摘要:
The pool cover is made of multi-layer light weight construction having a translucent top layer to permit sunlight to pass through an opaque bottom layer for absorbing sunlight passing through the transparent layer. In addition, a plurality of pockets are formed in the opaque layer having air encapsulated therein. When in use, the opaque layer becomes heated by sunlight thereby transferring heat by contact to the body of the water in the pool while also blocking light from the body of water to inhibit algae growth. The heated trapped air also serves to conduct heat to the body of water while also acting as a thermal insulation barrier during non-daylight hours. The pool cover may also be turned upside down in use. In other embodiment, all layers may be opaque.
摘要:
Sticks of foamable thermoplastic material are provided with grooves in at least one surface. These grooves extend width-wise of the stick. In addition, the grooves are disposed in equi-spaced relation along one surface of the stick, or in spaced-apart series or groups on only one surface, or in series or groups on opposite surfaces and in spaced-apart relation. Upon foaming, the sticks form formed elements of various shapes, each of which has at least one curvilinear portion such as, for example, a corkscrew shape, an annular shape or shapes with reverse bends.
摘要:
The loose fill packaging material of the illustrated embodiment comprises a plurality of free-flowing elements of, for example, expanded polystyrene. Each packaging element of the embodiment is of a block-like E-shaped form which includes three leg portions which define a pair of recesses between the legs. The width of the recesses is less than the width of the leg portions and, in use, the leg portions of one element do not fit within the recesses of another element. Instead, the packaging elements abut one another, rather than interlock, while forming a mass of resilient packaging material about an item packaged therewithin.
摘要:
The drainage element is made with a periphery formed of a filter material that allows the passage of water and prevents the passage of soil and a second peripheral section of net material that allows the passage of water while the preventing the passage of the lightweight aggregate therein. The filter material is preferably made of spun bonded polyester and may be made of a biodegradable material such as starch.
摘要:
A laminated construction having a first layer having a plurality of criss-crossing foamed filaments adhered to each other and defining a net, an impermeable layer laminated to the first layer along two opposite longitudinal edges to form a sleeve, and a perforated pipe extending within the sleeve. In another embodiment, a porous membrane surrounds the layer having a plurality of criss-crossing foamed filaments adhered to each other. In another embodiment, the laminated construction forms a pipe having a first layer having a plurality of criss-crossing foamed filaments adhered to each other and defining a net, an impermeable layer laminated to the first layer along two opposite longitudinal edges to form a sleeve, and a plurality of loose fill elements are within the sleeve for passage of fluid therethrough.
摘要:
A preassembled drainage line element is fabricated at least in part of a biodegradable material, such as kraft paper or a plastic film. The biodegradable material may be perforated to impart a characteristic of water permeability to the material.
摘要:
The machine employs a forming collar to shape a continuous web of material longitudinally about a barrel with the longitudinal edges splayed outwardly and over each other. A sewing machine spaced radially from the barrel secures the longitudinal edges together to form a sleeve having an outwardly directed flap. In another embodiment, the machine employs two forming collars to shape a pair of webs about the barrel with outwardly splayed edges on two sides and two sewing machines to secure the edges together to form a pair of flaps. The seam(s) can be sewn at one of a plurality of spacings from the barrel to form a drainage line element of a different diameter from a standard diameter without need to adjust or replace other components of the fabricating machine.
摘要:
The tubular element is made with a sleeve formed of a spun bonded polyester material that allows the passage of water and prevents the passage of soil when used for a drainage element. The tubular element is made with small diameters that allows the element to be coiled about a three-dimensional object when used as a cushioning device.