The green veneer fishtail veneers are separated from the other fractional veneers and are cut into pieces of usable size before being crowded together and stitched or sewn into the continuous web which is cut into green core sheets. The fractional veneers which are separated from the fishtail veneers are similarly crowded together along another processing line and are stitched or sewn into a continuous web which is clipped into green core sheets. The core sheets from both processing lines are stacked and later processed through a veneer dryer. Patent Nov. Application Ser.
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Veneer sheets, production volume (cu. meters) - for all countriesVIDEO ON THE TOPIC: How wood veneer is produced
The green veneer fishtail veneers are separated from the other fractional veneers and are cut into pieces of usable size before being crowded together and stitched or sewn into the continuous web which is cut into green core sheets. The fractional veneers which are separated from the fishtail veneers are similarly crowded together along another processing line and are stitched or sewn into a continuous web which is clipped into green core sheets.
The core sheets from both processing lines are stacked and later processed through a veneer dryer. Patent Nov. Application Ser. The disclosures of both applications are incorporated herein by reference. Background of the Invention The present invention relates generally to the manufacture of plywood panels, and more specifically to methods and apparatus for making plywood panel core sheets from pieces of green veneer. Wood veneer used in the manufacture of plywood originates in the form of relatively long strips which are typically peeled by a veneer lathe from a green" log.
As the veneer is peeled from the green log, the strips or ribbons of veneer thus produced are caught on belted storage decks or run-out tables from which they are transferred to a single deck conveyor and subsequently clipped transversely of their lengths into green sheets or veneers having dimensions slightly greater than the width and length of the finish plywood panels. Plywood panels are typically 8 feet long and 4 feet wide.
The veneers are typically 8 feet long plus 7 inches and 4 feet wide plus about 4 inches. The veneers having dimensions in the ranges indicated are hereinafter referred to as pre-panel size veneers. Defective areas in the veneer ribbons are removed by the clipping operation, and this results in many small pieces of green veneer which are less than pre-panel size.
These green veneers of less than pre-panel size are hereinafter referred to as fractional" and fishtail veneers. Fishtail veneers are fractional veneers which are not of uniform width throughout their length, but which have a full width part equal to at least half their length.
These fishtail veneers may be cut into salvage material and scrap. It has been the practice to dry the pre-panel size veneers and the fractional veneers in a veneer dryer and then to manufacture the panel using the full size veneers as the back and "face" layers and the fractional pieces as center, core and crossband materials intermediate the back and face layers. Since the plywood panels have at least the three layers of veneers and since the layers intermediate the backs and faces are seldom, if ever, full size veneers, it is apparent that the drying of veneers and their assembly into a plywood panel necessitates repeated handling of many narrow or short veneer pieces.
The handling of the veneers, including arranging them in close side-by-side relation when laying up" the panels, is time consuming and results in considerable breakage and other damage to the 2 veneers. The loading of the fractional veneers into dryers also has required considerable manual handling of the veneer pieces. Efforts have been made in the past to unitize the fractional veneers prior to assembling the plywood panels in order to alleviate the handling problems and to reduce breakage.
A typical example of the prior art practice is disclosed in Defensive Publication No. T,0l4, published Mar. According to that publication, the fractional veneers are brought into edge-to-edge contact and are united by tapes adhesively bonded to the surfaces of the veneer sections.
The resulting multisection thin veneer core sheet is then cut into pieces of the desired size. Another proposal for unitizing pieces of veneer is disclosed in U.
The procedure disclosed in this patent involved an attempt to stitch or sew dry veneer pieces together to form a strip which then could be cut into lengths of the desired size. Summary of the Invention An object of the present invention is to provide new and improved methods and apparatus for making plywood panel core sheets from unitized pieces of green veneer.
Another object of the present invention is to provide new and improved methods and apparatus for processing pieces of green veneer characterized in that the pieces of green veneer are sewn together with thread and made into plywood panel core sheets for better handling during further operations, such as drying, grading, laying-up plywood panels, etc. A more specific object of the present invention is to provide methods and apparatus for making plywood panel core sheets by a new and improved procedure involving stitching with thread fractional green veneers to form continuous green veneer webs, clipping or cutting the webs into sheets of pre-panel size, and processing the sheets of green veneer through a veneer dryer.
According to the provisions of the present invention, fractional green veneers normally used as center, core and cross-band material in the plywood panels being manufactured are arranged in close side-by-side relation and are united together to form a single green veneer sheet or web. The green fractional veneers are united by stitching them together with fiber cord or thread material. Green fishtail veneers are separately processed by trimming to form usable salvage material.
These salvage pieces are also stitched together to form a single green veneer sheet or web. The green veneer webs are clipped or cut into pre-panel size sheets and are then processed through a veneer dryer. The procedure of unitizing the pieces of green veneer makes it possible to mechanize and reduce the cost of various plant operations such as veneer drying, dry grading, and the process of laying-up the plywood panels.
Additional objects and advantages and a fuller understanding of the invention will be had from the following detailed description of a preferred embodiment of the invention and the accompanying drawing.
Brief Description of the Drawing The drawing is a fragmentary plan view of a plywood mill showing one embodiment of the invention.
Description of the Preferred Embodiment Referring to the apparatus illustrated in the drawing, reference character designates the downstream portion of a conveyer, typically referred to as the green chain, from which the full pre-panel size green veneers have been removed. Some of the green fishtails 12 on the conveyer 10 may be manually transferred to a transverse conveyer 14 by an operator at a station designated 16 and the remainder allowed to continue along the green chain with the fractional size green veneers 18, as desired.
Adjacent the downstream end of the green chain 10, the green fractionals 18 are transferred to a transverse conveyer 20 by an operator stationed at or adjacent the operators position The scrap veneer on the green chain is either allowed to fall into a transverse scrap veneer conveyer 24 at the end of the green chain or is transferred thereto by an operator at or adjacent the operator's station The green fishtails 12 continue along a conveyer 26 in a second veneer processing conveyer line to a fishtail saw table 30 where the fishtails are sawed into usable lengths by fishtail saws 32, 34 which are normally positioned approximately 4 feet plus 2 to 4 inches from one another.
The scrap veneer is allowed to fall off the fishtail saw table into a transverse scrap conveyer 40 and the usable green veneers continue along another conveyer 42 to a crowder" 44 where they are moved into edge-to-edge position.
The crowder 44 feeds the green veneers to a stitcher" 46 where they are stitched, as by stitching 47, into a continuous green veneer sheet or ribbon 50, the width of which is slightly over 4 feet. The continuous green veneer sheet or ribbon 50 continues toward the right, as viewed in the drawing, on a conveyer 52 to the clipper 54 where it is cut into green veneer sheets 56 the lengths of which are slightly greater than 4 feet, for example, 4 feet 6 inches, to produce what is referenced to in the art as 8 X 4 inches sheets.
The green veneer prepanel size 8 X 4 inches sheets thus produced are carried by a conveyer 60 to a vacuum stacker 62 which preferably stacks them into a stack 64 at one side of the conveyer, which in the embodiment shown is the near side. The stacks 64 thus produced can be transferred by suitable equipment to the dryer for further processing.
The fractional green veneers 18 are carried by the conveyer 20 to a conveyer 70 of a third veneer processing conveyer line which in the embodiment shown is parallel to the second veneer processing conveyer line.
A back stop 72 at the side of the conveyer 70 opposite from the conveyer 20 assists in aligning the fractional green veneers on the conveyer As the green veneers 18 are carried along the conveyer 70, their ends are further align ed by an operator at or adjacent the operators position, designated 74, by being pushed against a second back stop 76 at the side of the conveyer opposite from the operator.
The conveyer 70 carries the aligned green fractional veneers 18 onto a crowder 80 which crowds the green fractional veneers, that is, moves them into side-by-side position and feeds them to a stitcher The stitcher 82 stitches them, as by stitches 83, in a continuous green veneer sheet or ribbon 84 and discharges it onto a conveyer 86 which carries it to a clipper 88 where the green veneer continuous sheet 84 is cut into green veneer sheets 90 having a length slightly greater than 4 feet to produce so-called 4 X 8 sheets.
Such green veneer sheets of pre-panel size are then carried on a coninto a stack 96 at the end of the conveyer In this event two green veneer sheets of pre-panel size arrive simultaneously at the stacker 94 and the stacker 94 is then operated to deposit the sheets , at opposite sides thereof into stacks ,, respectively. Whether or not green fishtails 12 are diverted from the green chain 10 to the transverse conveyer 14 will normally depend upon whether or not the tishtails on the green chain 10 at any given time exceeds the capacity of the apparatus downstream from the conveyer 20 to handle them.
If the capacity of this equipment is exceeded, the excess or if for other reasons green fishtails are diverted to the transverse conveyer 14 they are fed thereby to a conveyer parallel with the conveyer The conveyer carries the green fishtails l2 thereon to a fishtail saw table similar to the fishtail saw table 30 where they are cut into usable green pieces and fed to a vacuum stacker where they are formed into a suitable stack The scrap veneer is carried away from the fishtail saw by a scrap conveyer The stack can be subsequently transferred to the infeed end of conveyer 70 as by a conveyer extending transversely of the infeed end of the conveyer When the conveyer 70 is not being employed to process green fractional veneers 18, the green salvage material can be fed thereto in double side-by-side rows and subsequently stitched into two green continuous sheets slightly more than 4 feet wide, which in turn are cut into green 8 X 4 sheets and stacked by the vacuum stacker 94 into stacks similar to the stacks ,, previously referred to.
The equipment herein illustrated and described may be considered as two transversely spaced parallel conveyer or veneer processing lines connected by a transverse conveyer through or along which the green fractional veneers move continuously and are continuously processed. Suitable individually equipment units, such as the various conveyers, fishtail saw tables, crowders, stitchers, vacu'um stackers, etc.
These green veneers can be readily stitched by available sewing or stitching machines modified for this purpose. A plurality of rows of stitches are preferred and are normally produced simultaneously. To this end, the stitcher units each have a plurality of stitching heads, preferably 6, arranged transversely of the path traveled by the veneers being stitched, which heads may be of chain-stitch or the lock-stitch type utilizing pre-punched holes for the stitching needles, as desired.
Such a head is shown in United States Pat. The novelty of the present invention is in the particular arrangement of the various equipment units shown and described. While the preferred embodiment of the invention has been described in some detail, certain changes may be made in the arrangement layout shown without departing from the invention as will be understood by those skilled in the art to which the invention belongs, for example, the location of a continuous dryer between either of the stitchers shown and the clipper downstream therefrom.
Fields It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:. RUTH C. An apparatus and method for making plywood panel core sheets from pieces of green veneer characterized by the procedure of: 1 crowding the pieces of green veneer into close side-by-side relationship on a moving conveyer; 2 stitching or sewing with thread the crowded pieces of green veneer to form a continuous green veneer web; 3 clipping or cutting the continuous web into sheets larger than the plywood panels being manufactured in order to allow for shrinkage when the green veneer sheets are subsequently processed through a dryer; and 4 processing the oversize sheets of green veneer through a veneer dryer.
In a preferred embodiment of the invention, green fractional and green fishtail veneers are delivered from a veneer clipper to a conveyer for subsequent processing. Fields, Portland, Oreg. Application Data  Continuation of Ser. What is claimed is: 1. Fields It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below: Col.
USA true US USA en Apparatus and method for handling and processing green wood veneer in the manufacture of plywood. USA en. DEA1 en. JPB2 en. USB1 en. USB2 en. GBA en. EPB1 en. Wood piled with split and disrupted pieces and its manufacturing method and manufacturing apparatus. CAA1 en. WOA1 en. JPA en. The method and machine for pulling the panel saw with movable pusher laterally.
Account Options Sign in. Janice Kathryn Wiedenbeck. This publication provides a broad spectrum of information on the hardwood veneer industry in North America. Veneer manufacturers and their customers impose guidelines in specifying wood quality attributes that are very discriminating but poorly defined e. To better understand and begin to define the most important attributes that distinguish veneer logs from sawlogs, and high-end from low-end veneer logs, we visited and interviewed veneer log buyers and sellers, veneer manufacturers, and veneer sales personnel. The first section of this report provides information on the demographics of the hardwood veneer industry and domestic and export market influences on veneer manufacturing.
US3447579A - Reverse pass in-line veneer production system - Google Patents
Descriptions of manufacturing processes 1. This analysis had to identify the amount, type and quality of energy required so as to identify possible energy savings compatible to the respective cost-benefit analysis. The following process descriptions of the manufacture of sawn timber, plywood and particleboard are of a general nature and should provide the reader with a broad outline of the production processes involved in the mechanical wood-based industry and the role in which energy plays a part. Sawmilling is a less sophisticated activity of the mechanical forest industries.
Manufacturing Process of Veneer and Plywood
Since clever Egyptian's "invented" the process thousands of years ago, numerous refinements to veneer-manufacturing have evolved. The most basic method of veneer production involves turning a log on a lathe while a long knife blade peels off a continuous sheet of veneer; however many other methods and variations of methods are available, each of which create uniquely different end-results. The following is a brief discussion about some of the basic techniques commonly used in veneer production; however for your specific needs please contact the talented and friendly sales department at ELDCAN FOREST PRODUCTS, who are waiting to help you match your specific needs with the production methods best designed to achieve the product you are looking for. Sliced Veneers — are produced by thrusting a log or sawed flitch into a slicing machine, which then shears off the veneer in sheets. Accounting for a very small portion of veneer production, this method is mainly used to produce radially orientated, fine figured, hardwood veneers for furniture or wall-panel facing.SEE VIDEO BY TOPIC: Production of Laminated Veneer Lumber STEICO LVL
Low density wood such as Pulai Alstonia sp. Converting these timbers into Laminated Veneer Lumber LVL and reinforcing them with stronger timber could turn them into much sought after materials. This study discusses the effects of incorporating Keruing veneers into LVL panels made from low density wood. Laminated Veneer Lumber comprised ply and ply veneers fabricated by arranging Keruing veneers located at the surface and the low density woods were arranged as core. Phenol Formaldehyde PF resin was used as the binder. The bending properties and percent delamination were determined according to the Japanese Agricultural Standard JAS for Structural LVL: before and after the cyclic boil dry treatment. Result showed through incorporating low density wood with Keruing veneers, both ply and ply LVL panels achieved the minimum requirements for various grades stipulated in the JAS for Structural LVL Standard: Presence of Keruing veneers as surface layers significantly increased the strength of the LVL panels.
Veneer is produced in varied sizes and thicknesses from 0. The conventional thickness is 0. For this peeling technique the log is cut into thirds or quartered. The block is clamped in the lathe with the heart side facing the blade and is peeled outwards from the inside from the heart.
Home Topics Geography and Agriculture Veneer sheets, production volume. Veneer sheets, production volume cu. Overview Overview The series "Veneer sheets" contains 26, data rows in 5 data sets for countries. Definition Definition Plywood, veneer plywood, core plywood including veneered wood, blockboard, laminboard and battenboard. Other plywood such as cellular board and composite plywood. Veneer plywood is plywood manufactured by bonding together more than two veneer sheets. The grain of alternate veneer sheets is crossed generally at right angles. Core plywood is plywood whose core i.
Manufacturing Process of Wood Veneer
It provides solutions to all problems pertaining to houses right from concept to completion. The manufacturing of wood veneer includes all the processes from the time when the tree log enters the yard to the time when veneer sheets are packed and ready to be transported. The image below explains the entire manufacturing process of wood veneer in a simplified manner. As soon as the tree log arrives from the forest, they are classified by species and kept under conditions of optimal humidity by spraying water or by soaking in water ponds. This is done to prevent the tree log from degrading which usually occurs as a result of drying. The next step is debarking. Taking great care not to damage the tree log the bark is peeled off with evenness. The next step involves soaking the log to soften the fiber. It is necessary for uniform slicing. For maximum efficiency, the tree log should be cut within an hour after soaking.
Manufacturing Process of Veneer and Plywood
Veneer is a thin slice of wood made by rotary cutting or slicing of the log. The appearance of veneer varies and it depends on how the log is cut. Moist, warm and debarked logs are rotary cut into thin layers called veneers after careful measuring and cutting of the logs. Long but thin slices of wood appear. Wood changes dimensions when it dries or absorbs water.
Purdue University Press Bolero Ozon. Ang Schramm.
This is a Continuation-in-Part application of copending U. The present invention relates to a process for the production of veneer and more particularly to a process for producing sheets of wide veneer to be applied to plywood and sheets of wide, thin veneer for producing fancy board veneer-overlaid board in one operational step. In conventional processes for producing sliced wood veneer to be glued on a substrate or to be used for plywood, a log is longitudinally and transversely sawn into various-sized small flitches and they are subsequently sliced individually by means of a slicer or a rotary lathe into sheets of thin veneer.
Patent No. Erickson to permit application of the in-line system to plants of lesser capacity, resulting in more efiicient use of manpower and machinery. A method for increasing the efliciency of the dryer disclosed in the instant application is disclosed in U. Patent application Ser.
Он мысленно прорепетировал предстоящее убийство. Если у входа на площадку взять вправо, можно увидеть самый дальний левый угол площадки, даже еще не выйдя на. Если Беккер окажется там, Халохот сразу же выстрелит. Если нет, он войдет и будет двигаться на восток, держа в поле зрения правый угол, единственное место, где мог находиться Беккер.