Parry/ITW Electric and Hand-Powered

Vibration Screeding Machines

Manufacturer
JPM Parry & Associates Ltd
Overend Road, Cradley Heath
West Midlands B64 7DD
United Kingdom
Tel. [ . . 44] 384 - 69171 (3 lines)
Tlx. 334132 it parr g
Fax. [ . . 44] 384 - 637753

Description

The Intermediate Technology Workshops (ITW), which is the research and consultancy division of JPM Parry & Associates, were the first to develop and manufacture vibration screeding machines for the production of fibre concrete rooftiles. They are thus the most experienced manufacturers of these machines, of which several types are available, catering for various production scales and energy inputs.

The ITW 250, ITW 500 and ITW 1000 are the three principal electric powered rooftile plants which are designed to produce 250 500 and 1000 rooftiles per week respectively based on a working week of 5 working days of 8 hours each with the minimum number of operators. All electric plants now use the Multivibe detachable vibrator (described in a separate leaflet in the GATE Product Information folder on Concrete Block Producing Equipment), which runs on 12 volt DC power from a car battery or transformer-rectifier connected to a mains power source. The advantage of the Multivibe is that it can also be used with altemative moulds and accessories to manufacture a number of other concrete building components.

Hand-powered versions of these machines, the HP 250, HP 500 and HP 1000, are available for remote areas where power supplies are unreliable or do not exist at all. The vibrator is set in motion by a second operator, who cranks a handle on the side of the machine, producing vibrations of identical amplitude and frequency to the electric machines. Kits are available to convert the HP machines to electric power should this subsequently become available.

The standard rooftiles produced on these machines are pantiles and Roman 11 tiles, 50 cm long, 25 cm wide and 6, 8 or 10 mm thick. To cover one square metre of roof 13 tiles are needed. As an alternative, Parry Associates also offer larger machines and moulds to produce semi-sheets 60 cm long and wide, requiring only 4 elements to cover one square metre. The semi-sheet production plants are available as NS 150, 250, 400, 600 and 800, depending on the desired output rates. Operation and handling of the semi-sheet equipment are principally the same as for the standard rooftiles.

The injection moulded polypropylene moulds are self-stacking, ie they interlock when placed on top of each other, saving space and providing air-tight, humid chambers for the wet tiles to set during the first 24 hours after moulding.

The standard accessory packs comprise sand and cement batching boxes, mortar measuring scoop, fibre balance, demoulding and quality control jig, sample sieve, sample tile, sample dry mortar mix, 2 trowels and a spare parts kit. Various optional extras are available, including hand power conversion kits, battery chargers, and tile testing devices.

Operating the Parry Screeding Machines

An interface sheet is placed on the screeding surface and clamped down with the screeding frame. A level scoop of motar is measured and spread out on the screeding surface with a float. (In the case of semi-sheets, 4 scoops of mortar are needed). With the vibrator switched on, the mortar is smoothed out such that the surface is level with the frame. Finally the nib-forming box is filled under vibration and - if necessary - a wire loop is inserted.

The mould is then placed on the brackets, the frame released carefully, making sure not to damage the nib, and the interface sheet with the screeded mortar pulled onto the mould, taking care that the edges of the tile are exactly in line with the guide markings on the mould. The mould is set aside on the curing stack.

On the next day the mould and green tile are placed upside down on the demoulding jig, so that the mould can be lifted off and the polythene interface sheet peeled off. Any rough edges of the tile are trimmed off and the tile is left to cure for 2-3 weeks, fully immersed in a water tank, or in a humid container, where it gains its full strength.

Training Courses

On request, special training courses are offered at the Intermediate Technology Workshops, Cradley Heath, U.K. and at several other overseas locations. The courses are not only on the technology of fibre concrete rooftile and semi-sheet production, but can also include other production technologies with Parry equipment, such as those of a large variety of concrete building components, as well as clay bricks and rooftiles.

Course durations are typically 5 or 10 days costing a fee of 250 or 500 £ Sterling respectively.

Technical Details	MV 250	ITW/MV 500	ITW/MV 1000
Size of machine/workstation (I x w x h)	38 x 65 x 19 cm	65 x 61 x 92 cm	65 x 67 x 92 cm
Weight of machine/workstation	32kg	61 kg	61 kg
Size of crate for shipping	91 x64x 84 cm	110x65 x 84cm	132x96x 114cm
Weight of packed plant	170 kg	260 kg	470 kg
Standard tile size (Roman or pantile) 50 x 25 x 0.6/0.8/1 cm	50 x 25 x 0.6/0.8/1 cm	50 x 25 x 0.610.8/1 cm
Number of moulds: rooftiles / ridge tiles	48 /2	96 /4	192/ 8
Energy input / transmission electric / mechanical	electric / mechanical	electric / mechanical
Output: No of tiles per cycle / per day	1 / 50	1 / 100	1 / 200
Labour force required	1 man	2 men	3 men
Price (FOB) with Multivibe 1320 £ Sterling (~ 2310 US$)	1990 £ Sterling (~ 3480 US$)	3070 £ Sterling (~ 5370 US$)
valid June 1991 detachable vibrator
Technical Details	HP 250	HP 500	HP 1000
Size of machine/workstation (I x w x h)	65 x 67 x 92 cm	65 x 67 x 92 cm	65 x 67 x 92 cm
Weight of machine/workstation	61 kg	61 kg	61 kg
Size of crate for shipping	91 x 64 x 84 cm	110 x 65 x 84 cm	132 x 96 x 114 cm
Weight of packed plant	245 kg	260 kg	470 kg
Standard tile size (Roman or pantile) 50 x 25 x 0.6/0.8/1 cm	50 x 25 x 0.6/0.8/1 cm	50 x 25 x 0.6/0.8/1 cm
Number of moulds: rooftiles / ridge tiles	48 1 2	96 /4	192 / 8
Energy input / transmission N manual / mechanical	manual / mechanical	manual / mechanical
Output: No of tiles per cycle / per day	1 / 501	1 / 100	1 /200
Labour force required	2 men	3 men	4 men
Price(FOB) with hand 1615 £ Sterling (~2830US$)	2095 £ Sterling (~3670US$)	3180 £ Sterling (~5570US$)
valid June 1991 powered vibrator
Technical Details	NS 150	NS 40	NS 800
Size (I x w x h) / number of machines	96 x 93 x 94 cm / 1	96 x 93 x 94 cm / 1	96 X 93 X 94 cm /2
Weight of machine/workstation	105 kg	105 kg	105 kg
Size of crate for shipping	96x 157x 115cm	96x 157x 115cm	2boxes,of 96x 157x 115cm
Weight of packed plant	400 kg	620 kg	1240 kg
Standard semi-sheet size	60 x 60 x 0.8 cm	60 x 60 x 0.8 cm	60 x 60 x 0.8 cm
Number of moulds: semi-sheets / double ridge tiles 30/3	80/8	160/16
Energy input / transmission	electric / mechanical electric / mechanical	electric / mechanical
Output: No of semi-sheets per cycle / per day 1 /50	1 / 100	1 / 200
Labour force required	1 man	2 men	3 men
Price (FOB)	with Multivibe 2250 £ Sterling (~ 3940 US$)	3550 £ Sterling (~ 6220 US$)	7070 £ Sterling (~ 12400 US$)
valid June 1991 detachable vibrator