontally arranged, which is arranged at the activation zone of the adhesive tank with a first end, wherein the closed receptacle comprises at least one inlet opening for supplying, and at least one outlet opening for withdrawing the crude thread, and wherein, when passing the crude thread through the closed receptacle, the crude thread is wetted with adhesive on its entire outer surface in an oxidation-free manner. Furthermore, the present invention relates to a device for joining workpieces as well as a method for producing an adhesive thread and a method for joining workpieces.