CN104511953B

CN104511953B - Pine drying method

Info

Publication number: CN104511953B
Application number: CN201310725712.5A
Authority: CN
Inventors: 颜军
Original assignee: LIUZHOU LINDAO LIGHTWEIGHT WOODEN STRUCTURE MANUFACTURING Co Ltd
Current assignee: LIUZHOU LINDAO LIGHTWEIGHT WOODEN STRUCTURE MANUFACTURING Co Ltd
Priority date: 2013-12-25
Filing date: 2013-12-25
Publication date: 2017-01-25
Anticipated expiration: 2033-12-25
Also published as: CN104511953A

Abstract

The invention discloses a pine drying method, and belongs to the field of timber processing. The method comprises the following steps: selecting pine sheets with the thickness of 25-35mm and the water content of 40-45% before drying, putting the pine sheets in a kiln, stacking, using division bars between layers of the pine sheets, making a pine water content drying reference according to the dimension of the stack of the pine sheets, the flow velocity of a drying medium and the water content of the sheets, setting a wet and dry bulb temperature according to the water content drying standard, starting a system in the drying kiln to carry out automatic heating and steam injection to a preset required range, cooling the pine sheets, and discharging the cooled pine sheets from the kiln to obtain a finished product. The method allows the water content of the timber to be balanced in the drying process by adopting the pine drying reference and using automatic steam injection, prevents the deformation, cracking and bending of the sheets in the drying process, and realizes an optimal drying state through multi-time automatic steam injection, humidity elimination and adjustment.

Description

The drying meanss of Masson Pine

Technical field

The present invention relates to wood processing technique field, especially a kind of drying meanss of Masson Pine.

Background technology

Timber must carry out pretreatment before being taken into use, and wherein, the drying of wood is an important step, is also first The most key operation in road；The quality of dry mass directly influences the utilization rate of timber and the processing of back segment operation, directly Affect the height of woodwork final quality.Cunninghamia lanceolata (Lamb.) Hook. is one of most important special product commerical tree species in south China particularly Guangxi, Masson Pine growth is fast, and texture is straight, wooden exquisiteness, but the aqueous component of Masson Pine is big, easy to crack, causes the wood comprehensive utilization rate of Masson Pine Low.Carry out wildwood protected project with China, limit is cut down, prohibits the prevalence cutting down, and timber is very in short supply；In order to reasonable using wood Material, people are prevented epidemic to its parasite killing using the method that Masson Pine is dried and prevent, and prevent Masson Pine woodwork from going bad and rotten, improve Masson Pine The stability of woodwork and intensity.It is divided into time drying schedule and moisture content that base is dried using drying schedule in timber at present Standard, according to drying time formulate drying schedule cry time drying schedule, that is, entirely be dried needed for time be divided into several Time period, and specify corresponding medium temperature and humidity by each time period；And at present at home, abroad, all there is no special pin Benchmark is set to the drying of wood of Masson Pine, adopts kiln drying method the drying meanss of the Masson Pine of prior art more, will Masson Pine pile up In dry kiln, repeat alternately to heat furnace air and to spraying steam in kiln, and air blast makes furnace air and steam circulation, to Masson Pine It is dried, due to not grasping the optimum drying benchmark of Masson Pine material, in dry run, various data settings are unreasonable, make Become timber in temperature rise period just drying, ultimately cause Masson Pine in dry run and easily warp, the problem of cracking.

Content of the invention

The technical problem to be solved is to provide a kind of drying meanss of Masson Pine, and the drying meanss of this Masson Pine can To solve the problems, such as that Masson Pine easily warps, ftractures.

In order to solve the above problems, the technical solution adopted in the present invention is: first piles up Masson Pine sheet material dry before drying In dry kiln, the steps include:

(1) select sheet metal thickness to be 25mm-50mm, moisture content is the Masson Pine sheet material of 40%-45%, put in kiln；

(2) the Masson Pine plate material lamination in kiln is stacked, between layers using parting bead, between each parting bead of same layer away from From≤1200mm, every layer of parting bead is from top to bottom maintained on a vertical line in short transverse, be arranged on deal board end every Bar should be flushed with plate end；

(3) formulate Masson Pine moisture content and be dried according to the moisture content of the size of Masson Pine sheet material heap, the flow velocity of dried medium, sheet material Benchmark, and wet and dry bulb temperature is set according to this moisture content drying schedule, start the system in dry kiln automatically heated and Spray is steamed, and reaches sets requirement scope, kiln discharge after the cooling of Masson Pine sheet material, you can obtain finished product.

In technique scheme, more specifically technical scheme is it may also is that in described (3) step, Masson Pine drying schedule is: Wet and dry bulb initial temperature in described dry kiln is set as 50 DEG C, and the final moisture content of Masson Pine sheet material is set as 8%, during heat drying, Temperature rise period is set as heating up once for 7 hours, heats up 5 degree to 8 degree every time, heat drying maximum temperature is set as 75 DEG C；Masson Pine Sheet material stabilization sub stage moisture content is set as 10%, and time stabilization sub stage is set as 4 hours；The regulating time adjusting moisture content is little for 3 When, Masson Pine sheet material is set as 7.5% in regulation phase balancing moisture content.

Due to employing technique scheme, the present invention compared with prior art has the advantages that

1st, in dry run, using the Masson Pine drying schedule of the present invention, make timber in dry run using automatic spray steaming Middle moisture content is balanced, and prevention sheet material occurs that in dry run the phenomenon of deformation, cracking and bending occurs, and passes through Repeatedly spray is steamed automatically, and dehumidifying is adjusted to optimum drying state.

2nd, due to when Masson Pine plate material lamination stacks, using parting bead in material heap, the sheet material of adjacent two layers is made to be formed separately Uniform steam flow circulation canal, the dried medium of circulation and the surface of timber carry out hot and humid area, material can be made to pile up using parting bead Keep stable on width, so that the timber in material heap is clamped mutually, prevent and mitigate wood-bending.

Specific embodiment

Below in conjunction with instantiation, the invention will be further described:

Embodiment 1:

The dry kiln of the present invention adopts 105m3 sage's Amway board aluminium alloy that Kaiyuan City Ao Shi drying equipment company limited produces Kiln, is provided with 2 groups of radiators, 5 Fans, 2 groups of moistureproof windows, every group of moistureproof window has 7 moistureproof windows, the micro- electricity of dehumidifying in this dry kiln Machine has 3 voltage 24w, and moisture content wire has 3 groups, and temperature sensor has 2 groups, and equilibrium moisture content sensor has 2 groups, pipeline No. 3 steam inlet pipe roads, water return pipeline, steam spray pipe road, actuator, electric steam fine adjustment valve, dehumidifying micro machine and spray is had to steam electricity Magnet valve；

When Masson Pine sheet material being dried, first Masson Pine sheet material is piled up in dry kiln before baking, the steps include:

(1) select sheet metal thickness to be 25mm, moisture content be 40% Masson Pine sheet material, put in kiln；

(2) the Masson Pine plate material lamination in kiln is stacked, between layers using parting bead, between each parting bead of same layer away from From 600mm, every layer of parting bead is from top to bottom maintained on a vertical line in short transverse, and the parting bead being arranged on deal board end should Flush with plate end；

(3) Masson Pine drying schedule is formulated according to the moisture content of the size of Masson Pine sheet material heap, the flow velocity of dried medium, sheet material, Drying schedule sets table such as table 1, and presses table 1 setting parameters, then starts the drying system of dry kiln, dry run is such as Under:

It is that 40% Masson Pine sheet material preheats first to moisture content, during preheating, does not spray steaming, not dehumidifying, set and rise for every 7 hours Temperature once, heats up 5 degree every time, is raised to 35 DEG C, and system enters the heating period, and now heating system continues to enter by setting programming rate Row heats up, and heats up once within every 7 hours, heats up 5 degree every time, initial temperature 50 DEG C is dried up to what temperature reached setting；System Enter drying stage, this stage programming rate is identical with the first two stage programming rate, and temperature rises to 70 DEG C, and keeps this Temperature 4 hours, when Masson Pine sheet material moisture content reaches setting value 10%, temperature continues to rise to 75 DEG C, and keeps this temperature 96 little When, interior during this period, when equilibrium moisture content reaches setting value 7.5%, spray steaming will be started working, and steam injection time is 3 hours, When moisture content reaches final moisture content setting value 8%, shut down, enter holding stage, be incubated 24 hours, blower fan remains in operation, row Wet window dehumidifying, makes temperature drop, and temperature is down to 30 DEG C -35 DEG C, and whole process terminates, and Masson Pine sheet material can be with kiln discharge.

It is to carry out in the regulation stage that spray in dry run is steamed, and the regulation stage is to maintain the final temperature of drying stage not Become, equilibrium moisture content value is set by adjusting humidity in program, the effect in this stage is to remove to do to be produced during timber Raw internal stress, also can make the moisture content of desiccated wood uniform by adjusting humidity.

Embodiment 2:

The dry kiln of the present embodiment is same as Example 1, when Masson Pine sheet material being dried, before baking first by Masson Pine Sheet material is piled up in above-mentioned dry kiln, the steps include:

(1) select sheet metal thickness to be 35mm, moisture content be 45% Masson Pine sheet material, put in kiln；

(2) the Masson Pine plate material lamination in kiln is stacked, between layers using parting bead, between each parting bead of same layer away from From 1200mm, every layer of parting bead is from top to bottom maintained on a vertical line in short transverse, is arranged on the parting bead of deal board end Should flush with plate end；

It is that 45% Masson Pine sheet material preheats first to moisture content, during preheating, does not spray steaming, not dehumidifying, set and rise for every 7 hours Temperature once, each intensification 5-8 degree, be raised to 35 DEG C, system enter the heating period, now heating system continue by set programming rate Heated up, heated up once within every 7 hours, each intensification 5-8 degree, until temperature reach setting initial temperature 50 DEG C is dried； System enters drying stage, and this stage programming rate is identical with the first two stage programming rate, and temperature rises to 70 DEG C, and protects Hold this temperature 4 hours, when Masson Pine sheet material moisture content reaches setting value 10%, temperature continues to rise to 75 DEG C, and keeps this temperature 96 hours, interior during this period, when equilibrium moisture content reaches setting value 7.5%, spray steaming will be started working, and steam injection time is little for 3 When, when moisture content reaches final moisture content setting value 8%, shut down, enter holding stage, be incubated 24 hours, blower fan continues fortune Turn, moistureproof window dehumidifying, make temperature drop, temperature is down to 30 DEG C -35 DEG C, and whole process terminates, Masson Pine sheet material can be with kiln discharge.

Table 1:

Claims

1. a kind of drying meanss of Masson Pine, it is characterised in that first piling up Masson Pine sheet material in dry kiln before drying, the steps include:

(1) select sheet metal thickness to be 25mm-35mm, moisture content is the Masson Pine sheet material of 40%-45%, put in kiln；

(2) the Masson Pine plate material lamination in kiln is stacked, between layers using parting bead, distance between each parting bead of same layer≤ 1200mm, every layer of parting bead is from top to bottom maintained on a vertical line in short transverse, and the parting bead being arranged on deal board end should Flush with plate end；

(3) formulate Masson Pine moisture content base is dried according to the moisture content of the size of Masson Pine sheet material heap, the flow velocity of dried medium, sheet material Standard, and wet and dry bulb temperature is set according to this moisture content drying schedule, the system starting in dry kiln is automatically heated and is sprayed Steam, reach sets requirement scope, kiln discharge after the cooling of Masson Pine sheet material, you can obtain finished product；Masson Pine drying schedule is: to deal board Material is preheated, and sets every 7 hours and heats up once, heat up 5 degree to 8 degree every time, be raised to 35 DEG C, system enters the heating period；Directly Wet and dry bulb initial temperature to described dry kiln is set as 50 DEG C, and the final moisture content of Masson Pine sheet material is set as 8%, heat drying When, the temperature rise period is set as heating up once for 7 hours, heats up 5 degree to 8 degree every time, heat drying maximum temperature is set as 75 DEG C；Pine Wood plank stabilization sub stage moisture content is set as 10%, and time stabilization sub stage is set as 4 hours；Temperature continues to rise to 75 DEG C, and protects Hold this temperature 96 hours, interior during this period, when equilibrium moisture content reaches setting value 7.5%, spray steaming will be started working, and spray is steamed Time is 3 hours, when moisture content reaches final moisture content setting value 8%, shuts down, enters holding stage, is incubated 24 hours, wind Machine remains in operation, moistureproof window dehumidifying, makes temperature drop, and temperature is down to 30 DEG C -35 DEG C.