JPS59197436A - Plate-form high-density polyethylene foam - Google Patents

Abstract

PURPOSE:The titled plate-form foam excellent in packing applicability to a wooden frame structure and suitable for use as an insulation material for framehouses, prepared by expansion-molding high-density polyethylene into a foam having a specified apparent density, a specified average cell diameter and a specified shape. CONSTITUTION:A plate-form high-density polyethylene foam prepared by expanding high-density polyethylene of a density of 0.935-0.966g/cm<3> and melt index of 0.01-5.5g/10min so that the produced foam may have an apparent density of 0.007-0.1g/cm<3> and an average cell diameter of 0.05-3mm., wherein the end area is at least about 37.5cm<2>, the minimum sectional size is at least 1cm, and the ratio of the maximum sectional size to the minimum sectional size is at least 3.75. It is also possible to obtain a wider foam plate by uniting a plurality of the above plate-form foams 1 together by hot melting (symbol 2 is a part bonded by hot melting) at their end faces.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate-like foam of high density polyethylene.

Conventionally, low-density polyethylene, cross-linked low-density polyethylene, cross-linked polypropylene, etc. have been known as polyethylene foams, and plate-shaped foams have been known as low-density polyethylene and some cross-linked polyethylene foams. These plate-shaped foams were mainly used as cushioning materials by cutting, cutting, adhesive processing, etc., but in recent years, they have been used as insulation materials, especially as insulation materials.
It has been attracting attention as a filling insulation layer for the timber frame structure of wooden houses.

However, these conventionally known polyethylene foams have a poor balance between rigidity and compressive strength, and even when attempting to fill them into a wood-framed structure, the foam may rise in the center of the wood-framed structure, or gaps may occur due to insufficient fitting compression ratio. In some cases, the foam may sag, lack self-supporting properties, and easily fall off, or it may be necessary to fix the foam with nails or adhesives, and in some cases, the ends of the foam may be processed into a specific shape by post-processing to balance the compressive strength. It is necessary to change the fitting compression ratio at the trimmed end to make it easier to install, and it has not yet been put into practical use.

The present invention relates to a plate-shaped foam made of high-density polyethylene that has significantly improved the drawbacks of these prior art techniques.

That is, the first aspect of the present invention is that the density is 0.9359/, L3
Made of high-density polyethylene with a melt index of 0.9669/crri'' or less and a melt index of 0.01!; Multiplication is density 0OO79/c
A plate-like foam having an IrL3 to 0.102A1, wherein the end cross-sectional area of the plate-like foam is at least about 375 CIr.
L2, a plate-shaped foam of high-density polyethylene characterized by a small minimum cross-sectional dimension at the end (ICrIL), the ratio of the maximum cross-sectional dimension to the surface dimension is 375 or more. A second aspect of the present invention is a plate-shaped foam formed by fusion-bonding a plurality of plate-shaped foams according to the first invention at their end faces.

The plate-shaped foam of the present invention has rigidity, compressive strength, or fitability suitable for filling a wooden structure, and exhibits foam characteristics suitable as a heat insulating material for a wooden house.

The plate-shaped foam of the present invention is a highly foamed body made of high-density polyethylene, and the high-density polyethylene has a density of 0.935.
g/cm3 or more and 0.966'J/cm3 or less, and the melt index must be within the range of 0.01 g/10 minutes or more and 5 g/10 minutes or less.

A foam made of polyethylene having a density of less than 0.9359/cm3 has no rigidity and has poor construction performance as a heat insulating shell for a wooden house, which is the object of the present invention, and is therefore undesirable. Also, 0.
Those thicker than 966'i/crn3 and those with a melt index smaller than 0.019/10 min.degree. C. are undesirable because they have too high rigidity and high compressive strength, making them unsuitable for filling work.

High-density polyethylene foam larger than 5.5'7/10 minutes has a low closed cell ratio (when used as a heat insulating material, moisture flowing in from the high temperature side causes condensation inside the heat insulating material, significantly reducing the heat insulating performance. It is preferable to lower the temperature by ℃.

The plate-shaped foam of the present invention has a density of 0935/'crrL3
Those with a melt index of 0.9.669/Crn3 or less and a melt index of 001σ/10 minutes or more and j'7/10 minutes or less have excellent workability as well as heat resistance, heat insulation, dimensional stability, etc. More preferable.

The cross-sectional shape of the plate-like foam of the present invention has a cross-sectional area at the end of at least about 37.5 cm2, a minimum cross-sectional dimension at the end of at least ICrrL, and a ratio of the maximum cross-sectional dimension to the minimum end cross-sectional dimension. must be 375 or more. This relationship applies to the case of a plate-shaped foam whose end cross-section is a rectangular cross-section. The cross-sectional shape of is shown.

In Figure 1, if the minimum cross-sectional dimension on the left side of straight line (2), that is, the end of the butt end, is smaller than IC7n, the foam cannot be fitted into the timber frame when it is used as a filling insulator in a timber structure, and the center of the foam This may cause cracks or bulges in the parts, reducing workability. Below curve (1), when making a heat insulating material that is suitable for the spacing between the timber frames of a general wooden house, it is not only not economical to make it by gluing and combining many foam pieces, but also below curve (1). The foam at the lower limit of side and straightness 3) has a poor balance between rigidity and compressive strength, and its compression strength becomes extremely high, making filling work impossible.

The reason for this is that when the foam is formed, the stretching orientation effect that acts on the cell membrane changes depending on the direction of the minimum cross-sectional dimension and the maximum cross-sectional dimension within the cross section of the product, and as a result, the bending rigidity, compressive strength, This is thought to be due to the influence of compression modulus, compression set, etc.

In addition, the maximum cross-sectional dimension of the plate-shaped foam of the present invention is approximately 120 cm, taking into account the spacing between the timbers of a wooden house.
/n or less, minimum cross-sectional dimension is 10CTL or less, cross-sectional area is 6
00cIrL2 or less is useful.

The plate-shaped foam of the present invention has a small cross-sectional area at the end and a door width of 67.5 mm.
Cm2, the minimum cross-sectional dimension of the butt end is small (both 3CTL), and the ratio of the maximum cross-sectional dimension of the end of the end to the minimum cross-sectional dimension of the end of 375 or more is preferable because it has excellent insulation performance and workability.

The plate-shaped foam of the present invention has an apparent density of 0.1. Ori/cII
L3 or below 0. It is a highly foamed material with an OO of 7g/cm3 or more. If the apparent density is greater than 0.10 tom3, the rigidity will be too thick, making filling construction impossible, and the insulation performance will also deteriorate, which is not preferable. Also, if the apparent density is less than 0.001, the compressive strength will be too low, the compression set will be large, and the dimensional stability will be poor, so it is not preferable. The apparent density is 0.0609
/cm3 or less and 0.0109/am3 or more is more preferable.

The plate-shaped foam of the present invention has a cell structure with an average size of 0.0
The thickness is 5 to 3.0 mm, and 02 to 2.0 mm is preferable from the standpoint of heat insulation and filling workability.

The foam of the present invention can be produced by a conventionally known foaming method, but the extrusion foaming method is preferred since it is excellent in continuous production of long products and production of various cross-sectional shapes.

Specifically, a cooling device is connected to the tip of an extruder equipped with a resin supply port and a foaming agent injection port, followed by a foam molding device equipped with a gas slit having an opening shape that matches the cross-sectional shape of the product. The resin and foaming agent are heated under pressure in an extruder,
The mixture is mixed uniformly, cooled to a temperature suitable for foam molding using a cooling device, and extruded into the atmosphere through a grease slit to produce a plate-shaped foam.

The blowing agent used (preferably a volatile organic compound, such as aliphatic hydrocarbons, chlorinated hydrocarbons, fluorinated chlorinated hydrocarbons, etc.), logenated hydrocarbons, alcohols, ethers, esters, etc. There are mixtures of these, such as butane, methyl chloride, methylene chloride, dichlorodifluoromethane, dichlorofluoromethane, chlorodifluoromethane, dichlorotetrafluoroethane, 'tri(lolotrifluoroethane, etc.), and mixtures thereof. The one selected from is used.

More preferably, a mixed blowing agent of dichlorotetrafluoroethane and one selected from other halogenated hydrocarbons and aliphatic hydrocarbons, or a mixed blowing agent of dichlorotetrafluoroethane and one selected from other halogenated hydrocarbons and fat. Mixed blowing agent with one selected from group hydrocarbons, containing 20 to 80 mol% of dichlorotetrafluoroethane.
It contains.

When manufacturing the plate-shaped foam of the present invention, the foaming behavior is improved to produce a plate-shaped foam of excellent quality with a thickness of 3 m or more with little thickness unevenness and a cross-sectional area of the end of 67.5 Crn2 or more. A modifier effective for this purpose may also be used.

゛ This modifier has the following general formula (1), (I
I), the compound represented by the side shows particularly excellent effects and is preferred at °C.

As a modifier, the general formula % formula % () (in the formula, R is an alkylene group having 1 to 5 carbon atoms, ACY7 is a hydrogen atom or an acyl group, n is an integer of 1 to 10, and X is 0 or 1 to 2 (is an integer of
, n, * have the same meanings as above),
and at least 1'gi selected from polyoxyethylene-polyoxypropylene broth polymers represented by the general formula (in the formula, a, t) and C are integers of 1 or more). .

Among these compounds represented by general formulas (I), (II) and symbols, preferred is the compound (1), and a particularly preferred foaming modifier is a mixture of (1) and (■). .

The mixing ratio of (I) and (n) in this mixture is suitably in the range of 1:4 to 4:1, preferably 3:3 to 7:3.

The amount of their compound used is in the range of 0.05 to 15 parts by weight, preferably in the range of 0.1 to 10 parts by weight, per 100 parts by weight of polymer.

Specific examples of the compound represented by the general formula (1) include 2-hydroxyethylamine, di-2-hydroxyprolamine, tri-2-hydroxyethylamine, 2-hydroxypropylamine, di-2-hydroxypropylamine, tri-2-hydroxypropylamine, 2-hydroxypropylamine, di-2-hydroxypropylamine, tri-2-hydroxypropylamine, tri-polyoxyethylamine, and ester compounds of these with fatty acids, such as tri-2-hydroxyethylamine monostearate , tri-2-hydroxyethylamine distearate, tri-2-hydroxyethylamine distearate IJ stear L/-1・,)! J-2
-Hydroxylamine monolaurate, )! J-2
-Hydroxyethylamine dilaurate L'-1-, tri-2-hydroxyethylamine trilaurate, etc., and particularly preferred are 2-hydroxyethylamine, tri-2-hydroxyethylamine, tri-2-hydroxypropylamine, and 2-hydroxyethylamine. , G2
-Hydroxypropylamine, tri-2-hydroxypropylamine. These compounds may be used alone or in combination of two or more. Examples of the compound represented by the above general formula (11) include N
-2-Hydroxyethyl-hexanamide, N-2-hydroxyethyl-octanamide, N-2-hydroxyethyl-decanamide, N-2-hydroxyethyl-dodecanamide, N-2-hydroxyethyl-tetradecanamide, N -2-hydroxyethyl-hexadecanamide 1,N-2-hydroxyethyl-oftatecanamide, N,N-di-2-hydroxyethyl-hexanamide, N,N-di-2-hydroxyethyl-octanamide, N,N -di-2-hydroxyethyl-decanamide, N,N-di-2-hydroxyethyl-dodecanamide, N,N-2-hydroxyethyl-tetradecanamide, N,N-di-2-hydroxyethyl-hexadecanamide, N,N -di-2-hydroxyethyl-octadecaneamide, N-2-hydroxypropyl-hexanamide, N-2-hydroxypropylhexanamide, N
-2-hydroxyglopyru-decanamide, N-2-hydroxyglopyru-decanamide, N-2-hydroxyglopyru-tetradecanamide, N-2-hydroxypropyl-hexadecanamide, N-2-hydroxypropyl-off Tatecanamide, N, N-di-2-hydroxypropyl-hexanamide, N + N-di-2-
Hydroxypropylhexanamide, N,N-”
-2-Hydroxypropyl-decanamide, N,N-di-2-hydroxypropyldodecanamide, /N,N-2-hydroxybutybutyratecanamide, N,N-di-2-hydroxypropylhexadecanamide, N, N-cy 2-hydroxypropyl-octadecanamide, polyoxyethylene octanamide, polyoxyethylene octanamide, polyoxyethylene tecanamide, polyoxyethylene dodecanamide, polyoxyethylene tetradecane amide, polyoxyethylene hexadecane amide, poly Examples include oxyethylene ophtatecanamide, and particularly preferred are N-(or N,N-c)2-hydroxyethyl-hexanamide, N-(or N,N-di)2-hydroxyethyl-
Octaneamide, N-(:liN, N-di)2-hydroxyethyl-dodecanamide and N-(or N,N-
G) 2-hydroxypropylhexanamide, N-(
or N,N-di)2-hydroxypropyl-octanamide, N-(or N,N-di)2-hydroxypropyl-dodecaneamide.

These compounds may be used alone or in combination of two or more.

Further, the compound polyoxyethylene-polyoxychloropylene blot 2 polymer represented in the above-mentioned general book 2 can be obtained, for example, by addition polymerizing ethylene oxide to both ends of polypropylene glycol obtained by polymerizing propylene oxide.

Among these polyoxyethylene-polyoxypropylene block polymers, preferable ones are those in which a is in the range of 17 to 34, b is in the range of 7 to 90, and C is in the range of 7 to 90 in the general formula [phase]. These compounds may be used alone or in combination of two or more.

The plate-shaped foam of the present invention is useful as a filling insulation material for wooden houses. This filled insulation material can be in any form as long as it has dimensions that are approximately 10% larger than the dimensions of the wooden structure of a wooden house, for example, the distance between pillars or pillars and studs, and the distance between the foundation and the frame. For example, a foam plate with the above dimensions, a foam plate with longitudinal notches to improve workability, or a whole number of foam pieces with the largest end cross-sectional dimension obtained by dividing the above dimensions into integers. The end surfaces may be bonded so that they are in contact with each other, or they may be laminated and bonded with a film or the like.

In addition, depending on the site of use, it may contain flame retardants, colorants, antioxidants, ultraviolet absorbers, antistatic agents, antifogging agents, anti-condensation agents, etc. As long as 80% by weight or more of the high-density polyethylene is defined by the present invention, other resins, rubbers, etc. may be added thereto.

Next (and the cross-sectional area of the butt end is at least about 37.5 Cl12
, the minimum end cross-sectional dimension is at least IC1ll11, and the ratio of the maximum end cross-sectional dimension to the minimum end cross-sectional dimension is 3.
A foam obtained by fusion-bonding a plurality of plate-shaped foams having a size of 75 or more at their end faces will be described.

Note that hereinafter, the foam before fusion bonding will be referred to as a foam board unit, and the large-area plate-shaped foam formed by fusion bonding will be referred to as a fusion bonded foam board.

To join foam units, for example, bring a hot plate, hot iron, etc. into contact with the end faces of the foam unit to melt the resin on the end faces, and then cool the end faces together until the molten resin solidifies. A method of joining is used.

The joint may be made by joining the entire end face of the foam board unit 1 with the fusion joint 2 at ℃ as shown in Fig. 2, or by gluing a part of it as shown in Fig. 3. It is also possible to leave it as the non-fused portion 3 without doing so.

As shown in FIG. 2, in the case where the entire end face of the foam board unit 1 is fusion-bonded, the presence of the fusion-bonded portion 2 increases the compressive strength.

Furthermore, in the case of the fused foam board 4 provided with the non-fused portion 3 as shown in FIG. 3, the non-fused portion 3 functions as a cut, and the fused joint portion 2 functions as a hinge portion. As a result, the plate surface can be bent or bent at the non-fused portion 3, and the work of press-fitting between columns etc. becomes easy. Furthermore, the dimensions of the fused foam board 40 can be varied by peeling off the foam board unit 1 at the non-fused portion 3, which is convenient for on-site construction.

In addition, since the fused foam board 4 is made by fusion bonding the foam board units 1 that have compression elasticity, the board as a whole has compression elasticity, so it is difficult to press fit between columns etc. can be easily done.

Furthermore, since the fused foam 4 is made of polyethylenes fused and bonded together, the adhesive strength at the bonded portion is high.

゛Considering that although polystyrene foam can be fused, the fused joint becomes hard, and if the plate-shaped foam is bent when press-fitting between columns etc., it becomes irregularly shaped and easily breaks. ,
Note: It is clear that the great strength of the joints of the fused foam of the present invention is a great advantage.

In addition, in order to manufacture a fused foam board 4 having a non-fused portion 3 as shown in FIG. 3, the foam board unit 1 is prepared as shown in FIG.
It is preferable to provide a convex portion 5 on the end face, as shown in FIG. The convex portions 5 may be provided on one side of the board surface as shown in Fig. 4 a, c, and d, or may be provided on both sides of the board surface, or may be provided on one side. There is no problem even if the ones provided on both sides are used in combination. Further, the shape of the convex portion 5 may be rectangular in cross section as shown in FIGS. 4a and 4b,
It may have a round cross section as shown in Fig. 4C (or it may be formed by having a tapered end face as shown in Fig. 4D). In this case, the non-fused portion 3 after fusion bonding becomes a V-shaped groove.

Note that it is free to separately bend the fused foam board and make cuts for bending (different from the grooves formed by the non-fused portions).

Next, an example in which a waterproof/moisture-proof film or sheet 6 is attached to one side of a plate-shaped foam to improve moisture permeability is shown in FIGS. 5 and 6 a and b. In Fig. 5, a waterproof/moisture-proof film or sheet 6 with a width wider than the width of the foam plate is pasted on one side of a plate-shaped foam made of high-density polyethylene, and the projecting edges of the film or sheet 6 are attached to both ends. The foam plate 1 is provided with a section 7 and a cut 8 that does not reach the back surface of the foam plate through the film or sheet.
The film or sheet 6 is press-fitted between support frames 9 provided at intervals smaller than the width dimension of 0, and the support frames 9 are covered with the overhanging edges 7 of the film or sheet 6. In addition, when providing the overhanging edge part 7, the film or sheet 6 is provided on the entire surface of the board.
There is no need to stick it on, and it is sufficient to just cover the contact portion between the support frame 9 and the plate-shaped foam 10. FIG. 7 shows an example in which a waterproof/moisture-proof film or sheet 6 is adhered to the end of the plate-shaped foam 10 by fusion. 11 is a fused portion.

After the item shown in Fig. 6 is fitted, the notch 8 may be closed, and the moisture permeation from the notch 8 can be minimized (prevented). Water permeability can be suppressed by a waterproof/moisture-proof film or sheet 6.

If the ends of the foam plate 10 and the film or sheet 6 are left unattached, the surface of the foam plate 10 to which the film is attached will be closer to the front surface of the support frame 9, as shown in FIG. Even when the film or sheet 6 is pushed in such a way that it is located on the inside, the film or sheet 6 does not become taut and tear, or wrinkles occur due to partial tension, which is preferable.

In FIGS. 5 to 7, the plate-shaped foam according to the first invention whose end faces are not fused is explained as an example, but the plate-shaped foam obtained by fusion-bonding the end faces according to the second invention is explained. It is useful to attach the above-mentioned waterproof/moisture-proof film or sheet to the body (fused foam board), and it goes without saying that it may be processed separately to make cuts.

Note that it is not necessary to fix the waterproof/moisture-proof film or sheet 6 to the support frame 9. If it is fixed, temporarily fix it with adhesive, nails, etc., and then attach the facing material from above. This may be done by stacking them and driving them into the support frame 9 with decorative nails from above the facing material.

The waterproof/moisture-proof film or sheet 6 to be attached to the plate-shaped foam 10 is preferably thin, strong, and thick. Preferably, such a film is a polyethylene film, and films made of high pressure, medium or low pressure polyethylene may be used.

The film thickness is preferably in the range of 15 to 20011, and 7
The range of 0 to 120μ is more preferable. If it is too thick, there may be problems with economic efficiency or the facing material (interior material) may lift up, while if it is too thin, the barrier properties may deteriorate and moisture permeability may not be improved much, or it may tear easily. be. If the thickness is selected within the above numerical range, the above problem will not occur, and it will not get in the way when installing a thin surface material, and will not cause unevenness of the surface material when applied to a floor surface. Please note that this may cause the wood to squeak.

Examples of waterproof/moisture-proof sheets include paper impregnated with wax, paper laminated with resin, and tar paper.

As will be described in detail in Examples below, parts are parts by weight.

Test methods and evaluation methods in Examples are as described below.

Resin Density Cut out the resin that makes up the cells of the foam into small pieces J, IS
It was measured by the density gradient tube method described in K 6760.

The resin that makes up the cells of the Nord Index resin foam is cut into small pieces and JIS
It was measured by the method described in K 6760. The measurement conditions were 1.9Q±05°C, load 2160±IOg-.

Workability of the insulation material (plate-shaped foam) The width and length of the test piece are approximately 10% larger than the internal dimensions of the timber frame of a wooden house. (consisting of the foundation, sills, and studs) was filled and evaluated using the following criteria.

The resins used in the examples are shown below.

A O,9600,3sa7'Ttsuk B870E
O,9665// J24ICO,9537
uJ340 DO,9695,Ott J240E
O,928' 0.45 11 Q9
50.1 Diameter 1 with resin supply port and foaming agent injection port
A cooling device is placed at the tip of the 50 mm extruder, and then the interval is: 1. ,
100 parts of resin A, 05 parts of talc, polyoxyethylene-polyoxypropylene block polymer ('a = 17, b = 7, C nia )
A blowing agent mixed with 157 parts of dichlorotetrafluoroethane and 157 parts of trichlorotrifluoroethane was supplied, mixed uniformly at 199°C under pressure, and heated to 126°C with a cooling device. The mixed resin cooled to C was extruded into the atmosphere and foamed into a plate shape.

The resulting foam has a thickness of 3CTL and a maximum weight of 25CrfL.
A plate-shaped foam with a flat elliptical cross section and an apparent density of 0.02
0g//cm3, closed cell ratio 98%, average cell diameter 1.5
It was 1 nm.

Example 1 A 2 m long plate-shaped foam having a flat elliptical cross section with a thickness of 3 crrL and a maximum weight of 25 cm was extruded using resin A according to the method described in the production example, and both ends were cut to form a 2 m long sheet of foam with a thickness of 3 crrL and a maximum weight of 25 cm.
A plate-shaped foam having a rectangular cross section with a width of 22.5 m was manufactured. Two of the obtained plate-shaped foams were arranged so that one end surface was in contact with each other, and one side of the plate-shaped foam was heat-laminated with a low-density polyethylene film having a thickness of 100 μm to obtain a filled heat insulating material. Next, the insulation material was filled into the timber structure of a wooden house, and the workability of the insulation material was evaluated. This product was easy to fill, had excellent self-supporting properties during filling, did not bend, and did not protrude from the center surface. In addition, there was no gap between it and the wooden structure (excellent fit was exhibited).

Example 2 A plate-like foam having a rectangular cross section with a thickness of 3 crn and a width of 22.5 cm was manufactured using Resin B in the same manner as described in the Manufacturing Examples. Example 1 using this foam
A heat insulating material was made using the same method as above, and its fillability was evaluated. The results are shown in Table 1, Notification 2.

Comparative Example 1 A heat insulating material was made using a plate-shaped waste foam produced in the same manner as in Example 1 except that the resins were changed to E, C, and D.
The construction method was evaluated. (However, in the case of Resin E, dichlorotetrafluoroethane was used as the blowing agent.) The results are shown in Table 1, Experiment A 3.4.5.

As is clear from Table 1, the density is 0.9359/cm”
If the resin is smaller than 09662A1, the insulation will have poor self-sustainability and workability, and if it is thicker than 09662A1, the compressive strength will be large and filling will be difficult. ” - It is clear that it is undesirable because it cannot be detached from the timber-framed structure and has poor fitability.

Example 3 In Example 1, the shape of the extrusion foaming mold was variously changed to produce a plate-shaped foam with a rectangular cross-section having the minimum cross-sectional dimensions (thickness) and maximum cross-sectional dimensions (width) shown in Table 2. was manufactured.

Filled type insulation boards were made using these foams and their construction methods were evaluated. The results are shown in Table 2. The width of each foam was divided into integer parts of 45 crIL so that the width of the heat insulating board was 45 crIL, and was partially adhered at the end surface.

Note that the end faces were bonded together by heating only about half of the thickness of the heat insulating board with a hot iron and crimping it. The workability evaluation results are shown in Table 2, and the bending elastic modulus in the width direction is higher than that of a foam board that is simply cut without being fused (it is easier to fill in a wooden structure, It has the advantage of being able to be installed in a short time because there is no deviation at the joint surface and the filling is uniform.

From Table 2, the minimum cross-sectional dimension and maximum cross-sectional dimension of plate-shaped foam/
The minimum cross-sectional dimension ratio and cross-sectional area are 1"α and 375.3, respectively.
It is clear that if it is smaller than 7.5 cm2, the filling workability will be poor and it is not preferable.

\

[Brief explanation of the drawing]

Figure 1 is a graph showing the influence of cross-sectional dimensions of the butt end on workability when high-density polyethylene plate-shaped foam is filled into a silk-like structure. Schematic cross-sectional view of a reservoir showing an example of a plate-shaped foam, FIGS. 4a-d
is a schematic cross-sectional view illustrating the shape of the end face of a foam board unit used when fusion bonding is performed while leaving a non-fused portion;
Figure 5 (Cross-sectional view showing an example where a waterproof/moisture-proof film or sheet is attached between the board-shaped foam bodies, Figure 6 a + b
7 is an explanatory diagram showing the construction process, and FIG. 7 is a sectional view showing an example in which a film or sheet is attached to the end of a plate-shaped foam. 1. Foam board unit, 2. Fusion bonding Part, 3...
Non-fused portion, 4... Fused foam board, 5... Convex portion, 6... Waterproof/moisture proof film still sheet, 7...
. . . old edge, 8. notch, 9. support frame, 10. plate-shaped foam, 11. fused portion. Minimum surface dimensions of the plate-like material>Husband (Rhin #) (C7rL) Demon 2 Figure 3' ■

Claims (2)

[Claims] (1) Density 0.935 g/crn” or more 0.96
69/cm3 or less and melt index 0.01/
It is made of high-density polyethylene and has an average cell diameter of 0.05 to 3.52/10 minutes. O
rnm, the apparent density is 0. OO79/cm" to 010", the foam plate has a cross-sectional area at the end of at least about 37.5 cm2, and a minimum cross-sectional dimension of the end is at least 1-1 relative to the minimum cross-sectional dimension of the end; A plate-shaped foam made of high-density polyethylene, characterized in that the ratio of the maximum end dimension is 375 or more. (2) Density 0.9359/cm" or more 0.9669/c
m3 or less and melt intex O, O]g/l is within the range of 0 minutes to 55 g/10 minutes, average cell diameter is 005 to 3.0 inches, and apparent density is 0. OO79/crn3~0.109/cm3
with a cross-sectional area of at least about 37.5 c/rL2
, the minimum end cross-sectional dimension is at least 1c7IL, and the ratio of the maximum end cross-sectional dimension to the minimum end cross-sectional dimension is 3.
A plurality of plate-like foams with a temperature of 75 or higher are placed on their end surfaces at °C.
A plate-shaped foam made of high-density polyethylene, characterized in that it is formed by fusion bonding.