JPS5968201A - Veneer containing thread - 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 spare veneer. The purpose is to prevent various gaps that exist in left-over veneers, and to provide a left-over veneer that has the property of closing the gaps even if they occur.

Conventionally, there are various types of leftover veneers in which cuts are formed in a direction perpendicular to the veneer fibers, and the veneers are reinforced or joined using thread or a combination of thread and adhesive within the cuts.

For example, Special Publication No. 51-1764, Special Publication No. 54-892
5 to Special Publication No. 54-8927, Special Publication No. 54-169
No. 89, Special Publication No. 1864, Special Publication No. 55-108.
No. 61, Special Publication No. 55-28522, Special Publication No. 65-28
No. 527, Special Publication No. 55-85180, Special Publication No. 55-4
No. 5010, Special Publication No. 55-46284, Special Publication No. 55-
46285, Japanese Patent Publication No. 56-1076f11, Japanese Patent Publication No. 56-17202, Japanese Patent Publication No. 56-51081, and other publications are publicly known.

However, in any of the above-mentioned known veneers, the threads embedded in the cuts were threads whose plastic elongation accounted for most of the threads.

Once a gap occurs in the veneer, the gap remains without closing. In other words, in the state shown in FIGS. 1 and 2, the leftover veneer has poor appearance, such as unevenness in the surface of the hole 1 when viewed from the outside, and the quality of the plywood deteriorates all at once. It is. Incidentally, the occurrence of such gaps is caused, for example, in the case where the veneer is a so-called green veneer before drying, by the shrinkage phenomenon accompanying drying, or in the case of a bonded veneer made of a plurality of veneers.

Gaps caused by intermittent operating machines, speed differences during the conveyance process (caused by breakage, single cracking, etc.).

Therefore, 1) the present invention improves the properties of the thread insertion veneer itself in order to prevent the occurrence of gaps that are accompanied by a decrease in quality 1 and yield as described above, and 2) even in processes where gaps occur, The purpose is to provide a thread insertion veneer having a characteristic that the gap closes immediately, and the details thereof are as follows.

First, the outline of the thread inserting veneer of the present invention will be explained based on the diagram in FIG. 3 as follows.

In the figure, the thread inserting veneer 6 has a cut 7 extending in a direction perpendicular to the fiber direction of the veneer 6, and a thread inserter made of spantex yarn 8 embedded in the cut in a stretched state. It is made of veneer.

Here, 1 veneer is used, but it can be made of any veneer such as green veneer, dried veneer, and even tenderized veneer.

Further, the cut may be one extending one length in the direction orthogonal to the fiber direction of the veneer, as illustrated in FIGS. 4 to 7, and there is no restriction on the cross-sectional shape thereof. for example.

Any of the incisions according to the above publication and Japanese Patent Application Laid-open No. 118804/1986 may be used.

Next, the spantex yarn, which is a feature of the present invention, will be explained in detail.

11 Regarding the above-mentioned spandex yarn, it is a yarn in which elastic elongation occupies the majority, as defined in 5, for example, Polyurethane Resin and Plastic Materials Course (written by Keiji Iwata) published by Nippon Kogyo Shinbunsha. Broadly speaking, there are monofilament types and multifilament types.

1 For example, in Fig. 8 (the monofilament type shown in this example is
It is a single long elastic thread. In Japan, the product name is Mohilon Code 20 MC-20, MC-8 manufactured by Nisshinbo.
0, MC-40, MC-50, etc. Also, Toyobo,
It is also manufactured by Fujibo and other companies.

On the other hand, the multifilament type.

Consists of long elastic threads made up of multiple or multiple threads.

In addition, Figures 10 to 13 show the above multifilament type made of cotton, nylon 1 acetate, Ohrono 1 tacro/
Spandex yarn with single or double covering. Of course, you can use a monofilament type spandex covering.

Spandex yarn and other yarns may be used together in m rows as shown in FIG. 14 without covering.

It is also possible to use the spandex yarn described in 1 above by adhering or impregnating it with any adhesive such as a wet adhesive.

Also, the thickness of the spandex thread used in this case is selected depending on the thickness of the veneer, but according to experiments, it is preferable to use something between 250 and 10,000 denier. In case of thickness l MH, 25
In the case of 0 to 3000 tenier, 4 tomo (this is 2000 to
Approximately 10,000 denier is appropriate.

Of course, the thickness of the thread is also selected depending on the number of cuts to be made. The key is to use a veneer with a thickness that has the strength required for the thread insertion veneer.

Next, there is a method of stretching the spandex yarn. For example, as shown in Figure 10, if force is applied to both ends of the spandex yarn, the spantex yarn will be stretched and have a diameter smaller than its original diameter. . Moreover, spantex yarn has the characteristic of always trying to return to its original state.Therefore, the elongated state in this application refers to the above state. Describe using.

For example, the characteristics of the MC-50 are experimentally shown in FIG. 0% elongation means free length.

Furthermore, 100chi indicates the state when each of the above threads is stretched and broken. Therefore, in the threaded veneer of the present invention, it is desirable to use the spandex yarn at an elongation state of 70 to less than 1.0% as shown in the graph. Of course, the characteristics of the multifilament type or the covered one type are somewhat different, and the point is that it can be used within a range of elongation that instantly closes various gaps such as cracks and breaks, which is the object of the present invention.

Next, regarding the method of embedding the spandex thread in an elongated state into the incision, the simplest method A73 is to supply the spandex thread, which has been stretched into an elongated state, to the incision tool.

For example, as shown in FIG. 16, the thread gauge 19 acts as a resistance to the cutting blade while forming an extended state, and the cutting blade is supplied with spantex. Taking advantage of the fact that when the thread is stretched, it has a diameter smaller than the outer diameter when it is free length, the threading hole of the cutting blade is slightly smaller than the outer diameter when the spandex thread is free length. There is also a method of inserting it and embedding it in the notch.

As described above, the yarn-inserted veneer of the present invention can be used in the direction perpendicular to the fiber direction (
This is a thread insertion veneer made by embedding spantex thread in a stretched state within the extending cut. In other words, since the spandex yarn is embedded in the cut in the direction in which it extends, tension is always present in the spandex yarn (this prevents cracks, breaks, and gaps between the joints of multiple sheets, etc., from closing. As mentioned above, even if a single spandex thread is abraded, it will immediately try to return to its original shape, so the spandex thread itself will shrink, preventing gaps between each column and maintaining the joint reinforcement effect. Preventing quality deterioration.

Furthermore, FIGS. 17 to 19 show the surface of a dried veneer (I coveneer veneer using stretched spantex yarn and thermoplastic adhesive together).

For example, Figure 17 shows a veneer veneer in which the above-mentioned spantex threads are stretched and reinforced using the apparatus disclosed in Japanese Patent Publication No. 58-80771. Equipped with a device to detect various gaps such as cracks and breaks.

The elongated fm + strained spantex yarn is inserted into a hot melt tank and reinforced and bonded. If the detector detects the various gaps, the pot melt adhering to and impregnating the spandex yarn is removed from the hot melt tank and the veneer veneer is reinforced and bonded. Of course, when the detector is not used as a signal, it is attached to spandex yarn using a cooling roll, impregnated, and then hot melted and bonded using a conventional technique.

Moreover, FIG. 18 shows a veneer veneer made of a plurality of sheets joined together. As mentioned above, using the device disclosed in Japanese Patent Publication No. 53-80771, the detection signal at the time of sizing cutting is used to determine the effect of preventing pot melt from adhering or impregnating the joints of adjacent veneers. It is true.

Also, unlike FIGS. 17 to 18, FIG. 19 shows a veneer veneer in which melted hot melt is beaded at the joint, and hot melt is applied over the entire length of stretched spandex thread to reinforce and bond it. In other words, the aforementioned Special Publick 1973-
In the veneer selected by January 8077, if spandex with stretched threads is used and a cutting detection signal is used to create a melted part of the bead, it will be possible to create a melted part of the bead while the hot melt is melting. Even if there is a gap, it will try to close it immediately.Also, even if it is pressed and bonded with a conventional cooling roll, the area near the surface will be cooled, but the area near the bead veneer at the joint will be melted and the gap will be closed. I'm trying to do that.

2. The present invention is a yarn-inserted veneer which has an extremely simple structure, and is made by utilizing the physical properties of spandex yarn and embedding it in an elongated state in a cut extending perpendicularly to the fibers of the veneer. There are many rational improvements such as synchronization of factory reeling, unwinding, and intermittent machinery, etc. 1 and prevention of layup breakage, which greatly improves yield and productivity compared to conventional methods.

[Brief explanation of the drawing]

Fig. 3 is a perspective view of an embodiment of the present invention, Figs. 4 to 7 are partial views of the embodiment, Figs. 8 to 14 are partial views of the embodiment of the invention, and Fig. 16 is an embodiment of the invention. 17 to 19 [& is a plan view of the embodiment of the present invention, and FIG. 20 is a side view of FIG.
FIG. 3 is a partial side view of the figure. 6... Thread insertion veneer, 6a... veneer, 7... cut,
8... Spandex thread, 9... Thread game 1-, 10
... Cutting blade, 11... Crack, 12... Hosotomel I-, 18... Beads. Patent applicant Meinan Seisakusho Co., Ltd. Figure 7 Figure 6 Figure 8 Figure 1 ←--- Figure 9 Figure 10 Figure 1---+ Figure 11 Figure 12 Figure 14 Figure 16 Figure 15 Figure 20 Supplementary Procedure iE (Method) Toshio Wakasugi, Commissioner of the Patent Office, February 6, 1982 1 Indication of the case 1980 Patent Application No. 180337 2, Title of the invention 3 Relationship with the person making the amendment Patent Applicant postal number 474 Telephone (0562) 47-22
116 Contents of the amendment As shown in the attached sheet, in the specification --- "Figure 3 shows the embodiment of the present invention..." in line 1 on page 11 to line 6 on page 11・・・・・・・・・・・・
...The additional drawing is a partial side view of Fig. 19. 1 Figures 1 and 2 are partial perspective views of the conventional Yojin Jt veneer, Figure 3 is a perspective view of the thread inserting veneer of the present invention, and Figures 4 to 7 are enlarged explanations of the cuts. Figures 8 to 14 are partial perspective views of spandex threads, Figure 15 is a characteristic diagram of some spandex threads, Figure 16 is a schematic explanatory diagram illustrating the method of embedding spandex threads, and Figure 17 is a partial perspective view of spandex threads. 19 to 19 are schematic plan views of the veneer veneer, and the additional drawing is a schematic side view of the joint portion shown in FIG. 19. ” he corrected.

Claims (1)

[Claims] A veneer characterized by having spandex yarn embedded in a stretched state in a cut extending in a direction perpendicular to the fiber direction of the veneer.