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Slitter: It’s Not as Simple as You Think

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Slitter is a simple cutting machinery used in tyre industry to slit the wider ply to narrow strips. Yet, its not as simple as the name sounds.

The contents of this post has been adopted from a newsletter shared with us by L&T Rubber Processing Machinery.

Slitter

Each slitter consists of

  1. Let-off Assembly
  2. Cutter Assembly
  3. Winder Assembly and
  4. Conveyor Assembly

Let-off Assembly:  You feed the material and the insulating liner into the slitter cutter area using a mobile cart known as let-off cart.

Cutter Assembly: As the name suggests, your ply is cut or slit through two to eleven cutters, that are arranged in a single-line assembly. Key features of this part of the assembly are

  • You can adjust the width of the output web using the manual slide option.
  • You can adjust the Ply tension using a pneumatic system.
  • The knife assembly is also adjustable.
  • Depending on your preference, you could also opt for Pneumatic knife cutter.

Slitter Knife Arrangement

Conveyor Assembly: After the web or ply has been slit, they are guided through a belt conveyor to maintain them wrinkle-free. Key features of this part of the assembly are

  • There is a yard meter for display so you could see the running cut length.
  • The assembly maintains constant line speed and web tension.
  • An equal spread of web is maintained.
  • Hand wheel is provided for you to adjust the conveyor belt tension.

Winder Assembly: The web or ply that has been cut by the knife assembly is wound using the winding mechanism on the mobile rewind carts.

These Slitters can also be identified as Stage 1 and Stage 2 Slitters.

Stage 1 Slitter – Here, you can slit the ply into two strips (each of 730 mm)  to a max of 12 strips (each of 120 mm). The wound ply obtained from 1st stage slitter on the winder cart can be used as an input in 2nd stage for further slicing.

Stage 2 Slitter – If you require the width of the ply strips to be narrowed further from 120 mm, then you could use a stage 2 slitter machine. Here’s how you do the second stage slitting.

  • The rewind cart from 1st stage slitter machine (output) is easily towed and moved into the 2nd stage machine as its Let-off Unit (input).
  • The cart is aligned on the fixed guide rails.
  • The web is gradually unwound individually from each drum at a time interval of 40-50 minutes.
  • The web is fed into the 2nd stage slitter and slit through a knife assembly into smaller widths.
  • The ply is rewound across “n” numbers of winders depending on your requirement.

A sample Slitter Machinery specification offered by L&T is as below:

  • Width of Supply Material:                        1460 mm (Maximum)
  • Diameter of Supply Material:                  1250 mm (Maximum)
  • Thickness of Supply Material:                 1.2 mm (Maximum)
  • Diameter of Supply Material Shell:        360 mm
  • Max chord angle for supply material:    0°
  • Supply Material:                                         Rubber / Nylon
  • Diameter of liner material:                       800 mm (Maximum)
  • Diameter of liner material shell:             360 mm
  • Trimming:                                                    Knife type
  • No of Knives:                                               02 to 11
  • Line speed:                                                   20 m/min
  • Width of output Layer:                             (730 mm x 2) to (120 mm x 12)
  • No of winders (Rewind carts)                  Two
  • Let-off material loading /unloading:      Manual
  • Cutter adjustment:                                     Manual
  • Setting liner-roller:                                    Semi-Automatic
  • Winding cart loading / unloading:         Manual

Summarizing a slitter is not as simple a rubber machinery as you think and suppliers offer you designs with various levels of automation to meet your requirement of slitting the ply or rubber sheet for your product applications.

Do you agree?

(L&T’s Rubber Processing Machinery business manufactures and markets machinery for the global tyre and rubber industry. The machines are produced at its facility in Kancheepuram, Tamil Nadu. You could reach out to them for customized solutions on rpmsales.ltmbu@larsentoubro.com.)


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Author: Prasanth Warrier

Co-Founder | #B2B Strategy, Marketing & BD Consultant | Speaker | Trainer | Enjoys Traveling, Reading & Meeting People | #SocialSelling | #Blogger | Knowledge Sharing | Blessed with Loving Family & Friends | Voracious Reader | Business Leader serving Rubber Industry

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