Dispensing – Collapsible wall-type container – Nonmetallic
Patent
1986-10-20
1988-03-29
Rolla, Joseph J.
Dispensing
Collapsible wall-type container
Nonmetallic
222215, 222556, 2643287, 425577, 249146, 215235, 220337, B65D 3508, A23P 100
Patent
active
047338016
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of and means for manufacture of a dispenser for viscous or semiviscous material and in particular it relates to a dispenser of the type generally referred to in my earlier specification published under International Publication No. WO81/01544, of the 11th June, 1981 and based on Australian priority date of the 30th Nov., 1979.
In that earlier specification a method of moulding a one piece tube with an integral cap was described and the present invention relates to certain improvements to that form of production and structure but is not necessarily limited only to that tube construction, but applies generally where production of a tube is by use of an outer die and an inner movable core between which a cavity is formed to provide an injection moulded tube of the required characteristics.
One of the problems with this type of construction is the maintenance of the core position as core shift or core bend, hereinafter included in the term `core shift`, is known to occur and can result in uneven moulding and similar problems but is one of the objects of the present invention to overcome this problem and to provide a method of and means for allowing moulding to be very effectively controlled to avoid core shift and similar problems.
It is also an object of the invention to provide a highly effective form of forming a unitary tube having a displaceable cap which can be moulded by a single injection operation.
The basis of the preferred form of the present invention is the use of a first aligning face which may be formed in a recess in the die and a second aligning face which may be formed on the core, so arranged that at the commencement of the injection cycle the plastic is injected through a duct into the area defined by either aligning face, flow takes place from the duct through channels radiating out from the duct to effect adequate flow control of the plastic flow in the required directions and to control the quantity in such directions, but to so arrange the position of the core in relation to the die that just before the cessation of the flow cycle, or during the latter part of such flow cycle, the core is moved axially in relation to the die to allow a complete membrane to be formed across the end of the moulded tube, the shaping of the recess and projection being such that around the periphery an angle is used which during the initial part of the injection firmly holds the core in alignment in the outer die but nearing the end of the injection cycle the space between the aligning faces is opened out to provide the membrane which then extends across the tube and carries the nozzle through which discharge of material carried by the tube takes place.
In its broadest form the invention is designed to stabilize an elongated core which needs to project freely into a cavity in a die which may have unequal forces on it due to the shape of the article formed, or flow characteristics of the filling material, and in such a case the invention has interengaging aligning faces at the critical otherwise unsupported inner end portion of the core and die to prevent core shift during initial injection into the cavity, and when stabilizing of the core in the cavity occurs during injection, the core or portion of it is moved slightly relative to the die to form a continuous membrane across the area where the aligning face had prevented deposition.
In this way the core is held stable at the critcal start of the injection cycle but then is completed by moving the aligning faces apart to allow injection to continue into these spaces.
Thus the method of manufacture of a dispenser for viscous or semi-viscous materials according to the preferred form of this invention in which a hollow inner die has projecting into it a core to form between them a cavity which defines the dispenser which has one end closed but may include a discharge nozzle and has a wall at the perimeter of the end closure extending substantially on one side thereof to form the elongated hollow body of the tube, the method co
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Adams Bruce L.
Huppert Michael S.
Rolla Joseph J.
Wilks Van C.
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