Package making – Methods – Closing package or filled receptacle
Reexamination Certificate
2002-02-06
2003-12-30
Rada, Rinaldi I. (Department: 3721)
Package making
Methods
Closing package or filled receptacle
C053S467000, C053S471000, C053S475000, C053S329200, C053S329300, C053S329400
Reexamination Certificate
active
06668524
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a packaging system with a tool for enclosing electronic components on a carrying belt, and a method of populating the carrying belt.
To enclose electronic components on a carrying or transport belt, a covering film is applied to the transport belt. The covering film covers openings on the upper side of the carrying belt, in which the electronic components to be transported are located. To enclose the electronic components, the covering film is laid over the openings and pressed onto the carrying belt with a hot tool, the openings in which the electronic components are located being sealed.
After the sealing operation, the carrying belt must comply with geometric and physical parameters predefined in accordance with the EIA Standard No. 481-1A. The pull-off force of the covering film from the carrying belt, which has to be complied with in accordance with the standard, should lie in the range of 0.1 to 1 N for the covering film, in order to be able to remove the components from the openings in the carrying belt with little expenditure of force in an automatic insertion machine. In addition, the value of the pull-off force should offer adequate security in order that the covering film cannot be detached during transport. Furthermore, the curvature over a width of the carrying belt must not exceed a limiting value. The curvature or bulging or bowing must not be greater than 1 mm over 250 mm. Therefore, the ratio of bending in millimeters to the width of the belt in millimeters must not exceed 1:250. While in the case of belts made of plastic, compliance with the limiting values of the standard is relatively unproblematic, the result is continual failures during the packaging and enclosure of electronic components in hygroscopic carrying belts.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a packaging system with a tool for enclosing electronic components, and a method of populating a carrying belt that overcome the above-mentioned disadvantages of the prior art devices and methods of this general type, with which, irrespective of the carrying belt material used, reliable enclosure of the electronic components in the carrying belt can be implemented. In particular, it is an object of the invention to minimize the high failures when hygroscopic carrying belts are used.
With the foregoing and other objects in view there is provided, in accordance with the invention, a packaging system. The packaging system contains a tool for enclosing electronic components disposed in openings formed in an upper side of a carrying belt having a given width. The tool has a heatable punch with a punch face. In a rest position the punch face is disposed parallel to a covering film disposed on the carrying belt. The covering film has a width that is less than the given width of the carrying belt. The punch face has a plurality of punch face strips spaced apart from one another and are disposed so as to not overlap the openings in the carrying belt. In a sealing position of the tool, at least one of the punch face strips is disposed on the upper side of the carrying belt in a region not covered by the covering
According to the invention, the packaging system is specified with the tool for enclosing the electronic components in the carrying belt. Carrying belts of this type have on their upper side openings to accommodate individual electronic components. Such openings can be blind openings, which have been made in the carrying belt, or can be through openings, in which, before being used in a packaging system, a bottom film has been applied to the rear side of the carrying belt with the through holes, in order to close the latter on one side.
The tool of the packaging system according to the invention has a heatable punch, whose punch face, in the rest position, is disposed parallel to a covering film for the carrying belt. Here, the covering film has a smaller width than the width of the carrying belt. The punch face of the punch has, according to the invention, a plurality of punch face strips spaced apart from one another. The strips are disposed in such a way that they do not cover the openings in the carrying belt, and at least one of the punch face strips is disposed on the upper side of the carrying belt that is not covered by the covering film in the sealing position of the tool.
The subject of the invention has the advantage that not only is the region to be sealed gripped and heated by the punch face in the edge region of the openings, but also the upper side of the carrying belt not covered by the covering film is in contact with the heated punch, on account of the at least one additional punch face strip. As a result, the carrying belt is heated up relatively uniformly over its entire area, so that even carrying belts made of hygroscopic material do not distort during heating and sealing and thus remain within the specified curvature tolerance range of the EIA Standard 481-1A.
By use of the invention, the material-induced waste, in particular for belts with hygroscopic properties, is thus reduced, so that the punch face configuration supplies sealing results, irrespective of the type and the material of the carrying belt, which completely satisfy the limiting values of the above standard for carrying belts. Although the tool and the packaging system according to the invention can be used particularly advantageously for hygroscopic carrying belts, it can also be used successfully to process less hygroscopic belts, such as plastic belts.
In one embodiment of the invention, the punch face of the tool has an offset. The offset corresponds to the height difference between the upper side of the carrying belt free of covering film and the upper side of the covering film in the sealing position. The offset therefore results from a different depth formation of the punch face strips on the one hand for the upper side of the carrying belt free of covering film and on the other hand for the upper side of the covering film in the sealing position. Consequently, the offset is slightly smaller than the thickness of the covering film, specifically by the amount by which the foil reduces during sealing in the region of the punch face strips on the upper side of the covering film.
In a further embodiment of the invention, cutouts are provided between the punch face strips, a first cutout corresponding to the region of the openings in the carrying belt. In the case of this embodiment of the invention, care is advantageously taken that no punch face region is disposed over one of the openings in the carrying belt, which avoids the risk that covering film material will be pressed into the opening.
A further preferred embodiment of the invention provides for the punch face to have a cutout at the transition from the upper side of the carrying belt free of covering film to the upper side of the carrying belt covered with covering film. The cutout provides a clearance of the offset between the upper side of the carrying belt free of covering film and the upper side of the covering film in the sealing position. This makes it easier to align the covering film and the tool in the packaging system, since as a result of the clearance, a greater tolerance is permissible in aligning the covering film in the packaging system in relation to the tool and the punch face.
In addition, by the cutout at the transition from the upper side of the carrying belt free of covering film to the upper side of the covering film in the sealing position, it can be ensured that the edge of the punch face strip on the surface of the covering film does not coincide with the outer edge of the covering film or project beyond the latter. This ensures that no heat is introduced into the edge region and into the outer edges of the covering film. Introducing heat into the edges of the covering film increases the risk of stringing and of the covering film material sticking to the punch face of the tool. This risk does not arise in the pa
Desai Hemant M.
Greenberg Laurence A.
Infineon - Technologies AG
Mayback Gregory L.
Rada Rinaldi I.
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