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The platen then drops and the hot knife is removed. After the hot knife is completely clear of the straps the platen comes back up and compresses the joint so that the melted portions of the strap mix and harden. For thicker plastic strap, usually 0.73 mm (0.029 in) and thicker, friction is used to create heat within the joint.
Types of strapping include steel, polyester, polypropylene, nylon, paper, and composites. The type of strap used depends on the requirements, for example, strength, elasticity, ability to withstand various environments, ease of use, safety, and cost. Strapping methods and limits should be according to valid standard, for example EN12195.
Light-duty tools are operated by squeezing the handle with the fingers, while heavy-duty versions can be powered by compressed air or a solenoid, to prevent repetitive strain injury. In order to increase resistance to ultraviolet light in outdoor applications, nylon containing a minimum of 2% carbon black is used to protect the polymer chains ...
Heavy duty coiled spring pins are typically used in high shear strength applications and hardened host materials. Light duty pins are used in applications with soft metals and plastics holes where there is a high risk of enlarging or breaking the host using a traditional press fit solid pin.
HDPE is known for its high strength-to-density ratio. [4] The density of HDPE ranges from 930 to 970 kg/m 3. [5] Although the density of HDPE is only marginally higher than that of low-density polyethylene, HDPE has little branching, giving it stronger intermolecular forces and tensile strength (38 MPa versus 21 MPa) than LDPE. [6]
Sweeping deportations pledged by President-elect Donald Trump could pose an economic shock for the restaurant industry in ways that echo the pandemic: pricier menus, rising wages, and shuttered ...
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