MXPA97006409A - Procedure for closing and sealing hermetically a fund of a contene - Google Patents

Abstract

The present invention relates to a method for sealing a bottom of a container comprising the steps of: providing a cylindrical container body having a lower surface sealable by heat and an open lower end, forming a flange on, and around the lower end of the cylindrical body of the container extending outwardly from the body of the container in a sharp radius of about 90 ° towards an external surface of the body of the container and defining a flat circular surface sealable by heat on an outer side of the flange; Place a generally circular membrane patch that has a heat-sealable bottom surface on the flat, heat-sealable circular surface of the container body flange to cover the open bottom end of the container body, heat sealing the sealable surfaces with heat from the tab of the body of the container and the patch of The invention relates to a method for sealing the lower end of the container, said method being characterized in that it additionally comprises the step of: crimping the flange of the body of the container and the portion of the membrane patch, sealed thereto with heat, towards the container. inside the cylindrical body of the container, while applying heat and pressure to complete the closure of the bottom of the container and to maintain the cylindrical shape of the container

Description

PROCEDURE TO CLOSE AND SEAL HERHETICOMENTE A FUND OF A CONTAINER FIELD OF THE INVENTION This invention is directed to a process for sealing and hermetically sealing a bottom of a container that preferably includes a mixed container body and that is adapted to contain food products and the like.

BACKGROUND OF THE INVENTION Containers of this type are frequently used to pack food products or the like, including dried potato slices, powdered products, bread crumbs, ice cream and the like. These containers can be closed at the top thereof by means of a removable membrane that seals the interior of the container and can include a top cover that can be peeled off and placed back on the container. It is convenient to close the bottom of these types of containers with a simple hermetic seal that is easy to install and provides an effective seal. Although many different constructions of lower closures have been provided on these types of containers, the problems with these closures and with the hermetic seal have prevailed. There are also resistance problems in these lower closures.

BRIEF DESCRIPTION OF THE INVENTION Therefore, an object of this invention is to provide a method for sealing and hermetically sealing a bottom of a container that improves the procedures used up to now and provides an effective hermetic seal. A further object of this invention is to provide said method which also provides an element to reinforce the closure of the bottom. By means of this invention, it has been found that the above objects can be achieved by providing a method for sealing and hermetically sealing a bottom of a container that generally includes the following steps. A cylindrical container body having an inner surface sealable by heat and an open lower end is provided. A flange is formed, and around, the bottom end of the cylindrical body of the container extending extemporaneously from the body of the container at a sharp radius of about 30 ° to an exterior surface of the body of the container and defining a flat surface circular sealable by heat on the outer side-of the flange. A generally circular membrane patch having an inner surface sealable by heat is placed on the flat, heat-sealable circular surface of the flange of the body of the container to cover the open lower end of the body of the container. The heat-stable surfaces of the container flange and the membrane patch are sealed together by means of heat to seal the bottom end of the container. The flange of the body of the container and the portion of the membrane patch, sealed to it with heat, are rippled into the cylindrical body of the container while applying heat and pressure to complete the closure of the bottom of the container and the sealing of the container. and to maintain the cylindrical shape of the fork. ,? If additional strength is desired in the lower closure of the self-sealing sealed container, the method may include an additional step of placing a generally circular reinforcing plug over the membrane patch before the corrugation step, and then corrugation of the body flange of the membrane. container and the portion of the membrane patch, heat-sealed thereto, into the body of the cylindrical container and over an outer periphery of the reinforcing plug, while applying heat and pressure to complete the closure of the container and to re-have the cylindrical shape of the container. Preferably, the circular reinforcing plug includes a flange around the outer periphery thereof which extends away from an outer surface of the reinforcing plug at an angle of approximately 90 °, so that the flange of the container body and the membrane patch can be undulated on the flange of the reinforcing plug. Some of the objects and advantages of this invention have been previously; other objects and advantages will become apparent in the following detailed description of this invention when taken in conjunction with the accompanying drawings, in which: Figure 1 is a perspective view of a container constructed in accordance with this invention and in which separate the components of the upper closure of the container; Figure 2 is a sectional view in a non-separate form and taken generally along line 2-2 of row 1; Figure 3 is a perspective view of the container shown in Figure 1, but without the top closure components, and inverted with the bottom placed on the top and before closing and hermetically sealing the bottom in accordance with the procedure of this invention; Figure 4 is a partial perspective view of the lower end of the container after the process of forming a flange on and around the lower extrusion of the body of the container has been effected; Figure 5 is a partial perspective view of the lower end of the body of the container, as in Figure 4, and after a generally circular membrane patch has been placed on the flat surface of the flange of the body of the container; Figure 6 is a sectional view, taken generally along the line d-6 of Figure 5, and illustrating the flange of the body of the container and the portion of the membrane patch, sealed to the isma with heat, just before being waved inward; Figure 7 is a sectional view, like Figure 6, illustrating the corrugation of the flange of the container body and the membrane patch; Figure BA is a partial perspective view, like Figure 5, and illustrates a further preferred step of the method of placing a generally circular reinforcing plug on the membrane patch before corrugation; Fig. 8B is a partial perspective view, like Fig. 8A, illustrating an intermediate phase of corrugation of the flange of the body of the container and the portion of the membrane patch, sealed therewith with heat, towards the interior of the cylindrical container and on the outer periphery of the reinforcing plug; Figure 8C is a partial perspective view, like Figure 8B, illustrating the final step of the corrugation process step; and Figures 9A, 9B and 9C are sectional views taken along lines 9A, 9B and 9C, respectively, of Figures 8A, BB and 8C and illustrating also the process steps illustrated therein.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES OF THE INVENTION Referring now to the drawings, Figures 1 and 2 illustrate a container, indicated generally at 10, which is constructed in accordance with the method of this invention. This container 10 comprises a generally cylindrical container body portion 11 which can be constructed of any suitable material and which preferably is of a mixed material construction and can be wound spirally, wound on itself or otherwise formed. The body of the container 11 is preferably of a mixed construction that includes a convenient combination of layers that may include a paper label layer, paper body folds and a suitable liner layer. The mixed container 11 includes a heat-sealable interior surface 12 which can be formed of any suitable material including polyethylene polymers that can be formed as an inner liner or fold of the liner layer which can also include paper folds and thin sheet. The container 10 also includes a top closure, indicated generally at 14. This top closure may be any convenient type of top closure conventionally used, including a membrane 15 constructed of any suitable material including a mixture of suitable paper, thin sheet and / or polyethylene polymers, heat-sealed to the heat-sealable interior surface 12 of the container body-10 at the upper end of the container 11 that has been corrugated to the outside (as shown in Figure 2) to locate the inner surface sellahle by heat-12 in the upper part of the container 11. A suitable upper lid 15 can also be provided and constructed of any suitable rnatepal, such as density polyethylene, constructed in such a way that it can open and close by jump the former upper oar of container 11, tan-to before having retired the membrane seal 15, as after having withdrawn the sel the membrane 15, to have access to the interior of the container 11. The container 10 also includes a lower closure, generally designated at 20, which is constructed in accordance with the method of this invention and which seals the lower end of the container. container 10. In accordance with this invention, the lower closure 20 of the container 10 is effected by the following process steps. A flange 22 is formed on, and around, the lower end of the body of the cylindrical container 11 (the lower end of the body of the container 11 is shown as the upper end in Figures 3-9 since the method of sealing her by sealing the container is preferably effected with the body of the converted container). This flange 22 extends outwardly from the body of the container 11 at an acute radius of about 90 ° towards an external surface of the body of the container 11 and which defines a circular flat surface sealable by heat 12 on an outer side of the flange 22 (co or is shown particularly in Figures 4 and 6). A generally circular membrane patch 24 having a heat sealable interior surface is placed on the circular heat-sealable flat surface 12 of the container body flange 22 to cover the open lower extrusion of the container body 11. The patch Membrane 24 can be constructed of any suitable material, including a mixture of convenient paper pleats, thin foil and / or polyethylene polymers. Then, the membrane patch 24 is heat sealed to the heat-sealable surface 12 of the container body flange 22 to seal the lower end of the container tightly. The heat sealing of the membrane patch 24 to a flange of the body of the container 22 that is placed in a generally flat condition, and obtained through the 90 ° orientation, produces a superior hermetic seal. Then, the flange of the body of the container 22 and the portion of the membrane patch, sealed thereto by heat, are corrugated towards the interior of the body of the container 11 (as shown in Figures 5 and 7) while applying heat - and pressure to complete the closure of the bottom 20 and to maintain the cylindrical shape of the container 10. If it is desired to reinforce the closure of the bottom 20 of the container 10, the procedure for closing and hermetically sealing the bottom can also include the placement of a tap. n generally circular reinforcement 26 (as shown in Figures 8A and 9A) on the membrane patch 24. This circular reinforcing plug 25 preferably includes a flange 27 around the outer periphery thereof and extending away from a external surface of the plug of the reinforcement 26 at an angle of approximately 90 ° (as shown in Figures 8A and 9B in particular). This reinforcing plug 26 can be formed of any suitable material including low density polyethylene. Then, the flange of the body of the container 22 and the portion of the patch of honeycomb 24, sealed thereto with heat, are corrugated towards the interior of the body of the container 11 and on an outer periphery of the plug of the reinforcement 26 and its flange 27 (as shown in Figures 8B, 9B, 8C and 9C), while applying heat and pressure to complete the formation of the lower closure 20 of the container 10 and to maintain the cylindrical shape of the container 10. In the drawings and the specification has set out preferred embodiments of the invention and, although specific terms are used, the terms are used in a generic and descriptive sense only and not for the purpose of limitation; the scope of the invention is indicated in the following claims.

Claims (8)

NOVELTY OF THE INVENTION CLAIMS

1. - The method for sealing and sealing a bottom of a container comprising: providing a cylindrical container body having an interior surface sealable by heat and an open bottom extrusion; forming a flange on, and around, the lower end of the cylindrical body of the container extending out of the body of the container at a sharp radius of approximately 90"toward an external surface of the container body and defining a circular flat surface heat-sealable on an outer side of the flange; placing a generally circular membrane patch, having an inner surface sealable by heat, on the flat, heat-sealable circular surface of the flange of the container body to cover the open lower end of the body of the container, mutually sealing the heat sealable surfaces of the flange of the body of the container and the membrane patch to hermetically seal the lower end of the container, and corrugation the container body flange and the portion of the container. membrane membrane, sealed to it with heat, towards the inside of the cylindrical body of the co ntenedor, applying at the same time heat and pressure to complete the closure of the bottom of the container and to maintain the cylindrical shape of the container.

2. The method for sealing and hermetically sealing a bottom of a container comprising: providing a cylindrical container body having an inner surface sealable by heat and an open lower end; forming a flange on, and around, the lower end of the cylindrical body of the container-which extends outwardly from the body of the container at a sharp radius of about 90 ° toward an external surface of the body of the container and which defines a circular flat surface heat-sealable on an external side of the flange; placing a generally circular membrane patch having an inner surface sealable by heat on the flat, heat-sealable circular surface of the container body flange to cover the open lower end of the body of the container; heat sealing the sealing surfaces between the heat of the flange of the body of the container and the membrane patch to seal the lower end of the container; placing a generally circular reinforcing plug over the membrane patch; and crimping the flange of the body of the container and the portion of the membrane patch, heat-sealed thereto, into the cylindrical body of the container and onto an outer periphery of the reinforcing plug, while applying heat and pressure to the container. complete the closure of the bottom of the container and to maintain the cylindrical shape of the container.

The method according to claim 1 or 2, further characterized in that said container body is constructed of a mixed body that includes a paper label layer, paper body folds and a liner layer, and in the which said heat sealable interior surface is constructed of polyethylene polymers.

4. The method according to claim 1 or 2, further characterized in that the membrane patch is constructed of a mixed body including paper folds, thin sheet and polyethylene polymers.

5. The method according to claim 2, further characterized in that said cap is constructed of density polyethylene.

6. The method according to claim 2, further characterized in that the generally circular reinforcing plug includes a flange around the outer periphery thereof extending away from an external surface of the reinforcing plug at an angle of approximately 90 °.

7. A cylindrical container having a closed bottom and hermetically sealed, produced in accordance with the method of claim 1.

8. - A cylindrical container having a closed bottom and hermetically sealed, produced in accordance with the procedure of claim 2. SUMMARY OF THE INVENTION A method is provided to close and hermetically seal a bottom of a container; a cylindrical container body having an internal surface sealable by heat and an open lower end is provided; a flange is formed on, and around, the lower end of the cylindrical body of the container, which extends outwardly from the body of the container at a sharp radius of about 90 ° toward an external surface of the body of the container and defines a flat circular surface sealable by heat on an external side of the flange; a generally circular membrane patch, having an inner surface sealed therethrough by heat, is placed on the flat, heat sealable circular surface of the container body flange, covering the open lower end of the body of the container; the heat-sealable surfaces of the flange of the container body and the membrane patch are mutually sealed by means of heat to hermetically seal the lower end of the container; if additional strength is desired in the lower closure of the container, a circular reinforcing plug, preferably with an upwardly extending flange, is placed on the membrane patch; then, the flange of the body of the container and the membrane patch, sealed thereto with heat, are crimped towards the interior of the body of the container and on an outer periphery of the reinforcing plug, applying to the. At the same time heat and pressure to complete the closure of the body of the container and to maintain the container's indian shape. EA / lprn * blrn P97 / 799