EN
ZHTest Method: SATRA TM123
Closure strength of touch and close fasteners
January 2018
SCOPE
This method is intended to determine both the peel and shear strengths of touch and close fasteners. The loss of strength after repeated use is also assessed. The method is applicable to all types of touch and close fasteners supplied on a roll and also those forming part of completed footwear.
PRINCIPLE
2.1 Method 1 Peel strength
Both parts of a touch and close fastener are pressed together under controlled conditions. The average force required to peel them apart along their length from either end is measured with a tensile testing machine. This procedure is then repeated with the one of the parts of the fastener turned through 180°.
2.2 Method 2 Peel strength after repeated opening and closing
A touch and close fastener is repeatedly opened and closed along its length by a machine. The peel strength is then measured by repeating the test procedures described in section 2.1
2.3 Method 3 Shear strength
Both parts of a touch and close fastener are pressed together under controlled conditions with one of the parts offset to the other so that there is a standard contact area between the two parts. The maximum shear force required to pull them apart along their length in both directions is measured with a tensile testing machine. This procedure is then repeated with one of parts of the fastener turned through 180°.
2.4 Method 4 Shear strength after repeated opening and closing
A touch and close fastener is repeatedly opened and closed along its length by a machine. The shear strength is then measured by repeating the test procedures described in section 2.3.
2.5 Method 5 Peel strength of fasteners attached to footwear
A touch and close fastener, together with the part of the footwear to which it is attached, is cut from the completed footwear. The peel strength of the fastener is then measured in the direction in which failure is most likely in typical wear.
2.6 Method 6 Shear strength of fasteners attached to footwear
A touch and close fastener, together with the part of the footwear to which it is attached, is cut from the completed footwear. The shear strength of the fastener is then measured in the direction in which failure is most likely in typical wear.
REFERENCES
EN ISO 6330 - Textiles - domestic washing and drying procedures for textile testing.
EN ISO 7500-1 - Metallic materials. Calibration and verification of static uniaxial testing machines. Tension/compression testing machines. Calibration and verification of the force-measuring system.
SATRA TM158 - Washability of footwear.
HISTORY
First issued March 1989 (draft). Revised July 1992, January 2018.
AVAILABILITY
This test method is available to members and non-members.
PRICE (ex. VAT)
This price is for a printed copy of the Test Method.
- Members: £75
- Non-members: £215