In cases where it is not practical to assume that the web growth= is linear across the paper, a nonlinear web growth profile can be created = to capture the actual displacements from the base separation.

This topic provides nonlinear web growth profile examples for distortion= s occurring either across the web or across and around the drum.

**Example 1: Nonlinear web growth profile-across the web**<=
/p>

This web growth profile example uses the same displacement measurements = as in Table 1: Displacements from the yellow separation across a grid (see = Calculating web growth). It uses plate tower 1 for the black separation, plate tower 2 for the = cyan separation, and plate tower 3 for the magenta separation.

`<?xml version=3D1.0 encoding=3DUTF-8?>`

```
<=
!DOCTYPE profile SYSTEM WebGrowthProfile.dtd>
```

```
<profi=
le>
```

```
<measurePosition x =3D 1 y =3D 1 unit =3D mm /&g=
t;
```

` <measureShift x =3D 1 y =3D 1 unit =3D mm />`

` <plate tower=3D1 side=3DU>`

```
<xshift x=
=3D -886.8 dx=3D -1.38 />
```

```
<xshift x=3D -584.0 dx=3D =
-.82 />
```

` <xshift x=3D -252.0 dx=3D -.36 />`

<=
br>` <xshift x=3D -12.7 dx=3D .10 />`

```
<xshift=
x=3D 12.7 dx=3D .13 />
```

```
<xshift x=3D 315.5 dx=3D .64=
/>
```

` <xshift x=3D 584.0 dx=3D .95 />`

```
</plate><=
/code>
```

` <plate tower=3D2 side=3DU>`

```
<xshi=
ft x=3D -886.8 dx=3D -1.04 />
```

```
<xshift x=3D -584.0 dx=
=3D -.66 />
```

` <xshift x=3D -252.0 dx=3D -.36 />`

` <xshift x=3D -12.7 dx=3D .10 />`

```
<xs=
hift x=3D 12.7 dx=3D .10 />
```

```
<xshift x=3D 315.5 dx=3D=
.30 />
```

` <xshift x=3D 584.0 dx=3D .46 />`

` <xshift x=3D 886.8 dx=3D .78 />`

```
</plate&g=
t;
```

` <plate tower=3D3 side=3DU>`

```
<x=
shift x=3D -886.8 dx=3D -.52 />
```

```
<xshift x=3D -584.0 =
dx=3D -.30 />
```

` <xshift x=3D -252.0 dx=3D -.08 />`

` <xshift x=3D -12.7 dx=3D .10 />`

```
<=
xshift x=3D 12.7 dx=3D .08 />
```

```
<xshift x=3D 315.5 dx=
=3D .12 />
```

` <xshift x=3D 584.0 dx=3D .23 />`

=
` <xshift x=3D 886.8 dx=3D .40 />`

```
</plat=
e>
```

` </profile>`

```
```Note that the xshift element has two attributes: x, which is the horizon=
tal distance across the web, and dx, which is the displacement from the bas=
e separation.

The profile also specifies how the measurements are space=
d along the plate with the measurePosition element, and the measureShift el=
ement specifies the units used for the displacement measurements themselves=
.

**Example 2: Nonlinear web growth profile (across and around t=
he drum)**

In this example, measurements are made across the drum (on the x axis), =
and around the drum (on the y axis). Across the drum, measurements are made=
every 8 inches and displacements are measured in 1-millimeter increments:<=
/p>

<measurePosition x =3D 8 unit =3D inch />

<measureShift x =
=3D 1 unit =3D mm />

The x origin (the across-the-drum measurement) is at the centre of the p=
late, and so the left-hand x coordinates are negative, and the right-hand c=
oordinates are positive. If the plate is 44 wide, and the first measurement=
is 2 in from the left edge, this left-most x coordinate will be (44/2 - 2)=
/ 8 =3D -2.5. Because the measurements are spaced by measurePosition, they=
will have the x coordinates -2.5, -1.5, -0.5, 0.5, 1.5, and 2.5. The displ=
acement, dx, is simply the measured difference between a feature position i=
n the base separation and the current separation.

The y origin (the aro=
und-the-drum measurement) is at the plate's leading edge, and so the y coor=
dinates start from 0 and are always positive, but otherwise, the concept is=
the same as the across-the-drum measurements. The yshift element has two a=
ttributes, y and dy, which specify the y offset and the displacement in the=
y direction respectively. An example web growth profile with nonlinear web=
growth in both the x and y directions is shown below:

`<?xml version=3D1.0 encoding=3DUTF-8?>`

```
<=
!DOCTYPE profile SYSTEM WebGrowthProfile.dtd>
```

```
<profi=
le>
```

```
<measurePosition x =3D 8 y =3D 2 unit =3D inch /=
>
```

` <measureShift x =3D 1 y =3D 1 unit =3D mm />`

` <plate tower=3D1 side=3DU> `

```
<xshif=
t x=3D -2.5 dx=3D -1.584 />
```

```
<xshift x=3D -1.5 dx=3D =
-.720 />
```

` <xshift x=3D -.5 dx=3D -1.544 />`

<=
br>` <xshift x=3D .5 dx=3D .288 />`

```
<xshift x=
=3D 1.5 dx=3D 1.288 />
```

```
<xshift x=3D 2.5 dx=3D 1.578 =
/>
```

` <yshift y=3D .5 dy=3D -3.288 />`

<yshift y=3D 1.5 dy=3D 0 />

```
<yshift y=3D 2.5 d=
y=3D -2.578 />
```

` <yshift y=3D 3.5 dy=3D -4 />`

` <yshift y=3D 4.5 dy=3D -2 />`

```
<yshift =
y=3D 5.5 dy=3D 0 />
```

```
<yshift y=3D 6.5 dy=3D -2 /><=
/code>
```

` <yshift y=3D 7.5 dy=3D 0 />`

```
</pl=
ate>
```

` </profile>`

```
```

```
------=_Part_275_1154879158.1611716702512--
```