JPH0324330B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a flanged extrusion container by blow molding plastic, which does not leave highly viscous contents and can be extruded in appropriate amounts.

An extrusion container with a flange is suitable for use as a container for highly viscous materials, such as mayonnaise, polishing powder, and cosmetic cream, by extruding the contents in appropriate amounts without leaving any residue. In this case, it is desirable that the flange be thick in order to increase the strength, and that the container be formed so that the wall thickness becomes thinner toward the flange in order to facilitate extrusion of the contents.

SUMMARY OF THE INVENTION Therefore, the present invention seeks to provide a method for easily manufacturing a flanged extruded container having the desired configuration as described above.

Hereinafter, the method of the present invention will be explained based on the drawings.

FIG. 1 shows an example of a flanged extruded container manufactured by the method of the present invention. This flanged extruded container 1 is constructed by blow molding thermoplastic plastic, and an annular flange 2 is formed in the middle part of the flanged extruded container 1. The other half 3 is integrally formed with a container half 4. The container halves 3 and 4 are curved toward one side and the other side, respectively, with the flange 2 as a boundary, and an outlet 5 for extruding the contents is formed protruding from the top of the container half 3. A push-in portion 6 is formed at the bottom of the body 4. The container half 3 and the container half 4 have a substantially symmetrical shape with the flange 2 as a boundary, and the container half 4 can be pressed and deformed into a folded shape with respect to the container half 3. It is becoming. In order to facilitate press deformation, the wall thickness is formed to become thinner toward the flange 2. The flange 2 is attached to the container half 3 during blow molding.
The double walls formed by the connecting portions 4 and 4 are crushed and fused to form a wall thicker than the surrounding walls. Also,
The container halves 3 and 4 are curved toward one side and the other side with the flange 2 as a boundary, but the shapes are not limited to these, and the shapes of the container halves 3 and 4 are respectively curved. For example, it may be linear, or it may be bellows-shaped with a plurality of steps. Reference numeral 7 denotes a cap, which is detachably attached to the outlet 5 for extruding contents.

The flanged extruded container 1 has a single layer, multilayer, or multilayer structure. In the case of a single layer structure, the resin used is polyolefin resin such as polyethylene or polypropylene, or ethylene-
Vinyl acetate copolymers, polyvinyl chloride resins, polyamide resins, and various thermoplastic elastomers such as polyesters and polyurethanes are used. In the case of multilayer structures, polyolefin resins such as polyethylene and polypropylene are used for the inner and outer layers. It is preferable to use an oxygen barrier resin such as an ethylene-vinyl alcohol copolymer in the intermediate layer.

Flange-equipped extrusion container 1 having the above configuration
is manufactured by blow molding according to the steps shown in FIGS. 2 to 4 except for the cap 7.

The split mold 8 used for the blow molding is of a split type and consists of an upper mold 9 and a lower mold 10 that are vertically slidable. It has approximately the same external shape as the extruded container 1.

The process of forming the flanged extruded container 1 using the split mold 8 is as follows. That is, the upper mold 9 and the lower mold 10 are kept sufficiently apart from each other, and the parison a is suspended from the extrusion die 11 between the two divided molds 8 (FIG. 2). Next, the split molds 8, 8 are tightened, and a compressed fluid such as air is blown into the parison a to form the parison a into the shape of the cavity (FIG. 3). In this state, since there is a sufficient distance between the upper mold 9 and the lower mold 10, a hollow annular bulge 2 is formed at the intermediate portion between one half 3 and the other half 4 of the container. ' is formed. Therefore, by sliding the upper mold 9 and the lower mold 10 to narrow the gap therebetween and crushing and welding the annular bulge 2', a thick-walled flange 2 is formed (FIG. 4). In the container half of the flanged extruded container 1 that is blow-molded in this way, the blow ratio increases toward the flange 2, so the wall thickness becomes gradually thinner toward the flange 2. molded. For this reason, the flanged extruded container 1 that is blow-molded as described above has a thick flange 2, which increases the strength of the container, and the half of the container is easily deformed in the extrusion direction. It becomes easy to extrude the stored items.

Note that the shape of the flange is not particularly limited, and for example, the flange 2a may have a shape having an annular bulge on the outer periphery as shown in FIG. Further, as the split molds 8, 8, a middle mold 12 fitted to the outer peripheral surfaces of an upper mold 9 and a lower mold 10 may be used as shown in FIG.

As is clear from the above description, the method for producing a flanged extruded container according to the present invention has an annular flange in the middle of the container, and one half of the container is separated from the other half by the flange. A method for manufacturing an extruded container whose halves can be pressed and deformed into a folded shape by blow molding plastic, in which one half of the container and the other half are integrally molded,
According to this method, a hollow annular bulge is formed in the middle part, and then this annular bulge is crushed and fused to form a thick-walled flange.
It is possible to extremely easily manufacture a flanged extrusion container which has a thick flange and has high strength, and which allows the container to be easily extruded by making the wall thickness of the container thinner toward the flange.

In addition, by forming the parison into a multilayer structure as described above, it is possible to obtain a flanged extruded container that has excellent oxygen barrier properties that are not dependent on humidity and is more flexible than a single layer of polyolefin.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a partially cutaway front view of a molded extruded container with a flange, and FIGS. 2 to 4 are cross-sectional views showing the molding process. FIG. 5 is a sectional view showing the molding process of another example. 1...Flanged extruded container, 2...Flange,
3, 4...Half of the container, 8...Divided mold, 9...
Upper die, 10... lower die, 11... extrusion die, a...
Parison, 2'... annular bulge.

Claims (1)

[Claims] 1. An extruded container that has an annular flange in the middle of the container, and can be deformed by pressing one half of the container in a folded manner with the flange as a boundary, is manufactured by blow molding plastic. In this method, when one half of the container and the other half of the container are integrally molded, a hollow annular bulge is formed in the middle part, and then this annular bulge is crushed and fused. A method for manufacturing a flanged extruded container, characterized in that a thick-walled flange is formed using a flange.