NL8502934A - METHOD FOR MANUFACTURING A HOUSEHOLD SIEVE - Google Patents

Description

I VO 7461

Title: Method for manufacturing a household sieve.

The invention relates to a method for manufacturing a household sieve with a sieve braid ... of metal wire, which is attached to a closed, plastic handle provided with a grip attachment.

In known sieves of the type referred to here, as are also described, for example, in German patent 1,268,337, the plastic runs into the sieve braid during the spraying process. The result is an optically poor-looking screen.

The object of the invention is to provide a household sieve of the above-mentioned type, wherein the plastic frame is sharply separated from the sieve braid.

This problem is solved according to the invention in that an edge region of the sieve braid is bent almost rectangular when spraying and that the tool (9, 10) for the plastic frame (2) is designed in such a way immediately after the conversion in the direction of the edge that the closing force (11) acts almost perpendicular to the edge area of the sieve braid (1) and that it is clamped positively by the two tool halves (9, 10) in at least a short area (12).

On the one hand, this method makes use of the insight that a substantially rectangular deflection works practically as a labyrinth seal and that an optimum gap width is always worked by directing the closing force vector of the tool at right angles to the second tool half. Wear phenomena on the implement are compensated for.

According to a further embodiment, the screen braid 25 and / or the tool is cooled at least in the contact area of the two tool halves, but in the narrowest labyrinth area. As a result, a rapid solidification of the plastic is achieved, with the result that the edge becomes particularly sharp-edged. The overflow of plastic in the other screen braid is thereby excluded. The household strainer manufactured with this method fully corresponds to the aesthetic feelings of the current housewife. The unsightly, uneven, filthy appearance of blending spots of the plastic is reliably avoided.

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The method for manufacturing the household screen is explained in more detail with reference to the drawings.

In it: Fig. 1 shows a longitudinal section through a household sieve, Fig. 2 shows a highly schematic section through a tool with inlaid sieve braid, Fig. 3 shows a detail section according to point III in Fig. 2 and Fig. 4 another solution for the range according to III.

The sieve braid 1 is injected into a plastic frame 2, which on one side merges into a grip extension 3 and on the other side into a support hook 3. The edge region 5 of the sieve braid 1 is stepped, that is to say, it initially has a vertical part 6, then a horizontal part 7 and then changes into the rounding 8.

In the embodiment according to Fig. 4, the vertical part 6 is omitted.

The shape of the edge region, determined, of course, by the tool construction, has the essential feature of the invention. The two tool halves 9 and 10, 9 representing the closing side and 10 the mouth-piece side, move in the direction of the arrow 11. It should be noted that it is not important which tool half forms the closing side and which forms the nozzle side. These are purely mechanical decisions, which also depend on the type of ejection construction and thus also form a technical drawing argument.

Both tool halves 9 and 10 have a short reach 12, which is perpendicular to the arrow direction. This range 12 clamps the horizontal part 7, making it practically horizontal, between them. However, this range 12 is now also perpendicular to the flow direction of the thermoplastic plastic when spraying in the mold 13 for the plastic frame 2. Thus, a labyrinth is formed for the plastic. In addition, the capillaries between the wire braid are so fine that solidification of the plastic in the short region 12 takes place very quickly and a sharp separation is created between the rounding 8 of the screen braid and the plastic frame 2. 'Because the two 35 halves of the tool in the short range 12 collide flat, also ...; ··· 2 S .1 Λ' 3 - 3 - tool wear is compensated and only one labyrinth the thickness of the thread remains. Thus, no deterioration of the spraying quality will also occur due to tool wear.

A further increase in the separation accuracy can take place by means of a corresponding cooling. To this end, both the tool cooling in the short range 12 is suitable, as is the cooling of the screen braid 1 immediately before spraying. For this purpose, for example, immersion in a cooling medium can take place.

A further refinement of the method is achieved in that the injection molding tool therefore functions both tool halves 9 and 10 simultaneously as a deep drawing tool for the screen braid 1.

The injection point for the plastic frame will expediently in any case lie in the handle extension 3 or in the support hook 4.

Claims (3)

Method for manufacturing a household sieve with a wire mesh sieve braid, which is attached to a closed plastic frame provided with a handle-grip, characterized in that an edge region of the sieve braid is converted at right angles when spraying and that the tool (9, 10) for the plastic frame (2) is designed directly under the conversion in the direction of the edge in such a way that the closing force (11) acts almost perpendicular to the edge area of the sieve braid (1) and this at least in a short area (12) is clamped in a positive manner by the two tool halves (9, 10). Method according to claim 1, characterized in that the sieve braid (1) and / or the tool (9, 10) is cooled at least in the region (12). Household sieve according to the method according to claim 1 or 2, characterized in that the edge region (5) of the sieve braid (1) is formed step-wise and the plastic frame (2) is arranged after the first conversion (14) of the sieve braid . ·? · Λ :: i