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] 1384-569171 or 564991
Fax. [..44] 1384-637753

Description

The Intermediate Technology Workshops (ITW) is the research and consultancy function of JPM Parry and Associates and were the first to develop and manufacture vibration screeding machines for the production of fibre concrete roof tiles. They are thus the most experienced manufactures of these machines, of which several types are available catering for various production scales and energy inputs, and producing several different types of roofing element.

The following types of electric powered machines are available:

· MV Table Top Unit

This consists of the essential Multivibe vibrator, screeding plate, screeding frames and mould holding arms only.

· MV Workstation

Consisting of the Table Top Unit but fitted in a steel Workstation giving the correct working height and a storage shelves for interface sheets etc.

· MV Workstation & Hopper

As above but with the addition of a raised container to hold mortar within easy reach of the operator.

The above machines are all capable of the same output, but in the case of the more basic model the operator must provide his own table (workstation) on which to place the Table Top Unit and also a mortar container (hopper) from local sources. Production capacity depends upon the number of moulds used with the machine and also the number of workers employed. In practice a single machine will usually be able to fill a maximum of 600 moulds in an 8 hour working day. Typical production plants are as follows:

· Parry MV Tile machine, 2 workers, 200 moulds plus accessories

- output 200 tiles per day.

· Parry MV Tile machine, 3 workers, 400 moulds plus accessories

- output 400 tiles per day.

· Parry MV Tile machine, 5 workers, 600 moulds plus accessories

- output 600 tiles per day.

In order to achieve the above outputs it will usually be necessary to use a concrete mixing machine, also available from Parry Associates, Alternatively mixing can be done by hand, but this may require an additional worker.

On request, Parry can also supply a Fast Moulding system whereby one machine can produce 800 to 900 tiles per day.

All the parry electric plants 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 be used with alternative moulds and accessories to manufacture a number of other concrete building components.

The smallest Parry tile machine is the Table Top Unit, a standard screeding machine which can be transported by one person. When in use the machine is usually bolted to a workbench or into a workstation. As with all tile machines, output depends upon the number of workers and the organisation of the factory. The typical range is from two workers filling 200 moulds per day up to 5 workers filling 600 moulds per day.

The Parry Workstation machine uses the standard screeding machine fitted into a frame set at the most convenient height for working. The workstation has tool tray and shelves for holding interface sheets etc. The hand powered machines are always supplied in workstation format. Rubber mounted mould brackets and screed transfer flaps are fitted to all Parry machines, making it easier to slide the wet tile onto the mould.

The Workstation plus Hopper machine includes a second raised framework with a container to hold a quantity of mortar within easy reach of the machine, plus extra shelves.

Hand Powered Parry Tile Machine - This is supplied in a workstation to which parts of the mechanism are attached. The main advantage of hand-powered screeding machines is that they are completely independent of all power sources, but completely replicate the functions of the electric machines. Although slightly more working space is required, the output of the hand powered machines is the same as that of the electric, and in plants producing significant quantities of tiles the labour requirements is not increased. Cranking the handle once per second (60 rpm) generates a vibration at 3000rpm. By using hand powered rather than pedals, the second worker is free to move about the workplace handling moulds, interfaces, mortar etc.

The Workstation and Workstation plus Hopper versions of the above machines are also available in Hand Powered form, suitable for remote areas where power supplies are unreliable or do not exist at all. The vibrator is set in motion by a second worker who cranks the handle on the side of the machine, producing vibrations of identical amplitude and frequency to the electric machines. It has been found that the work of powering the machine can usually be carried out by an operator who is also carrying out tasks such as taking away the filled moulds and handling interface sheets etc., it is therefore not usually necessary for additional workers to be employed, compared to where an electric plant is being used.

A duel power Electric and Hand Powered machine is available on request.

The standard roof tiles produced on these machines are Pantiles and Roman II tiles, 50cm long, 25cm wide and 6, 8 or 10mm thick. To cover one square metre of roof 12.5 tiles are needed. As an alternative, Parry Associates also offer equipment and moulds to produce larger tiles. The latest development is a Super Roman tile which has a coverage of 8 tiles per square metre. Super Roman plants are available in the same specifications as the Pantile and Roman II machines. Maximum outputs are slightly lower, eg. 2 workers with 1 Super Roman machine could fill around 150 moulds per day.

Parry Associates also offer a much larger machine and moulds to produce Semi Sheets, 60cm long and side, requiring only 4 per square metre of roof coverage. In practice a single Semi Sheet machine will be capable of filling a maximum of 250 moulds in an 8 hour working day. Typical production plants are as follows:

· Parry Semi Sheet machine, 2 workers, 80 moulds plus accessories

- output 80 Semi Sheets per day.

· Parry Semi Sheets machine, 3-4 workers, 200 moulds plus accessories

- output 200 Semi Sheets per day.

· Parry Semi Sheet machine, 4-5 workers, 250 moulds plus accessories

- output 250 Semi Sheets per day.

Operation and handling of the Semi Sheet equipment are principally the same as for the standard roofing tiles.

The moulds are injection moulded polypropylene or vacuum formed polyethylene and are self-stacking, ie the interlock when placed on top of each over, saving space and providing air tight humid chambers for the wet tiles to set during the first 24 hours after moulding. Wooden frames need to be attached to the moulds and these are usually supplied in standard plants by Parry Associates, but may be sourced locally. Additionally, interface sheets are provided with full plants but again these may be sourced locally.

Full accessory packs can be supplied with machines and moulds which include comprehensive instruction manual, batching boxes, mortar measuring scoop, fibre balance, demoulding and quality control gauge, sample sieve, sample tile, sample dry mortar mix, 2 trowels and spare parts kit. Alternatively Parry Associates supply a minimum accessory package to suit users requirements.

Additional items such as mains electricity transformers, concrete mixers, tile testing and quality control equipment, special tile kits (Valleys, Hips, Top Row, Edge, etc.), plus various other items such as handling equipment, mobile curing bins etc. are also available.

Semi-sheet screeding table: spreading mortar.

Placing wet Semi-sheet on the setting mould.

Semi-sheet moulds stacked to set overnight.

Operating the Parry Screeding Machines

An interface sheet is placed on the screeding plate and clamped down with the screeding frame. An appropriate level scoop or scoops of mortar is measured and spread out on the screeding surface with a trowel. With the Multivibe vibrator switched on, the mortar is smoothed out such that the surface is level with the screeding frame. Finally the nib-forming box is filled under vibration and, if desired, a wire loop is inserted.

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

Technical Details - MV Tile Plants		1000 tiles/week	2000 tiles/week	3000 tiles/week
Size of machine (l x w x h)		38 x 65 x 19 cm	38 x 65 x 19 cm	38 x 65 x 19 cm
Weight of machine		32 kgs	32 kgs	32 kgs
Size of crate for shipping		1 box total 0.80 m3	1 box total 1.44 m3	2 boxes total 2.24 m3
Weight of packed plant		210 kgs	360 kgs	525 kgs
Standard tile size (Roman II 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: roof tiles		200	400	600
energy input/transmission		electric/mechanical	electric/mechanical	electric/mechanical
Output: No of tiles per cycle/per day		1/200	1/400	1/600
Labour force required		2 men	3 men	5 men
Price Ex-Works Valid Dec 1996	with Multivibe detachable vibrator	2093 £ Sterling	3533 £ Sterling	4973 £ Sterling

Technical Details - HP Plant		1000 tiles/week	2000 tiles/week	3000 tiles/week
Size of machine (l 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 kgs	61 kgs	61 kgs
Size of crate for shipping		1 box total 1.00 m3	1 box total 1.74 m3	2 boxes total 2.54 m3
Weight of packed plant		240 kgs	400 kgs	570 kgs
Standard tile size (Roman II 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: roof tiles		200	400	600
Energy input/transmission		manual/mechanical	manual/mechanical	manual/mechanical
Output: No of tiles per cycle/per day		1/200	1/400	1/600
Labour force required		2 men	3 men	5 men
Price Ex-Works Valid Dec 1996	with hand powered vibrator	2369 £ Sterling	3809 £ Sterling	5249 £ Sterling

Technical Details - Semi Sheet Plants		400 sheets/week	1000 sheets/week	1250 sheets/week
Size of machine (l x w x h)		96 x 93 x 94 cm	96 x 93 x 94 cm	96 x 93 x 94 cm
Weight of machine		100 kgs	100 kgs	100 kgs
Size of crate for shipping		1 box total 1.74 m3	2 boxes total 3.18 m3	2 boxes total 3.48 m3
Weight of packed plant		320 kgs	570 kgs	670 kgs
Standard tile size (Semi Sheet)		60 x 60 x 0.8 cm	60 x 60 x 0.8 cm	60 x 60 x 0.8 cm
Rubber moulds: roof tiles		80	200	250
Energy input/transmission		electric/mechanical	electric/mechanical	electric/mechanical
Output: No of tiles per cycle/per day		Jan-80	1/200	1/250
Labour force required		2 men	3 to 4 men	4 to 5 men
Price Ex-Works Valid Dec 1996	with Multivibe detachable vibrator	2809 £ Sterling	5299 £ Sterling	6337 £ Sterling

The next day the mould and green tile are placed upside down on the demoulding gauge so that the mould can be lifted off and the plastic interface sheet peeled off. Any rough edges of the tile are trimmed off and the tile is then placed in a curing chamber. (More experienced producers often demould without the use of the gauge and use this only to quality control the shape of sample tiles from each batch made.) Two methods of curing can be used. The most basic being to simply place the products in a water filled tank for up to two weeks. More rapid curing (3 to 4 days in hot climates) is possible by using a humid chamber. Fixed high humidity curing chambers can be constructed on site (instructions provided by Parry), or the Parry system of mobile high humidity curing bins can be used.

Koma Rock, Nairobi/Kenya: The largest single housing scheme with fibre concrete roof tiles made with Parry/ITW equipment.

On request, special training courses are offered at the Intermediate Technology Workshops Cradley Heath, UK and by their local representatives in other countries. The courses not only cover the technology of lightweight concrete roofing elements and building construction, but can also include other production technologies with Parry Equipment. These include various other concrete building components plus clay bricks and roof tiles and compressed earth blocks.

Course duration can vary to suit the time available to the trainee, but are usually between 3 and 10 days. Costs are around £300 to £600, but purchasers of equipment will usually be trained free of charge at the UK workshops.

ADDRESS LIST OF OVERSEAS AGENTS, REPRESENTATIVES, DISTRIBUTORS

Angola

Cemtec LDA
Rua Conego
Manuel das Neves
No. 106, CX postal 1402
Luanda

Tel/Fax: +244 2 349035

Bangladesh

Castle Construction Co. Ltd.
PO Box 2680
House No. 50, Road 2A
Dhanmondi Road R/A
Dhaka 1209

Tel: +880 2 507497 / 502404
Fax: +880 2 863044

Belize

Gush & Emy Ltd.
5 Mapp Street
PO Box 1237
Belize City

Tel: +501 2 45953
Fax: +501 2 31042

Cameroon

Revetement Jacal
PO Box 7331
Douala
Bassa

Tel: +2237 409413
Fax: +2237 428423

Ghana

Parakuo Estates Ltd.
Plot 7, block 5
Dadeban Street, Ring Road
PO Box 3727
Accra

Tel: +233 21 223245 / 226757
Fax: +233 21 2292
e-mail: mattouk@africaonline.com.gh

Kenya (East African Representatives)

ITW (KENYA) Ltd.
4^th Ngong Avenue
PO Box 45156
Nairobi

Tel: +254 2 720962/3
Fax: +254 2 727657
e-mail: nevans@form-net.com

Kenya (Agents and Distributors)

Kate Freight & Travel Ltd.
Ufanisi House
PO Box 28330
Nairobi

Tel: +254 2 543716
Fax: +254 2 544446
e-mail: kate@form-net.com

Madagaskar

Famokarand Tao Trano
BP 3508
Antananarivo 101

Tel: +261 2 295 10
Fax: +261 2 242 48

Nigeria

Niger Equipment Ltd.
Jagal House
Jagal Road
Oregun, PO Box 3959
Ikeja, Lagos

Tel: +234 1 900010-19
Fax: +234 1 964409

Senegal

Fibre-Mac
Domaine Industriel
BP 5872, Dakar

Tel: +221 257384

Sudan

Maria Enterprises Ltd.
PO Box 2519
Street 47
Khartoum 2

Tel: +249 11 45392

Surinam

Hesdy Landburg
Sureineve Kanehai Weg 53
PO Box 5147
Paramaribo

Tel: +597 65643
Fax: +597 10555

Sri Lanka

HDL
Construction & Property Trades (PVT) Ltd.
No. 78, Cannal Road
Hendala, Wattala

Tel: +94 930650
Fax: +94 930817

Thailand

CVBT
Km 147 Udonthani-Nongkhai Road
Group 5, Ban Thin
Tambon Ban That
Phen District
Udonthani 41150

Tel: +66 1 2130801
Fax: +66 42 241712

Uganda

Magric (U) Ltd.
Kitgum House
PO Box 3218
Kampala

Tel: +256 41 232100
Fax: +256 41 244606

Zambia

Lutanda Ltd.
PO Box 20516
Moseshi Road
Kitwe

Tel: +260 2 218166

or

Compresstair Ltd.
PO Box 33139
Washama Road
Lusaka

Tel: +260 1 216110