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The factory process behind metal lunch boxes often involved a series of intricate steps. First, the raw materials were sourced and cut into the appropriate sizes. Next, the metal sheets underwent printing, where vibrant colors were applied to create eye-catching designs. The pieces were then shaped, bent, and fused together, creating a sturdy construction that could withstand the rigors of daily use. Finally, a protective coating was applied to guard against rust, ensuring these lunch boxes would endure for years.
metal lunch boxes vintage factory

At the core of the walking needle sewing machine is its unique walking foot design. Unlike traditional machines, the walking foot consists of multiple components that work in harmony to move the fabric evenly under the needle. The walking foot pulls the fabric from the top, while the feed dogs underneath push it from below, ensuring that all layers of fabric advance together. This is particularly beneficial when sewing thick seams or multiple layers, preventing puckering and distortion.
walking needle sewing machine


