Fastener Tip Coating Reduces Driving Force
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Solution Overview
Problem
Powered drivers face high resistance when driving fasteners into hard materials like laminated veneer lumber, especially with longer nails, leading to increased tool temperature and incomplete nail insertion, necessitating a reduction in driving force without compromising holding power.
Innovation Solution
A coating formulation incorporating acrylic resin, amine salts of modified acrylic copolymers, ammonia salts of modified styrene acrylic polymers, water, silicone, graphite, and optional additives like solvents, surfactants, and rust inhibitors, applied at specific weight percentages to reduce friction and enhance nail penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional coatings are used on fasteners, then ease of driving is improved, but the power required to drive nails remains high and tool temperature increases
Solution Approach 1:
The patent modifies the coating composition by incorporating specific friction-reducing components (silicone and graphite) in optimized concentrations, along with amine salts of modified acrylic copolymers and ammonia salts of modified styrene acrylic polymers. These parameter changes in the coating formulation reduce the coefficient of friction between the fastener and substrate, thereby reducing the driving power required while improving ease of driving.
Solution Approach 2:
The invention uses a composite coating formulation that combines multiple materials with complementary functions: acrylic resins for adhesion, silicone and graphite for friction reduction, and various salts for surface modification. This composite approach allows the coating to simultaneously provide ease of driving, reduce driving power requirements, and maintain holding power.
2Force
If higher power is used to drive nails into hard materials, then penetration is improved, but tool temperature increases and incomplete drive occurs
Solution Approach 1:
The coating acts as an intermediary layer between the fastener and the substrate. It reduces the direct mechanical interaction and friction between the nail surface and the hard material (LVL), allowing for smoother penetration with lower forces and reduced heat generation from friction, thereby preventing tool temperature increase and incomplete drives.
3Ease of operation
If friction is reduced to ease driving, then ease of operation is improved, but holding power may be compromised
Solution Approach 1:
The coating is applied specifically to the tip region of the fastener where friction reduction is most needed during insertion. The formulation is designed to provide low friction at the interface during driving, while the resin components ensure adequate adhesion and holding power once the fastener is installed. This localized approach allows friction reduction without compromising holding power.
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 modified coating significantly decreases the force required to drive nails into substrates, maintaining or improving holding power, with optimal results achieved using 0.24% silicone and 1.2% graphite concentrations, demonstrating enhanced nail penetration and consistent performance even with 'hot' tools.
Implementation Method 1
The coating includes at least two different friction reducing components. Two preferred components are silicone and graphite.
Implementation Method 2
A coated fastener includes a fastener having a tip and a coating on the fastener, at least at the tip.
Data Source
AI summary
An ease of drive coating for a fastener is formulated from a resin having at least two different friction reducing components, such as silicone and graphite. A fastener and fastener strip include a resin formulation with at last two different friction reducing components.