Combustible Sleeve With Textile Insert Prevents Fracture
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Solution Overview
Problem
Combustible sleeves for firearms are sensitive to fracture during handling, leading to potential breakage and escape of propellant powder, posing a security risk, and existing reinforcement methods increase the thickness of the sleeve wall, reducing its usable volume for powder absorption.
Innovation Solution
A cylindrical sleeve with a stretchy insert embedded in the coat wall, made from materials like polyurethane-cotton mixing yarn, designed to maintain the sleeve's mechanical strength while preventing crack formation and powder leakage, allowing for a thinner wall and increased powder capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the coat wall is made thinner to increase powder capacity, then the usable volume for powder absorption increases, but the mechanical strength and fracture resistance decrease
Solution Approach 1:
The sleeve combines combustible fiber material (nitro cellulose, cellulator) with a non-combustible textile insert (cotton yarn, polyurethane-cotton mixing yarn) to create a composite structure. The textile insert provides mechanical reinforcement and fracture resistance, while the combustible material maintains its primary function. This composite approach allows the coat wall to be thinner while maintaining sufficient strength.
Solution Approach 2:
The reinforcement is applied locally through an embedded textile insert rather than uniformly throughout the entire coat wall. The insert is positioned at critical locations where fracture resistance is most needed, allowing the rest of the coat wall to be thinner and maximize powder capacity while providing targeted strength enhancement.
2Strength
If multi-layer reinforcement is added to increase fracture resistance, then the mechanical strength improves, but the coat wall thickness increases and usable volume decreases
Solution Approach 1:
The textile insert is embedded within the combustible coat wall material, with the insert nested inside the sleeve structure. This nested configuration allows the reinforcement to be integrated within the existing wall thickness rather than adding external layers, maximizing the usable volume for powder absorption while maintaining fracture resistance.
3Reliability
If traditional reinforcement methods are used to prevent breakage, then the reliability improves, but the manufacturing complexity and production time increase
Solution Approach 1:
The manufacturing process merges the insertion of the textile insert with the existing coat wall formation process. The insert is placed into the sieve shape before the combustible material is applied, combining two operations (insert placement and coat wall formation) into a single integrated manufacturing step, thereby reducing overall process complexity and time.
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 sleeve achieves enhanced mechanical strength and reduced sensitivity to fracture, ensuring safe handling and efficient powder retention without increasing the wall thickness, thereby maintaining a larger usable volume for propellant absorption.
Implementation Method 1
the insert now has the function of keeping the resulting cracks and break openings in the coat wall closed compared to the exit of the blades of the propellant
Implementation Method 2
With the help of negative pressure, the sieve shape sucks the fiber porridge
Implementation Method 3
at least temporarily heats up, which makes the sleeve form stable
Data Source
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AI summary
The invention relates to a cylindrical sleeve (6) for receiving propellant powder (4) with a dimensionally stable jacket wall made of combustible, felted fiber material and an insert (5) made of a textile fabric in the jacket wall, and a method for its manufacture.