inspection and testing methods of buttons,zippers,interlinings,sewing thread,elastic etc

1. Presented by
Ms.M.VANDHANA- M.Sc
Assistant Professor
Department of Fashion Technology and
Costume Designing
Bon secours college for women
Thanjavur

2.  The cap torque tester is used in the
packaging industry to measure the opening
or closuring torque of the screwing cap. It is a
piece of specific quality control equipment
that can be placed on the production line or
in the laboratory.

3.  There are various methods by which to
evaluate zipper strength.
 The basic strength can be determined based
on the results of the following inspection
methods, from which overall strength
appropriate for respective uses can be judged
Based on JIS-S3015 and ASTM D2061）
 ※Tensile Testing Machine Conditions ―
Tensile Speed: 300 mm/min, Clamp Width:
25 mm

4. Chain crosswise strength (per 2.5cm)
An engaged zipper chain is pulled crosswise as shown at a constant speed.

5. Top stop holding strength
The lower part of an engaged zipper is held securely, then the slider pulled to the
top is pulled further up.

6. Bottom stop holding strength
The slider is pulled down to the bottom stop, and each side of the chain is pulled
outwards in opposite directions.

7. Separating unit crosswise strength
The slider lock is engaged in the middle of a chain, then each side of the chain is
pulled outwards in opposite directions.

8. Slider lock strength
The slider lock is engaged in the middle of a chain, then each side of the chain is
pulled outwards in opposite directions.

9. Slider tab pull off strength (90 degree)
Tension force is applied to both the pull-tab and the bottom of the body of an
assembled slider.
In addition to the 90°angle shown, a 45°angle is also tested.
(Tensile Testing Machine Speed: 100 mm/min)Snap and Button Testing Method

10. Direct Pull Strength (Tack Button)
A force is applied diametrically until the tack button separates from the tack or
the fabric is torn. The force at separation is reported as the holding strength.

11. Peel Off Strength
(Rivet & Burr, Snap, Eyelet & Washer)
A force is applied diametrically until the upper component separates from the
lower component or the fabric is torn. The force at separation is reported as the
holding strength.

12. Direct Pull Strength (SNAPET®)
A force is applied diametrically until the prong ring separates from the socket or
stud or the fabric is torn. The force at separation is reported as the holding strength

13.  Closure strength and durability is extremely
important to garment construction
and consumer satisfaction. Closures for
apparel and textiles products include
zippers, buttons, hooks, snap fasteners,
drawstrings, hook-and-loop fasteners, and
others

14.  Interlinings, also called interfacing, are
generally nonwoven fabrics that add
more structure and body to garment
components like collars, button plackets,
waistbands, and cuffs. Interlinings may be
fusible or sew-on. Interlining durability is
important for garment construction

15.  Sewing thread is the yarn used to combine
two or more fabric pieces together
in garments, accessories, and other textile
products. Thread encompasses the majority
of the stress and strain from movement and
needs to be strong and durable. It must resist
breaking and be compatible with the rest of
the garment in terms of color, care
instructions, and construction. Sewing thread
should be free from imperfections such
as knots, slubs, thick and thin places.

16.  Elastic waistbands are tested for fit (as per
size) and durability (loss of elasticity). The fit
is measured by the force needed to stretch
the waistband about 200 more than the
hip size (as per the size label) and bringing
back to the waist size. The durability can be
measured by stretching the waistband by 50%
and measuring the force needed to stretch it.
The loss of force in the two cases should be
less than 10% for the waistband to be
acceptable.