JP2008087819A - Drawn paper container and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drawn paper container capable of easily separating at a degree of human force without unintentional separation of a thermoplastic resin layer at the time of its use or breakage of the thermoplastic resin layer after its use. <P>SOLUTION: The drawn paper container includes a paper base material having a surface to which a smoothing processing is therein applied, an separating print layer formed on the surface of the paper base material which undergoes the smoothing processing, and a thermoplastic resin layer separably laminated between the thermoplastic resin layer and separating print layer by applying extrusion-coating a thermoplastic resin on the exfoliating print layer. The drawn paper container is formed by drawing a blank sheet in which groove-shaped ruled lines are provided from a paper base material side, and projecting drawn wrinkles caused by the groove-shaped ruled lines are also formed on a thermoplastic resin layer side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drawn paper container and a method for manufacturing the same.

  A dish-shaped or ball-shaped paper container formed by drawing a blank sheet in which a thermoplastic resin layer is laminated on one or both sides of a paper base material is known, and is widely spread mainly in food applications ( For example, see Patent Document 1). In these paper containers, a blank sheet in which a thermoplastic resin layer is laminated on one or both sides of a paper base is supplied between a male die and a female die of a molding machine, and drawn by a male die and a female die. Manufactured by. Usually, on the side of the blank sheet in contact with the male mold, a groove-like ruled line is provided for uniformly producing a drawing wrinkle during drawing.

JP 2001-96648 A

In recent years, with the growing awareness of environmental issues, development of products that can be recycled into the above-mentioned paper containers is also required. However, since blank sheets used in conventional paper containers are generally produced by extrusion coating a thermoplastic resin on a paper substrate, the thermoplastic resin layer can be sufficiently peeled from the paper substrate. In some cases, part of the thermoplastic resin remains on the paper base, making it difficult to recycle as paper, or the thermoplastic resin layer unintentionally peels off when using a paper container. .
Therefore, the present inventors adjusted the peel strength by forming a release printing layer on the surface of the paper substrate that has been smoothed, and further extrusion-coating a thermoplastic resin on the release printing layer. A blank sheet was prepared, and an attempt was made to produce a drawn paper container using the blank sheet. And, when the thermoplastic resin layer was peeled off from the drawn paper container, the thermoplastic resin layer was broken at the portion where the drawn wrinkles occurred, and the paper base material and the thermoplastic resin layer could not be easily separated. Faced a problem.

  Therefore, the present invention has been made in view of the above circumstances, and when used, the thermoplastic resin layer does not unintentionally peel off, and after use without breaking the thermoplastic resin layer. It is an object of the present invention to provide a drawn paper container that can be easily separated by force.

A first invention for achieving the above object is a paper base material having a smoothed surface, and a release printing layer formed on the smoothed surface of the paper base material. And a thermoplastic resin layer laminated so as to be peelable between the release printing layer by extrusion-coating a thermoplastic resin on the release printing layer, and a grooved ruled line is provided from the paper substrate side. A drawn paper container formed by drawing a blank sheet, wherein a drawn paper bottle having a convex shape caused by a grooved ruled line is formed on the thermoplastic resin layer side. It is a made container.
The grooved ruled line is drawn from the vicinity of the boundary between the bottom part of the drawn paper container and the side wall part connected to the bottom part so as to extend radially outward from the inside of the blank sheet. It is preferable that a plurality are provided up to the vicinity of the outer edge of the container.
In addition, a portion corresponding to the flange portion that is continuously provided on the side wall portion of the drawn paper container and is turned back to the outside of the container is provided with a plurality of groove-shaped auxiliary members that extend radially from the inside to the outside of the blank sheet. It is preferable that a ruled line is further provided from the paper substrate side.

  According to a second aspect of the invention, there is provided a paper base material having a smoothed surface, a release printing layer formed on the smoothed surface of the paper base material, and a release print layer. A plurality of groove-like ruled lines extending radially from the inside to the outside of a blank sheet comprising a thermoplastic resin layer laminated so as to be peelable between the release printing layer by extrusion coating of a thermoplastic resin The blank sheet is supplied between the male mold and the female mold so that the thermoplastic resin layer side of the blank sheet provided with the grooved ruled line is the male mold side. A method for producing a drawn paper container, characterized in that a drawn paper bottle is formed on the side of the thermoplastic resin layer by drawing with a pressure.

  A third invention is a drawn paper container characterized by being obtained by the manufacturing method described above.

  According to the present invention, the diaphragm can be easily separated by human power without unintentionally peeling off the thermoplastic resin layer when used and without breaking the thermoplastic resin layer after use. A molded paper container can be provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 are a schematic sectional view and a plan view, respectively, of a blank sheet for forming the drawn paper container according to the present embodiment.
1 and 2, a circular blank sheet 1 includes a paper base 3 having a surface 2 that has been subjected to a smoothing process, and a release printing layer 4 formed on the surface 1 that has been subjected to a smoothing process. And the thermoplastic resin layer 5 laminated on the peeling printing layer 4, and is configured to be peelable between the peeling printing layer 4 and the thermoplastic resin layer 5. In FIG. 2, the inner side indicated by a broken line is a bottom surface portion 6 corresponding to the bottom portion of the drawn paper container, and the outer portion from the bottom surface portion 6 corresponds to the side wall of the drawn paper container. Part 7.
In the present embodiment, a plurality of groove shapes extending radially from the center point 8 located at the center of the circular blank sheet 1 toward the outer edge from the inner side to the outer side of the circular blank sheet 1. Ruled lines 9 are provided from the paper substrate 3 side. This groove-like ruled line 9 is for facilitating the formation of a convex drawing rod on the thermoplastic resin layer 5 side when the blank sheet 1 is drawn. Although the length of the groove-like ruled line 9 varies depending on the shape of the container to be molded, it should be provided from the vicinity of the boundary between the bottom surface portion 6 of the container and the side wall portion 7 connected to the bottom surface portion to the vicinity of the outer edge of the drawn paper container. Thus, it can be formed into a smoother container. Moreover, although the area | region which provides the groove-like ruled line 9 changes with the shape of the container to shape | mold, in the case of a circular container like this Embodiment, it is desirable to provide in the perimeter of the blank sheet 1, and in the case of an elliptical shape It is desirable to provide the entire circumference of the blank sheet 1 so that the interval between the groove-like ruled lines 9 is narrow in the vicinity of the intersection of the long axis and the outer edge, and in the case of a rounded quadrangular or rounded triangular shape, the corner of the blank sheet 1 It is desirable to provide in. In addition, the width, depth, and line spacing of the grooved ruled line 9 may be appropriately determined according to the shape of the target drawn paper container.

  When this blank sheet 1 is drawn and formed so that the thermoplastic resin layer 5 side is the inside of the container, a lot of drawn wrinkles due to the groove-like ruled lines 9 are formed on the thermoplastic resin layer 5 side. A circular tray shape according to the present embodiment as shown in FIGS. 3 and 4 is formed such that the circumferential distance of the ruled line 9 is reduced and the outer periphery is reduced from the blank sheet 1 and the blank sheet 1 is compressed in the thickness direction. A drawn paper container is obtained. 3 and 4 are a side view and a perspective view, respectively, of a circular tray-shaped drawn paper container according to the present embodiment. 3 and 4, a circular tray-shaped drawn paper container has a bottom surface portion 6, a side wall portion 7 that curves and rises in the periphery of the bottom surface portion 6, and is connected to the side wall portion 7. And an annular, substantially horizontal flange portion 10 that is folded back to the outside, and from the side wall portion 7 to the flange portion 10, a convex diaphragm caused by the grooved ruled line 9 on the thermoplastic resin layer 5 side. Many ridges 11 are formed. FIG. 5 is a schematic cross-sectional view of the A-A ′ portion of FIG. 4. As shown in FIG. 5, in the circular tray-shaped drawn paper container according to the present embodiment, a convex drawing rod 11 due to the grooved ruled line 9 is formed on the thermoplastic resin layer 5 side. Therefore, the thermoplastic resin layer 5 is sandwiched with a certain distance. Therefore, it is considered that the thermoplastic resin layer 5 can be easily separated from the drawn paper container without breaking. On the other hand, as shown in FIG. 6, in the drawn paper container in which the concave drawing rod 12 is formed on the thermoplastic resin layer 5 side, the thermoplastic resin layer 5 is a convex drawing rod 11. Is also pinched at narrow intervals. Therefore, in this container, in order to peel the thermoplastic resin layer 5 from the paper base material 3, this part functions as an anchor, and the thermoplastic resin layer 5 cannot be easily peeled off. Depending on this, it is considered that the thermoplastic resin layer 5 is broken.

In the above-described embodiment, the circular tray-shaped drawn paper container has been described. However, the container is not particularly limited as long as it can be drawn, and may be a rounded square, a rounded triangle, an ellipse, or a polygon. Good. For example, FIG. 7 is a perspective view of a rounded square tray-shaped drawn paper container, and FIG. 8 is a plan view of a rounded square blank sheet 1 for molding the drawn paper container of FIG. It is. In FIG. 8, from four inner points 8a, 8b, 8c, 8d corresponding to the four curved portions of the rounded blank sheet 1 from the inside to the outside, that is, the rounded square blank sheet 1, respectively. Except that a plurality of groove-like ruled lines 9 extending radially from the closest curved portion to the outer edge are provided from the paper base material 3 side, the configuration is the same as that of the circular blank sheet 1. The same reference numerals are given and the description thereof is omitted.
Further, as shown in FIG. 9, the portion corresponding to the flange portion 10 of the circular blank sheet 1 is located from the inside of the blank sheet 1 to the outside, that is, at the center of the circular blank sheet 1. A plurality of groove-like auxiliary ruled lines 13 extending radially from the center point 8 toward the outer edge may be provided. The arrangement and length of the groove-like auxiliary ruled lines 13 are not particularly limited, but are preferably provided from the vicinity of the boundary between the side wall part 7 and the flange part 10 to the vicinity of the outer edge so as to alternate with the groove-like ruled line 9. By providing the groove-shaped auxiliary ruled line 13 as described above, the convex wrench 11 is uniformly formed on the thermoplastic resin layer 5 side, and as a result, the easy peelability of the drawn paper container is further improved. Can be made. Further, the outer peripheral end of the flange portion 10 of the drawn paper container may be curled. By processing in this way, the shape retention of the drawn paper container can be improved.

Next, the material which comprises the blank sheet 1 for shape | molding a draw-molded paper container is demonstrated.
The paper base 3 in the blank sheet 1 used in the present invention is at least a known paper such as a paperboard such as a coated ball, card paper, ivory paper, or manila ball, milk carton base paper, cup base paper, kraft paper, or fine paper. The smoothness of the paper substrate 3 is sufficient as long as it is smoothed on one side, but the smoothness of the paper substrate 3 is a peeling printing layer 4 formed thereon and a thermoplastic resin layer laminated on the peeling printing layer 4. In order to affect the peel strength between 5 and 5, a paper base having a Beck smoothness of the surface of preferably 25 seconds or more, more preferably 80 to 400 seconds is preferred. If the Beck type smoothness of the surface 2 subjected to the smoothing process is within the above range, the blank sheet 1 is easily peelable after using the drawn paper container without impairing the practical structural integrity. Can be further improved. The Beck type smoothness here is based on JIS P 8119, using a Beck type smoothness tester, passing between the surface of the paper base 3 and the glass standard surface of the optical flat finish, The time (seconds) required for a certain amount of air to enter the vessel was measured. The measurement is performed five times, and the arithmetic average is defined as the Beck smoothness of the paper base 3.
Moreover, the basic weight of the paper base material 3 is not specifically limited, What is necessary is just to determine suitably according to the form of the draw-formed paper container using the blank sheet 1. FIG.

As such a smoothing process, a surface coating agent containing clay, talc, aluminum hydroxide, titanium dioxide, precipitated calcium carbonate and the like widely used in the field of paper processing is applied (coated) to the paper substrate 3. The method of doing is mentioned. Among these, it is preferable to apply a surface coating agent containing clay from the viewpoint of reducing processing costs while obtaining desired smoothness. The amount of the surface coating agent applied to the paper substrate 2 is not particularly limited, but a range of 5 to ²⁰ g / m ² is preferable. If the coating amount is less than 5 g / m ² , the peel strength may be unnecessarily high, and if the coating amount exceeds 20 g / m ² , the peel strength tends to vary.

The printing layer 4 for peeling in the blank sheet 1 used in the present invention is made of polyamide, polyester, urethane, rubber, acrylic, chlorinated polypropylene, butyral, vinyl chloride-vinyl acetate copolymer, nitrified cotton, or the like. The printing ink for peeling which has resin as a main component can be formed by printing. Among such printing inks for peeling, those based on acrylic resin and nitrified cotton, which are excellent in heat resistance and peelability, are preferred. Moreover, you may add silicone etc. to the printing ink for peeling other than the said resin as needed. As printing, a known printing method can be used without limitation, but it is preferable to use gravure printing because the coating amount is stable and the productivity is high. The coating amount of the release printing ink to the surface 2 of the smoothing processing has been performed is not particularly limited, is preferably from 0.5 to 10 g / ^{m 2,} at 1 to 5 g / ^{m 2} More preferably it is. If the coating amount is less than 0.5 g / m ² , the peel strength may be unnecessarily high, and even if an amount exceeding 10 g / m ² is applied, the peelability is hardly changed and the cost is wasted. Therefore, it is not preferable. Moreover, it is difficult to apply an amount exceeding 10 g / m ² by gravure printing.
Moreover, you may perform a corona discharge process on the surface of the printing layer 4 for peeling formed in this way. By performing the corona discharge treatment, the peel strength between the peelable print layer 4 and the thermoplastic resin layer 5 can be adjusted. The corona discharge treatment can be performed by using a known corona discharge treatment device and passing the paper substrate 3 on which the peeling printing layer 4 is formed in the generated corona atmosphere. The corona discharge output at this time is preferably 1 to 10 kW, more preferably 4 to 6 kW.

The thermoplastic resin layer 5 is composed of medium density polyethylene, high density polyethylene, high pressure method low density polyethylene, Ziegler type low density polyethylene, linear (linear) low density polyethylene, ethylene and α-olefin polymerized using a metacelon catalyst. Copolymer, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer Polymers, ethylene-propylene copolymers, methylpentene polymers, polybutene polymers, polyolefin resins such as polyethylene and polypropylene, and unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid Acid-modified polyolefin modified with Fin resins, polyvinyl acetate resins, poly (meth) acrylic resin, polyvinyl chloride resin, polyester resin, and a thermoplastic resin nylon resin. Among these, low density polyethylene and polypropylene which are excellent in balance between cost and processability are preferable. Low-density polyethylene is preferably used if the temperature of the contents contained in the drawn paper container according to the present invention is less than 100 ° C, and polypropylene is used if the temperature of the contents is 100 to 160 ° C. preferable.
The thickness of the thermoplastic resin layer 5 is not particularly limited, but is preferably formed in the range of 15 to 150 μm, and more preferably in the range of 30 to 120 μm.

In the blank sheet 1 used to mold the drawn paper container according to the present invention, the peel strength between the peelable print layer 4 and the thermoplastic resin layer 5 is 0.049 to 1.96 N / 15 mm width. It is preferable that it is 0.098-0.196N / 15mm width. If the peel strength is within the above range, the thermoplastic resin layer 5 is not easily peeled off when the drawn product is processed and when the processed product is used, and the thermoplastic resin layer is removed from the used drawn container. 5 can be peeled off more easily. In the measurement of peel strength, first, a blank sheet 1 (or a sheet before punching) is cut out 100 mm at a width of 15 mm to form a test piece, and the paper and the resin film are peeled up to 60 mm from one of the cut out test pieces, and then pulled Chuck on both chucks of the testing machine. The distance between chucks is 100 mm. And it peels in the direction of 180 degree | times at a tension speed of 50 mm / min in 25 degreeC atmosphere, and measures a maximum load. The measurement is performed 10 times, and the arithmetic average is defined as the peel strength between the peelable print layer 4 and the thermoplastic resin layer 5.
The peel strength defined in this way varies depending on the type and amount of release printing ink used to form the release print layer 4, the type of thermoplastic resin used in the thermoplastic resin layer 5, extrusion coating processing conditions, and the like. Therefore, it is possible to increase or decrease appropriately. For example, the peeling strength can be increased by increasing the corona discharge output applied to the surface of the peeling printing layer 4. On the other hand, for example, the peel strength can be reduced by lowering the extrusion temperature of the thermoplastic resin.

  In the blank sheet 1, a layer made of aluminum foil, PET, or the like may be appropriately laminated on the thermoplastic resin layer 5 as long as the effects of the present invention are not impaired. In addition, a layer made of a thermoplastic resin or the like may be laminated on the surface of a paper base material that has not been subjected to a smoothing process within a range not impairing the effects of the present invention.

  Next, a method for producing a drawn paper container according to the present invention will be described. In this manufacturing method, first, a paper base 3 having a smoothed surface 2, a release printing layer 4 formed on the smoothed surface 2 of the paper base 3, and a release The blank sheet 1 provided with the thermoplastic resin layer 5 laminated | stacked so that peeling between the layers with the printing layer 4 for peeling by extrusion-coating a thermoplastic resin on the printing layer 4 for printing is prepared.

  The blank sheet 1 includes a step of printing a release printing ink on the surface 2 of the paper base 3 that has been smoothed to form a release print layer 4, and a thermoplastic resin on the release print layer 4. It is prepared by a method including a step of laminating an extruded thermoplastic resin layer 5 by extrusion coating and a step of punching a blank sheet having a predetermined shape. As a printing method of the peeling printing ink, known gravure printing, planographic printing, letterpress printing, screen printing and the like can be used without limitation. Among these, it is preferable to use gravure printing because the coating amount is stable, productivity is high, and extrudability at the time of product processing is good. In addition, in order to improve the aesthetics of the finally obtained draw-formed paper container, before the release printing layer 4 is formed, a pattern / Printing such as display may be performed. The extrusion coating of the thermoplastic resin onto the release printing layer 4 can be performed by a known method. For example, when a high pressure method low density polyethylene having a melting point of 105 to 115 ° C. is used as the thermoplastic resin for forming the thermoplastic resin layer 5, the extrusion coating processing conditions are an extrusion temperature of 320 ° C. or more and a line speed of 45 to 200 m / min. You only have to set it. When polypropylene having a melting point of 130 to 165 ° C. is used as the thermoplastic resin for forming the thermoplastic resin layer 5, the extrusion coating processing conditions may be set to an extrusion temperature of 280 ° C. or more and a line speed of 45 to 200 m / min. . Here, the extrusion coating processing conditions in the case of using high-pressure method low-density polyethylene and polypropylene as the thermoplastic resin have been described. However, in other resins, the processing conditions can be appropriately set according to the properties of the resin. Finally, a plurality of groove shapes extending radially from the inside to the outside by pressing the sheet from the paper base 3 side toward the thermoplastic resin layer 5 side at the same time A blank sheet 1 having a predetermined shape in which ruled lines 9 are provided on the paper substrate side can be obtained. The processing of the grooved ruled line 9 may be performed before the blank sheet 1 is punched without performing the blank sheet 1 simultaneously with the punching process, or may be performed after the blank sheet 1 is punched.

  Next, the blank sheet 1 provided with the grooved ruled lines 9 is drawn into a drawn paper container, and this drawing is performed as shown in FIG. 10 in which the thermoplastic resin layer 5 side of the blank sheet 1 is a molding machine. The blank sheet 1 is supplied between the male mold 14 and the female mold 15 so as to be on the male mold 14 side, and is pressed by the male mold and the female mold. The molding pressure and molding temperature at this time are not particularly limited, and may be appropriately determined according to the shape of the target drawn paper container.

  Since the drawn paper container produced in this way can be easily peeled off after use without breaking the thermoplastic resin layer 5, paper and plastic can be separately collected and reused. Therefore, it can be said that the drawn paper container according to the present invention is extremely excellent in terms of effective use of resources and protection of the global environment.

Hereinafter, the present invention will be described in more detail with reference to examples. However, these are merely examples and do not limit the present invention.
<Example 1>
First, nitrified cotton is applied to the clay coated surface (Beck type smoothness of 265 seconds) of a paperboard having a basis weight of 320 g / m ² (NEW Ultra H; manufactured by Nippon Daishowa Paperboard Co., Ltd.), which is a paper base coated on one side with clay. A printing ink for peeling (CP-2K; manufactured by Dainichi Seika Kogyo Co., Ltd.) was printed by gravure printing using a solid plate having a plate depth of 30 μm and dried to form a peeling printing layer. Next, a corona discharge treatment was applied to the surface of the formed release printing layer at an output of 4.5 kW. Next, a high-pressure low-density polyethylene (LC520; manufactured by Nippon Polyethylene Co., Ltd., melting point 111 ° C.), which is a thermoplastic resin, was extruded from a die of an extruder, and a 60 μm-thickness was formed on the release printing layer subjected to corona discharge treatment. A sheet was prepared by forming a thermoplastic resin layer. The extrusion coating processing conditions at this time were set at an extrusion temperature of 320 ° C. and a line speed of 80 m / min. As a result of measuring the peel strength of the sheet before punching thus obtained, it was 0.152 N / 15 mm width.

Next, the obtained sheet is punched into a circular shape, and at the same time, the width is 1.3 mm, the depth is 0.4 mm, and the distance in the vicinity of the outer edge is so that the sheet is almost radial from the inside to the outside. A blank sheet similar to that shown in FIG. 2 was obtained by providing a grooved ruled line of 8 mm from the paper substrate side. 3 and 4 having a diameter of 195 mm (including a flange width of 15 mm) × depth of 42 mm, which is drawn by a deep drawing machine so that the thermoplastic resin layer side of the blank sheet is the male side. A drawn tray paper container having a circular tray shape similar to that of the above was prepared. Note that no peeling of the thermoplastic resin layer was observed during the molding process. Further, when a cross section of the flange portion of the container was observed with a microscope, it was found that most of the drawing rods were convexly formed on the thermoplastic resin layer side due to the grooved ruled line as shown in FIG. confirmed.
After actually using this container, the thermoplastic resin layer was peeled off from the container. As a result, the thermoplastic resin layer could be easily removed without breaking, and paper and plastic could be separated.

<Example 2>
The same sheet as obtained in Example 1 is punched into a rounded square shape, and at the same time, the width is 1.5 mm and the depth is so as to be almost radial from the inside of the sheet rounded portion to the outside. A grooved ruled line having a distance of 0.4 mm and a distance of 4 mm in the vicinity of the outer edge was provided from the paper substrate side to obtain a blank sheet as shown in FIG. And it draw-draws with a deep drawing machine so that the thermoplastic resin layer side of this blank sheet may be the male side, 120 mm long (including 8 mm wide flange portion) × 120 mm wide (including 8 mm flange flange width) ) × Drawn paper container having a rounded square tray shape as shown in FIG. Note that no peeling of the thermoplastic resin layer was observed during the molding process. Further, when a cross section of the flange portion of the container was observed with a microscope, it was found that most of the drawing rods were convexly formed on the thermoplastic resin layer side due to the grooved ruled line as shown in FIG. confirmed.
After actually using this container, the thermoplastic resin layer was peeled off from the container. As a result, the thermoplastic resin layer could be easily removed without breaking, and paper and plastic could be separated.

<Comparative Example 1>
A circular tray-shaped drawn paper container of Comparative Example 1 was produced in the same manner as in Example 1 except that the grooved ruled line was provided from the thermoplastic resin layer side. No peeling of the thermoplastic resin layer was observed during the molding process. Further, when the cross section of the flange portion of the container was observed with a microscope, it was confirmed that most of the drawing rods were formed concavely on the thermoplastic resin layer side due to the grooved ruled line as shown in FIG. It was done.
After actually using this container, the thermoplastic resin layer was peeled off from the container. As a result, the thermoplastic resin layer was hardly peeled off, and the thermoplastic resin layer was broken at the drawing rod portion formed on the flange portion.

It is a schematic cross section of the blank sheet for shape | molding the draw-paper-made container which concerns on embodiment. It is a top view of the blank sheet for shape | molding the circular tray-shaped draw-formed paper container which concerns on embodiment. It is a side view of the circular tray-shaped draw-formed paper container which concerns on embodiment. 1 is a perspective view of a circular tray-shaped drawn paper container according to an embodiment. It is a schematic cross section of the A-A 'portion of the circular tray-shaped drawn paper container according to the embodiment. FIG. 3 is a schematic cross-sectional view of a drawn paper container in which a concave drawn cup is formed on the thermoplastic resin layer side. FIG. 3 is a perspective view of a drawn paper container having a rounded rectangular tray shape according to the embodiment. It is a top view of the blank sheet for shape | molding the round-circle square tray shape draw-formed paper container which concerns on embodiment. It is a top view of the blank sheet for shape | molding the draw-paper-made container which concerns on other embodiment. It is a schematic sectional drawing of the drawing process in the manufacturing method of the circular tray-shaped drawn paper container which concerns on embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Blank sheet, 2 surface smoothed, 3 paper base material, 4 printing layer for peeling, 5 thermoplastic resin layer, 6 bottom face part, 7 side wall part, 8, 8a, 8b, 8c, 8d center point , 9 Groove ruled line, 10 Flange, 11 Convex iris, 12 Concave iris, 13 Groove auxiliary ruled line, 14 Male type, 15 Female type.

Claims (5)

A paper base having a smoothed surface, a release printing layer formed on the smoothed surface of the paper base, and extrusion coating of a thermoplastic resin on the release printing layer Made by drawing a blank sheet provided with a thermoplastic resin layer which is laminated so as to be peelable between the release printing layer and a groove-like ruled line provided from the paper substrate side. A container,
2. A drawn paper container characterized in that a convex drawn wrinkle due to a grooved ruled line is formed on the thermoplastic resin layer side.   From the vicinity of the boundary between the bottom part of the drawn paper container and the side wall part connected to the bottom part so that the groove-like ruled line extends radially from the inside to the outside of the blank sheet. 2. The drawn paper container according to claim 1, wherein a plurality of paper containers are provided up to the vicinity of the outer edge of the container.   In the portion corresponding to the flange portion connected to the side wall portion of the drawn paper container and folded back to the outside of the blank sheet, a plurality of groove shapes extending radially from the inside toward the outside of the blank sheet The drawn paper container according to claim 2, wherein auxiliary ruled lines are further provided from the paper substrate side.   A paper base having a smoothed surface, a release printing layer formed on the smoothed surface of the paper base, and extrusion coating of a thermoplastic resin on the release printing layer A plurality of groove-like ruled lines extending radially from the inside to the outside of the blank sheet provided with a thermoplastic resin layer laminated so as to be peelable between the printing layer for peeling from the paper substrate side. The blank sheet is provided between the male mold and the female mold so that the thermoplastic resin layer side of the blank sheet provided with the groove-like ruled line is the male mold side, and is squeezed by pressing with the male female mold A method for producing a drawn paper container, characterized by forming a drawn wrinkle resulting from a grooved ruled line on the thermoplastic resin layer side.   A drawn paper container obtained by the manufacturing method according to claim 4.

Images