CN107009450A - A kind of method that High frequency heating legal system makes recombinant decorative material - Google Patents
A kind of method that High frequency heating legal system makes recombinant decorative material Download PDFInfo
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- CN107009450A CN107009450A CN201710297855.9A CN201710297855A CN107009450A CN 107009450 A CN107009450 A CN 107009450A CN 201710297855 A CN201710297855 A CN 201710297855A CN 107009450 A CN107009450 A CN 107009450A
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- high frequency
- decorative material
- recombinant decorative
- slab
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Classifications
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- 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
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- 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
- 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
- B27K5/02—Staining or dyeing wood; Bleaching wood
-
- 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
- B27K5/04—Combined bleaching or impregnating and drying of wood
Abstract
The invention provides the method that High frequency heating legal system makes recombinant decorative material, comprise the following steps：(1) log removed the peel, rotary-cut, be cut into veneer A；(2) after veneer A is sorted, bleached, dyed, drying process, obtain board B；(3) board B is obtained into slab through digging, combination, double spread and assembly；(4) two slabs after assembly are placed between the upper and lower pressing plate of hot press with high frequency.(5) radio-frequency generator is opened, press is closed after energization preheated metallic plate, when being depressed into the time of pressing cycle 1/2 ~ 2/3, press is closed, and continue to heat after exchanging above and below two recombinant decorative material slab positions between pressing plate until completing the time of whole pressing cycle, pressing cycle is 4 ~ 6h.(6) taken out after film, distribution release are dismantled in slab cooling, carry out square-cut.Preparation method technique provided by the present invention is simple, production efficiency is high, and product bonding quality is good, and adhesive curing degree is uniform.
Description
Technical field
The invention belongs to wood processing technique field, and in particular to a kind of utilization High frequency heating legal system makes recombinant decorative material
Method.
Background technology
Recombinant decorative material be with the assortment such as linden, poplar, A Yousi veneer through bleachinging and dyeing, lamination, molding, the work such as glue molding
Skill is prepared from.In its gluing technique, Some Domestic producer uses conventional thermocompression mode, such as Patent No.
A kind of use pressure 8.0MPa, 145 DEG C of temperature, time 1.8min/mm heat pressing process are described in ZL200810104284.3
30cm recombinant decorative materials are prepared, but in production application, according to this heat pressing process, product thickness can be by serious
Limitation, this is due to that the heat transfer of conventional contact hot pressing is from outward appearance to inner essence, and recombinant decorative material slab thickness at least exists
There is thousands of layers of glue-line between more than 600mm, and slab, pipeline is very long, be also easy to produce slab top layer over-curing, sandwich layer but also
Uncured complete phenomenon, causes the Density inhomogeneity of flitch table, sandwich layer, and face ply moisture content is too low, influences follow-up
Slicing quality.
For reduction energy consumption, it is ensured that bonding quality, most of producers still by Cold-press adhesion mode Prepare restructuring decoration material,
As Patent No. ZL201410835789.2 describes a kind of Recombinant Wood flitch cold pressing forming process, i.e. pressure for 9 ~ 11MPa, week
Phase is 5 ~ 7 days, but cold pressing pressure general 15 ~ 18 MPa, even up to more than 20MPa in actual production, in normal temperature high voltage condition
Under, wood cell is easily damaged by conquassation in slab, and slab can be made the phenomenons such as fiber tearing, interlayer faults, this technique occur
It is higher to the performance requirement of adhesive, and hardening time is long, not only causes the waste of raw material, and low production efficiency, cost
It is higher.
High-frequency heating is with its homogeneous heating, rapid and have the advantages that selectivity, by more and more in wood industry
Concern.The one kind proposed in patent No. ZL201410164118.8 is added using fast-growing timber beam as raw material, using high-frequency microwave
Heat production recombinant material, hot pressing time only 12min substantially increases production efficiency, but the patented method Shortcomings：Due to pressure
Machine plate face temperature is low, so that the rise of slab skin temperature is influenceed, while the heat produced in heating process in slab can be shifted to
Top layer, to the cold afterwards formed Water vapor condensation in steel slab surface and pressing plate, cause slab top layer adhesive solidify not exclusively,
Surface is not only wet but also soft, influences bonding strength, is asked if assembling excessive vapor on pressing plate and can produce sparking, slab and puncture to burn etc.
Topic, threatens personal safety.
The content of the invention
The present invention makes weight for problem present in current recombinant decorative material gluing technique there is provided a kind of High frequency heating legal system
The method for assembling decoration materials.Preparation method technique provided by the present invention is simple, production efficiency is high, and product bonding quality is good.For
Above-mentioned purpose is realized, the present invention is achieved by the following technical programs：
A kind of method that High frequency heating legal system makes recombinant decorative material, comprises the following steps：
(1) log is removed the peel, the thick veneer As of 0.4 ~ 2.0mm are made in rotary-cut, cutting；
(2) by the veneer A obtained by step (1) it is sorted after, bleached, dyed, drying process, obtain moisture content for 6~
16% board B；
(3) board B for obtaining step (2) carries out digging, combination, double spread according to design requirements such as product texture, color and lusters
Slab is obtained with assembly, the adhesive of the gluing is Lauxite or cyanurotriamide modified urea resin, applying during gluing
Glue amount is 200~300g/m2.The more general heat pressing process of resin added it is many, during High frequency heating, hydrone and gluing in slab
Agent molecule is acted on by high-frequency electric field and rotates at a high speed and vibrate therewith, so that severe friction and collision are produced, slab internal material
Dielectric loss sharply increase, moment produces many heats；Increase resin added, so as to increase mat moisture content, improve heating speed
Degree.
(4) by two slabs after assembly in step (3) together with its each mould fix, and after being wrapped up with film,
Stacking is placed between the top board of hot press with high frequency and lower platen.
(5) open and press is closed after radio-frequency generator, 5 ~ 10min of energization preheated metallic plate, pressing cycle is 4 ~ 6h, when
When being depressed into the time of pressing cycle 1/2 ~ 2/3, press is closed, and will be exchanged between pressing plate above and below two recombinant decorative material slab positions
Continue to heat until completing the time of whole pressing cycle afterwards.
(6) after hot pressing terminates, decoration material slab to be reorganized be cooled to after room temperature take out, film of dismantling, after substep release,
Square-cut is carried out, recombinant decorative material flitch is made.
Preferably, the log described in step (1) is linden, A Yousi or poplar.
Veneer assembly notices that the elastic face of every layer of veneer is consistent, eliminated according to " pine is to loosening, tighten to tight " principle in step (3)
Stress deformation difference after adhesive solidification inside slab.
Slab described in step (4) is to be fixed together by two blocks of smooth steel plates with screw rod with mould, by spiral shell
The degree of tightening of bar directly applies pressure, and pressure is 8 ~ 15MPa；Described film can be polyethylene, polypropylene, polyphenyl second
Alkene or other resin materials.
Hot press with high frequency working frequency described in step (5) is 6.78MHz, and grid current is 0.3~0.5A, anode electricity
Flow for 1.2~2.5A.During High frequency heating, electric-field intensity can change as slab thickness changes, and be proof load matching,
The ratio of the grid current and anode current is 1:4~1:5.
It is further preferred that when log is linden, the grid current is 0.3~0.4A, anode current is 1.2 ~ 2.0A；Work as original
For poplar or Ah You at this moment, the grid current is 0.4 ~ 0.5A to wood, and anode current is 1.6 ~ 2.5A.In actual production, voltage
It is usually fixed constant, due to there is grease in linden, resistance compared with poplar, A Yousi more greatly, is ensureing same electric field intensity
In the case of, it can suitably reduce size of current.
Preferably, be equipped between the upper and lower pressing plate and slab of hot press with high frequency described in step (5) one layer 10 ~
Insulated thermal insulating layer thick 20cm.Described insulated thermal insulating layer using phenolic sheet or epoxy resin fiberglass layer pressing plate or
Person's polyfluortetraethylene plate.If directly being contacted with pole plate with the stainless steel plate that slab is fixed, there is the potential safety hazard of electric leakage, and due to
Steel slab surface temperature is relatively low, and vapor can condense on stainless steel to the cold, produce sparking, punch-through, threaten production
On the one hand personal security, insulated thermal insulating layer is to avoid security incident, is on the other hand in order to the heat loss of slab is reduced to most
It is small, improve production efficiency.
When being exchanged in step (5) above and below two boards base, slab is not overturn itself.
Distribution release described in step (6) be every 2 ~ 3min releases once, every time reduction by 1 ~ 3MPa of pressure, until pressure
Power is down to 0.Be distributed release partly in order to eliminate due to after adhesive solidification with veneer shrinkage degree difference inside slab
The internal stress of generation；On the other hand be in order to ensure slab thickness in the range of tolerance because after film of dismantling, with
Vapor is largely discharged, and the vapour pressure ratio ambient pressure inside slab is higher by a lot, and slab thickness has certain resilience.
Beneficial effects of the present invention are：
（1）According to high-frequency heating process characteristic, each several part is heated simultaneously inside slab, and adhesive curing degree is uniform, required
Hot pressing pressure is smaller compared to general gluing technique, and vapor is constantly moved from inside to outside in hot pressing, and slab is through too high
After warm boiling after-tack, the textured pattern of nature transition can be formed in mold process, molding quality is improved.
（2）The High frequency heating cycle is short, by increasing resin added, improves the rate of heat addition, hot pressing time only needs 4 ~ 6h, once may be used
2 recombinant decorative material flitches of machine-shaping, without another increase veneer maintenance process, production efficiency is high.
（3）At the 1/2 ~ 2/3 of pressing cycle, two boards base upper-lower position is exchanged, i.e., by temperature in high-frequency electric field most
After low area is exchanged with highest zone position, by reheating, by the adhesive completion of cure on the former top layer of every block of slab, it is to avoid
Because top layer adhesive solidifies incomplete problem caused by slab skin temperature is relatively low.
（4）Thin film is wrapped up outside slab and mould, vapor during High frequency heating is locked in around slab,
Slow down the curing rate of adhesive, it is to avoid slab sandwich layer is hardened, become fragile caused by adhesive solidification is too fast, so as to influence follow-up
The quality of recombinant decorative veneer in slicing processing；Meanwhile, after slab glue molding, boiling flitch, one are continued using vapor
Aspect can continue regulation flitch each several part moisture content to uniform and stable, on the other hand can soften flitch, improve slicing quality.
（5）One layer of insulated thermal insulating layer is respectively set in upper and lower pole plate, heat loss in hot pressing is substantially reduced, keeps away simultaneously
The stainless steel plate for exempting to fix slab and mould is directly contacted with pole plate, the electric leakage that causes, is struck sparks and is punctured the safe thing such as slab
Therefore.
Embodiment
The present invention is described in further detail with reference to embodiments.
This specific embodiment is only explanation of the invention, and it is not limitation of the present invention, people in the art
Member can make the modification without creative contribution to the present embodiment as needed after this specification is read, but as long as at this
All protected in the right of invention by Patent Law.
Embodiment 1
A kind of method that High frequency heating legal system makes recombinant decorative material, comprises the following steps：
(1) the thick veneer As of 0.5mm are made in the peeling of A Yousi logs, rotary-cut, cutting；
(2) by the veneer A obtained by step (1) it is sorted after, bleached, dyed, drying process, it is 10% to obtain moisture content
Board B；
(3) board B for obtaining step (2) carries out digging, combination, double spread according to design requirements such as product texture, color and lusters
Slab is obtained with assembly, the adhesive of the gluing is Lauxite, resin added during gluing is 240g/m2；
(4) by two slabs after assembly in step (3) together with its each mould fix, pressure is 9MPa, and uses poly- second
After alkene film parcel, stacking is placed between the top board of hot press with high frequency and lower platen；
(5) radio-frequency generator is opened, press is closed after energization preheated metallic plate 8min, after pressing cycle is 6h, hot pressing 3h, closed
Press is closed, and will continue to heat 3h after exchange above and below two recombinant decorative material slab positions between pressing plate；Described hot press with high frequency
Working frequency is 6.78MHz, and grid current is 0.4A, and anode current is 1.7A.
(6) after hot pressing terminates, taken out after slab is cooled to room temperature, film of dismantling, distribution release, carry out square-cut,
Recombinant decorative material flitch is made.
The physicochemical property of recombinant decorative material is as follows：
Without any appearance quality；
MOR：min 35.3MPa；max47.8MPa
Modulus of elasticity：min 3260MPa；max3740MPa
Nail-holding ability：
Parallel min 1140N；max1430N
Vertical min 710N；max1020N
End face min 700N；max980N
Dipping and stripping rate：0%
Whole moisture content：22~28%
Embodiment 2
A kind of method that High frequency heating legal system makes recombinant decorative material, comprises the following steps：
(1) the thick veneer As of 0.4mm are made in the peeling of linden log, rotary-cut, cutting；
(2) by the veneer A obtained by step (1) it is sorted after, bleached, dyed, drying process, it is 6% to obtain moisture content
Board B；
(3) board B for obtaining step (2) carries out digging, combination, double spread according to design requirements such as product texture, color and lusters
Slab is obtained with assembly, the adhesive of the gluing is Lauxite, resin added during gluing is 200g/m2；
(4) by two slabs after assembly in step (3) together with its each mould fix, and wrapped up with polypropylene film
Afterwards, stack and be placed between the top board of hot press with high frequency and lower platen, open radio-frequency generator, energization preheated metallic plate
Close press after 10min, pressing cycle is 5h, after hot pressing 3 hours, close press, and by two recombinant decorative material plates between pressing plate
Continue to heat 2h after exchanging above and below base position；Described hot press with high frequency working frequency is 6.5MHz, and grid current is 0.3A, screen
Electrode current is 1.5A.
(5) press is closed after opening radio-frequency generator, energization preheated metallic plate 8min, pressing cycle is 6h, hot pressing 3h
Afterwards, press is closed, and will continue to heat 3h after exchange above and below two recombinant decorative material slab positions between pressing plate；Described high frequency heat
Compressor operation frequency is 6.78MHz, and grid current is 0.4A, and anode current is 1.7A.
(6) after hot pressing terminates, taken out after slab is cooled to room temperature, film of dismantling, distribution release, carry out square-cut,
Recombinant decorative material flitch is made.
The physicochemical property of recombinant decorative material is as follows：
Without any appearance quality；
MOR：min 34.3MPa；max48.2MPa
Modulus of elasticity：min 3320MPa；max3680MPa
Nail-holding ability：
Parallel min 1152N；max1488N
Vertical min 705N；max1035N
End face min 703N；max978N
Dipping and stripping rate：0%
Whole moisture content：22~25%
Embodiment 3
A kind of method that High frequency heating legal system makes recombinant decorative material, comprises the following steps：
(1) the thick veneer As of 0.8mm are made in the peeling of poplar log, rotary-cut, cutting；
(2) by the veneer A obtained by step (1) it is sorted after, bleached, dyed, drying process, it is 16% to obtain moisture content
Board B；
(3) board B for obtaining step (2) carries out digging, combination, double spread according to design requirements such as product texture, color and lusters
Slab is obtained with assembly, the adhesive of the gluing is Lauxite, resin added during gluing is 300g/m2；
(4) by two slabs after assembly in step (3) together with its each mould fix, and wrapped up with polypropylene film
Afterwards, stack and be placed between the top board of hot press with high frequency and lower platen, open radio-frequency generator, energization preheated metallic plate 5min
After close press, pressing cycle is 4h, after hot pressing 2.5 hours, closes press, and by two recombinant decorative material slab positions between pressing plate
Put and continue to heat 1.5h after exchanging up and down；Described hot press with high frequency working frequency is 7MHz, and grid current is 0.5A, anode electricity
Flow for 1.6A.
(5) press is closed after opening radio-frequency generator, energization preheated metallic plate 8min, pressing cycle is 6h, hot pressing 3h
Afterwards, press is closed, and will continue to heat 3h after exchange above and below two recombinant decorative material slab positions between pressing plate；Described high frequency heat
Compressor operation frequency is 6.78MHz, and grid current is 0.4A, and anode current is 1.7A.
(6) after hot pressing terminates, taken out after slab is cooled to room temperature, film of dismantling, distribution release, carry out square-cut,
Recombinant decorative material flitch is made.
In the present embodiment, the bleaching described in step (2) is alkalescence-acid combined treatment process, concrete operation method
For：
Veneer A is placed in sodium hydroxide or urea, 3 ~ 4h is handled, veneer A is first placed on to pH value is for 9 ~ 11, mass concentration
In 6 ~ 8% hydrogen peroxide solution, temperature in Bellmer is slowly uniformly heating to 90 DEG C, 2 ~ 3h of isothermal holding；Veneer A is taken again
Go out after being rinsed with water, it is to handle 2h in the liquor natrii hypochloritis that 4 ~ 6, mass concentration is 2 ~ 4% to be placed on pH value.
In the present embodiment, the dyeing described in step (2) is using the different acid dyes of color and luster, and dye liquor temperature is 80
DEG C, dyeing time is 4h.
The physicochemical property of recombinant decorative material is as follows：
Without any appearance quality；
MOR：min 35.6MPa；max46.4MPa
Modulus of elasticity：min 3302MPa；max3648MPa
Nail-holding ability：
Parallel min 1186N；max1452N
Vertical min 678N；max1008N
End face min 653N；max972N
Dipping and stripping rate：0%
Whole moisture content：22~27%
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Any modifications, equivalent substitutions and improvements made within principle etc., should be included in the scope of the protection.
Claims (8)
1. a kind of method that High frequency heating legal system makes recombinant decorative material, it is characterised in that the preparation method comprises the following steps：
(1) log is removed the peel, the thick veneer As of 0.4 ~ 2mm are made in rotary-cut, cutting；
(2) by the veneer A obtained by step (1) it is sorted after, bleached, dyed, drying process, obtain moisture content for 6~
16% board B；
(3) board B for obtaining step (2) carries out digging, combination, double spread according to design requirements such as product texture, color and lusters
Slab is obtained with assembly, the adhesive of the gluing is Lauxite or cyanurotriamide modified urea resin, applying during gluing
Glue amount is 200~350g/m2；
(4) by two slabs after assembly in step (3) together with its each mould fix, and after being wrapped up with film, stack
It is placed between the top board of hot press with high frequency and lower platen；
(5) radio-frequency generator is opened, press is closed after 5 ~ 10min of energization preheated metallic plate, pressing cycle is 4 ~ 6h, when being depressed into
During the time of pressing cycle 1/2 ~ 2/3, press is closed, and will exchange follow-up above and below two recombinant decorative material slab positions between pressing plate
Continuous heating is until complete the time of whole pressing cycle；
(6) after hot pressing terminates, taken out after slab is cooled to room temperature, film of dismantling, distribution release, carry out square-cut, be made
Recombinant decorative material flitch.
2. the method that High frequency heating legal system as claimed in claim 1 makes recombinant decorative material, it is characterised in that institute in step (1)
The log stated is linden, A Yousi or poplar.
3. the method that High frequency heating legal system as claimed in claim 1 makes recombinant decorative material, it is characterised in that institute in step (3)
Resin added when stating gluing is 200~350g/m2。
4. the method High frequency heating legal system as claimed in claim 1 that High frequency heating legal system makes recombinant decorative material makes recombinant decorative material
Method, it is characterised in that film described in step (4) is polyethylene, polypropylene or polystyrene.
5. the method that High frequency heating legal system as claimed in claim 1 makes recombinant decorative material, it is characterised in that institute in step (5)
The hot press with high frequency working frequency stated is 6.78MHz, and grid current is 0.3~0.5A, and anode current is 1.2~2.0A, described
The ratio of grid current and anode current is 1:4~5.
6. the method that High frequency heating legal system as claimed in claim 5 makes recombinant decorative material, it is characterised in that when log is linden
When, the grid current is 0.3~0.4A, and anode current is 1.4 ~ 1.6A；When log be poplar or Ah You at this moment, the grid
Electric current is 0.4 ~ 0.5A, and anode current is 1.6 ~ 1.8A.
7. the method that High frequency heating legal system as claimed in claim 1 makes recombinant decorative material, it is characterised in that institute in step (5)
The thick insulated thermal insulating layers of one layer of 10 ~ 20cm are equipped between the upper and lower pressing plate and slab of the hot press with high frequency stated；It is described insulation every
Thermosphere be wooden plywood,.
8. the method that High frequency heating legal system as claimed in claim 1 makes recombinant decorative material, it is characterised in that institute in step (6)
The distribution release concrete operation method stated is once, reduces by 1 ~ 3MPa of pressure every time every 2 ~ 3min releases, until pressure is down to
0。
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| CN108748560A (en) * | 2018-05-31 | 2018-11-06 | 阜南县明强柳编工艺品有限公司 | A kind of softening colouring method of soybean stalk |
| CN108839160A (en) * | 2018-05-29 | 2018-11-20 | 浙江农林大学 | A kind of hydro-thermal process bamboo matter powder moulds the preparation method of closely knit material without rubber moulding |
| CN109333692A (en) * | 2018-09-20 | 2019-02-15 | 德华兔宝宝装饰新材股份有限公司 | A kind of method that plasma modification height emulates scientific and technological wood skin |
| CN110253706A (en) * | 2019-06-17 | 2019-09-20 | 北京中竹文化科技有限公司 | A kind for the treatment of process of bamboo wood fungus-proof antisepsis |
| CN114147821A (en) * | 2021-12-06 | 2022-03-08 | 德华兔宝宝装饰新材股份有限公司 | Preparation method of aldehyde-free recombined decorative veneer |
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