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3M ? Reclosable Fastener SJ3000
Thin Hook and Loop Back to Back
Attachment Techniques
The following information is intended to assist the designer considering the use of
3M? Reclosable Fastener SJ3000. It is recommended that the user evaluate 3M
products to determine whether they are fit for a particular purpose and suitable for
the user ’s materials, method of application and desired end use.
Reclosable fastener SJ3000 can easily be cut to desired dimensions and shapes per
application need. The product is often used in rectangular strips 1/2" width by
appropriate length required to wrap at least one and one half times around item(s)
being bundled plus a 0.5 inch (1.3 cm) tab or flag. A common formula for
determining desired length is:
(Bundle or item circumference in inches ) x (1.5) + 0.5 inch
(Bundle or item circumference in centimeters) x (1.5) + 1.3 cm
While reclosable fastener SJ3000 is more flexible than many common bundling
materials, care should be exercised in wrapping bundles that have very small
diameters, lest flagging of the end will occur, possibly leading to premature
disengagement. To prevent premature or undesirable flagging a small quantity of a
curable liquid adhesive, hot melt, epoxy or similar material could be applied
joining the exposed end of the fastener with the underlying fastener. This method
will make it more difficult to easily disengage the fasteners.
Rounding the corners can reduce the possibility of edge lifting or flagging while
improving the overall appearance of the fastener on the finished product.
Mechanically securing the corners of the fastener with rivets, staples, screws, etc.
may reduce the closure performance.
Material Surface Preparation: Textured or rough surfaces, especially those that
may engage with a hook or loop can allow easier starting of a wrap around an
object(s). Very smooth surfaces may cause slippage or difficulty in starting the
wrap. In that case the surface could be roughened, or small strips of 3M?
Reclosable Fasteners SJ3506 or SJ3507 could be first applied to the surface.
Surfaces containing oils, mold release agents or other coatings and materials that
can create a slippery surface should be avoided due to possible difficulty in getting
the wrap started, or slipping in usage. It is recommended to remove any surface
contaminants that may cause slippage or problems with starting the wrap by using a
method suited for the type and quantity of surface slip agent present.
Engagement Procedure: Highly porous, soft or fragile materials such as some
vegetables or foam materials may crush or collapse if too high of a pressure is
applied during bundle wrapping. Approximately 2 pounds per inch width (0.4
kilograms per centimeter width) is required for engaging reclosable fastener
SJ3000 to itself. For all applications, it is important to ensure that an acceptable
amount of overlap at the end of the fastener is provided to prevent premature
unwrapping or flagging.
The most common technique for attaching reclosable fastener SJ3000 is to wrap
the product upon itself, forming the closure system to bundle items together,
provide surface protection or to secure items during transport. To ensure full
fastener strength the fastener should be completely overlapped, not spiral would
unless the reduced engaged surface area is taken into account.
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