“Kaduysky Plywood Plant” systematically buys birch veneer logs.
Requirements for raw materials:
Type: birch
Peeler block length: 1.6 m + 5 cm allowance. – 1.65 m., multiple of: 3.30 m., 4.95 m.
Peeler block diameter: 18-54 cm., (the maximum size of the butt)
| Flaws in wood according to GOST 2140-81 | Standards of limits of flaws in wood by grades | |
| 1 grade | 2 grade | |
| Twigs and stubs: | ||
| – all kinds, except for tobacco knots; | Allowed size no more than 3 cm. | Allowed size no more than 7 cm. |
| – tobacco knots; | Not allowed | Allowed size
no more than 4 cm |
| Fungal disease | ||
| – pathological heartwood (healthy) | middle timber 18-24 cm – 1/10 diameter large timber 26 cm and more – 1/4 diameter, but no more than 10 cm (peeling zone – no less than 5 cm) | middle timber 18-24 cm – 1/4 diameter large timber 26 cm and more – 1/3 diameter, but no more than 10 cm (peeling zone – no less than 4 cm) |
| – brown discoloration | Not allowed | Allowed without white spots |
| – sapwood rot | Not allowed | Not allowed |
| – external rotten decay | Not allowed | Not allowed |
| – hollows, pathological heartwood rot | Not allowed | Not allowed |
| Wormholes | Not allowed | Allowed outside the peeling zone |
| Cracks | ||
| – all kinds, including butt cracks from drying-up (except side cracks) | Allowed: inside the butt end circle or stripe, not bigger than 1/3 diameter of the relevant butt end, not deeper than the established allowance | Allowed: inside the butt end circle or stripe, not bigger than 1/2 diameter of the relevant butt end, not deeper than the established allowance |
| – side cracks from drying-up | Not allowed | Not allowed |
| Curvature | ||
| – simple
|
Allowed, with a ratio of the maximum deflection at the place of the largest curvature to the length of the peeler log in %, no more than: timber up to 24 cm thick – 1% (maximum deflection length – 16 mm), timber ³ 26 cm thick – 2% (maximum deflection length – 32 mm) | Allowed, with a ratio of the maximum deflection at the place of the largest curvature to the length of the peeler log in %, no more than: timber up to 18 cm thick – 1% (maximum deflection length – 16 mm),
timber 20 – 24 cm thick – 2% (maximum deflection length – 32 mm), timber up to 26 cm and over – 3% (maximum deflection length – 48 mm) |
| – complex | Allowed, ½ of standard simple curvature | Allowed, ½ of standard simple curvature |
| Mechanical damage | ||
| (marks, gashes, spalls, slivers, tear-outs), as well as open and closed bark pockets, dry sides and canker | Allowed outside the peeling zone
The peeling zone should be not less than 5 cm |
Allowed outside the peeling zone
The peeling zone should be not less than 4 cm |
| Bark flanking | Allowed, no more than 15% of the total area of the assortment surface | Allowed, no more than 15% of the total area of the assortment surface |
| Stump pulls | Not allowed | Not allowed |
Delivery: by motor transport (Vologda Region, Kaduysky District, village Kaduy, 4 Zapadnaya Street).
Acceptance is carried out twenty four hours a day.
