JPS59120440A - Manufacture of wood fiber mat for deep drawing molding - Google Patents

Abstract

PURPOSE:To easily obtain a wood fiber mat with a better deep drawing moldability by a method wherein a wood fiber obtained by steam boiling a wood chip for decomposition of fiber is mixed additively with a long fiber, a powdery thermosetting synthetic resin and a thermoplastic synthetic resin and dried by heat after the matting thereof. CONSTITUTION:A wood chip of a needle-leaved tree is steam boiled for decomposition of fiber to obtain a wood fiber by separating steam. The wood fiber is taken out as intact without being dried, mixed additively with a long fiber large in the tensile strength, a powdery thermosetting synthetic resin such as phenol resin powder and a powdery or fibrous thermoplastic synthetic resin such as polyethylene fiber and then, a powdery synthetic resin is distributively attached onto the surface of the wood fiber. The mixture thus obtained is treated with a cotton making machine to form a mat, which is squeezed being dried by heat at the temperature above the melting point of said thermoplastic synthetic resin but not reaching the hardening temperature of the thermosetting synthetic resin to obtain a desired mat.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing pine 1- for deep drawing, which is made by steaming and defibrating wood chips and combining them with a wood fiber braid 4'.

Traditionally, we have manufactured pine for molding using wood fiber as the main raw material.
Various methods are known for this. Here are the main things: (1) wood - fibrillating the whelk
4. Wet-wet woven cloth, thermoplastic or thermosetting synthetic resin adhesion agent to the treated essential fibers. Combine and make this!
(2) After drying the defibrated and C1rf wood fiber Iff, combine the Iff and the synthetic tree bonding agent 1 and 111. (3) After forming a soft fiber-like material, it is defibrated into a fibrillated layer 11, and then mixed with common sense Ift and a synthetic resin contact agent. 11 stacks of needle pans and 14 needles! (There is a method to form pine trees.

Among these Pun people, σ11) Nisho Zōnin (:'
)i5'j ''',) Lζ・ツ(-(Because the entanglement between the thin eyebrows is human, it is ill for deep drawing molding, and the heat mixed with 41<, It is necessary to dry at a temperature that reaches the curing temperature of the curable resin.
There is a disadvantage that there is a disadvantage in drying J9 to long 1(, 111 to 111), and since the mixing of resin and abrasion is done wet, there is a loss of Wt of the resin, and -4 to the resin fiber. The disadvantages of low fixation rates can be overcome by using dry wood fibers as raw materials.
41 When drying, there is a risk of fire and -V accidents during drying, and when synthetic resin is mixed with this, the resin is uniformly deposited on the fibers and moves. Therefore, there are problems such as the need to add an excessive amount of resin. In addition to the need for an extra process such as the treatment of the fibers of the bamboo dark blue board, there is also the same disadvantage as mentioned above in that it is difficult for the resin to adhere uniformly to the fibers that have been dewoven. Often 11 out of 10 is pine! Since it remains in the pores, it becomes an obstacle during molding and skin processing, and none of the results were satisfactory as a method for producing pine for deep drawing.

The present invention has succeeded in solving the above-mentioned conventional problems to an extremely large extent using the 1j method. In other words, is it necessary to defibrate wood chips to produce 1q of wood fibers? -c, After defibrating the wood chips by steaming, steam them with Reiklon for 9 hours and 1 hour - (dry U
1: Take out wood fibers with a moisture content of 40-50%, and add long fibers to this wood woven eaves.

Powdered heat 14! Addition and mixing of f1 synthetic resin and powdered or (1 fibrous thermoplastic 1)1 synthetic resin (J especially J
, Powdered thermosetting +1 resin and powdered heat? i
The J plastic synthetic resin adheres extremely effectively to the surface of the wood fibers due to the moisture contained in the wood fibers, and is then applied to the surface of the wood fibers using the cotton manufacturing equipment. The present invention was completed by discovering that most of the adhesive resin was 119 (119).

In the case of item I, it is necessary to take into consideration the adhesion to wood fibers, especially when the thermoplastic synthetic resin is in the form of fibers. Thermoplastic 11 synthesis (D) The presence of fat is indispensable for maintaining the shape retention strength of the molding pine 1 by 1v, as described later in 4, J, and 3C.

That is, in the present invention, the water side depth is defibrated by steaming, and the defibrated fibers from which the C water vapor is separated are dried. First, a powdered thermosetting synthetic resin and a powdered or fibrous thermoplastic synthetic resin are added and mixed to the first culm and the wood fibers according to one's common sense of tensile strength (powdered synthetic resin). A mixture in which the resin was distributed and adhered to the surface of the wood fiber 11 was applied to the 1!Noru Daiichi''-]-culm, and the interstitial material was put into a cotton-making machine (No (Mat Dozuru Daiichi-1 culm, Sai 7). Melt the plastic synthetic resin f:, i
Is it J-? 1" Made of pine for deep drawing molding characterized by being composed of a 41st culm that reaches the curing temperature of thermosetting synthetic resin and is compressed while heating and drying in a temperature range 1-)
The wood fibers obtained by defibrating A C Al wood fibers usually have a very short center fiber length of 1-2 mm, which alone makes it possible to form a fiber mat with good moldability. Since this is not possible, we modified this method by using long fibers, such as cotton, vegetable fibers such as hemp, animal fibers such as wool, etc., with a length of 10 mm.
50 mm and mixed with wood fibers at a mixing ratio of 90° or dry weight ratio of wood fibers to long fibers.
:10-・CiO:40 is appropriate, and if the ratio of long fibers is less than 10%, sufficient pine I-strength will not be achieved [1'. If the strength of the deep-drawn product exceeds 40%, the strength and water resistance of the deep-drawn product will decrease, and quality problems will occur, such as loss of surface smoothness.

Powdered thermosetting synthetic resin used in the present invention)
1-nor resin, urea-melamine resin, urea-melamine resin <r, powdery or fibrous thermoplastic synthetic resin such as borenyl-1-dylene, poly-brane, modified 11J-bui [1-n], and other low melting point resins. Used, the thermoplastic 1! l! ! 1) When the synthetic resin is in the form of fibers, the fiber length should be increased from -1 to 1 for uniform mixing! i +++m is appropriate.

Sonobu, the amount of these synthetic resins used is 5 to 20% of the amount of thermosetting resin used for the combined drying of wood, silk, and high quality fibers.
%, heatable fi! ! 1 < 1 Resin has a suitable amount of 3.-5%.
The long fibers are used in the above-mentioned condition (40 to 50% moisture), and are added to this while trying to achieve a uniform ratio; on the surface (~
The purpose is to dry the fibers (if used, there is a risk of fire or explosion during drying).
C) A) The wood-like synthetic resin becomes insufficient, and the proportion of IIIJ falling during mixing and agitation increases.
No. In addition, when forming IJT mats in cotton manufacturing equipment, wood fibers and long fibers are separated and deposited on the 1sl.
There is a problem that the pine trees 1 to 1 are not 1q and are uniform.

In addition, the thermoplastic synthetic resin used in Mokubeimon is melted and flows between the five synthetic fibers by heating and drying in the fourth I culm, and when compressed, the thermoplastic synthetic resin is melted and flows between the five synthetic fibers. Tighten the connection between the fiber and the long fiber navy blue,
Shape retention 1' that can withstand the handling of molding mats! When 1 is applied, the molding mat is melted and flowed by C1 under high temperature and pressure during deep drawing to loosen the bonds between the fibers and make it fit well in the deep drawing mold.

The powdered thermosetting synthetic resin adhered to the surface of the molding pine 1- of the present invention is fluidized to a depth of 43 degrees (deep drawing mouth).
Ru. The lignin and polysaccharides contained in the same I1.1 are plasticized and exuded, and the N4'j synthetic silk fibers are strongly bonded and hardened, resulting in deep drawing with high strength and good water resistance f1. The quality is IK! , can be done.

In addition, when performing the second culm using a mixture of wood fibers and long fibers, O4 to 01
By adding and mixing Bala Twin R Socks with a diameter of Φ%, it is possible to further improve the water resistance of the deep-drawn product.

1 - As explained above, the present invention makes it easy to
It is possible to easily produce molding pine with good deep drawing formability from culm. The dangers of fire, explosion, etc. seen in the dry manufacturing method described in (2) above are avoided.

Examples of the present invention will be shown below. A 1.21-leaf tree, Honji f-Wheel, was subjected to black spot fibrillation to separate water vapor, and a 71-fiber navy blue tree with a water content of approximately 45% was produced. Next is this woody #! ! For 80 small skewers of i-string (dry weight), 1 part of 40 mm cut 20 pieces of hemp was mixed, 7 parts by weight of furanol resin powder, and 2 mm cut polycordylene fiber triple Φ with a melting point of 110°C. part, pants in wax 0.5 weight M
The mixture was passed through a hot air drying oven at 120°C for 3 minutes. At the final stage, [1-Ler is pressed]
One molding mat of the present invention with a U and FF length of 20 mm was used.

- a length of 300 mm,
+1] 120mm, depth 60mm, curvature cliff diameter of periphery and bottom periphery! A deep-drawn product was produced using a hot stone of 220°C and a pressure of 20K (1/cm' C) for 2 minutes using a deep drawing mold of 1 mm.

1F, 1 product has a thickness of 2.5mm and a density of 190.9
8g, /c'.

The bending strength was 400, the surface was smooth.

For comparison, the moisture content of the same defibrated wood fiber as above is 1.
4゜l11m on 80mm section (dry fiber) of 5% and
Add 20j'rI hanging part of Nokol resin powder - 10 times heavy hanging part and 0.5 parts of paraffin wax to make pine 1 ~ 410mm thick, then
Heat and dry at 150°C for 3 minutes, then press into pine molding material 1 with a thickness of 20 mm. The obtained molding pine 1- has inferior flexibility and low strength Iσ compared to the product of the present invention of 6c. When the molded product was manufactured, it had a thickness of 2.5 mm.

Density 0.9! i(1/咋゛1 bending strength to 300!+/
cm' performance, and cracks were observed in some of the molded products.

Furthermore, for comparison, the powder of 7J nord resin ゎ) was
When molding pine 1 was manufactured under exactly the same conditions except for the m part, the strong spring L was extremely strong in pine 1. When molded, cracks appeared at the corners, and the bending strength was significantly lowered, making it completely impractical.

Claims (1)

[Claims] After steaming and defibrating the main fibers and separating the water vapor, the M fibers (1) are dried and taken out as they are, and the essential fibers have tensile strength. Add and mix 1'6) powdered thermosetting bamboo synthetic resin and powdered or fili Nlt-like thermoplastic bamboo synthetic resin with 1'6) powdered synthetic resin on the surface of the wood fibers to make 1 q of a mixture. 2nd 2 1-culm and the 1st]-culm 151 ':'J the mixture is put into the cotton making machine () (3rd culm with a mat and the mat is 1)
fI heat 11 melting of the plastic synthetic resin 1j, (hereinafter - IC thermosetting 1'1 temperature range C' that does not reach the curing temperature of the synthetic resin)
Fourth king culm J by heating and drying and squeezing the juice: Method for producing wood fiber pine 1 for deep drawing molding characterized by bending 1゜