Styrene-isoprene block copolymers (SIS) are large volume, low priced commercial Thermoplastic Elastomer which are produced by living ionic copolymerization by sequentially introducing styrene, 2-methyl-1,3-butadiene (isoprene), and styrene into the reactor. Tpe Thermoplastic Elastomer content typically varies between 15 and 40 percent. When cooled below the melting point, SIS`s with a low styrene content phase-separate into nano-sized polystyrene spheres imbedded in an isoprene matrix whereas an increase of the styrene content leads to cylindrical and then to lamellar structures. Thermoplastic Polyamide Elastomers styrene domains function as physical crosslinks which provide mechanical strength and improve the abrasion resistance, while the isoprene rubber matrix provides flexibility and toughness. The mechanical properties of SIS elastomers with a low styrene content are similar to those of vulcanized rubbers.
As a kind of Rubber And Plastic,unlike Pvc Resin,Eva Resin or Pvc Paste Resin,Sis Rubber are often blended with tackifier resins, oils and fillers, Thermoplastic Silicone Elastomer allows for a versatile modification of product properties or they are added to other thermoplastic polymers to enhance their performance.
Thermoplastic Elastomer Sisare widely used in hotmelt adhesives, sealants, gasket materials, rubber bands, toy products, shoe soles and in bitumen products for road paving and roofing applications.
Thermoplastic Elastomer,Tpe Thermoplastic Elastomer,Thermoplastic Polyamide Elastomers,Thermoplastic Silicone Elastomer HENAN LIHAO CHEM PLANT LIMITED , https://www.lihaoche.com
2. Digital Display Controller Common Faults and Causes and Troubleshooting The following causes of malfunctions are as follows: Digital Display Controller Troubleshooting:
2.1 Symptoms - Digital instability (hops)
1) bad instrument grounding;
2) The power supply is unstable;
3) Power transformer shield open circuit;
4) The internal reference voltage and negative power supply have a fault;
5) Potentiometer bad contact;
6) 7107 damage;
7) The power supply filtering regulator is not good;
8) The room temperature compensation circuit and the reference power supply have bad foundations;
9) Automatic zero circuit damage;
10) Welds or connectors in the contacts, connectors or components in the watch;
11) The noise in the integrated op amp is too high.
2.2 Symptom - Output is 0mA
1) Output transistor damage;
2) The integrated op amp output is negative potential;
3) The bridge power supply is damaged or its circuit connection is open;
4) Output transistor emitter resistance or lead open circuit;
5) The output connection is open.
2.3 Failure phenomenon - output is 10mA
1) Output transistor breakdown;
2) The integrated op amp output has a positive potential to turn on the transistor;
3) Damaged integrated amplifier.
2.4 Failure phenomena - output instability Digital display controller troubleshooting 1) Excessive external disturbances;
2) The bridge power supply is unstable;
3) Welds on the device or solder joint;
4) poor connector contact;
5) The internal noise of the integrated op amp increases;
6) The power supply voltage is too low;
7) Output transistor characteristics are not good.
2.5 Symptoms - The monitor is not lit 1) The power transformer is damaged or the connection is open;
2) Fuse blown (open circuit);
3) Digital panel meter power connection open circuit;
4) The LED display is damaged.
2.6 failure phenomenon - display overflow 1) the input signal line in the table part of the open;
2) Damage to the amplifier power supply;
3) Integrated op amp damage;
4) 7107 damage;
5) The digital panel input is open.
2.7 Symptoms - Only "000" is displayed
1) Signal conversion part of the bridge power supply is damaged;
2) Damage to the amplifier power supply;
3) 7107 damage;
4) The integrated op amp is damaged.
2.8 Failure phenomenon - Incomplete display of characters 1) The LED display is damaged;
2) 7107 damage;
3) There is an open connection between the LED and 7107.
Troubleshooting method: When the above causes are determined, the damaged components are repaired. If they cannot be repaired, they can be replaced.
The digital display controller can quickly and accurately measure and display temperature values ​​and provide data information for print recording and data processing. With the development of science and technology, digital display regulators produced by China Instrument Electronics have been widely used in various fields of scientific research and production. The instrument will inevitably appear in one way or another in transportation, storage and use. This article briefly describes its troubleshooting, procedures and troubleshooting methods for reference by professionals. When the digital display controller used on the device is malfunctioning (damaged), the instrument maintenance personnel should not blindly repair it. According to the fault phenomenon of the instrument, determine the approximate location of the fault first, and then perform targeted testing and repair of the digital display control. Troubleshooting.
Digital Display Controller Common Faults and Troubleshooting
1. Judge whether the fault is inside the meter or outside the meter. The external wiring of the digital display controller has power, input signals and output signals. When abnormal phenomena are found, first use a multimeter to test the signal of the rear terminal. Within the required value of the meter. For example, when the meter power is not displayed, first check whether the power supply of the meter is abnormal. If it is normal and the meter still has no display, the internal power supply or related components of the meter may be determined to be damaged; when there is an overflow or a jump, the measurement can be measured. Whether the input signal has an open circuit or bad contact phenomenon. If an open circuit is detected, the fault occurs outside of the table. The open circuit of the signal can be found and can be normal after being eliminated. When the measured temperature is lower than the given value and the loop current meter is still zero , Can use the multimeter to measure the output signal of the rear terminal of the meter, normally it should be 10mA. If not, it means that the meter itself has problems. If there is, and the loop current still has no indication, it can be concluded that the fault occurs outside the meter, that is, the supporting ZK -1 There is a problem with the thyristor voltage regulator or ammeter that can be further searched and judged. By checking the signal on the rear terminal of the meter, it can be determined whether the fault is inside or outside the meter. When it is confirmed that the fault occurs within the meter, the fault can be further judged based on the fault phenomenon. The digital display of the fault is eliminated in the specific part of the meter.