AU2020104286A4 - Method for determining treatment conditions and evaluating treatment effect of wood block for veneer cutting - Google Patents
Method for determining treatment conditions and evaluating treatment effect of wood block for veneer cutting Download PDFInfo
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- 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
- B27K5/0005—Cryogenic treatment
-
- 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
- B27K1/00—Damping 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
- B27K5/001—Heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
-
- 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
- B27K2200/00—Wooden materials to be treated
- B27K2200/10—Articles made of particles or fibres consisting of wood or other lignocellulosic material
Abstract
The present invention discloses a method for determining treatment conditions and
evaluating a treatment effect of a wood block for veneer cutting, including the following
steps of: manufacturing a test part, first selecting raw wood with an average water
content of over 80 percent to manufacture the test part, manufacturing the wood into
a hardness test part, performing water soaking and saturation treatment to prepare a
water-saturated test part; measuring hardness of a cross section, a tangential section
and a radial section of the wood; manufacturing a rift grain shear strength test part,
and then performing water soaking and saturation treatment to prepare the water
saturated test part; selecting a treatment method according to wood density
characteristics; determining a treatment temperature according to parameters
obtained through treatment, and finally determining treatment time; and then obtaining
wood treatment parameter data so as to directly obtain an evaluation effect. An
anisotropism of the wood can be improved according to density characteristics of the
wood by adopting a classification treatment mode; proper wood treatment conditions
are directly selected through the parameters, so that many influence factors in the
aspects of mechanical equipment precision, adjustment errors, cutting parameters
and a cutter in indirect selection of the treatment conditions can be avoided, and the
cutting quality of veneers and thin wood can be improved.
Description
The present invention relates to the field of wood treatment, and more
specifically to a method for determining treatment conditions and evaluating a
treatment effect of a wood block for veneer cutting.
Wood is an anisotropic material, and anisotropy is mainly reflected in three
section directions of a cross section, a tangential section and a radial section.
From the perspective of veneer cutting (slicing, peeling), the properties of three
or two section directions are similar, the anisotropy of the wood can be reduced,
thereby improving the cutting performance of the wood. Therefore, treatment
wood can improve the cutting performance of the wood to a certain extent.
Currently, veneer (a thin wood) cutting is mainly treated with wood block
(in the production of plywood, a certain length of logs or wood squares used for
cutting veneer is called the wood block) such as a hydrothermal treatment
method (soaking, cooking). For low-density wood, if the treatment effect is not
good or not treated, this will affect the quality of a veneer. Therefore, it is
necessary to choose different treatment methods according to the
characteristics of the wood. In addition, an indirect method is used to measure
and evaluate the effect of treatment quality. That is, the performance of the cut veneer (the thin wood) is measured to evaluate the treatment conditions of the wood block, and the appropriate treatment conditions are selected. However, the treatment process of the veneer cutting contains many other influencing factors such as cutting parameters, conditions of a cutter, accuracy and adjustment of a machine tool, etc., and cannot accurately evaluate the treatment method of the wood to improve effects. For example, through experiments, it is found that a sharpness of the cutter has a significant impact on cutting quality. The experiment shows that the minimum cutting thickness is about 0.06mm when the sharpness of a cutting edge is 0.3m; when the sharpness of the cutting edge is 2m, the minimum cutting thickness is about
0.2mm. At present, the sharpness of the cutting edge of a domestic veneer
cutter is difficult to reach 2m or less, which affects the cutting quality of the
veneer. For the above problems, the individual or combined effects of these
factors are always unavoidable.
Finally, because of the inaccurate evaluation and determination of the
treatment effect of the wood block, energy, manpower and material resources
are wasted, which affects the quality of the veneer (the thin wood) and the
benefit of the enterprises.
Therefore, in order to improve the quality of the veneer (the thin wood),
reduce the energy, manpower and material resources required for wood block
treatment, it is necessary to study the classification treatment method and the
direct evaluation method of treatment effects according to the characteristics of
the wood itself, so as to determine the best treatment conditions.
The object of the present invention is to provide a method for determining
treatment conditions and evaluating a treatment effect of a wood block for
veneer cutting, so as to solve the technical problems mentioned in the technical
background.
A method for determining treatment conditions and evaluating a treatment
effect of a wood block for veneer cutting includes the following steps:
s1: manufacturing a test part, selecting raw wood with an average water
content of over 80 percent to manufacture the test part; manufacturing a
hardness test part, and then performing water soaking and saturation treatment
to prepare a water-saturated test part with reference to GB/T1929-2009
measuring hardness of a cross section, a tangential section and a radial section
of the wood with reference to GB/T1941-2009 "METHOD OF TESTING IN
HARDNESS OF WOOD"; manufacturing a rift grain shear strength test part,
and then performing water soaking and saturation treatment to prepare the
water-saturated test part with reference to Japanese Industrial Standards
JISZ2101-1994 "SHEAR TEST OF WOOD TEST METHOD (8)".
s2: selecting a treatment method according to density characteristics of the
wood;
According to available data, a density of the corresponding type of wood is
determined or the density of the wood is measured. The wood is divided into
low-density wood and high-density wood. Under the balance treatment
conditions, the wood with a density of 0.5g/cm 3 or less is called the low density wood, and the wood with a density of 0.5g/cm 3 or above is called the high density wood.
For the wood with a density of over 0.5g/cm 3 , a hydrothermal treatment
method is selected, to perform hydrothermal treatment. The relevant
parameters are calculated according to the following definition requirements:
A percentage of a treated cross-section national standard (GB) hardness
value (Hh) to a cross-section hardness value (hSh) of the water-saturated test
part is called a cross-section hardness reduction rate (Jh), as shown in the
following formula 1.
Jl,= ( HI, /HS,) x 100%
A percentage of a treated chord-section national standard (GB) hardness
value (Hz) to a chord-section hardness value (hsx) of the water-saturated test
part is called a chord-section hardness reduction rate (Jx), as shown in the
following formula 2.
J, =(Hr /HS.) x 100%
A percentage of a treated radial section national standard (GB) hardness
value (Hj) to a radial section hardness value (hsx) of the water-saturated test
part is called a radial-section hardness reduction rate (J), as shown in the
following formula 3.
IH (3)
A percentage of the treated chord-section hardness value (Hz) to the cross- section national standard (GB) hardness value (Hh) is called a cross section softening rate (Rh), as shown in formula 4 below
Rh= ( H /H,) x 100% (4)
A percentage of the treated radial-section national standard (GB) hardness
value (Hj) to the chord-section hardness value (Hz) is called a chord-section
softening rate (Rx), as shown in the following formula 5
-R,=(Hj/H, )X 100%(5 (5)
A percentage of a treated shear strength value (Qc) to a shear strength
value (Qs) of the water-saturated test part is called a shear strength reduction
rate (K), as shown in formula 6
Kj=(QIQ) X100% (6)
In a case of the hydrothermal treatment, refer to the following
corresponding values: the cross-section hardness reduction rate is about 76%,
the chord-section hardness reduction rate the radial-section hardness reduction
rate are about 81%; the cross-section softening rate is about 96%, the chord
section softening rate is about 95%, and the shear strength reduction rate is
about 90%.
For the raw wood with the density of less 0.5g/cm 3 , freezing treatment is
performed (the raw wood is frozen at different temperatures and different time),
the relevant parameters are calculated according to the following definition
requirements: a percentage of the treated cross-section hardness value (Hh) to
the cross-section hardness value (hsx) of the water-saturated test part is called a cross-section hardness increase rate (Zh), as shown in formula 7.
Z ( I= HI, HS. ) x 100% (7)
A percentage of the treated chord-section hardness value (Hz) to the chord
section hardness value (hsx) of the water-saturated test part is called a chord
section hardness increase rate (Zx), as shown in formula 8
Z, =(H. /HS, ) x 100% (8)
A percentage of the treated radial-section hardness value (Hj) to the radial
section hardness value (hsj) of the water-saturated test part is called a radial
section hardness increase rate (Z), as shown in formula 9
Zj= ( Hg /HSJ ) X 100% (9)
A percentage of the treated chord-section hardness value (Hz) to the cross
section hardness value (Hh) is called a cross-section hardness change rate (Yh),
as shown in formula 10
Y'I HT, /H ) X 100% (10)
A percentage of the treated radial-section hardness value (Hj) to the chord
section hardness value (Hz) is called the chord-section hardness change rate
(Yx), as shown in formula 11
Y,= Hj /H,) x 100% (1
The percentage of the treated shear strength value (Qc) and the shear
strength value of the water-saturated (Qs) is called a shear strength increase rate (Kz), as shown in formula (12)
K,=(Q'IQ,) X 100% (12)
In a case of freezing treatment, refer to the following corresponding values:
for hardness increase rates of three sections, when the cross-section hardness
increase rate is about 109%, the chord-section hardness increase rate is about
115%, the radial-section hardness increase rate is about 121%; the chord
section hardness change rate is about 96%; the chord-section hardness
change rate is about 98%, and the shear strength increase rate is about 111%,
there is the best treatment temperature;
S3: determining the treatment temperature.
The corresponding treatment parameters are calculated according to the
above definition formula to determine the treatment temperature of the
corresponding wood;
S4: determining the treatment time.
The treatment time is determined according to the radius of the specific
wood block, and the treatment time is determined by the hardness change rate
of the hydrothermal treatment and the hardness change rate of the freezing
treatment;
During the hydrothermal treatment of the wood block, the time when the
cross-section hardness reduction rate from the outer surface of the wood block
to a pith heart center (hardness of a sapwood and a core material is measured,
respectively) reaches a value calculated by formula (1) is selected as the treatment time, a ratio of a radius (Ro) of the wood block to the required time
(Ti) is called a hardness change rate ( Yi) of the hydrothermal treatment;
as shown in formula 13
YBW = ( R, / Tid) (13)
During the freezing treatment of the wood block, the time when the cross
section hardness increase rate from the outer surface of the wood block to a
pith heart center (the hardness of the sapwood and the core material is
measured, respectively) reaches a value calculated by formula (7) is selected
as the treatment time, a ratio of the radius (Ro) of the wood block to the required
time (td) is called the freezing treatment hardness change rate (YBld); as
shown in formula 14
YB= ( R /TI) (14)
The parameters obtained through the above series of experiments and
calculations determine the treatment conditions (such as treatment temperature,
treatment time) and the treatment effect of the properties of the corresponding
wood to make an accurate evaluation.
The beneficial effects of the present invention are as follows:
1. According to the characteristics of the wood, the anisotropy of the wood
is improved. A classification treatment method is used. For example, the wood
with the low density (the density less than 0.5g/cm 3 ) uses freezing treatment.
The wood with the relative high density (the density is higher than 0.5g/cm 3 )
uses the hydrothermal treatment. The classification treatment can effectively improve the quality of the veneer (the thin wood).
2. The direct evaluation method can avoid the influence of a plurality of
mechanical equipment, cutting parameters and the cutter. The treatment effect
of the wood itself is evaluated, which is conducive to the accurate determination
of wood treatment conditions, saves energy, manpower and material resources
for wood treatment, reduces production costs and can improve corporate
efficiency.
The technical solutions in the embodiments of the present invention will be
clearly and completely described below in conjunction with the embodiments of
the present invention. Obviously, the described embodiments are only a part of
the embodiments of the present invention, rather than all the embodiments.
In the present invention, the various properties of wood are affected by
moisture content. Therefore, in national standard, the state where the moisture
content reaches 12% after treatment is defined as a measurement standard
state. This treatment process is called equilibrium treatment. The determination
and classification of wood density are carried out after balancing treatment.
Embodiment 1
A treatment method for high-density wood
s1: manufacturing a test part, wherein poplar wood with a tree age of 24
32 years and a diameter between 235-310mm is used, and an average
moisture content of raw wood is 89%;
Raw wood with an average water content of 89 percent is selected to
manufacture the test part. A hardness test part is manufactured, and then water
soaking and saturation treatment are performed to prepare a water-saturated
test part with reference to national standard GB/T1929-2009 "METHOD OF
PHYSICAL AND MECHANICAL TESTS OF WOOD". Hardness of a cross
section, a tangential section and a radial section of the wood is measured with
reference to national standard GB/T1941-2009 "METHOD OF TESTING IN
HARDNESS OF WOOD". A rift grain shear strength test part is manufactured,
and then water soaking and saturation treatment are performed to prepare the
water-saturated test part with reference to Japanese Industrial Standards
JISZ2101-1994 "SHEAR TEST OF WOOD TEST METHOD (8)".
For the wood with a density of over 0.5g/cm 3 , a hydrothermal treatment
method is selected, to perform hydrothermal treatment. The relevant
parameters are calculated according to the following definition requirements: a
plurality of groups of different soaking temperature and treatment time
conditions (for example, the treatment temperature is 40°C, 50°C, 60°C, 70°C,
and 80°C; treatment time is 4h, 8h, 10h, 12h and the like) are set as a control
group for wood treatment.
A percentage of a treated chord-section national standard (GB) hardness
value (Hz) to a chord-section hardness value (hsx) of the water-saturated test
part is called a chord-section hardness reduction rate (J), as shown in the
following formula 2.
J.= (H IHS) X 100%(2)
A percentage of a treated radial section national standard (GB) hardness
value (Hj) to a radial section hardness value (hsx) of the water-saturated test
part is called a radial-section hardness reduction rate (J), as shown in the
following formula 3.
JJ= ( HJ/HSj) I I X100%(3 (3)
A percentage of the treated chord-section hardness value (Hz) to the cross
section national standard (GB) hardness value (Hh) is called a cross section
softening rate (Rh), as shown in formula 4 below.
R,= ( H, /HI,) X 100%(4
A percentage of the treated radial-section national standard (GB) hardness
value (Hj) to the chord-section hardness value (Hz) is called a chord-section
softening rate (Rx), as shown in the following formula 5.
,R,=( Hj/H, ) X 100% (5)
A percentage of a treated shear strength value (Qc) to a shear strength
value (Qs) of the water-saturated test part is called a shear strength reduction
rate (Kj), as shown in formula 6.
Kj=(Q,/IQ) X100% (6)
In a case of the hydrothermal treatment, refer to the following
corresponding values: the cross-section hardness reduction rate is about 76%, the chord-section hardness reduction rate the radial-section hardness reduction rate are about 81%; the cross-section softening rate is about 96%, the chord section softening rate is about 95%, and the shear strength reduction rate is about 90%.
S3, determining the treatment temperature.
The corresponding treatment parameters are calculated according to the
above definition formula to determine the treatment temperature of the
corresponding wood;
S4, determining the treatment time.
The treatment time is determined according to the radius of the specific
wood block, and the treatment time is determined by the hardness change rate
of the hydrothermal treatment and the hardness change rate of the freezing
treatment;
During the hydrothermal treatment of the wood block, the time when the
cross-section hardness reduction rate from the outer surface of the wood block
to a pith heart center (hardness of a sapwood and a core material is measured,
respectively) reaches a value calculated by formula (1) is selected as the
treatment time, a ratio of a radius (Ro) of the wood block to the required time
(TId) is called a hardness change rate ( ) of the hydrothermal treatment;
as shown in formula 13:
YB= 'T )(13)
Through the above series of experiments and calculations, it is determined
that the treatment conditions and the treatment effect of the properties of the
corresponding wood can be directly and accurately evaluated to determine the
best treatment conditions.
Embodiment 2
A treatment method of low-density wood
s1: manufacturing a test part,
Raw wood with a water content of over 80 percent to manufacture the test
part. A hardness test part is manufactured, and then water soaking and
saturation treatment are performed to prepare a water-saturated test part
specifically with reference to national standard GB/T1929-2009 "METHOD OF
PHYSICAL AND MECHANICAL TESTS OF WOOD". Hardness of a cross
section, a tangential section and a radial section of the wood is measured with
reference to national standard GB/T1941-2009 "METHOD OF TESTING IN
HARDNESS OF WOOD". A rift grain shear strength test part is manufactured,
and then water soaking and saturation treatment are performed to prepare the
water-saturated test part with reference to Japanese Industrial Standards
JISZ2101-1994 "SHEAR TEST OF WOOD TEST METHOD (8)".
s2. For the raw wood with the density of less 0.5g/cm3, freezing treatment
is performed. Related parameters are calculated according to the following
definition requirements (different groups of temperature and time conditions are
set for freezing treatment, such as -3°C, -6°C-, - 9°C, and -12 0C; treatment time is 4h, 8h, 10h, 12h and the like. Different control groups are frozen): a percentage of the treated cross-section hardness value (Hh) to the cross section hardness value (HSx) of the water-saturated test part is called a cross section hardness increase rate (Zh), as shown in formula 7.
Z= ( HIs HS,. ) x 100% (7)
A percentage of the treated chord-section hardness value (Hz) to the chord
section hardness value (hsx) of the water-saturated test part is called a chord
section hardness increase rate (Zx), as shown in formula 8
Z, =( H, /HS, ) x 100% 8
A percentage of the treated radial-section hardness value (Hj) to the radial
section hardness value (hsj) of the water-saturated test part is called a radial
section hardness increase rate (Z;), as shown in formula 9
Zj= ( H / HSJ ) X 100%(9
A percentage of the treated chord-section hardness value (Hz) to the cross
section hardness value (Hh) is called a cross-section hardness change rate (Yh),
as shown in formula 10
Yl,= ( H. /HI, ) X 100% (10)
A percentage of the treated radial-section hardness value (H) to the chord
section hardness value (Hz) is called the chord-section hardness change rate
(Yx), as shown in formula 11
T,= (H1:H, X(100% I')
The percentage of the treated shear strength value (Qc) and the shear
strength value of the water-saturated (Qs) is called a shear strength increase
rate (Kz), as shown in formula (12)
K,,=( Q./Q, ) X 100% (12)
In a case of freezing treatment, refer to the following corresponding values:
for hardness increase rates of three sections, when the cross-section hardness
increase rate is about 109%, the chord-section hardness increase rate is about
115%, the radial-section hardness increase rate is about 121%; the chord
section hardness change rate is about 96%; the chord-section hardness
change rate is about 98%, and the shear strength increase rate is about 111%,
there is the best treatment temperature.
S3: determine the treatment temperature.
The corresponding treatment parameters are calculated according to the
above definition formula to determine the treatment temperature of the wood;
S4: determining the treatment time.
The treatment time is determined according to the radius of the specific
wood block, and the treatment time is determined by the hardness change rate
of the hydrothermal treatment and the hardness change rate of the freezing
treatment;
During the freezing treatment of the wood block, the time when the cross
section hardness increase rate from the outer surface of the wood block to a pith heart center (the hardness of the sapwood and the core material is measured, respectively) reaches a value calculated by formula (7) is selected as the treatment time, a ratio of the radius (Ro) of the wood block to the required time (td) is called the freezing treatment hardness change rate (YBd); as shown in formula 14
TBI- (R, / TI)(14)
Through the above series of experiments and calculations, it is determined
that the treatment conditions and the treatment effect of the properties of the
corresponding wood can be directly and accurately evaluated. The reasonable
treatment conditions of the wood block is selected.
The foregoing are only preferred embodiments of the present invention,
but the protection scope of the present invention is not limited thereto. Any
equivalent replacements or changes made by a person of ordinary skill in the
art according to the technical solutions and conception within the technical
scope disclosed in the present invention should cover the protection scope of
the present invention.
Claims (3)
1. A method for determining treatment conditions of a wood block for
veneer cutting, characterized by comprising the following steps:
s1: manufacturing a test part, selecting raw wood with an average water
content of over 80 percent to manufacture the test part, manufacturing the wood
into a hardness test part, performing water soaking and saturation treatment to
prepare a water-saturated test part; measuring hardness of cross sections,
tangential sections and radial sections of the wood; manufacturing a rift grain
shear strength test part, and then performing water soaking and saturation
treatment to prepare the water-saturated test part;
s2. selecting a treatment method according to density characteristics of the
wood;
a density of the corresponding type of wood is determined according to
available data, the wood is divided into low-density wood and high-density wood,
under the above conditions, the wood with a density of 0.5g/cm3 or less is called
the low density wood, and the wood with a density of 0.5g/cm3 or above is
called the high density wood;
for the wood with a density of 0.5g/cm3 or more, a hydrothermal treatment
method is selected, a plurality of different treatment temperatures and different
treatment time at a certain interval are selected to perform hydrothermal
treatment; the relevant parameters are calculated according to the following
definition requirements:
a percentage of a treated cross-section national standard (GB)hardness value (Hh) to a cross-section hardness value (HSh) of the water-saturated test part is called a cross-section hardness reduction rate (Jh), as shown in the following formula 1.
JI= ( HI /,) X 100% (1)
a percentage of a treated chord-section national standard (GB) hardness
value (Hz) to a chord-section hardness value (HSx) of the water-saturated test
part is called a chord-section hardness reduction rate (Jx), as shown in the
following formula 2.
J HI/HS.) x 100% (2)
a percentage of a treated radial section national standard (GB) hardness
value (H) to a radial section hardness value (HSx) of the water-saturated test
part is called a radial-section hardness reduction rate (J), as shown in the
following formula 3.
Ji.= ( NJ /HSj ) X100%(3 I (3)
a percentage of the treated chord-section hardness value (Hz) to the cross
section national standard (GB) hardness value (Hh) is called a cross section
softening rate (Rh), as shown in formula 4 below
R= ( H. IHi) X100% (4)
a percentage of the treated radial-section national standard (GB) hardness
value (Hj) to the chord-section hardness value (Hz) is called a chord-section
softening rate (Rx), as shown in the following formula 5
_R1= H /H, )X 100% (5)
a percentage of a treated shear strength value (Qc) to a shear strength
value (Qs) of the water-saturated test part is called a shear strength reduction
rate (Kj), as shown in formula 6
K=(Q,/Q,) X100% (6)
In a case of the hydrothermal treatment, refer to the following
corresponding values: when the cross-section hardness reduction rate is about
76%, the chord-section hardness reduction rate the radial-section hardness
reduction rate are about 81%, the cross-section softening rate is about 96%,
the chord-section softening rate is about 95%, and the shear strength reduction
rate is about 90%, there is the best treatment temperature;
for the raw wood with the density of 0.5g/cm3 or less, the plurality of
different treatment temperatures and the plurality of treatment time at certain
intervals for freezing treatment are selected, the relevant parameters are
calculated according to the following definition requirements: a percentage of
the treated cross-section hardness value (Hh) to the cross-section hardness
value (HSx) of the water-saturated test part is called a cross-section hardness
increase rate (Zh), as shown in formula 7
Zh= ( H1, /HS, ) x 100% (7)
a percentage of the treated chord-section hardness value (Hz) to the chord
section hardness value (HSx) of the water-saturated test part is called a chord
section hardness increase rate (Zx), as shown in formula 8
Z, =(H. /HS ) X 100% (8)
a percentage of the treated radial-section hardness value (Hj) to the radial
section hardness value (HS;) of the water-saturated test part is called a radial
section hardness increase rate (Zj), as shown in formula 9
Z = ( H /HSJ ) X 100% (9)
a percentage of the treated chord-section hardness value (Hz) to the cross
section hardness value (Hh) is called a cross-section hardness change rate (Yh),
as shown in formula 10
Y ( 1=H, /H ) X 100% (10)
a percentage of the treated radial-section hardness value (H) to the chord
section hardness value (Hz) is called the chord-section hardness change rate
(Yx), as shown in formula 11
T,=( H /H, ) X 100%
The percentage of the treated shear strength value (Qc) and the shear
strength value of the water-saturated (Q,) is called a shear strength increase
rate (Kz), as shown in formula (12)
,=( Q,. /Q, ) X 100% (12)
in a case of freezing treatment, refer to the following corresponding values:
for hardness increase rates of three sections, when the cross-section hardness
increase rate is about 109%, the chord-section hardness increase rate is about
115%, the radial-section hardness increase rate is about 121%; the chord
section hardness change rate is about 96%; the chord-section hardness
change rate is about 98%, and the shear strength increase rate is about 111%,
there is the best treatment temperature;
s3: determining the treatment temperature,
the corresponding treatment parameters are calculated according to the
above definition formula to determine the treatment temperature of the wood;
s4, determining the treatment time,
the treatment time is determined according to the radius of the specific
wood block, and the treatment time is determined by the hardness change rate
of the hydrothermal treatment and the hardness change rate of the freezing
treatment;
during the hydrothermal treatment of the wood block, the time when the
cross-section hardness reduction rate from the outer surface of the wood block
to a pith heart center (hardness of a sapwood and a core material is measured,
respectively) reaches a value calculated by formula (1) is selected as the
treatment time, a ratio of a radius (Ro) of the wood block to the required time
(TId) is called a hardness change rate ( Yi) of the hydrothermal treatment;
as shown in formula 13
YBW ( P. /Td )(13)
during the freezing treatment of the wood block, the time when the cross
section hardness increase rate from the outer surface of the wood block to a pith heart center (the hardness of the sapwood and the core material is measured, respectively) reaches a value calculated by formula (7) is selected as the treatment time, a ratio of the radius (Ro) of the wood block to the required time (TId) is called the freezing treatment hardness change rate (YByd); as shown in formula 14
YBI- (R,.TId (14)
the wood of different densities is classified and treated through the above
parameter features, to obtain the directly treated parameter data.
2. The method for determining the treatment conditions of the wood block
for the veneer cutting according to claim 1, characterized in that the density
value of the wood can also be obtained by direct measurement.
3. A method for evaluating classification and treatment effects of a wood
block for veneer cutting, characterized in that various parameters of wood
treatment are determined through a series of experiments and calculations
according to claim 1; correspondingly, treatment conditions and a treatment
effect of corresponding wood performance can be directly evaluated accurately
to determine the best treatment conditions.
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| AU2020104286A AU2020104286A4 (en) | 2020-12-23 | 2020-12-23 | Method for determining treatment conditions and evaluating treatment effect of wood block for veneer cutting |
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| AU2020104286A AU2020104286A4 (en) | 2020-12-23 | 2020-12-23 | Method for determining treatment conditions and evaluating treatment effect of wood block for veneer cutting |
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| Publication Number | Publication Date |
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| Country | Link |
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