Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
1998-03-27
2001-03-13
Vargot, Mathieu D. (Department: 1732)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C156S510000, C264S571000, C264S152000, C264S175000, C264S335000, C264S295000, C264S339000, C425S290000, C425S291000, C425S366000, C425S388000, C425S437000
Reexamination Certificate
active
06200406
ABSTRACT:
TECHNICAL FIELD
This invention relates to a method of forming paper cups and a production apparatus for manufacturing the aforesaid cups. More particularly it relates to a method and an apparatus for continuously supplying a paper for making a cup which is not cut to be supplied to a roll gap between a pair of conical continuously rotating rolls and pasting them at the timing and the place which varies depend on the kind of sealing material and then cutting it as a blank for making one cake cup and then forming it as a bottomless hollow frusto-conical side wall and introducing it towards a forwarding ends of a pair of small diameter forming ends.
BACKGROUND ART
Fifty to two hunded of thus shaped side walls are supplied as a unit and stacked together according to the prior art, and a bottom plate formed by the prior art is inserted, then the side wall and the bottom plate are joined by a pasting or the like as a finished cup. This method and apparatus can also be used for making a cup using a blank previously cut into a fan shaped configuration. Heretofore, a side wall of the cup has been formed by using a cup side wall shaping machine as illustrating by FIG.
12
. This side wall shaping machine is composed of a pair of wings
9
and
9
′ capable of being moved slightly upwards and downwards about a connecting pin
7
along the groove
8
, a pair of swingable pin
15
and
15
are disposed at the outer side portions between the outer ends of swingably movable end and the inner end movable around the connecting pin
7
, the swingable pins
15
are also placed at each of the two top points of the operating rods
30
and
30
; A slider
20
and an urging rod which urges these wings
9
upwards and downwards as a whole and moves the urging rod
6
disposed at the upward end of the connecting rod
21
to move the blank
1
is mounted between the end connected by the pin
7
and the other free end, swingable pins
15
are opened or closed by the operating rod
21
and a slider
20
which pushes the blank
1
against a frusto-conical shape, hereafter it can be referred only to a cone roll or a cone
4
; Operating rods
30
which push said pair of wings
9
and
9
′ to open or close in a harmonized manner:
As rolled paper for making the cups is cut into each fan shaped size as a blank and is supplied to a side wall shaping machine not shown. Next, the blank
1
supplied to the lower face of the cone roll
4
is further pushed by a pusher member
6
, then the blank is further pushed between the two inner faces
22
of each of the swings
9
having the same convexed face as the concaved outer face of cone roll
4
and is further clamped between two faces and is further sealed as a frusto-conical cup. Then wings
9
and
9
′ are opened to send the completed cup having thus shaped frusto-conical shape to its axially small diameter side and the next blank to be worked as a next cup is set ready for supplying to the lower part of said cone roll
4
and thus one cycle can be finished.
Sealing of the Pasting Portion of the Formed Cup
Heretofore, a sealing of a formed cup has been conducted using a sealing agent noted below. As a sealing agents there are three kinds of sealing agents, such as, glue seal, hot-melt seal, heat seal of laminated hot melt seal, and these method using three kinds of sealing will be explained hereafter.
Glue Sealing
Glue is a water solution of alpha (&agr;) starch. Since it is applied before it is sealed and is dried in natural air at the time for drying and solidifying and this differs depend upon the concentration thereof and requires some extent of drying, and therefore the capacity of cup making is restricted by the kind of glue to be used.
Hot Melt Seal
Since the interfacial tension of the thermally plastic resinous material to the paper is small, therefore such kind of glue is used which is liable to adhere to the paper and having strong adhesion power to the paper after cooling. In order to make easier the sealing operation, several kinds of synthetic resinous materials are selected to mix them to lower the thermal fusion temperature and to increase the sealing strength. For example, polyethylene having high adhesion force at about 120° C. to the paper, and paraffin having lower adhesion force having thermally softening temperature of 60-80° C. are selected to mix them to satisfy the required sealing agents. Generally, sealing agents formed as pellet shape or as a string shape is fused into liquid state by using fusing apparatus attached to the gun and applied to a portion by means of springs or compressed air.
Heat Sealing by Means of Laminated Polyethylene
This sealing agent is made on a mass production scale by using an equipment as mentioned below, so it is able to apply a thin film of polyethylene over the entire surface of the paper material of the cup. FIGS.
13
(A) and (B) depict a side view and a front view of the production equipment of the polyethylene paper, and there is a rolled polyethylene laminated paper is supplied on the upper surface thereof fused thin film of polyethylene
63
by an electro-thermal fuser
64
named as a T die disposed above it when it passes through a polyethylene extender
62
consisting of a pair of rolls
62
a
and
62
b
spaced parallel at a desired spacing. The paper
61
covered with a thin film of fused polyethylene film
63
are fed as a one body of polyethylene adhered film
65
and is wound around a winding roll
66
disposed around down stream side. In this manner, if a paper adhered with polyethylene film of 15 &mgr; (micron) is heated for adhesion, then polyethylene is melted and a seal where polyethylene is confronting face to face with each other would be made consolidated, however, these bodies will immediately solidify upon removal of heat source. For papers of general purpose use which is not covered with coating agent for increasing their printing effects or with aluminum foil bonding for improving decoration effects, is required to place such adhesion improving agents. For compacting sealing or overlapped type sealing, polyethylene which solidifies upon removal of heat source is used for adhesion.
Properties of Each of the Sealing Agents
1)Heat Resistant Property
If the cake is worked above 150° C., glue only is selected. For the cake of steamed type both a glue and a polyethylene laminated paper (120° C.) are used and it is determined that whether they should be used depends on the quantity of the paraffin to be used.
2) Water Proofing Property
Since polyethylene is strong in water proofing property, it can be used for cups for storing drinks and hot melted raw material is strong enough for storing water, however, from the view point of its price it is impossible to cover all the surface of the paper. Glue is poor in water resistancy.
3)Workability of Coating and Sealing
Polyethylene>Glue>Hot melt
4) Prices
Glue is lowest and hot melt is most expensive while polyethylene is placed between the two.
(1) Shaping of the Side Wall and the Apparatus to be Used for
As already mentioned, a pair of wings and a pair of cone rolls are combined together for utilizing an up and down motion and right and left wing motion to make paper for cups, which is lower in strength and is liable to be broken more easy as compared with metal plates, to wind up around a cone roll using reciprocating open and shut down motion. There is a limit for repeating opening and shutting motion and there is a need to feed a paper for cups to be supplied previously formed and cut as a fan shaped blank. So it has been desired that a method and an apparatus for making side walls of paper cups with higher speed can be provided, because the former apparatus have drawbacks that they were poor in high speed operation, complicated construction, high wear ratio and poor in productibility. Upto the present, if the cup is top sealed type as for the cone cup of ice cream, it has been possible to make a cup by winding a cup around the outer surface of the cone rolls and blowing air from the large diameter opening side after the c
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Vargot Mathieu D.
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