成形网的修补程序 en

WEAVEXX FORMING FABRIC PATCHING PROCEDURE
Position the hole in the forming fabric at a place on the machine that will provide good access and also allow for the placement of board stabilizers underneath the fabric. Fabric needs to remain under tension.
Use a nail clipper to remove any excess yarns that are sticking up, or protruding from the hole edges.
Place an untreated—unpainted board directly under
the forming fabric hole area.
First take 320 grit sand paper and apply moderate pressure to sand down the plane of the fabric surface. Sand at least1/4-1/2 inch outside the expected patch
size edges. Follow-up with 400 grit paper to get an
even smoother final surface. This is important to
insure a higher patch adhesion contact area percentage.
Forming Fabric Patching Procedure
Remove the board from under the fabric. Pour a high quality cleaning solvent onto sanded area and rub with a stiff bristled brush to remove contaminates. Repeatedly apply solvent and brush at least 3 times until fabric surface looks clean. The best solvent to use is Methyl Ethyl Ketone—If this substance is not permitted in your facility—use Methylene Chloride or 5% sulfuric acid wash instead.
The cleaned area must be thoroughly dried. Use a hair dryer. Do not use mill air hoses: this air source usually contains traces of oil, which would re-contaminate the fabric surface.
Once again place the board under the fabric hole. Now place a Teflon covered patching board on
top of this board. The Teflon covered board when heated by the iron will not allow moisture or
steam from the board surface to contaminate the patch as it is being applied.
Plug in your solid faced, Teflon covered iron, and allow it to begin to heat up. Allow temperature to stabilize between 340-350 degrees. At 400
degrees polyester will melt. At 425 degrees nylon
will melt. Do not exceed 350 F.
Forming Fabric Patching Procedure
Forming Fabric Patching Procedure
Take a scissors and cut out the proper patch
size from the forming fabric patch kit. Fine
wire mesh works the best. Cutting the patch
out in the same orientation as the circled
areas in the kit will insure a good 45-degree
mesh angle when the patch is applied onto
the fabric surface. Take care when handling
the patch to prevent excessive hand oils and
other contaminants from getting onto the
patch surface. When cutting out the
patch—cut entirely though the patch/wax
paper and paperboard backing material.
When you are lightly holding the cut out
patch you will be holding 3 separate layers
between your fingers.
Carefully lay these 3 sandwiched layers beside the
hole to be patched. Now take a tweezers and some
type of pick and carefully drag just the top fabric
patch (leaving the wax paper and paperboard backing
behind. If this is done properly, the adhesive side of
the patch will now be over the hole, against the
forming fabric's topside surface.
Precisely position patch over hole in equal directions. The elongated ends should be in the machine
direction.
Forming Fabric Patching Procedure
Recheck the iron temperature and set to 350 F.
Carefully position yourself with the iron in hand
above the patch area. In one smooth motion
apply the iron to the patch area. Apply even
moderate weight onto the patch for 10 minutes.
CRITICAL---DO NOT ALLOW THE IRON
TO TWIST—THIS WILL RESEPERATE THE
PATCH FROM THE FABRIC. AFTER THE
10 MINUTES—LIGHTLY LIFT AND MOVE
SLIGHTLY SIDEWAYS TO REMOVE THE
IRON.
CRITICAL---ALLOW THE PATCH TO COOL
DOWN NORMALLY—DO NOT
ACCELERATE THE COOL DOWN
PROCESS. BETTER ADHESIVE CURING WILL RESULT.
After the patch has cooled for approx. 10-15
minutes—check to see if patch looks stable. If patch
looks okay, very light 500 grit sanding can be
performed on any rough patch edges that may still
exist.
To extend expected patch life---The high-pressure
needle shower water pressure should be reduced to
100 psi or less if allowed.。