WO2016086656A1

WO2016086656A1 - Method for steaming during changing of softwood into hardwood

Info

Publication number: WO2016086656A1
Application number: PCT/CN2015/083153
Authority: WO
Inventors: 王凯
Original assignee: 王凯
Priority date: 2014-12-02
Filing date: 2015-07-02
Publication date: 2016-06-09
Also published as: JP6383097B2; CN104493936B; JP2017533113A; CN104493936A

Abstract

The present invention relates to a method for steaming during changing of a softwood into a hardwood; the method comprises: at a certain temperature, a certain pressure is applied to a softwood, and while steaming at intervals or continuously, high-temperature high-pressure treatment is performed; at a certain temperature, a certain pressure is applied to the high-temperature high-pressure treated softwood, and while steaming at intervals or continuously, continued pressure treatment is performed; by means of the above operation, the pit-shaped cells inside the softwood are changed so that they have a flattened structure; air, resin, tannin compounds, and other impurities are removed from the cells of the softwood at the same time, such that the processed softwood has the robust texture of a hardwood.

Description

Steaming method when cork compaction becomes hardwood

Technical field

The invention relates to a steaming method, in particular to a method for introducing steam when softwood is compacted into hardwood.

Background technique

Hardwood is hard and fine, with beautiful color and fine texture. It is a good material for furniture and wood products. However, due to its slow growth and fine wooden structure, it is very expensive. Cork is composed of many flat cells with radiation arrangement. The cell cavity often contains resin and tannin compounds. The cells are filled with air and are generally used for furniture and wood products or core materials. Because cork is soft and soft, with low strength and flexible defects, wood products manufacturers almost do not use cork to produce products such as furniture and wood products, and can only act as a supporting role for hardwood; but cork has a short growth cycle and its price ratio Hardwood is much cheaper and more affordable. Based on this, how to remove the air, resin and tannin compounds inside the cork, and change the soft wood softness, low density and low hardness are the technical problems that researchers need to solve urgently.

Summary of the invention

In order to solve the above technical problems and fully utilize the cork, the present invention studies an improvement of the softness of the softwood, and excludes the resin and the tannin compound in the softwood, so that it becomes a hardwood with high hardness, high wear resistance and high strength. In the method, the method is mainly a steaming method when the cork is compacted into a hardwood.

Technical solution

The specific technical solutions of the present invention are as follows:

The invention provides a steaming method for softwood compaction into hardwood, the method comprising the following steps:

a. High temperature and high pressure treatment: applying a certain pressure to the cork at a certain temperature, and performing high temperature and high pressure treatment under the condition of intermittent or continuous steam introduction;

b. Continuous pressure treatment: The cork after high temperature and high pressure treatment is applied with a certain pressure at a certain temperature, and the continuous pressure treatment is carried out under the condition of intermittent or continuous steam introduction.

In a further improved solution, the method of introducing steam into the hardwood when the cork is compacted comprises the following steps:

a. High temperature and high pressure treatment: the cork is applied at a temperature of 120-150 ° C, a pressure of 15-35 kg / cm ² , and high temperature and high pressure treatment under the condition of continuous or continuous steam, high temperature and high pressure treatment time is 3 -10min, the time of steaming is not greater than the time of high temperature and high pressure treatment;

b. Continuous pressure treatment: the cork after high temperature and high pressure treatment is applied at a temperature of 160-190 ° C, a pressure of 15-35 kg / cm ² , and continuous pressure treatment under the condition of continuous or continuous steaming, The time for the continuous pressure treatment is 4-10 min, and the time for introducing steam is not more than the time for the continuous pressure treatment.

The softwood referred to in the present invention is a softwood material such as pine, fir, eucalyptus, nanmu and eucalyptus.

The invention provides a steaming method by compacting softwood into hardwood. The method is simple in operation. The steaming method provided by the invention adopts two steam inlets, and the first is in the high temperature and high pressure processing process. In the process, the steam can be injected into the inner nest cells of the cork step by step without causing the cells in the cork to quickly dry and break, but the original air, resin and tannin compounds in the internal structure are uniformly discharged. Out; this ensures that the hardwood made is more uniform; the second steaming is in the process of continuous pressure, which ensures that the air and existing impurities in the cell tissue inside the cork are completely discharged; and the cork cell structure is affected. The external strong pressure and steam double factors make it into a linear strip shape; the high temperature steam is introduced while the pressure is applied, so that the cork is wetted while being wetted, and the pollutants are completely eliminated; the texture can be obtained by the above operation. Soft, low-strength, low-density and low-hardness cork becomes a hard material with high strength and wear resistance and hardwood.

According to a further improvement, the cork is subjected to a high temperature and high pressure treatment after being subjected to steam preheating and pressure treatment, and the steam preheating and pressure curing treatment is a steam that is introduced into a space of the cork for a certain time and temperature.

Preferably, during the steam preheating pressure treatment process, the steam temperature is 120-200 ° C and the time is 2-10 min.

Since the cork observed under the microscope is composed of thousands of dead cells like a honeycomb, the cells are filled with air, forming a closed airbag. In order to reduce the contraction of the cells, the intracellular pressure is increased and the pressure is increased. For the cork texture, the cork is preheated and pressurized with steam before steam is introduced.

In a further improvement, during the high temperature and high pressure treatment, the steam is introduced for a period of 3 to 10 minutes, and preferably, the temperature of the steam is 140 to 170 °C.

During the continuous pressure treatment, the steam is introduced for 4-10 minutes, and the steam is introduced at a temperature of 100-150 °C.

During the continuous pressure treatment, the pressurization speed is 50-80 mm/min.

By defining the parameters of the steaming method when the softwood is compacted into hardwood, the prepared hardwood has high hardness and good specific gravity and bearing capacity.

In a further improvement, the method comprises the following steps:

(1) steam preheating pressure treatment: steam into the space where the cork is located, 150 ° C steam, the access time is 3 min;

(2) High temperature and high pressure treatment: the cork subjected to steam preheating and pressure treatment is applied at a temperature of 130 ° C, a pressure of 30 kg / cm ² is applied, and high temperature and high pressure treatment is carried out under continuous steaming conditions, high temperature and high pressure. The treatment time is 4 min, the steaming time is 4 min, and the steaming temperature is 150 ° C;

(3) Continuous pressure treatment: the cork subjected to the high temperature and high pressure treatment is subjected to a pressure of 30 kg/cm ² at a temperature of 175 ° C, a pressurization speed of 65 mm/min, and under continuous steaming conditions. The continuous pressure treatment was carried out, the time of the continuous pressure treatment was 5 min, the time of steam introduction was 5 min, and the temperature of steam introduction was 120 °C.

In order to adjust the inlet speed of the steam in each step, the uniformity of the wood is controlled, and the speed of the steam is 30-50 kg/min during the high temperature and high pressure treatment; the speed of the steam is introduced during the continuous pressure treatment It is 75-100 kg/min.

In order to prevent rapid cell breakage and breakage, oxygen is introduced into the steam during high temperature and high pressure treatment, and the oxygen gas is introduced at a rate of 1-3 kg/min.

The high temperature and high pressure treatment and the continuous pressure treatment step also include introducing steam of different colors and/or steam of different odors.

The invention can change the surface of the wood into various colors during the process of changing the cork into hardwood by introducing steam with different colors and odors, or the wood can emit various aromas; for example; Special flavors such as rosewood, rosewood and various redwoods.

Beneficial effect

The beneficial effects of the present invention are as follows:

1. After the above steaming method, the inner cells of the cork can be turned into a flat structure state, so that the treated cork has the characteristics and stability of the hardwood;

2. After the above steaming method, air, resin, tannin compounds and other impurities in the cork cells can be excluded, so that the treated cork has the tough property of hardwood;

3. At the same time, when steam is introduced, the hardwood can be changed into a variety of colors, patterns and smells of wood.

Embodiments of the invention

Example 1 Method for introducing steam when cork compaction is changed into hardwood

The method comprises the following steps:

a. High temperature and high pressure treatment: applying a certain pressure to the cork at a certain temperature, and performing high temperature and high pressure treatment under the condition that steam is introduced at intervals;

b. Continuous pressure treatment: the cork after high temperature and high pressure treatment is applied with a certain pressure at a certain temperature, and the continuous pressure treatment is carried out under the condition that steam is introduced at intervals.

Example 2 Method for introducing steam when cork compaction is changed into hardwood

The method comprises the following steps:

(1) Steam preheating and pressure treatment: steam entering a certain time and temperature into the space where the cork is located;

(2) High temperature and high pressure treatment: applying a certain pressure to the cork at a certain temperature, and performing high temperature and high pressure treatment under continuous steaming conditions;

(3) Continuous pressure treatment: The cork subjected to high temperature and high pressure treatment is subjected to a certain pressure at a certain temperature, and subjected to a continuous pressure treatment under continuous steaming.

Example 3 Method for introducing steam when cork compaction is changed into hardwood

The method comprises the following steps:

a. High temperature and high pressure treatment: the cork is applied at a temperature of 130 ° C, a pressure of 30 kg / cm ² , and high temperature and high pressure treatment under continuous steaming conditions, high temperature and high pressure treatment time is 4 min, steaming time 4min;

b. Continuous pressure treatment: the cork after high temperature and high pressure treatment is subjected to a pressure of 30 kg/cm ² at a temperature of 170 ° C, and the continuous pressure treatment is carried out under continuous steaming, and the time of the continuous pressure treatment is 5 min, the steaming time was 5 min.

Example 4 Method for introducing steam when cork compaction is changed into hardwood

The method comprises the following steps:

a. High temperature and high pressure treatment: the cork is applied at a temperature of 140 ° C, a pressure of 20 kg / cm ² , and high temperature and high pressure treatment under continuous steaming conditions, high temperature and high pressure treatment time is 5 min, steaming time 5 min, the temperature of steaming is 140 ° C;

b. Continuous pressure treatment: the cork after high temperature and high pressure treatment is subjected to a pressure of 15 kg/cm ² at a temperature of 190 ° C, and the continuous pressure treatment is carried out under continuous steaming, and the time of the continuous pressure treatment is At 6 min, the steaming time was 6 min, and the steaming temperature was 140 °C.

Example 5 Method for introducing steam when cork compaction is changed into hardwood

The method comprises the following steps:

a. High temperature and high pressure treatment: the cork is applied at a temperature of 140 ° C, a pressure of 35 kg / cm ² , and high temperature and high pressure treatment under continuous steaming conditions, high temperature and high pressure treatment time is 3 min, steaming time 3 min, the temperature of steaming is 140 ° C;

b. Continuous pressure treatment: the cork subjected to high temperature and high pressure treatment is subjected to a pressure of 20 kg/cm ² at a temperature of 180 ° C, a pressurization speed of 80 mm/min, and a continuous pressure under continuous steaming conditions. The treatment, the time of the continuous pressure treatment was 8 min, the time of steam introduction was 8 min, and the temperature of steam introduction was 100 °C.

Example 6 Method for introducing steam when cork compaction is changed into hardwood

The method comprises the following steps:

Example 7 Method for introducing steam when cork compaction is changed into hardwood

The method comprises the following steps:

(1) Steam preheating and pressure treatment: 170 ° C steam is introduced into the space where the cork is located, and the access time is 6 min;

(2) High temperature and high pressure treatment: the cork subjected to steam preheating and pressure treatment is applied at a temperature of 120 ° C, a pressure of 30 kg / cm ² is applied, and continuous flow of yellow steam and rosewood odor steam is carried out. High temperature and high pressure treatment, high temperature and high pressure treatment time is 5min, steaming time is 5min, steaming temperature is 170 °C;

(3) Continuous pressure treatment: the cork subjected to the high temperature and high pressure treatment is subjected to a pressure of 20 kg/cm ² at a temperature of 170 ° C, a pressurization speed of 60 mm/min, and continuous passage of yellow steam and red sandalwood The continuous pressure treatment was carried out under the condition of wood odor steam, the time of the continuous pressure treatment was 6 min, the time of steam introduction was 6 min, and the temperature of steam introduction was 130 °C.

Example 8 Method for introducing steam when cork compaction is changed into hardwood

The method comprises the following steps:

(1) steam preheating pressure treatment: steam into the space where the cork is located, 200 ° C steam, the access time is 4 min;

(2) High temperature and high pressure treatment: the cork after steam preheating and pressure treatment is applied at a temperature of 150 ° C, a pressure of 15 kg / cm ² is applied, and high temperature and high pressure treatment is carried out under continuous steaming conditions, high temperature and high pressure. The treatment time is 7 min, the steaming time is 6 min, and the steaming temperature is 160 ° C;

(3) Continuous pressure treatment: the cork subjected to the high temperature and high pressure treatment is subjected to a pressure of 25 kg/cm ² at a temperature of 160 ° C, a pressurization speed of 80 mm/min, and under continuous steaming conditions. The continuous pressure treatment was carried out, the time of the continuous pressure treatment was 4 minutes, the steaming time was 4 minutes, and the temperature of the steam was 150 °C.

Example 9 Method for introducing steam when cork compaction is changed into hardwood

The method comprises the following steps:

(1) Steam preheating and pressure treatment: steam of 130 ° C is introduced into the space where the cork is located, and the access time is 10 min;

(2) High temperature and high pressure treatment: the cork subjected to steam preheating and pressure treatment is applied at a temperature of 125 ° C, a pressure of 30 kg / cm ² is applied, and high temperature and high pressure treatment is carried out under continuous steaming conditions, high temperature and high pressure. The treatment time is 10 min, the steaming time is 10 min, and the steaming temperature is 150 ° C;

(3) Continuous pressure treatment: the cork subjected to the high temperature and high pressure treatment is subjected to a pressure of 30 kg/cm ² at a temperature of 170 ° C, a pressurization speed of 70 mm/min, and under continuous steaming conditions. The continuous pressure treatment was carried out, the time of the continuous pressure treatment was 10 minutes, the time of steam introduction was 10 minutes, and the temperature of steam introduction was 120 °C.

Experimental Example 1 Investigation of various parameters of high temperature and high pressure treatment

The time of high temperature and high pressure treatment was designed to be 0 min, 2 min, 3 min, 6 min, 10 min and 12 min, 6 levels, and the remaining steps were prepared according to the method of Example 9. The prepared hardwood specific gravity and the cellular state structure were investigated. The results are shown in Table 1;

The temperature of the high temperature and high pressure treatment was designed to be 10 levels of 110 ° C, 120 ° C, 135 ° C, 150 ° C and 160 ° C, and the remaining steps were prepared according to the method of Example 9, and the prepared hardwood specific gravity and the cellular state structure content were determined. Inspection, the results of the inspection are shown in Table 1;

The high temperature and high pressure treatment pressure was designed to be 10 kg/cm ² , 15 kg/cm ² , 25 kg/cm ² , 35 kg/cm ² and 45 kg/cm ² , 5 levels, and the remaining steps were as follows according to the method of Example 9. Preparation, the specific gravity of the prepared hardwood and the cellular structure of the honeycomb structure were investigated, and the results are shown in Table 1;

表1 高温高压处理各参数的考察结果 Table 1 High temperature and high pressure treatment

考察指标 Survey indicator		硬木比重（ kg/m Hardwood specific gravity (kg/m ³³ ） )	蜂窝状态组织结构含量（%） Cellular state tissue structure content (%)
时间（ min ） Time ( min )	0 0	70 70	98 98
	2 2	360 360	87 87
	3 3	400 400	71 71
	6 6	423 423	63 63
	10 10	450 450	53 53
	12 12	455 455	51 51
温度（ ℃ ） Temperature ( °C )	110 110	340 340	83 83
	120 120	415 415	72 72
	135 135	433 433	62 62
	150 150	460 460	50 50
	160 160	462 462	50 50
压力（kg/cm²）Pressure (kg/cm ² )	10 10	356 356	85 85
	15 15	415 415	74 74
	25 25	437 437	65 65
	35 35	472 472	54 54
	45 45	480 480	52 52

It can be seen from Table 1 that the time, temperature, and pressure during the high temperature and high pressure treatment have a significant effect on the specific gravity of the hardwood and the cellular structure. Only when the time is controlled within 10 minutes, the temperature is controlled at 150 °C, and the pressure is controlled. At 35 kg/cm ² , the specific gravity of the wood can be increased to about 450 kg/m ³ at low cost and low consumption, and about 50% of the honeycomb structure in the raw material cork can be converted into a solid core structure. When temperature, pressure, and processing time continue to rise, inputs and outputs are not directly proportional.

Experimental Example 2 Investigation of steaming time and steam temperature during high temperature and high pressure treatment

The steaming time during the high temperature and high pressure treatment was designed to be 0 min, 2 min, 3 min, 6 min, 10 min and 12 min, 6 levels, and the remaining steps were prepared according to the method of Example 9, and the resin in the internal structure of the prepared hardwood and The content of tannin compounds was investigated, and the results are shown in Table 2;

The temperature of the steam entering during the high temperature and high pressure treatment was designed to be 5 levels of 130 ° C, 140 ° C, 150 ° C, 170 ° C and 180 ° C, and the remaining steps were prepared according to the method of Example 9, and the internal structure of the prepared hardwood was prepared. The content of resin and tannin compound was investigated, and the results are shown in Table 2;

表2高温高压处理过程中通入蒸汽时间和蒸汽温度的考察结果 Table 2 Investigation results of steaming time and steam temperature during high temperature and high pressure treatment

考察指标 Survey indicator		树脂含量（ % ） Resin content (%)	单宁化合物含量（ % ） Tannin compound content (%)
时间（ min ） Time ( min )	0 0	2.03 2.03	10.2 10.2
	2 2	1.73 1.73	8.8 8.8
	3 3	1.57 1.57	7.9 7.9
	6 6	1.13 1.13	6.2 6.2
	10 10	0.78 0.78	4.1 4.1
	12 12	0.75 0.75	4.0 4.0
	130 130	1.59 1.59	8.1 8.1
	140 140	1.41 1.41	6.7 6.7
温度（ ℃ ） Temperature ( °C )	150 150	1.19 1.19	5.8 5.8
	170 170	0.76 0.76	4.0 4.0
	180 180	0.75 0.75	3.9 3.9

It can be seen from the table that in the process of high temperature and high pressure treatment, the resin and tannin compounds in the softwood cannot be excluded if steam is not introduced; the content of resin and tannin compound is remarkable as the steaming time and steam temperature increase. Decrease, when the steaming time reaches 10min or the temperature reaches 170°C, the content of resin and tannin compound has been reduced by about 60%. Continue to steam or increase the temperature has little effect on the content of resin and tannin compound. The input and output are not proportional; therefore, the time for steam introduction during high temperature and high pressure treatment is controlled within 3-10min, and the steam temperature should be controlled within 140-170 °C.

Experimental Example 3 Investigation of various parameters of continuous pressure treatment

The time of the continuous pressure treatment was designed to be 0 min, 3 min, 4 min, 7 min, 10 min and 12 min, 6 levels, and the remaining steps were prepared according to the method of Example 9. The prepared hardwood specific gravity and the cellular state structure content were investigated. The results are shown in Table 3;

The temperature of the continuous pressure treatment was designed to be 150 ° C, 160 ° C, 175 ° C, 190 ° C and 200 ° C, 5 levels, and the remaining steps were prepared according to the method of Example 9, and the prepared hardwood specific gravity and the cellular state structure content were determined. Inspection, the results of the investigation are shown in Table 3;

The pressure of the continuous pressure treatment was designed to be 10 kg/cm ² , 15 kg/cm ² , 25 kg/cm ² , 35 kg/cm ² and 45 kg/cm ² , 5 levels, and the remaining steps were as follows according to the method of Example 9. Preparation, the specific gravity of the prepared hardwood and the cellular structure of the honeycomb structure were investigated, and the results are shown in Table 3;

表3续压处理各参数的考察结果 Table 3 Continued Pressure Treatment Results of each parameter

考察指标 Survey indicator		硬木比重（ kg/m Hardwood specific gravity (kg/m ³³ ） )	蜂窝状态组织结构含量（ % ） Cellular state structure content (%)
时间（min） Time (min)	0 0	450 450	50 50
	3 3	520 520	45 45
	4 4	600 600	33 33
	7 7	640 640	24 twenty four
	10 10	700 700	13 13
	12 12	710 710	11 11
温度（ ℃ ） Temperature ( °C )	150 150	550 550	44 44
	160 160	620 620	32 32
	175 175	680 680	20 20
	190 190	720 720	9 9
	200 200	725 725	8 8
压力（kg/cm²）Pressure (kg/cm ² )	10 10	560 560	38 38
	15 15	610 610	29 29
	25 25	660 660	14 14
	35 35	710 710	5 5
	45 45	720 720	4 4

It can be seen from the table that the time, temperature and pressure of the continuous pressure treatment have a significant influence on the specific gravity of the prepared hardwood and the content of the cellular structure. Only when the time is controlled within 10 minutes, the temperature is controlled within 190 °C, and the pressure is controlled. In the range of 35 kg/cm ² , the specific gravity of hardwood can be provided at low cost and low consumption, most impurities in hardwood can be excluded, and the honeycomb structure can be largely changed into a linear strip structure; Temperature, pressure and processing time continue to rise, and inputs and outputs are not directly proportional.

Experimental Example 4 Investigation of steam temperature and time during continuous pressure treatment

The steaming time during the continuous pressure treatment was designed to be 0 min, 3 min, 4 min, 7 min, 10 min and 12 min, 6 levels, and the remaining steps were prepared according to the method of Example 9, and the resin in the prepared hardwood internal structure and The content of tannin compounds was investigated, and the results of the investigation are shown in Table 4;

The temperature of the steam introduced during the continuous pressure treatment was designed to be 90 ° C, 100 ° C, 120 ° C, 150 ° C and 160 ° C, 5 levels, and the remaining steps were prepared according to the method of Example 9, for the internal structure of the prepared hardwood. The content of resin and tannin compound was investigated, and the results are shown in Table 4;

表4续压处理过程中通入蒸汽时间和温度的考察结果 Table 4 Investigation results of steaming time and temperature during continuous pressure treatment

考察指标 Survey indicator		树脂含量（ % ） Resin content (%)	单宁化合物含量（ % ） Tannin compound content (%)
时间（min） Time (min)	0 0	0.73 0.73	3.9 3.9
	3 3	0.62 0.62	2.7 2.7
	4 4	0.51 0.51	2.1 2.1
	7 7	0.37 0.37	1.6 1.6
	10 10	0.25 0.25	0.9 0.9
	12 12	0.23 0.23	0.8 0.8
温度（ ℃ ） Temperature ( °C )	90 90	0.65 0.65	3.6 3.6
	100 100	0.52 0.52	2.4 2.4
	120 120	0.36 0.36	1.7 1.7
	150 150	0.26 0.26	0.9 0.9
	160 160	0.25 0.25	0.9 0.9

It can be seen from the table that when steam is not introduced during the continuous pressure process, the entire continuous pressure process can eliminate a very small amount of resin and tannin compound. When the steam is re-introduced, the steam can be introduced into the high-temperature and high-pressure treatment process. The remaining resin and tannin compound are excluded; the more the time is removed and the temperature of the steam increases, but when the time increases to 10 min or the steam temperature rises to 150 ° C, the content of the resin and tannin compound does not pass. Compared with steam, it has been reduced by more than 90%. After increasing the steaming time and steam temperature, the input and output are not proportional. Therefore, the steaming time during the continuous pressure treatment is controlled at 4-10min, and the steam temperature is controlled. 100-150 ° C.

Claims

A steaming method for cork compaction into hardwood, characterized in that the method comprises the following steps:

a. High temperature and high pressure treatment: applying a certain pressure to the cork at a certain temperature, and performing high temperature and high pressure treatment under the condition of intermittent or continuous steam introduction;

b. Continuous pressure treatment: The cork after high temperature and high pressure treatment is applied with a certain pressure at a certain temperature, and the continuous pressure treatment is carried out under the condition of intermittent or continuous steam introduction.
The method of steaming a softwood compacted into a hardwood according to claim 1, wherein the method comprises the steps of:

a. High temperature and high pressure treatment: the cork is applied at a temperature of 120-150 ° C, a pressure of 15-35 kg / cm 2 , and high temperature and high pressure treatment under the condition of continuous or continuous steam, high temperature and high pressure treatment time is 3- 10 minutes, the time of steaming is not greater than the time of high temperature and high pressure treatment;

b. Continuous pressure treatment: the cork after high temperature and high pressure treatment is applied at a temperature of 160-190 ° C, a pressure of 15-35 kg / cm 2 is applied, and the continuous pressure treatment is carried out under the condition of continuous or continuous steaming, continued The time for the pressure treatment is 4-10 min, and the time for introducing steam is not more than the time for the continuous pressure treatment.
The method for introducing steam into a hardwood when the cork is compacted into a hardwood according to any one of claims 1 to 2, wherein the cork is subjected to a high temperature and high pressure treatment after being subjected to steam preheating and pressure treatment, and the steam is preheated. The pressure-raising treatment is steam that is introduced into the space where the cork is located for a certain period of time and temperature.
The steaming method for cork compaction into hardwood according to claim 3, wherein during the steam preheating pressure treatment, the steam temperature is 120-200 ° C and the time is 2-10 min.
The steaming method for cork compaction into hardwood according to claim 2, wherein during the high temperature and high pressure treatment, the steam is introduced for 3-10 minutes, preferably, the temperature of the steam is 140-170 ° C.
The steaming method for cork compaction into hardwood according to claim 2, wherein during the continuous pressure treatment, steam is introduced for 4-10 minutes, and steam is introduced at a temperature of 100-150. °C.
The method of introducing steam when softwood compaction is changed into hardwood according to claim 2, wherein the pressurization speed is 50-80 mm/min during the continuous pressure treatment.
The method of steaming a softwood compacted into a hardwood according to claim 3, wherein the method comprises the steps of:

(1) steam preheating pressure treatment: steam into the space where the cork is located, 150 ° C steam, the access time is 3 min;

(2) High temperature and high pressure treatment: the cork after steam preheating and pressure treatment is applied at a temperature of 130 ° C, a pressure of 30 kg / cm 2 is applied, and high temperature and high pressure treatment is carried out under continuous steaming conditions, high temperature and high pressure treatment. The time is 4 min, the steaming time is 4 min, and the steaming temperature is 150 ° C;

(3) Continuous pressure treatment: the cork subjected to the high-temperature and high-pressure treatment is subjected to a pressure of 30 kg/cm 2 at a temperature of 175 ° C, a pressurization speed of 65 mm/min, and under continuous steaming. The continuous pressure treatment, the time of the continuous pressure treatment is 5 min, the time of steam introduction is 5 min, and the temperature of steam introduction is 120 °C.
The steaming method for cork compaction into hardwood according to claim 2, wherein said high temperature and high pressure treatment and said continuous pressure treatment step further comprises introducing steam of different colors and/or steam of different odors.