The invention relates to a method for preparing elastic and glossy dacron drawing yarns with potential crimps A glossy polyester melt is used as a raw material The method comprises the steps of 1, conveying the raw material to a spinning box, and forming melt-shaped fibers after measurement and the filtration of a spinning assembly; 2, after solidifying the melt to as-spun fibers, dividing the fibers into two groups, cooling one group of fibers by a side blowing device, arranging one group of heating devices in front of an air inlet of the side blowing device, arranging one group of steam pipelines in the heating devices, controlling an air temperature between 32 DEG C and 40 DEG C, controlling a side blowing speed at 05-08 m/s, and conveying the other group of fibers to an air-free device, wherein the length of an air-free zone of a spinneret plate is 150 mm, and the air pressure of a side blower is set to 480-600 pa; and 3, after applying oil with an oil nozzle, respectively combining two groups of filaments with crystallization difference by a pre-interlacer in a one-to-one way, then increasing interlacing points by a first hot godet, a second hot godet and a main interlacer, and finally winding and molding by a winder head

Method for preparing elastic and glossy dacron drawing yarns with potential crimps

The invention discloses heat-resisting insulation concrete, which is prepared from the following raw materials in parts by weight: 60-80 parts of silica powder, 100-120 parts of closed cell perlite, 4-6 parts of polyvinyl alcohol, 16-20 parts of rice hull powder, 7-10 parts of monoammonium phosphate, 5-8 parts of super-light clay, 20-30 parts of kuancheng (Chinese character) clay, 150-170 parts of cement, 100-120 parts of iron ore wall rock, 30-40 parts of mineral powder, 400-430 parts of macadam, 260-280 parts of yellow sand, a proper amount of water and 20-30 parts of assistant The concrete disclosed by the invention is good in compactibility and high in strength; the closed cell perlite is utilized, the heat-resisting insulation concrete has heat preservation resistance, and the heat resistance is 700 DEG C The compressive strength, the rupture strength and the tensile strength of the concrete are increased by using the assistant, and the corrosion resistance, the anti-corrosion performance and the water seepage are increased

Heat-resisting insulation concrete and preparation method thereof

The invention discloses anti-radiation concrete, which comprises, by weight, 280-320 parts of cement, 90-110 parts of mineral powder, 55-65 parts of fly ash, 970-1000 parts of heavy crystal sand, 1150-1200 parts of barite, 200-300 parts of an anti-radiation enhancer, 170-190 parts of water, 10-11 parts of an admixture, 6-8 parts of a chelating agent, and 8-10 parts of a retarder. According to thepresent invention, the anti-radiation concrete has the improved radiation resistance and the increased final solidification time, and further can achieve the double technical effects of retardation setting and radiation resistance.

Anti-radiation concrete

Provided is a protective concrete for weaken the intensity of proton radiation, and it is prepared by mixing 525# cement 500-700 Kg; barite sand 1000-1400 kg, barite stone 1500-1800 Kg, lead powder 180-200 Kg and water 170-180 Kg. The barite that can absorb the proton radiation is used, so the present concrete is much better than conventional concretes in weakening the proton radiation, and 1.5 m-thick wall without lead plates which is prepared with the present concrete can achieve the same effect on weakening the proton radiation with a conventional 2 m-thick wall covering with lead plates.

Protective concrete for weakening the intensity of proton radiation

A process for manufacturing crimped filaments of terylene and the apparatus thereof, the process comprises: a?divide the filaments spun from the spinning nozzle into two groups, and one of which is subjected to a hot wind blown from an air heater provided beside the path of the filaments; b?the two groups of the filaments are mixed together and wound on a bobbin; c?forming a fabric from the mixed filaments in a weaving machine and steeping the fabric in a water bath of 60-128?. The present process is reasonable and the apparatus is simple, the produced terylene filaments and the woven fabric will have natural crimps.

A process for manufacturing crimped filaments of terylene and the apparatus thereof

A constant temperature and humidity air conditioning apparatus for a room with proton equipment includes three constant temperature and humidity machines (1,2,3), air outlet pipes (4,5,6), and air outlets (7,8,9) Three constant temperature and humidity machines (1,2,3) operate at same time in the room with proton equipment, they are connected with the outlet pipes (4,5,6) respectively, three air outlets (7,8,9) are disposed respectively on the upper parts of the air outlet pipes and at different distances from the ground

Yan Lv

Papers

Protective concrete for weakening the intensity of proton radiation

A process for manufacturing crimped filaments of terylene and the apparatus thereof

Constant temperature and humidity air conditioning apparatus for a room with proton equipment