JPH1158568A - Porous laminated packaging material and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a porous laminated interior finish material having excellent antidewing property and heat insulation and porous laminated packaging material of a low cost by manufacturing it with high production accuracy in the compact step of manufacturing by simultaneously extrusion laminating at the time of forming vent holes. SOLUTION: A porous laminated interior finish material 10A is a sheet formed of an air permeable sheet 1 and an extrusion resin layer 3 having vent holes each having a size of 0.1 to 3 mm and 0.25 to 8 pieces/cm<2> with through or non-through vent holes. Further, an air permeable sheet 1 containing at least 50 wt.% or more of olefin melt fiber is laminated. The porous laminated packaging material comprises a sheathing material adhered to a sheathing connecting surface side of the material 10A via an extrusion adhesive layer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perforated laminated packaging material which contains heated food, prevents dew condensation on the surface of the food due to water vapor generated from the food, and is excellent in heat retention and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, when cooking, reheating, and the like of food are carried out in a microwave oven, it has been practiced to absorb water vapor generated from the food and wrap it in a perforated laminate packaging material having heat insulation and heat it. I have. Such a laminate packaging material, for example, laminating a synthetic resin film on paper,
A water- and oil-impermeable sheet is formed, the impervious sheet is subjected to perforation for water vapor permeation, and a permeable sheet is laminated on the inner side by thermocompression bonding.

[0003]

However, in such a conventional perforated laminate packaging material, the holes for water vapor transmission are formed in a separate step from the laminating process by a perforation method using a needle roll or by a laser beam irradiation. It was perforated by the perforation method. In addition, thermocompression bonding of the inner breathable sheet has been performed by post-processing of the perforation processing. For this reason, there has been a problem that the manufacturing process of the perforated laminate packaging material is complicated and production efficiency is reduced. The present invention has been made in view of the above problems, and provides a perforated laminate packaging material that can easily obtain desired dew condensation prevention properties and heat retention properties, has a small number of production steps, and has high production efficiency, and a method for producing the same. It is intended for.

[0004]

As a result of various studies on the above problems, the present inventors have found that (i) a breathable sheet (A), if necessary, an inner breathable sheet (D), and a breathable sheet (A). By forming a perforated laminated interior material having an extruded resin layer (B) laminated on one side (between one side of the inner permeable sheet (D)) and a certain ventilation hole (C) Or (i
i) By forming a perforated laminate packaging material to which the exterior material (F) is adhered on the exterior joining surface side of the interior material via an extruded adhesive layer (E) made of a thermo-adhesive resin, the desired dew condensation can be achieved. The present inventors have found that a perforated laminate packaging material which can easily obtain prevention properties and heat retention properties, has a small number of production steps, and has high production efficiency, and a method for producing the same can be obtained, and have completed the present invention.

That is, [I] The perforated laminate interior material and packaging material of the present invention are composed of the following components. A sheet comprising a permeable sheet (A) and an extruded resin layer (B) having a permeable hole (C) laminated on one side of the permeable sheet (A), wherein the size of the permeable hole (C) is 0.1-3
mm, 0.25 to 8 holes / cm ² , and a vent hole (C) penetrating through the extruded resin layer (B) and reaching the inside of the permeable sheet (A). Perforated laminate interior material. The vent hole (C) has an extruded resin layer (B) and a breathable sheet.
(A) is also characterized by being drilled through. Further, the air permeable sheet (A) and the inner air permeable sheet (D) containing at least 50% by weight or more of the olefin-based molten fiber are laminated via an extruded resin layer (B) having air holes (C). Sheet with a vent hole (C) size of 0.1
３3 mm, 0.25-8 holes / cm ² , penetrate through the inner breathable sheet (D) and the extruded resin layer (B), and reach the inside of the breathable sheet (A) It is a perforated laminated interior material provided with a vent hole (C).

The vent (C) has an inner permeable sheet.
(D), the extruded resin layer (B), and the air-permeable sheet (A). Breathable sheet of perforated laminate interior material described (A)
This is a perforated laminate packaging material in which an exterior material (F) is adhered to the surface side via an extruded adhesive layer (E) made of a thermoadhesive resin.

An extruded adhesive layer made of a thermo-adhesive resin on the side of the air-permeable sheet (A) of the perforated laminate interior material described above
This is a perforated laminate packaging material in which an exterior material (F) is adhered via (E). Breathable sheet of perforated laminate interior material described (A)
This is a perforated laminate packaging material in which an exterior material (F) is adhered to the surface side via an extruded adhesive layer (E) made of a thermoadhesive resin. Breathable sheet of perforated laminate interior material described (A)
This is a perforated laminate packaging material in which an exterior material (F) is adhered to the surface side via an extruded adhesive layer (E) made of a thermoadhesive resin.

The method for producing a perforated laminate interior material of the present invention comprises the following components. A thermoplastic resin is extruded from one side of an extruder through a T-die of an extruder, and immediately after that, the extruded resin layer (B) made of the thermoplastic resin and the permeable sheet (A) are pressed and laminated. At the same time, the size penetrated through the extruded resin layer (B) to reach the inside of the air permeable sheet (A) is 0.1 to 3 m.
m, forming a vent hole (C) of 0.25-8 / cm ² ,
This is a method for producing a perforated laminate interior material. (10) It is also characterized in that the air holes (C) are formed by penetrating the extruded resin layer (B) and the air permeable sheet (A). (11) The air permeable sheet (A) and the air permeable sheet (D) containing at least 50% by weight or more of the olefin-based molten fiber are made to face each other, and a thermoplastic resin is interposed between them by a T-die of an extruder. Extrusion, and immediately thereafter, the air permeable sheet (A) and the inner air permeable sheet (D) are pressed and laminated via the extruded resin layer (B) made of the thermoplastic resin, and at the same time, the inner air permeable sheet (D) is pressed. And penetrated through the extruded resin layer (B) to reach the inside of the permeable sheet (A), and had a size of 0.1 to
This is a method for producing a perforated laminated interior material in which ventilation holes (C) of 3 mm and 0.25 to 8 holes / cm ² are formed. (12) It is also characterized in that the air holes (C) are perforated through the inner air permeable sheet (D), the extruded resin layer (B) and the air permeable sheet (A). Also,

Hereinafter, the present invention will be described in detail with reference to the drawings. (i) Structure of a two-layer perforated laminated interior material and its manufacturing method (claims 1 to 4, 9 to 12) In FIGS. 1 to 4, 1 is a permeable sheet, 2 is an exterior joint surface, 3 is an extruded resin layer, 4 is a non-through-air hole, 5 is a through-air hole, 10A (10B) is a perforated laminated interior material, 30 is a T-die, 31 is a barbed press roll, 32 is a cooling roll,
33 is a guide roll, 31 is a flat press roll, 3
Reference numeral 5 denotes a barbed cooling roll 35.

1) First, a two-layer perforated laminate interior material 10
A manufacturing method of A will be described. FIG. 1 is a schematic diagram illustrating an example of a method for producing a two-layer perforated laminate interior material according to the present invention. The method of manufacturing the two-layer perforated laminate interior material 10A is such that a thermoplastic resin is extruded from one side of a breathable sheet (A) through a T-die of an extruder, and immediately thereafter, an extruded resin layer (B) made of the thermoplastic resin is formed. The air-permeable sheet (A) is pressed and laminated, and at the same time, it penetrates through the extruded resin layer (B) and reaches the inside of the air-permeable sheet (A). ~ 8 pieces / cm ²
To form a two-layer perforated laminate interior material 1
0A (claim 9).

In the method for manufacturing a two-layer perforated laminate interior material shown in FIG. 1, a T-die 30 of an extruder for performing extrusion lamination.
A metal barbed press roll 31 and a rubber cooling roll 32 are provided below. The barbed press roll 31 is shown in FIG.
Numerous projections (for example, having a diameter of 0.1 to 3 mm and a length of 1 to 3) capable of forming the non-through-hole 4 or the through-hole 5 shown in FIGS.
(About 10 mm) on the surface at a rate of 0.25 to 8 / cm ² , preferably 0.5 to 4 / cm ² .

The cooling rolls 32 facing each other have an Hs of 90-9.
5 (JIS-A) hardness, barbed press roll 31
The pressure between the cooling roll 32 and the
Is configured such that the drilling depth can be adjusted. The breathable sheet 1 is supplied from the upper right hand of the cooling roll 32, and the extruded resin layer 3 from the T-die 30 is pressure-bonded between the barbed press roll 31 and the cooling roll 32, and at the same time, the extruded resin layer 3
, And a number of non-penetrating air holes 4 reaching the inside of the air permeable sheet 1 are formed. Cooled barbed press roll 31
The perforated laminated interior material 10A having the two-layer non-through air holes 4 shown in FIG.
3 and wound on a winding roll (not shown).

2) Method for Producing a Two-Layered Perforated Laminate Interior Material 10B FIG. 2 is a schematic diagram illustrating another example of a method for producing a two-layer perforated laminated interior material according to the present invention. The manufacturing method of the two-layer perforated laminate interior material 10B is as follows. A thermoplastic resin is extruded from one side of an air-permeable sheet (A) through a T-die of an extruder, and immediately thereafter, an extruded resin layer (B) made of the thermoplastic resin is formed. At the same time as pressing the air permeable sheet (A) for lamination,
(C) penetrated through the extruded resin layer (B) and the air permeable sheet (A) to have a size of 0.1 to 3 mm, 0.25 to 8 /
A vent hole (C) of cm ² is formed to obtain a two-layer perforated laminated interior material 10B (claim 10).

For example, as shown in FIG. 2, a flat press roll 34 made of rubber and a barbed cooling roll 35 made of metal are used.
(The perforation projection is provided with the same as that of the barbed press roll 31). In this case, the ventilation hole 5 is formed by the extruded resin layer 3 from the air permeable sheet 1 side.
4, the opening on the circumscribed joint side 2 is slightly larger than that of the non-through-hole 4 as shown in FIG. Others were performed similarly to the manufacturing method of the perforated laminated interior material 10A.

3) Next, a two-layer perforated laminate interior material 10
The structure of A (B) will be described. FIG. 3 is a schematic diagram showing a cross-sectional structure of a two-layer perforated laminated interior material 10A having a non-through air hole according to the present invention.
FIG. 4 is a schematic view showing a cross-sectional structure of a two-layer perforated laminate interior material 10B having through-holes according to the present invention. The two-layer perforated laminated interior material 10 of the present invention basically includes a breathable sheet 1 having a vent, an extruded resin layer 3 laminated on one surface of the breathable sheet 1, and a vent. And (A) As shown in FIG. 3, the vent hole 4 is non-penetrating in the two-layer perforated laminate interior material 10A (claim 1), and (B) as shown in FIG. In the material 10B, the ventilation hole 5 is penetrated (claim 2).

The extruded resin layer 3 has a size of 0.1 to 3 mm,
Preferably 0.3 to 1 mm, 0.25 to 8 vents /
It is necessary to have vent holes 4 or 5 of cm ² , preferably 0.5 to 4 / cm ² . In this case, the size 0.
If it is less than 1 mm, the air permeability of the interior material is insufficient, and the structure (of the barbed press roll 31 or the barbed cooling roll 35) is insufficient.
It is not preferable because the needle is easily broken. Further, if the number of air holes is less than 0.25 / cm ² , the air permeability is also insufficient, which is not preferable. On the other hand, when the size exceeds 3 mm, the air permeability increases. When the number of air holes exceeds 8 holes / cm ² , the air permeability becomes too high, so that it is difficult to remove excess water when used as a food packaging material. In other words, when it is used in a microwave oven or the like, the vapor emitted from the food is excessively released, and the flavor of the food is reduced. The material of the breathable sheet 1 is not limited as long as it has the above-mentioned elements, but a sheet having a hygroscopic property and a water absorbing property, for example, a basis weight of 7 to 1
20 g / m ^2, preferably can be mentioned paper 10~50g / m ^2. Also, the basis weight is 15 to 100 g /
m ² , preferably 15 to 50 g / m ² pulp-based nonwoven fabric, 5 to 100 g / m ² , preferably 10 to 50 g / m ²
A g / m ² synthetic resin-based nonwoven fabric is preferred.

The extruded resin layer 3 has a thickness of 5 to 50 μm.
m, preferably a layer of a polyolefin resin such as polyethylene or polypropylene having a thickness of preferably about 7 to 20 μm. The perforated laminate interior material 10A (B) manufactured in this manner can be used alone, but the perforated laminate packaging materials 20A (B) and 21A described later are used.
It can be used as an interior material of (B). In particular, since the perforated laminated interior material 10B has the penetrated air holes 5, the water vapor permeability is higher than that of the perforated laminated interior material 10A having the non-perforated air holes 4.

(Ii) Structure of three-layer perforated laminated interior material and method for producing the same (claims 3 to 4, 11 to 12) In FIGS. 5 to 7, 1 is a breathable sheet, 3 is an extruded resin layer, and 6 is an inner side. Breathable sheet, 11A (B) is a perforated laminated interior material, 33 is a guide roll, 34 is a flat press roll, 35 is a barbed cooling roll, 36 is a breathable sheet supply roll, 37 is an inside breathable sheet supply roll, 38
Denotes a barbed roll, and 39 denotes a brush roll.

1) Manufacturing method of three-layer perforated laminated interior material 11A FIG. 5 shows a three-layer perforated laminated interior material 11A according to the present invention.
It is a schematic diagram explaining an example of the manufacturing method. The method for producing the three-layer perforated laminate interior material 11A is as follows.
And an inner air-permeable sheet (D) containing at least 50% by weight or more of olefin-based molten fibers, and a thermoplastic resin is extruded between them by a T-die of an extruder. At the same time, the air permeable sheet (A) and the inner air permeable sheet (D) are pressed and laminated through the extruded resin layer (B) to penetrate the air permeable sheet (D) and the extruded resin layer (B), A perforated sheet (A) having a size of 0.1 to 3 mm and a size of 0.25 to 8 holes / cm ² is formed by piercing the inside of the air permeable sheet (A) to form a three-layer perforated laminate. The interior material is 11A (claim 11).

For example, a permeable sheet supply roll 36 for supplying the permeable sheet 1 is provided on the upstream side of the flat press roll 34, and an inner permeable sheet 6 for supplying the inner permeable sheet 6 on the upstream side of the barbed cooling roll 35. A permeable sheet supply roll 37 is provided. On the downstream side of the barbed cooling roll 35, a barbed roll 38 for additional perforation and a brush roll 39 are installed facing each other, and then wound around a winding roll (not shown).

The barbed roll 38 and the brush roll 39
The supplementary perforation step by (1) supplements the perforation by the barbed cooling roll 35 described in the method for producing a perforated laminated interior material in (i) -1) and 2). According to this additional perforation step, the air permeability is further increased.
This is effective for manufacturing the laminated perforated interior material 11A (B).

2) A method for producing the three-layer perforated laminate interior material 11B will be described. The method for producing the three-layer perforated laminated interior material 11B is as follows.
Weight percent or more of a breathable sheet (D), and a thermoplastic resin is extruded between them by a T-die of an extruder. Immediately thereafter, an extruded resin layer made of the thermoplastic resin is extruded.
(B) Via permeable sheet (A) and inner permeable sheet (D)
At the same time as pressing and laminating, the air hole (C) has a size of 0.1% penetrated through the inner permeable sheet (D), the extruded resin layer (B) and the permeable sheet (A). ~ 3m
m, a ventilation hole (C) of 0.25 to 8 holes / cm ² is formed,
3 layer perforated laminate interior material 11B (claim 1
2). For example, by using the method of manufacturing a three-layer perforated laminated interior material shown in FIG. 5, the pressing force between the flat press roll 34 and the barbed cooling roll 35 is increased, and the inner permeable sheet 6 and the extruded resin layer 3 are increased. And a large number of air holes 5 penetrating through the air permeable sheet 1. Also, for example, in FIG.
The lower left roll 34 of the T-die 30 may be a barbed press roll, and the lower right roll 35 may be a cooling roll to form the through holes 5 therethrough. Thereby, the ventilation hole 5
The air-permeable sheet 1 is formed to penetrate through the extruded resin layer 3 to the inner air-permeable sheet 6.

3) Three-layer perforated laminate interior material 11A
The structure of (B) will be described. FIG. 6 is a schematic diagram showing a cross-sectional structure of a three-layer perforated laminated interior material 11A having a non-through air hole according to the present invention.
FIG. 7 is a schematic diagram showing a cross-sectional structure of a three-layer perforated laminate interior material 11B having through-holes according to the present invention. The three-layer perforated laminated interior material 11 of the present invention basically includes a breathable sheet 1 having a vent, an inner breathable sheet 6 having a vent, one surface of the breathable sheet 1 and an inner breathable sheet 6. Extruded resin layer 3 laminated between one side
And a vent hole, and the vent hole is (a) as shown in FIG. 6, the vent hole 4 is not penetrated in the perforated laminated interior material 11A (claim 3), or (b) FIG. As shown in (5), in the perforated laminated interior material 11B, the ventilation holes 5 are penetrated (claim 4).

The inner breathable sheet 6 is preferably a breathable sheet containing at least 50% by weight or more of olefin-based molten fibers. The olefin-based molten fiber refers to a fiber made of a polymer having a main skeleton of polyethylene or polypropylene. If the content is less than 50% by weight, the heat sealability at the time of bag making is insufficient, which is not preferable. In this sense, the content is more preferably 70% by weight or more. The components other than the olefin-based molten fibers are not particularly limited, but molten fibers such as pulp, rayon yarn, and polyester are generally used. The basis weight of the inside breathable sheet is 10
70 g / m ^2, preferably in those 15 to 40 g / m ^2. The specific configuration of the components, that is, the breathable sheet 1, the extruded resin layer 3, and the ventilation holes 4, 5 is described in (i) − above.
The description of the structure of the perforated laminate interior material 10A (B) in 3) is applied as it is.

(Iii) Structure of Four-Layer (Five-Layer) Perforated Laminate Packaging Material (Claims 5 to 8) and Method of Producing the Same Two-layer laminate obtained as described in the above (i) and (ii) (3 layers) Perforated laminated interior material 10A (B), 11A
Perforated laminate packaging material 20A (B) using (B), 2
The structure of 1A (B) and its manufacturing method will be described. Fig. 8-
In 12, 1 is a breathable sheet, 2 is an exterior material bonding surface,
3 is an extruded resin layer, 4 is a non-through air hole, 5 is a through air hole,
6 is an inner breathable sheet, 10 and 11 are perforated laminated interior materials, 13 is an embossed pressure-bonded part, 14 is an extruded adhesive layer, 15
Is an exterior material, 20 and 21 are perforated laminate packaging materials, 30 is an extruded adhesive layer, 32 is a cooling roll, and 33 is a guide roll.
40 is an interior material supply roll, 41 is an exterior material supply roll, 4
2 is an embossing roll and 43 is a winding roll.

1) Method for manufacturing a four-layer perforated laminate packaging material 20A FIG. 8 shows a perforated laminate packaging material 20, 21 according to the present invention.
It is a formula explaining one example of the manufacturing method of A (B). The method for producing the perforated laminate packaging material 20A is as follows.
(A), an extruded resin layer (B) laminated on a breathable sheet (A), and a perforated laminated interior material having a vent hole (C). One side of the material (F) is faced, a thermo-adhesive resin is extruded between the two from a T-die of an extruder, and the two are pressed and bonded, and the size of the air hole (C) is zero. .1 to 3 mm, 0.25
８8 holes / cm ² , and pierced through the extruded resin layer (B) to reach the inside of the permeable sheet (A)
(C).

For example, a cooling roll 32 is installed on the lower right side of the T-die 30 and an emboss (press) roll 42 is installed on the lower left side. On the upstream side of the cooling roll 32, an interior material supply roll 40 for supplying the perforated laminated interior material 10 or 11 is installed, and on the upstream side of the emboss (press) roll 42, an exterior material supply for supplying the exterior material 15 is provided. A roll 41 is provided, and a winding roll 43 is provided downstream of the cooling roll 32 and the emboss (press) roll 42.

The emboss (press) roll 42 is
It may be provided with an adhesive projection for bonding or line bonding the exterior material 15 to the perforated laminated interior materials 10 and 11, or may be a flat press roll for bonding the exterior material 15 over the entire surface. The perforated laminated interior materials 10 and 11 from the interior material supply roll 40 are arranged such that the exterior joining surface 2 side of the breathable sheet 1 faces the exterior material 15 side and the cooling roll 32
Supply to The heat-adhesive resin extruded from the T-die 30 is pressed by the bonding protrusions of the emboss (press) roll 42, and as shown in FIG.
3 is formed to adhere the exterior material 15 to the exterior joining surface 2.
Thereby, the exterior material 15 is laminated on the perforated laminated interior materials 10 and 11 via the extrusion adhesive layer 14, and the perforated laminated packaging material 20A is obtained.

2) Manufacturing method of the four-layer perforated laminate packaging material 20B The method of manufacturing the perforated laminated packaging material 20B includes one surface of the air-permeable sheet (A) and an extruded resin layer laminated on the air-permeable sheet (A). (B) and one side of a sheet-like exterior material (F) facing the exterior joining surface side of the perforated laminated interior material having a vent hole (C), and (b) a thermal adhesive property between the two. The resin is extruded from a T-die of an extruder, and the two are pressed and adhered. In addition, the size of the vent hole (C) is 0.1 to 3 mm,
0.25-8 holes / cm ² and extruded resin layer
(B) and the air permeable sheet (A). For example, a four-layer perforated laminate packaging material 20B
Supplies the perforated laminated interior material 10B from the interior material supply roll 40 using the manufacturing method shown in FIG. The material 15 is laminated. In the perforated laminate packaging material 20B thus obtained, the air holes 5 reach the extruded adhesive layer 14, and the permeability into the air permeable sheet 1 is improved.

3) Five-layer perforated laminate packaging material 21A
Manufacturing method of (B) The manufacturing method of the five-layer perforated laminate packaging material 21A is as follows.
0% by weight or more of an inner breathable sheet (D), an extruded resin layer (B) laminated between one side of the breathable sheet (A) and the inner breathable sheet (D), and a vent hole (C ), A sheet-like exterior material
(F) face to face, (b) extruding a thermo-adhesive resin between the two from the T-die of the extruder, and pressing and bonding the two, and the size of the ventilation hole (C) Is 0.1-3
mm, 0.25 to 8 holes / cm ² , and penetrated through the inner breathable sheet (D) and the extruded resin layer (B) to reach the inside of the breathable sheet (A). Is the way. For example, as for the 5-layer perforated laminate packaging material 21A, the perforated laminated interior material 11A is supplied from the interior material supply roll 40 using the manufacturing method shown in FIG. 2, an exterior material 15 via the extrusion adhesive layer 14
Is laminated. In the perforated laminate packaging material 21A thus obtained, the air holes 4 reach the extruded adhesive layer 14, and the permeability into the air permeable sheet 1 is improved. The method for manufacturing the five-layer perforated laminate packaging material 21B is the same as the method for manufacturing the five-layer perforated laminate packing material 21A except that the vent hole (C) is used.
However, the only difference is that it is perforated through the extruded resin layer (B) and the permeable sheet (A).

4) Four-layer perforated laminate packaging material 20A
Structure of (B) FIG. 9 is a schematic diagram showing a cross-sectional structure of a four-layer perforated laminate packaging material having non-through air holes according to the present invention. FIG.
1 is a schematic view showing a cross-sectional structure of a four-layer perforated laminate packaging material having a through-hole according to the present invention. The four-layer perforated laminate packaging material 20A (B) basically includes a breathable sheet 1, an extruded resin layer 3 laminated on one surface of the breathable sheet 1, a size of 0.1 to 3 mm, 0.25 ~ 8 pieces / c
A structure in which an exterior material 15 is adhered to an exterior joining surface side of a perforated laminated interior material having a vent hole 4 or 5 of m ² via an extruded adhesive layer 14 made of a thermoadhesive resin. ,
In addition, as shown in FIG.
Is penetrated to reach the inside of the air permeable sheet 1,
Four-layer perforated laminate packaging material 20 having non-penetrating vents 4
A (claim 5) or (b) as shown in FIG. 10, a four-layer perforated laminate having through-holes 5 penetrating through the extruded resin layer 3 and the permeable sheet 1. The packaging material 20B is used (claim 6).

Here, the exterior material 15 has a basis weight of 7 to 5
0 g / m ^2, preferably 15 to 40 g / m ² paper, or thickness 10 to 100 [mu] m, preferably synthetic resin film 15 to 50 m (for example, vinyl chloride resin, polyolefin resin, films such as polyester) is desirable .
As the extruded adhesive layer 14, 5 to 30 μm, preferably 7 μm
A heat-adhesive resin film having a thickness of about 20 μm is desirable,
For example, polyolefins such as polyethylene and polypropylene, polyamides and the like can be suitably used. The details of the other components, that is, the air permeable sheet 1, the extruded resin layer 3, the non-through air holes 4, the through air holes 5, and the inner air permeable sheet 6 are described in the above items (i) and (ii). As you did.

5) Five-layer perforated laminate packaging material 21A
(B) Structure FIG. 11 is a schematic diagram showing a cross-sectional structure of a five-layer perforated laminate packaging material 21A having non-through air holes according to the present invention. FIG. 12 is a schematic diagram showing a cross-sectional structure of a five-layer perforated laminate packaging material 21B having through-holes according to the present invention. The five-layer perforated laminate packaging material 21A (B) was basically laminated between the breathable sheet 1, the inner breathable sheet 6, and one surface of the breathable sheet 1 and one surface of the inner breathable sheet 6. Extruded resin layer 14, size 0.1-3m
m, on the exterior joining surface side of a perforated laminated interior material having ventilation holes 4 or 5 of 0.25 to 8 holes / cm ² , via an extruded adhesive layer 14 made of a thermoadhesive resin, However, is the vent hole 4 or 5 penetrated through the inner permeable sheet 6 and the extruded resin layer 14 to reach the inside of the permeable sheet 1 as shown in FIG. (Claim 7) or (b) As shown in FIG. 12, the inner permeable sheet 6, the extruded resin layer 14, and the permeable sheet 1
(Claim 8).

(Iv) Features of perforated laminate packaging material 1) Features of perforated laminate packaging material (claims 1, 2,
5, 6) In the perforated laminate interior material 10A (FIG. 3) and the perforated laminate packaging material 20A (FIG. 9), the extruded resin layer 3 becomes a sealant layer with the inside of the bag body, and the non-penetrating air holes 4 are formed of food. It becomes a passage for excess water, oil, water vapor and the like coming out of the air-permeable sheet 1 and is absorbed, absorbed, and absorbed in the air-permeable sheet 1 to help maintain the flavor of the food. Furthermore, by combining the exterior material 15, the release of water or oil that has come out is blocked, and the release of hot air is suppressed. In particular, the perforated laminated interior material 10B (FIG. 4) having the through-holes 5 and the perforated laminated packaging material 20B (FIG. 10) are suitable for packaging foodstuffs that generate a lot of moisture and oil.

2) Characteristics of the perforated laminate packaging material (claims 3, 4, 7, 8) The perforated laminate interior material 11A (FIG. 6) and the perforated laminate packaging material 21A (FIG. However, inside the bag, a sealant layer is formed, and the non-penetrating breathable sheet 4 becomes a passage for excess water, oil, water vapor, etc. coming out of the food, so that moisture absorption, water absorption, and oil absorption are formed in the breathable sheet 1. It helps preserve the flavor of the food. Further, in these packaging materials, since the food is in contact with the inner breathable sheet, the portion where the substrate and the food are in contact is smaller than when the food is in contact with the film-like material, and an air layer is included therebetween. As such, excess water and oil do not impair the flavor of the food.
Furthermore, by combining the exterior material 15, the release of water or oil that has come out is blocked, and the release of hot air is suppressed. In particular, the perforated laminate interior material 11B having the through holes 5 (FIG. 7) and the perforated laminate packaging material 21B (FIG. 1)
2) is suitable for packaging of foodstuffs that generate a lot of moisture and oil.

3) Other features of the perforated laminate packaging material The perforated laminate packaging material is provided for food packaging in a state of a sheet or processed into a bag. In addition, bags using perforated laminate packaging materials are used, for example, for sealing frozen foods and for heat treatment in a microwave oven. The steam released from the bag fills the bag body, and the whole food can be finished plumply. And breathable sheet 1
The heat retention is maintained at the same time, and the steam having increased pressure is released to the outside little by little through the exterior material 15.

[0037]

As described above, according to the perforated laminate packaging material of the present invention and the method of manufacturing the same, the formation of the air holes in the perforated laminate packaging material is performed simultaneously with the extrusion lamination, so that the perforated laminate interior material is produced. With a simple manufacturing process, it can be manufactured with high production efficiency. Therefore, there is an effect that the perforated laminate interior material and the perforated laminate packaging material excellent in the dew condensation prevention property and the heat retaining property can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic view illustrating an example of a method for producing a two-layer perforated laminated interior material according to the present invention.

FIG. 2 is a schematic view illustrating another example of the method for producing a two-layer perforated laminate interior material according to the present invention.

FIG. 3 is a schematic diagram showing a cross-sectional structure of a two-layer perforated laminated interior material 10A having a non-penetrating vent according to the present invention.

FIG. 4 is a schematic diagram showing a cross-sectional structure of a two-layer perforated laminated interior material 10B having through-holes according to the present invention.

FIG. 5 is a three-layer perforated laminate interior material 11A according to the present invention.
It is a schematic diagram explaining an example of the manufacturing method of (B).

FIG. 6 is a schematic view showing a cross-sectional structure of a three-layer perforated laminated interior material 11A having a non-penetrating air hole according to the present invention.

FIG. 7 is a schematic diagram showing a cross-sectional structure of a three-layer perforated laminated interior material 11B having through-holes according to the present invention.

FIG. 8 shows a perforated laminate packaging material 20, 21 according to the invention.
It is a schematic diagram explaining an example of the manufacturing method.

FIG. 9 is a schematic diagram showing a cross-sectional structure of a four-layer perforated laminate packaging material 20A having non-through air holes according to the present invention.

FIG. 10 is a schematic diagram showing a cross-sectional structure of a four-layer perforated laminate packaging material 20B having through holes according to the present invention.

FIG. 11 is a schematic diagram showing a cross-sectional structure of a five-layer perforated laminate packaging material 21A having a non-through air hole according to the present invention.

FIG. 12 is a schematic diagram showing a cross-sectional structure of a five-layer perforated laminate packaging material 21B having through-holes according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Breathable sheet 2 Exterior joint surface 3 Extruded resin layer 4 Non-through air hole 5 Through air hole 6 Inner air permeable sheet 10A, B 2 layer perforated laminated interior material 11A, B 3 layer perforated laminated interior material 13 Embossed crimping part Reference Signs List 14 extrusion adhesive layer 15 exterior material 20A, B 4 layers perforated laminated packaging material 21A, B 5 layers perforated laminated packaging material 30 T die 31 barbed press roll 32 cooling roll 33 guide roll 34 flat press roll 35 barbed cooling roll 36 air-permeable sheet supply roll 37 inner air-permeable sheet supply roll 38 barbed roll 39 brush roll 40 interior material supply roll 41 exterior material supply roll 42 emboss roll 43 take-up roll

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takao Wada 144 Ukino-cho, Nishi-ku, Nagoya-shi, Aichi

Claims (12)

[Claims] 1. A breathable sheet (A) and a breathable sheet (A)
Extruded resin layer with ventilation holes (C) laminated on one side
(B), wherein the size of the ventilation holes (C) is 0.1 to 3 mm, 0.25 to 8 holes / cm ² , and penetrates the extruded resin layer (B). And a perforated laminate interior material comprising a vent hole (C) penetrating into the permeable sheet (A). 2. A perforated laminate according to claim 1, wherein said air holes (C) are formed by penetrating through the extruded resin layer (B) and the air permeable sheet (A). Interior materials. 3. An air-permeable sheet (A) and an inner air-permeable sheet (D) containing at least 50% by weight or more of olefin-based molten fibers are interposed through an extruded resin layer (B) having air holes (C). A laminated sheet having a vent hole (C) having a size of 0.1 to 3 mm, 0.25 to 8 holes / cm ² , and an inner breathable sheet (D) and an extruded resin. A perforated laminated interior material comprising a ventilation hole (C) penetrating the layer (B) and reaching the inside of the permeable sheet (A). 4. The air-permeable sheet (D) wherein the ventilation hole (C) has an inner permeable sheet (D).
The perforated laminated interior material according to claim 3, characterized in that it is perforated through the extruded resin layer (B) and the breathable sheet (A). 5. An exterior material (F) is bonded to the perforated sheet (A) side of the perforated laminated interior material according to claim 1 via an extruded adhesive layer (E) made of a thermo-adhesive resin. A perforated laminate packaging material characterized by comprising: 6. An exterior material (F) is adhered to the perforated sheet (A) side of the perforated laminated interior material according to claim 2 via an extruded adhesive layer (E) made of a thermo-adhesive resin. A perforated laminate packaging material characterized by comprising: 7. An exterior material (F) is adhered to the perforated sheet (A) side of the perforated laminated interior material according to claim 3 via an extruded adhesive layer (E) made of a thermo-adhesive resin. A perforated laminate packaging material characterized by comprising: 8. An exterior material (F) is adhered to a perforated sheet (A) side of the perforated laminated interior material according to claim 4 via an extruded adhesive layer (E) made of a thermoadhesive resin. A perforated laminate packaging material characterized by comprising: 9. A thermoplastic resin is extruded from one side of an air permeable sheet (A) through a T-die of an extruder. Immediately thereafter, an extruded resin layer (B) made of the thermoplastic resin and a gas permeable sheet (A) are formed. At the same time as pressing and laminating, through the extruded resin layer (B), it reaches the inside of the air permeable sheet (A), and the perforated sheet has a size of 0.1 to 3 mm and 0.25 to 8 pieces / cm ² . Pore (C)
Forming a perforated laminated interior material. 10. The method for producing a perforated laminated interior material according to claim 9, wherein said air holes (C) penetrate through the extruded resin layer (B) and the air permeable sheet (A). 11. A T-die of an extruder, wherein a permeable sheet (A) and an inner permeable sheet (D) containing at least 50% by weight or more of olefin-based molten fibers are opposed to each other, and a thermoplastic resin is interposed therebetween. More extruded, immediately after the breathable sheet (A) through the extruded resin layer (B) made of the thermoplastic resin
And the inner breathable sheet (D) is pressed and laminated, and at the same time, it penetrates through the inner breathable sheet (D) and the extruded resin layer (B), reaches the inside of the breathable sheet (A), and is pierced. A method for producing a perforated laminated interior material, comprising forming ventilation holes (C) having a size of 0.1 to 3 mm and 0.25 to 8 holes / cm ² . 12. The air vent (C) is formed by penetrating through the inner permeable sheet (D), the extruded resin layer (B) and the permeable sheet (A). Item 12. The method for producing a perforated laminated interior material according to Item 11.