JP3020078B2 - Container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tray or bowl-shaped container formed from a raw material obtained by laminating a thermoplastic resin film on a polystyrene resin foam sheet, and more particularly to a method for preventing uneven printing. The present invention relates to a container made of a polystyrene resin foam sheet.

[0002]

2. Description of the Related Art A thermoplastic laminated foamed sheet in which a thermoplastic resin film is laminated on at least one surface of a polystyrene-based resin foamed sheet is used as a raw material, and this is formed into a tray or a sheet by means such as vacuum forming. It is widely known that various bowl-shaped containers are used. And, when molding this container, it is necessary to improve the releasability from the mold, or to separate a plurality of stacked containers individually when filling the contents in each formed container. It is known that silicone oil is generally applied to the film side of the raw material in order to prevent blocking of the container. However, when applying silicone oil because the film itself has poor wetting with silicone oil,
Uneven coating is likely to occur, and when a tray or a container is formed from the raw material on which uneven coating has occurred, and printing is performed on this, there has been a problem that the adhesion of the printing ink varies and uniform printing cannot be performed.

In order to form a bowl-shaped deep drawn product, a thermoplastic resin film is laminated on a raw sheet of a foamed sheet at a rate of 1 to 11% with respect to a unit area before heating. It was found that it was necessary to increase the area to a certain extent. However, when silicone oil was applied, if the silicone oil was unevenly applied to the sheet surface, the elongation after heating was affected by the unevenness, resulting in uniform elongation. Can not be obtained. Also,
Since the elongation for each molding cycle also varies, it has been difficult to stably control the film area within 1 to 11%.

[0004] Therefore, an antistatic agent such as monoglyceride stearate is kneaded into the film, and a tray or container is formed and printed by using a raw material obtained by laminating the film and a foamed sheet. Although the releasability was improved, problems of releasability and blocking occurred because no silicone oil was applied. Then, when silicon oil was applied thereto, the application unevenness of the silicon oil described above occurred, so that printability was deteriorated and uniform printing could not be performed.

[0005]

SUMMARY OF THE INVENTION The inventor of the present invention has proposed a foam sheet.
The present invention was completed as a result of forming a tray or bowl-shaped container from a raw material obtained by laminating a film on a sheet and performing uniform printing on the container. It has uniform printing characteristics obtained from the raw material of a thermoplastic laminated foamed sheet consisting of a laminate of a sheet and a film, has good mold release properties from a mold, and is used when separating stacked containers. An object of the present invention is to provide various molded products without any trouble.

[0006]

The gist of the present invention is to provide a container in which a single-layer or multi-layer thermoplastic resin film having a thickness of 5 to 550 μm is laminated on at least one surface of a polystyrene resin foam container main body. In this case, the outer layer film of the laminated film contains 0.01 to 3% by weight of silicone oil, and is made of polystyrene resin foam.
The peel strength between the container body and the thermoplastic resin film is low.
Is also 100 g / 25 mm .

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

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, homopolymer or copolymer of vinylxylene, for example, as the resin Styrene-maleic anhydride copolymer, styrene-acrylic acid copolymer, impact-resistant polystyrene, styrene-acrylonitrile resin, acrylonitrile-butadiene-styrene resin can be used. Particularly, a polystyrene resin is preferable.
A foaming agent is added to the polystyrene resin to form a foamed sheet layer of the raw material.

The blowing agents used include hydrocarbons, propane, i-butane, n-butane, i-pentane, n-pentane, or mixtures thereof, and N ₂ , C ₂
O ₂ , N ₂ / CO ₂ , water, water and —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 compound having a group of -COON ₄ or -COONH ₄ . Also, azodicarboxylic acid amide, dinitropentamethylenetetramine, 4, 4 ′ as an organic foaming agent.
Blowing agents such as oxybis (benzenesulfonyl hydrazide) can be mentioned. Further, a combination of an organic acid such as sodium bicarbonate or citric acid or a salt thereof with a bicarbonate, or the like can also be used. Alternatively, for example, a combination of an organic acid such as sodium bicarbonate citric acid or a salt thereof with a bicarbonate, or the like can be used, but these can also be used by coating with a low molecular weight olefin, flowing rose, tallow oil or the like. Others are mixtures thereof. As the inorganic carbon dioxide product in the present invention, in addition to carbonates or bicarbonates of alkali metals or alkali metals,
Ammonium carbonate and ammonium bicarbonate. Among them, it is preferable to use sodium bicarbonate.
These may be a mixture of two or more. These are all available as powders. Weak acids mixed with this include oxalic acid, malonic acid, maleic acid, fumaric acid, succinic acid, itaconic acid, citraconic acid, adipic acid, formic acid, acetic acid, flopionic acid, butyric acid, stearic acid,
Oleic, caprylic, enantonic, caproic, valeric, lactic, tartaric, citric, phthalic, benzoic,
Organic acids such as benzenesulfonic acid, toluenesulfonic acid, chloroacetic acid, and diglycolic acid; inorganic acids such as boric acid; and acid 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 generally used, for example, a cell regulator, a pigment or the like may be added to the resin. The original thickness of the foamed polystyrene resin sheet layer in the present invention is not particularly limited, but it is usually sufficient to have the thickness of the foamed polystyrene sheet constituting this kind of tray. The foaming means is not particularly limited, but extrusion foaming is most preferable.

As the thermoplastic film to be laminated on the foamed sheet, the above-mentioned polystyrene-based synthetic resin can be used. In addition, a mixture of a polystyrene-based resin and impact-resistant polystyrene or a single-piece of impact-resistant polystyrene can be used. In addition, a styrene-butadiene copolymer is dispersed in a high-impact polystyrene in a salami structure, and the particle size is 0.3 μm.
and those containing a large number of m to 10 m. 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 Modified unsaturated carboxylic acid (for example, maleic anhydride) 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 films such as polyethylene terephthalate and polybutylene terephthalate.

The thermoplastic film is kneaded with silicone oil at a rate of 0.01 to 3% by weight. If the amount of the silicone oil is 0.01% by weight or less, effects such as improvement of releasability at the time of molding and prevention of blocking cannot be expected, and slip between the container and a blanket of a printing machine becomes poor, and printability also deteriorates. If the content is 3% by weight or more, extrusion stability during film production is poor, and the appearance of the film is poor. And
When kneading silicone oil into a thermoplastic film, it is possible to knead the resin with a blend up to 0.2% by weight.
If the amount exceeds 3% by weight, the resin slips and does not bite into the screw stably. Therefore, the resin is kneaded with a mixing roll such as a calendar roll to form a pellet, or after polymerization or polymerization. In the so-called injection method, for example, the compound is added in the middle of a pelletizing process, or is press-fitted in the middle of an extruder.

The silicone oil is used in an amount of 0.01% by weight to 0.1% by weight.
Knead in 2% by weight resin, and if more effect is required, knead in 0.01% to 0.2% by weight resin, then apply silicone oil on the film without unevenness Therefore, when the resin is kneaded with 0.01% by weight to 0.2% by weight and further coated with silicone oil, no printing unevenness occurs. It should be noted that there was no problem even if an antistatic material such as stearic acid monoglyceride was further kneaded together with the silicone oil. Further, silicone oil may be mixed with the foamed sheet, and the foam, the moldability, and the like can be improved. In addition, we perform printing on film which kneaded silicon,
Thereafter, the printed surface or the unprinted surface may be directly heat-laminated with the foamed sheet, or a film may be coated with a binder and then heat-laminated, or extruded using an extruder. The silicone oil used in the present invention is 1 at 25 ° C.
Those having a kinematic viscosity of from 100 to 100,000 centistokes are preferred. In the case of less than 100 centistokes, the effect is small unless a large amount is mixed. In addition, when the mixing amount is increased, extrusion stability is lacking, and the appearance of the film is deteriorated. On the other hand, if it exceeds 150,000 centistokes, mixing with the resin becomes difficult due to high viscosity. As the silicone oil, any of an oil type, a compound type and a silicon powder can be used, but the oil type is easier to use. For application, an emulsion type or the like can be used.

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

[0015]

(Equation 1)

Area before heating = Before setting in a molding machine, mark a quadrilateral having a side of 550 mm square or 900 mm square on the film side, and the area of the quadrilateral. Area after heating = The above quadrilateral portion was set almost in the center of the heating zone of the molding machine, heated under the temperature conditions for molding, taken out without molding, and used for both MD and TD with 5 equally divided yarns. The length was measured, the average value of each of MD and TD was calculated, and the area calculated by multiplication was obtained. The method for measuring bubbles in the present invention is ASTM-28.
42-69. That is, the bubbles in the flow direction (MD) and the width direction (TD) of the foamed sheet are photographed in a magnification of 20 times, and the length L is measured from the center of the thickness by 1/3 of the total thickness, that is, 2/3 in total. The average chord length (t) was measured from the number of bubbles during that time, and the average diameter (d) of the bubbles was calculated by the following equation. MD and TD directions were calculated at the same length. t = L / bubble number d = t / 0.616 The molding was performed by Asano Laboratories (FLP-2-WH).

When this value is 1% or less, for example, in a deep-drawing container, which is a bowl-shaped container for food, the part is insufficiently stretched and cracks occur, and molding cannot be performed. When heated in the machine, the sagging of the laminated foamed sheet becomes large, causing a partial difference in distance from the heater and causing uneven heating. Coat the film on a polystyrene foam sheet to melt (melt HI and coat with rolls)
In this method, since the foamed sheet can be stretched and the film is not stretched, the sag becomes large. Therefore, it is necessary to increase the stretching of the raw material. As means for controlling the rate of increase in the area of the laminated foamed sheet, the extrusion direction (MD): width direction (TD): thickness direction (V
D) = 0.74: 1.42: 0.93 to 1.54: 0.
The shape of the bubble is adjusted so as to be in the range of 90: 0.72. The adjustment of this bubble is based on the blow-up ratio, slit gap,
It is carried out by changing extrusion foaming conditions such as cooling (mold exit) and blending of raw materials. The blow-up ratio is about 2.5 to 4.2 and the slit gap is 0.1, although it differs depending on the specifications of the foam sheet, such as the type and density of the foam sheet.
5 to 1.9 mm, cooling air: 0.04 to 0.4 m ³ /
in the range of m ² control - obtained by Le.
In the present invention, for example, when used as a food container, in order to prolong the shelf life of the contents, a polyolefin is added to a foam sheet in which a foreign resin such as a gas barrier film is previously bonded to a foam sheet. It is also possible to laminate the base films, form them into containers, 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, acrylonitrile-based Methyl methacrylate-butadiene copolymer, nylon 6, biaxially oriented nylon, biaxially oriented polyethylene terephthalate,
Biaxially stretched polypropylene, high-density polyethylene, ionomer resin (for example, Surin®), or a metal-deposited film alone or a laminate of these films is used. In the present invention, the foam sheet
When laminating the gas barrier film with
In addition to extrusion, there is a method of performing heat lamination, in which a film is heated and pressed from the side opposite to the bonding surface by a heat roll. In this case, the surface of the roll to be heated and pressed is subjected to chromium plating or Teflon coating 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 the heat roll.

Further, a foam sheet made of a resin different from the foam sheet is used.
The present invention can also be applied to a laminated foam with the same. 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 inner side are separated and collected. If the film barrier is sufficiently performed, recycled materials (used recovered products), for example, recovered materials such as trays and bowl containers can be used for food containers. The film may be multilayered, and may be used by laminating eval or the like between olefins. Next, the present invention will be described specifically with reference to examples.

Example 1 A polystyrene resin having an MI of 2.1 (HRM-
2) After adding 0.3 parts by weight of talc fine powder and 0.2 parts by weight of hydrocellol as a nucleating agent to 100 parts by weight, put them into an extruder having an inner diameter of 90 mm, and heat and melt at 150 to 230 ° C. 4% of isobutane was injected as a foaming agent, and the mixture was extruded from a mold at an appropriate foaming temperature. The mold has a diameter of 105 mm, a slit of 0.8 mm, a blow-up ratio of 3.2, and air.
0.12m ³ / m ² (25 ° C), extrusion rate 67kg / h
Met. The extruded polystyrene foam has a basis weight of 234
g / m ² and the density was 0.095 g / cc. To this expanded polystyrene sheet, 0.05% of silicone oil having a viscosity of 350 centistokes was mixed with a high impact polystyrene resin having an MI of 3.2, and a cylinder of 150 to 350 ° C. was extruded with an extruder having a diameter of 65 mm. Extrusion at 105 kg / h at a temperature and extrusion and lamination of a 190 μm film. The laminated foam sheet has a basis weight of 433.5 g /
m, thickness 2.55mm, bubble shape ratio is MD: TD: V
D = 0.99: 1.25: 0.81. The film peel strength of this laminated foamed sheet could not be measured due to material destruction. This laminated sheet is made of 36 bowl bowls without silicon coating, and the molding machine heater temperature is 220 ° C.
Molding was performed at 350 ° C. at 5.2 sec / cycle. The area increase rate was 3.5%. The formed bowl-shaped container was printed at 150 pcs / min with a curved surface printing machine (KK5 / 5-861 / DIR.R type manufactured by Hubei Seiko) using KKUV ink flash dry CURE manufactured by Toyo Ink Co., Ltd. for 100 pcs. There was no problem in printability. Further, when 50 sheets were stacked and rotated, the film turned smoothly, and there was no problem in blocking. The film was molded with the film inside, the lid was heat-sealed, and the film was not peeled when peeled off. After cleaning this molded product, IC
When P (high frequency plasma spectroscopy) was used to quantify Si and calculate silicon, the result was 0.05%. Table 1 shows the above conditions and results.

Example 2 0.4 parts by weight of fine talc powder as a nucleating agent, 100 parts by weight of a polystyrene resin having an MI of 2.8, and 0.1 part of hydrocellol.
After adding and blending 2 parts by weight, the mixture was put into an extruder having an inner diameter of 90 mm, and heated and melted at 150 to 225 ° C, followed by isobutane 70 and normal butane 30 as a foaming agent in a ratio of 3.
8% was injected, and 0.2% of carbon dioxide was added. Then, the temperature was adjusted to an appropriate temperature for foaming, and the mixture flowed into the joining die. On the other hand, EVA (MI = 0.5, VAC: 8) was used as a binder from a 45 mm extruder.
%) Was heated and melted and flowed into a joining die. And polyethylene resin (MI =
0.3) was heated and melted and flowed into a joining die. Also, 4
High impact polystyrene resin (M
I = 5) was mixed with 0.01% of silicone oil having a viscosity of 480 cm stoichiometric dimethyl siloxane, and 135 to 29
The resin was heated and melted at a cylinder temperature of 0 ° C., and the resin was flowed into a mold die. After the respective resins were combined, they were extruded from the mold. The mold has a diameter of 110mm and a slit of 0.95mm
With a blow-up ratio of 3.0 and 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 and has a PSP / EVA / PE / EVA / HI
Was about 381/11/9/15/6. The cell shape ratio of the laminated foam sheet is MD: TD: VD = 0.9.
8: 1.27: 0.80. The peel strength of the raw material is 1
The width was 10 g / 25 mm. The extrusion rate Q per unit time was 82 kg / h. Put this laminated sheet in bowl 3
Molding was carried out at a heater temperature of 215 ° C. to 355 ° C. at a molding cycle of 5.3 sec / cycle without silicon coating in 6 pieces. The area increase rate was 1% in the MD direction. There was no problem with moldability. Printing was performed in the same manner as in Example 1, and one of the 100 containers having a printability limit was generated in the container on the molding machine side. The printability is limited to 1
If five out of 00 prints occur, it is determined that printing failure occurs due to variations. There was no problem with blocking. The film was formed with the film inside, the lid was heat-sealed, and the film was not peeled off when peeled off. Table 1 shows the above results. The peel strength between the expanded polystyrene sheet resin layer and the polyolefin film was 5 g /
The range is from 25 mm width to 400 g / 25 mm width. If it is less than 5 g / 25 mm, it will peel off during use as a container, while if it exceeds 400 g / 25 mm, it will be difficult to peel off, and if it is forcibly peeled off, the film may be broken. However, when the lid is made of easy peel, a peel strength of 200 g / 25 mm or more is required. When a barrier film or the like is laminated on a foamed sheet and molded, the lid is sealed on the film because the barrier film comes inside. In this case, the peel strength is about 100 g / 25 mm
If it is less than the width, removing the lid to use the container will peel off the film, which is a problem. In such a case,
If a concave or convex streak is formed at the position where the lid of the mold is sealed, or a groove is formed along the rib of the container in a knurling, a knurling or a ring shape, the mold is pressed by a mold press at the time of molding. The peel strength is increased by 20 to 200% only in the portion where the contact is made, and the problem can be solved. For example, when a bowl container or the like is formed, the function of the container is satisfied by strongly pressing the ribs. Unnecessary portions after the punching of the container can be separated from a film and a foam sheet made of different materials, and the collected resin is recycled. Available. The same effect becomes more remarkable when the binder is foamed or a filler is mixed with the binder. When silicon is mixed into the foam sheet and the film to be bonded to the foam sheet, care must be taken since the peel strength changes. Conversely, the peel strength can be controlled by the amount of silicon mixed. In addition, the measurement of the peeling strength
This is a measured value when peeling at a speed of 200 mm / min and 180 degrees was performed using ntec Corporation RTM-500.

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

Example 4 A mixture was added to Dirac 232 resin having an MI of 2.0 at a ratio shown in Table 1. The mixed hydrocellol was of the HK-70 type. The mold has a diameter of 95 mm and a slit of 0.9
At 5 mm, the blow-up ratio was 3.5. 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 thermal lamination of foam sheet and film, it is difficult to adhere only by heat roll.
An electric heater was used. Further, silicon was sprayed before molding, but there was no problem in printability. The cell shape ratio of the laminated foam sheet is MD: TD: VD = 0.97: 1.40: 0.7.
It was 4. When this was molded under the molding conditions shown in Table 1,
The area increase rate was 2.1% in both MD and TD.

Example 5 A foam sheet and a film were extruded and laminated using GE Plastics Noryl (containing 34% PPO) according to the blending ratio and operating conditions shown in Table 2.
(Hydrocell is HK-70 type) Laminated foam
The bubble shape ratio of MD: TD: VD = 1.05: 1.2
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 foamed sheet was obtained in the same manner as in Example 5, except that 0.05% of 100 centistokes silicone oil was mixed with the foamed sheet raw material. The film thickness of the laminated foamed sheet was 260 g / 25 mm width. The cell shape ratio of the laminated foamed sheet is MD: TD: VD = 1.07: 1.1.
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 was 125 mm in diameter, the slit was 0.9 mm, the blow-up ratio was 2.66, and the air amount was 0.17 m ³ / m ^2, and the mixture was mixed with the film. Silicone oil having a viscosity of 130,000 cm stokes was used. The blend time was extended from 7 minutes to 12 minutes with silicone oil. There was a surface with high viscosity and some difficulty in blending. The cell shape ratio of the laminated foam sheet is MD: TD: VD = 1.35:
0.99: 0.75.

Example 8 Using the composition shown in Table 2 and the same settings as in Example 1, the blowing agent (n
(Butane / i-butane = 35/65) was injected at 3.3% to obtain a foamed polystyrene sheet having 338 g / m ² and a density of 0.129 g / cc. The film is HI (MI =
1.8) and a mixture of PS (MI = 1.8) at a ratio of 1: 1. Silicon is dimethylpolysiloxane (10,000 C.I.).
S. ) Was kneaded with 1.5%. This film was printed and heat-sealed to the above-mentioned foamed polystyrene sheet (the side to be bonded to the film 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.
At 80 g / m ² , the bubble shape ratio is MD: TD: VD = 1.0
1: 1.23: 0.80 and the peel strength is 380 g /
It was 25 mm. With this laminated foam sheet, 36 bowl bowls are taken and silicone coating is not performed, and the molding machine heater temperature 22
Molding was performed at 0 ° C. to 350 ° C. in a 5.0 second cycle. The molding was good with no blocking and no problem. The film of the molded product was 352 g / 25 mm when the film was removed. The silicon determination method is to remove the film of the molded product or the laminated foamed sheet and wash it, and then determine it by high performance liquid chromatography using an eluent, tetrahydrofuran (THF) or ICP.
(High frequency plasma emission spectrometer) may be used to quantify and calculate Si.

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

Comparative Example 2 A binder and 45 m of polyethylene were used in the same manner as in Example 2.
Stop the extruder and increase the film ratio to 140μ
m, the air amount was 0.23 m ³ / m ² , the area increase rate during molding was 0.5%, and the bubble shape was MD: TD: VD =
1.15: 1.44: 0.6 1 on the molding machine side
Defective elongation occurred in some containers. In addition, there was a problem in printability at a ratio of 16/100 where only containers having good molding were collected and printed. There was also a problem with the blocking test. Next, when the air amount was set to 0.18 m ³ / m ² , the area increase rate at the time of molding was 1.5%, and the poor elongation 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:
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 became 13%, and uneven heating occurred on the PSP side. The cell shape ratio of the laminated foam sheet is MD: TD: VD =
1.01: 1.24: 0.80.

Comparative Example 4 In the same manner as in Example 1, 3.2 parts of silicone oil were injected into the film by the injection method, but the appearance of the film became poor and the printability was poor. The cell shape ratio of the laminated foam sheet is MD:
TD: VD = 0.99: 1.23: 0.82.
Tables 1, 2 and 3 summarize the above results. The melt viscosity (MI) of the resin was measured by the following method depending on the type of the resin. Polystyrene (PS): JIS-K 6870 Polyethylene (PE): JIS-K 6760 Ethylene-vinyl acetate copolymer (EVA): JIS-K
6730 Styrene-maleic anhydride copolymer (Dilaq): 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 foamed sheet, the film side of the laminated foamed sheet has an area increased by 1 to 11% with respect to the original unit area. Thus, a bowl-shaped container, which is a deep drawn product, can be formed without any trouble, and the thermoplastic film contains 0.01 to 3% by weight of silicone oil so as to print uniformly without causing printing unevenness. Thus, effects such as no blocking were produced.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 B65D 1/00-1/48 B65D 65/40

Claims (5)

(57) [Claims] 1. An outer layer of a laminated film of a polystyrene-based resin foam container, wherein a single-layer or multilayer thermoplastic resin film having a thickness of 5 to 550 μm is laminated on at least one surface of the main body. 0.0 for film
1-3 wt% of silicone oil are contained, Porisuchi
The container body made of ren-based resin foam and the thermoplastic resin film
A container having a peel strength of at least 100 g / 25 mm . 2. A small polystyrene resin foam container body.
At least one surface has a single layer of 5 to 550 μm or multiple layers.
In a container laminated with a thermoplastic resin film
The outer layer film of the laminated film
Contains 1-3% by weight of silicone oil, silicon
Printing is performed on at least one side of the oil-containing film.
A container characterized by being made . 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. A single-layer or multi-layer thermoplastic resin film
At least one layer of a gas barrier resin
The container according to claim 2 , characterized in that: 5. The method according to claim 5, wherein the silicon oil is 100,000
The container according to claim 1, 2, 3, or 4, wherein the container has a kinematic viscosity of chistox .