FI59357B - FOERFARANDE FOER FRAMSTAELLNING AV EN BEHAOLLARE - Google Patents

Description

RjSr ^ l ΓβΙ. «V ^ ANNOUNCEMENT R Q7 pn lBJ" UTLÄCCNINCSSKRIFT 5 935 7 c (45) Patent granted 10 03 1931 Patent sieddelat ^ ^ (51) Kv.ik? /Int.ci.3 B 31 B 1/60 , B 29 P 1/10 FINLAND —FINLAND (21) fmnttlhalM <wN — Ρμ · μ · μΜμ «<ιΧ T51589 (22) Hakemtapftlv · —Afw (M <Ning * d« g 30.03 * 75 (23) AHwpaM — CIM «HM * da | 30.05 * 75 (41) Tulkit Jvlkhakal — SIMc offmrtig 01.12.75

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England-England (GB) 21 + 328 / 7¾ (71) Airfix Industries Limited, 17 Old Court Place, London W.8.,

The present invention relates to the production of a tank - to the production of a tank (GB) (72) Kenneth Francis Rumball, Great Brookham, Surrey, England-England (GB) (7¾) Oy Kolster Ah (5¾) Method of manufacturing a tank - Förfarande för framställning av en behällare a method of manufacturing a container, comprising placing a paper or cardboard blank between a core tool of a injection molding machine and an onion tool, forming a blank core to receive the blank and forcing the blank into its final finished container shape; in its final shape, which is curved at least in part.

Our British Patent No. 1,320,370 describes a multi-part container in which one blank forms a circumferential wall. and the injection mold forms a seam between the two parallel edges of the preform, completing the circumferential wall, and the seam is between the preform and the end closure means and the lip is around the open end of the container, keeping the extrudate in the desired shape.

In our Finnish application No. 313 ^ / 73 we have described a device as defined in our claims for producing a container from a blank containing an end panel from which the side panels extend. These side panels are bent relative to the end panel and the parallel sides and side panel edges of the adjacent side panels are joined together by injection molding near the end panel.

59357

It has been found that if the seam or seams force the blank to form a circumferential wall or part thereof into a curved shape, the more flexible the paperboard or cardboard, the greater the stress on the seams to retain the blank in the desired shape, which may break and / or bond the preform. or the blank may have a tendency to deform from the desired circular cross-sectional shape of the container.

The method according to the invention is mainly characterized in that the bevel tool is provided with recesses into which the material of the curved part of the blank penetrates when the tools are opened, in order to reduce the inherent flexibility of the material which tends to return the blank to its original state.

Po. For ease of understanding of the invention, an embodiment thereof will now be described, by way of example only, with reference to the accompanying drawing, in which: Figure 1 shows a plan view of a blank, and Figure 2 shows an enlarged cross-sectional view of a part of a blank between two mold tools.

The blank is any suitable material, such as paperboard, and is preferably as shown and described in Finnish Patent Application No. 39 ^ / 73, which is similar to British Application No. 1 ^ 016/73. Such a blank comprises a bottom or end panel 1 and two side panels 2. The connection between each side panel and the bottom panel is cut at 26, as described in the full description of application No. 39/73 with reference to Figure 3. The purpose is to provide two hinge parts, at each of which the blank can be bent around the edge of the core tool head. As a result of the cut, a part of the base panel is cut off when the blank is bent, with the advantage that the blank can be forced against the onion tool by means of a material injected, which thus does not reach the outer surface of the blank.

When the blank is to be molded, the machine shown in our application No. 313 ^ / 73 mentioned above is preferably used. As described and shown in the full description of this application with reference to Figure 3, the blank is directed to a position with the base panel in front of the core end of the core tool shown at 10 in this figure. As the core is advanced toward the split onion tool 1, 15, the blank bends and the split onion tools come together without relative axial movement between the core tool and the onion tool during the closing steps.

When the tools are closed together, they press firmly against the inner and outer surfaces of the blank, so that in the beer of each pair of seams to be sealed, the blank closes the space between the core tool and each of the onion tools.

To reduce the inherent flexibility of the blank, one of the tools is provided with means for changing the material. In the case shown in Figure 2, the 3 59357 core tool k is provided with very narrow and low channels 5 · Excessive material of the blank which remains on its concave surface due to bending and which bending tends to compress will be compressed in the channels, reducing the force of such compression. flat mode. This reduces the strain on the axial seams in the finished product. One such seam is shown at 6 and includes a leg 7 between the panel edges and two branches 8 on top of the seamed panels. Each branch 8 has an enlarged cross-sectional part 9 at points spaced outwards from the seam branch 7. As described in Finnish application No. 751559 »the preferred pathways for the injected material flowing along the seam area are thus obtained. The injected material follows the preferred passageways, presses the blank firmly against the onion tool in the region of each preferred flow path, and then flows circumferentially out of the preferred flow paths into the region of the branch 7 where it does not penetrate the outer surface of the blank, as this surface is already tightly pressed

The method and apparatus described above have provided an efficient and inexpensive solution to a problem that could otherwise result in an excessive amount of waste. The preform material is processed without further processing, and the smooth outer surface of the preform, which is usually printed before the container is formed, remains neat and intact. It is clear that the invention is not limited to the manufacture of a container from a single blank, but also includes containers formed from several blanks.