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Two Roll Mixing Mill Arranged In The Form May 10, 2017

Calendering is the process of making the rubber into a film or a semi-finished product of a rubber material on a two-roll rubber calender. It includes operations such as tabletting, pressing, pressing and spinning.

The two-roll rubber calender is usually composed of working rollers, racks, stands, transmissions, speed control and distance adjusting devices, roller heating and cooling devices, lubrication systems and emergency stop devices.

There are many types of roller presses, in order to meet the different process requirements, a total of two sets of rollers, three and four range.

The two rollers are arranged in a vertical and horizontal form.

Three roller arrangement in the form of vertical, L-type, triangular and so on.

Four roller arrangement in the form of L-type, Z-type and S-type and so on.

The number of rollers and the arrangement of them are very difficult for the operation of various processes and the quality of the semi-finished products.

According to the process to sub-points, there are two-roll rubber calendar, rubbing rubber roller rolling machine, universal two-roll rubber rolling machine, pressure-type two-roll rubber calendar, paste two-roll rubber rolling machine, Machine and so on.

Two-roll rubber calender: used to roll film or textile adhesive. Mostly three rolls or four rollers, the roller speed equal.

A rubber roll for a textile. Usually three rollers, each roller has a certain speed ratio, the roller speed is greater than the speed of the upper and lower rollers. The rubber is wiped into the fabric by means of the ratio between the middle and lower rolls.

Universal two-roll rubber calender: also known as universal two-roll rubber calender, both the role of the two two-roll rubber calender. Usually three rollers or four rollers, the speed ratio between the rollers can be changed.

Before the rolling, the need for rubber and textile pre-processing, that is, preparation process.

1.1 compound of the heat and glue

Before the compound enters the two-roll rubber calender, it is necessary to start it on the hot-melt machine. This process is called hot or preheating. The purpose of refining is to improve the uniformity of the mixing of the compound, to further increase the plasticity of the compound, to improve the temperature of the compound and to increase the thermoplasticity. Heat refining process is generally divided into two steps, are carried out on the miscellaneous, the first step is called refining, through the low temperature thin pass, so that the rubber becomes soft and uniform; the second step is called refining, roller distance, Higher, in order to improve the temperature of the compound, to obtain a greater thermal plasticity. While enhancing the adhesion of the compound to the fabric. Roughing roll temperature is generally 40 ℃ -45 ℃; roll distance 2-5mm; thin pass 7-8 times. And fine refining roll temperature is generally 60 ℃ -70 ℃; roll distance 7-10mm; refining 6-7 times.

Hot and the glue process: rough refining - fine refining - for the rubber - two-roll rubber calender rolling.

In order to improve the adhesive properties of the compound and the textile, to ensure the quality of rolling, the need to dry the textile fabric to reduce the moisture content of the fabric, the general control of water content within 1% -2%, the water content is too large will reduce the rubber Adhesion to the fabric, but too dry will make the fabric harder, in the process of rolling damage, reduce strength. Also in the drying process, the temperature of the textile is also conducive to rubber molecules through thermal movement to penetrate into the gap in the textile, rubber and textile to enhance the adhesion.

The drying of the textile is generally carried out on a vertical or horizontal dryer, and the dryer is a series of dry rolls. After drying the textile directly into the two-roll rubber calender rolling, can not be parked, so as not to moisture resurgence, so in fact the dryer is a two-roll rubber rolling machine composed of linkage device.