The process for lockstitching the seams of the washable incontinence underpad, or any textile product, involves using a sewing machine equipped with lockstitch technology to create strong and secure seams. Here's a general overview of the process:
1. Fabric Placement:
Position the layers of fabric that need to be joined together, ensuring that they are aligned correctly. In the case of the underpad, this typically involves aligning the top layer (often made of cotton or a blend) with the absorbent core and the bottom waterproof layer.
2. Seam Marking:
Mark the seam lines on the fabric as a guide for sewing. These marks help ensure that the stitching is straight and aligns with the design of the underpad.
3. Starting the Stitch:
Position the fabric layers under the sewing machine's presser foot. Lower the presser foot to hold the fabric in place.
Begin sewing by gently pressing the foot pedal or engaging the start button, depending on the machine's design. The needle will penetrate the fabric, starting the stitching process.
4. Sewing the Seam:
Guide the fabric under the presser foot as you sew along the marked seam lines. Keep the fabric aligned with the needle to maintain straight stitching.
The lockstitch sewing machine will create stitches by interlocking the upper thread (coming from the needle) with the bobbin thread (from the bobbin beneath the fabric) at each stitch point.
5. Maintaining Consistency:
Maintain a steady sewing pace to ensure even stitches. Be mindful of the seam's alignment and any curves or corners in the design.
6. Backstitching:
At the beginning and end of the seam, engage the backstitch function on the sewing machine if needed. Backstitching involves sewing a few stitches in reverse to secure the seam's ends and prevent unraveling.
7. Cutting Threads:
Trim excess thread tails using scissors or a thread cutter.
8. Securing Ends:
Some sewing machines may have an automatic thread securing function that knots the threads at the beginning and end of the seam. Alternatively, you can tie knots or use other securing methods.
9. Quality Control:
Inspect the sewn seam for consistency, straightness, and any irregularities. Check for loose threads or skipped stitches, and make any necessary adjustments or repairs.
The lockstitching process is integral to creating durable and reliable seams in the washable incontinence underpad. Properly sewn seams help ensure that the underpad can withstand the rigors of use and laundering.
Here's a specific method flow for testing the absorbency, wicking capacity, and overall performance of washable incontinence underpad
1. Sample Preparation:
- Obtain representative samples of the reusable incontinence underpads to be tested.
- Ensure that the samples are clean, free from defects, and have been pre-washed according to any manufacturer recommendations.
2. Absorbency Testing:
- Cut standardized test specimens from the underpad material (e.g., rectangular shapes of specified dimensions).
- Weigh each dry test specimen to determine the initial weight (W1).
- Place the test specimen on a flat, horizontal surface.
- Saturate the test specimen with a known volume of synthetic urine or water using a controlled delivery system.
- Allow the test specimen to absorb the liquid for a specified time (e.g., 5 minutes).
- Weigh the test specimen again to determine the weight after absorption (W2).
- Calculate the absorbency by subtracting W1 from W2.
3. Wicking Capacity Testing:
- Cut a rectangular strip of the underpad material to be used for wicking capacity testing.
- Prepare a reservoir of synthetic urine or water.
- Attach one end of the strip to the reservoir, ensuring it is fully immersed in the liquid.
- Allow the liquid to wick along the strip for a specified time (e.g., 30 minutes).
- Measure and record the distance the liquid has wicked along the strip.
4. Fluid Distribution Testing:
- Place the underpad on a flat, horizontal surface.
- Apply a controlled volume of liquid (synthetic urine or water) to a defined area of the underpad surface.
- Allow the liquid to spread and distribute across the underpad surface.
- Assess the uniformity of liquid distribution and any pooling or uneven absorption.
5. Reusability and Durability Testing:
- Subject the underpad to simulated wear and washing cycles as specified by ISO or other relevant standards.
- Assess the underpad's physical integrity, absorbency, and wicking capacity after a specified number of cycles.