Hook and Loop FAQ | VELCRO® Brand FAQ | Frequently Asked Questions
A plastic molded hook for use with a hook and loop fastening system of the hook penetrating into a pile of loops is defined as the displacement volume. Hooks 1 is a cross section of a hook of a conventional textile hoop and loop closure system. 12 is a graph depicting the relationship between shear strength and hook. A plastic molded hook for use with a hook and loop fastening system the hook penetrating into a pile of loops is defined as the displacement volume. , Burr-type closure or coupling element, , Morin, 24/ . 12 is a graph depicting the relationship between shear strength and hook. Hook-and-loop fasteners, hook-and-pile fasteners or touch fasteners consist of two Loops. A shoe using hook-and-loop closures. Macro photograph of hooks. Hook-and-loop fasteners, hook-and-pile fasteners or touch fasteners (often.
Firstly, instead of a single-file line of hooks, touch fasteners have a two-dimensional surface.
The other difference is that hook-and-loop has indeterminate match-up between the hooks and eyes. With larger hook-and-eye fasteners, each hook has its own eye.
On a scale as small as that of hook-and-loop fasteners, matching up each of these hooks with the corresponding eye is impractical, thus leading to the indeterminate matching. Various constructions and strengths are available. The strength of the bond depends on how well the hooks are embedded in the loops, how much surface area is in contact with the hooks, and the nature of the force pulling it apart.
If hook-and-loop is used to bond two rigid surfaces, such as auto body panels and frame, the bond is particularly strong because any force pulling the pieces apart is spread evenly across all hooks.3M Dual Lock Fastener - VELCRO SUCKS THIS IS BETTER
Also, any force pushing the pieces together is disproportionately applied to engaging more hooks and loops. Vibration can cause rigid pieces to improve their bond.
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Full-body hook-and-loop suits have been made that can hold a person to a suitably covered wall. When one or both of the pieces is flexible, e. If a flexible piece is pulled in a direction parallel to the plane of the surface, then the force is spread evenly, as it is with rigid pieces.
Three ways to maximize the strength of a bond between the two flexible pieces are: Increase the area of the bond, e. Ensure that the force is applied parallel to the plane of the fastener surface, such as bending around a corner or pulley. Increase the number of hooks and loops per area unit. Shoe closures can resist a large force with only a small amount of hook-and-loop fasteners.
This is because the strap is wrapped through a slot, halving the force on the bond by acting as a pulley system thus gaining a mechanical advantageand further absorbing some of the force in friction around the tight bend.
This layout also ensures that the force is parallel to the strips. Advantages and disadvantages[ edit ] RFID transponder attached to car with touch fastener Touch fasteners are easy to use, safe, and maintenance free.
There is only a minimal decline in effectiveness even after many fastenings and unfastenings. The tearing noise it makes can also be useful against pickpockets.
There are also some deficiencies: The loops can become elongated or broken after extended use. The hooks often become attached to articles of clothing, especially loosely woven items like sweaters.
This clothing may be damaged when one attempts to remove the hook-and-loop, even if the sides are separated slowly. The tearing noise made by unfastening hook-and-loop fasteners make it inappropriate for some applications.
For example, a soldier in hiding would not want to alert the enemy to his position by opening a pocket. Textiles can contain chemicals or compounds, such as dyes,  that may be allergenic to sensitive people.
Some products have been tested according to the Oeko-tex certification standard, which imposes limits on the chemical content of textiles to address the issue of human ecological safety.
- Clothing Fasteners
- Understanding the basis of space closure in Orthodontics for a more efficient orthodontic treatment
- Hook-and-loop fastener
It is especially popular in clothing where it replaces buttons or zippers, and as a shoe fastener for children who have not yet learned to tie shoelaces. Touch fasteners are used in adaptive clothingwhich is designed for people with physical disabilities, the elderly, and the infirm, who may experience difficulty dressing themselves due to an inability to manipulate closures such as buttons and zippers. Touch fasteners held together a human heart during the first artificial heart surgeryand it is used in nuclear power plants and army tanks to hold flashlights to walls.
Cars use it to bond headliners, floor mats and speaker covers. It is used in the home when pleating draperies, holding carpets in place and attaching upholstery. Current knowledge in biomechanics, allied with the development of new material and techniques, made significant upgrading possible in space closure, which has simplified mechanics.
In order to achieve good treatment outcomes, it is crucial to understand the principles behind space closure. Certain aspects must be considered, and precise control of tooth movement during space closure in three dimensions is of preponderant importance to achieve treatment goals. In general, six goals should be considered for space closure: Two basic biomechanical strategies can be used to close spaces: This article will discuss various theoretical aspects of space closure as well as some methods to close space sites, based on biomechanical concepts.
In Orthodontics, it can be defined as the ability to prevent tooth or teeth movement while moving another tooth or group of teeth.
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In modern Orthodontics, the success of orthodontic treatment generally relies on the anchorage protocol planned for each specific case. Anchorage should be established at the beginning of treatment and its preparation is a very important part of orthodontic treatment. In general, these two units play different roles during space closure. The active unit is normally affected by the majority of movements, while the other unit resists to movement anchorage.
It is convenient to classify an extraction arch by the differential space closure required between anterior and posterior teeth.