JPS58185249A - Manufacture of surface treating wood - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing surface-treated wood whose surface is treated with vinyl chloride paste.

Surface treatment (strengthening) of wood, such as decorative veneer, has been done by vacuum impregnating the decorative veneer with polyester resin (wp
c method).

However, this method requires a complicated step of vacuum-impregnating the veneer with polyester resin, which poses a problem in that surface treatment is time-consuming. In addition, this method performs surface treatment by impregnating the veneer with a polyester resin in a vacuum, so it was not possible to control the surface hardness of the veneer. Furthermore, the surface treatment must be carried out under constant conditions at all times, resulting in the problem that individual measures cannot be taken during actual operations. Furthermore, since the resin used is solvent-based and has volatile content, it is difficult to work with, and it is difficult to obtain a large violet basis weight with l-coat, and the pot life is short and storage is difficult, making it difficult to handle. had.

This invention was made in view of these circumstances, and its gist is to apply vinyl chloride paste to the surface of wood, and to perform heat-pressure gelling treatment on the surface coated with the vinyl chloride paste. be.

That is, this invention treats the surface of wood by applying vinyl chloride paste (plastisol) to the surface of the wood and subjecting it to heat-pressure gelling treatment, and does not involve the complicated process of vacuum impregnation with resin. The entire process becomes simpler and continuous production becomes possible. Furthermore, the surface hardness of the wood can be easily controlled by adjusting the blend of vinyl chloride paste. Furthermore, according to the present invention, the conditions during surface treatment can be appropriately changed by adjusting the blending of the vinyl chloride paste, etc., so that it is possible to respond easily in actual operations. In addition, since the vinyl chloride paste (plastisol) is solvent-free, it is easier to work with, and a large amount can be obtained with one coat, and it has a long pot life, making it easier to handle. . Furthermore, in this invention, the vinyl chloride paste application surface is subjected to heat-pressure gelation using a hot roll, hot press, etc.
Not only can the surface smoothness be improved, but also the thermal efficiency can be improved, and by applying the uneven processing to the roll etc., it becomes possible to provide the uneven pattern at the same time as the surface treatment.

Next, the present invention will be explained in detail based on examples.

[Example 1] As shown in FIG. 1, a plywood 5 is made by stacking a veneer 2 on an adhesive coated base plate 1 and pressing it with a pair of upper and lower flat molds 3 and 4. As shown in FIG. 2, a primer was applied using a roll coater 6.

The above-mentioned veneer 2 is freshly sliced wet (moisture content 2
It may be a dry method (moisture content less than 20%) or a dry method (moisture content less than 20%). As a primer, urethane type, acrylic type,
Examples include general items such as PVC thread, and items for bonding PVC. In this case, Nippon Zeon 400
Xll0A was used.

Finally, this was placed in a dryer 7 shown in FIG. 3 to dry the primer. However, if the primer is a solvent-free type, this drying step is not necessary. Next, as shown in FIG. 4, a vinyl chloride paste was coated using a roll coater 8 with the coating sensitivity adjusted as appropriate. The composition of the vinyl chloride paste is as follows.

Vinyl chloride paste resin (manufactured by Nippon Zeon, 121)
: 100 parts by weight DAP%/7- (manufactured by Osaka:/-da): 30-40# (Dioctyl 7 tallate (DOP): 10-20
#Tin stabilizer 2 #D
AP reaction initiator: 0.6 to 0.8 #Note that when it is necessary to adjust the viscosity, a diluent and a thickener are added as appropriate.

Next, as shown in FIG. 5, the plywood coated with the vinyl chloride paste was placed in a dryer 9, and the vinyl chloride paste was semi-gelled. This is done in order to increase the number of coating caps for vinyl chloride paste and enable thick coating. This is because if the paste is not semi-gelled in this manner, the paste will flow during the heat-pressure gelling treatment in the subsequent step. However, if the coating lid is small and there is no possibility of flow during the heat-pressure gelling process, it is not necessary to perform semi-gelling. Next, as shown in FIG. 6, a heat pressure gelling treatment was performed using a heat roll 10. The processing conditions are appropriately determined depending on the composition of the vinyl chloride paste. In this case, the temperature was set at 180°C and the pressure cuff was set at about 20K11l/Cd.

In this way, a surface-treated plywood was obtained. This plywood had a hardened layer of hardened vinyl chloride paste formed on its surface, and had extremely high surface hardness and durability. Moreover, even though the hardened layer (5) of vinyl chloride paste was quite thick, the wood grain on the plywood surface was clearly visible through the hardened layer, and the wood texture was not impaired in any way. In addition, the surface of the vinyl chloride paste hardened layer is
During the heat-pressure gelation, contact pressure was applied by the heat roll 1O, so the smoothness was extremely high.

The surface-treated plywood obtained as described above may be sanded with a drum nanter 11 on its surface as shown in FIG. 7 to remove surface defects, as shown in FIG. As shown in the figure, after the paint is applied by a roll coater 12 to form a coating film, it may be placed in a dryer 13 to be dried, as shown in FIG. Note that this drying step is not necessary when using a solvent-free paint.

[Example 2] In Example 1, vinyl chloride paste was applied to the surface of the plywood, but in this example, vinyl chloride paste was applied to the surface of the veneer to semi-gel, and then applied to the adhesive-coated base plate. They were stacked together and hot pressed to simultaneously heat-pressure gel the salt (6) vinyl paste (hereinafter abbreviated as "PVC paste") and gel the adhesive.

That is, as shown in FIG. 10, the same primer 1 used in Example 1 is applied to the surface of the veneer 14 using a roll coater 15.
6 was applied and then dried through an air curtain until no liquid floated on the surface of the veneer 14. Next, as shown in FIG. 11, a PVC paste having the same composition as used in Example 1 was applied using a roll coater 17, and then placed in a dryer and heated at 120 to 140°C for 2 to 3 minutes. The PVC paste was semi-gelled. During this drying, moisture in the veneer is also removed at the same time. In addition, the cracks in the veneer,
This can be prevented by applying tension to the veneer. On the other hand, as shown in FIG. 12, adhesive is applied to the surface of the plywood 18 using a roll coater 19, and as shown in FIG. 21 Heat pressure (150-180℃
, 10-15? Ad), and heat-pressure gelation of the PVC paste was performed simultaneously with adhesion. In this case, the pressing surface of the press plate 22 of the hot press 21 is a bell plate, a matte finish release paper,
By constructing it with a plain embossed board or the like, it is possible to create a beautiful surface appearance. In this way, a surface-treated plywood having the same excellent performance as in Example 1 was obtained.

In this embodiment, the heat-pressure gelling of the vinyl chloride paste can be performed simultaneously with adhesion, so that the process can be shortened.

[Example 3] In this example, as shown in Figure 14, the same primer as in Example 1 was applied to the surface of the veneer 23 using a roll coater 24 and dried, and then the same primer as in Example 1 was applied as shown in Figure 15. In this state, as shown in Fig. 16, the same PVC paste as in Example 1 was applied to the surface of the veneer 23 using the Lt coater 26, and then dried in a dryer. After putting the PVC paste into a semi-gelatinous container, as shown in FIG. 17, it is put into a hot press to perform main adhesion and heat-pressure gelling of the PVC paste, thereby producing surface-treated plywood.

Note that if the veneer 23 is severely damaged when the primer is applied to the surface of the veneer 23 and dried, this drying may be performed after temporary adhesion.If the primer is solvent-free, This drying step is unnecessary.

This example is substantially the same as Example 1, except that the veneer and the plywood are temporarily bonded and then the PVC paste is applied, and the effects are also the same.

[Example 4] This example is the same as Example 3 except that the primer is applied to both sides of the veneer using a 5-layer coater or dipping.
It is similar to

In this way, by applying the primer not only to the front surface of the veneer but also to the back surface, the adhesion to the plywood is further improved.

[Example 5] In this example, after temporarily adhering the veneer to the plywood, the same primer as in Example 1 was applied to the surface of the veneer and dried, and then the same PVC paste as in Example 1 was applied. Surface-treated plywood is manufactured by applying it to a hot press.

(9) This example also has the same effects as Example 3.

Note that the device used for applying the primer and the PVC paste is not limited to a roll coater, and other devices such as a reverse coater and a flow coater may be used. Alternatively, brush painting or the like may be used.

As described above, in this invention, the PVC paste is applied to the surface of the wood, and the heat-pressure gelling process is applied to the surface coated with the PVC paste, so the process is extremely simple and continuous production is possible. . Furthermore, the surface hardness of the wood can be easily controlled, and the surface treatment conditions can be changed as appropriate to suit the actual situation. In addition, since the PVC paste is solvent-free, it is easier to work with, and a large amount of lid can be removed with one coat.The PVC paste has a long pot life and can be stored easily, making it easy to handle. This makes the work easier. In addition, it is possible to apply thick coatings without compromising transparency or wood texture.

(lO) In this invention, instead of drying in an atmosphere, heat-pressure gelation is performed using a method using contact heat using a hot roll, hot press, etc., so it is possible to improve thermal efficiency and improve surface smoothness. . Furthermore, by subjecting a hot roll or the like to uneven processing, surface processing such as formation of an uneven pattern can be performed at the same time as heat-pressure gelling.

[Brief explanation of the drawing]

Figures 1 to 6 are explanatory diagrams of one embodiment of the present invention, Figures 7 to 9 are explanatory diagrams of the case in which additional processing is applied to the surface-treated plywood obtained in this way, and Figure 10. FIGS. 14 to 13 are explanatory diagrams of other embodiments, and FIGS. 14 to 17 are explanatory diagrams of further δ and other embodiments. 1.18... Base plate 2,14... Single plate 3,4...
・Flat type 5...Plywood 6, 8, 12, 15, 17.1
9...Roll coater 7.9.13...Dry! [10
...Heat roll 11...Drum sander 20...
・Salt hypaste semi-gelled veneer 21... Hot press 22... Press plate (11) Figure 1 Figure 4 Figure 7 Figure 2 Figure 3 0 Figure 5 Figure 6 Figure 8 Figure 9 Figure 10 Figure 11 Figure 13 Figure 14 Figure 15 Figure 6 ↑ Figure 16 Figure 17 247-

Claims (1)

[Claims] (1) A method for producing surface-treated wood, which comprises applying vinyl chloride paste to the surface of wood, and subjecting the vinyl chloride paste-coated surface to a heat-pressure gelling treatment.