CN108638229A - A method of preparing light-duty container bottom plate using fast growing wood veneer - Google Patents

Abstract

The present invention relates to a kind of method preparing light-duty container bottom plate using fast growing wood veneer, this method comprises the technical steps that：Veneer is made in fast growing wood；Veneer is subjected to taxonomic revision according to the configuration sequence in structure of plate slab；Veneer after arrangement is fitted into vacuum pressure impregnation container, is first vacuumized, after vacuum degree reaches 0.095~0.09MPa, 10~20min is kept, multiple-effect modifying agent is then injected into, hereafter pressurization keeps 15~30min, internal pressure is released, impregnating autoclave is opened and takes out the veneer after dipping；Veneer drying after dipping modifying agent to moisture content is not higher than 10%；The two-sided painting phenolic resin adhesive of veneer sandwich layer, 280~350g/m of glue-spread², assembly then is carried out according to assemble pattern, the slab configured is sent into precompressed in cold press；Slab is hot-forming：The slab pressed in advance is fitted into hot-forming in hot press, then heating platen is cooled to 90 DEG C or less and unloads plate, neat to stack for 24 hours, and by standard specification size saw side, fixed thickness sanding, finished product is made.

Description

A method of using fast-growing wood veneer to prepare light container bottom plate

technical field

The invention relates to a method for preparing the bottom plate of a light container by using fast-growing wood through veneer strengthening treatment and then gluing. The utility model belongs to the technical fields of forestry engineering, wood processing and wood-based panels.

technical background

The container floor is the main load-bearing component of the container. The lightweight of the container floor not only greatly reduces the transportation cost, but also has great significance in reducing the labor intensity of the production and installation of the floor. The traditional container floor is mainly plywood floor made of Southeast Asian tropical hardwood Abidon, clone or European birch, and the density is generally 0.85g/cm ³ . Since the beginning of the 21st century, due to the decreasing tropical hardwood resources and the need for forest ecological protection, most of the container bottom plates are made of artificial forest wood, bamboo and other materials, and composite container bottom plates made of composite structures. The density generally exceeds 0.90g/cm ³ , and causes the thickness deviation of the bottom plate and the thickness expansion rate to be large.

Contents of the invention

The technical solution of the present invention: a method for preparing a light-weight container floor by using a fast-growing wood veneer, the method includes the following process steps:

A kind of method that utilizes fast-growing wood veneer to prepare light-duty container base plate, this method comprises following process step:

Step 1: Make fast-growing wood into veneers and dry until the moisture content is lower than 16%; classify the veneers according to the arrangement sequence in the slab structure;

Step 2: Put the sorted veneer into the vacuum pressure impregnation container, first vacuum, when the vacuum degree reaches -0.095 ~ 0.09MPa, keep it for 10 ~ 20min, then inject the multi-effect modifier, and then pressurize to 0.8 ~1.2MPa, keep it for 15~30min, release the internal pressure, pump out the multi-effect modifier to the storage tank, open the impregnation tank and take out the impregnated veneer;

Step 3: drying the veneer impregnated with modifier until the moisture content is not higher than 10%;

Step 4: Coat the core layer of the modified veneer with phenolic resin adhesive on both sides, the amount of glue applied is 280-350g/m ² , and then assemble the blanks according to the blank assembly method, and send the configured blanks into cold pressing Pre-pressing in the machine, unit pressure 0.8-1.5MPa, pre-pressing time 20-40min;

Step 5: Hot pressing of slabs: put the pre-pressed slabs into a hot press for hot pressing, the hot pressing temperature is 125°C~145°C, the hot pressing time is 35~45min, and then the temperature of the hot pressing plate is lowered to 90°C Unload the boards below, stack them neatly for 24 hours, saw the edges according to the standard size, sand them with a fixed thickness, (or cut the edges according to the customer's specifications), and make a finished product.

The further design of the method for preparing the bottom plate of a light-weight container by using a fast-growing wood veneer is that the thickness of the veneer in step 1 is 1.8mm or 2.0mm.

The described method of utilizing fast-growing wood veneers to prepare light-duty container bottom plates is further designed in that: the multi-effect modifier described in step 2 includes reinforcing resin, toughening agent, insect repellant and curing agent, and its mass ratio is that of reinforcing resin : toughening agent: insect repellant: curing accelerator=100: (0-10): (0.1-0.5): (1-3).

The method for preparing a light-weight container bottom plate by using fast-growing wood veneer is further designed in that: wherein the reinforcing resin is etherified 2D resin or etherified hexahydroxy resin.

The method for preparing a light-weight container bottom plate by using fast-growing wood veneer is further designed in that: the toughening agent refers to cashew nut oil or methyl glucoside.

The method for preparing plywood for high-strength engineering structures by using fast-growing wood veneers is further designed in that: the insect repellant refers to pyrethroid insect repellent.

The method for preparing the light-duty container floor by utilizing fast-growing wood veneer is further designed in that: the curing agent refers to a mixture of Lewis acid and phosphoric acid or citric acid, and the mass ratio is Lewis acid: phosphoric acid or citric acid=(60～ 80): (40～20).

The method for preparing the bottom plate of a light-weight container by using fast-growing wood veneer is further designed in that: the veneer impregnated with modifier in step 3 is placed in a roller drying or hot plate dryer at a temperature of 75°C to 95°C Dry under conditions until the moisture content is less than 10%.

The further design of the method for preparing plywood for high-strength engineering structures by using fast-growing wood veneer is that the thickness of the finished product is 28±0.8mm.

The method for preparing the light-weight container bottom plate by using fast-growing wood veneer is further designed in that: the method of forming the blank described in step 4 is as follows:

If the thickness of the veneer is 1.8mm, the blank assembly method is: 3 vertical layers + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 1 layer Vertical + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 3 vertical layers; that is, a total of 17 layers, the thickness of the slab is 30.6mm;

If the thickness of the veneer is 2.0mm, then the billet assembly method is: 3 vertical layers + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 3 vertical layers + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 3 layers portrait. That is, there are 15 layers in total, and the thickness of the slab is 30.0mm.

The beneficial effects of the present invention are:

The present invention adopts artificial forest wood veneer, through multi-effect modification treatment such as hardening, strengthening, toughening, and insect-proofing, so that the mechanical properties and dimensional stability of the veneer itself are greatly improved, and the veneer is further compressed in the process of hot pressing and gluing. The rate is small. The density of the finished container floor is relatively low, generally no more than 0.75g/cm ³ , not only has high strength and excellent weather resistance, but also has a uniform structure and stable size, and at the same time improves the utilization value of fast-growing wood in plantations.

Detailed ways

The present invention is further described below by embodiment:

Example 1:

Select a number of air-dried poplar veneers with a thickness of 1.8mm, dry them until the moisture content is lower than 16%, put them into a vacuum pressure impregnation tank after finishing, evacuate to -0.09MPa, keep for 15min, and inject a multi-effect with a concentration of 45%. Modifier (the multi-effect modifier is composed of diethylene glycol etherified 2D resin, cashew nut oil, deltamethrin insect repellant, zinc chloride and phosphoric acid, and its mass ratio is 100:2:0.1:3 : 1), pressurize to 1.0MPa, hold for 30min, release the pressure, return the multi-effect modifier to the liquid storage tank, take out the veneer and drain it, and dry it in a roller dryer or a hot plate dryer at a temperature of 90°C to a moisture content of 8%; after the veneer is cooled, apply phenolic glue on both sides of the core board with an amount of 300g/m ² , and then follow 3 vertical layers + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 1 Layer horizontal + 1 vertical layer + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 3 vertical layers to form a 17-layer slab, pre-pressed at a pressure of 1.0MPa for 30min , sent to a hot press for hot pressing, temperature 130°C, hot pressing pressure 1.5MPa, hot pressing time 40min, then cooled to 90°C, unloaded board, placed for 24h, trimmed, sanded to 28mm in thickness, and made into a light container bottom plate.

The main physical and mechanical performance indicators of the light container floor are: moisture content 6.8%, density 0.73g/cm ³ , longitudinal static bending strength 98.4MPa, longitudinal elastic modulus 11107MPa, transverse static bending strength 34.6MPa, transverse elastic modulus 3240MPa, surface wear resistance (abrasion value 0.09g/100r).

Example 2:

Select air-dried poplar veneer with a thickness of 2.0mm, dry it until the moisture content is lower than 16%, put it into a vacuum pressure impregnation tank after finishing, evacuate to -0.09MPa, keep it for 15min, and inject a multi-effect modification with a concentration of 50%. Sex agent [multi-effect modifier is composed of methanol etherification 2D and mixed resin (mass ratio 80:20) of hexahydroxy resin, methyl glucoside, cypermethrin insect repellant, zinc chloride and citric acid (mass ratio 90:10) It is made by mixing and compounding, and its mass ratio is 100:3:0.2:3], pressurize to 1.0MPa, keep it for 20min, release the pressure, return the multi-effect modifier to the liquid storage tank, take out the veneer and drain, and impregnate The veneer after the modifier is placed in a roller drying or hot plate dryer at a temperature of 75°C to 95°C and dried until the moisture content is lower than 10%; after the veneer is cooled, the core plate is coated with phenolic adhesive on both sides The amount of glue is 320g/m ² , and 15 layers are formed according to the prescribed method of 3 vertical layers + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 3 vertical layers + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 3 vertical layers The slab was pre-pressed at a pressure of 1.0MPa for 30 minutes, sent to a hot press for hot pressing at a temperature of 130°C, a hot pressing pressure of 1.5MPa, and a hot pressing time of 40 minutes, then cooled to 90°C, unloaded, and placed for 24 hours. The edge is sanded to 28mm in thickness to make a light container bottom plate.

The main physical and mechanical performance indicators of the light container floor are: moisture content 6.2%, density 0.71g/cm ³ , longitudinal static bending strength 105.3MPa, longitudinal elastic modulus 11410MPa, transverse static bending strength 31.8MPa, transverse elastic modulus 3157MPa, surface wear resistance (abrasion value 0.09g/100r).

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any skilled person who is familiar with the profession, without departing from the scope of the technical solutions of the present invention, according to the technical essence of the present invention, Any simple modifications, equivalent replacements and improvements made in the above embodiments still fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. a method utilizing fast-growing timber veneer to prepare light-duty container bottom plate is characterized in that the method comprises the following processing steps: Step 1: Make fast-growing wood into veneers and dry until the moisture content is lower than 16%; classify the veneers according to the arrangement sequence in the slab structure; Step 2: Put the sorted veneer into the vacuum pressure impregnation container, first vacuum, when the vacuum degree reaches -0.095 ~ 0.09MPa, keep it for 10 ~ 20min, then inject the multi-effect modifier, and then pressurize to 0.8 ~1.2MPa, keep it for 15~30min, release the internal pressure, pump out the multi-effect modifier to the storage tank, open the impregnation tank and take out the impregnated veneer; Step 3: drying the veneer impregnated with modifier until the moisture content is not higher than 10%; Step 4: Coat the core layer of the modified veneer with phenolic resin adhesive on both sides, the amount of glue applied is 280-350g/m ² , and then assemble the blanks according to the blank assembly method, and send the configured blanks into cold pressing Pre-pressing in the machine, unit pressure 0.8-1.5MPa, pre-pressing time 20-40min; Step 5: Hot pressing of slabs: put the pre-pressed slabs into a hot press for hot pressing, the hot pressing temperature is 125°C~145°C, the hot pressing time is 35~45min, and then the temperature of the hot pressing plate is lowered to 90°C Unload the boards below, stack them neatly for 24 hours, saw the edges according to the standard size, and sand them to a certain thickness to make a finished product. 2. The method for preparing the bottom plate of a light-weight container by using a fast-growing wood veneer according to claim 1, wherein the thickness of the veneer in step 1 is 1.8mm or 2.0mm. 3. the method for utilizing fast-growing wood veneer to prepare light-duty container bottom plate according to claim 1, is characterized in that: the multi-effect modifier described in step 2 comprises reinforcing resin, toughening agent, insect repellant and curing agent, and its The mass ratio is reinforcing resin: toughening agent: insect repellent: curing accelerator=100: (0-10): (0.1-0.5): (1-3). 4. The method for preparing a light-weight container floor by using fast-growing wood veneers according to claim 3, wherein the reinforcing resin is etherified 2D resin or etherified hexahydroxy resin. 5. The method for preparing a light-weight container bottom plate by using fast-growing wood veneer according to claim 3, characterized in that: said toughening agent refers to cashew nut oil or methyl glucoside. 6 . The method for preparing the bottom plate of a light-weight container by using fast-growing wood veneer according to claim 3 , wherein the insect repellent refers to a pyrethroid insect repellant. 7 . 7. the method for utilizing fast-growing wood veneer to prepare light container bottom plate according to claim 3, is characterized in that: described curing agent refers to the mixture of Lewis acid and phosphoric acid or citric acid, and the mass ratio is Lewis acid: phosphoric acid or lemon Acid=(60～80):(40～20). 8. The method for preparing a light-duty container bottom plate by using fast-growing wood veneer according to claim 1, characterized in that: the veneer impregnated with modifying agent in step 3 is placed in a roller drying or hot plate dryer at a temperature of Dry at 75°C to 95°C until the moisture content is less than 10%. 9. The method for preparing a light-weight container bottom plate by using a fast-growing wood veneer according to claim 1, characterized in that: the thickness of the finished product is 28±0.8mm. 10. The method for preparing a light-weight container bottom plate by using a fast-growing wood veneer according to claim 8, characterized in that: the method of forming the blank described in step 4 is as follows: If the thickness of the veneer is 1.8mm, the blank assembly method is: 3 vertical layers + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 1 layer Vertical + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 3 vertical layers; that is, a total of 17 layers, the thickness of the slab is 30.6mm; If the thickness of the veneer is 2.0mm, then the billet assembly method is: 3 vertical layers + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 3 vertical layers + 1 horizontal layer + 1 vertical layer + 1 horizontal layer + 3 layers portrait. That is, there are 15 layers in total, and the thickness of the slab is 30.0mm.