Notice for the additional pressure bar patent cradle at the rear draft zone

The birth of this new product is an important contribution of Jiayu to textile industry. For a correct understanding and application, it is herby to describe as  follows to help customers to make full use of this product.

◆ Design Principle

According to the law of movement and change of strand of fiber in the draft zone, it uses the additional control bar to establish a new additional frictional  force boundary at the rear draft zone. It could adjust and control the strand at  the rear zone rationally and consequently it could improve the evenness of yarn and allow draft in a wide range. It will increase the total draft ratio properly and ultimately it could increase the spinning productivity.

◆ Performance and Features

1)It applies on both front draft and rear draft zones to make full use of its effectiveness. It will not only increase the draft efficiency, but also improve the  yarn quality.

2)It is easy in erection and operation.

3) With minimum space occupation at the draft zone, it is beneficial to the operation and cleaning.

4)It has the best coincidence.

◆ Range of Application: 

1)Applicable spindle pitch: 63.5 ~ 75 mm 

2)Applicable draft: V-type draft and plain draft 

3)Applicable cradle: various spring cradles

◆ Operation instruction:

1) V-type products are applicable to V-type draft while B-type products are applicable to plain draft.

2) The difference between VI and VII and BI and BII is the different elastic action direction of the cradle but the operation method is same. The user should select the correct one according to the different spinning yarn.

It is worthy to point out that normally it should use two pressure bars for B-type cradle. However, single bar is available in view of the application effect   and yarn quality if the user worries about the complication of treading after strand breaks due to management and operation problem.

◆ Cautions:

The purpose of using pressure bar cradle is to increase the overall draft efficiency and optimize the yarn quality. However, the increased draft ratio will  direct effect upon the original spinning process and equipment adjustment. Therefore, it should pay attention following points in application:

1.A well matched process design is required between roving weight, twist coefficient of roving, back draft ratio and back roller setting 

2.The draft distribution should be scientific and rational. It should increase back draft properly when the weight is not changed and consequently it could  reduce the front load to improve the yarn quality.

3.To increase the roving weight, it should have an overall consideration such as raw material, kind of yarn, equipment running condition, management and technical level. A rational distribution is required when the draft ratio is increased. Don't put all at the front or back zone. The optimum draft ratio should be obtained through experiments.

4.It should increase the roving weight gradually. A sudden increase is not allowed. It should always follow up and observe each step and after it is stabilized the next step could be implemented otherwise a number of unexpected problem and trouble will be occurred.