JP-7856619-B2 - Decking material

JP7856619B2JP 7856619 B2JP7856619 B2JP 7856619B2JP-7856619-B2

Inventors

青木　俊憲
五十嵐司
橋本貴志
稲木祐子

Assignees

フクビ化学工業株式会社

Dates

Publication Date: 20260511
Application Date: 20231012

Claims (6)

A decking material in the shape of a board, which is placed outdoors and extends in the longitudinal direction, Substrate and The upper surface layer portion covers the upper surface of the substrate, The substrate comprises a lower surface layer portion that covers the lower surface of the substrate, The substrate and the upper surface layer are composed of a compound resin containing a resin material and a specific component that exhibits a greater dimensional change in response to water absorption than the resin material. The aforementioned substrate is The upper core layer is covered above by the upper surface layer, A lower core layer is located below the upper surface layer and its lower part is covered by the lower surface layer, It includes a plurality of partition walls interposed between the upper core layer and the lower core layer, which divide the space while forming a space between the upper core layer and the lower core layer, A decking material characterized in that the thickness of the lower core layer is thinner than the thickness of the upper core layer, and the thickness of the upper surface layer is less than or equal to the thickness of the lower surface layer.
The decking material according to claim 1, characterized in that the interface between the upper surface layer and the upper core layer is formed in a wavy shape.
The thickness of the lower core layer is set to a range of 0.2 times or more and 0.6 times or less the thickness of the upper core layer, and The decking material according to claim 1 or 2, characterized in that the thickness of the upper surface layer is set to a range of 0.5 times or more and 1.0 times or less the thickness of the lower surface layer.
The thickness of the upper surface layer is formed to be thinner than the thickness of the upper core layer. The decking material according to claim 1 or 2, characterized in that the thickness of the lower surface layer is formed to be greater than or equal to the thickness of the lower core layer.
The thickness of the upper surface layer is set to a range of 0.3 times or more and 0.6 times or less the thickness of the upper core layer. The decking material according to claim 4, characterized in that the thickness of the lower surface layer is set to a range of 1.0 to 2.0 times the thickness of the lower core layer.
The decking material according to claim 1, characterized in that the lower surface layer does not contain the specified component.

Description

This invention relates to decking material for outdoor installation. Traditionally, decking materials made from materials such as wood and synthetic resin have been used in outdoor structures such as terraces, verandas, boardwalks, and benches. For example, Patent Document 1 discloses a decking material comprising a base material, an upper surface layer covering the upper surface of the base material, and a lower surface layer covering the lower surface of the base material. The base material and the upper surface layer are composed of a wood-powder-containing resin, while the lower surface layer is composed of a synthetic resin without wood powder. The wood powder content of the upper surface layer is smaller than that of the base material. Japanese Patent Publication No. 2018-12976 This is a perspective view showing the deck structure according to one embodiment of the present invention.This is a perspective view showing the decking material used in the above deck structure, individually.This is a cross-sectional view of the decking material shown above.These are experimental results showing the dimensions and warp of the decking material of this embodiment and conventional decking material. [Explanation of deck structure] Figure 1 shows a deck structure according to one embodiment of the present invention. The deck structure shown in this figure is used, for example, as a terrace or boardwalk outdoors, and comprises a plurality of decking materials 1 that constitute the floor surface, a support frame 40 that supports the decking materials 1 from below, and a plurality of base portions 50 that support the support frame 40 in the ground E. [Explanation of decking materials] Next, the detailed structure of the decking material 1 will be described, mainly using Figures 2 and 3. Figure 2 shows a perspective view of the decking material 1, and Figure 3 shows a cross-sectional view of the decking material. As shown in these figures, the decking material 1 is a hollow plate-like member having internal spaces (multiple closed spaces S, which will be described later), and its cross-section as a whole is a flattened rectangle. The decking material 1 has a multi-layer structure and comprises a base material 2, a first surface layer material 3 that covers the top surface and part of the sides of the base material 2, and a second surface layer material 4 that covers the bottom surface and part of the sides of the base material 2. The base material 2 is a hollow member having a ladder-shaped cross-section. Specifically, the base material 2 integrally comprises an upper core layer 10 extending along a horizontal plane, a lower core layer 11 extending parallel to the upper core layer 10 at a position spaced downward from the upper core layer 10, a pair of left and right side walls 12A and 12B connecting the respective widthwise ends of the upper core layer 10 and lower core layer 11 in the vertical direction, and a plurality of partition walls 13 connecting the upper core layer 10 and lower core layer 11 in the vertical direction between the pair of side walls 12A and 12B. As shown in Figure 2, the upper core layer 10, lower core layer 11, side walls 12, and partition walls 13 all extend along the longitudinal direction X. The left and right side walls 12A and 12B of the base material 2 each have recessed grooves V that are recessed toward the center in the width direction of the deck material 1. The first surface layer material 3 integrally comprises an upper surface layer portion 20 that covers the upper core layer portion 10 (upper surface) of the base material 2, and a pair of left and right side surface layer portions 21A and 21B that cover the portions of the left and right side walls 12A and 12B of the base material 2 above the groove portion V. The first surface layer material 3, the upper core layer portion 10, and the side walls 12A and 12B are integrally molded by multi-color extrusion molding. In particular, the interface between the upper core layer portion 10 and the upper surface layer portion 20 is formed in a fine wave pattern, thereby increasing the contact area between the upper core layer portion 10 and the upper surface layer portion 20. As a result, the upper core layer portion 10 and the upper surface layer portion 20 are firmly bonded, and their delamination is effectively suppressed. The amplitude of the waves is set to, for example, approximately 0.2 [mm], and the wavelength of the waves is set to, for example, approximately 1.0 [mm]. The second surface layer material 4 integrally comprises a lower surface layer portion 30 that covers the lower core layer portion 11 (lower surface) of the base material 2, and a pair of left and right side surface layer portions 31A and 31B that cover the portions of the left and right side walls 12A and 12B of the base material 2 below the groove portions V. The second surface layer material 4, the lower core layer portion 11, and the side walls 12A and 12B are