https://www.avient.com/products/engineered-polymer-formulations/structural-fiber-reinforced-formulations
Enhance your product’s appearance and feel with soft-to-the-touch elastomers
https://www.avient.com/sites/default/files/2020-10/luxury-closures-gravi-tech-design-guide-2.0-application-specific.pdf
Unfortunately, this method
only has limited durability and has a minimum
amount of assembly repeatability .2
FIGURE 19 - Mechanical Fasteners
Design Guidlines
Potential high stress
due to wedging action
of screw head
Potential high stress
due to wedging action
of screw head
Poor DesignsPoor Designs Preferred DesignsPreferred Designs
Planned gap between added
bosses prevents excessive
bending of hosing as bosses
touch and go into compression
Planned gap between added
bosses prevents excessive
bending of hosing as bosses
touch and go into compression
Alternative recessed head
design avoids potentially
dangerous wedging action
Alternative recessed head
design avoids potentially
dangerous wedging action
Truss or Round Head ScrewTruss or Round Head Screw
Potential high bending
stress as bolt is tightened
Potential high bending
stress as bolt is tightened
Flat-head Screw
Standard Screw
Plastic Part
Metal Sub-frame
Shoulder Screw
Plastic
Part
Metal
Casting
FIGURE 20 - Mechanical fasteners design guidelines
F=
π × µ × DShaft 1engage × σH
W
I = D – 0.373 = 0.0002"
σH =
1 × W
DShaft
W + v
E( )
σH = = 200psi
0.002 × 1.998
0.375 1.998 + 0.4
450000( )
W = = 1.998
1 – 0.375
0.650( )
2
1 + 0.375
0.650( )
2
W = DShaft
ODHub
1 – ( )2
DShaft
ODHub
( )21 +
FIGURE 16 - Interference fit variable
F=
π × µ × DShaft 1engage × σH
W
I = D – 0.373 = 0.0002"
σH =
1 × W
DShaft
W + v
E( )
σH = = 200psi
0.002 × 1.998
0.375 1.998 + 0.4
450000( )
W = = 1.998
1 – 0.375
0.650( )
2
1 + 0.375
0.650( )
2
W = DShaft
ODHub
1 – ( )2
DShaft
ODHub
( )21 +
FIGURE 17 - Geometry factor variable
F=
π × µ × DShaft 1engage × σH
W
I = D – 0.373 = 0.0002"
σH =
1 × W
DShaft
W + v
E( )
σH = = 200psi
0.002 × 1.998
0.375 1.998 + 0.4
450000( )
W = = 1.998
1 – 0.375
0.650( )
2
1 + 0.375
0.650( )
2
W = DShaft
ODHub
1 – ( )2
DShaft
ODHub
( )21 +
FIGURE 18 - Hoop stress equation
F=
π × µ × DShaft 1engage × σH
W
I = D – 0.373 = 0.0002"
σH =
1 × W
DShaft
W + v
E( )
σH = = 200psi
0.002 × 1.998
0.375 1.998 + 0.4
450000( )
W = = 1.998
1 – 0.375
0.650( )
2
1 + 0.375
0.650( )
2
W = DShaft
ODHub
1 – ( )2
DShaft
ODHub
( )21 +
FIGURE 19 - Press fit pull-out force
.400
.500
.375
.373
.650
FIGURE 15 - Press fit example
Design Guide 13
ADHESIVE TYPES
A chart containing the various specific adhesive
types, with advantages and disadvantages of
both can be seen in the appendix .
FIGURE 32 - Bubbler (left) & Ba�e (Right)
FIGURE 34 - Bubbler (left) & Baffle (right)
Part
FIGURE 35 - Series cooling line layout
25% - 75% Wall Thickness
10˚(soft materials) - 30˚(brittle materials)
110˚(brittle materials)-
140˚(soft materials)
FIGURE 33 - Tunnel gate
18 Gravi-Tech
Cooling Line Guidelines
The rules for cooling line layouts are to keep
the depth and pitch ratios constant throughout .
https://www.avient.com/news/polyone-makes-splash-cbme-karibu-folding-baby-bath
The material’s soft, grippy feel improves comfort and enjoyment for the child while enhancing safety.
https://www.avient.com/news/polyone-design-and-innovation-solutions-take-center-stage-chinaplas-2019
Smartbatch™ Frost Collection, when added to PET resins, can replace spray-on or painted frost effects to provide a soft, cool and icy look with texture for slip-resistance.
https://www.avient.com/resources/safety-data-sheets?page=784
83701610 BLACK SOFT TEXTURED
https://www.avient.com/resources/safety-data-sheets?page=1724
ALL SOFT GOLD PEARL PET V4
https://www.avient.com/resources/safety-data-sheets?page=3515
Geon(TM) DB4932 NEUTRAL SOFT FR
https://www.avient.com/resources/safety-data-sheets?page=5271
CN4A MED SOFT CERAMIC ADX5017
https://www.avient.com/resources/safety-data-sheets?page=6020
SOFT WHITE PVC 2
https://www.avient.com/resources/safety-data-sheets?page=4364
E6001-1385 SOFT WHITE