CN115476417A - Method for forming bamboo skateboard surface - Google Patents
Method for forming bamboo skateboard surface Download PDFInfo
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- CN115476417A CN115476417A CN202211187956.8A CN202211187956A CN115476417A CN 115476417 A CN115476417 A CN 115476417A CN 202211187956 A CN202211187956 A CN 202211187956A CN 115476417 A CN115476417 A CN 115476417A
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- 235000017166 Bambusa arundinacea Nutrition 0.000 title claims abstract description 169
- 235000017491 Bambusa tulda Nutrition 0.000 title claims abstract description 169
- 241001330002 Bambuseae Species 0.000 title claims abstract description 169
- 235000015334 Phyllostachys viridis Nutrition 0.000 title claims abstract description 169
- 239000011425 bamboo Substances 0.000 title claims abstract description 169
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000007731 hot pressing Methods 0.000 claims abstract description 61
- 238000005470 impregnation Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 13
- 244000302661 Phyllostachys pubescens Species 0.000 claims abstract description 7
- 235000003570 Phyllostachys pubescens Nutrition 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 11
- 239000003513 alkali Substances 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000003801 milling Methods 0.000 claims description 4
- 239000005011 phenolic resin Substances 0.000 claims description 4
- 229920001568 phenolic resin Polymers 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000007602 hot air drying Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 238000007598 dipping method Methods 0.000 claims 2
- 238000009966 trimming Methods 0.000 claims 1
- 238000000465 moulding Methods 0.000 abstract description 2
- 239000012670 alkaline solution Substances 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 18
- 239000002023 wood Substances 0.000 description 8
- 238000005452 bending Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000004513 sizing Methods 0.000 description 5
- 239000002585 base Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000002356 single layer Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 240000004144 Acer rubrum Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27J—MECHANICAL WORKING OF CANE, CORK, OR SIMILAR MATERIALS
- B27J1/00—Mechanical working of cane or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
- B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/06—Softening or hardening of wood
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/02—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by compressing
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Forests & Forestry (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a method for forming a bamboo skateboard, which uses phyllostachys pubescens as a raw material, and is soaked in alkaline solution after pretreatment, and softened at high temperature by using high-temperature supersaturated steam; unfolding the softened bamboo joints, performing hot-pressing flattening to obtain flattened bamboo joints, and performing combined softening treatment on the flattened bamboo joints: the combined softening treatment mode is that microwave treatment is firstly carried out on flattened bamboo joints, high-temperature supersaturated steam is introduced after the treatment is finished, the operation is carried out for 2-3 times in a circulating way, secondary hot-pressing flattening is carried out after the operation is finished, and the thickness of single bamboo layers obtained by slicing is controlled to be 3-4 mm after the secondary hot-pressing flattening is finished; and then, drying by hot air, taking out, performing vacuum impregnation, assembling, performing hot press molding after the assembling is finished, and finally taking out the molded blank material to perform manufacturing steps such as edge sawing, profiling and the like to obtain the finished bamboo sliding plate surface. The bamboo skateboard deck prepared by the invention has uniform internal structure, better elasticity and structural stability for the external surface, and is suitable for serving as the skateboard deck.
Description
Technical Field
The invention relates to the technical field of bamboo wood processing, in particular to a method for forming a bamboo skateboard surface applied to a skateboard surface.
Background
The skateboard sports have the physical training with good stimulation, interestingness, pleasure and special effects, and are popular with teenagers. The skateboard is a necessary sports apparatus for skateboard sports, and mainly comprises a skateboard surface, a bracket, a buffer cushion (buffer frame), wheels and the like. When the skateboard is used, a user steps on the upper surface of the skateboard surface with two feet to operate the skateboard so as to slide on the road surface, one foot of the user is placed at the front part of the skateboard surface, and the other foot continuously steps backwards to the ground, so that the skateboard obtains a certain speed to drive the user and the skateboard to move forwards together; the quality of the skateboard surface can directly influence the experience of the user.
The traditional skateboard is formed by hot-pressing Canadian maple, the requirement on a pressing process is high, and with the reduction of the quantity of related forest resources and the limitation of import, the raw materials are more and more expensive, and the manufacturing cost is higher and higher.
For the reasons, some skateboard surfaces made of alternative materials appear in the market, wherein the skateboard surfaces comprise bamboo boards; the bamboo resources are abundant in the domestic southern area, and the bamboo has the characteristics of high growth speed, short wood forming period, high strength and good toughness and is in accordance with the requirements of the structural strength, elasticity and structural stability of the surface of the skateboard; however, the bamboo wood has defects based on the growth characteristics of the bamboo, the thickness and density of the upper part and the lower part of the bamboo body are obviously different, and the bamboo wood has a bamboo joint structure, so that the bamboo sheets after thin cutting are easy to have structural defects in the board surface after expansion forming and superposition hot pressing, and are difficult to be pressed into a bent structure after one-time assembly hot pressing, the conditions of cracking and interlayer peeling are easy to occur, the board surface defects are caused, and the yield is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for forming a bamboo skateboard surface, so as to solve the defects in the technical background.
The technical problem solved by the invention is realized by adopting the following technical scheme:
a method for forming a bamboo skateboard surface specifically comprises the following operation steps:
s1, using phyllostachys pubescens as a raw material, cutting to a fixed length, removing a bamboo green layer and a bamboo yellow layer, opening bamboo joints, and performing inner circle milling and polishing on the inner surfaces of the bamboo joints; then longitudinally slitting the bamboo joints, soaking the bamboo joints by using alkali liquor, cleaning the bamboo joints after the treatment is finished, and performing high-temperature softening treatment by using high-temperature supersaturated steam;
s2, unfolding the bamboo joints subjected to high-temperature softening treatment, performing hot-pressing flattening to obtain flattened bamboo joints, and performing combined softening treatment on the flattened bamboo joints:
the combined softening treatment mode is that microwave treatment is firstly carried out on flattened bamboo joints, high-temperature supersaturated steam is introduced after the treatment is finished, the operation is carried out for 2-3 times in a circulating way, secondary hot-pressing flattening is carried out after the operation is finished, and the thickness of single bamboo layers obtained by slicing is controlled to be 3-4 mm after the secondary hot-pressing flattening is finished; then hot air drying is carried out, so that the water content of the bamboo chips is reduced to below 8%, and then the bamboo chips are taken out;
s3, carrying out vacuum impregnation treatment on the bamboo chips, assembling the bamboo chips in a vertically and horizontally overlapping mode after the impregnation treatment is finished, conveying the assembled blank materials into a forming device for hot press forming, discharging high-temperature steam in a die at the tail end of the hot press forming, continuously introducing low-temperature gas to quickly cool the blank materials, taking out the formed blank materials, and carrying out edge sawing, profiling and other manufacturing steps to obtain the finished bamboo sliding plate surface.
As a further limitation, when the alkali liquor soaking treatment is carried out in the step S1, the alkali liquor used for soaking is NaOH or KOH solution with the mass fraction of 1-4 wt%, the soaking temperature is 45-60 ℃, and the soaking treatment time is 12-18 h.
As a further limitation, when the high-temperature supersaturated steam is softened at high temperature in step S1, the temperature of the introduced high-temperature supersaturated steam is 130-150 ℃, the steam pressure is 0.8-1.0 MPa, and the high-temperature treatment time is 15-20 min.
As a further limitation, when the hot pressing flattening is carried out in the step S2, the hot pressing temperature is 70 to 90 ℃, the hot pressing pressure is 1.5 to 2.5MPa, and the hot pressing time is 2 to 3min; and when the secondary hot pressing flattening is carried out, the hot pressing temperature is 70-90 ℃, the hot pressing pressure is 3-4 MPa, and the hot pressing time is 1-3 min.
Further, when the microwave treatment is performed in step S2, the humidity of the microwave volume chamber is controlled to be 70-80%, the microwave power is controlled to be 650-700W, and the treatment is performed for 15-30 min.
As a further limitation, the impregnation sizing material adopted when the bamboo chips are subjected to vacuum impregnation treatment is epoxy resin sizing material or phenolic resin sizing material.
By way of further limitation, when the bamboo chips are superposed and assembled, the number of the laminated layers is controlled to be 3-4, and the bamboo fiber of the bamboo chip positioned at the uppermost position in the 3-4 layers of bamboo chips is parallel to the length direction of the surface of the skateboard.
As a further limitation, when the bamboo chips are superposed and assembled, a layer of sliced bamboo chips is lined between the adjacent bamboo chips, the thickness of each sliced bamboo chip is 0.2-0.3 mm, and the bamboo fibers of the sliced bamboo chips are parallel to the length direction of the surface of the sliding plate.
And as a further limitation, when the hot press molding is carried out in the step S3, the hot press temperature is controlled to be 120-130 ℃, the pressing is carried out by using the pressure of 4-6 Mpa and then is kept for 3-5 min, then the hot press pressure is increased to 12-15 Mpa and kept for 20-30 min, then the temperature of the pressure surface is reduced to 70-90 ℃ and kept for 10min, then low-temperature gas is continuously introduced, the blank is rapidly cooled to the room temperature and kept for 3-5 min, and then the pressure is released, so that the subsequent edge sawing and profiling operation can be carried out.
Has the advantages that: the method for forming the bamboo skateboard surface can be used for obtaining the bamboo skateboard surface for processing the skateboard, the bamboo skateboard surface can be bent and formed in the forming process, and the bamboo skateboard has the advantages of high static bending strength, high impact strength, small water absorption expansion rate and good dimensional stability, has better strength and elastic deformation performance, and has the advantages of no cracking, no fracture, beautiful appearance and no barb on the surface.
Detailed Description
In order to make the technical means, the technical features, the technical purposes and the effects of the invention easily understood and appreciated, the technical solutions in the embodiments of the present invention are clearly and completely described below.
This embodiment is only a part of the embodiment of the present invention, and represents the whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terms "comprises" and "comprising," and any variations thereof, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order, but rather for describing a sequential or chronological order, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed.
In the first embodiment, the bamboo skateboard surface is manufactured in the following way when being processed:
selecting fresh phyllostachys pubescens with the water content of 45-50% as a raw material, placing the cut phyllostachys pubescens in a ventilation position for one day, removing green and yellow, removing heads, tails and bamboo branches and leaves, cutting the obtained body part of the bamboo rod body at equal length, removing bamboo joints on the outer surface of the bamboo tube, grinding and polishing, opening inner joints, and milling and polishing the inner surface of the bamboo tube to obtain the bamboo tube body with smooth outer surface and outer surface.
Longitudinally slitting the bamboo joints, soaking the slit bamboo joints by using NaOH alkali liquor with the mass fraction of 3wt% under the constant temperature condition of a water bath at 55 ℃, wherein the soaking time is 12h, cleaning the bamboo joints by using running water after the treatment is finished, putting the bamboo joints into a sealed tank, introducing high-temperature supersaturated steam at 130-135 ℃, controlling the pressure in the sealed tank to be 1.0 +/-0.05 MPa, and performing high-temperature softening treatment for 20min to obtain the softened bamboo joints after the treatment is finished.
The obtained softened bamboo joints are arranged at the longitudinal seam cutting position, the unfolded bamboo joints are sent into a flat press for hot pressing and flattening, the temperature of a working area for hot pressing and flattening is set to be 90 ℃ on the flat press, the hot pressing pressure is 2.2MPa, the flattened bamboo joints are obtained after 180S hot pressing treatment, then the flattened bamboo joints are subjected to combined softening treatment to obtain flattened bamboo joints with more uniform internal structures, and the combined softening treatment mode is as follows:
a, performing microwave treatment on the flattened bamboo joints in a volume cavity, introducing wet steam into the volume cavity to keep the humidity of the volume cavity at 80%, then starting microwave equipment, controlling the microwave power at 700W, and treating for 15min;
b, placing the flattened bamboo joints subjected to microwave treatment into a sealed tank, introducing 130-135 ℃ high-temperature supersaturated steam, controlling the pressure in the sealed tank to be 1.0MPa, and performing high-temperature softening treatment for 5min;
taking the operation steps A and B as a cycle, performing twice cycle operation, taking out, sending into a flat press, performing secondary hot pressing flattening, setting the temperature of a working area for hot pressing flattening to be 90 ℃ and the hot pressing pressure to be 4MPa on the flat press during the secondary hot pressing flattening, and performing hot pressing treatment for 180S to obtain flattened bamboo joints; in the operation steps, bamboo fibers on the surface in the bamboo joints subjected to combined softening treatment are basically in a completely opened state, and can slightly move through flat pressing of a flat press in the secondary hot pressing and flattening operation process, so that defect positions are filled, gaps among the bamboo fibers can be opened, and the impregnation proportion and the impregnation effect are improved in the subsequent vacuum impregnation treatment process.
After the secondary hot pressing and flattening is finished, carrying out sheet treatment on the bamboo wood by using a sheet cutter under the condition of ensuring the pressure, and controlling the thickness of a single layer of the sliced bamboo wood to be 4 +/-0.1 mm; and then hot air drying is carried out, the bamboo chips are taken out after the water content is reduced to below 8%, and the thickness of the corresponding bamboo single layer is reduced to the range value of 3.6-3.7 mm due to dehydration.
Utilize phenolic resin sizing material to carry out the vacuum impregnation processing to the bamboo timber individual layer, make into slice bamboo timber surface and inside impregnated resin glue, carry out the lamination with the coincide mode with the one-tenth bamboo timber after handling the impregnation, during the lamination, the piece bamboo timber vertically and horizontally staggered of adjacent layer coincide, in order to obtain the slide face of 10mm thick in this embodiment, therefore adopt three-layer one-tenth bamboo timber to coincide, in the three-layer one-tenth bamboo timber of coincide, the bamboo fiber of upper strata and lower floor's bamboo chip is parallel with the length direction of slide face, and the bamboo fiber of intermediate level bamboo chip is perpendicular with the length direction of slide face, send into the billet after the completion of the lamination and carry out hot briquetting in the former, carry out syllogic hot briquetting during hot briquetting:
a, controlling the hot pressing temperature to be 120 ℃, and keeping the hot pressing pressure to be 6Mpa for 3min;
b, controlling the hot pressing temperature to be 120 ℃, increasing the hot pressing pressure to 12Mpa, and keeping the hot pressing pressure for 20min;
and C, reducing the hot pressing temperature to 90 ℃, keeping the pressure at 12Mpa, and keeping for 10min.
Then discharging the high-temperature steam in the mould, and continuously introducing low-temperature CO at-15 DEG C 2 And (3) gas is used for rapidly cooling the blank to room temperature and then keeping for 5min, then pressure is released, the shaped blank is taken out and subjected to the manufacturing steps of edge sawing, profiling and the like, and the finished bamboo sliding plate surface of the embodiment I is obtained.
The bamboo skateboard is prepared into one hundred blocks by the method, and the performance detection is carried out: the water content of the surface of the bamboo sliding plate is 7.2-7.5%, the static bending strength is 68-75 MPa measured by a method of national standard GB/T17657-2013, namely physicochemical property test method of artificial board and veneer artificial board, and the elastic modulus is 3880-3940 MPa measured by a method of national standard GB/T1936.2-2009, namely wood bending elastic modulus measurement method; and the surface of the sliding plate is continuously impacted 3000 times under the condition that the weight of the surface of the sliding plate is 60kg and the height of the surface of the sliding plate is 0.8m, so that the surface of the sliding plate is not damaged and interlayer stripping is not generated, and the performance use requirement of the surface of the sliding plate is met.
In the second embodiment, the bamboo skateboard deck is manufactured as follows:
selecting fresh phyllostachys pubescens with the water content of 45-50% as a raw material, placing the cut phyllostachys pubescens in a ventilation position for one day, removing green and yellow, removing heads, tails and bamboo branches and leaves, cutting the obtained body part of the bamboo rod body at equal length, removing bamboo joints on the outer surface of the bamboo tube, grinding and polishing, opening inner joints, and milling and polishing the inner surface of the bamboo tube to obtain the bamboo tube body with smooth outer surface and outer surface.
Longitudinally slitting the bamboo joints, soaking the slit bamboo joints by using NaOH alkali liquor with the mass fraction of 4wt% under the water bath constant temperature condition of 60 ℃, wherein the soaking time is 16h, cleaning the bamboo joints by using running water after the treatment is finished, putting the bamboo joints into a sealed tank, introducing high-temperature supersaturated steam at the temperature of 140-145 ℃, controlling the pressure in the sealed tank to be 0.9 +/-0.05 MPa, and performing high-temperature softening treatment for 18min to obtain the softened bamboo joints after the treatment is finished.
The obtained softened bamboo joints are arranged at the longitudinal seam cutting position, the unfolded bamboo joints are sent into a flat press for hot pressing and flattening, the temperature of a working area for hot pressing and flattening is set to be 80 ℃ on the flat press, the hot pressing pressure is 2.0MPa, the flattened bamboo joints are obtained after hot pressing treatment is carried out for 150S, then the flattened bamboo joints are subjected to combined softening treatment to obtain flattened bamboo joints with more uniform internal structures, and the combined softening treatment mode is as follows:
a, performing microwave treatment on the flattened bamboo joints in a volume cavity, introducing wet steam into the volume cavity to keep the humidity of the volume cavity at 75%, then starting microwave equipment, controlling the microwave power to be 680W, and treating for 25min;
b, placing the flattened bamboo joints subjected to microwave treatment into a sealed tank, introducing 140-145 ℃ high-temperature supersaturated steam, controlling the pressure in the sealed tank to be 0.9 +/-0.05 MPa, and performing high-temperature softening treatment for 6min;
taking the operation steps A and B as a cycle, performing twice cycle operation, taking out, sending into a flat press, performing secondary hot pressing flattening, setting the temperature of a working area for hot pressing flattening to be 90 ℃ and the hot pressing pressure to be 4MPa on the flat press during the secondary hot pressing flattening, and performing hot pressing treatment for 170S to obtain flattened bamboo joints; carrying out lamellar treatment on the bamboo after the secondary hot pressing and flattening is finished, and controlling the thickness of a single layer of the bamboo obtained by the lamellar treatment to be 3.5 +/-0.1 mm; and then the bamboo chips are dried by hot air, the water content of the bamboo chips is reduced to below 8 percent and then the bamboo chips are taken out, and the thickness of the corresponding bamboo single layer is reduced to a value within a range of 3.2-3.35 mm due to dehydration.
Utilize phenolic resin sizing material to carry out vacuum impregnation processing to the bamboo timber individual layer for become piece bamboo timber surface and inside impregnated resin glue, the piece bamboo timber that will dip after the processing carries out the base assembling with the coincide mode, during the base assembling, adjacent layer's piece bamboo timber vertically and horizontally staggered coincide, in order to obtain the slide face of 12mm thick in this embodiment, therefore adopt four layers of piece bamboo timber to coincide, in the four layers of piece bamboo timber of coincide, first layer and third layer bamboo fibre are parallel with the length direction of slide face, and second layer and fourth layer bamboo fibre are perpendicular with the length direction of slide face, in addition still the shaping has the sliced bamboo thin slice of thickness 0.25 +/-0.003 mm between the adjacent piece bamboo timber of position, and the bamboo fibre of these sliced bamboo thin slices is parallel with the length direction of slide face, send the base stock after the base assembling completion into the former and carry out hot briquetting, carry out the syllogic hot briquetting during hot briquetting:
a, controlling the hot pressing temperature to be 130 ℃ and the hot pressing pressure to be 5Mpa, and keeping for 4min;
b, controlling the hot pressing temperature to be 130 ℃, increasing the hot pressing pressure to be 13Mpa, and keeping the hot pressing pressure for 26min;
and C, reducing the hot pressing temperature to 80 ℃, keeping the pressure at 13Mpa, and keeping for 10min.
Then discharging the high-temperature steam in the mould, and continuously introducing low-temperature CO of-15 DEG C 2 And (3) gas is used for rapidly cooling the blank to room temperature and then keeping for 4min, then pressure is released, the shaped blank is taken out and subjected to the manufacturing steps of edge sawing, profiling and the like, and the finished bamboo sliding plate surface of the second embodiment is obtained.
One hundred bamboo skateboard surfaces are manufactured by the method, and performance detection is carried out: the water content of the surface of the bamboo sliding plate is 7.2-7.5%, the static bending strength is 72-76 MPa measured by a method of national standard GB/T17657-2013, namely a method for testing physical and chemical properties of artificial boards and veneers, and the elastic modulus is 3790-3900 MPa measured by a method of national standard GB/T1936.2-2009, namely a method for measuring bending elastic modulus of wood; and the surface of the sliding plate is continuously impacted 3000 times under the condition that the weight of the surface of the sliding plate is 60kg and the height of the surface of the sliding plate is 0.8m, so that the surface of the sliding plate is not damaged and interlayer stripping is not generated, and the performance use requirement of the surface of the sliding plate is met.
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A method for forming a bamboo skateboard surface is characterized by comprising the following operation steps:
s1, using phyllostachys pubescens as a raw material, cutting to a fixed length, removing a bamboo green layer and a bamboo yellow layer, opening bamboo joints, and performing inner circle milling and polishing on the inner surfaces of the bamboo joints; then longitudinally slitting the bamboo joints, soaking the bamboo joints by using alkali liquor, cleaning the bamboo joints after the treatment is finished, and performing high-temperature softening treatment by using high-temperature supersaturated steam;
s2, unfolding the bamboo joints subjected to high-temperature softening treatment, performing hot-pressing flattening to obtain flattened bamboo joints, and performing combined softening treatment on the flattened bamboo joints: the combined softening treatment mode is that microwave treatment is firstly carried out on flattened bamboo joints, high-temperature supersaturated steam is introduced after the treatment is finished, the operation is carried out for 2-3 times in a circulating way, secondary hot-pressing flattening is carried out after the operation is finished, and the thickness of single bamboo layers obtained by slicing is controlled to be 3-4 mm after the secondary hot-pressing flattening is finished; then hot air drying is carried out, so that the water content of the bamboo chips is reduced to below 8 percent and then the bamboo chips are taken out;
s3, carrying out vacuum impregnation treatment on the bamboo chips, assembling the bamboo chips in a vertically and horizontally overlapping mode after the impregnation treatment is finished, conveying the assembled blank materials into a forming device for hot press forming, discharging high-temperature steam in a die at the tail end of the hot press forming, continuously introducing low-temperature gas to quickly cool the blank materials, taking out the formed blank materials, and carrying out edge sawing, profiling and other manufacturing steps to obtain the finished bamboo sliding plate surface.
2. The method for forming the bamboo skateboard deck as claimed in claim 1, wherein the alkali solution used for soaking is NaOH or KOH solution with a mass fraction of 1-4 wt% at a temperature of 45-60 ℃ for 12-18 hours when the alkali solution soaking treatment is performed in step S1.
3. The method of claim 1, wherein the temperature of the high temperature supersaturated steam is 130 to 150 ℃, the steam pressure is 0.8 to 1.0MPa, and the duration of the high temperature treatment is 15 to 20min when the high temperature supersaturated steam is softened at a high temperature in the step S1.
4. The method for forming the bamboo skateboard deck as claimed in claim 1, wherein the hot pressing temperature is 70 to 90 ℃, the hot pressing pressure is 1.5 to 2.5MPa, and the hot pressing time is 2 to 3min when the hot pressing flattening is performed in step S2; and when the secondary hot pressing flattening is carried out, the hot pressing temperature is 70-90 ℃, the hot pressing pressure is 3-4 MPa, and the hot pressing time is 1-3 min.
5. The method as claimed in claim 1, wherein the microwave treatment is performed in step S2 by controlling the humidity of the microwave volume chamber to 70-80% and the microwave power to 650-700W for 15-30 min.
6. The method for forming the bamboo skateboard deck as claimed in claim 1, wherein the dipping glue used in the vacuum dipping treatment of the bamboo chips is epoxy resin glue or phenolic resin glue.
7. The method of claim 1, wherein the number of the bamboo layers is controlled to be 3 to 4 layers, and the bamboo fiber of the uppermost bamboo sheet among the 3 to 4 layers of bamboo sheets is parallel to the length direction of the board surface.
8. The method as claimed in claim 1, wherein a layer of sliced bamboo sheets is lined between adjacent bamboo sheets when the bamboo sheets are stacked and assembled, the sliced bamboo sheets have a thickness of 0.2-0.3 mm, and the bamboo fibers of the sliced bamboo sheets are parallel to the length direction of the skateboard surface.
9. The method for forming the bamboo skateboard deck as claimed in claim 1, wherein the hot press forming in step S3 is performed by controlling the hot press temperature to 120-130 ℃, pressing with a pressure of 4-6 Mpa, maintaining for 3-5 min, raising the hot press pressure to 12-15 Mpa, maintaining for 20-30 min, lowering the pressure surface temperature to 70-90 ℃, maintaining for 10min, continuously introducing low temperature gas, rapidly cooling the blank to room temperature, maintaining for 3-5 min, and then releasing pressure to perform the subsequent trimming and profiling operations.
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| CN202211187956.8A CN115476417A (en) | 2022-09-28 | 2022-09-28 | Method for forming bamboo skateboard surface |
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Application publication date: 20221216 |