8-ring And 9-ring
8-ring and 9-ring are small rings used on straps for items such as bras, for length adjustment and strap connection.
Contents7 sections
Definition and Overview
8-rings and 9-rings are accessories primarily used to attach to the shoulder straps of lingerie. 8-rings are used to thread the strap through after folding it over, allowing for length adjustment while maintaining its position through friction. 9-rings are used at the connection points and fold-over sections of the strap.
The name originates from the fact that its external shape resembles the numbers 8 or 9. However, there are differences in the usage of shapes and part names depending on the manufacturer and supplier. In specifications, it is important to check the shape not only by name but also by drawing or physical sample.
Materials and structure
The materials used are resin and metal. Resin masks are lightweight, gentle on the skin, and some are dyeable. Metal masks offer good strength even in thin shapes, and are often plated or painted to enhance their appearance.
8-rings typically have a central divider, allowing the tape to be passed through multiple times to maintain its length. 9-rings often have a shape combining a loop and a divider, serving to connect the ends of the strap. The roundness of the corners and the presence or absence of burrs affect the wearing comfort.
How to express size
Sizes are generally expressed by the inner dimensions of the area through which the strap or tape passes, or by the corresponding tape width. Even if the outer dimensions are the same, the ease of threading the tape will vary depending on the thickness of the divider rods and the allowance for folding the tape.
When selecting, use the finished width of the strap elastic band or tape to be used as a criterion. If the width is too narrow, it will move around easily within the component, and if it is too wide, it will be difficult to thread through, and there is a risk of excessive friction during adjustment or damage to the tape ends.
- Internal dimensions of the component and compatible tape width
- The thickness of the divider rod and the ease of threading the tape through it.
- The thickness of the component and the amount of the strap fold.
- Front and back and orientation when using with left and right straps
Main applications
These are used in products such as bras, bralettes, camisoles, slips, and swimwear that allow for adjustable shoulder strap length. They are functional components that allow for adjusting the fit by changing the strap length to suit the wearer's physique and position.
In lingerie, 8-ring and 9-ring fasteners are sometimes combined to create an adjustment mechanism while connecting the strap on one side. Depending on the applications, transparent resin, dyed materials, or materials with a metallic appearance are selected.
How to choose and points to note
Since the strap is constantly under tension, we will verify that its strength is appropriate for the product weight, expected elongation, and frequency of attachment and detachment. If using thick tape or strong elastic band, we will test prototypes to ensure that there is no deformation or cracking of parts, no detachment of the divider rods, and no slippage at the adjustment position.
For metal parts, pay attention to rust caused by sweat, washing, and storage conditions, as well as wear and discoloration of the plating. For resin parts, check for cracks and deformation caused by chemicals, heat, and aging. For light-colored fabric and straps, contamination and color transfer from the metal surface will also be evaluated.
For products that require metal detection, the locations of metal parts, their reaction to metal detectors, and procedures for handling foreign object contamination are shared with the production process in advance. In addition to checking for the presence of metal, we also check for placement on the side that comes into contact with the skin, mobility after sewing, and snagging due to burrs.
Differences from similar terms
The slide adjuster" is often used as a general term for parts that adjust the length of belts, bag straps, etc., and may have a similar structure to an 8-ring. On the other hand, 8-rings and 9-rings are sometimes specifically referred to as small strap parts for lingerie.
circular ring and rectangle ring are primarily used as connecting loops and generally do not have the function of adjusting the strap length in increments on their own. The term "bra adjuster" is used to refer to the entire strap adjustment component, including 8-ring and 9-ring types.
FAQ
How do you differentiate between using 8-ring and 9-ring sets?
The 8-ring is primarily used to fold and thread the strap through, allowing for length adjustment. The 9-ring is used to connect the end of the strap and to hold the folded portion in place. However, there are differences in the usage of the shape names, so please check the specifications for individual part photos, internal dimensions, and threading instructions.
Should I choose an 8-ring with the same inner width as the strap?
Generally, you choose an inner dimension that corresponds to the width of the strap you will be using, but this alone is not enough. The ease of threading and the holding power will vary depending on the thickness of the tape, its elasticity, the amount of fold, and the thickness of the divider rod, so you should check it with the actual strap threaded through.
Can metal meter readings be performed using 8-ring or 9-ring metering devices?
While a needle detection process can be set up even for products using metal parts, the system will react to the parts themselves. We will manage the system based on the reaction at the designated attachment point and confirm with the manufacturer that it can distinguish between metal and foreign objects such as broken needles. We will also consider using resin parts if necessary.
