Cartridge Primer Assembly Using Slurry Drying for Safer Dosing
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Solution Overview
Problem
The manufacturing process of Boxer type primers for firearm cartridges is hazardous due to the volatility of the primer composition, leading to injuries and fatalities despite strict safety measures.
Innovation Solution
A primer assembly method using a primer cup and anvil design that allows for the introduction of a slurry containing primer composition, which is then dried to form a deposit in the primer gap, eliminating the need for manual handling of volatile materials and enabling automation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual insertion and pressing of wet primer composition into volumetric measure plates and then into primer cups is used, then the primer composition can be precisely measured and positioned, but the process becomes extremely hazardous due to the volatility of the primer composition
Solution Approach 1:
The invention extracts the hazardous wet primer composition from the manual handling process by using a dry powder composition that is applied through a brush or applicator, eliminating the need for volumetric measure plates and manual pressing operations while maintaining precise application
Solution Approach 2:
The invention changes the physical state of the primer composition from wet (liquid-based) to dry (powder-based), fundamentally altering the handling characteristics and eliminating volatility-related hazards while preserving measurement and positioning precision through controlled application methods
2Reliability
If a protective paper layer is placed between the anvil and the primer composition, then accumulation of energetic primer compounds on presses and punches is prevented, but an additional manufacturing step and material are required
Solution Approach 1:
The invention removes the protective paper layer entirely by using a dry powder composition that does not adhere to metal surfaces or equipment, eliminating the need for barriers and simplifying the manufacturing process while maintaining equipment protection
Solution Approach 2:
The invention replaces the reusable paper barrier with a dry powder composition that inherently prevents equipment accumulation through its non-sticky properties, eliminating the need for disposable paper layers and reducing waste
3Reliability
If the primer composition is dried to eliminate all liquid medium, then the primer is ready for use, but the process requires extended drying time and controlled environment
Solution Approach 1:
The invention inverts the traditional approach by starting with a dry powder composition rather than a wet mixture, eliminating the need for a drying step entirely and allowing immediate use after application without environmental control requirements
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 method ensures a safer and more controlled process for primer assembly, reducing the risk of accidents and enabling precise, automated production of primers.
Implementation Method 1
The slurry in the primer cup is dried to remove the liquid carrier and leave a deposit of the primer composition in the primer gap
Data Source
AI summary
A method of assembling a primer for a firearm cartridge including the steps of providing a primer cup including a cup base with a circular sidewall extending perpendicularly upward from a perimeter edge thereof, to a rim. Providing an anvil having an anvil base and pressing the anvil into the primer cup with the anvil base spaced apart from the cup base to form a primer gap therebetween. Providing a slurry including a primer composition and a carrier liquid and introducing a controlled volume of the slurry into the primer cup over the anvil. Drying the slurry in the primer cup to remove the liquid carrier and leave a deposit of the primer composition in the primer gap.