Patent Description:
Currently, the metal food cans are sealed in a manner of double seaming, whether they are two-piece cans or three-piece cans, or their lids are easy- open lids, easy-peel-off lids, or common lids. Therefore, the strength of the can bodies can be increased to ensure that the contents would not be contaminated by secondary pollution. However, there are some disadvantages as described below in the manner of double seaming for sealing: the sealing machines are complicated and difficult to be adjusted, so skilled technicians are required to operate them, and metal lids and cover rings are needed when sealing, which result in high production cost of metal cans; it is easy to cut consumer's fingers during opening the sealing.

<CIT> discloses an easy-open container, such as a metal can, that has a rim with an integral heat seal zone and a heat sealable powder or hot melt coating applied to the heat seal zone of the upper rim.

<CIT> discloses a shoulder formed from the side wall so that it can be sealed with the lid in air and liquid-tight manner. So that the food can be preserved for long periods no air bubbles are to form, so the container is filled to excess before sealing and excess food squeezed out when the stamp of the sealing device is applied. To keep the stamp clean the outer edge of the container shoulder is rolled in towards the plastics coated inside of the metal foill in the same way as the outer edge of the lid, with the rolled edge of the lid being forced out of the plane of the inside of the lid and the sealing surface of the shoulder. The rolled edge of the lid thereby has the same diameter as the rolled edge of the shoulder and when sealing these two edges together a protective wall is formed which keeps the excess food away from the stamp which supports the shoulder during the sealing process and away from the sealing stamp itself.

<CIT> discloses a polyester film connected to an aluminum foil through laminate adhesive. The aluminum foil has thickness of <NUM>-<NUM> mu m. The polyester film has thickness of <NUM>-<NUM> mu m. This document shows also a container made from said laminate with the aluminum foil as exterior layer and the polyester film as interior layer, wherein the container has a bottom, sidewall extending from the bottom, a ring shaped sealing area and a multi-layered lid sealed onto the sealing area.

<CIT> discloses a package comprising a flanged container body and lid which has a heat sealing area laterally within co-operating rolled portions. The lid and body are heat sealed by thermoplastic linings e.g. one of which is polyethylene and the other polypropylene. The body and lid may be of aluminum foil and a pull tab may be incorporated.

Accordingly, it is necessary to provide a laminated food easy-peel-off can, which can reduce the production cost of the metal food can, and can be opened easily and safely.

The invention provides a laminated food easy-peel-off can as defined in claim <NUM>. Its technical solutions are as follows:
A laminated food easy-peel-off can comprises a can body drawn from a laminated metal sheet and a lid drawn from a laminated metal sheet. The can body comprises a cavity having an opening, and an annular bonding body located around an edge of the opening. The lid is thermally bonded and sealed to the annular bonding body.

When using the above-mentioned laminated food easy-peel-off can to package food, the food to be packaged is firstly placed into the cavity of the can body, then the can body is covered by the lid, and then a laminated film of the lid and a laminated film of a upper surface of the annular bonding body are bonded together by thermally pressing technology, such that the lid seals the cavity so as to seal and preserve the food. At the same time, the surface of the can body is covered by a laminated film, which can prevent the food from contacting the metal of the can body, thereby avoiding the corrosion and damage to the can body and wasting food. When the preserved food needs to be taken out, the lid can be separated from the annular bonding body by simply peeling off the lid, and then the food can be taken out from the cavity. The sealing of the above-mentioned laminated food easy-peel-off can is able to obtain a tight sealing by bonding the lid to the annular bonding body by heating and pressing, which makes the sealing machine simple and easy to be used, and easy to be operated. Compared with the easy-peel-off lid, the cover ring is omitted, and the production cost of the metal food can is greatly reduced. At the same time, this sealing design can meet the sealing requirements of the metal can bodies in various different shapes, and meet the individual design requirements.

The lid is thermally bonded and sealed to the annular bonding body, and the lid and the annular bonding body can cooperatively form a sealed storage chamber with the cavity.

In one embodiment, a temperature at which the lid and the annular bonding body are thermally bonded and sealed is <NUM>° to <NUM>°.

An adhesive force of the thermal bonding between an edge of the lid and the annular bonding body is greater than or equal to <NUM> kpa.

In one embodiment, an edge of the annular bonding body is provided with a smooth transitional scratch-resistant portion.

In one embodiment, the scratch-resistant portion is curled in a direction toward the cavity or away from the cavity, and forms an annular protrusion.

In one embodiment, the cross section of the annular protrusion is in a circular shape.

In one embodiment, the lid is provided with an opening portion located outside a thermally bonded position between the lid and the annular bonding body.

In one embodiment, the annular bonding body and the cavity are perpendicular or approximately perpendicular to each other in a same cross section.

<NUM>, can body. <NUM>, cavity. <NUM>, opening. <NUM>, annular bonding body. <NUM>, first laminated film. <NUM>, scratch-resistant portion. <NUM>, lid. <NUM>, opening portion. <NUM>, second laminated film.

In order to make the objects, technical solutions and advantages of the present disclosure more clear, the present disclosure will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

It should be noted that the "can body" is made from a laminated metal sheet. The laminated metal sheet is formed by attaching a plastic film to a metal sheet by thermally pressing at a high temperature. For example, a PET, PC, PE or PP film is attached to the metal sheet (such as a cold rolled plate), "thermally bonded" means bonding by heating and pressing.

Unless otherwise specified, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs. The terms used herein is for the purpose of describing embodiments only and is not intended to limit the present disclosure.

The terms "first" and "second" in the present disclosure do not represent a specific number and order, but are merely used for distinguishing names.

As shown in <FIG>, a laminated food easy-peel-off can according to the present disclosure comprises a can body <NUM> drawn from a laminated metal sheet and a lid <NUM> made of a laminated material. The can body <NUM> comprises a cavity <NUM> having an opening <NUM>, and an annular bonding body <NUM> located around an edge of the opening <NUM>. The lid <NUM> is thermally bonded and sealed to the annular bonding body <NUM>.

As shown in <FIG>, When using this laminated food easy-peel-off to package food, the food to be packaged is firstly placed into the cavity <NUM> of the can body <NUM>, then the can body is covered by the lid <NUM>, and then a laminated film of the lid <NUM> and a laminated film of a upper surface of the annular bonding body <NUM> are bonded together by thermally pressing technology, such that the lid <NUM> seals the cavity <NUM> so as to seal and preserve the food. At the same time, the surface of the can body <NUM> is covered by a laminated film, which can prevent the food from contacting the metal of the can body <NUM>, thereby avoiding the corrosion and damage to the can body <NUM> and wasting food. When the preserved food needs to be taken out, the lid <NUM> can be separated from the annular bonding body <NUM> by simply peeling off the lid <NUM>, and then the food can be taken out from the cavity <NUM>. The sealing of the above-mentioned laminated food easy-peel-off can is able to obtain a tight sealing by bonding the lid <NUM> to the annular bonding body <NUM> by heating and pressing, which makes the sealing machine simple and easy to be used, and easy to be operated. Compared with the easy-peel-off lid, the cover ring is omitted, and the production cost of the conventional metal food can is greatly reduced. At the same time, this sealing design can meet the sealing requirements of the can bodies <NUM> in various different shapes, and meet the individual design requirements.

As shown in <FIG>, in this embodiment, the lid <NUM> is thermally bonded and sealed to the annular bonding body <NUM>, and the lid <NUM> and the annular bonding body <NUM> cooperatively form a sealed storage chamber with the cavity. A tight sealing is formed by thermally pressing and bonding technology, which is convenient to form the storage chamber for sealing and storing food and is convenient to preserve food. Preferably, in order to obtain a better adhesive force, a temperature at which the lid and the annular bonding body are thermally bonded and sealed is <NUM>° to <NUM>°. Furthermore, the adhesive force of the thermally bonding between the edge of the lid <NUM> and the annular bonding body <NUM> is greater than or equal to <NUM> kpa. That is, after being subjected to a pressure of <NUM> kpa, the sealing between the edge of the lid <NUM> and the annular bonding body <NUM> are still reliably. Therefore, it can be used for preserving liquid food. It has temperature resistance and pressure resistance, thus it can meet the requirements of high pressure sterilization of canned food. The laminated food easy-peel-off can according to the present disclosure is subjected to a pressure test after being cooked at a high temperature of <NUM>° C, and has no leakage at a pressure of <NUM> kpa. The lid <NUM> is made of laminated material, preferably, it is made of laminated plastic film having good plasticity and good weldability, such as an aluminum- plastic lamination, a multi-layer plastic lamination, etc..

As shown in <FIG>, preferably, the outer edge of the opening <NUM> is used to secure the annular bonding body <NUM>. Therefore, the sealing machine is further simplified, and it is more convenient to realize the thermally bonding and sealing between the annular bonding body <NUM> and the lid <NUM>. Further, the annular bonding body <NUM> is provided with a first laminated film <NUM>, the lid <NUM> is provided with a second laminated film <NUM>, and the lid <NUM> is bonded and sealed to the annular bonding body <NUM> by thermal bonding between the second laminated film <NUM> and the first laminated film <NUM>. The tight sealing is formed by thermally bonding between the second laminated film <NUM> and the first laminated film <NUM>, thereby improving the adhesive force between the lid <NUM> and the annular bonding body <NUM>. Furthermore, the annular bonding body <NUM> and the cavity <NUM> are perpendicular or approximately perpendicular to each other in the same cross-section, so as to facilitate fixing the annular bonding body <NUM> on the sealing machine and thermally bonding the annular bonding body <NUM> to the lid <NUM>, and the cavity <NUM> can be sealed by using a simple sealing machine, which can further reduce the production cost of the metal food can. At the same time, it can prevent that the bonding position between the annular bonding body <NUM> and the lid <NUM> is stable and flat, and the lid <NUM> is prevented from being subjected to an additional pulling force. At the same time, a smooth transitional portion is provided between the annular bonding body <NUM> and the cavity <NUM>, so that the protrusion or acute angle can be avoided, which may result in an unstable bonding between the lid <NUM> and the annular bonding body <NUM>. Preferably, the cavity is integrally drawn with the annular bonding body.

As shown in <FIG>, in this embodiment, an edge of the annular bonding body <NUM> is provided with a smooth transitional scratch-resistant portion <NUM>. Therefore, it is possible to prevent the edge of the annular bonding body <NUM> from cutting the consumer's fingers. Further, the scratch-resistant portion <NUM> is curled in a direction toward the cavity <NUM> or away from the cavity <NUM>, and forms an annular protrusion. Therefore, the edge notch of the annular bonding body <NUM> can be curled inwardly to avoid cutting the fingers due to its exposure. At the same time, the annular protrusion is formed, which is convenient for people to carry and take the can body <NUM> (for example, after being cooked at a high temperature, the can body <NUM> can be taken out from the heating position by person holding the annular bonding body <NUM>). Furthermore, the cross-section of the annular protrusion is in a circular shape, so that only the curling process is required to form the scratch-resistant portion <NUM> during the outer edge processing of the annular bonding body <NUM>.

As shown in <FIG>, <FIG> or <FIG>, in this embodiment, the lid <NUM> is provided with an opening portion <NUM>, which is located outside a thermally bonded position between the lid <NUM> and the annular bonding body <NUM>. It is convenient for people to peel off the lid <NUM>.

In this embodiment, the can body <NUM> is a laminated iron can body, and the lid <NUM> is an aluminum plastic laminated lid or a multi-layer plastic laminated lid. Therefore, the can body <NUM> has sufficient rigidity, the lid <NUM> has sufficient ductility, and the two are matched to obtain an optimum effect.

Claim 1:
A laminated food easy-peel-off can, comprising a can body (<NUM>) made of a thermally laminated metal sheet and a lid (<NUM>) made of a laminated material, the can body (<NUM>) comprising a cavity (<NUM>) having an opening (<NUM>), and an annular bonding body (<NUM>) located around an edge of the opening (<NUM>), wherein
the can body (<NUM>) is a laminated iron can body made from a laminated iron sheet comprising an iron sheet and a plastic film thermally laminated on the iron sheet, the iron sheet and plastic film being thermally laminated together by heating and pressing, while the lid (<NUM>) is an aluminum plastic laminated lid or a multi-layer plastic laminated lid, and the lid (<NUM>) is provided with a laminated film (<NUM>), the lid (<NUM>) is bonded and sealed to the annular bonding body (<NUM>) by directly thermal bonding the laminated film (<NUM>) to the plastic film (<NUM>);
an adhering force of the thermal bonding between an edge of the lid (<NUM>) and the annular bonding body (<NUM>) is greater than or equal to <NUM> kpa.