The pallets are formed by: - either of 2 stringers: (small palettes), - or of 3 stringers: (general case), - or more than 3 stringers palettes of very big size (from 1.5 to 2.5 m) or whose loads are very important).

chevrons
Pallet in 2 stringers

Pallet in 3 stringers

Pallet in 4 stringers

Stringers serve as strigerboard and support the top deck of the pallet.
The thread of the wood is always in the length of the stringer.
The location of stringers corresponds aside between the stringers of a pallet. The distance can be constant or no constant.


constant distance

constant distance

no constant distance
no constant distance

constant distance
constant distance
Cut stringer: a palette with cut stringers allows the passage of the forks of a transpalette as well in the sense of the length as in the sense of the width.


cut stringer
+ TECHNICAL ASPECT+

In the USA, most of the palettes are realized with cut stringers. The beam of standard curvature, which is 1 thumb (2,56 mm) tends to pass in 2 thumbs (5,32 mm), to avoid a weakness created by a notch almost in right angle.

notch almost in right side

Notch almost in right angle

notch with beam of curvature
Notch with beam of curvature


In Europe, to keep the biggest wooden section and thus the better resistance, the beam of curvature is much bigger (120 in 200 mm). To allow the passage of forks (thickness from 50 to 70 mm), the length of the notch should too be bigger. After all, there is little place for the support of the bottom deck or the pallet skid, what can pull a problem of supports surface in case of binding on 2 or 3 heights.
forks of the transpallet

Forks of the transpallet

Let be one use machines with a drill of a beam equal to the length of the notch (from 250 to 300 mm) which attack the chevron in the sense of its width. Two drills are necessary to realize both notches at the same moment. In that case, the distance crossed by the stringer is equal to its thickness, is from 30 to 70 mm. The machine can cut 4000 stringers at the hour. The beam of curvature can be equal to 0 to obtain a right angle. There are two manners to realize notches - Is one use a classic top attacking the stringer in the sense of the length. In that case, it is necessary to add to the beam of the drill the distance crossed by the stringer the time of penetration of the drill. The beam will thus be at least 120 mm, and at most 300 mm.

drill
stringer and drill
Stringer moving in the sense of its length



This process presents inconveniences: - forming of numerous shavings, - required to cross stringer by stringer in the sense of the length (slowness of the process).

Let be one use machines with a drill of a beam equal to the length of the notch (from 250 to 300 mm) which attack the chevron in the sense of its width. Two drills are necessary to realize both notches at the same moment. In that case, the distance crossed by the stringer is equal to its thickness, is from 30 to 70 mm. The machine can cut 4000 stringers at the hour. The beam of curvature can be equal to 0 to obtain a right angle.

drill