Reeling & Spinning Section

 

 

SCIENTISTS:

  1. Sri N.B. Kar, Scientist–D (R&S)

 

 

OBJECTIVES:

Enhancement of productivity and quality of raw silk and technological evaluation of new mulberry silkworm races

 

 

ACHIEVEMENTS:

v     CB cocoons reeled on same day of steaming showed better results w.r.t reelability, recovery and silk yield-Nistari yields more raw silk and less droppages. [Ref: “Studies on the effect of pre-steaming of cocoons”, AR, 1979- 80 and 1980-81]

 

v     Hot air drying is found superior over sundrying w.r.t raw silk yield, recovery and reelability with Nistari cocoons [Ref: “Studies on the effect of sundrying Vs hot air drying of cocoons”[AR, 1980-81].

 

v     Intermittent drying is more advantageous over normal drying and Preservation. [Ref: “Studies on drying and preservation of mulberry cocoons” AR, 1981-82].

 

v     Deflossed cocoons have some good steaming effect which helps in better cooking. [Ref: “Studies of steaming effect on deflossed and undeflossed  cocoons” AR, 1981-82].

 

v     Indirect sundrying of cocoon gave better yield and quality of raw silk w.r.t renditta and reelability as compared to direct sundrying. [Ref: “Studies on indirect sundrying over sundrying” [AR, 1983-84].

 

v     85 deg.centigrade reeling bath temperature gave best results for reeling improved m.v. cocoons.[Ref: “Effect of reeling bath temperature on the properties of silk yarn” AR, 1987-88].

 

v     Quantitative and qualitative characters of reeling cocoons decrease gradually during storage of cocoons at normal condition.  However cocoons could be stored at 65+-2 and 25 deg. cent +-2 upto a maximum of 90 days without affecting its reelability [Ref: “Effect of storage on preservation of cocoons” AR-88-89 and AR, 1989-90].

 

v     Quality of cocoons deteriorates under normal storage, however storage under HDPE woven bags (tenable for maximum of 60 days) gave better reeling results as compared to storage in Hessian bags [Ref: “Studies on different storage techniques after hot air drying of cocoons” AR,1990-91].

 

v     A non-electric portable cocoon drying chamber was fabricated which gave 30-40% moisture removal in 6 hrs. at 90-110 deg. cent. Cost of drying is 65-80 P per kg fresh cocoons. [Ref: “Cocoon Drying – a solution”, Indian Textile Journal, Pp-130-33, 1995] [4kg cap.]

 

 

RESOURCES: 

1.     Semi-Automatic reeling machine

2.     Test Reeling Equipment (3 ends)

3.     Cottage Basin (Ghosh model)

4.     Country Charkha

5.     Spinning Machines

6.     Testing Equipments (Serigraph, Seriplane, Bobbin Winding, Cohesion Tester etc.)

 

ONGOING PROJECTS:

PPA 3366: Development of Integrated Package for Raising Chawki Leaves & Young Age Silkworm Rearing for Successful Cocoon Crops. [3y 10m]

 

PPA-3358: Organic Farming in Mulberry-An approach for Improvement of Silk Industry. [4y]

 

AIB-3393:  Development of Commercial Hybrids of Silkworm Bombyx Mori L by Identification of Bivoltine Parents Through Screening in Different Seasons of W.B.

 

OTHER PROGRAMMES:

v       Large Scale Testing.

v       Onfirm Validation of Project, AIB-3237 [Utilization of Polyvoltine Breeds

v       for Improvement of Survivals in Bivoltine Silkworm Bombyx mori  L.

v       Onfirm validation of botanicals & sericillin.

v       Onfirm validation of Project, AIB-3250 [Development of Rearing Package for Optimising Cocoon Yield in West Bengal].

v       Routine Programme on MVGPB, BVGPB, MSRAP]

 

TRAINING:  PGDS, Capsule on R&S and handicrafts.

 

CONCLUDED STUDIES:

Title:    Studies on the effect of reeling bath temperature on the properties silkyarn. (1985–88)

 

Result: It has been observed that cocoons can be reeled at high bath temperature of 75-850C to obtained better quality of silk evenness, cleanness and cohesion in particular.

 

Title:  Studies on drying in preservation of cocoons with special reference to its maximum reelability for Bengal condition. (1990 - 92)

 

Result: Dry cocoon storage under HDPE bag showed better reeling result as compared to Hessian bag.

 

Title:    Development of cocoon drying chamber suitable for West Bengal Condition. (1989 – 1994)

 

Result: Miniature type cocoon drying chamber of 4 Kg capacity has been designed and fabricated. But since the capacity of the drying chamber was too low, latter another drying oven of 15 Kg capacity was designed and fabricated. The machine was found very much suitable forWest Bengal rearers, who are used to rear 100 or 150 dfls, to prevent distress sale in adverse season.

 

Title:   Designing of Reeling machine suitable for West Bengal condition to reel N, Nx G & N x Bi cocoons. (1988 – 1994)

 

Result: A low cost reeling machine made of wooden structure and suitable for locally available fuel has been designed and fabricated. The machine was found at par with other cottage basin in terms of productivity but found superior in terms of quality.

 

Title:     Fabrication of drying oven. (1987 – 89)

 

Result:  Baking chambers of 10 Kgs and 250 Kgs capacity have been fabricated.

 

Title:    Fabrication of hand operated and coal/fire wood ignited cocoon drying chamber. (1984 – 87)

 

Result: A machine has been fabricated which can successfully dry the cocoon without harming the raw silk quality.

 

Title:    Studies on the steaming effect on deflossed and undeflossed cocoons. (1981 – 82).

 

Result: Deflossed cocoons have good steaming effect in terms of reeling efficiency.

 

Title:  Studies on the effect of sun drying Vs hot air drying of cocoons on their reeling characteristics. (1980 – 81)

 

Result: The superiority of hot air drying over sun drying in terms of raw silk yield and reeling efficiency has been confirmed. The recovery percentage in the hot air dried cocoons has excelled as high as 10.46% and recorded less renditta to a magnitude of 1.3 which implies its economical superiority

 

Title:    Studies on the effect of pre-steaming of cocoons on reelability. (1979 – 81)

 

Result: No significant improvement on quantitative & qualitative aspects. However, multi x bi F1 cocoons reeled on the same day of steaming showed better performance in all characters as compared to control (un-steaming)