Packaging Operations
Sheet Coater
Wagner
1
Human Resources ______________________________________________________ To add value and lead by example
Training & Development Broomfield, Colorado 80021
Ball Packaging Operations
Note This manual has been developed for use with Ball training programs. It covers basic machine
principles, concepts, and typical procedures. It is not meant to replace Original Equipment
Manufacturer (OEM) manual(s). Do not use it when ordering parts—refer to the OEM manual for
your specific machine and model.
Important
Plant Standard Operating Procedures (SOPs) or Work Instructions (WIs) should always take priority
over a typical procedure in this training manual, as they will be specific to your plant and machinery.
Proprietary Notice
This material contains subject matter that is proprietary to Ball Corporation, and that is protected under
the copyright laws as unpublished works, under the trade secret laws, and under the terms of written
license agreements with Ball Corporation. No portion of these materials may be copied or used for any
purpose except as permitted under any written license agreement with Ball Corporation.
3
SECTION PAGE
Specifications……………………………………………………………………………5
Safety Limit Switch Arrangement ………………………………………………………7
Principles of Operation…………………………………………………………………..8
Material Flow Diagram.................................................................................................…10
Backlash Gear Arrangement........................................................................................…..11
Operating Controls and Procedures Chart ....................................................................…12
Install Composition Roller............................................................................................….13
Setting and Adjustments…………………………………………………………………26
Isoblade Scraper System…………………………………………………………………27
Suggested Coating Handling Procedures………………………………………………..45
Changeover Instructions ..............................................................................................…..44
Preventive Maintenance....................................................................................................47
Line Greasing……………………………………………………………………………47
Troubleshooting...............................................................................................................48
Wagner Sheet Coater
4
Description and Purpose
The Wagner 15 x 44 Sheet Coater is a machine used to apply coatings to sheets through a series of
rollers, at a precise time in precise locations and specified thicknesses. The coater is used for straight
coating applications behind an automatic feeder.
Capacities
Minimum sheet size 19" x 24" wide Maximum sheet size 42" x 42"
Speed Ranges
Maximum 100 sheets per minute Minimum 50 sheets per minute Rate of feed
is determined by the coating material and bake time.
Basic Dimensions and Weights
Approximate dimensions 14' long x 7' wide x 8' high Approximate weight 23,000
pounds
Motors and Drives Data
Drive unit is furnished to specific requirements of the whole system. Drives must be synchronized.
Normal ratings: 1,800-2,400 rpm 10 hp.
Services
(see Basic Assembly L115000-36 for locations) Air 45 PSI minute Exhaust
Optional by customer
Sheet Coater Wagner
5
Figure 1
Figure 2
Wagner Sheet Coater
6
Drawing D107100-18
Note: There is no standard wiring diagram for the coater alone. The coater is wired into the system for
the complete line.
Figure 3 Switch 1 Jam stops 2 Hand wheel guard 3 Composition roller guard 4 Composition roller gear guard 5 Composition roller lift When any micro switch is energized, coater stops operating.
Sheet Coater Wagner
7
1 When the sheets reach the coater from the sheet feeder, slow-down magnets control the sheet to achieve a gentle takeover by the coater lug fingers.
2 Lug fingers take the sheet to the register fingers. 3 Register fingers take the sheet to side gauges that register the sheet precisely. 4 The upper roller, or composition roller, applies the coating, which has been fed by the anilox
roller. 5 The lower roller, or scraper roller, acts as a backup. 6 The sheet passes over the discharge rollers and out.
Note: The minimum stopping period should be one complete revolution of the composition roller; at
100 sheets per minute, this would be 0.6 seconds.
Wagner Sheet Coater
8
Figure 4 Sheet Coater Wagner
9
Material Flow Diagram
Isoblade Scraper Arrangement
Coating is applied to the scraper roller through a separate connection from pump to lubricating channel
assembly. “Paint” scraper removes coating material.
Thinner is applied to the scraper roller through the felt pad bar assembly and is removed by the thinner
scraper.
ISOBLADE SCRAPER
Figure 5
Wagner Sheet Coater
10
Backlash Gear Arrangement
Figure 6
The backlash gear arrangement consists of a hardened steel plate gear mounted on the upper
intermediate gear and in mesh with the hardened composition roller gear. The plate gear is centered
around the hub of the upper intermediate gear and should bear against the lead surface of the
composition roller gear tooth while the upper intermediate gear tooth is driving the composition roller
gear. This scissor action eliminates the backlash between the gears.
Sheet Coater Wagner
11
There are three spring housings, each with an adjusting screw, and the pressure can be determined only
by experience and is dependent on the speed of operation and the pressure on the composition roller.
This pressure should not be so great that it causes binding of the teeth, nor so small that the scissor
action is ineffective.
Operating Controls and Procedures Chart
To set coater into operation:
1 Insert proper composition roller and bring it into operating position. 2 Install correct anilox roll for film weights. 3 Bring scraper and pans into operating position. 4 Set feed board for proper sheet length. 5 Bring #1 feed fingers to “timing” position. 6 Set side gauges at “timing” position. 7 Adjust pumps.
Wagner Sheet Coater
12
Figure 7
Sheet Coater Wagner
13
Figure 8
Wagner Sheet Coater
14
Figure 9
Sheet Coater Wagner
15
Figure 10 (refer to drawing on page 11)
Figure 11 (refer to drawing on page 13)
Wagner Sheet Coater
16
Figure 12
Sheet Coater Wagner
17
Anilox System
There are two blades incorporated in the unit, one plastic blade at the bottom of the chamber to scrape
off the excess coating from the anilox roller and one plastic blade at the top of the chamber to contain
the coating within the chamber.
Figure 13
Two nylon end plates are fastened at each end of the chamber and slide over the face of the revolving
anilox roller to totally enclose the coating within the chamber.
There are two drain holes in the anilox chamber for returning the coating back to the lacquer tank.
The bottom return hole has a flow control spindle to make sure the chamber is full of coating so as
to prevent starvation.
The catchment tray supplied is used as a return to the lacquer tank for the coating.
Setting the Blade to the Anilox Roller
Rotate both of the adjusting handles (1) counterclockwise until both blades are just touching the anilox
roller. Start the anilox roller rotating, and then turn on the lacquer pump to send coating into the blade
chamber. Wagner Sheet Coater
18
Figure 14
Set the flow into the chamber with the flow control lever (it is important that the flow is not at full
pressure as this will cause flooding). The coating should return out of each end plate at the speed of a
slow running tap.
Make final adjustments to the pressure of the blades by turning the adjusting handles (1) by
approximately half a turn counterclockwise. Do not have excessive pressure on the blade as this wears
the blade prematurely. Tighten clamping screws (2).
The blades are now set and do not need to be adjusted when cleaning or changing rollers. Sheet Coater Wagner
19
Figure 15
Figure 16
Wagner Sheet Coater
20
Setting the Anilox Roller to the Applicator Roller
Figure 17
Make sure the quick release handle (3) is locked in the UP position. Undo locknuts (4). Turn knurled handles (5) clockwise to move the anilox roller and chambered blade together onto the applicator roller. Once set at the required pressure, tighten the four locknuts (4).
To remove the anilox roller from the applicator roller, place the quick release handle (3) to the DOWN
position. This will separate the rollers by approximately 0.25" while keeping the gears in mesh.
Figure 18
21
Sheet Coater Wagner
Replacing Blades
Release the clamping handle (6) and rotate the chamber to its horizontal position. Loosen the blade
clamping screws (7) and remove the old blade (protective gloves should be worn at all times when
handling blades).
Figure 19
Cut a new blade to length, ensuring the edges are as square as possible. Care should be taken to make
the blade as close as possible to each nylon end plate, but not too long as to cause a ripple in the blade. Wagner Sheet Coater
22
Figure 20
Position the new blade under the clamping strip; ensuring the blade is pushed back as far as possible to
the step in the blade housing. Retighten the blade clamping screws. Repeat the procedure for the other
blade.
Rotate the chamber to its original position and retighten the clamping handle (6).
Changing the Roller
Retract the anilox roller from the applicator roller and wrap around the protective blanket provided.
Screw the “eye” bolts through the cap and into the roller at each side. Lower the hoist beam and put the
hooks through the “eye” bolts. Remove the two caps and lift out the roller into the trolley.
Remove the “eye” bolts and caps and place in the anilox roller required for the next job, making sure
the arrows on the caps are facing outward. Lift the roller into the unit, ensuring the drive peg at the
operator’s side is positioned in the hardened sleeve. Replace the screws in the caps and release the hoist.
Sheet Coater Wagner
23
Figure 21 Cleaning the Unit
Pump solvent through the unit while the chamber is in the coating position and the machine is running.
This will clean the pipe work, blade, and anilox roller.
Remove the infeed pipe from the back of the blade before retracting the blade. Wipe the anilox roller,
chamber, and catchment tray with a solvent wiper. While cleaning the chamber, wear protective gloves
at all times.
For more detailed information, see the “Wash Up” section of this manual.
Wagner Sheet Coater
24
1 Adjusting handle 4. Lock nuts 2 Clamping screws 5. Knurled handles 3 Quick release handle 6. Clamping handle
Figure 22
Important: Perform all actions in the manner stated in this manual. Ensure you know how to stop the machine. Keep the anilox unit and surrounding area clean and tidy. Wear protective gloves when handling blades or cleaning the chamber.
Sheet Coater Wagner
25
Figure 23
Wagner Sheet Coater
26
Isoblade Scraper System
The Isoblade scraper system uses a sharpened steel blade submerged in a reservoir of
coating material to clean the scraper roll. Although similar to the LTG scraper system, there are a few differences. The scraper blade is separate from the chamber. The front wall of the scraper trough
(chamber) is a spring steel (referred to as a “spring blade”). The scraper blade is mounted independently a support arm which traverses the coater. Air cylinders push the spring blade against the scraper blade at a stroke, preset by Crabtree, when they install the unit. Scraping air pressure is adjustable and can be set to a minimum value to give reliable scraping while maximizing roll and blade life. This arrangement has the major advantage in that the loading and consequently the wear across the blade are equalized.
Each new blade has to be bedded in, then the scraper blade should not be disturbed
unless it is being cleaned. The trough will move away from the blade for cleaning purposes. The trough, blade holder and support bar should be cleaned at each wash up.
During a wash up, the coater may be inched slowly, when the trough is empty, in order
to clean the scraper roll. This will probably require one rotation of the scraper roll. In general, however, the machine should not be started unless the tough is mated to the scraper blade, and the trough is filled with material.
Wagner Sheet Coater
27
Scraper Blade Change
NOTE: The blade, blade holder and support beam MUST be regularly cleaned. Changing the blade 1 Stop the machine. 2 Proceed as for a job changeover, including wearing personal protective equipment. 3 Remove the scraper trough drain plug and allow the trough to drain. 4 Retract the trough by simultaneously pressing both pushbuttons on the control station
for a minimum of 5 seconds. 5 Fit a protective cover onto the working edge of the blade.
WARNING Sharp edge. Will sever hands. Fit the protective blade cover to the blade before handling. Fit and use the supplied handles to carry the blade and holder. Always use protective gloves.
6 Using the supplied handles pass these over the trough. This procedure requires 2 people, one person for each handle.
7 Locate toggles in blade holder holes at each side and ensure the toggles drop to lock the blade on.
8 Before lifting the blade and holder, recheck to ensure the blade protection strip is fitted. 9 Loosen operator side clamp. 10 Move the blade holder to the operator side first to disengage drive side location pin by
sliding along the beam. 11 Lift up the non-operator handle first to raise this side of the blade holder up and towards
the trough and follow through with the operator side handle. Drawing the blade and holder over the trough and under the delivery belts. The blade holder should be guided over the top of the trough between the side cheeks.
12 The blade holder should be placed on a level surface before the handles are removed. 13 See procedure for changing the blade and setting it in the blade holder.
Wagner Sheet Coater 28
14 This is the time the trough cheeks, spring blade, scraper blade holder, the scraper
blade support beam and stops can be thoroughly cleaned. 15 Before replacing the blade and blade holder back on to the support beam ensure the
blade holding handles are securely fitted with the toggles engaged and the blade protective strip is fitted.
Notes concerning blade bedding-in During the process of blade bedding-in the surface contours of the roller and blade edge become microscopically matched, mating together perfectly. During this period of blade bedding-in the blade and roller wear rates are extremely high possibly ten times or more that for normal running. The bedding-in period is therefore the most damaging to blade and roller and should be minimized. That is it should be done only once per blade. Every time the blade is moved away from the roller or is even slightly disturbed the blade has to be bedded-in again at high wear rates. This will dramatically shorten the life of the blade and the roller. If this is common practice then blades will often be worn out before they are bedded-in. Blades should not be moved or even microscopically disturbed once they have bedded-in. It is therefore good practice, if there are many changeovers, to leave the blade against the roller without reducing the air pressure. In this way it is guaranteed the blade will not be disturbed and will not require bedding-in. A good indication as to whether the blade has been worn out is to measure the width of the wear land across the tip of the blade. This is the worn mating surface with the roll. If the wear land has increased to 0.0008 inch (0.20mm) then the blade is worn and should be reground. Less than 0.0005 inch (0.13mm) and the blade could be used again. Replacing the blade and bedding-in The blade and blade holder are mounted on the crossbeam with the M8 cap screw heads facing the compression roller. The holder is axially positioned between the blocks on the beam, the non-operator side block is factory set to the edge of the compression roller and should be used as the datum side. 1 Make sure the trough is in the retracted position. 2 Ensure the blade has its protective cover fitted to avoid damage to the blade’s edge
and to avoid accidents. 3 Pick up the new blade and holder with the handles, making sure the bolt heads will face
the roller and the nuts or clips on the handles are secure.
4 Move the blade holder into position by using the handles to maneuver the holder under
the trough and up on to the beam. The reverse procedure from removing the blade. Take care to protect the blade.
5 Engage the blade on the beam with the drive side firmly against the datuming (non-
operator side) stop, with the pin engaging in the slot/hole of the blade holder.
Wagner Sheet Coater
29
6 Some versions of the blade holder (fitted with a hole) require the feed-side stop to be
moved and positioned to engage its pin into the blade holder’s hole. The stop should then be locked in position.
7 Remove the protective blade cover prior to operation on the blade against the compression roller.
8 Simultaneously press both pushbuttons on the control station for a minimum period of seven seconds to engage the trough.
NOTE Air cylinder rod lengths are factory set so that at 80psi (5 bar) excessive movement of the actuation levers are prevented. This limits the blade deflectors to between 8 to 9mm at the spring blade tip.
9 For bedding-in, start initially at 30 psi and run the roll slowly at first building up speed to 6000 sph. After one minute increase the pressure to 40 psi. After a further minute at this speed increase the pressure to between 50-60 psi (3.5-4 bar). If there are lines of coating showing on the roller caused by nicks in the blade, increase the pressure further to 80 psi and run it for as long as it takes to clear the line. Badly ground blades with nicks could take up to one hour to clean the roller.
10 Drop pressure to just stop lacquer passing. This may only be 20 psi for running. 11 As the blade wears the pressure may be increased.
CAUTION The blade will be damaged if the machine is run with the blade pressurized and the trough empty or filled to below the blade tip.
Wagner Sheet Coater
30
SETTING THE BLADE The blade will require resetting after regrinding or replacing. A fixture and setting gauge are provided to accurately set the scraper blade, this fixture should be permanently mounted on a bench or table. It is advisable to mount the setting fixture at an angle so that the blade holder drops down to the datum rollers. 1 Place the blade and holder on the fixture with the ‘V’ of the holder against the two end
gauging blocks and clamp in position with the toggle clamp. 2 Remove the protective cover from the blade. 3 Loosen the clamp screws. 4 Turn the adjusting set screws to set the blade to the gauge. 5 Align the blade to the holder on the right hand (drive-side) edge, so that the blade and
holder edges are flush. (Some setting fixtures are fitted with a datum stop). 6 Retighten the clamp screws. 7 Replace the protective cover.
Wagner Sheet Coater
31
OPERATION OF PNEUMATICS Sequence of Operation 1 The green indicator on the switch console must be indicated before the cylinders can
be actuated. 2 Press both switches simultaneously and keep depressed for SEVEN seconds. 3 The blade will now be deflected against the compression roller. 4 If the sequence is interrupted before the time delay has elapsed (i.e. releasing one of
the switches) the cylinders will exhaust and the scraper will return to its rest position – you should now continue from step 2 again.
5 When the trough is engaged it can be returned to its rest position by pressing both
switches simultaneously for FOUR seconds until green indicator goes off and then release both switches.
6 The green indicator should be present in order to start sequence again.
IMPORTANT NOTE
If step 5 is interrupted, the cylinders will retract but the system will require resetting. Pressing both buttons simultaneously until green light goes off and then releasing buttons can reset it. The system is now ready to start the sequence.
Wagner Sheet Coater
32
Set Feed Board for Proper Sheet Length
Figure 29
Figure 30
Wagner Sheet Coater
33
Set the Slow-Down Magnets and Adjust the Stop Magnets
Figure 31 Note: The proper speed of the slow-down magnets is the speed required to keep
the back edge of the sheet in contact with the face of the #1 feed finger during the
gauging cycle. It should not be so fast that it pulls the sheet away from the finger nor
should it be so slow that it causes the sheet to buckle. The proper speed can only be
obtained by experience through the trial and error method and is dependent on such
factors as sheet size, sheet weight, and speed of feed.
Sheet Coater Wagner
34
Adjust Speed of Front Slow-Down Magnets
Figure 32
Figure 33
Wagner Sheet Coater
35
Figure 34
Setting #1 Feed Fingers
For “A” gauging, the outer two fingers should be used and the center finger retarded approximately
1/8". For “B” gauging, the center finger is used while the outer two are retarded 1/8".
Figure 35
Sheet Coater Wagner
36
Figure 36
Wagner Sheet Coater
37
Taking Up Slack in #1 Feed Fingers
Figure 37
Figure 38
Wagner Sheet Coater 38
Setting Pneumatic Side Gauges
Figure 39
Wagner Sheet Coater
39
Figure 40
Setting Side Gauges for “A” Gauging
Figure 41
Sheet Coater Wagner
40
Note: The #2 feed fingers must be repositioned for every change of sheet length.
Figure 42
Figure 43
Wagner Sheet Coater
41
Figure 44
Note: The tension on the #2 chains will be maintained automatically by the counterweights at the front
end of the machine. Wagner Sheet Coater
42
Figure 45
Figure 46
Wagner Sheet Coater
43
Setting Backlash Gears
This is only done upon replacement. Contact someone with previous experience.
Figure 50
Wagner Sheet Coater
44
1 Clean the coater thoroughly between different coatings. 2 Read and refer to the product data sheet and the material safety data sheet. 3 Check the date of manufacture of the coatings. 4 If the material is stored outdoors or in an unheated area, allow the material to come up to room
temperature before using, or thinning may be required. 5 Mix the coating thoroughly per instructions. 6 Use only clean tools and vessels for mixing and transporting coatings, thinners, and additives. 7 Check viscosity of each drum and adjust as required. 8 Use only approved thinners and additives. 9 For all additions use accurate measurements and blend thoroughly. Use the amount
recommended. 10 Add thinners and additives to coatings under agitation or as recommended. Each addition should
be stirred in separately. 11 Check viscosity, coating weights, and oven settings periodically. 12 Visually inspect coated plate periodically. Run standard QC tests to assure that fill properties are
acceptable. 13 Coating and thinner should be at room temperature for best results.
Sheet Coater Wagner
45
To Change Sheet Size 1 Sheet length adjustment may be made by moving feed board to coincide with scale located on
the operator’s side of machine. 2 Adjust side gauges. 3 Run sheet and inspect lay of coating; for front to rear change adjust composition roller, for side-
to-side change adjust side gauges. Run sheet and check film weight, adjust per quality assurance standards.
4 Run more sheets adjust speed of slow-down magnets for smooth take over by lug fingers. 5 Adjust timing, if needed. To Change To End Plate
Change roller and feed board (no side guides are needed since registering of the sheet is not
necessary). Side gauges may be used for pre-gauging.
Wagner Sheet Coater
46
Line Greasing
Daily Per Shift
1. Anilox system.
Weekly
1 Registration assembly. 2 All drive gears (open gear grease). 3 Feeder. 4 Take-away bearings/pulleys. Monthly
1 All grease fittings. 2 Check/fill all gearboxes (feeder and oscillator use worm gear oil, all others use 90 weight). 3 Slow-down magnets.
Wagner Sheet Coater
47
Problem Probable Cause Remedy
Failure to register front and rear
Composition roller not positioned properly in relation to sheet.
Adjust composition roller clamping device.
Excessive backlash in the anti-backlash gears.
Adjust anti-backlash gears.
Looseness in the composition roller mechanism.
Tighten up all parts in the compo-sition roller gear-clamping device.
Feed board not set at proper scale and location in relation to sheet size.
Adjust feed board to size of sheet.
Cocked sheet because one feed finger is ahead of the other.
Adjust feed fingers to be directly in line with each other.
Stop magnets are set too high or too low.
Lower or raise magnets.
Improper take over between lug and feed fingers.
Align lug chain so that each set of lug chain fingers exactly align. When chain lengths differ, chain wear is probably the cause; there-fore, new sets (both sides) are recommended.
Pusher chain tension. Adjust chain tension. Gearbox possibly bad.
Pusher head assembly. Inspect assembly for stripped bolts, broken pins, or broken spacer between head and chain.
Out of register plate. Check with lead man/experienced operator.
Failure to register side to side
Improper setting of side gauges. Reset side gauges. Check air pres-sure setting (should be 1-5 pounds).
Improper setting of pre-gauging. Reset pre-gauging. Out of register plate. Check with lead man/ experienced
operator. Dirty backs (smudging of sheet)
Scraper knife not cutting (removing paint/coating from scrapper roller).
Change thinner (depends on con-tamination level). Check for blown felt, change if necessary. Pull scraper knife, clean/ sharpen as necessary. If thinner gets contam-inated quickly, sharpen coating knife.
Dirt or foreign matter on chrome slides, belts, and chains.
Clean off with solvent.
Wagner Sheet Coater
48
Problem Dirty backs (smudging of sheet) (continued)
Probable Cause Excessive roll pressure.
Remedy Adjust roll pressure. Note: Some high film weight coating will transfer to backs, example 181444 (buff).
Bleeding Incompatible system.
Almost always requires new coating or ink selection.
Solvents of varnish dissolving ink vehicle.
Lower solvent power of varnish solvents.
Blocking Under cure of coating on either side. High winding or stacking temperatures. Stacking too high. Winding too tight. High humidity. High film weight. Excessive lubricant.
These remedies are self-evident.
Poor weight distribution on pallet bottoms. Reduce or replace lubricant.
Blooming Very incompatible internal lubricant. Reduce or replace lubricant.
Bubbling
Poor solvent balance. Excessive turbulence. High surface tension of solution.
Thinning. Reformulation. Reduce line speed. Reduce turbulence.
49
Burning Over baking Reduce bake.
Chattering Cratering (fisheyes)
Partially or totally overcooked batch. Over-aged batch. Over-aged premix. High viscosity. Gear slippage. Bad plate. Lubricant incompatibility. Solution contamination.
Thinning. Blend with fresh batch. Prebake plate. Replace with fresh solution.Thinning. Additives modaflow.
Crawling Poor solvent balance. Oily plate. Low wetting tension plate. Excessive film weight. High first zone air velocity.
Reformulate. Prebake plate. Thinning. Reduce first zone temperature.
Wicket marking Hot wickets Dirty wickets. Under cure of backside coating. High film weight with backside coating. Back side coating too thermoplastic.
Lower preheat zone. Change sequence.
50