JPH07108637A - Vessel - Google Patents

Abstract

PURPOSE:To provide a vessel formed of the foaming sheet of polystyrene-based resin in which printing unevenness is not especially caused in relating to various vessels such as a tray and a bowl formed of raw fabric obtained by laminating a thermoplastic resin film on the foaming sheet of polystyrene-based resin. CONSTITUTION:A vessel is obtained by laminating a thermoplastic resin film consisting of a single layer or multilayers on at least one side of the main body of the vessel formed of expanded material of polystyrene-based resin. Silicone oil is contained in the film of the outside layer of the laminated film at 0.01-wt.%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various containers such as trays and bowls formed from a raw material obtained by laminating a thermoplastic resin film on a polystyrene resin foam sheet, and particularly to prevent uneven printing. The present invention relates to a container made of a polystyrene-based resin foam sheet.

[0002]

2. Description of the Related Art A thermoplastic laminated foam sheet obtained by laminating a thermoplastic resin film on at least one surface of a polystyrene type resin foam sheet is used as a raw material, and this is processed by a vacuum molding method or the like. It is widely known to use various bowl-shaped containers. When molding this container, when improving the mold releasability from the mold, or when filling the contents in each molded individual container, when separating a plurality of stacked containers individually It is known that silicon oil is generally applied to the film side of the original fabric to prevent blocking of the container. However, since the film itself has poor wettability to silicone oil, applying silicone oil causes
When the tray or the container is formed from the original fabric on which the coating unevenness occurs, and the printing is performed on the tray or the container, the adhesion of the printing ink varies and uniform printing cannot be performed.

Further, in order to form a bowl-shaped deep-drawing molded article, in a foam sheet raw material laminated with a thermoplastic resin film, the thermoplastic resin film is 1 to 11% of the unit area before heating. It was found that it is necessary to increase the area, but when silicone oil is applied, if there is uneven application of silicone oil on the surface of the sheet, the unevenness after heating will be affected by the unevenness and uniform elongation will occur. Can't get Also,
Since the elongation varies depending on the molding cycle, it is difficult to stably control the film area within 1 to 11%.

Therefore, an antistatic agent such as stearic acid monoglyceride is kneaded into the film, and a tray or container is formed by using a raw material obtained by laminating the film and a foam sheet, and printing is performed. However, since silicone oil was not applied, problems of releasability and blocking occurred. Then, when silicon oil was applied to this, the above-mentioned uneven application of silicon oil occurred, and thus the printability was deteriorated and uniform printing could not be performed.

[0005]

DISCLOSURE OF THE INVENTION The present inventor has found that a foam sheet
The present invention has been completed as a result of various studies to form a tray or bowl-shaped container from an original fabric in which a film is laminated on a sheet, and to perform uniform printing on the container. It has the uniform printing characteristics obtained from the original fabric of the thermoplastic laminated foam sheet consisting of the laminate of the film and the film, and has good releasability from the mold, and also when separating the stacked containers. The purpose is to provide various molded products that do not cause any problems.

[0006]

Means for Solving the Problems The subject matter of the present invention is a container in which a thermoplastic resin film having a thickness of 5 to 550 μm is laminated on at least one surface of a polystyrene resin foam container body. In the container, the outer layer film of the laminated film contains 0.01 to 3% by weight of silicon oil.

That is, in the present invention, by kneading silicone oil into the raw thermoplastic resin film, the releasability at the time of molding is improved, the blocking of the obtained container is prevented, and the problem of coating unevenness is caused. Therefore, it is possible to provide a container which has no blocking property and has uniform printing characteristics. When molding a bowl-shaped deep-drawn product, the original thermoplastic laminated foam sheet is 1 in the unit state before heating of the laminated foam sheet in a state immediately before molding in the molding machine. Since it has a property of increasing by 11%, the thermoplastic resin film laminated in consideration of this point is 1-11% with respect to the unit area before heating.
By increasing the number, a good bowl-shaped container can be provided.

Further, the present invention will be described in detail. As the polystyrene resin in the present invention, styrene, methylstyrene, ethylstyrene, isopropylstyrene, dimethylstyrene, paramethylstyrene, chlorostyrene, bromostyrene, vinyltoluene, a homopolymer or copolymer of vinylxylene, for example, as a resin Styrene-maleic anhydride copolymer, styrene / acrylic acid copolymer, high-impact polystyrene, styrene / acrylonitrile resin, acrylonitrile / butadiene-styrene resin can be used. Polystyrene resin is particularly preferable.
A foaming agent is added to this polystyrene resin to form a raw foam sheet layer.

The blowing agent used is hydrocarbon, propane, i-butane, n-butane, i-pentane, n-pentane, or a mixture thereof, and N ₂ , C.
_{O 2, N 2 / CO 2} , water, water with -OH, -COOH, -C
_{N, -NH 3, -OSO 3 H} , -NH, CO, NH 2, -
_{CONH 2, -COOR, -CHSO 3 H} , -SO 3 H,
It is a mixture with a group having -COON ₄ and -COONH ₄ . Further, as an organic foaming agent, azodicarboxylic acid amide, dinitropentamethylenetetramine, 4, 4 '
A foaming agent such as oxybis (benzenesulfonyl hydrazide) can be used. Further, a combination of an organic acid such as sodium bicarbonate or citric acid or a salt thereof with a bicarbonate can be used. Alternatively, for example, a combination of an organic acid such as sodium bicarbonate citric acid or a salt thereof and bicarbonate can be used, and these can also be used by coating with a low molecular weight olefin, rose, tallow oil or the like. Others are mixtures of these. Inorganic carbon dioxide products in this invention include carbonates or bicarbonates of alkali metals or alkaline earth metals,
Mention may be made of ammonium carbonate and ammonium bicarbonate. Of these, sodium bicarbonate is preferably used.
Further, these may be a mixture of two or more kinds. All of these are available as powders. As a weak acid to be mixed with this, oxalic acid, malonic acid, maleic acid, fumaric acid, succinic acid, itaconic acid, citraconic acid, adipic acid, formic acid, acetic acid, furupionic acid, butyric acid, stearic acid,
Oleic acid, caprylic acid, enatonic acid, caproic acid, valeric acid, lactic acid, tartaric acid, citric acid, phthalic acid, benzoic acid,
Examples thereof include organic acids such as benzenesulfonic acid, toluenesulfonic acid, chloroacetic acid and diglycolic acid, inorganic acids such as boric acid and acidic salts such as potassium acid tartrate, and citric acid is preferably used. These may be a mixture of two or more.

The expansion ratio is 1.5 to 2
It is about 0 times. In forming the expanded polystyrene resin sheet layer, a compounding agent which is usually used in the resin, for example, a cell regulator or a pigment may be added. The original thickness of the expanded polystyrene resin sheet layer in the present invention is not particularly limited, but it is usually required to have the thickness of the expanded polystyrene sheet constituting this type of tray. The foaming means is not particularly limited, but extrusion foaming is most preferable.

As the thermoplastic film laminated on the foamed sheet, the above-mentioned polystyrene-based synthetic resin can be used. In addition, a mixture of polystyrene-based resin and impact-resistant polystyrene or impact-resistant polystyrene alone can be used. In addition, the styrene-butadiene copolymer is dispersed in the impact-resistant polystyrene in a salami structure, and the particle size is 0.3 μm.
It is possible to cite those containing a large amount of those having a size of m to 10 μm. In addition, linear low density polyethylene, high density polyethylene, low density polyethylene, propylene homopolymer, ethylene / propylene random polymer, ethylene / propylene block polymer, ethylene / propylene / butene / terpolymer, ethylene / Vinyl acetate copolymer, ethylene-unsaturated carboxylic acid ester copolymer (for example, ethylene-methyl methacrylate copolymer), ethylene-unsaturated carboxylic acid metal salt copolymer (for example, ethylene-magnesium acrylate) (Or zinc)
Copolymer), propylene-vinyl chloride copolymer, propylene-butene copolymer, propylene-maleic anhydride copolymer, propylene-olefin copolymer (propylene-ethylene copolymer, propylene-butene-1 copolymer) polyethylene or Unsaturated carboxylic acid (eg, maleic anhydride) modified product of polypropylene, ethylene-
Propylene rubber, atactic polypropylene and the like, polyethylene, ethylene-propylene copolymer,
Examples thereof include a propylene-butene-1 copolymer, a mixture of two or more of these, and a film of polyethylene terephthalate, polybutylene terephthalate, or the like.

Silicone oil is kneaded into the thermoplastic film at a rate of 0.01 to 3% by weight. If the silicone oil content is 0.01% by weight or less, the effect of improving the releasability at the time of molding and the prevention of blocking cannot be expected, and the slippage between the container and the blanket of the printing machine becomes poor, and the printability also deteriorates. If it is 3% by weight or more, the extrusion stability during film production is poor and the appearance of the film is poor. And
When kneading silicone oil into a thermoplastic film, up to 0.2% by weight can be kneaded into the resin in a blend,
If the amount exceeds 3% by weight and the resin slips and does not bite into the screw stably, it is kneaded into the resin with a mixing roll such as a calendar roll to form pellets, or after polymerization or polymerization. It is carried out by a so-called injection method in which it is added in the middle of the pelletizing step or is press-fitted in the middle of the extruder.

Silicon oil is added in an amount of 0.01% by weight to 0.
After kneading into 2% by weight resin and, if further effect is required, after kneading into 0.01% by weight to 0.2% by weight resin, apply even silicone oil on the film without uneven application. Therefore, when the resin is kneaded with 0.01 wt% to 0.2 wt% resin and further coated with silicone oil, printing unevenness does not occur. There was no problem even if an antistatic material such as monoglyceride stearate was kneaded together with the silicone oil. Further, silicone oil may be mixed with the foamed sheet to improve bubbles, moldability and the like. Also, printing is done on a film containing silicon,
Thereafter, the printed surface or the unprinted surface may be directly heat-laminated with the foamed sheet, or the film may be coated with a binder and then heat-laminated, or extrusion-laminated using an extruder. The silicone oil used in the present invention is 1 at 25 ° C.
Those having a kinematic viscosity of 00 to 100,000 centistokes are preferable. If it is less than 100 centistokes, the effect is small unless a large amount is mixed. Further, when the mixing amount is increased, the extrusion stability is deteriorated and the appearance of the film is deteriorated. On the other hand, if it exceeds 150,000 centistokes, it becomes difficult to mix it with the resin due to its high viscosity. As the silicone oil, either an oil type, a compound type or a silicon powder can be used, but the oil type is easier to use. An emulsion type or the like can be used for coating.

In the present invention, when a bowl-shaped container which is a deep-drawing molded product is molded, the film side of the original laminated foam sheet has a property of increasing by 1 to 11% with respect to the unit area before heating. This condition is calculated by the following formula.

[0015]

[Equation 1]

Area before heating = Area having a quadrangle with a side of 550 mm square or 900 mm square on the film side before setting in the molding machine. Area after heating = Set the quadrilateral part at approximately the center in the heating zone of the molding machine, take out without heating after heating under the temperature conditions for molding, and use 5 equally divided yarns for both MD and TD. An area calculated by measuring their lengths, calculating the respective average values of MD and TD, and multiplying them. The method for measuring bubbles in the present invention is ASTM-28.
42-69. That is, air bubbles in the flow direction (MD) and the width direction (TD) of the foamed sheet are taken 20 times, and a length L of 1/3 of the total thickness and a total of 2/3 is measured from the center of the thickness. The average chord length (t) was measured from the number of bubbles in the meantime, and the average diameter (d) of the bubbles was calculated by the following formula. MD and TD directions were also calculated for the same length. t = L / number of bubbles d = t / 0.616 The molding was performed by Asano Laboratory (FLP-2-W-H).

If this value is 1% or less, for example, in a deep-drawing container which is a bowl-shaped container for food, it may not be able to be molded due to partial insufficient elongation, while if it exceeds 11%, it may be molded. When heated in the machine, the laminated foam sheet drastically sags, causing a partial difference in the distance from the heater and uneven heating. To unravel, coat the film on a polystyrene foam sheet (melt HI and roll to coat).
In this method, the foamed sheet can be stretched and the film is not stretched, resulting in a large sag. Therefore, it is necessary to increase the stretching of the original fabric. As means for controlling the increase rate of the area of such a laminated foam sheet, the extrusion direction (MD): the width direction (TD): the thickness direction (V
D) = 0.74: 1.42: 0.93 to 1.54: 0.
The shape of the bubbles is adjusted to be in the range of 90: 0.72. Adjustment of this bubble is done by the blow-up ratio, slit gap,
It is carried out by changing the extrusion foaming conditions such as cooling (die outlet) and the blending of raw materials. The blow-up ratio is about 2.5 to 4.2 and the slit gap is 0.1, though it depends on the specifications of the laminated foam sheet such as the type and density of the foam sheet.
5 to 1.9 mm, cooling air is 0.04 to 0.4 m ³ /
It is obtained by controlling in the range of m ² .
In the present invention, for example, when used as a food container, polyolefin is added to a foam sheet obtained by pasting a different resin such as a gas barrier film to the foam sheet in order to prolong the shelf life of the contents. It is also possible to stack the system films and mold them into a container and separate them after use. Examples of the gas barrier film to be laminated on the foam sheet include ethylene / vinyl acetate copolymer, polyvinyl alcohol, polyvinylidene chloride, polyamide, polyester, polyacrylonitrile, vinylidene chloride / acrylonitrile copolymer, and acrylonitrile. Methyl methacrylate / butadiene copolymer, nylon 6, biaxially oriented nylon, biaxially oriented polyethylene terephthalate,
Biaxially oriented polypropylene, high density polyethylene, ionomer resin (for example, registered trademark Sarin), or a metal vapor deposition film alone or a laminate of these films is used. In the present invention, the foam sheet
In the case of stacking a gas barrier film with a
In addition to extrusion, there is a method of performing heat lamination, in which the film is heated and pressure-bonded from the side opposite to the joint surface with a heat roll. In this case, the surface of the roll that is heated and pressure-bonded is plated with chrome or Teflon to prevent stickiness with the heated film. In the present invention, it is preferable that the joint surface is heated by a heating device together with the thermocompression bonding by a heat roll.

Further, a foam sheet of a resin different from the foam sheet
It can also be applied to a laminated foam with a sheet. For example, expanded polystyrene sheet (PSP) and polyethylene (PE)
For example, a foam sheet is attached to form a full tray, and after use, the foamed PE and PSP on the inside are peeled off and collected. If the film is sufficiently barriered, recycled raw materials (used recovered products), for example, recovered raw materials such as trays and bowl containers can be used for food containers. The film may be multi-layered and may be used by laminating EVAL or the like between olefins. Next, the present invention will be specifically described with reference to examples.

Example 1 Polystyrene resin having MI of 2.1 (HRM-manufactured by DENKA)
2) After adding 0.3 parts by weight of talc fine powder and 0.2 parts by weight of hydrochlore as a nucleating agent to 100 parts by weight, the resulting mixture was put into an extruder having an inner diameter of 90 mm, heated and melted at 150 to 230 ° C., Isobutane (4%) was injected as a foaming agent, and the foaming temperature was adjusted to an appropriate temperature and the composition was extruded from a mold. The mold has a diameter of 105 mm, a slit of 0.8 mm, a blow-up ratio of 3.2, air-
Amount of 0.12m ³ / m ² (25 ° C), extrusion rate of 67kg / h
Met. Extruded polystyrene foam has a basis weight of 234
It was g / m ² and the density was 0.095 g / cc. This expanded polystyrene sheet was mixed with high-impact polystyrene resin having an MI of 3.2 and 0.05% of silicone oil having a viscosity of 350 centimeters of dimethylpolysiloxane, and was extruded with a diameter of 65 mm into a cylinder of 150 to 350 ° C. -Extruded at a rate of 105 kg per hour at temperature, laminating a 190 μm film. Laminated foam sheet has a basis weight of 433.5 g /
m, thickness 2.55 mm, bubble shape ratio MD: TD: V
It was D = 0.99: 1.25: 0.81. The film peeling strength of this laminated foam sheet could not be measured due to material destruction. This laminated sheet was taken in 36 bowls in a bowl and the heater temperature of the molding machine was 220.degree.
It was molded at 350 ° C. for 5.2 sec / cycle. The area increase rate was 3.5%. The molded bowl-shaped container was printed with a curved surface printing machine (type KK5 / 5-861 / DIR.R manufactured by Hubei Seiko) at a rate of 150 / min using KKUV ink flash dry CURE manufactured by Toyo Ink Co., Ltd. There was no problem in printability. In addition, when 50 sheets were superposed and rotated, it went around smoothly and there was no problem in blocking. Further, when the film was molded with the film inside and the lid was heat-sealed and peeled off, the film did not peel off. Also, after washing this molded product, IC
When Si was quantified by P (high-frequency plasma spectroscopic analyzer) to calculate silicon, it was 0.05%. The above conditions and results are shown in Table 1.

Example 2 100 parts by weight of a polystyrene resin having an MI of 2.8, 0.4 parts by weight of talc fine powder as a nucleating agent, and 0.
After adding and blending 2 parts by weight, the resulting mixture was put into an extruder having an inner diameter of 90 mm, heated and melted at 150 to 225 ° C., and isobutane 70 and normal butane 30 were used as a foaming agent at a ratio of 3.
8% was injected, and 0.2% of carbon dioxide was added. Then, the foaming temperature was adjusted to an appropriate temperature and the mixture was flown into the merging die. On the other hand, EVA (MI = 0.5, VAC: 8) as a binder from a 45 mm extruder
%) Was melted by heating and flowed into a confluent die. Then, from another 45 mm extruder, polyethylene resin (MI =
0.3) was melted by heating and flowed into a joining die. Also, 4
High impact polystyrene resin (M
I = 5) was mixed with 0.01% of dimethylsiloxane 480 centistokes of silicone oil, and
The resin was heated and melted at a cylinder temperature of 0 ° C., the resin was flown into a mold die, and the respective resins were joined and then extruded from the mold. The mold has a diameter of 110 mm and a slit of 0.95 mm
With a blow-up ratio of 3.0, an air volume of 0.10 m ³ / m ²
(25 ° C). The extruded laminated foam sheet has a basis weight of 422 g / m, PSP / EVA / PE / EVA / HI.
Was about 381/11/9/15/6. The foam shape ratio of the laminated foam sheet is MD: TD: VD = 0.9.
It was 8: 1.27: 0.80. The peel strength of the original fabric is 1
The width was 10 g / 25 mm. The extrusion rate Q per unit time was 82 kg / h. This laminated sheet is used as a bowl container 3
Molding was carried out at a molding machine heater temperature of 215 ° C. to 355 ° C. at a molding cycle of 5.3 sec / cycle without applying silicon in six pieces. The area increase rate was 1% in the MD direction. There was no problem in moldability. Printing was performed in the same manner as in Example 1, and 1 out of 100 containers had a printability limit in the container on the side of the molding machine. The printability is limited to 1
When 5 out of 00 prints occur, it is determined that a print defect occurs due to variations. There was no problem with blocking. Further, when the film was molded with the film inside and the lid was heat-sealed and peeled off, there was no simultaneous peeling of the film. The above results are shown in Table 1. The peel strength between the expanded polystyrene sheet resin layer and the polyolefin film was 5 g /
The range is 25 mm width to 400 g / 25 mm width. If it is less than 5 g / 25 mm, it peels off during use as a container, while if it exceeds 400 g / 25 mm, it is difficult to peel it off, and if it is forcibly peeled off, the film may break. However, when the lid is an aging peel, a peel strength of 200 g / 25 mm or more is required. When a barrier film or the like is laminated on the foamed sheet for molding, the barrier film comes inside, so the lid is sealed on the film. In this case, peel strength is about 100g / 25mm
If the width is less than the width, the film is peeled off when the lid is peeled off because the container is used, which is a problem. In such cases,
If you make an uneven line at the position where the lid of the mold is to be sealed, or if you roll-process, pear-process or make a groove along the rib of the container, it will be pressed by the mold press at the time of molding. The peeling strength is increased by 20 to 200% only in the broken portion, and the problem can be solved. For example, when molding a bowl container or the like, the rib portion is strongly pressed to satisfy the function of the container, and unnecessary parts after punching the container can separate the film and foamed sheet of different materials and recycle the recovered resin. Available. The same effect becomes more remarkable when the binder is foamed or when the filler is mixed with the binder. Further, when silicone is mixed in the foamed sheet and the film to be bonded to the foamed sheet, the peeling strength changes, so care must be taken. On the contrary, the peel strength can be controlled by the amount of silicon mixed. The peel strength was measured by Orie
It is a measured value when a 200 mm / min speed 180 degree peeling was performed using ntec Corporation RTM-500.

Example 3 A foamed sheet was extruded in the same manner as in Example 1 and a high-impact resin obtained by mixing 0.2 part of silicon oil by an injection method was laminated on the foamed sheet. The cell shape ratio of the obtained laminated foam sheet was MD: TD: VD = 1.01: 1.
It was 25: 0.79. When this was molded under the conditions shown in Table 1, the area increase rate was 10.5%. After washing this molded product, silicon was quantified by ICP (high frequency plasma spectroscopic analyzer) to calculate silicon to be 0.18%.
Became.

Example 4 A DILARK 232 resin having an MI of 2.0 was compounded at the ratio shown in Table 1. The mixed hydroceles were HK-70 type. The mold has a diameter of 95 mm and a slit of 0.9
The blow-up ratio was 3.5 at 5 mm. The film used was a mixture of HIPS (MI = 1.8) and PS (MI = 1.8) in a ratio of 1: 1. At the time of heat lamination of the foam sheet and the film, it is difficult to bond just by heat roll,
An electric heat heater was used. Further, although silicon was sprayed before molding, there was no problem in printability. The foam shape ratio of the laminated foam sheet is MD: TD: VD = 0.97: 1.40: 0.7.
It was 4. When molded under the molding conditions shown in Table 1,
The area increase rate for both MD and TD was 2.1%.

Example 5 Foaming sheet and film co-using GE Plastics Noryl (comprising 34% PPO) was extruded and laminated at the compounding ratio and operating conditions shown in Table 2.
(Hydrocellulose is HK-70 type) Laminated foam sheet
The bubble shape ratio of g is MD: TD: VD = 1.05: 1.2
It was 1: 0.85. When this was molded under the molding conditions shown in Table 2, the area increase rate was 1.1% in the TD direction.

Example 6 A laminated foam sheet was obtained in the same manner as in Example 5 except that 0.05% of 100 centistoxus silicone oil was mixed with the foam sheet material. The film peeling of the laminated foam sheet had a width of 260 g / 25 mm. The foam shape ratio of the laminated foam sheet is MD: TD: VD = 1.07: 1.1.
It was 9: 0.78. When this was molded under the molding conditions shown in Table 2, the area increase rate was 1.4% in the TD direction.

Example 7 In the same manner as in Example 1, the mold had a diameter of 125 mm, a slit of 0.9 mm, a blow-up ratio of 2.66, and an air amount of 0.17 m ³ / m ² and was mixed with the film. A silicone oil having a viscosity of 130,000 cm stock was used. Blend time was extended from 7 minutes to 12 minutes with silicone oil. It had a high viscosity, and it was difficult to blend to some extent. The foam shape ratio of the laminated foam sheet is MD: TD: VD = 1.35:
It was 0.99: 0.75.

Example 8 Using the formulation shown in Table 2 and using the same settings as in Example 1, the blowing agent (n
-Butane / i-butane = 35/65) was injected at 3.3% to obtain an expanded polystyrene sheet having 338 g / m ² and a density of 0.129 g / cc. The film is HI (MI =
1.8) and PS (MI = 1.8) are mixed at a ratio of 1: 1 and silicon is dimethylpolysiloxane (10,000 C.I.
S. ) Was kneaded in 1.5%. This film was printed and heat-fused with the above expanded polystyrene sheet (the side to which the film was attached was treated at 190 ° C.) using a heat roll. This laminated foam sheet has a thickness of 2.66 mm and a basis weight of 3.
The bubble shape ratio is MD: TD: VD = 1.0 at 80 g / m ^2.
It is 1: 1.23: 0.80 and the peel strength is 380 g /
It was 25 mm. With this laminated foam sheet, the temperature of the molding machine heater was adjusted to 22 without removing silicone coating by removing 36 bowls.
Molding was performed at 0 ° C to 350 ° C in a 5.0 second cycle. The molding was good and there was no blocking and there was no problem. When the film of the molded product was peeled off, it was 352 g / 25 mm. Silicon can be quantified by peeling off the molded product or laminated foam sheet film and washing, and then quantifying with a high performance liquid chromatograph using eluent, tetrahydrofuran (THF), or ICP.
It is advisable to quantify and calculate Si with a (high-frequency plasma emission analyzer).

Comparative Example 1 A laminated foam sheet was obtained by the compounding and coextrusion shown in Table 3. The film was thinned to about 4 μm by coextrusion and extruded, and laminated with a foam sheet. Laminated foam sheets were not found at the time of extrusion, but post-molding film perforations were found. Also, when the VAC content of the binder was reduced to 6%, the film peeling was 85 g / 25
When the container had a width of mm and the lid was heat-sealed and peeled off, film peeling occurred. The foam shape ratio of the laminated foam sheet was MD: TD: VD = 0.99: 1.28: 0.79.

Comparative Example 2 Binder and polyethylene of 45 m were prepared by the method of Example 2.
Stop the extruder and increase the film ratio to 140μ
m and the amount of air was 0.23 m ³ / m ² , the area increase rate during molding was 0.5% and the bubble shape was MD: TD: VD =
It becomes 1.15: 1.44: 0.6 and is 1 on the side of the molding machine.
Poor elongation occurred in some containers. In addition, when only containers with good molding were collected and printed, there was a problem in printability at a ratio of 16/100. There was also a problem in the blocking test. Next, when the amount of air was set to 0.18 m ³ / m ² , the area increase rate at the time of molding was 1.5%, and the elongation failure at the time of molding disappeared, but the problem of printability occurred 8/100. There was also a problem with blocking. MD: TD: VD = 1.02:
It was 1.35: 0.73.

Comparative Example 3 When the film thickness was set to 570 μm in Example 3, the area increase rate during molding was 13% and heating unevenness occurred on the PSP side. The foam shape ratio of the laminated foam sheet is MD: TD: VD =
It was 1.01: 1.24: 0.80.

Comparative Example 4 In the same manner as in Example 1, 3.2 parts of silicone oil was added to the film by the injection method, but the appearance of the film deteriorated and the printability was poor. The foam shape ratio of the laminated foam sheet is MD:
It was TD: VD = 0.99: 1.23: 0.82.
The above results are summarized in Tables 1, 2 and 3. The melt viscosity (MI) of the resin was measured by the following method depending on the type of resin. Polystyrene (PS): JIS-K 6870 Polyethylene (PE): JIS-K 6760 Ethylene-vinyl acetate copolymer (EVA): JIS-K
6730 Styrene-maleic anhydride copolymer (Dylac): A
STM-D-1238

[0031]

[Table 1]

[0032]

[Table 2]

[0033]

[Table 3]

[0034]

As described above, according to the present invention, in the thermoplastic laminated foam sheet, the film side of the laminated foam sheet has an area increased by 1 to 11% with respect to the original unit area. By this, a bowl-shaped container, which is a deep-drawing molded product, can be molded without any hindrance, and even if the thermoplastic film contains 0.01 to 3% by weight of silicone oil, it is printed uniformly without causing uneven printing. In addition, it was possible to obtain effects such as no blocking.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B32B 27/18 Z 8413-4F 27/30 B 8115-4F B65D 1/09

Claims (5)

[Claims] 1. A container in which a thermoplastic resin film having a thickness of 5 to 550 μm and composed of a single layer or multiple layers is laminated on at least one surface of a polystyrene resin foam container body, and an outer layer of the laminated film. 0.01 film
A container containing ~ 3% by weight of silicone oil. 2. The container according to claim 1, wherein at least one surface of the film containing silicone oil is printed. 3. The container according to claim 1, wherein at least one layer of the single-layer or multi-layer thermoplastic resin film is made of a gas barrier resin. 4. The container according to claim 1, 2 or 3, wherein the silicone oil has a kinematic viscosity at 25 ° C. of 100,000 to 150,000 centistokes. 5. The peel strength between the polystyrene resin foam container body and the thermoplastic resin film is at least 100 g.
/ 25 mm. The container according to claim 1, 2, 3, and 4.