JP2003053711A - Manufacturing method for lignocellulose molded article, and mold therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method and a mold which enable manufacture of a homogeneous molded article of a large adhesive strength from lignocellulose and also enable further simplification of a manufacturing apparatus thereof and easy and inexpensive automation of equipment. SOLUTION: The mold 1 has a constitution wherein a male form 2 and a female form 3 are fitted and supported by a support 4 so that they can move vertically. A primary molded article 7 made of the subdivided lignocellulose is inserted into the mold from an opening part 6 opened by rotating a connecting rod 5 and it is pressed, clamped and locked at the clamping position by a locking mechanism provided for the mold. The mold 1 holding the primary molded article 7 can be moved, as it is, to each manufacturing process.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for producing a lignocellulosic molded article from a lignocellulosic material and a molding die.

[0002]

2. Description of the Related Art A method for producing a board, a composite wood, a molded product or the like from a lignocellulosic material without using a synthetic resin binder is disclosed in JP-A-60-206604. A method for producing a wooden board from a finely divided wooden raw material without using an adhesive is also disclosed in JP-A-10-16.
It is disclosed in Japanese Patent No. 6323. The advantage of these manufacturing methods is that they do not require expensive adhesive binders and have excellent economic and environmental properties. However, currently commercialized products are only to the extent that wooden boards are used for weed control as civil engineering materials, and the manufacturing method is the method disclosed in Japanese Patent Laid-Open No. 11-342504.

The above-mentioned manufacturing equipment has the problems that the raw material filling step and the molded article extracting step are complicated, the equipment cost is too high for automation, and the container part (tray) is deformed and the durability is poor. . Further, the molded product is easily broken, and a product having higher bending strength is required.

[0004]

In order to solve the above problems, an object of the present invention is to further simplify the manufacturing process and the manufacturing apparatus, and to manufacture inexpensive and efficient equipment and products having excellent mechanical strength. It is an object of the present invention to provide a method for producing a molded product of a lignocellulosic material and a molding die thereof.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the invention of claim 1 compresses and reduces the volume of the finely divided lignocellulosic material so that the volume becomes 1/4 to 2/3. A primary molded product is made and the primary molded product is housed in a molding die. The molding die is placed in a pressure vessel and steamed. After that, the molding die is taken out from the pressure vessel, and the die is closed with a press machine at a pressure of 2 MPa or more.
Immobilization with water vapor is carried out with the mold closed.

Lignocellulosic materials include stem. Stem.
leaf. root. shell. fiber. sawdust. Rice husk. straw. There are woody substances and agricultural plants in the form of grass, but not limited to this, and components such as waste paper cellulose and hemicellulose, and lignin are also included.

A known compression-volume reducing machine may be used in order to produce a compression-reduced primary molded product, but it may be placed in a mold and compressed by a press. Usually compressed in air,
It may be heated or evacuated and compressed. In the case of a shape that easily loses its shape, it is preferably subjected to a softening treatment, powdered or fibrous. The primary molded product is 1. of the molded product (product).
Although the shape has a volume of 2 to 3 times, not only the same number as the molded product but also a divided molded product may be made into one molded product.

[0008] The steaming treatment is the decomposition and hydrolysis of the hemicellulose part of the lignocellulosic material to convert it into free sugars, carbohydrates or sugars. The cooking temperature is 120 ° C or higher, preferably 150 ° C or higher. Again 12
By steaming with steam at 0 ° C. or higher, the primary molded product expands in the molding die and the packing density in the molding die can be made uniform.

After the steaming treatment, the molding die is compressed by a pressing machine and locked at a predetermined position. A compression pressure of about 0.5 to 2 Mpa was generally used as a guide, but in order to increase the strength of the molded product and to squeeze out the moisture absorbed during cooking to reduce the water content, it is preferably 2 MPa or more. Press at a pressure of about 3 Mpa.

The immobilization treatment is a treatment in which the primary molded article is heated and compressed with steam at 180 ° C. or higher in a state of being compressed in a molding die, and free sugars and the like in the lignocellulosic material are polymerized substances. And the lignocellulosic material is fixed and molded.

In the molding die according to the second aspect of the present invention, the primary molded product of the subdivided lignocellulosic material is inserted into and molded into the pair of molds provided with the male mold and the female mold. An opening is provided on the side surface of the mold for taking out the mold, and a lock mechanism that can hold the mold closed state is provided.

[0012] This molding die facilitates insertion into and removal from the molding die, and can be handled in the form of a volume-reduced primary molded product, so that the molding die can be downsized. Further, instead of accommodating in the form of a primary molded product, it is also possible to directly accommodate the fragmented lignocellulosic material from the opening of the molding die without forming the primary molded product.

According to the third aspect of the present invention, the primary molded product is placed on a Teflon processed seat plate so as to be conveyed integrally with the seat plate and can be inserted into and taken out from a molding die.

Since the primary molded product easily loses its shape, it is placed on a seat plate made of a flat plate or the like during transportation. For products with complicated patterns and three-dimensional molded products, use a seat plate whose upper surface is formed to correspond to the molded product, so that the female form can be matched to the type of molded product. Various molded products can be manufactured by changing only the seat plate without changing. On the upper surface of the seat plate, Teflon coating or Teflon sheet is attached so that the seat plate and the molded product can be easily separated.

In the invention according to the fourth aspect, the seat plate is formed in a kite shape by stacking the L-shapes face to face.

A primary molded product made from a chip form is difficult to form and soon loses its shape. In that case, two L-shaped plates are stacked face-to-face to form a kite type (trough type) seat plate, in which the primary molded product is made, and then transferred and attached to and removed from the molding die as it is. To do so. It is difficult to remove the molded product with the integrated type seat plate, but in the case of the seat plate combined with the L-shape to form the seat type, the molded product can be easily taken out and taken out. .

According to a fifth aspect of the present invention, a plurality of the molding dies are stacked and all stages are simultaneously opened and closed,
It is preferable in terms of efficiency and cost to provide a locking mechanism that can be locked together.

The shape of the molded article produced from the lignocellulosic material according to the present invention is not particularly limited and may be plate-shaped.
Pillar. Block shape. spherical. A three-dimensional shape etc. can be illustrated.
Therefore, the male mold of the mold. The shape of the female mold can be appropriately determined according to the shape of the molded product. It is also possible to attach a die to the male mold and put a seat plate in the female mold to use a die and a seat plate that match the shape of the molded product.

When the primary molded product is molded from a defibrated fiber or the like and does not lose its shape, the mold is closed with a press and fixed with high-pressure steam without being steamed after being housed in a molding die. A molded product can be manufactured only by subjecting to a chemical treatment.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described with reference to the drawings regarding an embodiment example in which a board is made from a cedar chip material.

First, in the molding die 1 of the first embodiment shown in FIGS. 1 to 4, the male mold 2 and the female mold 3 are vertically movably mounted and supported by the columns 4, and the connection rod 5 is rotated to form an opening. A lock mechanism for inserting the primary molded product 7 from the portion 6 into the mold and pressing and locking it at the position where the mold is closed is provided.

The primary molded product 7 shown in FIG. 1 is composed of a plurality of primary molded products 7 (a) and a primary molded product 7 formed integrally.
The primary molded product 7 having (b) and easily deformed is a seat plate 8
Place it on top of it and move it, or remove it from the mold. Seat plate 8
In the case of the kite type seat plate 18 in which two L-shaped plates are faced to each other to form a kite type, the primary molded product 7 does not lose its shape and is easily disassembled to take out the molded product 9. You can

The male mold frame 2 is provided with a tab 10 on its side surface, and is pushed up by a spring 11 above the female mold frame 3 to open the frame. A lock nut 12 is screwed to the upper end of the support column 4 so that the position of the lock nut 12 can be adjusted, and the open frame height of the male frame 2 is regulated. The female mold 3 is fixed on the substrate 13, and the connected lot 5 pivotally supported on the substrate 13 is provided with a side plate 14 for closing the opening 6 of the molding die 1 and a lock pin hole 15. ing.

FIG. 2 shows a state in which the primary molded product 7 is housed in the molding die 1, and FIG. 3 is a side view when the molding die 1 is closed, in which the male frame 2 is pressed by the press 16 Shows a state in which the molding die 1 is locked by pushing down to close the die, inserting the lock pin 17 into the lock pin hole 15 and the hole of the earpiece 10. The primary molded product 7 is pressed and compressed into the shape of the molded product 9.

FIG. 4 is a front view when the molding die is closed, but shows the state in which the side plate 14 is removed for the sake of clarity.

FIG. 5 shows a molding die 1 according to a second embodiment in which a plurality of pairs of dies are stacked. The lowermost female mold 3 and the uppermost male mold 2 are the same as the mold of the first embodiment, but the middle middle mold 19 has a lower male surface and an upper female shape. Made of The support columns 4 and the connecting rods 5 become longer according to the number of the middle molds 19 to be stacked.
The lock mechanism locks by inserting the lock pin 17 into the lock pin hole 15 of the connecting rod 5 and the earpiece 10 attached to the uppermost male frame 2.

Next, a method of manufacturing a board using the molding die 1 will be described. Storage of Primary Molded Article-As shown in FIG. 1, the connecting rod 5 is rotated to open the opening 6,
The primary molded product 7 is inserted into the molding die 1. If needed,
The primary molded product 7 is placed on the seat plate 8 and inserted.

Steaming treatment-Molding mold 1 is put in a pressure vessel (not shown) and sealed, steam is introduced into the pressure vessel, and steaming treatment is performed at high temperature and high pressure of 120 ° C or higher for 5 times. Do more than a minute.

Compressing Step-After steaming, the molding die 1 is taken out of the pressure container, compressed by the press 16 as shown in FIG. 3, and the lock pin 17 is used to hold the mold closed state.
Insert and lock in the compressed state.

Fixing Process-Locked Mold 1
Is placed in a pressure vessel and sealed, water vapor at 180 ° C. or higher is introduced into the pressure vessel, and heating is performed for 5 minutes or more to perform a fixing treatment.

Removal of Molded Product-Molding mold 1 that has been fixed is removed from the pressure vessel and cooled to 100 ° C. or lower. After cooling, the lock pin 17 is removed, the opening 6 of the molding die 1 is opened, and the molded product 9 is taken out.

As described above, according to the method for producing a molded product of lignocellulosic material and the molding die thereof according to the present invention, by using the primary molded product, it is not necessary to use a conventional tray. The manufacturing process and apparatus can be simplified, and the equipment can be automated easily and at low cost. Also, 1
By steaming the next molded product, adhesive bonding is promoted, strength is increased, and a molded product having a uniform density can be produced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state immediately before a primary molded product is inserted into a board molding die according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state before compression of a molding die.

FIG. 3 is a cross-sectional view showing a state after compression of a molding die.

FIG. 4 is a front view showing a state after compression of the molding die.

FIG. 5 is a front view showing a state after compression of the board molding die according to the second embodiment of the present invention.

[Explanation of symbols]

1 Mold 2 male formwork 3 female formwork 4 props 5 connection rod 6 openings 7 Primary molded products 8 seat 9 molded products 13 board 14 Side plate 16 Press machine 17 Lock Pin 19 Medium formwork

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B29K 105: 26 B29K 105: 26 F term (reference) 2B260 BA01 BA07 BA18 CB01 EA05 EB02 EB06 EB21 EB23 EC18 4F202 AA01 AA50 CA09 CB01 CK42 CL46 CR03 4F204 AA01 FA01 FB01 FE06 FE16 FF01 FF23 FH06 FN11 FN20 FQ40

Claims (5)

[Claims] 1. A primary molded product is produced by compressing and reducing the volume of a finely divided lignocellulosic material to a volume of 1/4 to 2/3, and the primary molded product is housed in a molding die. To do. The molding die is put into a pressure container for steaming treatment, then the molding die is taken out of the pressure container, and the mold is closed with a press machine at a pressure of 2 MPa or more. A method for producing a lignocellulosic material molded article, which comprises immobilizing treatment with steam while maintaining the mold closed state. 2. A pair of molds having a male mold and a female mold are provided with an opening for inserting and removing the primary molded product of the subdivided lignocellulosic material of the mold. A mold for a lignocellulosic material molded product, which is provided on the side surface and has a locking mechanism that can hold the mold closed state. 3. The Teflon (registered trademark) is used as the primary molded product.
The molding die according to claim 2, wherein the molding die has a structure such that the molding die can be placed on a processed seat plate, conveyed integrally with the seat plate, and inserted into and taken out from the molding die. 4. The seat plate is formed in a kite shape by stacking L-shapes facing each other.
Mold as described. 5. The molding die according to claim 2, further comprising a lock mechanism capable of stacking a plurality of the pair of dies and simultaneously opening and closing all tiers and locking them together.