Frame
A frame is a frame-shaped metal fitting attached to the opening of a clasp bag or pouch, which opens and closes left and right to close the opening.
Contents6 sections
Definition and Overview
A frame is an accessory that connects a pair of metal frames on the left and right at a central moving part, and opens and closes by pressing or pulling them apart. It holds the opening edge of the fabric and creates the opening shape and closing function for bags and pouches.
In general, "gamaguchi hardware" refers to the frame used for a clasp bag. By contrast, D rings and rectangle rings are fittings used to connect and adjust length by threading tape or a belt through them, and their role differs from a frame, which opens and closes the opening directly.
Materials and Construction
Frames are made from metals such as brass, iron, stainless steel, and aluminum, and some are finished with plating or painting on the surface. The material, plate thickness, and structure of the moving part affect strength, weight, appearance, and the feel of opening and closing.
For types with a groove for inserting fabric, a common method is to apply adhesive into the groove and secure the fabric edge. Types with sewing holes can be attached by whipping with thread. The design of the opening and closing section also varies depending on the type, including knobs, balls, and twist closures.
- Metal frames tend to provide a firm opening and closing feel, but they affect product weight.
- The color tone of plating or paint may change due to friction, sweat, moisture, or storage conditions.
- When combined with dissimilar metals or humidity, discoloration or corrosion may occur, so checking is necessary.
How to Indicate Size
Frame sizes are indicated by the width, vertical height, or overall height including the ball. However, since the measuring points and notation standards differ depending on the specifications, it is important to confirm not only the finished product width but also the internal dimensions related to the pattern.
Internal dimensions are a guideline for the width and height inside the frame where the fabric fits. For insertion types, the groove width and depth, as well as the thickness of the compatible fabric, also affect the finished result. For specifications that pass tape or fabric edges through, confirm whether the tape width and groove width are compatible.
- Check and distinguish between external and internal dimensions.
- Confirm the pattern shape, including the left and right curves, angle, and central opening section.
- For sewing-hole types, also confirm the number of holes, hole diameter, and hole spacing.
- For prototypes, check the fit with the actual thickness of the outer fabric, interfacing, and lining layered together.
Main Uses and How to Choose
Main uses include clasp pouches, wallets, handbags, and small cases. The width and shape of the frame determine the size of the opening and the look of the bag, and the suitable pattern also changes depending on whether it is round, square, or curved.
When selecting one, check whether the strength of the moving part and the reliability of the opening and closing are sufficient for the weight of the contents and the frequency of use. For large bags or uses involving heavy items, design the product so the load is not concentrated on the frame alone, and include reinforcement for the handle and body.
For products that use metal parts, also confirm in advance the impact on the needle detector process. It is important to conduct a pass test on the finished product before mass production, taking into account whether needle detector compatibility is required, the sensitivity of the needle detector used, and any other metal accessories inside the product.
Differences from Similar Terms
A frame is a fitting that holds the opening in place with a frame while allowing it to open and close. A twist lock or tuck lock is a fastener for securing a bag flap or belt, and it normally does not maintain the shape of the entire opening like a frame does.
Hook and eye closures and skirt hooks are small accessories for fastening the front opening or waist of clothing. Magnetic buttons are also used for opening and closing, but they do not have the frame structure of a frame or the distinctive opening and closing mechanism of a clasp bag.
Frequently Asked Questions
Should the pattern for a frame match the internal dimensions?
The internal dimensions are an important standard, but they are not enough by themselves. You need to reflect the curve of the frame, the position of the groove, the central opening section, and the insertion depth of the fabric. Make a trial fit on the actual item and adjust the pattern and seam allowance with the outer fabric, interfacing, and lining layered together.
Can thick fabric be used with a frame?
Whether it can be used depends on the groove width, groove depth, and fixing method. Thick fabric or fabric with interfacing layered in is difficult to fit into the groove, and forcing it in may damage the fabric edge or cause poor adhesion. Make a prototype with the actual construction and consider thinning treatments or a sewn-on type.
Can a metal frame be detected by a needle detector?
A metal frame will react to the needle detector, so operation must be managed according to the product specifications and inspection standards. Whether the frame can be managed as a normal response, or whether it can be distinguished from other metal accessories, depends on the machine conditions. Conduct a needle detector test on the finished product before mass production and set the standard.
