HM Electronics HM2950 User manual

HM2950 Operating Instructions
HULME MARTIN HEAT SEALERS
HULME MARTIN
HEAT SEALERS
www.hulmemartin.co.uk

SAFETY INSTRUCTIONS – HEAT SEALING EQUIPMENT
A. Protection against hazards arising from the electrical equipment
1. Safety warnings and instructions in the operators instruction sheets and
attached to the machine should be followed with care.
2. The equipment has an earthed power cable with integral 5 amp plug to
BS 1363/A fitted with a 5 amp fuse. The panel mounted fuse holder on
the machine is fitted with a 3.15A antisurge fuse for additional
protection. If either fuse fails the reason should be investigated and the
machine inspected and tested to ensure that there are no causative
faults. Higher value fuses must not be used, as they do not provide the
required level of protection.
3. Ensure that the power is switched off and the cable plug is removed
from the supply outlet before any servicing is undertaken on the
product.
4. Increased user safety can be achieved if a residual current device
(RCD) is used in the supply circuit to the heat sealer. This applies
particularly in damp conditions but the equipment must not be allowed
to get wet, either from sealing liquids, cleaning or inclement weather.
Only specially designed water resistant sealers should be used in
these circumstances. Electrical components and internal wiring, unlike
the element assembly, are not all protected by the low voltage safety
transformer, which powers the element.
5. Switch off the power supply when the machine is not attended.
6. The equipment should be regularly serviced and subjected to Portable
Appliance Test procedures in accordance with the Health and Safety
Electricity At Work regulations 1989.
7. It is essential that only approved spares be used for servicing this
equipment. Incorrect element wire can result in excessive electrical
load on internal components, which can lead, to malfunction and
failure.
Note
Hulme Martin Heat Sealing equipment satisfies the Health and Safety
requirements of the Electrical Equipment (Safety) Regulations 1994, CE Low
Voltage Directive 2006/95/EC

B. Protection against non electrical hazards
1. The equipment is designed to be operated on a flat, level surface to
ensure machine stability. In the case of chain operated machines, the
equipment should be securely screwed or clamped to the workbench
using the flanges provided, to avoid dislodging the machine when the
pedal is depressed.
2. Heat sealing machines must not be used for packing flammable or
explosive materials unless specifically modified to do so.
3. When sealing PVC and some other plastic films, which may produce
potentially harmful fumes, adequate airflow ventilation or extraction
may be required.
4. The heating element and jaws can become hot during sealing and
adequate cooling time must be allowed before touching these parts of
the machine.
5. Care should be taken on machines fitted with cutting knives that the
blade is moved to a safe position before attempting to reach between
the jaws. On hand operated machines, which are pivoted at one end of
the pressure bar the knife will slide towards the pivot point when the
pressure bar is lifted. For safety ensure that the blade is positioned at
the pivot end before lifting the pressure bar.
6. A timer allowing a maximum heating time of 4 seconds controls the
heating cycle on impulse sealers. If the timer indicator light does not
go out at the selected time and heating continues, switch off the power
immediately and investigate the fault after removal or disconnection of
the element.
7. Repeated operation of the machine without sufficient cooling time
between cycles can cause accumulative heat build up in the element
resulting in poor seals, damaged elements and excessive temperatures
8. Ensure that hands and fingers are clear of the pressure bar before
actuating the foot pedal. The element will not operate until the
pressure bar is fully closed but some discomfort will result from the
pressure applied manually or by solenoid operated units.

IMPULSE SEALING EQUIPMENT
To ensure that satisfactory sealing performance is achieved and that
service life of consumable spares (such as element wire, Teflon and
rubber pressure pads) are maximised, it is necessary to understand the
operating principles of this type of equipment.
1. To adjust the heat setting for a particular thickness of material, the
power output is not varied, and varying the length of time that the
current passed through the element resistance wire effects adjustment.
The timer control allows infinitely variable time adjustment up to a
maximum of around 4 seconds.
2. When the red heating indicator light goes out the temperature has
reached its maximum and the polythene is molten to effect the weld. It
is important that before allowing the jaws to open for removal of the
polythene a short cooling time is allowed to enable the polythene to
solidify and to regain its original strength. On machines fitted with a
dual timer control, the cooling time can be pre set but on standard
machines with simple heating time control, the operator should allow
sufficient time for cooling before releasing the jaws. Depending on
material thickness a cooling time of 1 to 7 seconds is usually sufficient.
3. To complete the seal in the minimum possible time considerable power
is applied to the element for the short duration of the welding cycle.
The instantaneous temperature reached during the brief cycle is very
high, but close contact of the rubber pressure pad removes excess
temperature and prevents deterioration of the thin Teflon barrier tape.
4. It follows that if the pressure bar is released before the temperature
reduces to a level that the Teflon can withstand, it will deteriorate
rapidly and require premature replacement.
5. For this reason adequate cooling allowance is critical to the service life
of the Teflon. Although capable of withstanding up to 20,000 seals
before replacement, insufficient cooling time can cause burning within a
very short period.

6. If the Teflon is not replaced when showing signs of wear, the polythene
will stick and seal quality will deteriorate. Also the rubber pressure pad
will start to wear and if this is allowed to continue to the stage where
the surface of the pad is burnt and uneven, the resulting ‘air gap’
between the pad and element will reduce heat transfer and cause
further rapid deterioration of the Teflon. Excessive burning will
eventually result also in the element wire requiring replacement.
7. To avoid this ‘ vicious circle’ always operate the machine at the
minimum heat setting consistent with satisfactory seal quality. Allow
sufficient cooling time between each successive seal. When sealing
repetitively at high frequency reduce the heating time from its original
setting to compensate for residual heat build up in the element.
8. The micro switch is set to avoid application of power to the element
until the rubber pad is fully aligned and pressed closely to the Teflon to
allow the necessary heat transfer. The rubber pressure pad is
sufficiently pliable to accommodate several thickness’ of polythene, but
accidental closure onto thicker objects or attempting to seal bubble
pack material and heavy paper laminate gusseted materials will cause
deterioration of the Teflon for the reasons explained previously.
9. The rubber pressure pad, and element wire strip are easily replaceable,
but care in operating and maintenance of the Teflon barrier tape can
extend the service interval before element reconditioning becomes
necessary.
10. If the machine fails to seal, but the on off switch and indicator lights
show that the power and timer circuits are operating correctly, unplug
the element and check the condition of the resistance wire and Teflon.
Simple replacement of these low cost consumable spares will normally
restore the full performance of the equipment.

HM2950 POLYTHENE HEAT SEALER
STAINLESS STEEL
OPERATING INSTRUCTIONS
General
Before connecting the machine to the electricity supply, check the operating
voltage on the name plate attached to the base of the machine.
The wires in the mains lead are coloured in accordance with the following
code:
Green & Yellow Earth
Blue Neutral
Brown Live
Ensure that the machine is correctly earthed and connected to the mains
supply with a 5 amp fused plug.
The heating element operates at a reduced safety voltage and the machine
has its own 3.15 amp internal fuse, accessible at the rear of the body.
The power supply rocker switch on the right hand side of the machine is
marked '0' off and '1' on.
Operat ng Instruct ons
The HM2950 impulse sealer is fitted with a dual electronic timer controlling the
heating and cooling cycle. When sufficient pressure is applied to the pressure
bar, the audible 'click' of the micro switch and the illumination of the red LED
indicator light will confirm that the machine is correctly adjusted and that
power is being applied to heat up the element.
The heating time is variable between 0 and 3.5 seconds using the external
control knob. The cooling cycle is preset internally at approximately 3 4
seconds to ensure that the element is allowed to cool before the pressure bar
is released.
If the pressure bar is released before the LED light goes out, insufficient
cooling can result in premature wear of the Teflon barrier tape and other
consumable spares.

A setting between 3 5 on the control scale should be sufficient for normal
material thickness. If the machine is to be used repeatedly for thicker
materials, additional cooling time should be allowed. It is possible to adjust
internally, the present cooling time up to a maximum of 7 seconds for special
applications where this is required.
Serv ce and Ma ntenance
Replacement of the Teflon barrier tape, which covers the element, simply
involves unplugging the element. The self adhesive Teflon barrier tape can
then be removed and replaced. The element wire is also easily changed, by
removing the two retaining nuts at the bottom of the element to replace the
wire strip. To avoid damage to the transformer it is essential that only element
wire of the correct resistance is used and that it is wired in accordance with
the instructions supplied. Allowing excess wire to touch the metal body of the
machine can damage the electronic timer.
The rubber pressure pad can be removed for cleaning or replacement by
simply pulling it out of the pad retaining channel. Inserting approximately
50mm at each end of the pad holder and evenly working towards the middle
of it should refit the pressure pad. This will avoid the pad falling out during
use.
The machine is stainless steel to prevent corrosion. Although all external
components are fitted with water resistant seals to simplify cleaning and
increase safety and hygiene, the machine is not guaranteed fully waterproof.
The following consumable spares will enable the machine to be serviced as
required.
290 210 Element Assembly complete each
290 203 Teflon Barrier Tape pkt 5
290 205 Rubber Pressure Pad each
290 204 Underwire Insulating tape pkt 5
290 206 Resistance wire strips pkt 5
These machines are supplied with a spare element plugged to the back of the
machine.
When ordering spares please quote the serial number of the machine as
etched on the base plate. If special modifications such as wide seal elements
have been fitted to the machine ensure that the spares department are
informed when ordering these parts.

On/Off
Switch
Rubber pressure pad
Heater Bar assembly
Spare heater bar assembly
Indicator LED
Heating
control

Hulme Mart n Heat Sealers Duty of Care
Directive 2002/95/EC on the restriction of the use of certain hazardous
substances in Electrical and Electronic Equipment(RoHS)
The RoHS Directive stands for "the restriction of the use of certain hazardous substances in electrical and electronic
equipment". This Directive bans the placing on the EU market of new electrical and electronic equipment containing
more than agreed levels of lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyl (PBB) and
polybrominated diphenyl ether (PBDE) flame retardants.
All machines manufactured from 1
st
April 2006 comply with the above
directive.
Directive 2002/96/EC on Waste Electrical and Electronic Equipment (WEEE)
The WEEE Directive aims to reduce the quantity of waste from electrical and
electronic equipment and increase its re use, recovery and recycling.
From 1
st
March 2007 Hulme Martin machines are marked with the ‘crossed out wheeled bin
symbol’ to ensure they are dealt with separately from general waste. We can arrange to
collect machines that are no longer required and ensure they are either recycled or disposed
safely. We will record details of all collected and recycled machines.
WEEE REG No WEE/DB1381SS
Packaging Directive
Directive 2004/12/EC (94/62/EC). Whilst we are not required to register under this directive
we use minimal packaging to ensure your purchase reaches you in a first class condition.
Packaging used has been recycled wherever possible and can be reused or recycled by the
receiver.
EC Declaration of Conformity
Machinery Directive 2006/42/EC
The Low Voltage Directive 2006/95/EC.
Electromagnetic compatibility directive 2004/108/EC.
Our machines comply with the above directives. All new machines are built to
a high standard and subjected to visual and electrical tests at several stages
during their manufacture. Once assembled we produce test seals to ensure
quality standards are met. Finally every machine is Portable Appliance Tested
to ensure electrical safety requirements are met.
ISO 9000 Quality Management
Hulme Martin Heat Sealers Ltd operates from documented quality management systems to ensure we meet our
customers’ requirements. We conform to the required directives as listed above, and our equipment meets CE
requirements. Customers are welcome to visit our factory to inspect our documentation and manuals.
ISO 14000 Environmental Management
Hulme Martin Heat Sealers ensures its activities causes minimal effects on the
environment. We continually monitor our practices to achieve the best possible
improvement on our environmental performance.

Warranty
In the unlikely event that it becomes necessary to return the machine for
repair or maintenance, please ensure that it is adequately packed to avoid
accidental damage and include your advice note detailing the date of
purchase and invoice reference number. Defects occurring from faulty
materials or manufacture will be repaired free of charge within the 12 month
warranty period provided that the machine has not been misused; is correctly
maintained, and has not been subject to unauthorised repair. Consumable
spares items such as the heating element assembly, resistance wire strips,
Teflon barrier tapes, rubber pressure pads and transportation costs are
excluded from the warranty.
HULME MARTIN HEAT SEALERS LTD
Un t 5B, Country Bus ness Centre,
Wh te Cottage Farm,
Lucas Green Road,
West End,
Wok ng,
Surrey
GU24 9LZ
Telephone [phone] Fax. [phone]
www.hulmemart n.co.uk