Patent ID: 6944949

Claim:
A method of making a motor vehicle wheel arch comprising both a body of thermoplastic material provided with an opening, and a mat closing said opening and fixed to the body by strips of thermoplastic material secured to said body, the method comprising injecting the strips of thermoplastic material onto the mat, allowing them to solidify in contact with said mat, and forming on at least one strip of thermoplastic material an edge of thickness that is reduced relative to the thickness of the remainder of the strip, wherein, in cross-section, the thickness of the edge is related to the width l of the edge by a mathematical function f such that: ∫ 0 ℓ ⁢ f ⁡ ( x ) ⁢ ⁢ ⅆ x ≥ h 2 where h is the height of the edge at its junction with the strip.