DE8528957U1 - Forming device for structural GRP - Google Patents

Description

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ll^LT-L. UN. O. OV^il/VürillV 1978 ) TELEGRAM ADDRESS PATENTIWE

date/date. 9· October

PATENTAK ¹ VaLT SCHAEFER. P.O. Box 70 15 42, D-2000 HAMBURG 70 OUR REF: KSch/E MR SIGN/YOUR REF:

Thomas Koch,

Friedrich-Ebert-Damm 58b, D-2000 Hamburg 70.

Forming device for structural GRP 10

The invention relates to a device of the type mentioned in the generic term of claim 1.

Fiberglass plastic products have a wide range of applications, such as car body parts, furniture, bathtubs. They are characterized by high strength, durability and cost advantages, especially for small series.

Known glass fibre plastic products usually have a high-gloss, smooth surface, which is, however, a disadvantage for many applications.

Such a smooth surface is sensitive to scratches of the relatively soft plastic material.

COMMERZBANK HAMBURG 22/58226 (BU 20040000) STVyj.FT,C0IJ5:,C.0i) ApE HH ' . ..' i POSTGIROL HAMBURG 225058-208 (bank code 20010020)

Any dirt also shows up very quickly. It is also a disadvantage when there is a risk of slipping, for example in bathtubs.

For many applications, it is therefore desirable to give the surface of the product a structured design. Fiberglass plastic products are always manufactured in a mold in a mold, whereby the plastic precisely forms the mold surface. If a structured surface is to be produced, the mold surface must have a corresponding negative structure. Since molds are often taken from a positive model, whereby the mold is usually also made of fiberglass plastic, the model surface can also be structured accordingly.

However, difficulties arise here, since such a structural formation of the surface of the mold or model is difficult and costly.

According to the current state of the art, the surfaces can be roughened by grinding, for example. However, a structured surface obtained in this way is too rough and therefore susceptible to dirt and usually looks unsightly. Attempts are also made to make the plastic surface of the mold or model wavy by pressing it in before it is held, again with unsatisfactory results. Prefabricated panels with a structured surface can be inserted into the mold or model, such as rough wooden panels, embossed metal panels or the like. This, however, results in difficulties at corners and edges and unsightly steps. Here too, the result is unsatisfactory. Finally, these surfaces can be etched, especially in the case of metal molds, but this is very expensive and

&Igr; is not suitable for small series.

The object of the present invention is therefore to create a device of the type mentioned at the outset which allows the production of a satisfactory structural surface with any desired shape in a simpler manner.

This object is achieved according to the invention with the features of the characterizing part of claim 1.

According to the invention, the mold or model is coated with a structural paint. Suitable structural paints are commercially available in a wide variety of structural designs and can be applied to any surface, regardless of its shape, in a very simple and inexpensive operation. Such a mold or model can therefore be produced extremely inexpensively and is therefore particularly suitable for small series. The resulting structural surface of the product is characterized by a very uniform, uniform structure, which is maintained evenly in all corners and edges, regardless of the individual shape of the product.

In particular, the aesthetic impression is exceptionally good.

The features of claim 2 are advantageous. If the model is coated with structural paint rather than the FoTm, which is subject to wear when products are molded several times, then the advantage is that this paint, which may be susceptible to wear, is only exposed to a molding process once. The molded mold made of hard plastic, for example fiberglass plastic, can then be used for molding as often as required.

of the products. In addition, the structural surface of the product is a positive image of the model surface, i.e. exactly the same as the structured paint surface.

Finally, the features of claim 3 are advantageously provided. Polyurethane structural paint has proven to be extremely suitable in tests.

The invention is shown schematically and by way of example in the drawing. It shows:

Fig. 1 a section through a model with textured paint coating,

15

Fig. 2 is a section through a mold taken from the model according to Fig. 1,

Fig. 1 removed form,

Fig. 3 is a section through a product molded from the mold according to Fig. 2 and

Fig. 4 shows an enlarged section through a variant of the form or product.

s 25 Fig· 1 shows an embodiment made of solid material

manufactured model 1, the surface of which in the example

n play in a staircase manner with a positive and a negative

edge is formed. The raw surface 2 of the model 1 is smooth. A structural coating 3 is applied to the raw surface 2 without gaps and forms a

j Structure surface 4.

From the model shown in Fig. 1, a fiberglass plastic part is made in a molding process using laminated technology.

j 35 form 5 as shown in Fig. 2. This

1 has glass fibers 6 in its interior and, during the molding process, precisely reproduces the structural surface 4 as a negative surface 7.

5 In the last step, the glass fiber plastic product 8 shown in Fig. 3 is molded from the mold 5. This again consists of glass fiber plastic with inserted fibers 6 and has the structural surface 4 of the model 1 on its surface. 1Ö

In a variant of the device according to the invention, instead of the model 1, the form 5, i.e. the negative I form, can also be coated with structural varnish, from which then

I indirectly the product 8 is molded. But then

j 15 due to frequent molding, the structural paint is subjected to higher i; stress. To produce fewer

I Evidence of a form is, however, this execution

1 form also suitable.

I 20 Fig. 4 shows a section of a typical design of a I glass fibre product or a glass fibre mould in which

\ immediately adjacent to the structure surface 4

I first apply a thin layer 9 of so-called gelcoat

I and then a thicker layer 10 made of fibers

I 25 Reinforced plastic is provided.

I Commercially available structural paints 3 can be used as suitable

; Use structural paints. In particular, structural paints

Polyurethane-based paints are suitable, such as those commercially available as 30 "Relidur PU-structure" paints from 3M. Such paints can be formed in very different structures on any surface. Other structural paints are also suitable. A certain limitation is that the structural paints are not attacked by the plastic applied in the molding process.

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graze and must also be resistant to the commonly used release waxes.

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Claims (3)

PΔP T "P XT T"&Dgr;"NI A3V &· T «&Tgr;*··* "··'···' D-2000Hamburg7o,gehölzweg2o ■ ^&Ggr;/&Lgr; - ¹¹ -'^1>1&Lgr;11 »TALI P.O. BOX 701542 DIPL. PHYS. K. SCHAEFER phone:(040)656205i (DIPL. ING. H. SCHAEFER m& ) Telegram address: patentiwe date: 9- October 1985 PATENT ATTORNEY SCHAEFER. P.O. BOX 70 15 42, D-2000 HAMBURG 70 OUR REF: KSch/E YOUR REF: 1 Udo Koch, Friedrich-Ebert-Damm 58b, D-2000 Hamburg 70. EXPECTATIONS: 1. Device for the moulding of fibreglass-10 plastic products with a structured surface, thereby characterized in that the mold (5) or the model (1) is coated with structural varnish (3). 2. Device according to claim 1, characterized in that the model (1) is coated with structural paint (3) is. 3. Device according to one of the preceding claims, characterized in that the structural paint (3) 20 a polyurethane varnish is provided. COMMERZBANK HAMBURG 22/5*226 (BU 20040000) S.W.LfiT.-CODE^COBADE HH · POSTGIROL HAMBURG 225058-208 rBLZ 20010020)