JP3214002U - Foamed resin joined body and core material for vehicle bed using the same - Google Patents

Abstract

The present invention relates to a foamed resin joined body 100 in which plate-like foamed resin molded bodies 10 and 20 are joined together via a joining region 40, and a step that causes discomfort to the user is produced at the joint. Do not. SOLUTION: A foamed resin joined body 100 in which two or more plate-like foamed resin molded bodies 10 and 20 are joined to each other via a joining region 40, the joining region of the foamed resin molded bodies 10 and 20 being joined together. 40 includes a gap P in the thickness direction capable of absorbing a shape change such as unevenness generated on the joint surface, and the gap P is filled with an adhesive, and at least the foamed resin joined body 100 is provided. The level difference at the joint between the foamed resin molded bodies 10 and 20 on one surface is 3% or less of the thickness of the joining region 40. [Selection] Figure 1

Description

  The present invention relates to a foamed resin joined body in which plate-like foamed resin molded bodies are joined to each other via a joint portion, and a core material for a vehicle bed using the foamed resin joined body.

  For example, a foamed resin molded body is often used as a core material for a vehicle bed used in a large truck or the like. A large-sized foamed resin molded body such as a vehicle bed core is usually formed by foaming a plurality of foamed resin molded bodies and bonding them together to form one final product. In addition, in the case of a product that requires that the surface on which the person lies beside, such as a vehicle bed core, a step should not be created at the joint between the members. Is required.

  Patent Document 1 describes an example of a large foam molded article that does not cause a step at the joint. There, for example, an adhesive is applied to each side end face of two foam blocks formed by molding or extruding foam particles made of polystyrene-based resin, and joined to make a joined foam block, The bonded foam block is cut at a cut surface that intersects the bonded surface using heat rays to obtain a bonded foam molded plate. By doing so, it is described that the level difference of the joint surface portion can be 0.5 mm or less.

JP 2003-213803 A

  In the bonded foam molded plate described in Patent Document 1, the contact surface where the two end faces of the two foam blocks are in contact with each other is a bonded portion, and the bonding strength against tension in the surface direction is not sufficient. obtain. Further, the step in the surface direction is cut by heat rays so that the level difference in the joint surface portion is 0.5 mm or less, and the cutting operation in the surface direction is essential.

  The present invention has been made in view of the above circumstances, and at least one of the surfaces is a flat surface with no step by simply bonding and bonding the foamed resin molded products taken out of the foaming mold as they are. An object of the present invention is to provide a foamed resin joined body in which the joint portion can also have sufficient joint strength. It is another object of the present invention to provide a core material for a vehicle bed using the same.

  The foamed resin joined body according to the present invention is a foamed resin joined body in which two or more plate-like foamed resin molded bodies are joined to each other via a joining region, and There is a gap in the thickness direction that can absorb shape changes such as irregularities occurring on the joint surface, and the gap is filled with an adhesive, and at least one surface of the foamed resin joined body The step at the joint between the foamed resin moldings is 3% or less of the thickness of the joining region.

  In a preferred embodiment of the foamed resin joined body according to the present invention, the gap is 3% to 5% of the thickness of the joining region. The step is 1 mm or less. The adhesive is a hot melt resin.

  The present invention also discloses a core material for a vehicle bed constituted by the foamed resin joined body.

  The foamed resin joined body according to the present invention is a foamed resin joined body in which two or more plate-like foamed resin molded bodies are joined to each other via a joining region, and the presence of the gap makes it possible to join the joint. Does not form a step that gives the user a feeling of discomfort. Therefore, the foamed resin joined body according to the present invention is extremely effective for use as a core material for a vehicle bed used in a large truck or the like.

The side view which shows one Embodiment of the foamed resin joined body by this invention. The side view which shows other embodiment of the foaming resin conjugate | zygote by this invention. The 1st figure which shows the manufacturing process of a foamed resin joined body. The 2nd figure which shows the manufacturing process of a foamed resin joined body. The 3rd figure which shows the manufacturing process of a foamed resin joined body. The 4th figure which shows the manufacturing process of a foamed resin joined body. The figure for demonstrating the implemented adhesive strength test. The 1st figure for demonstrating the inconvenience in the conventional foaming resin conjugate | zygote. The 2nd figure for demonstrating the inconvenience in the conventional foaming resin conjugate | zygote.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Reason why foamed resin joined body according to the present invention is required]
First, the contents of the study performed by the present inventor in order to solve the problem to be solved by the above-described device will be described. The inventor conducted a number of experiments in which a foamed resin molded body was foam-molded using a foam molding die, and the two foamed resin molded bodies were adhesively bonded to form a foamed resin bonded body. In one experiment, in order to obtain a high bonding strength, an adhesive is not provided between the bonding surfaces that are spread in the surface direction, rather than by the abutting surfaces between the side end surfaces of the two foamed resin molded bodies. Application and adhesive bonding were performed.

  In the process, even if the foamed resin molding is foam-molded using a foam molding die made as designed, if the foamed resin molding becomes large, foaming during foam molding based on the molding material It is extremely difficult to eliminate any variation in the thickness of the foamed resin molded product, and the foamed resin molded product after demolding may undergo slight deformation during cooling, etc. I learned that it is not possible to completely avoid this. Due to the variation in thickness, it was found that when two foamed resin moldings were bonded and joined via a joint that spreads in the plane direction, a step that cannot be ignored (for example, exceeding 1 mm) occurred at the joint. .

  For example, consider a foamed resin joined body 100a in which two foamed resin molded bodies 10 and 20 having the shape shown in FIG. Here, both the first foamed resin molded body 10 and the second foamed resin molded body 20 are plate-like bodies, and their thicknesses are equal and both are d. The first foamed resin molded body 10 and the second foamed resin molded body 20 are in-lay joined in the joining region.

  That is, the first foamed resin molded body 10 has a first surface 11 that is the lower surface in the figure and a second surface 12 that is the upper surface, and the second foamed resin molded body 20 is the lower surface in the figure. It has the 1st surface 21 and the 2nd surface 22 which is an upper surface. One side surface side of the first foamed resin molded body 10 is a joint portion 13 having a width a, and the distal end side (right end side in the drawing) of the joint portion 13 is a distance in the thickness direction from the first surface 11. A front horizontal plane 14 is located at a position s1 (<d), and a rear horizontal plane 15 is located at a distance s2 (<s1) in the thickness direction from the first face 11 at the back (left side in the figure). 11 is formed in parallel.

  A portion of the second foamed resin molded body 20 facing the joint portion 13 of the first foamed resin molded body 10 is also a joint portion 23 having a width a, and the tip side of the joint portion 23 (the left end in the figure). The front horizontal plane 25 is located at a position d-s2 below the second surface 22 in the thickness direction from the second surface 22 and the distance d-s1 from the second surface 22 in the thickness direction at the back (right side in the figure). A rear horizontal surface 24 is formed at a lower position in parallel to the second surface 22.

  The first foamed resin molded body 10 is arranged on the support base 30 so that the first surface 11 faces the flat surface 31 of the support base 30. An adhesive such as hot melt resin is applied to the front horizontal surface 14 and the rear horizontal surface 15 of the first foamed resin molded body 10. After the application, the second foamed resin molded body 20 is placed so that its front horizontal surface 25 faces the rear horizontal surface 15 of the first foamed resin molded body 10, and thereafter the horizontal plane 24 is the first foamed resin molded body 10. It arrange | positions on the 1st foamed resin molding 10 so that the front horizontal surface 14 may be faced. Then, a weight W is placed on the joint portion 23 of the second foamed resin molded body 20, and the portion of the joint portion 23 of the second foamed resin molded body 20 is replaced with the first foamed resin molded body 10. It presses toward the junction part 13 of this. Thereby, the applied adhesive spreads in the surface direction, and the first foamed resin molded body 10 and the second foamed resin molded body 20 spread in the surface direction in the joining region due to the curing of the adhesive. A joint portion is formed, and both are bonded and joined together.

  In this case, when the joint portion 13 of the first foamed resin molded body 10 and the joint portion 23 of the second foamed resin molded body 20 have shapes as shown in the design drawing, as shown in FIG. A step is not formed at the joint between the two, and the first surface 11 of the first foamed resin molded body 10 and the first surface 21 of the second foamed resin molded body 20 are flat surfaces 31 of the support base 30. It becomes a flush surface along.

  However, in an actual foamed resin molded product, for the reasons described above, it is difficult to avoid the case where it does not match the design drawing like a mechanical part. It is almost impossible to avoid it with a large one and a large one in the surface direction. One example will be described with reference to FIG.

  In the example shown in FIG. 9, an increase in thickness occurs in all or part of the front horizontal surface 14 of the first foamed resin molded body 10, and the distance s11 from the first surface 11 to the front horizontal surface 14 is s1 + α (<d ) Is assumed to have occurred. In this case, even if the area of the joint portion 23 of the second foamed resin molded body 20 is pressed downward by the weight W, the descending distance of the second foamed resin molded body 20 is the same as that of the front horizontal plane 14. The second foamed resin molded body 20 is lower than the first foamed resin molded body 20 by a distance α as compared with the one shown in FIG. 8, which is regulated by the distance s11 (s1 + α) from the first surface 11. It is inevitable that the surface 21 is in a posture of floating from the flat surface 31 of the support base 30.

  On the design value, the first surface 11 which is the lower surface of the first foamed resin molded body 10 and the first surface 21 which is the lower surface of the second foamed resin molded body 20 are surfaces to be flush with each other. However, as described above, when the second foamed resin molded body 20 is floated, a step k having a distance α is formed at the joint portion between the two. The occurrence of the step k on the surface that should be essentially the same surface as the core material of the vehicle bed causes discomfort to the user. According to the experience of the present inventors, in an actual product, the allowable distance k of the step k is 1 mm or less and the step k is 3% or less of the product thickness. Desired.

[Description of the foamed resin joined body according to the present invention]
FIG. 1 is a side view showing an embodiment of a foamed resin joined body according to the present invention, and FIG. 2 is a side view showing another embodiment.

  The foamed resin joined body 100 shown in FIG. 1 does not have the above-described step k in the manufacturing process, and the distance α is 3% or less of the thickness at the joined portion. An example of 100 is shown. The foamed resin joined body 100 is a foamed resin joined body in which plate-like foamed resin molded bodies are joined together via a joining region. In FIG. 1, the first foamed resin joined body 10 and the second foamed resin joined body 100 are the same. The foamed resin molded body 20 is integrally bonded via the bonding region 40. Except for the shape of the joining region 40, other configurations are the same as those of the conventionally known first foamed resin molded body 10 and second foamed resin molded body 20 described with reference to FIG. Therefore, in FIG. 1, parts corresponding to the same members are denoted by the same reference numerals as in FIG.

  The foamed resin joined body 100 is substantially flush with the first face 41, which is substantially flush with the first face 41, but there may be a step at the joint in the joining region 40. And a second surface 42. The first surface 41 and the second surface 42 are preferably parallel surfaces, but may not be parallel surfaces. In the foamed resin joined body 100 shown in FIG. 1, the first surface 41 and the second surface 42 are parallel to each other and are substantially flush with each other. In the present invention, the substantially flush surface is a surface desired to be flush, in the illustrated example, the first surface 41, and the level difference k occurring at the joint in the joining region 40. States that is 1 mm or less.

  Both the first foamed resin molded body 10 and the second foamed resin molded body 20 have a thickness d. The first foamed resin molded body 10 has a first surface 11 that is a lower surface and a second surface 12 that is an upper surface in the figure, and both are parallel to each other. The 2nd foaming resin molding 20 has the 1st surface 21 which is a lower surface in the figure, and the 2nd surface 22 which is an upper surface, and both are mutually parallel surfaces.

  One end face side of the first foamed resin molded body 10 is a joint 13 having a width a. In the joint portion 13, the second surface 12 side that is the upper surface is cut away in the thickness direction. As a result, in the joint portion 13, the thickness from the first surface 11 that is the lower surface is t1 (<d). ing.

  A portion of the second foamed resin molded body 20 facing the joint portion 13 of the first foamed resin molded body 10 is also a joint portion 23 having a width a. In the joint portion 23, the first surface 21 side which is the lower surface is cut away in the thickness direction by the thickness of t1 + α. In this example, since the thickness of both the first foamed resin molded body 10 and the second foamed resin molded body 20 is d, the thickness t2 at the joint portion 23 in the second foamed resin molded body 20 is t2 = d-t1-α.

  Accordingly, the first foamed resin molded body 10 is temporarily placed on a support base having a flat surface so that the first surface 11 faces the temporary foamed resin foam 10 thus temporarily placed. The second foamed resin molded body 20 is disposed in such a posture that the first surface 21 faces the support base so that the joint portion 23 of the second foamed resin molded body 20 is positioned on the joint portion 13. 1, the distance between the joint portion 13 of the first foamed resin molded body 10 and the joint portion 23 of the second foamed resin molded body 20 in the joint region 40 as shown in FIG. A gap P of α exists. The gap P is filled with an adhesive, and the bonding portion 13 of the first foamed resin molded body 10 and the joint portion 23 of the second foamed resin molded body 20 are surface-oriented by the adhesive. Thus, the foamed resin joined body 100 is obtained by being adhesively bonded to each other.

  In the foamed resin bonded body 100, the gap P having the distance α is positively formed in the bonding region 40, so that a shape change such as unevenness generated on the bonding surface in the bonding region 40 is caused in the gap P. It is possible to absorb, and thereby, there is no step at the joint between the first surface 11 of the first foamed resin molded body 10 and the first surface 21 of the second foamed resin molded body 20. A foamed resin joined body 100 having a surface is obtained. Even when there is a level difference, the level difference is slight and is 3% or less of the thickness d of the bonding region 40. Moreover, the said clearance gap P can absorb shape changes, such as an unevenness | corrugation which have arisen in the joining surface of the junction part 13 of the 1st foamed resin molding 10, and the junction part 23 of the 2nd foamed resin molding 20. The gap in the thickness direction can be formed. Preferably, the distance α of the gap P is 3% to 5% of the thickness of the bonding region 40.

  Next, the procedure when the first foamed resin molded body 10 and the second foamed resin molded body 20 are integrally bonded and bonded using an adhesive to form the foamed resin bonded body 100 is shown in FIGS. Explanation will be made with reference to FIG.

  First, as shown in FIG. 3, the first foamed resin molded body 10 is placed on the support surface 31 in the support base 30 having the flat support surface 31, and the first surface 11 is the flat surface 31. Arrange them so that they are on the side. Next, as shown in FIG. 4, an adhesive (preferably an adhesive that is a hot-melt resin) 50 is applied to the upper surface portion of the joint portion 13 in the arranged first foamed resin molded body 10. Apply linearly at a height exceeding the distance α.

  After the adhesive 50 is applied, as shown in FIG. 5, the second foamed resin molded body 20 is joined to the first foamed resin molded body 10 to which the lower surface side of the joint portion 23 is coated with the adhesive 50. It is disposed on the flat surface 31 of the support base 30 in a posture that faces the upper surface of the portion 13. After the placement, a weight W is placed in the region corresponding to the joint portion 23 on the second surface 22 side, preferably the second surface 22 side, of the second foamed resin molded body 20, and the second foamed resin molding is performed. The body 20 is pressed downward. Accordingly, the second foamed resin molded body 20 is pushed downward, that is, toward the flat surface 31 side of the support base 30.

  The state after pressing down is shown in FIG. As described above with reference to FIG. 1, the thickness from the first surface 11 at the joint 13 having the width a in the first foamed resin molded body 10 is t1 (<d), and the second In the foamed resin molded body 20, the thickness t <b> 2 from the second surface 22 at the joint portion 23 having the width a facing the joint portion 13 of the first foamed resin molded body 10 is d−t1−α. ing. Therefore, t1 + t2 = d−α, and the second foamed resin molded body 20 is pushed down toward the flat surface 31 side of the support base 30, and the lower surface of the joint portion 23 and the joint portion 13 are formed in the joint region 40. A gap P having a distance α remains between the upper surface of the first and second surfaces. In addition, the adhesive 50 is applied at a height equal to or greater than the distance α, and by pressing down the second foamed resin molded body 20, the adhesive 50 is flatly spread and the lower surface of the joint portion 23 and the joint portion 13. Adhesive bonding to the upper surface of

  In this state, the first surface 11 of the first foamed resin molded body 10 and the first surface 22 of the second foamed resin molded body 20 are both of the flat support surface 31 of the support base 30. In the foamed resin joined body 100, the end surfaces of the first surface 11 of the first foamed resin molded body 10 and the first surface 21 of the second foamed resin molded body 20 are positioned between each other. The joint portion, which is an abutting surface, is in a state without a step. Even when there is a step, the distance α of the gap P can be suppressed to 3% or less of the thickness of the bonding region 40 by setting the distance α to 3% to 5% of the thickness of the bonding region 40.

  Note that the distance α of the gap P is set to a distance of 3% to 5% of the thickness of the joining region 40. In the foamed resin molded body, the foam-molded one according to the mold is removed in the thickness direction after demolding. This is based on the knowledge obtained by the present inventor that the degree of dimensional change is about 3% to 5% based on empirical rules.

The above manufacturing method is divided into processes and summarized as follows. That is,
Manufacturing a foamed resin joined body in which a plate-like first foamed resin molded body and a second foamed resin molded body are integrally joined together by a joining region, and at least one surface is substantially flush. A way to
Forming a first joint surface at a height position of a distance t1 from the one surface to be flush with the surface corresponding to the joint region of the first foamed resin molded body;
The first foamed resin molded body of the first foamed resin molded body is positioned at a height of a distance t1 + α from the one surface to be flush with the portion corresponding to the joining region of the second foamed resin molded body. Forming a second bonding surface facing the bonding surface;
Placing the first surface of the first foamed resin molded body on the flat surface of the support base having a flat surface so that the one surface side to be the flat surface is the flat surface side;
A step of applying an adhesive at a height exceeding the distance α on the first joint surface in the arranged first foamed resin molded body;
The second joint surface of the second foamed resin molded body is positioned so as to face the first joint surface of the first foamed resin molded body to which the adhesive is applied. Placing the foamed resin molded body on the flat surface of the support; and
Applying a pressing force to at least a portion corresponding to the joining region of a surface opposite to the one surface to be the flush surface of the second foamed resin molded body;
And a method for producing a foamed resin joined body in which at least one surface is flush with the other.

  In the above method, it is a practically preferable aspect that the distance α is 3 to 5% of the thickness of the joint and that the adhesive is a hot melt resin.

  In the above description, the shapes of the joint portion 13 in the first foamed resin molded body 10 and the joint portion 23 in the second foamed resin molded body 20 in the joint region 40 are both just a single flat plate shape. However, the shape of the joint 13 and the joint 23 is not limited to this. The shapes of both are arbitrary, provided that a gap P having a distance α is formed between the upper surface of the joint portion 13 and the lower surface of the joint portion 23 in a state of facing each other. As long as the surfaces are parallel to each other, the joint portion 13 and the joint portion 23 may be inclined surfaces.

  For example, as shown in FIG. 2 and as described above based on FIG. 8, the front horizontal surface 14 on the front end side (the right end side in the drawing) and its front portion A rear horizontal plane 15 is formed in the back (left side in the figure), and the distal end side (left end in the figure) is formed on the joint portion 23 of the second foamed resin molded body 20 facing the joint portion 13 of the first foamed resin molded body 10. The front horizontal plane 25 on the side) and the rear horizontal plane 24 formed in the back (right side in the figure) may be used. However, even in that case, the gaps P in the respective thickness directions are formed so that gaps P of the distance α are formed both between the front horizontal plane 14 and the rear horizontal plane 24 and between the rear horizontal plane 15 and the front horizontal plane 25. It is necessary to set the height.

  In the present invention, the first foamed resin molded body 10 and the second foamed resin molded body 20 are in-mold foam molded bodies of foamed resin. Although it does not restrict | limit especially as a foamed resin, Usually, the foamed thermoplastic resin is used. For example, a foamed polystyrene resin, a foamed composite resin containing a polystyrene resin and a polyolefin resin, a foamed polyolefin resin, or the like is preferably used. The expansion ratio can be appropriately adjusted according to the type of foamed resin, but is about 10 to 50 times, typically about 20 to 40 times when the application is a core material for a vehicle bed.

  Hereinafter, the superiority of the product of the present invention will be described with reference to examples and comparative examples. The vehicle bed core material was aimed at as a product. The bed core material for a vehicle is usually about 2000 mm in length, 500 mm in width, and 38 mm in thickness, and it is impractical to form a foamed resin molded product of this size as a unit. Therefore, the plate-like foamed resin molded body divided into two in the length direction was subjected to in-mold foam molding and bonded and joined to obtain a foamed resin joined body of the above size.

  As the foamed resin, a foamed composite resin (Piocelan (registered trademark): TOPF-40DUB, manufactured by Sekisui Plastics Co., Ltd.) of polystyrene resin and polyolefin resin was used, and the expansion ratio was 40 times. Piocelan has a shrinkage ratio of about 8.5 / 1000.

  The first foamed resin molded body 10 and the second foamed resin molded body 20 whose cross sections are the shapes shown in FIGS. 1 and 2 were subjected to in-mold foam molding. The thickness d was both 38 mm. By adjusting the thicknesses of the joint portion 13 and the joint portion 23 in both of the foamed resin molded bodies, three types of materials having distances α of the gap P of 1.2 mm, 1.5 mm, and 1.8 mm were prepared.

  Example products 1 to 3 of Examples 1 to 3 were manufactured by using the three types and following the procedures described in FIGS. A hot melt resin having a viscosity of 4.4 Pa · S and a shear strength of 2.7 MPa was used as the adhesive. For the product after adhesive bonding, the step k (mm) generated at the joint between the first foamed resin molded body 10 and the second foamed resin molded body 20 was measured. Further, an experiment was conducted to determine whether or not adhesion failure occurs by the method shown in FIG. The results are shown in Table 2.

  In the adhesion fracture experiment, as shown in FIG. 7, one end of the first foamed resin molded body 10 in the foamed resin joined body 100 was placed on a pedestal, and the top was gripped and fixed. The distance between A, which is the joint on the upper surface side, and the fixture was 3 × B, and the load position was 3 × B from the joint A. Here, B is the product thickness (here, d). Judgment of adhesion failure was determined to be a pass (○) when the product was a displacement Y × B (d) at the load position, and there was no peeling (including adhesion failure) at the adhesive joint by the adhesive. . However, Y is a coefficient contributing to the expansion ratio, and the correlation between the expansion ratio and the coefficient is shown in Table 1 below. Here, since the expansion ratio is 40 times, Y = 2.

  The determination is that the step ratio (k / d) is 3% or less of the thickness d of the joint, and the joint has a gap P with a distance α (gap ratio) of 3% to 5% of the thickness d of the joint. When it exists, it was set as a pass (◯). Note that this determination result is also obtained when the first foamed resin molded body 10 and the second foamed resin molded body 20 having the shape shown in FIG. 1 are used. The same was true when the molded body 10 and the second foamed resin molded body 20 were used.

Comparative example

  Using the same resin material and the same adhesive, comparative products 1 to 4 having the form shown in FIG. 2 and the dimensions shown in Table 3 were prepared, and the same determination as in the example was performed.

[Evaluation]
In the comparative example products 1 and 2, the steps are 1.8 mm and 1.5 mm, exceeding the maximum allowable value of 1 mm based on experience, and cannot be said to be satisfactory products. This is because the gap ratio (α / d) is as small as 0% and 2%, and it becomes impossible to absorb the dimensional change generated in the first foamed resin molded body 10 and the second foamed resin molded body 20 after foam molding. It is. Further, the comparative products 3 and 4 could not satisfy the breaking strength. This seems to be caused by the gap ratio increasing to 6%. From this result, the condition that the level difference at the joint is 3% or less of the thickness of the joint and that a gap in the thickness direction of 3% to 5% of the thickness of the joint is formed in the joint. The comparative product that does not satisfy the criteria was rejected (x) in the determination.

100: Foamed resin joined body,
10 ... 1st foaming resin molding,
11 ... 1st surface which is the lower surface of the 1st foaming resin molding,
12 ... the second surface which is the upper surface of the first foamed resin molded body,
13 ... Joint part of the first foamed resin molding,
20 ... 2nd foaming resin molding,
21 ... The first surface which is the lower surface of the second foamed resin molded body,
22 ... the second surface which is the upper surface of the second foamed resin molded body,
23 ... Joint part of the second foamed resin molding,
30 ... support stand,
31 ... Flat support surface,
40 ... joining region,
41... A first surface that is substantially flush with the foamed resin joined body;
42 ... the second surface of the foamed resin joined body,
50 ... Adhesive (preferably hot melt resin),
d: the thickness of the first foamed resin molded body and the second foamed resin molded body (thickness of the joint),
t1 ... the thickness of the joint portion of the first foamed resin molding,
t2: thickness of the joint portion of the second foamed resin molded body (t2 = d−t1-α),
P: a gap between the joint portion of the first foamed resin molded body and the joint portion of the second foamed resin molded body,
α: Distance of gap P,
k ... steps.

Claims (5)

A foamed resin joined body in which two or more plate-like foamed resin molded bodies are joined together via a joining region,
There is a gap in the thickness direction capable of absorbing shape changes such as irregularities generated on the joining surface in the joining region between the foamed resin molded bodies, and the gap is filled with an adhesive. The step at the joint between the foamed resin molded bodies on at least one surface of the foamed resin joined body is 3% or less of the thickness of the joining region.   The foamed resin joined body according to claim 1, wherein the gap is 3% to 5% of the thickness of the joining region.   The foamed resin joined body according to claim 1 or 2, wherein the step is 1 mm or less.   The foamed resin joined body according to any one of claims 1 to 3, wherein the adhesive is a hot melt resin.   The core material of the bed for vehicles comprised by the foamed resin joined body as described in any one of Claims 1-4.

Images