What is Packing plywood Standard ?
1. Specifications and dimensions mr grade plywood
Specifications and dimensions of plywood for packing boxes shall be as specified in Table 1.
Table 1 Specifications and dimensions of plywood for packing boxes are in millimeters
Width | Length | Thickness |
915,1220 mm | 915,1220,1830,2135,2440 mm | 5,6,8,9,12,15,18,22 mm |
Note: Special dimensions are agreed by the supplier and the demander 19mm plywood 8×4 price. | ||
2. Dimensional tolerance used plywood for sale
2.1 The size tolerance of length and width is ±2.0mm, and the special requirements are agreed by the supplier and the buyer cutting plywood.
2.2 Thickness tolerance shall comply with table 2.
Table 2 Thickness tolerance unit of 4×8 plywood lowes for packing box is millimeter
nominal thickness （t） | Unearthed plate | Sanding board (single side) | ||
Thickness tolerance in each plate | Tolerance of thickness | Thickness tolerance in each plate | Tolerance of thickness | |
5≤t＜9
| Zero point seven
| ﹢0.5 ﹣0.3 | Zero point five
| ±0.3
|
9≤t≤12 | One | ﹢（ 0.6+0.03t） ﹣（ 0.3+0.03t） | Zero point six | ﹢（ 0.2+0.03t） ﹣（ 0.3+0.03t） |
t＞12 | One point five | |||
Note: There are special requirements agreed by the supplier and the demander. | ||||
2.3 The length difference between two diagonal lines of sparad plywood for packing boxes shall not exceed 1mm/m.
2.4 The right angle tolerance of douglas fir plywood edges for packing boxes shall not exceed 1mm/m.
2.5 The warpage of saburi plywood for packing boxes shall comply with the provisions in Table 3.
Table 3 The warpage of plywood for 2×4 packing boxes is required in millimeters
Nominal thickness (t)/mm | Warpage/% |
t＜9 | ≤1.0 |
T≥9 | ≤0.5 |
3. Appearance requirements as plywood companies
3.1 marine plywood 6mm for packing boxes is divided into superior products, first-class products and qualified products according to the appearance quality of panels
See Table 4 for the quality requirements of 1 inch plywood price of three grades.
Table 4 Appearance quality requirements of plywood for outdoor uses
Measuring items | Panel | Backplane | |||||
high-class products | First Grade | quality part | |||||
(1) needle joint | — | Allow | |||||
（2）
| movable joint | — | Allow | ||||
Semi-articulation
| Maximum single length /mm | Fifteen | Thirty | Unlimited
| |||
Number of boards per square meter | 2 (from below 5mm) | 4 (from below 10mm) | |||||
dead knot encased knot
| Not falling off | Allow | |||||
Fall off | Treat as “holes” | ||||||
(3) Decay | — | Not allowed
| It is allowed to have the symbol of initial corrosion without affecting the strength, but the area does not exceed 1% of the board area | ||||
(4) Abnormal structure of wood | — | Allow | |||||
(5) discoloration | No more than board area/% | Not allowed | Light color 10 | Unlimited | |||
(6) Sandwich | — | Not allowed | |||||
(7) Glue penetration and glue infiltration | No more than board area/% | Not allowed | one | Two | five | ||
(8) surface pollution | No more than board area/% | Not allowed | one | Two | five | ||
(9) glue opening at corners | — | Not allowed | |||||
(10) mildew | — | Not allowed | Slight | ||||
(11) bubbling and layering of spruce plywood | — | Not allowed | — | ||||
(12) sag, indentation, swell | Maximum single area/mm | Not allowed | Five hundred | One thousand | Two thousand | ||
Number of boards per square meter | one | Two | three | ||||
(13) surface plate lamination
| Maximum single width /mm | Two | three | four | six | ||
The maximum single length is the board length/% | Ten | Fifteen | Twenty | Thirty | |||
(14) core plate stacking
| Close to the watch board Core plate stack of leave
| Maximum single width /mm | Two
| three | four | six | |
Number of inner strips per meter of board width | one | Two | three | four | |||
The maximum width of the other layers from the seam /mm | Two | four | Ten | — | |||
(15) long and medium plates are folded away
| Maximum single width /mm | Two | three | five | — | ||
Number of inner strips per meter of board width | one | Two | three | ||||
Measuring items
| Panel | Backplane
| |||||
high-class products | First Grade | quality part | |||||
(16) Sand penetration of surface plate | On the board surface per square meter/mm | Not allowed | Nine hundred | Unlimited | |||
(17) Burr and groove mark | No more than board area/mm | Not allowed | five | Thirty | Unlimited | ||
Maximum depth /mm |
| Zero point five | Penetration is not allowed | ||||
(18) wormholes, nail holes, Hole
| Maximum single major diameter /mm | Not allowed
| Two | eight | Fifteen | ||
Number of boards per square meter | four | 10 (from 3mm Excluding the following)
| Not mesh-shaped Unlimited | ||||
(19) patches and strips
| Allow proper fabrication and firm filling, the number on the board per square meter | Two | four | six | Unlimited | ||
The accumulated area shall not exceed the board area/% | one | Two | five | Fifteen | |||
Maximum single major diameter /mm | Two hundred | Three hundred | Three hundred and fifty | four hundred | |||
Gap shall not exceed/mm. | One | One | One point five | One point five | |||
(20) edge defect | Self-nominal width shall not exceed /mm | Not allowed | Ten | ||||
(21) other defects | — | Not allowed | Considering the most similar defects | ||||
3.2 crack width merino plywood
3.2.1 Panel harga plywood 12mm
Cheap plywood 4×8 crack width is less than 0.5mm, excluding ;The crack width is not more than 2.0mm, and the putty is sanded after repair; The width of crack is greater than 2.0mm, and the veneer strips are repaired.
3.2.2 Backplane pre laminated plywood
Plywood workbench crack width is less than 0.5mm, excluding; The crack width is not more than 5.0mm, and the putty is sanded after repair; The width of crack is greater than 5.0mm, and the veneer strips are repaired. Request a Quote
4. Physical and chemical properties non structural plywood
Physical and chemical properties of plywood home depot canada shall comply with Table 5.
Projects | Thickness range /mm
| ||||
5≤t＜9 | 9≤t≤12 | 12＜t≤18 | t＞18 | ||
Moisture content | 6~14 | ||||
Glue strength /MPa | ≥0.70 | ||||
Static bending strength | Longitudinal /MPa | ≥34 | ≥30 | ≥26 | ≥24 |
Transverse direction /MPa | ≥20 | ≥20 | ≥20 | ≥20 | |
Elastic modulus | Longitudinal /MPa | ≥5.00×103 | ≥5.00×103 | ≥4.50×103 | ≥4.50×103 |
Transverse direction /MPa | ≥3.00×103 | ≥3.00×103 | ≥3.50×103 | ≥3.50×103 | |
Formaldehyde emission | E0 | ≤0.5 | |||
E1 | ≤1.5 | ||||
E2 | ≤5.0 | ||||
5. All layers of veneer of smooth plywood are not allowed to be terminated without bevel lap or finger splicing.
6. The content of soluble lead, cadmium, chromium and mercury in laser cut plywood for packaging boxes shall meet the requirements in Table 6
Table 6 The required limit of soluble lead, cadmium, chromium and mercury in custom cut plywood is mg/kg
Projects | Limited value |
Soluble lead | ≤90 |
Soluble cadmium | ≤75 |
Soluble chromium | ≤60 |
Soluble mercury | ≤60 |