DeVilbiss SB-2-546 User Manual download pdf (Page 4)

The application of sap stain, toner and

overall stain establishes the base color

of the wood in preparation for the final

finish.

Sapping and Toning

Sapping, or the application of sap stain,

evens

out

the color variations in wood

pieces. Sap stain is generally used on

lighter areas of wood

darken

and

bring its color closer

average. In

many cases, special saps are needed to

blend a variety of woods together in the

same piece.

When done correctly, sapping equalizes

and blends the wood colors, giving the

finished piece better overall appearance

and color. When sap stain is applied

incorrectly,

can magnify variations in

wood color, as

well

as produce a

muddy finish. Building good habits in

operator technique helps the end result

remain consistent.

After the sapping operation, a toner is

applied

modify the color before the

application of the overall stain.

Overall Stain

The overall stain establishes the

undertone color of the piece. Consis-

tent stain application is the most

important factor in this step. On faster

production lines, two spray operators

are used

insure better uniformity.

Care should be taken

insure that both

operators' spray techniques are the

same. If a new or unusual stain is

applied, have the supplier work with the

operators

achieve a consistent finish.

An operator may need to change spray

techniques when using a different

material.

For lacquered or painted furniture,

tinted lacquer or enamel finish can be

applied in these booths in place of sap,

toner and overall stain.

Common Terms

The following list are terms commonly

used in sapping, toning and overall

staining operations.

Smooth

Coat

Stain

Non-Grain Raising (NGR)

Toner

Equalizer

Overall Stain

Sap

Thin Stain

Shading

Blow-up

Equipment Requirements

When spraying sap, toner or overall

stain, the typical fluid delivery rates

range between 4 and 10 ounces per

minute. We recommend the following

air spray and HVLP gun set-ups:

ss-

Air Spray Guns

JGV-570-705

(.042")

For Larger Pattern Size

MSA-501-704L

.042M)

MSA-501-35L

(.042")

For Larger Pattern

ize

For Smaller Pattern Size

HVLP Guns

Equipment specifications and diagrams

are

a separate fold-out found in the

back pocket of this booklet. Refer to

Diagram

for additional information

typical set-ups and flow ranges.

We recommend the following to achieve

the finest finish quality when spraying

during sapping, toning and staining

operations:

CleanAir" Air Control Unit

(Choose one)

HFRL-509, centrifugal,

2 regulated, 1 main,

CFM

HFRL-512, centrifugal/coalescer

regulated,

main,

CFM

See page 15 for other models.

Air Hose LSpecify Length)

H-1921

/I$

I.D.

Smooth

Cover or H-1901

5/~s"

I.D.

Corrugated Cover with

P-HC-4527

l/d'

NPS

(F)

three-

piece reusable swivel fitting.

-j

Fluid Hose (Specify Length)

For Solventborne Finishes:

H-1973-1

3/8"

I.D.

Nyliner

with P-HC-4548

3/8"

NPS

(F)

three-piece reusable fitting.

For Waterborne Materials:

H-1973-1

3/8"

I.D.

Nyliner

with P-HC-4561

3/8"

NPS

(F)

three-piece reusable stainless

steel swivel fitting.

(Specify Capacity)

For Solventborne Finishes:

QMGT Galvanized Tank

ASME Code) with or without

$501 2 Rotary Agitator or

PT Zinc Plated (Non-Code)

2-l/2 gallon tank with or

without Agitator.

For Waterborne/Corrosive

Pressure Tank

Materials

QMST Stainless Steel (ASME

Code) Tank with QSR-503

Respirator (size medium)

MSP-521 Dual Cartridge half-mask

silicone respirator

MSP-511 Dual Cartridge half-mask

rubber respirator

MSP-540 Air supplied half-mask

silicone !espirator

Also available in small and large sizes.

See pages 9 to 15 for further information

this finishing equipment.

Typical Furniture Finishing Setups

Refer

the foldout found in the back

pocket of this booklet for diagrams of

typical furniture finishing setups:

-Solventborne System with

QMGT Code Tank (see

Diagram

-Waterborne System with

QMST Code Tank (see

Diagram C)

Operating Tips

Operating an HVLP spray gun differs

very little from operating a conventional

air spray gun. Here are a few guidelines

to keep in mind:

Due to HVLP's higher transfer

efficiency, the fluid flow rate

must be lowered. Start with 15-25%

less than with a conventional gun.

Slower fluid flow particle velocity

requires that the gun be

held six to eight inches from

the target, compared to the

10 to 12 inch distance for

conventional guns.

Sap, toner and overall stain

procedures require similar

maintenance on both HVLP

and air spray guns. Some

general operating tips

include:

Check flow rates daily.

Clean build-up from gun tip and air

caps as required.

not use ball or needle valves

adjust air pressure. Use regulator.

Always use the lowest fluid and air

pressure possible by adjusting the

fluid regulators or pot pressure.

Lubricate gun aaiiy.

Before production spraying, test for

atomization quality, pattern shape,

pattern uniformity and proper shade

or color desired.

Stainless steel equipment recom-

mended for all NGR stains.

Aluminum wetted parts are

not recommended.

Reciprocating Agitator and

QMS-4010 Extra Sensitive

Fluid Regulator.

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DeVilbiss SB-2-546 User Manual Page 4

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