Tyre Retreading Brushes | Industry of Tyre Retreading

The Retread is the process of retreading of bald tyres in which it is saved and reused the 80-90% of the material and by which you can save around 80% of the cost compared to the production of a new tyre. In the sector Tyres Retreading the Brushes are fundamental in every processing phase to guarantee the quality and the safety of the retreaded tyre.

SIT offers a wide range of Technical Brushes in brass-plated steel cord LIZ engineered and ideal for rubber brushing.

Initial inspection and Preparation of the Tyre to be Retreaded

The bald tyre casing is initially cleaned from mud and dirt using Cylindrical Brushes in synthetic or metallic filaments.
This processing is handy to the user to check more precisely and in safety the casing and not to dirt the retreading machine.
After the initial cleaning a closer inspection takes place with the help of automatic machines to verify the suitability of the tyre to retreading. If this is the case the user repairs with brushes some of the points before proceeding to buffing.

Industrial Brushes
Applied to Tyre Retreading

Inspection and Initial Cleaning Buffing of the Carcass Buffing of the Precured Tread Rolling of the Tyre Other Applications

Repair of the Casing

During the phase of Repair of the Casing in particular, the use of wheel brushes with 40 to 80 mm diameter with shaft or with hole with crimped wire filaments, mounted on electrical or air operated tools is indispensable to remove the rubber from small tyre craters, while the use of circular brushes with diameters ranging from 50 to 70 mm with shaft in filaments of crimped iron drowned in polyurethane is especially effective in the removal of rubber from the metallic net of the casing.

Crimped Wire Wheel Brush GG for Drill

Twist Knot Wheel Brushes GZ

Wheel Brushes GV in Vulcanized Crimped Wire

Cup brush in steel mounted on pneumatic drill used in the preparation of the casing

Tip end brush in brass-plated steel mounted on pneumatic drill used in the repair of the casing

Buffing of the Casing

Buffing machine for casing with SIT Brushes

Tyre casing brushed with SIT Brushes by buffing machine

The operation, which is indispensable to remove the used part of tread still attached to the casing, is possible thanks to the use of Liz Wheel Brushes in strand iron with external diameter from 100 to 230 mm and width variable from 15 to 65 mm which, used after some roughening using metallic rasps, allows to brush the sides of the casing, but also thand cleaning and the removal of small quantities of rubber in the central part, making the casing completely rounded in order to obtain a better performance of the tyre on the road.
Liz Wheel Brushes with shaped profile in steel are used for brushing/cleaning the beads of the casing.

Choosing the Brush for Buffing

Wheel brushes RW for buffing machines in brass-plated steel cord LIZ

D	E	S	C	F*	Max RPM	Box	ART	LIZ Steel Cord REF
100	23	11	38	-	6000	1	RW 4103	9600
120	17	21	38	-	6000	1	RW 4122	9601
130	32	26	38	-	6000	1	RW 4134	9602
140	32	20	58	-	6000	1	RW 6144	9603
150	23	36	38	-	6000	1	RW 4153	9604
150	32	36	38	-	6000	1	RW 4154	9605
150	18	25	58	-	6000	1	RW 6152	9606
150	25	25	58	-	6000	1	RW 6153	9607
150	32	25	58	-	6000	1	RW 6154	9608
150	43	15	77	-	6000	1	RW 8154	9609
160	43	20	77	-	6000	1	RW 8164	9610
160	45	20	77	-	6000	1	RW 8165	9611
160	50	20	77	-	6000	1	RW 8166	9612
160	57	20	77	-	6000	1	RW 8167	9613
170	22	20	77	-	6000	1	RW 8172	9614
170	38	25	77	-	6000	1	RW 8174	9615
180	45	30	77	-	6000	1	RW 8185	9616
200	39	40	77	-	4500	1	RW 8204	9617
200	50	40	77	-	4500	1	RW 8206	9618
200	44	29	100	-	4500	1	RW 10204	9619
225	30	25	77	-	3600	1	RW 8223	9620
230	50	25	77	-	3600	1	RW 8236	9621
230	57	25	77	-	3600	1	RW 8237	9622
230	44	25	100	-	3600	1	RW 10234	9623
230	55	25	100	-	3600	1	RW 10236	9624

F* : For the standard read the page related to adapters for wheel brushes.
Or on demand we design special adapters based on a custom design by the customer

Buffing of Precured Tread

Technical roller brushes for buffing of precured tread

Detail of precured tread and pattern left by an SIT brush

Detail of precured tread and of pattern processed by the roller brush

Automatic machine for the Buffing of precured tread

Roller brush mounted on machine for buffing which brushes the tread

Roller Brush on automatic machine for buffing the tread

Brush SIT mounted on cleaning station for precured tread

Cylindrical Brushes for Building

Cylindrical brush in filament of nylon for building the lower layer of the tyre

Cylindrical Brushes in filament of nylon, suitably shaped, are used to build/add the lower layer on the tyre. More, with other cylindrical technical brushes in nylon, but of smaller size you can apply the sticking anticracking band upon the casing sides.

Machine mounting brushes used in the building of the lower layer

Brush wheel brush mounted on drill elettrico for cleaning vulcanization moulds

Other Applications

Wheel brushes or tip end brushes with shaft mounted on electrical or pneumatic tools are used for the Cleaning of the Vulcanization Mould in the hot retreading.
Moreover Linear Brushes in filaments of horsehair o in filaments of thin brass mounted on sheaths are used as withhold smokes, dust and fragments of rubber in all the the machines for tyres and for i the retreading process.

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Diagram of casing raspata alla quale viene applicato un tread pretrattato by SIT Brushes (Immagine da Matteuzzi - Machinend for la Tyres Retreading)