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SOP for Operation & Cleaning of Strip Packing Machine

OBJECTIVE
To lay down the procedure for the operation of the strip packing machine.

SCOPE
The operations should include the following;
  • Mounting and dismantling of rollers.
  • Adjusting of sealing pressure
  • Adjustment of cutting device (Horizontal cuttings).
  • Adjustment of feeding.
  • Adjustment of dropping of the tablets.
  • Adjustment of packing materials.
  • Vibrator setting.
  • Setting and adjusting batch printing attachment.
The operation applies to all strip packing machines.


RESPONSIBILITY
  • Operator: For proper running and handling of machine – setting coding, lubrication and cleaning of machine accessories, sealing pressure, cutting, dropping operating temperatures and vibrator adjustments etc.
  • Maintenance: For proper operation of equipment, attending to machine breakdowns and performing preventive maintenance.
  • Q.C: for checking equipments status whether it is producing quality or reject product.
  • Supervisors: for optimum output in obtaining satisfactory results over the life of the machine.

PROCEDURE
Mounting and dismantling of Rollers
  • Switch off the heater, untighten the locking rollers and pull out the heaters.
  • Untighten sealing pressure regulating stud to separate sealing rollers.
  • Untighten grab screws in sealing rollers cavities and pull out the rollers.
  • Remove back gears.
  • While mounting the rollers, reverse procedure.
  • Ensure that knurling on rollers inter lock properly.
  • The centerline of the rollers should be exactly above the centerline of draw brushes.
  • Should any adjustment be called for the left-hand roller shaft can be corrected by means of stud and nuts provided inside.

Adjusting of sealing Pressure
  • Check cavity alignment of the sealing rollers.
  • Tighten pressure setting stud for sealing pressure until the passing packing material is knurled and then tighten the stud.
  • For equalization of pressure gradually tighten setting stud until the packing material leaves the sealing rollers in correctly sealed position of over the web.


Adjustment of Cutting Device
  • After starting machine, ensure that both the cams for cutting device are functioning properly, one pushing the cutter assembly downwards and the other imparting scissors action.
  • Should the cutting not be exactly in the middle of cavities on the strips, the point of cutting can be adjusted by untightening the cutting gear.
  • Turn the hand wheel either forward or reverse depending on position of cut. Tighten screw when position of cut is established.

Adjustment of feeding Device
  • Fill the hopper with product to be sealed.
  • Ensure hoppers do not touch vibrator bowl. This can be achieved by a telescopic hopper stand, which also controls the feed rate to bowl.
  • Switch on control vibrator switch.
  • Adjust knob of dimmerstat to fill the product in the channels. The product will be stopped in channels by release pin.
  • Adjust level of bowl and chute by the 3 nos. of leveling screws.
  • The release pin can be locked in position by means of feed stopper.

Adjustment of dropping of the tablets
  • This can be affected by untightening the back cam gears.
  • Rotate the cam gear either direction depending on the tablet’s drop.
  • The movement of the release pin can also be adjusted by loosening screws in the release pin stopper and adjusting the rubber buffer.

Adjustment of Packing Materials
  • The feeding of the packing materials should be proper to cover the sealing area of rollers and also give proper width.
  • Adjustment of packing material roll can be done by means of screw and nut pair on packing material roll holding shaft by operating knob.
  • To avoid any misalignment and prevent formation of wrinkles the foil running shafts are given to keep the running foils in tight position.

Adjustment vibrator
  • Set the vibrator gaps relative to vibrations requirements.
  • Set the gaps of vibrations between the values of 140 to 160 volts for good operational values.

Batch Printing Unit

a. Installation
  • Mount Roller mounting bracket by means of 4 nos. bottles on machine body.
  • Mount Batch Printing Unit with mounting shafts by means of fixing 2 nos. bolts on mounting bracket.

b. Check up and Observe
  • While mounting the unit, the stationary roller should be parallel to the sealing roller (heating Roller).
  • Stationary roller should be in right angle to the body of the machine.
  • Main bracket should be in level with the top plate of machine.

c. Stereo Drum

To mount stereos:
  • Remove stereo drum from the mounting shaft.
  • Loosen the chuck nuts.
  • Remove rubber tiers.
  • Loosen the stereo rings (Poly Propylene) fix the stereos at required place.
  • Press the stereos firmly and see that all the stereos are in the same level.
  • Put back the rubber tires and tighten the chuck nuts.
  • Place the stereo drum to its position to mount the flat stereos on plain stereo drum.

d. Felt Roller
  • Remove felt roller from the mounting
  • Soak the felt with sufficient ink.
  • Fit the felt roller on the mounting shaft.

e. Operation and Observations
  • Pass the packing material through the stereo drum roller and stationary roller to the sealing junction (Roller).
  • Stereo drum is above the stationary roller and by the help of the packing material movements, the stationary roller is being rotated and in turn drives the stereo drum.
  • Observe the printing impression.
  • If printing impression is weak, then add a few drops of “Felt Type Ink” to the felt Roller.
  • If printing is very dark then;
  1. It means, too much ink is added.
  2.  Wait till sufficient time for the pad to absorb the ink
  3. If smudging continues, then add few drops (5 to 6) of printing aid on the felt rollers (printing Aid thinner)
  • Repeat the printing operation and if it needs pressure adjustment knob is to be adjusted.
  • If felt roller soaked inked ink – is enough, the print may last one to two hours.
  • Recommended ink- felt type ink and thinner.

f. Lubrication
  • Stereos drum, felt drum and stationery roller to be lubricated with grease once a month.

STARTING THE MACHINE

Checks
  • Ensure that all doors are closed, all moving parts covered. This prevents dust or powders from reaching the bearing surfaces.
  • Product should be free from dust and broken pieces before being loaded in the hopper.
  • The rollers should be cleaned by means of soft wire brush.
  • Feeding assembly, bowl, chute, hoppers should be dust free.

Lubrication
  • Grease the sealing roller shaft bearings daily.
  • Put few drops of oil SAE 40 on the catch shaft and cam followers for cutting device.
  • Cutting assembly dovetail slider should be oiled daily SAE 30.

Starting
  • Switch on the mains
  • Switch on the heaters
  • Set the TIC to the required temperature range
  • On/Off/Inch button should be on inch position.
  • When the pressure rollers have reached the required temperature, fix the feed throat (channel).
  • Switch on vibrator
  • Press inch button for trial run
  • If satisfied with machine performance, set On/Off inch button to run position.
  • Continue operation and observe the performance i.e. cutting, coding and dropping.

SAFETY

Electricals
  • Ensure that pilots’ lights are functional.
  • Loose wires and bare wires should be reported immediately (all wires to be covered).
  • Ensure that all panel instruments are working i.e. TIC, Ammeters and Variac.
  • Electrical terminal box should be closed always.

Mechanical
  • All moving parts should always be covered (cutting gears, cutting Assembly).
  • All abnormal noise should be reported immediately.
  • Always lubricate all moving parts at regular intervals.

CLEANING

Cleaning Procedure

During Batch Change Over.
  • Wear nose mask and hand gloves.
  • Remove the previous product and label and affix the label “TO BE CLEANED’’.
  • Switch OFF the mains.
  • Remove the adhered powder with the help of vacuum cleaner, followed by dry mopping with lint free cloth.
  • Dismantle the parts like Chute assembly, hopper, vibratory SS bowl and dust collector.
  • Remove the sealing rollers, clean with soft brass wire brush.
  • Dedust all other parts with vacuum cleaner followed by dry mopping with the help of dry cloth.
  • Clean the area and affix the label “CLEANED’’.

During product change over
  • Follow the step (During Batch Change Over.)
  • Transfer the detachable parts to washing area.
  • Scrub the detached parts with lint free cloth soaked in purified water.
  • Rinse with purified water.
  • Clean the non-detachable parts and body of the machine, with clean lint free cloth soaked in purified water followed by mopping with clean lint free cloth.
  • Clean the area, if found ok, affix the label “CLEANED’’.

At the end of the day
  • Keep all the material tightly closed and ensure the presence of status label.
  • Follow the step (During Batch Change Over.)

ABBREVIATION
  • TIC: Temperature Indicator Control
  • SS: Stainless Steel
  • SAE: Standard American Engineers

REVISION HISTORY
Nil

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