CN-121973305-A - Preparation method of recombined bamboo based on glue dipping bamboo Shu Hanshui rate gradient difference directional assembly

CN121973305ACN 121973305 ACN121973305 ACN 121973305ACN-121973305-A

Abstract

The invention discloses a preparation method of recombined bamboo based on gradient difference directional assembly of impregnated bamboo Shu Hanshui, which comprises the following steps of grading dried impregnated bamboo bundles according to water content values, wherein the difference between the upper limit value and the lower limit value of the water content range of each stage is 3% -8%, paving the graded impregnated bamboo bundles in a mirror symmetry manner according to layers, wherein the water content levels of the impregnated bamboo bundles of the same layer are the same, the water content of the impregnated bamboo bundles gradually increases from a core layer to a surface layer, the difference between the water content of the core layer and the water content of the surface layer is 10% -25%, a slab is obtained, hot-press molding the slab, and cooling the slab without balancing treatment to obtain recombined bamboo. According to the preparation method of the recombined bamboo based on the impregnated bamboo Shu Hanshui gradient difference directional assembly, the impregnated bamboo bundles are subjected to moisture content grading, and paving is carried out according to the grading result, so that a balancing link is omitted, a matched humidifying workshop is not needed, secondary problems such as mildew of the impregnated bamboo bundles possibly caused by long-time stacking are avoided, the production period is shortened, and the process stability is improved.

Inventors

XU KANG
JIANG XIANLI
YANG SITONG
YUAN XINTONG
ZHANG YIFANG
LIU QUANJUN
LI XINGONG
YANG KAI

Assignees

中南林业科技大学

Dates

Publication Date: 20260505
Application Date: 20260206

Claims (10)

1. A method for preparing recombined bamboo based on gradient difference directional assembly of impregnated bamboo Shu Hanshui is characterized by comprising the following steps: S1, grading the dried gum-dipped bamboo bundles according to water content values, wherein the difference between the upper limit value and the lower limit value of the water content range of each stage is 3% -8%; s2, carrying out mirror symmetry pavement on the classified impregnated bamboo bundles according to layers, wherein the water content levels of the impregnated bamboo bundles of the same layer are the same, the water content of the impregnated bamboo bundles of the same layer is gradually increased from the core layer to the surface layer, and the difference between the water content of the core layer and the water content of the surface layer is 10-25%, so as to obtain a slab; s3, hot-press molding the plate blank, and cooling to obtain the recombined bamboo.
2. The method for preparing the recombined bamboo based on the gradient difference directional assembly of the impregnated bamboo Shu Hanshui according to claim 1, wherein the step of grading the dried impregnated bamboo bundles according to the water content value comprises the following steps: a1, fluffing bamboo strips into bamboo bundles, drying until the water content is 8% -10%, and carrying out heat preservation treatment at 170-190 ℃ to obtain heat-treated bamboo bundles; A2, soaking the heat-treated bamboo bundles in an adhesive, and drying until the water content is 1% -30%, so as to obtain impregnated bamboo bundles; A3, detecting the water content of the impregnated bamboo bundles, and dividing the impregnated bamboo bundles into a plurality of grades according to the water content value.
3. The method for preparing the recombined bamboo based on the gradient difference directional assembly of the impregnated bamboo Shu Hanshui rate according to claim 2, wherein in the step A3, the difference between the upper limit value and the lower limit value of the water content range of each stage is 3% -5%.
4. The method for preparing the recombined bamboo based on the impregnated bamboo Shu Hanshui rate gradient difference directional assembly according to claim 1, wherein in the step S2, the mirror symmetry paving process comprises the following steps: B1, according to the target total water content W of the plate blank, the total number n of the gum dipping bamboo bundle layers and the nominal water content of the ith gum dipping bamboo bundle layer And the mass distribution coefficient of the ith impregnated bamboo bundle layer The paving quality m i of the ith layer of impregnated bamboo bundle layer is obtained according to the following formula, wherein the moisture content level of the impregnated bamboo bundles in the ith layer of impregnated bamboo bundle layer is the same; In the above-mentioned method, the step of, ; B2, respectively obtaining the absolute dry mass of the ith layer according to the following formula according to the paving mass m i of the ith layer And the actual absolute dry mass m dry of the slab, ; ; B3, according to the actual absolute dry mass m dry of the plate blank and the nominal water content of the ith layer of gum dipping bamboo bundle layer The actual total water content of the slabs is obtained according to the following steps And the actual average water content of the slab ; ; ; B4, judging the error value between the actual absolute dry mass M dry of the plate blank and the target absolute dry mass M and the actual average water content of the plate blank And a target average water content Whether the error values are respectively within a preset range or not, if so, paving each layer in mirror symmetry according to the paving quality m i of the step B1, otherwise, adjusting the quality distribution coefficient Step B1 is re-executed.
5. The method for preparing the recombined bamboo based on the impregnated bamboo Shu Hanshui rate gradient difference directional assembly according to claim 4, wherein the method further comprises the following steps before the step B1: C1, determining a target absolute dry mass M of the plate according to a target density rho of the plate and a target volume V of the plate; c2, according to the target absolute dry mass M and the target average water content of the plate Determining the absolute dry quality of a slab ; C3, according to the absolute dry quality of the slab Average water content with target A target total moisture W of the slab is determined.
6. The method for preparing the recombined bamboo based on the gradient difference directional assembly of the impregnated bamboo Shu Hanshui as set forth in claim 5, wherein in the step C1, ; In the step C2 of the process, ; In the step C3 of the process, 。
7. The method for preparing the recombined bamboo based on the impregnated bamboo Shu Hanshui rate gradient difference directional assembly, which is disclosed in claim 4, is characterized in that: In the step B1 of the process, Nominal water content of the impregnated bamboo bundle with j-th water content level , J is the water content grade, MC s is the upper limit value of the water content of the j-th-level gum dipping bamboo bundle, MC x is the lower limit value of the water content of the j-th-level gum dipping bamboo bundle, and j is the water content grade; In the step B1 of the process, , Is a weight parameter; In the step B4, the preset range value of the error value between the actual absolute mass M dry of the plate blank and the target absolute mass M is 0.1g; in step B4, the actual average water content of the slab And a target average water content The preset range value of the error value between is 1%.
8. The method for preparing the recombined bamboo based on the gradient difference directional assembly of the impregnated bamboo Shu Hanshui rate, which is disclosed in claim 4, is characterized in that in the step S3, the temperature is 140-160 ℃ during hot press molding, the pressure is 4-6 MPa, and the time is 35-50 min.
9. A reorganising bamboo preparation system based on a gradient difference directional assembly of impregnated bamboo Shu Hanshui, comprising a microprocessor and a memory connected with each other, wherein the microprocessor is programmed or configured to execute the reorganising bamboo preparation method based on the gradient difference directional assembly of impregnated bamboo Shu Hanshui according to any one of claims 1 to 8.
10. A computer readable storage medium having a computer program stored therein, wherein the computer program is programmed or configured by a microprocessor to perform the method of preparing a reconstituted bamboo based on a gradient difference oriented assembly of impregnated bamboo Shu Hanshui as defined in any one of claims 1 to 8.

Description

Preparation method of recombined bamboo based on glue dipping bamboo Shu Hanshui rate gradient difference directional assembly Technical Field The invention relates to the technical field of recombined bamboo, in particular to a method for preparing recombined bamboo based on Shu Hanshui-rate gradient difference directional assembly of impregnated bamboo. Background The recombined bamboo is prepared from bamboo through mechanical fluffing, high-temperature heat treatment, resin impregnation and drying treatment to obtain impregnated bamboo bundles, and assembling and hot-pressing the impregnated bamboo bundles. Hot pressing is an important procedure for influencing the physical and mechanical properties of the recombined bamboo, and the hot pressing forming quality is closely related to the moisture content and distribution of the impregnated bamboo bundles after drying. Therefore, a scientific and reasonable drying treatment is required after the resin impregnation. Considering drying energy consumption, drying quality and drying efficiency comprehensively, more and more enterprises adopt conventional drying technology to dry the gum-dipped bamboo bundles. However, as a plurality of impregnated bamboo bundles are stacked in bundles (each bundle has a cross-section diameter of about 15 cm) in the conventional drying process, the impregnated bamboo bundles in each bundle are easy to interweave, the wet heat exchange between the impregnated bamboo bundles and a drying medium is affected, and an obvious water content gradient is formed from inside to outside after drying, namely the water content of the impregnated bamboo bundles in the core layer area in the same bundle is obviously higher, and the water content of the impregnated bamboo bundles in the surface layer area is obviously lower, and the difference of the two is even more than 20%. If such a gum dipping bamboo bundle with very large water content difference is not subjected to dividing and the structural design and optimization, and is directly paved and hot-pressed, because the recombined bamboo bundle is paved randomly, the gum dipping bamboo bundles with higher water content can appear on the surface layer and also can appear on the core layer, when the gum dipping bamboo bundles with higher water content are arranged on the core layer, the local water content in the hot-pressing process can be higher, and especially when the gum dipping bamboo bundles with higher water content are arranged on the core layer, the steam pressure aggregation of the core layer can be caused, so that the hot-pressing defects such as bubbling, board explosion and the like are extremely easy to cause. In the hot pressing process of wood artificial boards such as wood fiber boards, shaving boards and the like, the plastic deformation is realized through softening and hot pressing, so that the problems of board explosion, strength reduction and the like caused by high water content are avoided, the unit water content is usually controlled at a lower level, the control of two layers of water content of a surface layer and a core layer is generally adopted, and the water content difference of the surface core layer is about 2% -4%. The existing bamboo wood-based panel technology is mostly used for referencing wood-based panels, but the volume of the glued bamboo bundles of the recombined bamboo units is larger, and the glued bamboo bundles are more seriously affected by the water content. In the prior art, the traditional surface core layers are adopted for layering, the water content difference of the surface core layers is only 2% -6%, the gum dipping bamboo bundles with the water content within the range of 1% -7% and 15% -30% generated after drying can be paved and assembled after being additionally subjected to balancing, surface humidification and other treatments, and the production energy consumption and the production cost are increased. Disclosure of Invention The invention aims to solve the technical problem of overcoming the defects of the prior art and providing a recombined bamboo preparation method with low production cost and good performance based on the gradient difference directional assembly of impregnated bamboo Shu Hanshui. In order to solve the technical problems, the invention adopts the following technical scheme: A method for preparing recombined bamboo based on gum dipping bamboo Shu Hanshui gradient difference directional assembly comprises the following steps: S1, grading the dried gum-dipped bamboo bundles according to water content values, wherein the difference between the upper limit value and the lower limit value of the water content range of each stage is 3% -8%; s2, carrying out mirror symmetry pavement on the classified impregnated bamboo bundles according to layers, wherein the water content levels of the impregnated bamboo bundles of the same layer are the same, the water content of the impregnated bamboo bundles of the same layer i