JP2008074039A - Panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the point at issue that the intermediate parts between inner ribs adjacent to each other become cavities in the case where load is applied to a hollow panel having the inner ribs and the upper and under surfaces of the panel are largely deformed. <P>SOLUTION: This panel has a large number of inner ribs almost parallel to each other and a large number of the usual ribs provided almost parallel to each other and almost crossing the inner ribs at a right angle to bridge the adjacent inner ribs. The greater part of the usual ribs are alternately arranged so as to leave the inner ribs and not connected linearly through the inner ribs. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a hollow panel having an inner rib, such as an automotive deck board manufactured by hollow molding a thermoplastic resin.

As a prior art regarding the hollow panel which has an inner rib, there exist some which are disclosed by patent document 1. FIG.
JP 2004-291647 A

Inner ribs, also known as solid ribs or hidden ribs, are drawn out of the parison in the cavity by a slide mechanism or the like immediately after clamping the mold to form the normal ribs in hollow molding. A solid rib is formed by compressing, crushing, and fusing and solidifying the space in the parison of the trace of the core mold member extracted with high-pressure air, and is widely known.

However, since the middle between the adjacent inner ribs of the hollow panel remains a cavity, the method disclosed in Patent Document 1 has a rigidity against bending in a direction perpendicular to the inner rib and a direction in which it does not. There was a drawback that the bending stiffness was greatly different.

This will be described in more detail with reference to FIGS. FIG. 1 is a perspective view of a conventional panel, in which a part of the panel is cut away so that a hollow interior can be seen. 1 is a panel, 2 is a plurality of inner ribs substantially parallel to each other, 11 is an upper surface of the panel, and 12 is a lower surface of the panel.

FIG. 2 shows a cross section AA in FIG. The inner rib 2 is pulled out of a core mold member (not shown) by a known slide mechanism (not shown), and the inner rib 2 is compressed and crushed by high-pressure air at the time of hollow molding, and is fused and solidified. Thus, the fused surface 5 is formed.

FIG. 3 is a modified view when the load F is applied to FIG. 15 is a fulcrum. As can be seen from the figure, the middle of the adjacent inner ribs is a cavity 6, so that the panel upper surface 11 and the panel lower surface 12 are greatly deformed.

The problem to be solved is that when a load is applied to a hollow panel having an inner rib, the middle of the adjacent inner ribs is a cavity, so that the panel upper surface and the panel lower surface are greatly deformed. . The present invention has been made to solve the above-described points.

The present invention is a panel formed by hollow molding of a thermoplastic resin, and includes a plurality of inner ribs that are substantially parallel to each other and a plurality of generally parallel to each other that are substantially orthogonal to the inner ribs and bridge between adjacent inner ribs. The most important feature is that most of the normal ribs are staggered across the inner rib, and most of the normal ribs are not connected in a straight line through the inner rib. To do.

According to the present invention, a panel formed by hollow molding is provided with a plurality of inner ribs that are substantially parallel to each other and a plurality of normal ribs that are substantially perpendicular to the inner ribs and bridge between the adjacent inner ribs. Therefore, even if a load is applied to the panel, the normal ribs are present, so that the upper surface of the panel and the lower surface of the panel are hardly deformed. In addition, most of the normal ribs are staggered with the inner ribs therebetween. Since the normal rib of the portion is not connected in a straight line through the inner rib, a part of the inner rib can be left in the concave portion of the normal rib, and a load is applied to open the concave portion of the normal rib. Therefore, the rigidity against bending in the direction perpendicular to the inner rib and the rigidity against bending in the other direction are not significantly different. There is an advantage in that.

When a load is applied to a hollow panel having inner ribs, the middle between adjacent inner ribs is a cavity, so that the upper surface of the panel and the lower surface of the panel are prevented from being greatly deformed. A plurality of inner ribs and a plurality of normal ribs substantially perpendicular to the inner ribs and substantially parallel to each other between the adjacent inner ribs are provided, and most of the normal ribs are staggered across the inner ribs. In this way, most of the normal ribs are not connected in a straight line through the inner ribs, thereby realizing the economic efficiency of hollow molding.

The configuration of the present invention will be described based on the embodiments of the invention as follows. In addition, the same code | symbol as a prior art example represents the same member.

FIG. 4 is a perspective view of the panel 1 showing an embodiment of the present invention, in which a part of the panel 1 is cut away so that a hollow interior can be seen.

A plurality of inner ribs 2 substantially parallel to each other and a plurality of normal ribs 3 substantially perpendicular to the inner ribs 2 and bridging between the adjacent inner ribs 2, 2, The normal ribs 3 are arranged in a Amida shape.

“Amitabha” here means “a lottery with a different amount written on one end of the parallel line drawn according to the number of people to spend, and each person paying out the amount allocated. Today, between the parallel lines. Non-patent literature: “I often put horizontal lines (because the Amida Buddha's merit is equal, or because the figure of the lottery is radial and resembles the Amida Buddha's afterglow.)” 4, the normal ribs 3 are arranged in a staggered manner with the inner rib 2 interposed therebetween, as shown in FIG. 4, so that the normal rib 3 passes through the inner rib 2. It is not connected in a straight line.
Ojizumi (Shogakukan)

However, it is not necessary that the normal ribs 3 are not connected in a straight line through the inner ribs 2, and the normal ribs 3 are partially connected in a straight line through the inner ribs 2 as necessary. There may be cases. That is, most of the normal ribs are staggered across the inner rib, which means that most of the normal ribs are not connected in a straight line through the inner rib. The “most” here means a majority.

Next, the operation of the present invention will be described. A semi-molten thermoplastic resin parison (not shown) such as polypropylene is suspended in a split mold (not shown), and the split mold is clamped.

The thermoplastic resin applied to the parison is not limited to polypropylene, but polyethylene, other polyolefin resins, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polyamide resins, polyacetal resins, syndiotactic. Any resin that can be hollow molded may be used, such as polystyrene, polystyrene, rubber-modified polystyrene, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, modified polyphenylene oxide, polyphenylene sulfide, and polycarbonate. Further, a composite material obtained by kneading glass fiber, carbon fiber, boron fiber, calcium sulfate powder, calcium carbonate powder, or the like with the thermoplastic resin may be used.

Thereafter, high pressure air is blown into the parison and blown up to complete the hollow molding.

FIG. 5 shows a cross section AA in FIG. Even when a load similar to that in FIG. 3 is applied, the normal rib 3 is present, so that the deformation of the panel upper surface 11 and the panel lower surface 12 is less than that of the conventional example.

6 represents a cross section BB in FIG. By arranging the normal rib 3 in the shape of Amida, the concave portion 4 of the normal rib 3 can leave a part 2 ′ of the inner rib 2, and a load is applied to the concave portion 4 of the normal rib 3. It is possible to prevent a decrease in rigidity due to opening.

As described in the above embodiments, according to the present invention, a panel formed by hollow molding has a plurality of inner ribs that are substantially parallel to each other and substantially parallel to each other that are substantially orthogonal to the inner ribs and bridge between adjacent inner ribs. Since the normal ribs are provided even when a load is applied to the panel, the upper surface of the panel and the lower surface of the panel are hardly deformed. In addition, most of the normal ribs are attached to the inner ribs. Since they are arranged in a staggered manner, most of the normal ribs are not connected in a straight line via the inner ribs, so that a part of the inner ribs can be left in the recesses of the normal ribs, and a load is applied. Therefore, it is possible to prevent a decrease in rigidity due to the opening of the concave portion of the normal rib, so that the rigidity with respect to the bending in the direction perpendicular to the inner rib and the rigidity with respect to the bending in the other direction are not. There is an effect that is different it is not large.

INDUSTRIAL APPLICABILITY The present invention can be used for a panel such as an automobile deck board manufactured by hollow molding a thermoplastic resin.

Perspective view of a conventional panel AA sectional view in FIG. Deformation diagram when load is applied to Fig. 2 The perspective view of the panel based on this invention AA sectional view in FIG. BB sectional view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Panel 2 Inner rib 2 'A part of inner rib 2 3 Normal rib 4 Recessed part 5 Fusion surface 6 Cavity 11 Panel upper surface 12 Panel lower surface 15 Support point F Load

Claims (1)

A panel made by hollow molding of a thermoplastic resin, comprising a plurality of inner ribs substantially parallel to each other and a plurality of normal ribs substantially parallel to each other and substantially perpendicular to the inner ribs and bridging between the adjacent inner ribs. The panel is characterized in that most of the normal ribs are staggered across the inner rib, and most of the normal ribs are not connected in a straight line through the inner rib.