Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
1998-03-26
2001-01-16
Maki, Steven D. (Department: 1733)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C156S242000, C156S244130, C156S244270, C156S272400, C156S292000, C156S294000, C264S259000, C264SDIG004, C222S094000
Reexamination Certificate
active
06174393
ABSTRACT:
BACKGROUND OF THE INVENTION
A process is known in which a pre-finished tube pipe is connected with an also pre-finished tube head. Subsequently, a partition structured in folded form, which is resilient in its lengthwise and crosswise direction, is pushed into the tube pipe. Optionally, the partition, i.e. one of its crosswise sides, is connected with the tube head by gluing, while the other crosswise side is combined with the closure seam of the tube. Because of the inherent spring forces, which act in the crosswise and lengthwise direction, the partition presses against the inside of the tube pipe with its lengthwise sides, and, unless gluing on the inside of the tube head is provided, against the closure seam and the tube head.
In this process, the partition is installed in the interior of a pre-finished tube, a method of procedure which is difficult to automate.
Another process is characterized in that a pre-finished head is provided with a partition—this is done by mechanical means which connect the partition with the head—whereupon the partition, with the head, is introduced into a tube pipe to such an extent that the head can be connected with the tube pipe in known manner—bonding of tube head and tube pipe along the external circumference of the head.
In this process, as compared with the first process mentioned, introduction of the partition into the tube element is simplified, but this occurs at the expense of the prior unification of partition and head, which represents an addition process step, relative to the number of process steps of the first process mentioned, which again is difficult to automate.
The disadvantage of the known processes is that using these processes, pre-finished tube components are brought together, in other words they are fundamentally assembly processes, which are kept within narrow limits of process economics, for example yield of tubes per time unit, by complex automated process steps, particularly if the assembly processes additionally comprise connection processes involving gluing or melting.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a process for the production of multi-chamber tubes, with which the disadvantages of the known processes are avoided, and this task is accomplished by means of a process for the production of a multi-chamber packaging tube made of plastic, the tube consisting of a tube pipe, a tube head, and at least one partition housed in the tube pipe, in which the tube head is formed by means of a die, comprising a matrix and a mandrel as die halves, by molding a portion of plastic material, and, at the same time, attached to the tube pipe, characterized by the following process steps:
(a) charging the mandrel with the partition;
(b) applying the tube pipe to the mandrel which has been charged with the partition;
(c) melting the edges of a second partial piece of the partition together with the inside surface of the tube head;
(d) bonding the lengthwise edges of a first partial piece of the partition to the inside surface of the tube pipe.
To accomplish the task, the invention proceeds from a so-called head forming/attachment process. A head forming/attachment process for the production of packaging tubes, consisting of a tube pipe and a tube head, is a process is in which a pre-finished tube pipe is connected with a tube head, while the latter is formed, i.e. molded. The head forming/attachment process is divided into two variants, which are determined according to the technique by which the head is formed from a plastic. A differentiation is made between an injection molding process and an extrusion die process. Both processes work with a mold consisting of two mold halves, referred to as the matrix and the mandrel in the specific case of tube production, which are charged with plastics to form a head. In the case of injection molding, a closed mold (mandrel moved into the matrix) is charged with a liquid plastic, while in the extrusion die process, an open matrix is filled with a portion of plasticized plastic and then the mandrel is moved in. As it moves in, the mandrel molds the material portion into a head. Since the mandrels carry the tube pipe on their circumference in both process variants, the latter are molded onto the heads as they are formed. Both process variants-have been developed to a high technical level and are characterized by a yield of a high number of tube pieces per time unit. To accomplish the task according to the invention, the invention turns away from known assembly processes, on the one hand, and towards head forming/attachment processes, which are equally known, on the other hand, but develops the latter further in that it prescribes that the mandrel, fitted with the tube pipe and the partition, be used to form a multi-part tube as a mold half of an injection-molding or extrusion die mold. In the available charging techniques, an extension of the charging time of the mandrel with a pipe can be kept within limits as compared with the charging time with a pipe and a partition, so that the high production efficiency of the head forming/attachment process is essentially not impaired. The process according to the invention offers the advantage that an end of the partition which runs into the head connects with the latter on its own as the head is formed, which in itself already represents a significant simplification of the production of a multi-chamber tube.
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Bachman & LaPointe P.C.
KMK Lizence Ltd.
Maki Steven D.
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