Heat Transfer

(Thermodynamics) The movement of heat from a hot to a cold body until equilibrium is achieved. (gas, liquid, solid, or combinations) by means of radiation, convection, or conduction. A heat exchanger allows heat to be transferred, as in a fridge. (wik)

Heat Transfer printing

Dyes on paper are transferred to fabric by heat.

HTC Heat Treated Carpet

100% recycled board made from recycled nylon carpet. www.carpetburns.com.

Heavy metals

Used as mordents to enable dyestuff to bond with fibres in many natural dye recipes. Many are poisonous. Use is not desirable, but absence can render limits to actual achievable shades of colour, as well as impermanence to light and washing. (AS)

Heavy metals in Periodic table: As, Pb, Cd, Cr, Co, Cu, Ni, Hg

Hemp

A bast fibre is derived from this plant. A miracle plant which thrives on marginal land with few nutrients and which replenishes the nutrients in that soil. It grows easily and has a nickname ‘weed’. It grows quickly and can help rebind soils which are being comprmised by erosion, for example as a result of felling trees and forests. It can be made into biodiesel, soap, cooking oil, and has nutritious seeds.

It makes very strong fibre and used to be used in C17th for sails before the being replaced by linen.

Herbicides


Many herbicides act on animal tissue as well. Weed killers are often derived from arsenic. the effects on wash off to aqautic life are undesirable. Carson cited the following 2 chemicals whcih do not seem to be ebing used any more: Dinitrophenol (is a federal hazardous air pollutant and was identified as a toxic air contaminant in April 1993- wik 22.5.07) Carson also cited Pentachlorophenol now only used in wood treatment plants, but aminotriazole is still used but not currently on food stuffs because of its carcenegenic properties wikipedia 22.5.07) , and amitrol, which is still used. (carson R silent spring, pub penguin 1972)

Hessian


A type of fabric make from Jute, which is plant producing a bast fibre. Used to be the inexpensive fabric from which sacks were made. Loosely woven, strong and rough. Used for the hidden parts of upholstery, as backing for rugs, and carpets,
and as the base fabric for thrift crafts such as hooking and progging rag rugs.

Hooking

Traditional thrift craft of rag rug making. Strips and scarps of fabric are ‘hooked’ through a loosely woven backing such as hessian, or old sacks, and loops form the pile (which can also be cut, which makes the rug into a ‘clippy’ rug)

Hollow Core fibres

Fibres with a hollow centre which make them thermally efficient because the hollow traps air.

Hydrophillic

Attracts water (technotextiles).

Hydrophobic

Repels water (technotextiles)

www.pilmembranes.com