WO2005039863A1

WO2005039863A1 - Process for producing olefinic resin foam

Info

Publication number: WO2005039863A1
Application number: PCT/JP2004/015681
Authority: WO
Inventors: Hiroshi Nosaka; Takeshi Yukawa
Original assignee: Asahi Kasei Life & Living Corporation
Priority date: 2003-10-23
Filing date: 2004-10-22
Publication date: 2005-05-06
Also published as: JPWO2005039863A1

Abstract

A process for producing an olefinic resin foam, in which a drop of compressive elasticity modulus of foam by needle perforation conducted after foaming can be suppressed while maintaining the capability of speedy replacement of flammable foaming gas by an inorganic gas such as air and in which satisfactory thickness recovery can be ensured. There is provided a process for producing an olefinic resin extruded foam, comprising the step of perforating with needles an olefinic resin extruded foam produced with the use of a flammable gas as a foaming agent in the thickness direction from the surface thereof, wherein a needle assembly consisting of an assembly in frog-like form of needles each having 3 to 8 edge lines defined below on its trunk part is used as the needles: 1) edge lines composed of protruding-angle edges extending in the longitudinal direction of the needle trunk part, and 2) edge apexes on a cross section perpendicular to the longitudinal direction of the needle trunk part having an internal angle of 20° to 120°.

Description

Specification

Method for producing olefin resin foam

Technical field

The present invention relates to a method for producing an oil-based resin foam capable of easily replacing a blowing agent gas remaining in a foam with air. The foam produced by the production method of the present invention is used as a cushioning packaging material for industrial products and the like, a heat insulation beat board for houses and the like, a sporting tool core material for body boats and the like, a floating material such as a float and the like.

Background art

[0002] A foaming agent is used in producing a plastic foam. In recent years, from the viewpoint of destruction of the ozone layer and global warming, the foaming agent is changed from a CFC-based foaming agent to a hydrocarbon (C3-C5) -based foaming agent. Is being converted into a drug. It is known that hydrocarbon-based blowing agents are flammable. When such flammable blowing agents are used, they remain in the foam for a long time due to their low gas permeability. This increases the likelihood that the foam will ignite and burn if a fire source is nearby. As a method of solving this problem, a method of storing the foam at a high temperature for a long period of time and lowering the concentration of the blowing agent inside the plastic foam to a safe concentration is generally used, but it is still several months or even longer. It is not very efficient because it requires the above storage period.

[0003] As a method of shortening the time required for replacing the combustible foaming agent remaining in the foam with a nonflammable inorganic gas such as air, a method of perforating the foam after manufacture with a needle from the surface thereof ( There is a patent document 1), and a sword-shaped needle assembly is used as a needle for perforation. However, in the method of Patent Document 1, when a needle having a circular cross section is used, perforation is performed so as to push open the pierced hole. As a result, the frictional resistance between the needle surface and the foam surface increases, and the perimeter of the hole is dragged in the perforating direction during perforation, thereby increasing the compressive strain, making it impossible to obtain a sufficient volume recovery and compressing the foam. There is a problem that the elastic modulus is also lowered.

Patent Document 1: Patent No. 3431141

Disclosure of the invention Problems the invention is trying to solve

[0004] The present invention reduces the compression modulus of the foam due to perforation of the needle after foaming while maintaining the performance of replacing the combustible foaming gas with an inorganic gas such as air in a short period of time by performing perforation. An object of the present invention is to provide a method for producing an oil-based resin foam which can be suppressed and can sufficiently recover the thickness.

Means for solving the problem

The present inventors have found that the above problem can be solved by using a needle having a polygonal needle cross section when piercing in the thickness direction from the surface of the foam, and have accomplished the present invention. . That is, the present invention is as follows.

1. A method for producing an extruded resin-based resin foam, which comprises a step of perforating a resin-based resin-extruded foam produced using a combustible gas as a foaming agent with a needle in the direction of its thickness.

A method for producing an oil-refined extruded foam using a needle assembly in which needles having three or more and eight or less ridge lines defined below in a needle stem are gathered in a sword mountain shape as the needles:

1) The ridge line is a ridge that has a length in the length direction of the needle stem.

2) The interior angle of the apex of the ridge at the section perpendicular to the length direction of the needle stem is not less than 20 ° and not more than 120 °.

2. The process for producing an extruded resin-based resin foam according to claim 1, wherein the length of the ridge line of the needle is 1Z2 or more of the thickness of the extruded resin-based resin foam.

3. The olefin system according to claim 1 or 2, wherein the diameter of the smallest circle capable of surrounding all the vertices in the cross section perpendicular to the length direction of the needle stem is 0.8 mm or more and 5 mm or less.方法 Manufacturing method of extruded fat.

4. The method for producing an extruded olefin-based resin foam according to claim 1, wherein the depth force of perforation in the olefin-based resin foam is “the thickness of the foam is 5 mm” or more.

5. The method for producing an extruded resin-based resin foam according to claim 1, wherein the interval between perforations on the surface of the resin-based resin foam is 5 mm or more and 20 mm or less.

6. The method according to claim 1, wherein the foam has a thickness of 20 to 80 mm. 7. The method for producing an extruded resin-based resin foam according to claim 1, wherein the needle assembly has needle rows in the width direction and the length direction, and one row of the needle rows in the width direction also has a needle force of 8 or more. .

8. The olefin resin extruded foam according to claim 1, wherein the needle assembly has a row of needles in a width direction and a length direction, and each row of the lengthwise needle rows has a needle force of 30 or more. Production method.

The invention's effect

[0006] The method for producing an oil-based resin foam of the present invention has good volume recoverability by suppressing the distortion generated at the time of perforation even if the foam is perforated after foaming, and the foam is compressed. A method for producing a resin foam, which can obtain a good foam without lowering the elastic modulus and can replace the flammable foam gas remaining in the foam with an inorganic gas such as air in a short period of time. It is.

BEST MODE FOR CARRYING OUT THE INVENTION

[0007] The present invention will be specifically described below, particularly focusing on its preferred embodiments.

First, the foam used in the present invention will be described.

Examples of the olefin resin constituting the foam used in the production method of the present invention include polyethylene homopolymers such as high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene, polypropylene homopolymers, and the like. Examples thereof include polybutene homopolymer, ethylene-butyl acetate copolymer, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-butene-propylene copolymer, and ethylene-acrylic acid copolymer. These resins can be used alone or in combination as appropriate.

[0008] The combustible foaming gas in the present invention includes aliphatic hydrocarbons such as propane, n-butane, i-butane, n-pentane, i-pentane and hexane; and cycloaliphatic hydrocarbons such as cyclobutane and cyclopentane. And halogenated hydrocarbons such as 1-chloro-1,1-difluoroethane and chloroethane. Furthermore, a non-combustible foaming gas such as carbon dioxide, nitrogen, 1,1,1,2-tetrafluoroethane may be mixed with these combustible foaming gases. The density of the foam obtained can be arbitrarily controlled by adjusting the amount of the foaming agent.

[0009] In the production of the foam, a permeation modifier may be used!ヽ. Examples of permeation modifiers And known gas permeation modifiers, for example, fatty acid glycerides such as palmitic acid glyceride and stearic acid glyceride, fatty acid amides such as oleic acid amide and erlic acid amide, and alkyl fatty acid amides such as stearyl stearic acid amide. These gas permeation modifiers can be used alone or in combination as appropriate.

[0010] Further, in the production method of the present invention, a generally used bubble nucleating agent may be used as necessary. Examples of the cell nucleating agent include an inorganic substance such as talc, a chemical foaming agent that decomposes at the temperature of the extruder to generate a decomposition gas, or an acid that reacts at that temperature to generate carbon dioxide gas. And a mixture of alkalis. The cell size of the foam obtained by using these cell nucleating agents can be controlled arbitrarily.

Further, if necessary, additives such as an antistatic agent, an antioxidant, an ultraviolet absorber, and a coloring agent can be added to the mixed resin.

[0011] The thickness of the foam of the present invention is preferably from 20 mm to 80 mm. Within this range, the effect of the perforation method of the present invention is remarkably obtained. If the foam is thicker than this, the contact area between the needle and the foam increases and the piercing resistance increases, so that the foam is compressed and damaged. However, by using the needle according to the method of the present invention, puncture resistance is reduced, and damage to the foam can be suppressed. The configuration of the foam may be a single layer or a lamination by heat fusion or the like.

The density of the foam of the present invention is preferably 10-100 kgZm ³ , more preferably 20-70 kgZm ³ . When the density is 10- lOOkgZm ^3, insulation, floating materials, it can be used as cushioning packaging material applications.

The closed cell ratio of the foam obtained by the present invention is preferably 80 to 100%, more preferably 90 to 100%, except for the portion of the pores formed by perforation. When the closed cell ratio is 80% or more, sufficient cushioning performance can be exhibited as a cushioning wrapping material, and the water absorption rate can be reduced because water hardly penetrates into the foam.

Further, the cell size of the foam of the present invention is preferably from 0.3 mm to 3. Omm, more preferably from 0.5 mm to 2.5 mm. In thermal insulation applications, the smaller the cell size is, the more the radiation from the bubble film is suppressed, and the thermal insulation performance is improved even if it comes in contact with water. Water infiltration is suppressed, and a decrease in heat insulation performance can be prevented.

[0012] In the method for producing a foam of the present invention, an extruder melt-kneads additives such as a resin, a foaming agent, a gas permeation modifier, and, if necessary, a cell nucleating agent, under pressure, and then performs an appropriate This involves extruding the foamable molten mixture, cooled to the foaming temperature, through a die attached to the extruder tip under atmospheric pressure to foam.

The perforation of the present invention may be performed after the temperature of the central part of the foam obtained as described above falls below the crystallization temperature of the added gas permeation modifier. By perforating at a temperature below the crystallization temperature of the gas permeation modifier to which the temperature at the center of the foam is added, the gas barrier effect of the gas permeation modifier exerts a gas barrier effect, thereby preventing rapid escape of the foaming agent. Thus, good volume recovery of the foam is possible.

[0013] As the needle used for the perforation of the present invention, a needle having three to eight ridge lines at the needle stem is used. Here, the ridge line also refers to a ridge that is an exit angle extending in parallel with the needle length direction, and the inner angle of the ridge apex in a cross section perpendicular to the length direction of the needle trunk, that is, the body of the needle, is 20 ° or more. 120 ° or less. If the number of the ridge lines is less than 2, the force which deteriorates the durability of the needle or the resistance of the needle at the time of piercing increases. When the number of ridges is nine or more, the cross section perpendicular to the length direction of the needle has a shape close to a circle, so that when piercing, the periphery of the hole pierced by the needle is pushed out. The number of the ridge lines is preferably four or more and six or less, and most preferably four. If the angle of the apex is less than 20 °, the thickness of the ridge portion becomes thin, and the needle has poor durability. If the angle exceeds 120 °, the cross-section becomes almost circular, so that the same drawbacks as in the case of perforating with a circular cross-section needle occur, and the compressive strain of the foam increases after perforation. The ridge may be a curved surface. In this case, the angle formed by the tangent at the vertex is the angle of the vertex. Typical cross-sectional shapes of these needles are shown in Fig. 1 (a)-(e).

[0014] Perforation of the foam of the present invention is performed using a sword-shaped needle assembly having a large number of needles. A sword-shaped needle assembly is one in which the needles are arranged so that multiple perforations in the foam can be made at one time. For a needle assembly, a row of needles parallel to the width direction of the foam should have at least 8 needle forces, and a row of needles parallel to the extrusion direction of the foam should have at least 30 needle forces. Is preferred. In addition, a row of needles parallel to the width direction of the foam also has at least 10 or more needle forces, and Z or the direction of extrusion of the foam. It is more preferable that each row of needles has a needle force of at least 60 needles, since the blur of the needle assembly in the pierced state is reduced. More preferably, a row of needles parallel to the extrusion direction of the foam has at least 90 or more needle forces. The arrangement of the needles is, for example, a staggered grid or a square grid. By using a sword-shaped needle assembly, a large number of perforations can be made in the foam at one time, and the gas escapes from the foam uniformly. Deformation is easily suppressed. In addition, since the perforation processing ability is increased, the perforation speed can be relatively reduced, and a foam having a good surface appearance without fluffing of the foam surface at the time of needle withdrawal can be obtained. Furthermore, when the thickness of the foam is large, using a needle assembly in which needles are arranged vertically and horizontally, compared to a case where needles are provided on the roll surface, in addition to keeping the needle insertion angle constant and piercing the needles In this state, the needle assembly does not shake, and the shape of the hole formed is stable. Force!] In addition, since the perforation resistance is reduced, a strain suppressing effect can be obtained.

The length of the ridgeline of the needle is preferably not less than 1Z2 of the thickness of the foam to be pierced and not more than the length excluding the tip of the needle. The length of the ridge is the length of the point where the ridge first occurs at the tip of the needle. If the length of the ridgeline of the needle is 1Z2 or more of the thickness of the foam, the effect of suppressing distortion at the time of perforation becomes sufficient. The effect of the present invention can be more sufficiently obtained if the ridge extends over all portions except the tip of the needle. The ridge line may have a length equal to or greater than the thickness of the foam.

In the present invention, the thickness of the needle refers to the diameter of the smallest circle capable of surrounding all the vertices in a cross section perpendicular to the length direction of the needle trunk, that is, the body of the needle. In the present invention, a needle having a thickness of 0.8 mm or more and 5 mm or less is used. When the thickness of the needle is 0.8 mm or more, replacement of the combustible gas remaining in the foam with an inorganic gas such as air is performed promptly. When the thickness of the needle is 5 mm or less, the surface appearance of the foam after perforation becomes good, and at the same time, when it comes into contact with water, it is easy to suppress the intrusion of water into the hole. Preferably, it is not less than 1. Omm and not more than 4. Omm, more preferably not less than 1.5 mm and not more than 3. Omm.

All of the needles have a sharpened tip, and the pointed portion may have a circular cross section or the same shape as the stem. Titanium coating on needle surface Also, a surface treatment such as Teflon (registered trademark) coating may be performed.

The depth of the perforations in the thickness direction of the foam in the method of the present invention is preferably “the thickness of the foam is 5 mm” or more, that is, it completely penetrates or has a non-penetration allowance of 5 mm or less. When the depth of the perforations is “the thickness of the foam is 5 mm or more”, the residual combustible gas in the foam is promptly replaced with an inorganic gas such as air, and the gas from both surfaces of the foam is removed. Since the diffusion of gas proceeds uniformly, the distribution of residual stress in the foam due to gas dissipation is reduced, and deformation during foam processing can be suppressed. When the depth of the perforations is less than the thickness of the foam, that is, when the foam is non-penetrating, only the perforated surface is subjected to a heat treatment such as heating and melting, so that the non-penetrating surface has a good surface appearance and water absorption, Low permeability and foam.

[0017] The interval between the perforations on the foam surface of the present invention refers to the shortest distance between the centers of adjacent holes, preferably 5 mm or more, 20 mm or less, more preferably 10 mm or more, 15 mm or less. When the distance between the perforations is 5 mm or more, rapid escape of combustible foamed gas is easily suppressed, and the volume recovery of the foam is improved. If the interval between the perforations is 20 mm or less, the replacement of the residual flammable foaming agent in the foam with an inorganic gas such as air is performed quickly. When the interval between the perforations is 10 mm or more and 15 mm or less, the balance between the volume recovery property of the foam and the gas replacement promoting effect is excellent.

[0018] In order to promote the replacement of the residual flammable gas with an inorganic gas such as air, the foam after the perforation treatment has a temperature of 30 ° C or more and 50 ° C or less after the perforation treatment for 7 days or more. It is preferable to store for 30 days or less. If the temperature is 30 ° C or more, the replacement of the residual flammable gas with an inorganic gas such as air is promptly performed. When the temperature is 50 ° C or lower, the residual flammable gas can be prevented from being excessively released, so that the foam can be prevented from shrinking.

Example

Hereinafter, the ability to explain the present invention based on examples is not intended to limit the contents of the present invention to these examples. The values shown in the examples were measured by the following methods. In the examples, parts and% are by weight unless otherwise specified. Various evaluations and measurements were made according to the following methods.

(1) 5% compressive strength

After storing the perforated foam at 40 ° C for 2 weeks, it conforms to JIS Z0235. , A compression test value of 5% with respect to the original thickness of the test piece and a compressive strength S of 5%, and a test in which a foam made of the same LOT is not perforated The specimen was compared with the compressive stress value S under the same conditions and evaluated according to the following criteria.

0

E (%) = (S -S) / S X 100

o o

〇: E≤ 10 (Decrease in compression modulus due to perforation is small! / ,.)

X: E> 10 (Decrease in compression modulus due to perforation is large.)

(2) Thickness recovery

After extrusion foaming, the resin foam is cut to a length of 1000 mm, and the dimension obtained by accurately measuring the thickness of the foam is T. Thereafter, the resin foam is perforated to remove the resin foam.

0

After 1 hour to 2 weeks after foaming, store at 40 ° C and then measure the thickness again. The thickness recovery rate (R) was calculated by the following equation, and based on the value, the thickness recovery was evaluated according to the following criteria.

R (%) = T / T X 100

0

〇: R≥95 (Excellent thickness recovery, easy to maintain thickness during manufacturing)

X: R <95 (Thickness recovery is poor and it is difficult to maintain thickness during manufacturing)

(3) Gas replacement promoting effect

Two weeks after the perforation process, the resin foam stored at 40 ° C in an environment shall be drawn out into a columnar shape in the thickness direction using a cork boiler with an inner diameter of 16 mm to make a test piece. Immediately after measuring the volume and weight of this test piece, immediately place it in a headspace bottle (manufactured by GL Sciences) whose internal volume has been measured, seal it, and heat and melt at 170 ° C for 1.5 hours. Thereafter, the bottle was naturally cooled to room temperature, and the gas in the bottle was separated and analyzed by gas chromatography (GC-14B, manufactured by Shimadzu Corporation). Using the calibration curve prepared in advance from the known gas concentration measurement, the volume of the test piece, the resin part volume of the test piece, and the volume in the bottle, average the residual foaming agent concentration in the foam as n = 3. Was calculated. The concentration of the residual blowing agent in the foam and the effect of promoting the replacement with the inorganic gas were evaluated according to the following criteria.

〇: The residual flammable blowing agent concentration is less than the lower limit of the combustion range of the blowing agent

X: The residual flammable blowing agent concentration is equal to or higher than the lower limit of the flammable range of the flammable blowing agent.

(4) Closed cell rate of foam It was measured by the air pycnometer method described in ASTM-D2856 (manufactured by Tokyo Science Co., Ltd., using an air-comparison-type specific gravity system type 1000), and was calculated as an average of n = 5.

(5) Cell size of foam

The test piece was also cut at the center of the foam, and L (mm) straight lines were drawn on the cut surface along the extrusion, width, and thickness directions of the foam, and the number of air bubbles in contact with these straight lines was determined. The cell size in the extrusion direction, width direction, and thickness direction was calculated by the following formula, and the average value in three directions was used as the cell size (grid line method).

Cell size (mm) = 1.626 X LZ bubble count

[Example 1]

Low-density polyethylene (density 0.921gZcm3, MI = 2.9gZlO) and 1.0 parts by weight air bubble adjustment per 100 parts by weight of this resin in the supply area of a screw type extruder with a barrel inner diameter of 150mm (Talc) and 0.5 parts by weight of a gas permeation modifier (stearic acid monoglyceride) were supplied at a rate of 900 kgZ hours. The barrel temperature of the extruder was adjusted to 190 ° C-210 ° C, and the foaming agent injection rocker attached to the extruder tip also foamed with 100% by weight of n-butane (lower limit of combustion range: 1.8 vol%) 7 parts by weight of the agent was injected into 100 parts by weight of this resin, and mixed with the molten resin composition to obtain a foamable molten mixture. After cooling the foamable molten mixture to 108 ° C with a cooling device attached to the outlet of the extruder, the temperature is increased from the orifice plate having an average thickness of about 3.4 mm and an opening shape of about 215 mm width to room temperature and large temperature. It is extruded and foamed continuously in an atmosphere under atmospheric pressure, molded while adjusting the take-off speed of the resin foam, and after 1 minute of extrusion foaming, thickness 62 mm, width 600 mm, length 1000 mm, cell size 1.lmm Thus, a plate-like resin foam having a density of 39 kgZm ³ was obtained.

Immediately after the temperature of the center of the foam has dropped to 50 ° C, the needle 1 shown in Table 1 (the cross-sectional shape is (Fig. 1 (b)) is pushed in the extrusion direction of the foam as shown in Fig. 2. Needle spacing a in needle rows parallel to c is 15.Omm, needle spacing b in needle rows parallel to the foam width direction d is 15.Omm. : 15. Omm), and perforated from the upper surface of the resin foam.After storing the resin foam in a 40 ° C environment for 2 weeks after the perforation, the compression elasticity The evaluation of 5% compressive strength, closed cell ratio, thickness recovery, and gas replacement promoting effect, which are indicators of the ratio, is shown in Table 2. [Example 2]

As shown in Fig. 2, the needle 2 in Table 1 (the cross-sectional shape of the stem is shown in Fig. 1 (b)) and the needle interval a in the needle row in the direction parallel to the extrusion direction c of the foam is 15.Omm as shown in Fig. 2. Therefore, the depth of the piercing is determined using a needle-shaped needle assembly (perforation interval: 15. Omm) arranged so that the needle spacing b in the row of needles parallel to the width direction d of the foam is 15. Omm. A foam was obtained in the same manner as in Example 1, except that a perforation treatment was performed so as to be 59 mm. The same evaluation as in Example 1 was performed on the obtained foam. Table 2 shows the results.

[Example 3]

Needle 3 in Table 1 (the cross-sectional shape of the stem is Fig. 1 (a)) is shown in Fig. 2.As shown in Fig. 2, the needle spacing a in the needle row parallel to the foam extrusion direction c is 10. The puncturing process was performed except that the needle spacing b in the needle row parallel to the width direction d was 20. Omm. A foam was obtained in the same manner as in Example 1. The same evaluation as in Example 1 was performed on the obtained foam. Table 2 shows the results.

[Example 4]

Needle 4 in Table 1 (the cross-sectional shape of the trunk is (Fig. 1 (d))), as shown in Fig. 3, the needle spacing a in the needle row parallel to the extrusion direction c of the foam is 10. Omm, Perforation processing using a sword-shaped needle assembly (perforation interval: 10. Omm) arranged in a staggered grid so that the needle spacing b in the needle row parallel to the width direction d of the foam is 20. Omm A foam was obtained in the same manner as in Example 1 except that the evaluation was carried out, and the obtained foam was evaluated in the same manner as in Example 1. The results are shown in Table 2.

[Comparative Example 1]

A foam was obtained in the same manner as in Example 1 except that the piercing treatment was performed with the needle 5 shown in Table 1, and the same evaluation as in Example 1 was performed. Table 2 shows the results.

[Comparative Example 2]

A foam was obtained in the same manner as in Example 2 except that the piercing treatment was performed with the needle 6 shown in Table 1, and the same evaluation as in Example 1 was performed. Table 2 shows the results.

[Comparative Example 3]

A foam was prepared in the same manner as in Example 2 except that the perforation was performed with the needle 7 shown in Table 1. And the same evaluation as in Example 1 was performed. Table 2 shows the results.

[Comparative Example 4]

A foam was obtained in the same manner as in Example 1 except that the perforation treatment was not performed, and the same evaluation as in Example 1 was performed. Table 2 shows the results.

[table 1]

Industrial applicability

The foam according to the present invention, which can be easily replaced with air by a blowing agent gas remaining in the foam, is manufactured by a method for manufacturing an olefin resin foam, which is used for cushioning packaging materials for industrial products, housings, and the like. Insulation material Core material for sports equipment such as beat boards and body boats, It is used as a floating material for boards and the like. Brief Description of Drawings

FIG. 1 is a view showing an example of a cross-sectional shape of a representative needle stem in the present invention, wherein (a) shows a cross-sectional shape of a needle stem used in Example 3, and (b) shows Examples 1 and 2. The cross-sectional shape of the stem of the needle used in Example 2, (d) shows an example of the cross-sectional shape of the needle used in Example 4, and (c) and (e) show examples of other cross-sectional shapes.

FIG. 2 is a needle arrangement diagram of a sword-like needle assembly in which needles are arranged in a square lattice used in an example of the present invention.

FIG. 3 is a needle arrangement diagram of a sword-shaped needle assembly tool in which needles are arranged in a houndstooth check pattern used in an example of the present invention.

Explanation of symbols

A: Needle spacing in a needle row in a direction parallel to the extrusion direction of the foam

b: Needle spacing in a needle row parallel to the foam width direction

c: Foam extrusion direction

d: Foam width direction

Claims

The scope of the claims

[1] A method for producing an extruded resin-based resin foam, which includes a step of perforating a resin-based resin-extruded foam produced using a combustible gas as a foaming agent with a needle in the surface direction in a thickness direction,

1) The ridge line is a ridge that has an exit angle that extends parallel to the length of the needle stem.

[2] The process for producing an extruded resin-based resin foam according to claim 1, wherein the length of the ridgeline of the needle is 1Z2 or more of the thickness of the extruded resin-based resin extruded foam.

[3] The Orefin according to claim 1 or 2, wherein in a cross section perpendicular to the length direction of the needle stem, the diameter of the smallest circle capable of surrounding all the vertices is 0.8 mm or more and 5 mm or less. A method for producing a resin-based extruded foam.

[4] The process for producing an extruded olefin-based resin foam according to claim 1, wherein the depth of perforations in the olefin-based resin-extruded foam is not less than “the thickness of the foam is 5 mm”.

[5] The method for producing an extruded olefin resin foam according to claim 1, wherein the interval between perforations is 5 mm or more and 20 mm or less on the surface of the extruded olefin resin foam.

[6] The method for producing an olefin resin extruded foam according to claim 1, wherein the foam has a thickness of 20 to 80 mm.

[7] The production of the resin-based expanded foam according to claim 1, wherein the needle assembly has a row of needles in the width direction and the length direction, and one row of the row of needles in the width direction also has a needle force of 8 or more. Method.

[8] The olefin-based resin-extruded foam according to claim 1, wherein the needle assembly has needle rows in the width direction and the length direction, and one row of the needle rows in the length direction has a needle force of 30 needles or more. Manufacturing method.