JP5460129B2 - Venting rim - Google Patents

Description

  The present invention relates to a ventilation trunk edge that is disposed so as to form a ventilation space between an outer wall material and a base material.

  Such ventilating trunk edges are well known in Patent Documents 1 and 2 below. Patent Document 1 discloses a ventilation trunk edge having a ventilation groove having a circular arc shape in cross section, and Patent Document 2 discloses a ventilation trunk edge having a U-shaped ventilation groove in cross section. If the trunk edge for ventilation as described in these patent documents is installed in parallel with a gap between the outer wall material and the base material, the vertical direction between the trunk edges when the trunk edge is constructed in the vertical direction. The air passage is also formed in the horizontal direction through the ventilation groove on the trunk edge, and when the trunk edge is constructed in the horizontal direction, a horizontal ventilation path is formed between the trunk edges. At the same time, a ventilation path is also formed in the vertical direction via the ventilation groove on the trunk edge, so that the ventilation path is secured in both the vertical and horizontal directions regardless of the construction direction of the trunk edge, and an outer wall structure excellent in heat insulation effect is obtained. There are advantages that can be made.

JP-A-5-5330 JP 2003-20738 A

  Generally, structural plywood is used for the body edge. However, if there are cracks or nodes in the veneer that constitutes the structural plywood, the strength of the part at the body edge will decrease, so the load of the outer wall material will act or be transported. It is easily damaged when the ventilating rim is deformed. In addition, the veneer constituting the structural plywood includes a veneer having a fiber direction along the longitudinal direction and a veneer having a fiber direction along the short side direction. The veneer veneer with weak resistance is easily damaged. Furthermore, when a nail is driven into the ventilation trunk edge to fix the outer wall material, the single plate is likely to crack due to the fiber orientation of the single plate constituting the structural plywood. If the single plate is damaged or cracked due to these reasons, there is a risk that the ventilating trunk edge will be destroyed.

  In addition, in order to provide a sufficient space for the air passage in the direction orthogonal to the trunk edge construction direction, a large number of ventilation grooves can be formed by increasing the cross-sectional area of the ventilation grooves formed on the trunk edge or by narrowing the intervals between the ventilation grooves. However, if this is done, the strength of the ventilating rim will be reduced and the load on the outer wall material will be applied, or when the ventilating rim will be deformed during transportation, etc. Can easily break or break at the bottom of the ventilation groove.

  In addition, in order to form a ventilation groove on the ventilation trunk edge, a method of partially cutting one or both sides of a base material such as a structural plywood or a solid material to form a ventilation groove, A method of adhering a belt-like plate having a rectangular cross section at an interval is employed, but all of them require labor.

  Therefore, the problem to be solved by the present invention is that the strength is increased so that the outer wall material is not damaged or broken due to deformations during transportation or due to deformation during transportation, and sufficient ventilation performance is achieved by simple processing. An object of the present invention is to provide a ventilating rim having a novel configuration capable of ensuring the above.

In order to solve this problem, the present invention is a ventilation trunk arranged so as to form a ventilation space between an outer wall material and a base material, in which a wood fiber mixed with an adhesive is hot-pressed. A ventilation groove is formed by partially compressing one side or both sides of a wood fiberboard formed as a three-layer structure comprising a center layer and front and back layers formed at a higher density than the center layer by molding. The average density of the ventilation groove forming portion is formed to be larger than the average density of the ventilation groove non-forming portion, and the density of the front and back layers in the ventilation groove forming portion is higher than the density of the front and back layers in the ventilation groove non-forming portion. It is characterized by.

  This ventilating rim is a ventilation groove to be formed between a press board and a fiber mat when a fiber mat made by mixing a wood fiber with an adhesive is hot-pressed with a press board to produce a wood fiber board. A wood fiber board with a ventilation groove formed in the width direction is manufactured by interposing a wide member corresponding to the cross-sectional shape and dimensions of the sheet in the ventilation groove formation location or by integrating it with a press board by hot pressing. Then, it can be formed by cutting with the width of the ventilating trunk edge. Alternatively, after producing a wood fiber board by hot pressing a fiber mat in which wood fiber is mixed with an adhesive with a press machine, the wood fiber board is subjected to hot press molding again with the press machine. A wide member corresponding to the cross-sectional shape and dimensions of the ventilation groove to be formed is interposed between the plate and the hot groove formed in the ventilation groove forming portion, or integrated with the press board, over the width direction. After manufacturing the wood fiber board in which the ventilation groove | channel was formed, you may form by cut | disconnecting by the width | variety of the trunk | drum edge for ventilation | gas_flowing.

  According to the present invention, the ventilating body edge is formed of a homogeneous wood fiberboard having no cracks and no knots and no fiber orientation, so that it is a single plate like a conventional ventilation body edge formed of a structural plywood. There is no concern about breakage or breakage due to cracks, joints or fiber orientation.

  Further, a ventilation groove is formed by partially compressing one or both surfaces of the wood fiber board. As a result, the density of the wood fiber at the bottom of the ventilation groove is the density of the portion where the ventilation groove is not formed. Since it is larger, even if the bottom of the ventilation groove is thin, sufficient strength is secured to prevent breakage and destruction. Therefore, the depth of the ventilation groove can be increased to ensure sufficient ventilation performance, and even in that case, the ventilation groove edge in which the ventilation groove of the same depth is formed in structural plywood or solid wood, etc. Compared with the strength, it is difficult to break or break.

  Furthermore, according to the present invention, since the ventilation groove can be formed by compression with a press board, it can be easily manufactured without requiring labor such as cutting as in the prior art. In particular, according to the method in which a member is interposed between the press board and the fiber mat in the manufacturing process of the wood fiber board or is integrated with the press board, the wood having a ventilation groove by one-time hot-pressure molding. The fiberboard is manufactured, and it is possible to obtain the ventilation trunk edge of the present invention only by adding a post-process for cutting at the width of the ventilation trunk edge. In addition, an adhesive is used when hot pressing the wood fiber mat. Since the ventilation groove can be compression-formed while being cured, a dense and strong ventilation trunk edge can be efficiently produced at low cost.

It is the side sectional view (a), the top view (b), and the enlarged side sectional view (c) of the trunk edge for ventilation by one embodiment of the present invention. It is a sectional side view which shows the density distribution state of each place in this trunk | drum edge. It is a sectional side view which shows the example of a shape of the ventilation groove | channel formed in the trunk | drum edge for ventilation | gas_flowing. It is outer wall sectional drawing which shows an example of the use condition of this trunk edge for ventilation | gas_flowing. It is explanatory drawing which shows the point of the bending fracture test done about the test piece of the trunk edge for ventilation by this invention Example and a comparative example.

  FIG. 1 shows a ventilation trunk edge according to an embodiment of the present invention. The overall shape of the ventilating body rim 1 is substantially a plate-like strip shape, generally having a width of about 30 to 200 mm, a thickness of about 10 to 30 mm, and a length of 3650 mm. Used by cutting.

  Ventilation grooves 2 are formed on one surface of the ventilation trunk edge 1 in the width direction at equal intervals. The ventilation groove 2 is generally formed to have a width of 400 mm or less and a depth of 50% or less of the thickness of the ventilation trunk edge 1. The arrangement interval of the ventilation grooves 2 is generally about 50 to 500 mm. The cross-sectional shape of the ventilation groove 2 is arbitrary, and in this embodiment, the ventilation groove 2 is shown as a ventilation groove 2 having a rectangular cross section, but can be formed in various cross-sectional shapes as will be described later. Further, in this embodiment, the ventilation groove 2 is formed on one surface of the ventilation trunk edge 1, but it may be formed on both surfaces.

  This ventilation trunk edge 1 is formed between a press board and a fiber mat when (1) a fiber mat obtained by mixing a wood fiber with an adhesive is hot-pressed with a press board to produce a wood fiber board. Wood with a ventilation groove formed in the width direction by interposing a wide member corresponding to the cross-sectional shape and dimensions of the ventilation groove to be inserted in the ventilation groove formation location or by integrating with a press board by hot pressing A method of forming a fiberboard by cutting it with the width of the ventilating trunk edge, or (2) hot pressing a fiber mat in which an adhesive is mixed with wood fibers into a press board to produce a wood fiber board. After manufacturing, when this wood board is hot-pressed again on the press board, a wide member corresponding to the cross-sectional shape and dimensions of the ventilation groove to be formed is formed between the press board and the wood fiber board. Intervened at the location or integrated with the press By thermocompression molding, after manufacturing a wood fiber board which vent groove is formed across the width direction, it may be formed by any of the methods of cutting with a width of ventilation furring strips. In particular, according to the method (1), a wood fiber board having a ventilation groove is manufactured by one hot press molding, and the ventilation trunk edge of the present invention is simply added by a post-process for cutting at the width of the ventilation trunk edge. In addition, when the wood fiber mat is hot-press molded, the ventilation groove 2 can be compression-formed while curing the adhesive, so that the dense and strong ventilation trunk edge 1 can be produced at low cost. This is a preferred method that can be efficiently produced.

In the production of wood fiberboard, wood fibers obtained by degreasing and softening wood chips made of one or more kinds of softwood and / or hardwood materials by steaming with high-temperature and high-pressure steam and degreasing softening In addition, one or more types arbitrarily selected from thermosetting adhesives such as urea resin, phenolic resin, melamine resin, urethane resin or their modified resins, isocyanate adhesives, and synthetic rubber adhesives Are added and mixed, and a wood fiber board is produced according to a conventional method. The density of the wood fibers in the wood fiber board produced in this way is, for example, an average density of 0.6 to 0.8 g / cm ³ , but as is well known, the front and back surfaces have a relatively high density (for example, 0.7 to 1.0 g / cm ³ ) is formed, and the central layer has a relatively low density (for example, 0.5 to 0.7 g / cm ³ ).

In the manufacturing process of the wood fiber board (the method of (1) above) or in the hot-pressure forming process after manufacturing the wood fiber board (the method of (2)), a partially compressed portion is used as the ventilation groove 2 Since it is formed, the density of the wood fiber increases at the bottom of the ventilation groove 2 (the ventilation groove forming portion 21) . That is, in FIG. 2, since the density of the wood fiber in the original wood fiber board is left as it is in the portions where the ventilation groove 2 is not formed (the ventilation groove non-formation portions) 22 and 22, the average density in the above example 0.6 to 0.8 g / cm ³ , the front and back layers 22a and 22a have a relatively high density (for example, 0.7 to 1.0 g / cm ³ ), and the center layer 22b has a relatively low density (for example, 0.5 to 0.7 g / cm ³ ), but the ventilation groove forming portion 21 formed by being compressed from the surface side has a wood fiber density greater than the ventilation groove non-forming portions 22 and 22, and in particular Since the center layer, which was originally relatively low in density, is greatly affected by compression, it is almost the same as the front and back layers 22a, 22a in the ventilation groove non-formed portions 22, 22 (0.7 to 1.0 g / cm ³ ). Until densified Next layer 21b, it is possible to increase the front and back layers 21a, the average density of the whole including the 21a example up 0.9~1.1g / cm ^3.

  FIG. 4 is a cross-sectional view of the outer wall showing an example of the use state of the ventilating trunk edge 1. A ventilation cylinder is provided between the outer wall material 5 and the columnar material 3 as a base material provided with a moisture-permeable waterproof sheet 4. Edge 1 is installed. In FIG. 4, the ventilation trunk edge 1 is constructed so that the ventilation groove 2 faces the outer wall material 5 side. However, the ventilation groove 2 may be constructed so that the ventilation groove 2 faces the moisture-permeable waterproof sheet 4 side. Further, in FIG. 4, the ventilation trunk edge 1 is constructed in the vertical direction so as to form a vertical ventilation path between the ventilation trunk edges 1 and also to provide a horizontal ventilation path via the ventilation groove 2. However, the ventilation trunk edge 1 is constructed in the horizontal direction so that a horizontal ventilation path is formed between the ventilation trunk edges 1 and a vertical ventilation path is also provided through the ventilation groove 2. Anyway.

  As described above, the cross-sectional shape of the ventilation groove 2 formed in the ventilation trunk edge 1 is arbitrary, and some typical shapes are shown in FIGS. The ventilation groove 2a shown in FIG. 3A has substantially the same rectangular cross-sectional shape as the ventilation groove 2 in the ventilation trunk edge 1 of FIG. 1, and is below the side surfaces 24, 24 substantially orthogonal to the surface 23. The bottom surface 25a formed on the bottom surface 25a is formed so as to have a flat surface, but the ventilation groove 2b shown in FIG. 3 (b) has a concave bottom surface 25b formed below the side surfaces 24, 24 substantially perpendicular to the surface 23. The ventilation groove 2c shown in FIG. 3C has a curved bottom surface 25c formed below the side surfaces 24, 24 substantially orthogonal to the surface 23. In these ventilation grooves 2a, 2b and 2c, the upper corner portion formed by the surface 23 and the side surface 24 and the lower corner portion formed by the side surface 24 and the bottom surfaces 25a, 25b and 25c are formed in a curved shape, and the ventilation grooves 2b and 2c are formed. Then, since the bottom surfaces 25b and 25c are also formed to have curved surfaces, there is an advantage that even if deformed during transportation, the stress is not concentrated but dispersed and the ventilating trunk edge 1 is difficult to break.

  The ventilation groove 2d shown in FIG. 3 (d) has a rectangular cross section like the ventilation groove shown in Patent Document 2, and the ventilation groove 2e shown in FIG. The ventilation groove 2f shown in FIG. 3 (f) has a chamfered shape, and further has a lower corner formed in a curved shape. By making the upper corner portion chamfered like the ventilation grooves 2e and 2f, the upper corner portion is not caught by a structure or the like during transportation of the ventilating trunk edge 1 and the safety is improved. Prevent breakage of corners. Further, the ventilation groove 2g shown in FIG. 3 (g) is formed to have an arc-shaped bottom surface 25g as in the ventilation groove shown in Patent Document 1. In the ventilation groove 2f, the lower corner portion is formed in a curved surface, and the ventilation groove 2g has a curved bottom surface 25g, so that stress is not concentrated even if it is deformed during transportation as described above. Thus, there is an advantage that the ventilating trunk edge 1 is difficult to break.

  The wide member used to form the ventilation grooves 2e and 2f has a shape including an inclined surface with an inverted trapezoidal cross section in a part of its cross sectional shape. Therefore, the upper inclined surface 26 of the side surface 24 of the ventilation grooves 2e and 2f is formed by being compressed by the inclined surface of the inverted trapezoidal cross section of the wide member forming the ventilation groove. The inclined surface 26 on the upper side of the side surface 24 is formed by being compressed in a direction perpendicular to the inclined surface 26. Therefore, the density of the wood fiber is increased and the strength is increased. It is possible to prevent damage even if it collides with the other. Moreover, since a corner | angular part becomes an obtuse angle, it can make it hard to break.

In a process for producing a wood fiber board by a conventional method, a substantially flat strip-like strip as shown in FIG. 1 is formed by a method of cutting a predetermined width after forming a ventilation groove 2 by compression on one surface (method (1)). A ventilation waist 1 was obtained. The width was 45 mm, the thickness was 18 mm, and the length was 3650 mm. The ventilation groove 2 has the shape shown in FIG. 3A, and has a width of 180 mm and a depth of 5 mm, which are arranged at equal intervals of 152 mm in the length direction of the ventilation trunk edge 1. The average wood fiber density at the ventilation groove bottom portion 21 of the ventilation trunk edge 1 was 1.0 g / cm ³ , and the average wood fiber density at the ventilation groove non-formed portions 22, 22 was 0.7 g / cm ³ .

On the other hand, except for the fact that a wood fiberboard was manufactured without forming a ventilation groove by compression and then a ventilation groove by cutting was formed on one side thereof, the ventilation trunk edge having the same shape and size as in the above embodiment To obtain a comparative example. The average wood fiber density of the ventilation trunk edge according to this comparative example was 0.7 g / cm ^{3 both} at the ventilation groove bottom and at the ventilation groove non-formed part.

  The ventilating rims of these examples and comparative examples were cut to a length of 320 mm so that one ventilation groove was positioned at the center, and test pieces were subjected to a bending fracture test. As shown in FIG. 5, each test piece is placed on a fulcrum arranged at a distance of 270 mm between fulcrums, and a load P is applied to the center between the fulcrums (hence, the center of the ventilation groove) to break the load (maximum breakage). When the load) was measured, the test piece of the example had a maximum breaking load of 98.2 kgf, whereas the test piece of the comparative example had a maximum breaking load of 23.2 kgf. From this result, the ventilation trunk edge according to the present invention in which the ventilation groove is formed by compression has a significantly higher bending strength than the conventional ventilation edge having the ventilation groove formed by cutting, and is bent about 4 times. It was confirmed that it exhibited strength.

  Further, when a bending fracture test was conducted in the same manner for a test piece of the same size in which no ventilation groove was formed, the maximum fracture load was 109 kgf. When this numerical value is compared with the maximum breaking load of 98.2 kgf of the test piece of the embodiment of the present invention in which the ventilation groove is formed by compression, the strength is reduced only about 10%, and the ventilation groove by compression is formed according to the present invention. However, it was confirmed that it does not cause an extreme decrease in strength.

DESCRIPTION OF SYMBOLS 1 Venting trunk edge 2,2a-2g Ventilation groove 21 Bottom part 21a of ventilation groove Front and back layer 21b in bottom part of ventilation groove 22 Center layer 22 in bottom part of ventilation groove Part where ventilation groove is not formed (part where ventilation groove is not formed)
22a Front and back layers 22b in the portion not formed with the ventilation groove 23 Center layer 23 in the portion where the ventilation groove is not formed Surface 24 of the ventilation trunk edge Side surfaces 25a to 25g of the ventilation groove 26 Inclined surface of the upper corner of the ventilation groove

Claims (1)

It is a ventilation trunk arranged so as to form a ventilation space between an outer wall material and a base material, and a mixture of wood fiber and an adhesive is hot-pressed to form a center layer and the center layer. One side or both sides of the wood fiber board formed as having three layers of the front and back layers formed at a high density are partially compressed to form a ventilation groove, and the average density of the ventilation groove forming part is the ventilation groove A ventilating body rim characterized by being formed larger than the average density of the non-formed portion and having a density of the front and back layers in the vent groove forming portion larger than the density of the front and back layers in the vent groove non-formed portion .

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