JP4327784B2 - Laminated film or sheet having foamed resin layer and method for producing the same - Google Patents

Description

  The present invention relates to a laminated film or sheet and a method for producing the same, and more particularly to a laminated film or sheet having a specific thermoplastic resin foam layer formed by foaming during extrusion lamination and a method for producing the same.

  Conventionally, paper used for containing and packaging heated or cooled foods and beverages, containers, films, and sheets made of a base material such as polyester, in order to impart heat insulation properties to the paper or For example, a resin foam layer made of, for example, a vinyl chloride resin, a polystyrene resin, a polyurethane resin, a polyolefin resin, or the like is frequently laminated on the surface of a plastic substrate. Many inventions have already been proposed.

  For example, in Patent Document 1, a blank sheet is produced by punching a laminated sheet provided with a paper layer as a base material and a polypropylene resin layer as an innermost layer and a layer of low density polyethylene or a copolymer thereof as an outermost layer as a foam layer. A paper container in which a resin foam layer is formed by foaming in a heating furnace after forming the blank board into a container shape is disclosed. Patent Document 2 discloses a polyethylene resin foam layer from the inner surface to the outer surface, A heat insulating bag made of a laminated sheet laminated in the order of a polyethylene resin heat-fusible layer and a substrate is disclosed.

  Further, Patent Document 3 discloses an ethylene / α-olefin polymerized using a metallocene catalyst as a synthetic resin in a foamed laminated sheet formed with a foamed layer composed of a synthetic resin composition mainly composed of an olefin resin. Foam made of a synthetic resin composition in which a copolymer is mixed with at least one selected from low density polyethylene, linear low density polyethylene and olefin rubber, and a foaming agent is added to this synthetic resin. An invention of a foamed laminated sheet obtained by laminating a heat-resistant synthetic resin layer with a substrate and then foaming by heating is disclosed.

  A laminated film or sheet obtained by laminating such a resin foam layer on a base material or a molded product made of them is, for example, a container, a sheet, or the like as in Patent Document 1 or Patent Document 3 or the like. After forming into an article shape, the resin foam layer is formed by heating and foaming to obtain a product, or already foamed as in the invention of the method for producing a polypropylene resin laminated foam sheet described in Patent Document 4. In general, a non-foamed resin layer or a base film is laminated on a sheet-like material by extrusion lamination or the like.

  In the above general method, since the resin foaming step and the laminating step are performed in separate steps, much labor and time are required, and there is a problem in terms of productivity improvement.

Even in an attempt to rationalize the above processes and further reduce production costs, a specific case, for example, a base material and a foam layer are both thermoplastic resins that can be extruded, and both are, for example, polyethylene resins. In the case of substantially the same kind of material, it has already been proposed.
A resin melt for forming a resin layer made of a polyethylene resin composition and a resin composition for forming a foam layer made of a polyethylene resin composition are introduced into an annular die and coextruded from the annular die, thereby at least forming the foam layer. It describes that a cylindrical laminated foam having a resin layer laminated on one side is formed.

  However, the method of Patent Document 5 described above may be used when the base material and the resin constituting the foamed layer are different, particularly when the base material is not a thermoplastic resin such as paper, or even if it is a thermoplastic resin. When the difference in physical properties such as the melting point between the base resin and the foamed layer resin is large and the coextrusion is not possible, the above method cannot be adopted. Therefore, the above proposal is sufficient for the conventional request. I couldn't say it was a response.

Japanese Patent Laid-Open No. 2003-341752 JP 2001-270572 A JP 11-129421 A JP 2005-119147 A JP 2004001401 A

  The present inventors have been searching for various solutions that can be widely responded to the above-mentioned demands. For example, foaming agents such as olefin polymer compositions can be applied to substrates such as paper, aluminum foil, and PET resin. When laminating the containing thermoplastic resin composition, the idea was to complete the formation of a foamed layer in the apparatus at the same time during the lamination operation using an extrusion laminating apparatus.

  As a result, the present inventors have completed a method capable of obtaining a product that is almost satisfactory, except when forming a foam layer having a particularly high expansion ratio or when operating under operating conditions at a particularly high processing speed.

Furthermore, unexpectedly, in the course of the investigation, a thermoplastic resin composition containing a foaming agent and a thermoplastic resin or resin composition containing no foaming agent are melt-coextruded from an extrusion laminator die, and the co-extruded product. A thermoplastic resin containing the foaming agent, which is drawn by passing through a gap between a cooling roll and a nip roll in a state in which one side of the extruded molten web and one side of the base material are superposed on each other. A laminated film or sheet obtained by a specific method of foaming and completing foam layer formation after the composition exits the die and finishes passing through the gap between the cooling roll and the nip roll has an infinite number of fine foam layers. A long and narrow foam cell group, and from the local density of the dispersion density of the foam cell group, the appearance is a cloudy glassy translucent ground with a vertical stripe pattern, and is used as a decorative product. Discovered it could also sufficiently utilized, the present invention has been completed based on this finding.

  Accordingly, an object of the present invention is to provide a laminated film or sheet in which a foam layer useful as a raw material for producing paper containers, aluminum foil containers, packaging films, sheets and the like with heat insulation properties is laminated on a substrate. And providing a method for producing the laminated film or sheet simply, with good productivity and at low cost.

  Another object of the present invention is to contain a myriad of fine elongated foam cells, and from the local density of the dispersion density of the cells, the appearance of streaky stripes on the frosted glassy translucent ground. An object of the present invention is to provide a laminated film or sheet useful as a decorative article material on which a foamed layer to be presented is laminated, and to provide a method for producing the laminated film or sheet simply and with good productivity at low cost.

According to the present invention, a laminated film or sheet comprising at least a substrate, a thermoplastic resin foam layer, and a thermoplastic resin non-foam layer ,
The thermoplastic resin foam layer is formed by foaming when a thermoplastic resin composition containing a foaming agent and a thermoplastic resin or resin composition not containing a foaming agent are co-extruded and laminated on a base material. A laminated film characterized by containing fine elongated foam cell groups and having a stripe-like streak pattern on a cloudy glassy translucent ground due to the local density of the dispersion density of the foam cell groups Or a sheet is provided.

The expansion ratio of the thermoplastic resin foam layer is preferably 1.2 to 5 times.

Moreover, it is preferable that the thermoplastic resin which comprises the said foaming layer consists of an ethylene-type polymer.

It is preferable that the thermoplastic resin non-foamed layer is a transparent layer or a colored layer and is laminated on one surface side of the thermoplastic resin foamed layer.

Further, according to the present invention, a thermoplastic resin or resin composition containing no foaming agent and the foaming agent-containing thermoplastic resin composition from coextrusion laminator die melt co-extrusion, the co-extruded molten web In the method for producing a laminated film or sheet, the method includes a step of passing through a gap between a cooling roll and a nip roll in a state where one surface and one surface of a base material are overlapped, and thermally bonding and laminating the both. Provided is a method for producing a laminate in which a foamed layer is completely formed by foaming from the time when the agent-containing thermoplastic resin composition exits the die and finishes passing through the gap between the cooling roll and the nip roll. Is done.

In each of the above methods of the present invention, the foam layer is preferably formed by adjusting the extrusion resin temperature of the extrusion laminator, the processing speed, the air gap, and the gap length between the cooling roll and the nip roll.
Furthermore, the adjustment is in the range of 150 to 300 ° C. The extruded resin temperature in the range of the extrusion laminator processing rate 5~150m / min, the range of 50~150mm the air gap, the gap length between the cooling roll and the nip roll 0 It is preferable to adjust each within a range of ˜2 mm.

Above, as mentioned, the laminated film or sheet having a foamed layer of the present invention, the a foaming agent-containing thermoplastic resin composition and the blowing agent-containing thermoplastic resin or resin composition by co-extrusion foaming laminated to the substrate The foam layer is characterized in that it is formed simultaneously with the lamination to the base material, and this foam layer contains an infinite number of fine elongated foam cell groups, thereby imparting high heat insulation to the base material, Moreover, due to the local shading of the dispersion density, the appearance shows a streaky pattern of vertical stripes on a frosted glassy translucent ground.

Thereby, the laminated film or sheet of the present invention is a raw material for producing paper containers, aluminum foil containers, packaging films, sheets, etc., which are provided with heat insulation necessary to accommodate high-temperature foods and beverages. It is also useful as a material for producing decorative articles that require an aesthetic appearance.
Further, according to the method of the present invention, the laminated film or sheet can be produced simply and with good productivity at low cost.

Embodiments according to the present invention will be described below in detail and specifically with reference to the drawings.
FIG. 1 shows an example of an apparatus (extrusion laminator) for producing a laminated film or sheet according to the present invention.
In the apparatus 10 of FIG. 1, reference numeral 1 is a cooling roll, 2 is a nip roll, 3 is a co-extrusion die (however, the display of the flow paths other than the main flow path in the co-extrusion resin flow path is omitted) . Material 5 is a melt polymer flow path in the die, 5 'is a manifold, 6 is a laminated film, 7 is an air gap, 8 is a gap between the cooling roll 1 and the nip roll 2, and a is a melt web .

For example, in order to produce the laminated sheet of the present invention in which one non-foamed resin layer is laminated on the foamed layer using the apparatus 10, first, the base material layer 4 such as paper or PET is used. While being along the nip roll 2, it is fed into the gap 8 between the nip roll 2 and the cooling roll 1, and taken up along the cooling roll 1.
At this time, after the melted foaming agent-containing resin composition layer and the foaming agent-free resin composition layer were pressed down from the flow path 5 in the coextrusion die 3, and expanded to the full width of the die with the manifold 5 ′, Extruded out of the coextrusion die 3 as a two-layer molten web a. At that time, the foaming agent-containing resin composition layer was coextruded from the flow path on the side in contact with the base material surface, and the foaming agent-free resin composition layer was coextruded from the flow path on the side away from the base material, and extruded foam. While the molten web of the agent-containing resin composition layer is foamed, one surface is thermally bonded to the base material and the other surface is thermally bonded to the non-foaming agent-containing resin composition molten web layer.

Of the two layers of molten web a extruded out of the coextrusion die 3, the foaming agent-containing resin composition layer immediately starts foaming, and continues the laminar foaming while flowing down the distance of the air gap 7. The foaming agent-containing molten web layer and the base material layer 4 are pressure-bonded to each other and the foam layer is formed and the layer, the base material layer, and the foaming agent non-sticking are formed. Lamination of the containing resin composition layer is completed simultaneously. And a laminated sheet is obtained by taking this.

The laminated sheet thus obtained has an infinite number of elongated foamed cells in the foamed polymer layer, and the appearance is schematically shown in FIG. As shown in Fig. 4, vertical stripes appear on the frosted glassy translucent ground.
Thereby, the laminated sheet of the present invention not only has excellent heat insulation, but also has an aesthetic effect based on the above pattern and also has excellent decorativeness.

  The expansion ratio of the foamed resin layer is 1.2 to 5 times, more preferably 1.5 to 4 times the layer thickness in the unfoamed state. From the viewpoints of the aesthetic effect of the property and appearance pattern, etc.

  As a base material used for the laminated film or sheet of the present invention, a base material made of a substance that can be processed in a processing apparatus line such as an extrusion laminator and can be thermally bonded to a foamed layer resin. If it can be used, there is no particular limitation.

As a base material in the present invention, a polyester resin such as PET resin, a polyamide resin such as nylon 6 resin, a polyolefin resin such as polypropylene resin, a metal foil such as aluminum foil, paper, non-woven fabric, felt Among them, paper, PET, and aluminum foil are particularly preferable.
Moreover, when a base material consists of resin films or sheets, such as a polyester-type resin and a polyamide-type resin, what has a stretching orientation is more preferable.

Next, as the thermoplastic resin used in the foaming agent-containing thermoplastic resin composition for forming the foamed layer in the present invention,
It can be used without particular limitation as long as it is a thermoplastic resin that can be thermally bonded to the base material and can form a foamed film. Examples of such resins include polyester resins, polyamide resins, Polyolefin resins can be exemplified, but among these, polyolefins, particularly ethylene polymers are preferred.
As the ethylene polymer, in addition to polyethylenes such as high density polyethylene, low density polyethylene, linear low density polyethylene, metallocene catalyzed polymerized linear low density polyethylene, ethylene / α-olefin mainly composed of ethylene Copolymers such as ethylene and propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 4-methyl-1-pentene, etc. A polymer can be mentioned .

Also, ethylene / unsaturated carboxylic acid copolymer or ethylene / unsaturated carboxylic acid ester copolymer mainly composed of ethylene, such as ethylene and acrylic acid, methacrylic acid, ethacrylic acid, fumaric acid, maleic acid, maleic acid Copolymers with unsaturated carboxylic acids such as monoalkyl and maleic anhydride, or unsaturated ethylene and alkyl acrylate, methacrylate, alkyl ethacrylate, dialkyl fumarate, dialkyl maleate, etc. Copolymers with carboxylic acid esters are also preferred .
In addition, as said alkyl ester, ester, such as methyl, ethyl, n-butyl, i-butyl, 2-ethylhexyl, isooctyl, can be mentioned as a suitable example.

Further, multi-component copolymers such as ethylene, unsaturated carboxylic acid, unsaturated carboxylic acid ester terpolymer comprising ethylene and the above unsaturated carboxylic acid and unsaturated carboxylic acid ester,
Zinc or alkali metal ionomer of the ethylene / unsaturated carboxylic acid copolymer or ethylene / unsaturated carboxylic acid / unsaturated carboxylic acid ester terpolymer,
Further, ethylene / vinyl acetate copolymers and partially saponified products thereof, ethylene / vinyl propionate copolymers and partially saponified products thereof, and ethylene-based polymers such as polyvinyl alcohol can be exemplified.
Furthermore, a resin composition in which two or more of these polymers are mixed can also be used.

  Of these, low-density polyethylene such as low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed polymerized linear low-density polyethylene, and ethylene / unsaturated carboxylic acid copolymers such as ethylene (meth) acrylic acid copolymer. Polymers and ionomers such as alkaline earth metals or alkali metal ionomers of ethylene (meth) acrylic acid copolymers can be preferably used. Among them, particularly preferred polymers are ethylene (meth) acrylic acid copolymers. Zinc ionomer, sodium ionomer, and potassium ionomer, most preferably zinc ionomer and sodium ionomer having a neutralization degree of 90 mol% or more of an ethylene (meth) acrylic acid co-layer having a (meth) acrylic acid content of 5 to 30% by weight. , Potassium ionomer.

  As the foaming agent to be blended in the polymer composition, it can be uniformly dispersed and mixed in the polymer resin, and foams in the polymer composition at or near the melting temperature of the composition. Any suitable foaming agent is preferably selected in consideration of the melting temperature, melt viscosity, and other physical properties of the polymer.

Typical inorganic foaming agents that can be used in the present invention include, for example, sodium bicarbonate (sodium bicarbonate), ammonium bicarbonate, ammonium carbonate and the like, and organic foaming agents include N, N ′. -Dinitroso pentamethylene tetramine (DPT), azodicarbonamide (ADCA), azobisisobutyronitrile, benzene sulfonyl hydrazide, 4,4'-oxybis (benzenesulfonyl hydrazide), toluene sulfonyl hydrazide, p -Toluene sulfonyl semicarbazide, barium azodicarboxylate, etc. can be mentioned.
Furthermore, so-called water foaming using water (water vapor) can be employed, and examples of the foaming agent used include water, inorganic substances containing crystal water, and hygroscopic resins (potassium ionomer, etc.).

  Such a foaming agent is, for example, uniformly mixed with a small amount of the same or similar polymer as the constituent polymer of the foamed resin layer such as polyethylene, and if necessary, an additive such as a foaming aid is blended into a master batch. Is sold as a commercial product (for example, Polyslen EE), and it is convenient to use it.

  The blending ratio of the foaming agent to the ethylene polymer composition varies depending on the type of foaming agent and polymer used, the thickness of the foamed layer to be formed, the foaming ratio, etc., and is appropriately determined in consideration of them. However, 100 ppm to 30% by weight is usually preferable with respect to 100 parts by weight of the resin. For example, when the polymer is an ethylene / methacrylic acid copolymer zinc ionomer and the foam layer thickness is about 100 μm and the foaming ratio is about twice, Polyslen EE205D (PE-based 20% concentration, carbon dioxide foaming inorganic foaming agent) foaming agent In general, about 2 to 5 parts by weight per 100 parts by weight of the composition is used.

In the laminated film or sheet of the present invention, the foamed resin layer formed by coextrusion with the foaming agent-free resin layer has a basic structure that exists only on one side of the base material, depending on its use, It may be present on both sides of the substrate, or conversely, a foamed resin layer and a non-foamed resin layer may be sandwiched between two substrates.

In the laminated film or sheet of the present invention, at least one foaming agent-free resin layer is laminated on the foamed resin layer by coextrusion.
The resin used for such a foaming agent-free resin layer can be used without particular limitation on the assumption that it can be laminated on the base material or the foamed layer resin, and specifically, used for the foamed layer. The thing similar to resin can be mentioned.
In particular, it is preferable to select a resin having thermal adhesiveness to the resin within a melting point range capable of coextrusion with the foaming agent-containing resin composition.
For example, as a suitable example thereof, there can be mentioned an embodiment in which at least one layer made of an ethylene polymer not containing a foaming agent is further laminated.
For example, a layer of an ethylene polymer layer that does not contain a foaming agent is laminated on the surface of the foamed resin layer, and further, a layer of an ethylene polymer layer that does not contain a foaming agent is also laminated on the substrate surface side of the laminate of the structure Etc. can be illustrated.

  Among these, in particular, the foaming agent-free thermoplastic resin layer is a transparent layer or a colored layer, and a resin layer not containing a foamed layer is laminated on one side of the foamed layer made of the thermoplastic resin composition. This embodiment is preferable in that the surface of the foam layer can be protected from abrasion damage and the decorative effects of the foam layer of the present invention can be more varied.

The following can exemplified as a typical layer structure of the multilayer film or sheet of the present invention.
1) (Transparent) resin layer / foamed layer / substrate
2) Foamed layer / base material / resin layer,
3) Foamed layer / resin layer / base material,
4) (Transparent) resin layer / foamed layer / base material / resin layer,
5) (Transparent) resin layer / foamed layer / resin layer / base material / resin layer

Each thickness of the base material, the foamed layer, and the (non-foamed) resin layer in the laminated film or sheet of the present invention is not particularly limited, and the layer configuration, use, and other conditions of the laminated film or sheet However, in general, the substrate thickness is about 5 to 1000 μm, particularly 10 to 500 μm, and the thickness of the foam layer depends on the foaming ratio and the like, and varies within a considerable range. Generally, about 5 to 1000 μm, particularly 10 to 500 μm is preferable.
The thickness of the non-foamed resin layer is appropriately set according to the purpose of lamination, but is usually preferably about 3 to 100 μm.

In the device you produce a laminated film or sheet of the present invention is slightly wider set than in the case of lamination of a non-foamed resin layer the gaps of the cooling roll and a nip roll from the relationship to lamination of the resin layer of the foamed state.

In the method for producing a laminated film or sheet of the present invention using the apparatus, the foam layer formation timing is adjusted mainly by the extrusion resin temperature, the extrusion laminator processing speed (take-off speed), the air gap, and the cooling roll. This is done by adjusting the gap of the nip roll.
These adjustments are appropriately made in consideration of the material of the laminated film or sheet to be manufactured, the size such as the thickness and width, the polymer material of the foamed layer, the type of foaming agent, the foaming ratio, the layer thickness, etc. Generally, the extrusion resin temperature is in the range of 150 to 300 ° C., the extrusion laminator processing (take-off) speed is in the range of 5 to 150 m / min, the air gap is in the range of 50 to 150 mm, the cooling roll It is preferable that the gap length between the nip roll and the nip roll is adjusted in the range of 0 to 2 mm.

The present invention will be specifically described by the following examples, but the present invention is not limited to these examples.
"Example 1"
A coextrusion laminator (extruder: 65 mmφ diameter, die: 850 mm width, cooling roll 600 mmφ, nip roll 250 mmφ) in which the die portion of the extrusion laminator shown in FIG. 1 is replaced with a coextrusion die is used. The gap was adjusted to about 0.1 mm and the air gap was set to 110 mm.
Also, a PET film (thickness 12 mm, width 500 mm, laminated side corona treatment) is used as a base material, and a foaming agent (polyethylene base coating) is added to a zinc ionomer (Himiran 1650) of an ethylene / methacrylic acid copolymer as a resin composition for a foam layer. 20% concentration master batch, carbon dioxide foaming: Polyslene EE205D) blended at 97.5 / 2.5 (weight ratio), and ethylene ion / methacrylic acid copolymer zinc ionomer (Himiran 1650) (foaming agent) (Not contained) was prepared.
Then, these are loaded into the respective predetermined loading locations of the coextrusion laminator so that the laminated structure is a base material / foam layer / (foaming agent-free) resin layer, the resin temperature is 260 ° C., and the processing (take-off) speed is Under the condition of 40 m / min, the resin composition for a foam layer and the resin (containing no foaming agent) were coextruded at a thickness of 20 μm, and extrusion foaming lamination was performed.

The obtained laminated film (Example product 1) has a foam layer thickness of 90 μm, a foaming ratio of 2.3 times, a foamed state is good, and contains an infinite number of fine elongated foam cell groups. As shown in FIG. 2, a striped streak pattern was formed on a frosted glassy translucent ground.
Moreover, the heat conductivity of this laminated film was 0.098 (W / m · k). The test method for thermal conductivity is as follows.
Test conditions Test equipment: GH-1 (Alpac Riko)
Measurement method: steady state thermal flow meter method Measurement temperature: 25 ° C
Sample size 50φ x sample thickness

“Examples 2 to 4”
Example 1 except that the processing (take-off) speed condition, roll gap, foam layer resin composition and foaming agent-free resin coextrusion thickness in Example 1 were changed to the conditions shown in Table 1, respectively. Extrusion foam lamination was performed in the same manner.
The results are shown in Table 1.

" Comparative example 1 "
An extrusion laminator equipped with a T die (extruder: 65 mmφ diameter, T die: 850 mm width, cooling roll 600 mmφ, nip roll 250 mmφ), the gap between the cooling roll and nip roll of the apparatus is about 0.1 mm, and the air gap is 110 mm. PET film (thickness 12 mm, width 500 mm, laminated side corona treatment) as a base material, ethylene ion / methacrylic acid copolymer zinc ionomer (Himiran 1650) as a foam layer resin composition, foaming agent (Polyslen) EE205D) blended at 99 / 1.0 was prepared.
Then, these are loaded into a predetermined loading place of the extrusion laminator, and the above resin composition for the foam layer is extruded in a single layer at a thickness of 20 μm under the conditions of a resin temperature of 260 ° C. and a processing (take-off) speed of 80 m / min, and extrusion. Foam lamination was performed.
Table 1 shows the results of evaluation of the obtained laminated film (single-layer extrusion) in the same manner as in Example 1.

"Example 5 "
In Example 1, the degree of neutralization of the ethylene / methacrylic acid copolymer (methacrylic acid content: 15% by weight) was added to the ethylene ion / methacrylic acid copolymer zinc ionomer (Himiran 1650). Replacing with a composition in which 85 mol% of potassium ionomer is mixed at a ratio of 7/3 (weight ratio), the foaming is water foaming, the resin temperature is 280 ° C., and the processing (take-off) speed is 20 m / min. Extrusion foam lamination was carried out in the same manner as in Example 1 except that the coextrusion thickness of the composition and the foaming agent-free ionomer resin was changed to 40 μm, and the obtained laminated film was evaluated in the same manner as in Example 1. .
The results are shown in Table 1.

"Example 6 "
In Example 1, the resin composition for the foam layer was changed to one in which a foaming agent (Polyslen EE205D) was blended at a ratio of 95 / 5.0 to a zinc ionomer (Himiran 1650) of an ethylene / methacrylic acid copolymer. Except for the above, extrusion foaming lamination was carried out in the same manner as in Example 1, and the obtained laminated film was evaluated in the same manner as in Example 1.
The results are shown in Table 1.

"Example 7 "
Extrusion foam lamination was carried out in the same manner as in Example 6 except that the layer structure was changed to base material / resin layer / foamed layer, and the obtained laminated film was evaluated in the same manner as in Example 1.
The results are shown in Table 1.

使用樹脂:S=基材(PET、A=亜鉛アイオノマー(ハイミラン1650)
B=カリウムアイオノマー(SD200)
発泡剤 MB:ポリエチレンベースの20%濃度のマスターバッチ(永和化成工業(株)
のポリスレンEE205D)

Resin used: S = Base material (PET, A = Zinc ionomer (High Milan 1650))
B = Potassium ionomer (SD200)
Foaming agent MB: 20% concentration masterbatch based on polyethylene (Eiwa Chemical Industry Co., Ltd.)
(Polyslen EE205D)

The schematic diagram which shows an example of the extrusion foaming laminator for manufacturing the laminated | multilayer film or sheet | seat of this invention. The figure which shows an example of the pattern which appears on the foaming layer surface of the laminated | multilayer film or sheet | seat of this invention.

Explanation of symbols

1. 1. Cooling roll Nip roll 2. 3. Coextrusion die Base material 5. 5. Flow path of molten polymer (foaming agent) 5 ′ Manifold 6. Laminated film (sheet)
7). Air gap 8. 9. Gap between rolls Extrusion laminator a Melting web

Claims (8)

A laminated film or sheet comprising at least a base material, a thermoplastic resin foam layer and a thermoplastic resin non-foam layer ,
The thermoplastic resin foam layer is formed by foaming when a thermoplastic resin composition containing a foaming agent and a thermoplastic resin or resin composition not containing a foaming agent are co-extruded and laminated on a base material. A laminated film characterized by containing fine elongated foam cell groups and having a stripe-like streak pattern on a cloudy glassy translucent ground due to the local density of the dispersion density of the foam cell groups Or a sheet. The laminated film or sheet according to claim 1, wherein the foaming ratio of the thermoplastic resin foam layer is 1.2 to 5 times. The laminated film or sheet according to claim 1 or 2, wherein the thermoplastic resin constituting the foam layer is made of an ethylene polymer. The laminated film or sheet according to any one of claims 1 to 3, wherein the thermoplastic resin non-foamed layer is a transparent layer or a colored layer, and is laminated on one surface side of the thermoplastic resin foamed layer. . Overlapping blowing agent-containing thermoplastic resin composition as melt co-extruding a thermoplastic resin or resin composition containing no foaming agent from the co-extrusion laminator of the die, one surface of one side of the co-extruded melt web and substrate passed through a gap between the cooling roll and the nip roll in engaged state and taking over, both at the laminated film or sheet producing method comprising a step of heat-bonding laminating, the blowing agent-containing thermoplastic resin composition is die The laminated film or sheet production according to any one of claims 1 to 4, wherein the foamed layer is formed by foaming from the time when the film passes through the gap between the cooling roll and the nip roll. Method. The method for producing a laminated film or sheet according to claim 5, wherein the foamed layer is formed by adjusting an extrusion resin temperature, a processing speed, an air gap, and a gap length between a cooling roll and a nip roll of an extrusion laminator. In forming the foamed layer, the extrusion resin temperature of the extrusion laminator is adjusted in the range of 150 to 300 ° C., the extrusion laminator processing speed is adjusted in the range of 5 to 150 m / min, and the air gap is adjusted in the range of 50 to 150 mm. The manufacturing method of the laminated | multilayer film or sheet in any one of Claims 5 thru | or 6 . The method for producing a laminated film or sheet according to any one of claims 5 to 7, wherein a gap length between the cooling roll and the nip roll is adjusted to a range of 0 to 2 mm.

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