CN101284384A

CN101284384A - High-density polyethylene glued board producing method

Info

Publication number: CN101284384A
Application number: CNA2007101007224A
Authority: CN
Inventors: 林群祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-13
Filing date: 2007-04-13
Publication date: 2008-10-15

Abstract

A method for manufacturing a HDPE wood plywood mainly includes: rolling dense pin holes on the cementing surface of a veneer; replacing urea formaldehyde, phenolic aldehyde and other adhesives with HDPE plastic film; laying up in the common conventional plywood lay-up method and only laying the HDPE film instead of the adhesives; heating and pressuring the lay-up on a hot press machine and then pressuring and cooling on a cold press machine. The problems that the HDPE is immiscible with the wood, and can not be taken for the adhesive of the wood are solved by applying the principle of mechanical locking; The heat loss and the time consumption of the hot press machine can be avoided when the lay-up is cooled, for pressing is carried out on the hot press machine and the cold press machine respectively. The plywood product has formaldehyde-pollution-free production, high strength, durability, weather resistance, acid and alkali resistance, high water resistance, good appearance and low price. The manufacturing process has no pollution, and is environment-friendly, energy-saving, efficient and simple.

Description

High-density polyethylene glued board producing method

Technical field

The present invention relates to a kind of method of producing wood plywood.

Background technology

Be usually used in interior decoration at present, the glued board (three-ply board, multi-layer sheet, core-board, compoiste wood floor etc.) and the adhesive of building slab that furniture is made are urea aldehyde and phenolic resins, have formaldehyde and discharge problem (outdoor architecture is except plate), and formaldehyde discharges even more serious in the production process, these have endangered consumers and producers's health, and this has become the hot issue that the people of the whole society pay close attention to; The isocyanate adhesive glued board, formaldehydeless release, toxic thing polluted during palette was produced; The acid of building template double-fermented wine, alkali, water-based neither be fine; Application number is that 2004100116451 " being furnished with the glued board of pin hole on the wood chip " patent application discloses a kind of formaldehydeless glued board that pollutes that waits of making adhesive with polyvinyl chloride (hereinafter to be referred as PVC), but the compacting process in this plywood production is still continued to use at present way usually, slab hot pressing, cooling shaping is finished on same press, and press temperature is also higher.Usually the plywood production thermal source adopts boiler more, and heating cost is very big.

Summary of the invention

Task of the present invention provides a kind of adhesive such as urea aldehyde, phenolic aldehyde that replace with high density polyethylene (HDPE) (hereinafter to be referred as HDPE) film, do not have toxic thing such as formaldehyde, solvent to pollute, acid and alkali-resistance, water-based can be strong, presentation quality is good, firm, reliable, inexpensive, nontoxic, odorless in producing, energy-saving and environmental protection, glued board producing method efficiently.

Task of the present invention is finished as follows: the present invention handles the veneer that is used to produce glued board earlier, rolling intensive pin hole on the veneer cemented surface, replace adhesive such as urea aldehyde, phenolic aldehyde with the HDPE film, veneer after rolling pin hole is handled and film are substantially by general glued board assembly method assembly, shop HDPE film replaces adhesive between the adjacent veneer, be placed on heating on the multi-daylight press, pressurization after slab is formed, move on to pressurization on the cold press that another is onesize, the number of plies is identical, cooling after the slab hot pressing again.

Do not have rolling pin hole on the common plywood single board, can only continue to use the adhesive gummed good such as urea aldehyde, phenolic aldehyde, have pollution problems such as formaldehyde release with the collose viscous force; The alkaline-resisting water-based of phenolic aldehyde cement formwork is also not so good, meeting layering in the use, and access times are few; The carbimide glued board does not have formaldehyde to discharge, and toxic gas polluted during palette was produced, and glue very expensive (valency be urea-formaldehyde glue 4-5 doubly) to yet there are no this glued board commercially available; HDPE is nontoxic, odorless, be that the main material of packaging for foodstuff has excellent environment-protective, chemical stability, physical mechanics property and is convenient to processing characteristics, but with wooden immiscible, usually can not be as its adhesive, the present invention rolls on veneer pin hole, the pressurized pin hole that enters after the HDPE film heat fused, the pin hole wall is because the characteristics of wooden structures, not smooth, and pin hole is an elongate, after HDPE fills full pin hole and solidifies, closely cooperate with pin hole, locking reaches very strong mechanical interlocked effect mutually.The huge many pin holes of quantity are arranged on the adjacent veneer cemented surface, by heating, pressurization, cooling, the fusing of HDPE film enters the pin hole on the veneer of both sides, solidify, this has formed the huge many mechanical interlocked minor structures of quantity, veneer is combined firmly, (also can be considered as by quantity huge many and woodenly become the little nail of plastics of interlocking to be nailed together) and become glued board, and reach extraordinary bonding strength.

Must be pointed out that gummed of the present invention is not the gummed by the molecular characterization generation on the ordinary meaning, but the combination of physical mechanical, but for sake of convenience, so use gummed one speech.

Glue together glued board with HDPE, performance such as the physical chemistry that HDPE is good and fabulous cost performance have determined also do not have plate intensity height except there being Toxics such as formaldehyde to pollute with log is same clean with the glued board of its production, strong, durable, the anti-marquis of acid and alkali-resistance water-based, plurality of advantages such as inexpensive.During the rolling pin hole of veneer since pin very sharp, can not block destruction to the veneer fiber, can not reduce plate intensity.

Common glued board drawing method in 2004100116451 patent applications is used for its PVC plywood production, because PVC is a thermoplastic, be characterized under the cooling situation, just solidifying, and then have intensity, so gluing together slab, can only under the cooling situation, in press, take out PVC, in order to avoid veneer unclamps, glue-line destroys, lose intensity, thus after finishing, hot pressing to cool off press iron pressing plate, and then reach the cooling of plank base.Because of iron pressing plate quality is tens times of plank base quality, have a large amount of heats in the hot pressing, to its cooling, a large amount of heat forfeitures, and a large amount of water are after slab cooling back is taken out and finished a pressing cycle, for next pressing cycle heating, need a large amount of heats so again, for a long time again.HDPE and PVC are thermoplastic equally, after need cooling off equally, could from press, take out HDPE gummed slab, the present invention uses hot press and cold press respectively, hot press does not cool off, slab moved on to the cold press cooling of pressurizeing rapidly rapidly after hot pressing was finished, (the slab of compacting does not enter hot press hot pressing again simultaneously), heat on the just plank base that cools away like this, very limited, be 1/tens on the hot press iron pressing plate, and save a lot of cooling waters, cool time and heat time heating time again, HDPE glued board drawing method of the present invention is saved heat energy more than 90% than the PVC glued board drawing method in 2004100116451 patent applications, raises the efficiency (heat of the present invention more than three times, cold each press output can be supported 2004100116451 5-6 platform press output at least) and saved a large amount of waters.

The present invention's HDPE film, the HDPE fusion temperature is lower than PVC tens degree, so hot pressing temperature also can be hanged down tens degree, this has saved the energy again, reduced requirement to working condition, and the plank base saves and cool off required time in hot press, and hot pressing temperature reduces and the heated time minimizing can make the slab products nondiscolouring, not become fragile.HDPE proportion is less than 1, PVC proportion is greater than 1.4, with thermoplastic plastic membrane's production plywood applications is the physical mechanical principle, consider the volume of the film that uses, so single putting on the volume cost say at this point, with the HDPE cost with compare with PVC and very big difference arranged, this part can differ 30-40%, also significantly reduce cost such as these, improved quality.

The specific embodiment

Produce 1.22m * 2.44m sheet material (as: three-ply board, multi-layer sheet, core-board, compoiste wood floor material construction structural template etc.) with two conventional multidaylight presses, one is hot press (heater is arranged), a laterally parallel and close as far as possible installation for two machines of cold press (cooling device is arranged), (install long limit is close on two captain limits, help slab and move on to cold press by hot press fast), and cold press should be installed low.Use conventional veneer, the central layer of core-board wants elder generation to stick into piece with the adhesive glue of formaldehydeless release, the veneer cemented surface is with the rolling pin hole of porcupine roller machine, the porcupine roller machine is the roller machine that is covered with draw point on the roller, roller can be made with plastics or the metal that is easy to process (as aluminium etc.), the pin hole specification that pressing veneer on the roller needs is bored aperture, and (about adjacent holes centre distance 2mm), be fixed in the above draw point (glue of available sufficient intensity is fixed).Needle point does not expose too much, and 2-3mm gets final product, in order to avoid easy to break; Also available needle plate rolls the hole, and needle plate is copied iron nail plate way, can distance boring back be fixed in the above draw point on request with plastic plate.The rolling pin hole of veneer, last aperture 0.3-0.4mm, the about 1.8-2mm of hole center distance (every sq has 25-30 pin hole on the veneer cemented surface) hole depth 0.4-1mm, rolling that veneer is thick is dark, thin rolling is more shallow, the hole is nearly bellmouth, specification, distance can be according to the pin tapering, and sheet material matter, thickness etc. are suitably adjusted, grasped flexibly, and it is dead not limit by above-mentioned numeral.Assembly, veneer is put folded assembly substantially according to a conventional method in proper order, shop HDPE film between the veneer, about thickness 0.13mm, (look the veneer aperture size, depth density etc. can suitably be adjusted) puts into hot press hot pressing behind the assembly, hot press iron platen temperature is about 158 ℃, hot pressing time calculates with being more or less the same usually, and every 1mm thickness of slab is about more than 1 minute, and principle is that HDPE fully melts, hot pressing is earlier with little pressure heating, be that the little pressure of elder generation compresses veneer before the film fusing, in order to fine heat transfer, but unsuitable pressure is too big, in order to avoid damage pin hole, arrive heat time heating time, and after the HDPE film fully melted, intensified pressure was to about 10 kg/cm again, the slab compacting, HDPE is filled with pin hole.After hot pressing is finished, open hot press (cold press is leaving) and slab is moved on to cold press rapidly cold pressing, the pressing plate base does not promptly enter hot press hot pressing simultaneously, colding pressing pressure should big slightly hot pressing pressure, about about 11 kg/cm, and pressure will maintain, and pressure can not be decayed before cooling was finished.The laggard water cooling that works of colding pressing when being cooled to 65 ℃ of left and right sides of plate central temperature, being opened cold press pressing plate slab and is taken out.Board briquette is too low during if cold pressing, and veneer can appropriateness raising hot press platen temperature and raising cold press platen temperature (by reducing the adjustment of cooling water inflow way) solution in conjunction with bad.Three-ply board is thin, can separate the slab of two groups of three-ply boards with corrosion resistant plate to overlap, and suppresses as an assembly, and it is thin to solve three-ply board, slab by hot press to cold press easily lower the temperature problem and raising output.The present invention also can replace the HDPE film with PP or PVC plastic sheeting, hot pressing temperature in the production process is about 180 ℃ with the PP film, with the PVC film is about 170 ℃, other no change, slab cool off take out after good, keep flat, saw limit, stable back, husky light, finished product classification.

HDPE glued board gummed intensity of the present invention (Mpa) is as follows by the GB assay:

1.35；0.95；0.96；1.43；

1.14；1.27；1.35；1.10；

1.02；1.06；0.97；1.45；

HDPE glued board boiling water boils a hour intensity does not have significant change.

Claims

1., a kind of high density polyethylene (HDPE) wood plywood production method, it is characterized in that: rolling pin hole on both sides' cemented surface that each veneer glues together mutually, spread density polyethylene film with high between the veneer, the glued board assembly is placed on heating on the hot press, pressurization earlier, and then moves on to pressurization on the cold press, cooling.

2., according to the method for claim 1 regulation, it is characterized in that veneer pin hole specification is nearly taper, last aperture 0.3-0.4mm, the hole center distance is 1.8-2mm, hole depth is 0.4-1mm.

3., according to the method for claim 1 regulation, it is characterized in that density polyethylene film with high thickness is about 0.13mm

4., according to the method for claim 1 regulation, it is characterized in that and can replace density polyethylene film with high with polypropylene or polyvinyl chloride film.

5., according to the method for claim 1 regulation, it is characterized in that heating-up temperature is respectively on the hot press: with the density polyethylene film with high heating-up temperature is about 158 ℃; With the polypropylene screen heating-up temperature is about 180 ℃, is about 170 ℃ with the polychloroethylene film heating-up temperature.

6., according to the method for claim 1 regulation, it is characterized in that the earlier little pressure heating of hot press, after being heated to again intensified pressure to about 10 kg/cm.

7., according to the method for claim 1 regulation, it is characterized in that cold press is pressurized to earlier about 11 kg/cm, it is about 65 ℃ that back water flowing is cooled to the plate central temperature.