Molded Cup

Definition and Overview

A molded cup is a breast cup made by forming a flat sheet material into a three-dimensional shape with heat and a mold. Its feature is that it creates a smooth bust line without showing seam lines from stitching on the surface.

In general, it refers to cups for bras, but it may also be used as an integrated or removable component in camisoles, innerwear, swimwear, dresses, and more. Depending on the product, it may be supplied as a left-right pair.

Area Used and Function

It is mainly placed on the inside of the bust area of garments to cover and shape the bust. Even with a thin outer fabric, seam irregularities are less likely to show, and it helps stabilize the garment silhouette.

In garments with cups, the cup is sewn to the outer fabric or lining, or inserted into a pocket provided on the inside. The insert type allows for removal or replacement during washing, but it must be designed so it does not shift while being worn.

Materials and Types

Lightweight, resilient polyurethane foam is often used as the material. Some types have a knit fabric or nonwoven fabric laminated to the surface, and the feel against the skin, appearance, and ease of handling during sewing vary depending on the construction.

There are variations in thickness, firmness, molding depth, and outer edge shape. Thin types are suited to a natural look, while thicker types are suited to creating a sense of volume. The cup depth affects the bust measurement of the garment and the ease allowance during wear.

• The one-piece molded type has a smooth surface and is used for applications that emphasize shape retention.
• The removable type is used in cup-equipped garments that allow insertion and removal through the cup opening.
• In addition to left and right separate types, there are also designs joined at the center.

Main Applications

In lingerie, it is used in the bust area of bras and bralettes. It is suitable for cases where a low-seam appearance is desired or for specifications that are less likely to show through thin outerwear.

It is also used in camisoles with cups, tank tops, dresses, dance costumes, swimwear, and more. However, for uses involving a lot of movement, water exposure, or frequent washing, the specification should be considered, including retention and quick-drying performance.

Selection, Handling, and Sewing Precautions

When selecting, check the cup width, depth, thickness, and outer edge shape on the pattern and dress form. Rather than trying to determine the bust position with the cup alone, it is important to match it with the overall garment design, such as the underbust support area, side hold, and shoulder strap position.

When sewing in the cup, pulling it too hard or crushing it may distort the molded shape. Check whether the seam allowance and sewing position will show on the outside, and for stretchable bodices, also pay attention to waviness or shifting caused by differences in stretch amount.

High-temperature ironing or pressing may cause deformation, crushing, or surface changes. Follow the cup material composition and the care label for the entire garment regarding washing and drying conditions, and before mass production, confirm shape retention through washing and wear tests.

Frequently Asked Questions