3M™ Loop Fastener SJ3571
Handling/Application Information
Directions for Use
Attachment Techniques
The following information is intended to assist the designer considering the use of 3M hook and loop fasteners. System product performance depends upon a number
of factors, including the fastener (material, adhesive and area), application method, surface characteristics (material, texture and cleanliness), environmental conditions
(moisture, ultraviolet and temperature exposure) and the time it is expected to support a given load. Because many of these factors are uniquely within the user’s
knowledge and control, it is required that the user evaluate 3M products to determine whether they are t for a particular purpose and are suitable for the user’s
substrates, method of application and desired end use.
Rounding the corners, slightly recessing the product into the substrate, or providing raised edges around the Reclosable fastener can reduce the possibility of edge
lifting and improve the overall appearance of the fastener on the nished product. Mechanically securing the corners of the fastener with rivets, staples, screws, etc.
may also reduce the possibility of edge lifting, but may reduce the closure performance.
The two most common techniques for attaching these 3M hook and loop fasteners to various surfaces are summarized below.
Pressure Sensitive Adhesive Attachment: The use of pressure sensitive adhesives eliminates or reduces the need for sewing, solvent activation, dielectric or ultrasonic
bonding or bulk adhesive bonding. This can result in simplicity, improved safety and lower installation costs. Pressure sensitive adhesive products can be applied
manually or automatically using a variety of equipment choices. Contact your 3M Sales Representative to discuss automated equipment options.
Surface Preparation: Highly textured surfaces may reduce the ultimate adhesion levels and care should be given to minimize the surface texture or roughness.
Adhesive backed fasteners should be applied to surfaces that are clean, dry and free of oil, grease, dust, mold release agents or surface contaminants that could
reduce the adhesion. It is recommended to remove any surface contaminants that may reduce adhesion by using a method suited for the type and quantity of surface
contaminants present. Isopropal alcohol is a good general use solvent for cleaning contaminants from surfaces for example.
In exceptional cases, especially when removing silicone mold release agents or on rough, porous surfaces, it may be necessary to lightly abrade the surface, use an
adhesion promoter, or surface sealer to optimize the adhesive bond to the substrate. The selection of abrasion, priming or sealing methods will depend upon the
substrates and the environmental conditions the product will be exposed to during use.
Attachment Procedure: To obtain optimum bond to any surface, both the fasteners and the target surfaces should have equilibrated for a minimum of one hour at
temperatures between 68°F (20°C) to 100°F (38°C) before application. The liner protecting the adhesive is removed and preferably without touching the adhesive, the
fastener is applied to the substrate. Exposure of the adhesive to ambient conditions without the protective liner, before applying to the surface, should be minimized as
initial adhesive tack may decrease. Flexible materials should be lying on a hard at surface so as to permit uniform adhesive contact with the surface. Use of a rubber
hand roller, press platen or similar device is recommended to ensure full adhesive contact or wet- out with the substrate surface. Approximately 4.5 pounds of force
per square inch, (310 grams per square centimeter) is recommended to increase adhesive contact, improving bond strength. For all adhesive applications, it is
important to ensure that the edges are rolled down to reduce the chance of edge lifting.
Plain backed
The plain backed 3M hook and loop fasteners are most commonly sewn into their applications. Liquid or hot melt adhesives and staples are other forms of attachment
that can be utilized.
Sewing: Although the selvedge edge was initially developed for stitching on, customers often nd that they get better anchorage when stitching through the 3M hook
and loop portions of the fastener – this may be application dependant. The type of thread and stitch type is also best determined based on individual application,
however, the fastener should be stitched on all edges for the best seam strength. Typically, special machine adjustments
are not necessary when using our 3M hook and loop fasteners
Storage and Shelf Life
Shelf Life when stored in original packaging at 72°F (22°C) and 50% RH is 24 months.
