Title of Invention

LID WITH SEALING FOIL COMPRISING RETAINING MEANS AND METHOD OF MANUFACTURING THE SAME .

Abstract

A lid (1) for a can for foodstuff, paint or similar, which lid comprises: a ring like base part (2) defining an opening (3), a sealing foil (4) arranged on the base part and covering the opening, said foil comprising a peripheral tab (5) for tearing the foil, arranged with its free end folded back onto the surface of the foil; retaining means (6) for retaining said free and of said tab adjacent the sealing foil, characterized in that the retaining means comprises a first retaining part being formed in the sealing foil and a second retaining part being formed in the tab, adjacent its free end.

Full Text

FIELD OF THE INVENTION: The invention relates to a lid with sealing foil for a can for foodstuff, paint and so on, which lid comprises : a ringlike base part defining an opening; a sealing foil arranged on the base part and covering the opening; a lip arranged with one end to the foil for tearing the foil; and retaining means for retaining a free end of the lip adjacent the sealing foil. PRIOR ART AND BACKGROUND: US Patent 5,797,509 is incorporated in this description by way of reference. The novel, inventive and advantageous feature of the present invention over US 5,797,509 is that sealing with adhesive and its heat treatment has been dispensed with in the present invention. Also, seal is tamper proof. Such a lid is used for cans, which comprise for example milk powder. These cans are filled under low pressure, such that the sealing foil of the lid will bend inside which causes the lip to bend up from the sealing foil. This causes problems during the further handling of such a can. The lip could get stuck between parts of a handling machine or influence the functioning of the machine. Such cans could also be sterilized. As a result of this, the sealing foil puffs up, by which again the lip bends away from the sealing foil. Currently, this bending of the lip is prevented by glueing the lip to the sealing foil. The glueing process has a number of disadvantages. First of all it is an expensive process, which is difficult to control. When the can is used for foodstuff, the flue has to be approved to be used for application in the food industry. Secondly the glue has to fulfil a number of requirements, such as a high temperature stability, especially when the lid is sterilized, a low tearing force, as the sealing foil has to be able to be removed easily. A third disadvantage of the glueing process is that the application of the glue has its speed limitation. The glue has always a rather high viscosity, which restricts the speed of application. OBJECT OF THE INVENTION It is an object of the invention to provide a lid according to the preamble, which eliminate the above mentioned disadvantages. This object is achieved by a lid according to the invention, which is characterized in that the retaining means comprise a first retaining part being part of the sealing foil and a second retaining part being part of the lip. DESCRIPTION OF THE INVENTION As both the first and second retaining part are part of respectively the sealing foil and the lip, no additional material has to be added in order to provide the retaining means. A robust connection of the lip to the sealing foil is provided. Tis prevents bending of the lip, which could influence further handling of the lid. According to a preferred embodiment the first and second retaining part have a shape defined connection. So due to the shape of both retaining parts, the connection is accomplished. There is no need for any frictional forces or adherents such as with a glue connection. According to another embodiment of the invention, the first and second retaining parts each comprise a projection which engage with each other. Preferably the projections have a substantially T-shaped cross-section. By this T-shaped cross-section, both the first and second retaining parts have a shape defined connection. The T-shape of the first part will engage into the T- shape of the other part. Only by deformation In a preferred embodiment of the method according to the invention the method comprises the step of stamping a profile into the sealing foil. This foil provides for a neat surface of the sealing foil, without any folds. Preferably the stamping, pressing and butting are performed in one stroke. This will provide a very quick way of nanufacturing a lid according to the invention. These and other features of the invention will be elucidated in conjunction with the accompanying drawings. Figure 1 shows an upper view of a lid according to the invention. Figure 2 shows a bottom ^iew of the lid according to :.igure 1. Figure 3 shows a sectional view of the lid according to :igure 1 taken along the line III-III. Fig ires 4A and 4B show two steps of a method according to ;he invention. Figures 5A and 5B show a cross-sectional view of the deformation accomplished with the steps according to figure 4A and figure 4B. In figures 1 and 2 a lie 1 according to the invention is shown. This lid comprises a ring-like base part 2 which defines an opening 3. A sealing foil 4 is arranged ontc the ring-like base part 2 covering the opening 3. The sealing foil 4 is ssealingly arranged to the base part 2. Integral with the sealing foil 4 a lip 5 is provided. This lip 5 is attached to the sealing foil 4 through a retaining means 6, which resembles a rivet. In figure 3 a cross-sectional view of the lid according to figure 1 is shown. Clearly can be seen that the ring-like base part 2 defines an opening 3 onto which the sealing foil 4 is arranged. The lip 5 is integral with the sealing foil 4 and folded back onto the sealing foil 4. The lip 5 and the sealing foil 4 are connected by retaining means 6, which consists of a first T-shaped protrusion 7 which is arranged in a second T-shaped protrusion 8. Due to the T-shape the retaining action is accomplished. In :igure 4A a tool 10 is shown with which a connection of a lip with a sealing foil can be achieved. The tool 10 has a lower die 11 and an upper die 12, On the upper die 12 a pressing member 13 is slidedly arranged and put under pressure by a spring 14. The sealing foil 4 and the lip 5 are brought onto the lower: die 11. The upper die 12 together with the pressing member 13 is brought down onto the sealing foil 4 and the lap 5. The pressing member 13 will contact the lip 5 first through which a protrusion is pressed into the materia;, of the foil and the lip (see figure 5A) . After this protrusion is formed into both the sealing foil 4 and the lip 5, the upper die 12 is brought down further with :orce, such that the bottoms 15. 16 of the protrusions are butted. This causes the material of the bottoms 15, 15 to flow, such that the thickness of the bottoms 15, 15 reduces, but that the area A increases. This provides a T-shaped protrusicn which connects both the sealing foil 4 and the lip 5. The lip can only be disconnected from the sealing foil 4 by deforming the material of the lip 5. As this deformation is visible, this lid according to the invention pro/ides also a tamper proof. We claim: 1. A lid (1) for a can for foodstuff, paint or similar, which lid comprises: - a ring like base part (2) defining an opening (3); - a sealing foil (4) arranged on the base part and covering the opening, said foil comprising - a peripheral tab (5) for tearing the foil, arranged with its free end folded back onto the surface of the foil; - retaining means (6) for retaining said free and of said tab adjacent the sealing foil, characterized in that the retaining means comprises a first retaining part being formed in the sealing foil and a second retaining part being formed in the tab, adjacent its free end. 2. A lid as claimed in claim 1, wherein the first and second retaining part have a shape defined connection. 3. A lid as claimed in claim 2, wherein the first and second retaining parts each comprise a projection which engage with each other. 4. A lid as claimed in claim 3, wherein the projections have a substantially T-shaped cross-section. 5. A lid as claimed in any of the preceding claims, wherein the tab and the sealing foil are integral. 6. A lid as claimed in any of the preceding claims, wherein the sealing foil comprises aluminum foil and/or steel foil. 7. Method for manufacturing a lid as claimed in any of the preceding claims, which method comprises the steps of: - providing a ringlike base part defining an opening; - cutting a sealing foil (4) out of a length of material; - providing a peripheral tab (5) on said foil whose free end is folded back onto the surface of the sealing foil; - associating the sealing foil with the base part; - pressing a recess with a bottom in both the sealing foil and the tab; - abutting the bottoms of the recesses, such that a connection is formed between the tab and the sealing foil. 8. Method as claimed in claim 7, comprising the step of stamping a profile . into the sealing foil. 9. Method as claimed in claim 8, wherein the stamping, pressing and butting are performed in one stroke. A lid (1) for a can for foodstuff, paint or similar, which lid comprises: a ring like base part (2) defining an opening (3), a sealing foil (4) arranged on the base part and covering the opening, said foil comprising a peripheral tab (5) for tearing the foil, arranged with its free end folded back onto the surface of the foil; retaining means (6) for retaining said free and of said tab adjacent the sealing foil, characterized in that the retaining means comprises a first retaining part being formed in the sealing foil and a second retaining part being formed in the tab, adjacent its free end.

Documents:

808-KOLNP-2004-FORM-27.pdf

808-kolnp-2004-granted-abstract.pdf

808-kolnp-2004-granted-claims.pdf

808-kolnp-2004-granted-correspondence.pdf

808-kolnp-2004-granted-description (complete).pdf

808-kolnp-2004-granted-drawings.pdf

808-kolnp-2004-granted-examination report.pdf

808-kolnp-2004-granted-form 1.pdf

808-kolnp-2004-granted-form 13.pdf

808-kolnp-2004-granted-form 18.pdf

808-kolnp-2004-granted-form 2.pdf

808-kolnp-2004-granted-form 26.pdf

808-kolnp-2004-granted-form 3.pdf

808-kolnp-2004-granted-form 5.pdf

808-kolnp-2004-granted-reply to examination report.pdf

808-kolnp-2004-granted-specification.pdf