Bubbling

Definition and Overview

Bubbling is a phenomenon in which local lifting occurs between the outer fabric and fusible interlining, or within the structure of the fusible interlining. Depending on how the light hits it, it appears as small bulges or wrinkles, and it is a quality defect that is likely to become a problem in areas where interlining is used to shape the garment, such as collars and front edges.

It is not simply a condition where the outer fabric is sagging; it is also related to insufficient adhesion of the adhesive and changes in the textile caused by heat or pressure. It may occur together with insufficient peel strength, but the emphasis is on the visible bulging.

Areas Where It Commonly Occurs and Its Effect on Function

Bubbling is likely to occur in areas where fusible interlining is used to provide firmness and shape, such as collars, collar stands, cuffs, front plackets, facings, front edges, pocket openings, and belts. The interlining may not fully deliver its intended functions of shape retention and stability during sewing.

It is especially noticeable in smooth textiles with little surface variation, lightweight fabrics, and glossy fabrics, where even slight lifting stands out. Since it may become apparent after bending during wear, washing, or cleaning, checking before product release is important.

Materials and Combinations That Cause It

If the stretch, shrinkage, thickness, firmness, or structure of the outer fabric and interlining do not match, differences in how they move after bonding can lead to bubbling. Care is needed when using a firm interlining with a thin, soft outer fabric, or an interlining that does not follow the stretch of a stretchable outer fabric well.

If the outer fabric is sensitive to heat, raising the temperature or pressure in an attempt to achieve sufficient adhesion may cause surface shrinkage, shine, or changes in hand. On the other hand, if the conditions are insufficient, the adhesive may not melt or penetrate fully, causing lifting or peeling.

• For woven fabrics, consider woven interlining or nonwoven interlining that matches the thickness and hand of the outer fabric.
• For knits and stretch materials, consider knit interlining or similar options with good stretch followability.
• For outer fabrics with a lot of fuzz or unevenness, check the type of adhesive and its application condition according to the state of the bonding surface.

Selection and Pre-Check

Choose interlining based on both the desired shape retention and the hand of the outer fabric, avoiding interlining that is excessively thick or firm relative to the outer fabric. Matching the grain of the interlining to the grain of the outer fabric is fundamental. If it will be used on the bias or in a direction with stretch, check whether deformation or lifting occurs.

Before mass production, carry out test bonding using the actual outer fabric, interlining, cutting direction, and bonding conditions. Check for surface lifting, hand, and any peeling not only immediately after bonding but also after sufficient cooling, after bending, and, if possible, after the expected washing or cleaning process.

Precautions in Bonding and Sewing

In bonding press work, manage the temperature, pressure, time, and condition of the pressing surface according to the combination of interlining and outer fabric. Because bonding is less likely to stabilize if the material is moved or stacked strongly immediately after pressing, it is important to cool it properly while flat.

During sewing, misalignment, pulling, and excessive pressing with the iron can encourage lifting. Fine details such as collar corners and front edges are also affected by seam allowance thickness and trimming cuts. If bubbling is observed, check the cause through the cutting, bonding, sewing, and finishing processes, not just the interlining.

Frequently Asked Questions

How is bubbling different from peeling?

Bubbling is a visible phenomenon of local bulging or lifting in the area where fusible interlining has been applied. Peeling refers to the state in which the bond between the outer fabric and the interlining comes apart. Bubbling may involve peeling, but it can also occur due to factors that cannot be explained by peeling alone, such as differences in surface shrinkage or a mismatch in firmness.

Can I increase the bonding temperature to prevent bubbling?

Simply raising the temperature is not always appropriate. Depending on the outer fabric, it may cause shrinkage, shine, discoloration, or a loss of hand. Based on the specified conditions for the interlining, determine the settings by combining temperature, pressure, and time, and perform test bonding and post-cooling appearance checks.

If bubbling is found after bonding, can it be fixed by re-pressing?

If slight lifting is caused by insufficient bonding, it may improve with re-pressing under suitable conditions. However, if the outer fabric or interlining has been deformed by heat, if the cause is a difference in shrinkage, or if the adhesive is uneven, it may not improve. For mass-produced items, identify the cause before deciding on the corrective action.