JP2009166863A - Container for sealing beverage, food or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container for sealing, using a composite material of an aluminum foil and a synthetic resin coating layer, equipped with a flange structure which has a strength necessary for unsealing or mounting an over-cap, has no possibility of cutting a user's hand and a mouth by a flange edge, and is compatible with a filling and sealing machine for a synthetic resin container. <P>SOLUTION: The container for sealing a beverage, a food or the like, is a tapered cup-like container (A) which is obtained by cold multi-stage deep drawing of a composite material (4) consisting of an aluminum foil core layer (1) with a thickness of 120 μm, an undrawn polypropylene coating layer (2) with a thickness of 200 μm formed on its inner face, and an undrawn polypropylene coating layer (3) with a thickness of 30 μm formed on its outer face, and is equipped with a flange (6) with a width of 5 mm which is a double structure prepared by folding back the peripheral edge part (5a) of the flange (5) downward and with a flange base part (5b). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

   The present invention relates to a sealed container for beverages and foods such as coffee, tea, soup and dessert.

  In this specification, the flange base portion refers to approximately half of the outer periphery of the container before folding, and the flange peripheral portion refers to the remaining approximately half.

  Although there is a synthetic resin container as the above-mentioned sealed container, in order to maintain the flavor of the contents, a composite material container comprising an aluminum foil layer and a double-sided synthetic resin coating layer as shown in Patent Document 1 below Is better.

 However, in the case of the above composite material container, since the material thickness is thinner and the flange strength is weaker than that of the synthetic resin container, when the heat-sealed lid is opened, the flange can also be opened to be lifted together. In the case of a beverage container, the lid made of aluminum foil is stabbed with a straw so that the manufacturer can attach a synthetic resin overcap to the lid so that dust does not adhere to the top of the lid. There was a problem that the flange was bent and could not be fitted over the mouth of the container.

  Therefore, when the aluminum foil or the synthetic resin coating layer of the composite material is thickened, the manufacturing cost increases, and when the thickness is increased, there is a possibility that the hand or mouth is cut at the edge of the flange having increased strength.

In order to solve this problem, a curl edge may be formed on the flange of the container as shown in Patent Document 2 below.
JP 2005-153894 A JP 2007-111501 A

  If the curled edge is formed on the flange, there is no risk of cutting the hand or mouth at the end of the flange, but considering the flange width necessary for heat sealing with the lid made of aluminum foil having a heat sealing material layer on the lower surface, Since the curl edge is larger than the flange of the synthetic resin container, it becomes difficult to use it as a filling sealer for the synthetic resin container. Because the filling and sealing machine for synthetic resin containers has a flat upper and lower mold surface, if there is a curled edge on the flange, the upper and lower surfaces of the flat portion of the flange and the flat surfaces of the upper and lower molds facing this surface This is because a gap is generated in the gap and a sealing failure occurs.

  The present invention is a sealing container using a composite material of an aluminum foil and a double-sided synthetic resin coating layer thereof, which has a strength necessary for opening or mounting an overcap, and there is a risk of cutting a hand or mouth at the flange edge. Furthermore, another object is to provide a sealing container having a flange structure that can also be used as a filling sealing machine for synthetic resin containers.

  The container for sealing beverages, foods and the like according to the invention of claim 1 is formed by forming a tapered cup-shaped container with a composite material comprising an aluminum foil core layer and a synthetic resin coating layer formed on both sides thereof. The flange peripheral edge portion is folded downward to form a double structure with the flange base portion.

  According to a second aspect of the present invention, in the container for sealing beverages and foods according to the first aspect, the thickness of the composite material is 0.1 to 0.8 mm.

  According to a third aspect of the present invention, in the container for sealing beverages, foods, etc. according to the first aspect, the flange peripheral portion folded downward is not less than 1/3 of the width of the flange lower surface before being folded back, and is provided on the outer peripheral surface of the container. It is just below the length reached.

  According to a fourth aspect of the present invention, in the container for sealing beverages, foods and the like according to the first aspect, the vertical distance from the upper surface of the flange base to the lower end of the flange peripheral edge is 2 to 5 times the thickness of the composite material. It is what is.

  In the invention of claim 2, the thickness of the composite material is limited to 0.1 to 0.8 mm. If it is thinner than 0.1 mm, the strength of the entire container is insufficient, and even if it exceeds 0.8 mm, the effect is changed. In this range, the more preferable thickness is 0.2 to 0.6 mm.

 In the invention of claim 3, it is less than 1/3 that it is limited to not less than 1/3 of the flange lower surface width before turning back the flange peripheral part folded back downward and just reaching the outer peripheral surface of the container. When the lid is heat-sealed on the upper surface of the double-structured flange, the length of the double part is too short, and the way the pressure is applied between the double part and the single part is different. For this reason, when a seal failure occurs and the length of the flange peripheral portion folded back downward exceeds the length that just reaches the outer peripheral surface of the container, the tip bends downward and the flange seal of the filling sealer This is because the payment becomes worse.

  In the invention of claim 4, the vertical distance from the upper surface of the double-structured flange to the lower edge of the flange peripheral edge that is folded back is limited to 2 to 5 times that of the composite material. Since there is no gap between the upper and lower layers of the flange of the structure and the thickness is less than the thickness of the composite material itself, there is a risk of material cracking at the flat part or the folded end of the flange. When the lid is heat-sealed to the flange, the pressure applied to the flange will become uneven and cause a seal failure. This is because when mounting, the inclination angle of the transverse section of the flange peripheral portion folded back is too large, which causes mounting failure.

A tapered cup-shaped container having a flat flange is manufactured by the method disclosed in Patent Document 1. That is, when forming a tapered cup-shaped container equipped with a flange by deep drawing a laminated sheet composed of an aluminum foil core layer and a synthetic resin coating layer formed on both surfaces thereof, the deep drawing process is A multi-stage process comprising a bottomed straight cylinder forming process for forming a blank into a bottomed straight cylinder and a bottomed tapered cylinder forming process for forming the bottomed straight cylinder following this process into a bottomed cylindrical cylinder. It is a process. The bottomed straight cylindrical body forming step includes a first step of forming a blank into a bottomed straight cylindrical shape, and a first step of further deep drawing the bottomed straight cylindrical body obtained in the first step. Alternatively, it consists of a plurality of steps. In the bottomed tapered cylinder forming step, the taper angle applied to the cylinder is 1 to 5 °, and the drawing ratio is 80% or more.

  To make a double structure by folding the flange periphery of a tapered cup-shaped container downward, first, a tapered cup shape having a vertically bent flange periphery where the periphery of the horizontal flange is bent substantially perpendicularly downward It is necessary to prepare a container. There are the following two methods. First, after forming a tapered cup-shaped container having a horizontal flange slightly larger than a predetermined width for obtaining a double-structured flange, the peripheral edge of the horizontal flange is trimmed to form a horizontal flange having a predetermined width. This is a first method consisting of two steps: a step and a second step of bending the peripheral edge of the horizontal flange having a predetermined width downward at a substantially right angle to form a vertical bent flange peripheral part. It is the 2nd method of shape | molding the tapered cup-shaped container which has a perpendicular bending flange peripheral part from the beginning. Since the second method has a non-uniform material elongation at the time of molding, there is a problem that non-uniformity occurs in the vertical length of the peripheral edge of the vertical bending flange. Therefore, the first method is preferable.

  The peripheral edge of the vertically bent flange of the tapered cup-shaped container obtained as described above is bent inwardly with a mold for inwardly inclined bending, and finally the peripheral edge of the inwardly inclined flange is molded for pressure. Press the horizontal flange base side with a mold to obtain a double-structured flange.

  According to the container for sealing beverages and foods of the present invention, a tapered cup-shaped container is formed of a composite material comprising an aluminum foil core layer and a synthetic resin coating layer formed on both surfaces thereof. Since the flange has a double structure with the flange periphery folded back, it has the strength necessary for opening or attaching an overcap, there is no risk of cutting the hand or mouth at the flange edge, and synthesis There is an advantage that it can also be used as a filling sealer for resin containers.

  In order to specifically explain how the present invention is carried out, examples are given below.

  The container for sealing beverages and foods according to the present invention shown in FIGS. 1 to 3 has a tapered cup-shaped container (A) formed of an aluminum foil core layer (1) having a thickness of 120 μm and an inner surface thereof. A composite (4) (see FIG. 3) comprising an unstretched polypropylene coating layer (2) made of a 200 μm-thick film and an unstretched polypropylene coating layer (3) made of a 30 μm-thick film formed on the outer surface thereof A flange having a width of 5 mm, which is obtained by cold multi-stage deep drawing and has a double structure with the flange base (5b) by folding the peripheral edge (5a) of the flange (5) downward. (6) is provided.

In the above, the flange peripheral part (5a) folded down is a length smaller than ½ of the width of the flange (5) before folding back. In addition, the vertical distance (L ₁ ) from the upper surface of the flange base portion (5b) to the lower edge of the front end of the flange peripheral portion (5a) shown by the solid line is about 2.4 times the thickness of the composite material (4). 0.85 mm. The flange peripheral part (5a) indicated by the solid line is folded back so as to be horizontal, but the flange peripheral part (5a) indicated by the chain line is slightly inwardly inclined to return to the original state. As a result, the vertical distance (L ₂ ) from the upper surface of the flange base portion (5b) to the lower edge of the front end of the flange peripheral portion (5a) is 1.5 mm, which is about 4.3 times the thickness of the composite material (4). It is. FIG. 4 shows a state in which the overcap (B) is attached to the double-structured flange (6). 3 and 4, (31) is an aluminum lid having a heat sealing material layer on the lower surface.

  Tapered cup-shaped container (A) having a vertically bent flange peripheral part (5a) in order to fold the flange peripheral part (5a) of the tapered cup-shaped container (A) downward into a double structure flange (6) ) Is employed in the first method.

  First, after forming a tapered cup-shaped container (A) having a horizontal flange (7) slightly larger than a predetermined width for obtaining a double-structured flange, a mold for edge cutting shown in FIGS. 5 and 6 ( Using C), the edge (7a) slightly larger than the predetermined width of the horizontal flange (7) is trimmed. The edge cutting mold (C) is movable up and down tightly fitted in a punch (8), a die (9), and a die (9) having an upper end peripheral edge equal to the peripheral edge of a horizontal flange having a predetermined width before turning back. A cylindrical flange holder (10) with a top wall and a vertical bar-shaped container holder (11) that passes through the top wall of the flange holder (10) and can be moved up and down. An annular projecting portion (15) is provided that is closely fitted in the circular hole (13) of the upper die set (12) and is received by the spring (14).

  This edge cutting mold (C) is used as follows. First, place the cup-shaped container (A) on the punch (8) in the opposite direction and place the cup-shaped container (A) in the opposite direction, lower the container holder (11), and punch the bottom of the cup-shaped container (A) from above (8). Hold it so that it does not move. A portion (7a) slightly larger than the predetermined width of the horizontal flange (7) of the cup-shaped container (A) protrudes from the circular edge of the punch (8). Next, both the die (9) and the flange presser (10) are lowered, the horizontal flange (7) is pressed against the punch (8), and the die (9) around the flange presser (10) is further lowered, As a result, a portion (7a) slightly larger than the predetermined width of the horizontal flange (7) protruding from the circular edge of the punch (8) is trimmed to form a horizontal flange (5) having a predetermined width. At this time, the flange presser (10) compresses the spring (14), and the horizontal flange (5) having a predetermined width is held on the punch (8) by the spring force.

  Next, the horizontal flange (5) having a predetermined width is bent vertically using the vertical bending mold (D) shown in FIGS. The vertical bending mold (D) is closely fitted into the die (16) and the die (16) so as to be movable up and down, the lower end is received by the gas spring (17), and the double structure flange (6) A flange presser (18) having an upper peripheral edge equal to the peripheral edge, a cylindrical punch (19) with a top wall, and a vertical bar-shaped container presser (20) that passes through the top wall of the punch (19) and can be vertically adjusted; The outer diameter of the tip of the punch (19) is smaller than the inner diameter of the tip of the die (16) by the thickness of the horizontal flange (5), and the inner diameter of the tip is substantially equal to the outer diameter of the mouth of the cup-shaped container (A).

  This vertical bending mold (D) is used as follows. First, place the cup-shaped container (A) on the flange retainer (18) so that it is centered on the flange retainer (18) in the opposite direction, lower the container retainer (20), and press the bottom of the cup-shaped container (A) from the top with the flange retainer ( Press down so that it does not move to 18). A portion larger than the width of the double-structured flange (6) of the cup-shaped container (A) protrudes from the circular edge of the flange retainer (18) and rests on the upper end surface of the die (16). Next, the punch (19) is lowered, and its tip is pushed into the die (16) by pushing down the flange holder (18) against the spring force of the gas spring (17). The peripheral edge (5a) of the horizontal flange (5) having a predetermined width protruding from the circular edge is first bent vertically.

The peripheral edge (5a) of the vertical bending flange obtained as described above is bent in an inwardly inclined shape using an inwardly inclined bending mold (E) shown in FIGS. The inwardly inclined bending mold (E) includes a punch (20) having an upper end periphery having a diameter substantially equal to the periphery of the double structure flange (6), a cylindrical die (21) with a top wall, and a die (21 ) And a vertical bar-shaped container holder (22) that can be adjusted up and down. The inner peripheral surface of the tip of the cylindrical die (21) has a relatively slanted surface from the bottom to the top. (23) A vertical surface (24) having an inner diameter substantially equal to the diameter of the tip of the punch (19) and a relatively steep inclined surface (25) are formed. As a specific inclination angle, the angle (θ ₁ ) of the gentle inclined surface (23) is selected from a range of 3 to 15 ° with respect to the vertical surface (24), but here it is 10 °. If it is less than 3 °, the peripheral edge (5a) of the vertical bending flange is not smoothly guided to the vertical surface (24), and if it exceeds 15 °, it strikes the inclined surface (23) and this is not smoothly guided. Preferably, it is 7 to 10 °. The angle (θ ₂ ) of the steeply inclined surface (25) is selected from the range of 20 to 60 °, and here it is 45 °. If the angle is less than 20 °, the bending process becomes severe, and the peripheral edge of the vertical bending flange (5a) may be damaged. . Preferably, it is 30-50 degrees. Above the steeply inclined surface (25) is the inner peripheral surface of the die (21) that is equal to the outer peripheral surface of the mouth of the cup-shaped container (A) via the horizontal surface (26) that follows.

  This inwardly inclined bending mold (E) is used as follows. First, place the cup-shaped container (A) on the punch (20) in the opposite direction, place the cup-shaped container (A) in the opposite direction, lower the container holder (22), and punch the bottom of the cup-shaped container (A) from above (20). Hold it so that it does not move. In this case, the outer peripheral surface of the peripheral edge (5a) of the vertical folding flange of the cup-shaped container (A) is substantially on the same vertical surface as the outer peripheral surface of the tip of the punch (20).

  Next, when the punch (22) is lowered and its tip end enters the lowered vertical surface (24) of the die (21), the vertical bent flange peripheral edge (5a) continues on the vertical surface (24). It is squeezed by the steeply inclined surface (25) and bends inwardly along this.

  The inner inclined bent flange peripheral edge (5a) is pressed using a pressing mold (F) shown in FIGS. 11 and 12, and the flange base (5b) forms a double structure flange (6). . The pressing mold (F) includes a punch (27) having an upper peripheral edge larger in diameter than the peripheral edge of the double structure flange (6), a cylindrical die (28) with a top wall, and a top wall of the die (28). It consists of a vertical rod holder (29) that penetrates and can be moved up and down, and the inner peripheral surface of the tip of the cylindrical die (28) has a height (H) that is lower than the vertical height of the double structure flange (6) And a downward stepped portion (30) having a width slightly larger than the peripheral edge of the double-structure flange (6) is formed, and the lower surface of the die (28) during pressurization and the punch (27 ) So that a clearance (S) of 0.2 mm is generated.

  The downward step (30) has a height lower than the vertical height of the double structure flange (6) and slightly larger than the peripheral edge of the double structure flange (6). By ensuring the roundness with no variation in the outer diameter, the overcap can be securely attached and between the lower surface of the die (28) and the upper surface of the punch (27) during pressurization. This is because the inwardly inclined flange peripheral edge (5a) can be sufficiently pressurized even if there is a gap. The reason why the gap (S) is generated between the lower surface of the die and the upper surface of the punch (27) at the time of pressurization is that the die (28) and the punch (27) are prevented from contacting and being damaged. It is. The total of the gap (S) and the height (H) of the stepped portion (30) is selected from a range of 2 to 5 times the thickness of the composite material (4). Because the sum of the gap (S) and the height (H) of the step (30) is less than twice the thickness of the composite material (4), the upper and lower layers of the double-structured flange (6) Since there is no gap and the thickness of the composite material (4) is less than the thickness of the composite material (4) itself, there is a risk of material cracking in the flat part or the folded peripheral edge part (5b) of the flange base part (5a). Since the folded flange periphery (5b) is in an unnecessary standing state, when the lid (31) is heat-sealed to the flange base (5a), the pressure is not uniform and the seal is poor. When the overcap (8) is hooked on the flange (6) having a double structure, the inclination angle of the transverse section of the flange peripheral part (5b) folded back is too large. This is because it causes a mounting failure.

  This press-molding mold (F) is used as follows. First, place the cup-shaped container (A) on the punch (27) in the opposite direction and place the cup-shaped container (A) in the opposite direction, lower the container presser (29), and punch the bottom of the cup-shaped container (A) from above (27). Hold it so that it does not move. Next, the die (28) is lowered, and the inwardly inclined bent flange peripheral portion (5a) of the cup-shaped container (A) is put into the downward step (30) of the die (28), and this is inserted. When pressure is applied toward the flange base (5b) with the horizontal surface of the downward step (30), a double-structured flange (6) is obtained with the flange base (5b). When this cup-shaped container (A) is taken out from the pressing mold (F), it becomes a container for sealing beverages, foods and the like according to the present invention.

It is the top view which notched a part of sealing containers, such as a drink and foodstuff, by this invention. It is the front view which notched a part of container of FIG. It is a principal part expansion detailed longitudinal cross-sectional view of the container of FIG. FIG. 2 is a partially enlarged longitudinal sectional view of the container of FIG. 1 showing a state in which an overcap is hooked and attached to a flange. It is a longitudinal cross-sectional view of the edge cutting molding die. FIG. 6 is an enlarged vertical cross-sectional view of a main part of the edge cutting mold shown in FIG. 5, showing a state in which the flange has been edge cut. It is a longitudinal cross-sectional view of the vertical bending molding die. FIG. 8 is an enlarged vertical cross-sectional view of a main part of the vertical bending mold shown in FIG. 7 showing a state where the flange is bent vertically. It is a longitudinal cross-sectional view of the inward inclined bending mold. FIG. 10 is an enlarged vertical sectional view of a main part of the inwardly inclined bending mold shown in FIG. 9 showing a state where the flange is bent inwardly. It is a longitudinal cross-sectional view of the press-molding mold. FIG. 12 is an enlarged vertical cross-sectional view of a main part of the press-molding mold of FIG. 11, showing a state where a peripheral edge portion of the inwardly inclined bent flange is pressed toward the flange base portion to form a double-structure flange flange.

Explanation of symbols

(1) Aluminum foil core layer
(2) (3) Synthetic resin coating layer (unstretched polypropylene coating layer)
(4) Composite material (5) Flange (5a) Peripheral edge of flange (5b) Flange base (6) Double structure flange (A) Tapered cup-shaped container (L ₁ ) (L ₂ ) Folded from top of flange base Vertical distance to the bottom edge of the flange edge

Claims (4)

  A tapered cup-shaped container is formed of a composite material composed of an aluminum foil core layer and a synthetic resin coating layer formed on both sides thereof, and a flange peripheral portion is folded downward to form a flange base portion. A container for sealing beverages and foods, etc., which has a double structure.   The container for sealing beverages and foods according to claim 1, wherein the composite material has a thickness of 0.1 to 0.8 mm.   The container for sealing beverages, foods, etc. according to claim 1, wherein the flange peripheral portion folded back is not less than 1/3 of the width of the flange lower surface before it is folded back and the length just reaching the outer peripheral surface of the container.   The container for sealing beverages, foods and the like according to claim 1, wherein the vertical distance from the upper surface of the flange base portion to the lower edge of the flange peripheral edge that is folded back is 2 to 5 times the thickness of the composite material.

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