Technological process of production the Plywood with faces in hardwood veneer for general use, WBP glued, according to GOST 3916.1-96, includes following stages:
1. Preparing logs for rotary peeling
We choose exceptionally the best wood suppliers for the plywood production.
Veneer is manufactured from the birch block logs (State standards GOST 9462-88)
The automatically maintained schedule of soft hydrothermal handling of the raw materials in ponds enables to reduce internal tension of timber and number of splits.
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2. Debarking
The process of debarking logs includes the moving barks and bast off logs.
After debarking, logs go through the scanner to determine the cubic capacity.
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3. Cross cutting
A log shortening in blocks is extended on saw log machines in semi-automatic regime. On this stage we set the width of veneer.
The wastes fall into the section of the waste treatment.
The blocks get into the accumulator and after that to peeling machine.
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4. Peeling, cutting and veneer placing
The veneer peeling is made on peeling lines. The veneer cutting into size is processed at peelers.It involves centering the log or bolt onto the lathe chuck.
The log is slowly rotated and the knife carriage is moved into the log. The knife then converts the bolt into a cylinder.In this process of rounding, we get required widths and lengths of wood are removed from the log surface.
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5. Drying
Veneer drying takes place in roller dryers, which operate on furnace gases.
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6. Veneer grading
6.1 One part of the dried veneer goes to the jointing and patching zone, another to grading immediately.
6.2 Veneer is graded after scarf jointing and patching.
6.3 Veneer grading is conducted according to the following requirements:
- state standards GOST 99-96 (Rotary-cut veneer. Technical requirements)
- state standards GOST 3916.1-9 (Plywood with faces in hardwood veneer for general use.)
- individual customer requirements
6.4 Unsorted and piece veneer after cutting is fed to long grain scarf jointing for the inner plies, and the veneer cut across goes to the composing
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7. Composing
The composed cross grain veneer is used for the inner plies of big-size plywood.
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8. Scarf jointing
The scarf jointing is made on the machines with long and cross grain veneer feed.
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9. Patching
For patching the pieces of veneer with the average weight of 49 m2 are used. The insertions are selected according to the grain direction and color of wood as well as panels meant for patching of the same species and thickness that are densely held in veneer.
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10. Glue preparation and putting
For gluing WBP plywood phenol-formaldehyde glue is used, the recipe of which is the know-how our production.
The glue putting is executed on the roll glue spreaders by the channeled metal drums of the cylindrical shape.
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11. Panel Assembling and Pre-pressing
After glue putting veneer is formed into panels assembling which go to pre-pressing. The pre-pressing process runs according to the fixed regime before loading panels to hot-press.
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12. Hot pressing
The mill has a steam heated hot press, which is equipped with the electronic press management system, mechanical loading and unloading.
After hot-pressing the plywood stacks are kept in the workshop for 24 hours to withdraw the inner panel tension.
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13. Trimming and sanding
Trimming of panels is executed on the sizing machine.
Then panels are fed to sanding machine tool, which applies a wide belt sander with the top and bottom head.
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14. Sorting, packing, packaging
After trimming and sanding all plywood is manually graded according to the state standards GOST 3916.1-96 or individual customer requirements.
Plywood is shipped in bundles containing panels of uniform grade, size and thickness. They are firmly protected from damage during transportation. Each bundle is packed from 4 sides into plywood packages that are tied up by metal belt. Standard packing may be changed in accordance with the contract conditions.
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