Needle Penetration

Definition and Overview

Needle penetration is an expression used mainly for needles, and the way it is perceived varies depending on the sharpness of the needle point, the smoothness of the shaft, the surface finish, and other factors. A state in which there is little resistance when passing a needle through textile is said to have good needle penetration.

A needle with good needle penetration helps reduce the force needed to push it in during hand sewing and makes it less likely to create holes or puckering in delicate textile. However, actual ease of sewing also depends on the combination of the textile, yarn, and the needle’s thickness and shape.

How to Use and How to Check

When selecting a needle, test sew on a scrap of the textile to be used and check whether the needle passes through smoothly and whether there are any damage or pulled yarn around the needle hole. Pre-checking is especially important for thin fabrics, closely woven textile, and delicate knits.

For hand sewing, it is important to insert the needle straight into the textile and not force it in strongly just because resistance feels high. On a sewing machine, matching the needle type and size to the textile, and adjusting thread tension and sewing speed as well, makes it easier to reduce visible needle holes and sewing defects.

• Before starting to sew, check the needle point for bending, blunting, and rust.
• A needle that is too thick for the textile can cause hole marks or thread breakage.
• If you feel resistance or hear unusual noise from the needle, do not keep using the same needle; consider replacing it.

Needle Types and How to Choose

The feeling of needle penetration changes greatly depending on the shape and thickness of the needle point. For woven fabrics, it is generally best to choose a needle with a sharp tip, while for stretchy knits and other knitted fabrics, choose a rounded needle point that is less likely to cut the fibers, so that stress on the textile is reduced.

For thick fabrics or layered sections, a needle with enough thickness and strength to penetrate the textile is necessary. On the other hand, thin fabrics are suited to thinner needles, but needles that are too thin can bend easily. In addition to textile thickness, also consider density, whether there is any coating, and the overlap at the sewing area when choosing.

Needles with a smoothly finished surface may be designed with good needle penetration in mind. However, do not judge suitability by the finish alone; check comprehensively whether the needle point, needle diameter, and type are appropriate for the sewing target.

Care and Safety Notes

Store needles away from moisture and dirt, and after use wipe them lightly with a dry cloth before returning them to a needle cushion or case. Rust and roughness on the surface can worsen needle penetration and may damage the textile, so replace needles that are in poor condition.

If you force a needle out or press hard with your fingertips, it can lead to needle breakage or injury. When sewing hard sections or thick layered sections, use a thimble or similar tool, and dispose of broken needles and used needles safely so they do not scatter.

Differences from Similar Terms

Needle penetration is a term that describes how the needle feels as it passes through textile. Sewability is a broader sewing property that evaluates whether skipped stitches, thread breakage, puckering, and similar problems are less likely to occur when sewing textile.

Needle hole refers to the hole itself formed in textile by the needle. Even if needle penetration is good, if the needle is too thick or the needle point type does not match, the needle hole may become noticeable.

Frequently Asked Questions