This document provides an overview of bladder curing presses and their components. It describes the bladder, which forms the inside surface of a tire during vulcanization. It explains the principle of bladder dimensioning and the components of a bladder mould. It then contrasts conventional bladder curing presses, which use a ram cylinder, with a newer compact design that lowers the head instead of raising the ram for faster opening and closing cycles. Finally, it lists the sizes and contact information for the manufacturer.

1. 1
Bladder Curing Press
May 2015 Volume 2, Issue 1
In This Issue
 Intro about Bladder & mould
 Compact design bladder press
Contents:
Bladder – Pg1
Bladder dimensioning – Pg1
Bladder mould – Pg2
Bladder curing– Pg2
Conventional press– Pg3
Compact design press– Pg3
Features– Pg4
Sizes offered – Pg5
Bladder
Curing Bladders are a flexible membrane that forms the inside
surface of a tire during the tire vulcanization process.
Bladder dimensioning Principle
Circumferential stretch:
Peripheral stretch:
In general, peripheral stretches should be between 10 % and 25 %
Bladder mould:

2. 2
It consists of the top and bottom half moulds, core ball & bead
flanges.
Bladder Curing:
The press is required to exert a pressure of not less than 3.5 MPa
(500 psi) on the cavity area of the mould. This is intended to
minimise flash and to ensure low thickness tolerances.
Conventional Bladder Curing Press:
It consists of a ram cylinder, side plates, bottom bolster, ejector
assembly, top beam and the core rod assembly

3. 3
Compact Design Bladder Curing Press:
1)Mechanical Structure
It consists of a Well cylinder, Base frame, bottom bolster, ejector
assembly, strain rods, shear lock assembly, top beam and core rod
assembly

4. 4
2)Features
1) Presses can operate on oil or steam heat (steam heat
operation features (3) temperature controllers: top mold half
/ bottom mold half / core)
2) The head is lowered versus raising the ram; faster closing /
opening cycles
3) Complete standalone unit (no pit required)
4) Run features are complete manual or auto operation
5) Bolster guided through the strain rods for proper mould
alignment.
6) Easy mould height setting with 8 locking positions in strain
rods.

5. 5
Contact Us
L&T Rubber Processing Machinery
Post Bag No.: 2, Vedal, Chennai-
Bangalore Highway
Kanchipuram – 631561.
Tamilnadu. India.
rpmsales.ltmbu@larsentoubro.com
www.ltmindia.com
Sizes offered:
Platen sizes: 42”, 55”, 90”
Footmark:
Details provided in this newsletter are only for information. Any
feature provided here is subject to change. Photographs and
sketches provided are only for illustrative purpose however
machines are built against specifications. Copyright reserved and
reproduction without prior consent is prohibited.