Front Loading Oven
The JLS versatile front loading oven can be loaded by fork-lift truck or we can supply tailor made loading trolleys and trucks, powered bogie hearths and other innovative loading arrangements. This type of oven can be used in all industries and for all processes where batch production is required.
At JLS we can design bespoke Front Loading ovens to suit your requirement.
We can supply all industries with general purpose everyday use through to Aerospace with the high demands that the industry demands.
Make an enquiry or call us on: 01775 660517
If we look at the basics:
Airflow
Airflow is based on the duty of the oven and how it will be used in production. Horizontal airflow is normally good for ovens that have trays. Vertical airflow is normally good for heating from the bottom up.
Doors
These can be single or double doors, side hinged with robust shoot bolt fasteners.
If space is an issue the vertical lift design could be what you are looking for, these can be manual or power operated, with panel mounted raise/lower buttons or foot switch.
Door seals are generally glass fibre keyhole tape, but a combination or ceramic blanket seal and glass fibre rope is also used. For clean environments where the oven temperature is below 250 deg C, Silicone rubber seals are used.
Interiors
These are generally selected depending on the oven process. The most common would be Mild Steel painted with Heat Resistant Aluminium, normally used up to 540 deg C. For Temperatures above 540 then Stainless Steel, normally grade 304, would be used. Natural finish. For higher temperatures above 650 deg C then Stainless Steel of higher grade would be used such as 310 or Inconel. Depending on oven temperature the interiors are stitch welded, riveted or allowed to float to take up sheet expansion. For process that generate fume which would be an issue if allowed to seep into the insulation, then the interior sheets can be seam welded.
Temperatures
The range of temperatures are 50 deg C to 790 deg C.
Extraction
General purpose duties that do not generate flammable or toxic or heavy fume would have a natural vent with a manually operated damper. For process that generate a moderate amount of fume, an in-house fan powered exhaust can be fitted to give a positive extraction, clearing the oven interior of the fume during the process. For heavier fume a Bifurcated fan would be used. These are more powerful and will operate against a pressure in the ducting system. If flammable or toxic fume is generated an airflow proving switch is fitted to ensure the extraction is working. If the switch detects no air flow it will shut the oven down.
Explosion Panels
These are fitted if flammable vapours are generated by the process. Normally in an oven wall that has no restrictions. If fitted a free space must be allowed externally so as not to hinder a panel blow out.
Trays and Runners
These can be fitted to the oven interior for the load to be placed on. We have to consider not restricting the oven airflow so care has to be taken when designing these to ensure the airflow can still circulate freely. The trays are on runners so operator consideration must be given to ensure the load on the tray is not too heavy.
Racks
Racks are normally used for heavy loads, as they are free standing in the oven, so the load weight is on the floor not the side walls. Quite often these are fork lifted or pallet truck loaded into the oven.
Bogies
These are for heavy loads, normally flat top with suitable castors which can be run on the factory floor or on rails. Depending on the product weight they can be manually pushed in or out, or moved with fork lift truck or master mover. For very heavy loads these bogies can be power driven.
Controls
A wide variety of control systems can be fitted;
Set point control, set the op temp press start off it goes.
Programmable control, used when multiply process are going to be used in the oven or the process requires ramp and dwells.
Over Temperature Policeman, used on higher temperature oven and if oven will be left running unmanned. This system will, in the event of main control failure, shut the oven down until the fault is investigated. This is not an auto re set system, the fault must be cleared and the oven re started manually.
Recording
For some processes recording the oven temperature and time is critical. These are digital and come in many variations. It is possible to have a controller and recorder within the same instrument, the limiting factory is normally the amount of recording channels available.
Process Timer
These are used when a set point controller is used but you need a set time at temperature. The timer is set to start once the controller hits set point.
Timeclock
These are fitted to switch an oven on or off at pre set times. Used generally to get an oven up to temperature before a morning shift starts.
Heating Mediums
Electric heating elements, Natural Gas Burners, Steam, Hot Water.
Heating Controls
For electric ovens the heaters can be switched via a contactor for ovens that do not require high uniformity. Ovens that require tight uniformity the SSR is required.
Gas Control
The gas burners can be ON/OFF, HI/LOW or Modulating for greater control.
Uniformity
This is the guaranteed air temperature within a certain zone within the oven, measured away from any internal walls. The tighter the tolerance the more design input is required to ensure airflow, heating positions are correct. High quality ovens are +/-3.
Standards
Nadcap AMS2750 Aerospace. CQI-9 Automotive.
Sizes
Most of the ovens we build are Bespoke, specific to a customer requirement.
