Method for shrink-wrapping containers and articles obtained thereby

Information

  • Patent Grant
  • 6296129
  • Patent Number
    6,296,129
  • Date Filed
    Monday, September 16, 1996
    28 years ago
  • Date Issued
    Tuesday, October 2, 2001
    23 years ago
Abstract
The present invention relates to a method for wrapping a container having a neck portion and a body portion. The method uses a heat-shrinkable sleeve which has a perforation thereon. The sleeve is placed over the container, and heat is applied to the sleeve to cause the sleeve to shrink. The sleeve breaks at the perforation into a first and a second subsleeves which continue to shrink into snug surface engagement respectively with the neck portion and the body portion of the container. The present invention also relates to articles obtained by the method and the sleeve specifically designed for the method.
Description




1. BACKGROUND OF THE PRESENT INVENTION




1.1 Technical Field




The present invention relates to a method of wrapping containers, and articles obtained by such a method. More particularly, the present invention relates to a method for shrink-wrapping two portions of a container simultaneously by using a wrapping material having a perforation thereon.




1.2 Description of Related Art




Heat-shrinkable films have been widely used to wrap containers. When a heat-shrinkable film is applied onto the body portion of a container, it usually serves several purposes. First, the heat-shrinkable film can be a protective means for the container preventing potential damage caused in handling the container. Second, it can be used as a label having a trademark or specification of the product printed thereon. When a film is formed on the neck portion of the container, it can also serve as a sealing means. This is needed especially when the container's contents are volatile or oxygen-sensitive, such as food and certain pharmaceutical products.




Conventional processes for forming a body wrap or a neck wrap generally involve forming the heat-shrinkable film into a sleeve slightly larger in diameter than the dimension of the portion of the container to be wrapped, placing the sleeve over the container, and heating the sleeve to shrink it onto the container. Typical wrapping processes are disclosed in U.S. Pat. Nos. 4,013,496, 4,016,706, 4,983,238, and 5,240,529.




In such typical processes, only one of the body portion and the neck portion of the container are wrapped. If both the body wrap and the neck wrap are to be formed on the same container, one possible approach is to form the two wraps separately in a sequential manner. However, there is a problem that the earlier-formed wrap may be overheated as it would have to be exposed to the heat applied to shrink the wrap to be formed later. Efficiency of the procedures and ease of operation would also be an issue of concern. None of the above-mentioned patents recognized these problems inasmuch as they relate either to the formation of a body wrap or the formation of a neck wrap. Therefore, it would be highly desirable if the two wraps can be formed on the container simultaneously in the same procedure.




2. SUMMARY OF THE PRESENT INVENTION




Accordingly, it is an object of the present invention to provide an efficient method for forming two heat-shrinkable wraps, one on the minor portion and the other on the major portion of a container simultaneously in a single procedure.




Another object is to provide an article comprising a container having a wrap on its minor portion and a wrap on its major portion formed by said method.




Yet another object is to provide a heat-shrinkable sleeve suitable for simultaneously wrapping the minor portion and the major portion of a container in a single procedures.




These and other objects of the present invention as well as the advantages thereof will be apparent from the following description and claims.




The present invention provides a method for wrapping a container having a minor portion and a major portion.




According to the method of the present invention, a heat-shrinkable sleeve having a perforation thereon is provided. The perforation is positioned such that, upon breakage of the perforation, the sleeve will be separated into a first subsleeve and a second subsleeve. The first subsleeve is adapted to wrap the minor portion of the container and the second subsleeve is adapted to wrap the major portion of the container. The perforation should be capable of breaking upon heating at a temperature to be applied to shrink the sleeve.




The sleeve is placed over the container in such a manner that, upon breakage of the perforation, the first subsleeve will encircle the minor portion of the container and the second subsleeve will encircle the major portion of the container.




Next, heat is applied to the sleeve sufficiently to cause the perforation to break due to shrinkage of the sleeve. The resulted first subsleeve and second subsleeve continue to shrink until they are in snug surface engagement respectively with the minor portion and the major portion of the container.




The present invention also provides an article obtained by the above method. The article comprises in combination a container having a minor portion and a major portion, and a first subsleeve wrapping the minor portion and a second subsleeve wrapping the major portion. The first subsleeve and the second subsleeve were connected as an integral sleeve through a perforation before being applied onto the container.




The present invention further provides a wrapping sleeve suitable for use in the above method. Accordingly, the sleeve has a perforation thereon positioned such that upon breakage of the perforation, the sleeve will be separated into a first subsleeve and a second subsleeve. The first subsleeve is adapted to wrap the minor portion of the container and the second subsleeve is adapted to wrap the major portion of the container.




In a preferred embodiment of the present invention, the minor portion of the container is a neck portion and the major portion of the container is a body portion. Preferably, the neck portion and the body portion are cylindrical.




In another preferred embodiment of the present invention, the sleeve is made of a heat-shrinkable material.




In yet another preferred embodiment of the present invention, at least one of the first subsleeve and the second subsleeve is a preprinted label.




In still another preferred embodiment of the present invention, the container is a plastic bottle or a glass bottle.











3. BRIEF DESCRIPTION OF THE DRAWINGS





FIG. 1

shows a preferred embodiment of the article obtained according to the present invention.





FIG. 2

shows a preferred embodiment of the wrapping sleeve of the present invention.





FIG. 3

shows a preferred embodiment of the wrapping material of the present invention.





FIGS. 4A

,


4


B and


4


C show the steps for carrying out a preferred embodiment of the present invention.





FIG. 4A

shows a sleeve of the present invention before it is placed over a container.

FIG. 4B

shows the sleeve being placed over the container.

FIG. 4C

shows the sleeve breaking at a perforation and being separated into two subsleeves covering the neck portion and the body portion of the container.











4. DESCRIPTION OF THE PREFERRED EMBODIMENTS




Referring to

FIG. 1

, an article obtained according to the present invention is generally designated by numeral reference


10


. The article


10


consists of a container


9


having a neck portion


11


and a body portion


13


. A first subsleeve


3


is adapted to wrap around the neck portion


11


and a second subsleeve


5


around the body portion


13


.




The present invention applies to virtually any containers


9


that call for wrappings on their different portions. Preferably, container


9


is a plastic or glass container used to contain pharmaceutical or food products. The container


9


can have two portions including a body portion


13


and a neck portion


11


. In a preferred embodiment, the body portion


13


is of major dimension and the neck portion


11


is of minor dimension. The neck portion


11


and/or the body portion


13


are preferably cylindrical in shape. The container


9


can have an opening (not shown) at the neck portion


11


. A closure


15


can be used to cap the opening.




The subsleeves


3


and


5


can serve various purposes. For example, they can function as a protective wrap of the container


9


preventing the container


9


from damage during shipment. The first subsleeve


3


on the neck portion


11


of the container


9


can also function as an airtight or hermetic sealing means. In a preferred embodiment, the first subsleeve


3


and/or the second subsleeve


5


can be a preprinted label. In this case, the first subsleeve


3


is preferably long enough to cover the skirt edge


17


of the closure


15


as shown in FIG.


1


. The first subsleeve


3


and the second subsleeve


5


are preferably made of a heat-shrinkable material, such as a heat-shrinkable plastic material.





FIG. 2

shows a sleeve


1


according to the present invention. The sleeve


1


is composed of a first subsleeve


3


and a second subsleeve


5


connected by a perforation


7


. The sleeve


1


is preferably made of a heat-shrinkable plastic material, e.g., a heat-shrinkable plastic material. Generally, the sleeve


1


should have an internal diameter slightly larger than the major dimension of the container


9


and a height substantially corresponding to the exterior height of the container


9


. Therefore, with appropriate positioning of the perforation


7


, the first subsleeve


3


and the second subsleeve


5


will each be capable to cover substantially the neck portion


11


or body portion


13


of the container


9


. As described above, the first subsleeve


3


and/or the second subsleeve


5


can be a preprinted label.




The perforation


7


on the sleeve


1


can be in various patterns. The perforation


7


is designed so that it can be broken when the sleeve


1


is heat shrunk onto the container


9


. As a result, the sleeve


1


is separated as the first subsleeve


3


and the second subsleeve


5


. In a preferred embodiment, a circumferential perforation


7


is formed on the sleeve


1


.




In another preferred embodiment as shown in

FIG. 3

, a wrapping material


30


is formed with a plurality of individual sleeve segments


32


. Each segment


32


has a perforation


7


thereon and is suitable for use in the present invention. Each of these individual sleeve segments


32


takes a predetermined length of the wrapping material and can be cut from the wrapping material in the process of wrapping the container


9


.





FIGS. 4A

,


4


B and


4


C illustrate the steps in a method for wrapping a container


9


according to the present invention. As shown in

FIG. 4A

, a sleeve


1


according to the present invention is provided having a first subsleeve


3


and a second subsleeve


5


. The first and the second subsleeves


3


and


5


are connected by a perforation


7


.




In carrying out the method of the present invention, sleeve


1


with a perforation


7


is placed over the container


9


, as shown in

FIG. 4A

, with first subsleeve


3


substantially covering neck portion


11


of container


9


and second subsleeve


5


substantially covering body portion


13


of container


9


. Then, as per

FIG. 4B

, sufficient heat is applied to the sleeve


1


in a conventional manner, causing sleeve


1


to shrink. As the sleeve


1


shrinks, the first subsleeve


3


and the second subsleeve


5


pull apart from each other. As shown in

FIG. 4C

, the sleeve


1


thus breaks at the perforation


7


and is separated into two independent subsleeves


3


and


5


. The two subsleeves


3


and


5


continue to shrink until they become in snug surface engagement with the neck portion


11


and the body portion


13


of the container


9


, respectively.




The foregoing description is intended to illustrate the present invention, and it is understood that changes and variations can be made in the foregoing embodiments without departing from the spirit and scope of the present invention which is defined in the following claims.



Claims
  • 1. An article comprising in combination:a container having a minor portion and a major portion; and a first subsleeve wrapping the minor portion and a second subsleeve wrapping the major portion, the first subsleeve and the second subsleeve being separated and disconnected from each other and tightly sealing the minor and the major portions respectively, wherein the first subsleeve and the second subsleeve were connected as an integral sleeve through a perforation before being subject to a heating process to apply the integral sleeve onto the container as the first and second subsleeves.
  • 2. The article of claim 1, wherein the minor portion is a neck portion and the major portion is a body portion.
  • 3. The article of claim 2, wherein the neck portion and the body portion of the container is cylindrical in shape.
  • 4. The article of claim 1, wherein the first subsleeve and the second subsleeve are made of a heat-shrinkable material.
  • 5. The article of claim 1, wherein at least one of the first subsleeve and the second subsleeve is a preprinted label.
  • 6. A method for wrapping a container having a minor portion and a major portion comprising the steps of:providing a heat-shrinkable sleeve having a first and a second subsleeves connected by a perforation; placing said sleeve over the container so that the first and second subsleeves surround the minor and major portions of the container respectively; and heating the sleeve sufficiently, whereby the sleeve shrinks onto the container and breaks at the perforation to separate the first and the second subsleeves, which continue to shrink into a snug surface and tight sealing engagement with the minor portion and the major portion of the container respectively.
  • 7. A wrapping sleeve for wrapping a container having a minor portion and a major portion comprising a first and a second subsleeves connected by a perforation, the first subsleeve being adapted to wrap the minor portion of the container and the second subsleeve being adapted to wrap the major portion of the container,wherein the first and second subsleeves are separated and discontinued from the perforation to wrap around and tightly seal the minor portion and the major portion respectively and simultaneously after heat being applied to the sleeve.
  • 8. The wrapping sleeve of claim 7, wherein the sleeve is made of a heat-shrinkable material.
  • 9. The wrapping sleeve of claim 8, wherein the perforation is capable of breaking upon the shrinkage of the sleeve.
  • 10. The wrapping sleeve of claim 9, wherein the perforation is a circumferential perforation.
  • 11. The wrapping sleeve of claim 9, wherein at least one of the first subsleeve and the second subsleeve is a preprinted label.
  • 12. A wrapping material comprising a plurality of sleeve segments for wrapping containers having a minor portion and a major portion, wherein each sleeve segment has a first and a second subsleeves connected by a perforation, the first subsleeve being adapted to wrap the minor portion of the container and the second subsleeve being adapted to wrap the major portion of the container,wherein the perforation is broken and the first and second subsleeves are separated to tightly and simultaneously seal the minor and major portions after the sleeve being subject to sufficient heating.
US Referenced Citations (30)
Number Name Date Kind
2790285 Pike et al. Apr 1957
3014320 Harrison Dec 1961
3110554 Yazumi Nov 1963
3235112 Fillwalk et al. Feb 1966
3604584 Shank, Jr. Sep 1971
3698586 Terner Oct 1972
3733002 Fujio May 1973
3767496 Amberg et al. Oct 1973
3811591 Novitch May 1974
4011122 Ashcroft Mar 1977
4013496 Amberg Mar 1977
4016706 Braker et al. Apr 1977
4018640 Amberg Apr 1977
4034131 Rhoads Jul 1977
4051265 Kirshenbaum et al. Sep 1977
4172873 Spicer Oct 1979
4248030 Heckman Feb 1981
4447280 Malthouse May 1984
4496409 Kontz Jan 1985
4544073 Willis Oct 1985
4608284 Roales Aug 1986
4661188 Fumei Apr 1987
4923557 Dickey May 1990
4983238 Yoshida et al. Jan 1991
5186988 Dixon Feb 1993
5240529 Hoffman Aug 1993
5383558 Wilkinson et al. Jan 1995
5512120 Hinton et al. Apr 1996
5524782 Salemi Jun 1996
5605230 Marino, Jr. et al. Feb 1997