another plastic piece—called the rotor—is placed so that its teeth engage with those of the pinned piece. for example, a ring may be pinned to the paper and a small gear placed inside the ring. for example, a ring may be pinned to the paper and a small gear placed inside the ring.
superabsorbent polymer sap also called slush powder can absorb and retain extremely large amounts of a liquid relative to its own mass. water-absorbing polymers, which are classified as hydrogels when mixed, absorb aqueous solutions through hydrogen bonding with water molecules. a sap's ability to absorb water depends on the ionic concentration of the aqueous solution.
degradation during service life, or after careless disposal, is a chemical change that drastically reduces the average molecular weight of the polyvinyl chloride polymer. since the mechanical integrity of a plastic depends on its high average molecular weight, wear and tear inevitably weakens the material. weathering degradation of plastics .
a zipper, zip, fly, dingy, or zip fastener, formerly known as a clasp locker, is a commonly used device for binding the edges of an opening of fabric or other flexible material, such as on a garment or a bag. it is used in clothing e.g., jackets and jeans , luggage and other bags, sporting goods, camping gear e.g. tents and sleeping bags , and other items.
bioplastics are plastic materials produced from renewable biomass sources, such as vegetable fats and oils, corn starch, st, woodchips, sawdust, recycled food waste, etc. bioplastic can be made from agricultural by-products and also from used plastic bottles and other containers using microorganisms.
the corrosion resistance and low permeability of polymer concrete allows it to be used in swimming pools, sewer structure applications, drainage channels, electrolytic cells for base metal recovery, and other structures that contain liquids or corrosive chemicals. it is especially suited to the construction and rehabilitation of manholes due to .
the latter are advantageous because they are replaceable a new base can be inserted; thus damage to a base doesn't render the remainder of the barrier unusable . there are four main styles of replaceable bases: flat bases, bridge bases, u bases, and wheel bases, all of which offer advantages in different circumstances.
diamond plate can also be used decoratively, particularly highly polished aluminum variants. manufactured in plastic, diamond plate is marketed as an interlocking tile system to be installed on garage floors, trailers, and exercise rooms. diamond plate may be used for surface protection against damage from foot traffic or harmful chemicals .
unlike most thermoplastics, polycarbonate can undergo large plastic deformations without cracking or breaking. as a result, it can be processed and formed at room temperature using sheet metal techniques, such as bending on a brake. even for sharp angle bends with a tight radius, heating may not be necessary. this makes it valuable in .
permeable paving is a method of paving vehicle and pedestrian pathways to enable infiltration of stormwater runoff. permeable pavement surfaces typically include pervious concrete, porous asphalt, paving stones and interlocking pavers. unlike traditional impervious paving materials, permeable paving systems allow stormwater to percolate and infiltrate through the pavement and into the aggregate layers and/or soil below. in addition to reducing surface runoff, permeable paving systems can trap su
communications-based train control cbtc is a railway signaling system that makes use of the telecommunications between the train and track equipment for the traffic management and infrastructure control. by means of the cbtc systems, the exact position of a train is known more accurately than with the traditional signaling systems.
a bowden cable / ˈ b oʊ d ən / boh-dən is a type of flexible cable used to transmit mechanical force or energy by the movement of an inner cable relative to a hollow outer cable housing. the housing is generally of composite construction, consisting of an inner lining, a longitudinally incompressible layer such as a helical winding or a sheaf of steel wire, and a protective outer covering.
metal formwork systems are better protected against rot and fire than traditional timber formwork. re-usable plastic formwork. these interlocking and modular systems are used to build widely variable, but relatively simple, concrete structures. the panels are lightweight and very robust. they are especially suited for similar structure projects .
interlocking plastic clamps, where the large fin clip base is designed for overlocking and interlocking the jaw to the required tightness. t clamps are designed for high pressure pipes and hoses such as turbo pressure hoses and coolant hoses for high pressure engines. these clamps have a small grub screw that pulls the two halves of the clamp .
nonwoven fabric is a fabric-like material made from staple fibre short and long fibres continuous long , bonded together by chemical, mechanical, heat or solvent treatment.the term is used in the textile manufacturing industry to denote fabrics, such as felt, which are neither woven nor knitted. some non-woven materials lack sufficient strength unless densified or reinforced by a backing.
blister pack is a term for several types of pre-formed plastic packaging used for small consumer goods, foods, and for pharmaceuticals.. the primary component of a blister pack is a cavity or pocket made from a formable web, usually a thermoformed plastic. this usually has a backing of paperboard or a lidding seal of aluminum foil or plastic. a blister that folds onto itself is often called a .
they paved 1000 feet of street surface with interlocking blocks made of concrete which allow water to filtrate towards the ground through the spaces between the blocks. they then filled the gaps with fine sediment on top of a stronger base of rock. geotextile fabric was then placed below the more solid layer to reduce pollutant flow. this .
a pallet / ˈ p æ l ɪ t / also called a skid is a flat transport structure, which supports goods in a stable fashion while being lifted by a forklift, a pallet jack, a front loader, a jacking device, or an erect crane.a pallet is the structural foundation of a unit load which allows handling and storage efficiencies. citation needed goods or shipping containers are often placed on a .
layers in the construction of a mortarless pavement: a. subgrade b. subbase c. base course d. paver base e. pavers f. fine-grained sand in highway engineering , subbase is the layer of aggregate material laid on the subgrade , on which the base course layer is located.
polyethylene terephthalate can be depolymerized to yield the constituent monomers. after purification, the monomers can be used to prepare new polyethylene terephthalate. the ester bonds in polyethylene terephthalate may be cleaved by hydrolysis, or by transesterification. the reactions are simply the reverse of those used in production.
polypropylene pp , also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. it is produced via chain-growth polymerization from the monomer propylene.. polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar.its properties are similar to polyethylene, but it is slightly harder and more heat resistant.