DE1454838A1 - Tubular discharge cannula - Google Patents

Description

P 14 54 858.O

Minnesota Mining and Manufacturing Company, Saint Paul,

Minnesota 55101, USA.

Tubular outlet cannula

The invention relates to tubular outlet cannula for liquid or plastic substances to be dispensed from flexible containers.

There are already tubular outlet cannulas with rear cutting edges for tearing open one for emptying Liquid used in a printing press container known.

The invention is based on the object of creating an improved outlet cannula with a tear-open device, which in particular ensures that the liquid does not flow out of a flexible fluid container by folding or sections of the plastic film of the loading

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- 2 holder can be hindered or locked.

Although not limited to this, find in accordance with the present Invention manufactured cannulas special use in the encapsulation of wire splices, as shown in U.S. Patent No. 2,967,795. Like there indicated, the enclosed splice area becomes strong encapsulated with solidifiable liquid resin that under Print from a flexible sleeve or pouch for use comes in which the resin is mixed just before application «The bag containing the mixed resin is placed in a printing press with an opening that opens leads to the splice closure, is provided and that Resin is then removed from the container by the action of the press in the XJmsehliessung and around the splice pressed. .

The present invention provides a cannula that can be attached to the hermetically sealed bags or containers prior to placing the same in the printing press can. The cannula ensures a leak-proof effective Connection to the entry duct of the splice enclosure. It is held rigidly in the press. Of the The bag remains sealed until pressure is applied, at which point the skin or film is punctured by the cannula is used to control the flow of resin from: the bag into the:

em splicing under extreme pressure and without

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To allow loss or leakage. In particular, the cannula mainly allows complete transfer of the resin from the sleeve to the splice, regardless of the accidental or inevitable fold or displacement of the plastic film container wall over the inner end of the cannula.

According to the invention, a tubular outlet is with cannula Cutting therethrough to pierce a container used to drain liquid in a printing press marked »that it contains a pipe with a base, which has an exposed ring-shaped foil contact surface and a sharp-edged, thin, tubular, overhanging one the film contact surface and in the middle of the same having extending extension, wherein the tube is grooved annularly between the surface and the extension and the extension is provided with passages or slots open to the groove.

In the drawing, which is an example of execution of the invention are:

1 is a side elevational view of a perforation cannula; which shows a device for attaching the same to a case or a bag,

FIG. 2 is a front elevational view of the cannula of FIG. 1;

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partly in section showing an alternative fastening device shows,

Fig. 5 is a bottom view and

Fig. 4 is a partial sectional view of the cannula according to the Figs. 1 and 2.

The cannula 10 can conveniently and economically from one hard synthetic resin & eformed for what high impact resistant transparent polystyrene resin is a preferred material. Preferably it is glued to the resin-containing shell by means of an overlapping disc-shaped or diamond-shaped perforated in the middle Segment made of pressure-sensitive plastic film adhesive tape 11, which is attached with the adhesive coated surface facing down as indicated in FIG is or by a ring of double-coated tape 12, which is a thin compressible support fabric contains that on both surfaces with the pressure sensitive Tape adhesive is coated and adhesively attached, as shown in Fig. 2 - A typical cannula with the relative proportions according to the drawing will be just a little more than 50.8 mm long

The tubular body 13 of the cannula is expediently on one end with self-tapping outer screw threads I ^ for the outlet-proof connection with

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a relatively soft tubular injection channel member provided on a splicing device. At the opposite end are an extended annular disc 15 and a central thin tubular Extension 16 is provided which is slotted in the longitudinal direction to form four elongated, narrow channels 17 and beveled at the end to form the cutting edges 18. .

The disk 15 has a flat top surface, as in FIGS Figures 1, 2 and 4 can be seen, as well as a lower surface extending from the edge of the ring to the base of a circular in cross-section triangular locking ring 19 tapers. The slotted tube l6 extends noticeably below the ring 19, which in turn is slightly below the inner flat lower surface 20 of the Disc 15 extends.

The lower outer surface of the tube 13 has two opposite locking projections 21 and two opposite handling ribs provided, which also serve as locking projections. The links ^ 21 and 22 have 15 from the top surface of the disc equidistant with a distance sufficient to allow the cannula to be inserted into an appropriate Way radially slotted and provided with cams pressure

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- 6 press end caps can be inserted and tightened

The outlet cannula is glued to the smooth surface of the resin-containing sheath, the protruding cutting edges 18 of the tubular extension 16 gently pressing against the smooth film surface. The sheath is then placed in the open cylinder of the printing press. The cannula is pulled through the end cap, which is open in the middle and which is radially slotted and cranked in order to receive the projections 21, 22 in the manner of a quick-release screw connection. The cap is then secured over the open end of the barrel and the cannula is tightened into position by rotation. The flat top surface of disc 15, with or without the intervening thin plastic tape 11, is thereby held tightly against the inner surface of the cap. The threaded end of the cannula is screwed into the injection channel part or held in some other way for the supply of resin in position "It; is dapn pressure on the piston of the printing press _s ausgejäbj | · -The resulting hydraulic pressure keeps die.-! KunstsfcpffGrlie tightly against the ring 19 while the foil is pressed into the open center of the tube 16 and into the annular opening which surrounds the tube. Under the tension thus imparted, and especially because of the presence of the sharp corners of the pipe end at the edges of the channels 17, the foil becomes

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immediately perforated and bursts over part of the surface in the ring 19, thus allowing the resinous contents to be delivered under pressure through the cannula to become.

When the resin is delivered and see the shell or the bag folds up, although one or more folds in the film body of the envelope can occur across lay the open end of the tube 16 and itself over the whole area surrounded by the ring 19, however the access for the remaining resin to the open annular channel surrounding the tube 16 cannot blocked because of the extension of the tube below the height of the ring. Simultaneously the slots 17 provide for the passage of the resin the hollow center of the cannula. Therefore, the envelope or the bag is essentially completely emptied of the resin. The printing press is then opened, the cannula is freed from the press cap and the emptied sleeve with the Attached cannula is removed and discarded, leaving the press and cap clean and free of resin stay.

Claims

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Claims (4)

Claims [1TnTubular outlet cannula with cairn silk for perforation a container used for emptying liquid into a printing press, characterized by a Tube (13) with a base, which has an exposed ring-shaped foil contact surface (20) and a sharp-edged one thin tubular, look beyond the polishing surface and in the middle of the same extending extension (16), the tube (13) being annularly grooved between the surface and the extension and the extension with passages open towards the groove (17) is provided. 2.) outlet cannula according to claim 1, characterized in that that the pipe (I3) instead of the extension provided with openings has a longitudinally seated sharp-edged, thin, tubular, beyond the film contact surface (20) and in the middle of the same extending extension (16) which is surrounded by the annular groove. 3.) outlet cannula according to claim 1 or 2, characterized in that that the same on the tube (13) includes a radially extending annular flat flange which is provided with a surface provided with one or more rings (19) for contact with a container. 909807/0894 4.) outlet cannula according to one of the preceding claims, characterized in that it contains an extensive planetary disk at one end, which on their outer, flat end face have an angled, ring-shaped, raised cross-section Longitudinal axis of the cannula evenly surrounding projection · Contains and that the tube also has outer, radially projecting fastening parts (21, 22) for rigid connection is provided with a printing press cap. M 1393 / G. 909807/0894