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Product Range - Electrolytic Tinplate (ETP) Line

 

Electrolytic Tinplate undoubtedly enjoys the pride of place as a packaging medium especially for food. It owes its unique position to its "nine layer sandwich structure", each of which contributes to its eminence as a packing material. The steel base provides the necessary strength and formability for can fabrication. The tin-iron alloy layer provides the bond between the steel and free tin layer. The free tin layer is not only responsible for the attractive bright finish and ease of solderability but is also non-toxic- a factor of vital importance in food packaging!

       

Single Reduced Tinplates

Tailor-made within the following ranges:

Thickness - 0.18mm to 0.45mm
Width - 600mm to 1020mm
Cut Lengths - 457mm to 1125mm
Note: Tolerances as per IS 1993 : 2006 (ISO 1111-1 : 1983

Available in batch annealed condition in 4 categories of temper classification as per IS 1993 : 2006 (ISO 1111-1 : 1983)

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Temper Classification Rockwell Hardness (HR 30T)
T52 52+4/-4
T55 55+4/-3
T57 57+3/-3
T61 61+3/-3

Both Tinplate and TFS are available in the following finishes:
Stone = 0.45+/-0.1 Micron CLA
MAtt = 1.0+/-0.2 Micron CLA

Silver(ETP Only) – 1.0+/-0.2 Micron CLA

Coating Grades

Single Reduced Electrolytic Tinplate is available either equally coated or differentially coated in the following grades

Type Coating Code Nominal Coating Mass (gm/sqm) Min Avg Coating Weight (gm/sqm)
Per Surface Total Both Surface
Equally Coated E 0.56/0.56 0.56 1.12 -
E 1.12/1.12 1.12 2.24 1.8
E 2.8/2.8 2.80 5.60 4.9
E 5.6/5.6 5.60 11.20 10.5
E 8.4/8.4 8.40 16.80 15.7

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    Heavily Coated Surface Lightly Coated Surface Heavily Coated Surface Lightly Coated Surface
Differentially Coated D 5.6/2.8 5.6 2.8 4.75 2.25
D 8.4/2.8 8.4 2.8 7.85 2.25
D 8.4/5.6 8.4 5.6 7.85 4.75
D 11.2/5.6 11.2 5.6 10.10 4.75

 

 

Open Top Sanitary Cans (OTSC)

TCIL pioneered the introduction of OTS Tinplate years ago, and continues to be the domestic source for the entire range of OTS products be it A10, A12, A2˝, No.1 Tall and many others, matching both industry and customers' specification. Certified by CFTRI, a leading research centre in food technology, TCIL has emerged to be a major supplier of Tinplates for OTS products, a differentially coated ETP, available in both Single/Double reduced forms, ideally suited for packaging processed food like mango pulp, baked beans, pineapple rings, fruits and juices, mushroom, fish, meat, prawns etc.

 

Special Properties

ISV = 20 micrograms max.
Tin Grain Size = ASTM 9 or less numerically.

Note: Above coating properties are guaranteed on the heavier coated side.

Tolerances in coating weights are the same as given for Single Reduced Tinplates.

As per BIS specification (IS 1993: 2006) the marking system consists of parallel lines about one mm wide, the distance between the lines indicating the coating masses. Coating-wise line spacing given on Tinplate sheets is given below:

Code

Line Spacing

D 5.6/2.8

12.5

D 8.4/2.8

25

D 8.4/5.6

25 alternating with 12.5

D 11.2/5.6

37.5 alternating with 12.5

This may be modified as per feasibility and mutual agreement between buyer and supplier.

 

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Tin Free Steel

Post-liberalization days have witnessed a boom especially in the soft drinks and beer markets in India. Backward integration of our TFS line with the Cold Rolling Mill and TATA STEEL's Hot Strip Mill has given us the advantage to cater to a wide spectrum of superior quality TFS requirement of the market.

Tin Free Steel is an electrolytic chrome plated steel consisting of a thin layer of chromium and a layer of chromium oxide deposited on the steel base which gives it a beautiful, lustrous metallic finish on both sides. TFS offers outstanding corrosion resistance, lacquer adhesion as well as printability. No wonder it's an economical and high quality replacement for Tinplate, especially for the screw and crown cap market. Tin Free Steel (single/double reduced) is available in the same range of dimensions/ temper/ mechanical properties and oil film.

Coating Weight

Cr in Chromium Oxide

7 to 35 mg/sq.m/side

Metallic Chromium

50 to 140 mg/sq.m/side

Additional features of TFS

Filiform rust resistance - The filiform rust progressing as a filament externally beneath the enamel from scratches and similar defects under atmospheric corrosion. TFS has a better under film corrosion resistance than Electrolytic Tinplate

Sulphur Blackening Resistance - The metallic chromium in TFS has excellent sulphide resistance property when canning protein-rich foodstuff. TFS compensates for the expensive sulphur resistant lacquer, which would have been necessary for ETP

Coating - Unlike ETP, the coating in TFS is not amphoteric. Alkaline products such as detergents and dispersion colours can be packed in TFS with advantage.

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Double Reduced Tinplate Sheets

As early as in 1993, TCIL initiated a project to keep pace with global developments in consultation with some of the leading Can fabricators to evaluate the suitability of Double Reduced (DR) Tinplate as the packaging material for 15 kg Cans. TCIL has set up a 2-stand DCR mill backed up by the state-of-the-art technology obtained from SMS Germany and UEC, USA for the manufacture of DR Tinplate for the first time in the country & in 2008,TCIL double its tinplate capacity with state of art bliss DR mill with modern controls & system.

What are double reduced sheets?

Double Reduced material is normally thinner but stronger than conventional Single Reduced material. After an initial cold reduction and annealing instead of temper rolling, the steel is given a second cold reduction with lubrication, which gives work hardening effect and imparts additional strength to Double Reduced material.

Today TCIL is also capable of supplying excellent quality of thin strip DR for Instant Coffee packaging ,others OTS products etc in the range of 0.14 mm-0.24mm respectively. In fact, DR Tinplate can be a very cost effective replacement of Single Reduced Tinplate in almost all applications, which gives win –win situation for TCIL & its customer.

Salient Features of DR Tinplate

The salient feature of DR Tinplate is the combination of higher strength and sufficient ductility, which enables much thinner Tinplate to be used, compared to Single Reduced Tinplate resulting in Substantial economic savings.

According to the steel chemistry and annealing process, the second reduction (DR08) can be between 27% to 40%, thereby producing strengths upto 550 +/-50 N/mm2, whereas single reduced material has strength less than 450 N/mm2 &DR 09 (Hard DR) is produced at temper mill with reduction % in range of 27-35 % & will strength upto 690 N/mm2 to the produced material.

Soft Double Reduced Tinplate

Soft DR ETP is Double Reduced (DR48) material with temper T65+4/-3 and all other parameters same as 0.19 mm/0.20 mm Single Reduced Tinplate It is produced from 2mm HR coil unlike 0.19mm/0.20mm SR material, which is produced from 1.6mm/1.8mm HR coil. The Soft DR will be available in 0.18mm-0.22mm thickness with a brighter finish compared to 0.19mm SR.

Reason for introducing Soft DR

TCIL is currently supplying .19mmxT61/0.20mm spec. ETP to its customers. This spec. is produced from 1.6mm/1.8mm HRC which is very difficult to procure reason being, yield in making 1.6mm/1.8mm HRC is very low and does not justify realization from the customer, which invariably leads to poor compliance in all sizes including 0.19mm/0.20mm T61 made from 1.6mm/1.8mm HRC at our end. To counter this problem TCIL has developed Soft DR (DR48) produced from 2mm HRC which is easily available and can be used in place of 0.19mm /0.20mm SR, only difference being its Temper is T65 which does not have any problem at the customers end for T61 application.

Soft DR is already being used by all leading fabricators in India and has been a great success with respect to its performance and compliance at our end. 
Scope of Soft DR in Future

In the coming days there is going to be major problem in supplying .19mm SR tinplate as supply of corresponding 1.6mm/1.8mm HRC raw material is going to be much more scarce than before. Then Soft DR will be looked upon as the lifeguard for 0.19mm and 0.20 mm Tinplate. Therefore in the near future the Soft DR is going to witness its increasing importance and high demand.

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Passivation Film

3.5 – 6.5 mg/m2 of chromium per side (with 311 treatment) unless otherwise specified.

Oil Film

5 -12 mg./sq.m of DOS (total for both sides).

Mechanical Properties

Double Reduced Tinplates are available in the following grades:

Mechanical Properties of Double Reduced Tinplate

Temper Designation

Hardness AIM 30RT

0.20% proof stress AIM (MPa)

Characteristics

DR480 (Soft DR)

65 + 4/- 3

480 + 50/- 50

Moderate strength & stiffness

DR550 (DR08)

73 + 3/- 3

550 + 50/- 50

High strength & stiffness

DR620 (DR09)

76 + 3/- 3

620 + 50/- 50

Maximum strength & stiffness

Typical Applications

Baby Food, Milk Powder, Coffee Tins, 15 kg. Oil cans, etc.

DR Tinplate for Oil cans

DR Tinplate is produced for the oil can size sector in the following sizes, thickness and tempers:

Thickness

0.21/0.23 mm as against 0.27/0.28/0.29 mm for Single Reduced OC Tinplate.

Size

895 mm x 660 mm, 900 mm x 660 mm, 905 mm x 660 mm for the body and 764 mm x 1015 mm for the top/bottom sizes.

Temper

DR-08

Yield

Compared to Single Reduced Tinplate in 0.28 mm, the yield of 15 kg. Container in DR quality of 0.21 mm thickness will increase by 25% to 33%

Surface Finishes

Code

Classification

Roughness Value

Specific Finishes

B

Bright Finish

0.15 - 0.35

A luster surface provided by a flow-brightened tin coating on a smoothly grindstone finished steel base.

R

Stone Finish

0.30 - 0.50

A luster surface provided by a flow-brightened tin coating on a steel base characterized by a directional grindstone pattern.

SSF

Super Stone Finish

0.50 - 0.70

S

Silver Finish

0.80 - 1.20

A luster surface provided by a flow-brightened tin coating on a coarse dull finish steel base.

M

Matte Finish

0.80 - 1.20

A dull surface provided by an unmelted coating generally on dull finished steel base.

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