DE1729546A1 - Mold for use in a cold press molding process - Google Patents

Description

dr. MÜLLER-BORE dipl.-ing. GRALFS

DIPL.-PHYS. DR. MANITZ DIPL.-CHEM. DR. DEUFEL PATENT LAWYERS

Braunschweig, February 1st, 1968 Al / Rö - B 600

British Industrial Plastics LLmited Asbestos Iiouse,
77/79 Polin tain Jtreet iiianeheEJtor 2, England

Pona for use with a cold press former travel

; ^: 'ri ori b'it: Great Britain from 6th fi'»brn'ir l ^c ) 6 ^r) -! fr. 5 ^ * Great Britain 'rom' B.Februnr 1 ^ 6? - No. 6717/67 Great Britain dated '- "^. September K) GV- ¹ Jr. -VW0 / 67

The tarfirutun _o refers bLc; h to payment arrangements and to uie use of such arrangements in the KaIt-P reij forms of faaerverti tjat'icben Kuna tu tuff ^ egem; stand.

Ja a UuL tpreßforirr / fifiuhfon ii-ib ein erut kurülicili enb-

v / icKelfcüU VeL'L "liirtüi>; u ι! oL'hiea vm / ertitaricten Kunst-"

ütofr.rjii, · zum iieiapiei τ-> ιι i-jiaofaaurvertjtHriitun un ^ eaatbi ^ ton VoLyeator- und i'lpo ^ ydtL-iraen. UuLioiuj Kaib- \ iViiiiluvmvi: i'liuii'tiU 7ur.'v / fiu: ifin aUi forms' //// ·, ·: i l <; iohb yorfotmbnre il'ormtiaL fbon (ober- ιΐηΊ Un TürL'ona), dto ihrtif ;; ti i tu a ι u ·; ciiner \ '·> 1. / <;;) bur- or llfio.i / dlinr;' (! ruJ.:tj ίΐυί " _: _ '/ ο'ϋ ht-ί i. L b,; Lü (i and balance υ in ·: / crhiL tüiiüirUi L, iua ,. li./■ ":

ϊιίΐ>. : .JL (., ;; «lU.i iUjti) ti, til.i lit ', it 1 it I'i'i - L''i ll iw (. ·) Γ t" - i i-.i !. i ·: u • Mi. V '..! ι, .- ;; 1' him I. ii ".r - .. U; .ι. ι t. : ι ■ ti ■>, (■ =; it | '· .: t. ru; |,';j'.i ■■ - - 1, \.

.in ί,

BAD ORIGINAL 109828/1 567

The principle of the Kaltpreßiormens consists essentially therein ,, the heat generated during exothermic curing of a suitable resin rKa.talysator mass is developed, Accelerating the hardening of the resin in the way take advantage of the fact that soy.! el heat as possible in the fitting is being held. The heat is kept in the mold between the pressing processes, so that the temperature all-. gradually increases. Even if this method, as a cold press molding method is referred to, it is customary to provide some Neizeinrichtung in. The form, for example a network of resistance wires.

In practice, the reinforcement, which is usually represented by a glass fiber mat, is roughly cut into the shape of the finished molding and then possibly after a first gel coating of resin has been applied to one or both mold halves - in _; jiie _{i; i} form (usually in the lower form) inserted in such a way that; the edges of the .glass fiber mat the edges of the mold ;. , overlap and are therefore clamped when the form is closed by the trade · of the Jonii. .The parts of the form that cover the protruding edges, the reinforcement .. and. at the same time - the edges of the fo fm hollow spaces th bLegtiii, are in the following to be used as tape edge strips! bü '^ ululiutit v / tJi'iien. iJatin-'is · eina' geeiiinet.e lUonge unit) ίζϊ: ϋ Lj'tui t.ou itfititil.yi-ϊ iortuii hartieu la the form brought in,

which is then closed. Finally, a corresponding pressure is applied and it takes place Curing of the resin "to the point where the resin has become so hard that it can be used without the risk of any unwanted deformation can be taken out of the mold. It is clear that because of the presence the reinforcement layer in the small area at the edge of the Form a tight closure of the Porm, as it is with a Metal form can be achieved in which the projecting reinforcement s chi chi; is separated is not possible; gaps or spaces remain free, so that it is not uncommon for an excessive leakage of resin through the pinch-off area occurs. Furthermore, if the reinforcement layer wrinkles or wrinkles, like it Occasionally it can occur when an intricate molding is to be made and the reinforcement layer cannot be cut to size rests smoothly on the pinch-off edge, excessive pressure is exerted on the pinch-off edge in the area of the folds which often leads to a break in the shape at this point. They are already very complicated clamping devices have been suggested that range from sharply angled areas to steel strips that are embedded in the molds and, for example, in an article in "Reinforced Plastics" (Sept. 1965, steps 15 to 20).

109828/1567

There are further disadvantages of the usual cold forming processes in that the forms are often very heavy, up to a few hundred kg when using concrete as Document; this already applies to forms with only moderate dimensions. Accordingly, they are large and unwieldy Facilities for hand lifting these forms are required.

^ The present invention has improved forms for Objective that can be used in the cold press molding process.

It has been found that you can get a better shape obtained when at least part of the clamping surface of the mold is made of a suitable resilient material is.

The nature of this resilient material depends on the extent the required compression as well as the temperatures and chemicals that the material can withstand must

The extent to which the material is compressible The disconnection area can change within wide limits · With given requirements and known properties of the available material, however, there are no difficulties for one skilled in the art, one for the particular one To select suitable material for the purpose. It has

109828/1567

pointed out that rubber, either natural rubber if this is sometimes not suitable because of the chemical attack - or synthetic rubber one form a wide range of useful materials from which pinch-off strips can be made. A hardness of 10 to 100 ° Shore is suitable; the hardness is preferably in the range from 50 to 80 Shore chosen. In particular, neoprene is about 75 Shore ^

Suitable for hardness.

The clamping device preferably consists of a pack or a narrow strip of a flexible one Material suitably placed around the edge of the mold, and often in addition to it serves to set the limit for the fitting. If such a strip also simply by gluing can be attached to the mold, it is preferably inserted into a shallow groove that runs into the Material of the form is incorporated. In this groove, the strip is preferably by an adhesive in its Location held. An epoxy resin adhesive has been found to be very useful for this purpose, however there are, of course, a large number of adhesives so that the selection of a suitable adhesive can be found does not cause any difficulties.

This flexible pinch-off rim can either be a 1098 2 8/1567

both form the two-part form. Embodiments for these two possibilities are shown in the drawing to be explained later.

It has been found that the use of a resilient pinch-off edge as explained in this respect by The advantage is that this prevents uneven leakage of resin from the filled mold when Pressure is applied to the mold. By means of a resilient pinch-off wall made of a strongly compressible one Material and with a pinch-off edge that is thicker than the shaped piece is to be later, a pinch off the edges of the molded pieces already reached before a noticeable pressure on the material in the mold cavity is exercised. Due to the pressure acting on the mold and thus on the pinch-off edge, this only becomes pressed together.

It has already been mentioned that the usual concrete-backed forms are often very heavy and unwieldy are. Ss has now surprisingly turned out that it is entirely possible to make the molds from a suitably strong plastic without a stiffening one To use underlay. For this purpose a glass fiber reinforced polyester compound is special suitable, the Torrn so diok or so formed is (for example by attaching ribs that

10982 «/ 1567

they have sufficient rigidity for use in the press molding process owns. Such a shape should because it is compared to that usually in the cold press molding process Forms used have a relatively small wall thickness, are referred to as a shell shape.

If necessary, the rigidity of the shell shape

are increased by suitably j

by means of screws engaging through flanges on one

Support frame is attached, which is made of steel girders

may exist, which represent part of a press in which the molds are used in operation.

The actual thickness of the mold depends on the size
and shape of the form; In the case of a simple two-part mold made of fiberglass-reinforced polyester for a rectangular bowl with the dimensions 75om χ 45 cm 15 cm, a thickness of 6 to 12 mm has been found to be sufficient for both ^ mold halves. The fat
the shape can be determined for each individual case simply by means of an experiment.

In the case of a simple form, as explained above, it is perfectly sufficient that only the longitudinal sides of the form are supported with support beams, however
in the case of more complex or larger shapes,

109828/1567

- ⁸ - 17295A6

It may be desirable to provide further support surfaces, which are represented, for example, by carriers that run below the mold or are attached to flanges on all sides of the mold. The support brackets can be adjustable to allow the use of shapes of different dimensions and enable design.

It has also been found that it can occasionally be advantageous to use foamed plastics as To use base for the shell molds according to the invention, which are made in this way deposited Molds are relatively light and have desirable thermal properties.

Typically, low strength foams are used to back up rigid mold jackets that can retain their shape under the molding conditions. Stronger and denser foams, for example polyurethane foams with densities of more than 25 to 50 kg / m ^ and in particular more than 75 or even 100 kg / m ^5, have been used in connection with relatively easily deformable shell shapes made of very thin polyester resin-glass fiber Sohichtstoffe or made of epoxy resins. The less dense, weaker foams can also provide support

109828/1567

request, which is done, for example, by placing them in a suitable box from, for example Wood can be enclosed, albeit a simple frame, which can e.g. consist of angle iron has been found to be satisfactory in the case of the stronger and denser foams. With the stronger ones Foaming, for example with polyurethane foam

a density of 100 or 125 kg / m or more, it was J

possible to attach the Bio eic aas foam directly to a suitable To screw on or clamp the form framework.

Another modification of the invention is that when using a sufficiently dense and strong Foam, for example a polyurethane foam with a density between 75 and 500 kg / m, preferably between 100 and 250 kg / m, the foam itself is used as a mold without the above explanation

terte shell shape would be required. A very considerable one Advantage of using a foam mold without the shell shape or with just a very thin one Molded lining, which itself has anti-adhesive properties has, is that the production of the mold, which is very time consuming and expensive, cheaper and can be accelerated because the form is simply in the It is produced in such a way that the uncured foam or the foam-forming liquid is applied to the model

109828/1567

is applied and then the foam until it is reached the solid state is cured.

Choosing a suitable plastic foam with for the intended purpose of suitable density brings no difficulties for the person skilled in the art, if only the conditions under which the form is used are known. It should be remembered that the as polyester cured, heat developed the foam to melt or at least deform can bring .. Further influences the speed of hardening, the type of catalyst, des.accelerator etc. the amount of heat released. It may be desirable to use the foam molds according to the invention for example to stiffen that in the foam state stiffening material, such as Glass fibers, natural fibers such as wool fibers or synthetic fibers such as rayon is introduced. It turned out that thermosetting plastic foams such as polyurethane, silicone and epoxy foams are very suitable.

Conventional release agents such as polyvinyl alcohol and wax can be used in the molds according to the invention} for foam molds that are used without a mold liner it may be possible to dispense with the use of a release agent completely, as the

109828/1567

The surface of the foam itself has properties that prevent it from sticking. This applies to, for example Polyurethane and silicone foam. A permanent release agent can also be incorporated into the mold, for example by coating with a release agent that chemically reacts with the surface of the porm. By the Spreading a polyvinyl alcohol solution on the model before the uncured foam J is applied, a long-lasting coating of polyvinyl alcohol is applied applied to the surfaces of the polyurethane mold. Between the polyvinyl alcohol and the isocyanate groups a reaction then takes place in the foam.

In general, it can be stated that the novel shell molds and the foam or foam-backed molds according to the invention have a heat capacity of less than 0.4, preferably less than 0.3 and, if possible, less than 0.15 cal / cm / ⁰ C and a thermal conductivity of less than 0.002, preferably less than 0.0015 and, if possible, less than 0.001 cal / cm / sec / cm / G should have.

The invention is illustrated by way of example in the accompanying drawings and will be described in detail below explained.

Figure 1 is a perspective view of an upper, 109828/1567

the die forming the die.

Fig. 2 shows a perspective view of a lower mold which is fastened to support beams with screws.

Figure 3 is a vertical section through part

a closed mold, which is composed of the mold halves ^ of FIGS.

FIG. 4 shows, in perspective, a part of a molded piece produced with the form of FIG. 3.

The mold halves 1 and 3 »shown in FIGS. 1 and 2 are hurried, are prepared in the following way. After the model for the lower mold has been formed in the desired shape and the surface has been applied of different coatings of air-drying Furan resin with respective sanding between the coatings and coating of the smooth surface with a common polyvinyl alcohol solvent a thin first layer of a coarse isophthalic resin about 0.0125 cm thick is applied. The layer is hardened, after which a cut layer of a surface fabric is inserted. A second layer is then applied and fully cured. The amount of gel layer is just enough

109828/1567

around. to bring about a good moistening of the tissue. the Form is then brought to its full thickness, with usual mats made of staple fibers and one for general Purposes used unsaturated polyester resin with high heat resistance can be used. To any stiffening ribs can solidify even if they are not used in the present example - be attached in the appropriate places. -

When the mold half 5 is fully cured, it is from The model was removed, whereupon the edges were cleaned and the pinch-off edge strip 4 was inserted into a groove provided will. Wax is then introduced into the lower mold with a thickness that corresponds to the thickness of the one to be produced Fitting corresponds, whereupon the wax on the Upper mold is made in the usual way.

After the mold has hardened for around 2 to 3 days

w holes 2 for the retaining screws and - if he ^ Required - auxiliary holes for guide pins, which are used to align the mold halves, in the side Flanges drilled.

The Forrahalften shown in Fig. 1 and 2 are used for the production of bowls, the dimensions of about 75 cm 45 cm 15 cm, each of the mold halves produced in the manner explained has a wall thickness of about 6 mm.

109828/1567

Furthermore, the flexible pinch-off edge strip 4 can be seen in FIG. 2, which in this case is made of neoprene with 75 ° Shore hardness, has a width of 9 mm and in the uncompressed state protrudes about 6 mm upwards over the edge of the mold. The pinch-off edge strip is inserted into a groove, in the present case only one area of the edge strip consists of a resilient material. The pinch-off margin defines the boundary of the mold cavity and thus also of the molded piece, as can be seen from a consideration of FIGS. 3 and 4. In Fig. 3, the shell shapes 1 and 2 shows in use, the mold cavity is provided with a mass 6 in the usual manner made of glass fibers, unsaturated resin and a catalyst, whereby the pinch-off seated in the groove edge strips 4, the fiberglass mat, the protruding end is shown at 7, pinched so that they are firmly is held in place without causing excessive Amount of resin is lost. The appearance of a portion of the blank that has been removed from the mold is apparent from Fig. 4, in which the reference numeral 9 denotes the part of the molding compound, which is pressed together by the pinch-off strip, while with 7 the protruding end of the fiberglass mat is referred to. The fitting is made by cleaning the

109828/1567

Edges finished, usually by cutting off parts 9 and 7. The support beams 5, which can be seen in section in Fig. 3 and are screwed to the mold halves 1 and 3, are devices, with which the mold halves are held in the press, which can be of conventional design. In the present Trap a simple hydraulic press was used.

The use of resilient pinch-off edge strips has been explained in connection with shell shapes, but the application is not limited to these types of shapes. The pinch-off edge strips can also be used with the usual forms for the cold-pressing process or with any of the novel shapes discussed in this specification can be used.

Difficulties have been found in the cold press molding process when using this process for molding Deep-drawn objects is used, such as for containers and similarly shaped objects.

One of the main reasons for these difficulties is that the reinforcement layer tends to shift when as a result of closing the mold occurring pressure the resin begins to flow. It has been found that by using

1 09828/1587

appropriately arranged pinch-off edge strips for holding the reinforcing layer, including deep-drawn objects produced by means of the cold pressing process can be. This application of the invention will be explained using two examples. In the first case, it should a sleeve can be made which is attached to the end of a concrete pipe for easy connection with another ear to allow. In the other case, a deep-drawn container should be produced, whose side surfaces and bottom consist of one piece

Figures 5, 6 and 7 leave these uses a recognize the invention.

Pig. Figure 5 shows a vertical section through the parts a shell shape that is circular in plan view.

Figure 6 is a vertical section through this shape closing.

Fig. 7 shows a modification in a vertical section part of the shape illustrated in FIG.

To produce a deep-drawn sleeve, a shell shape is used, as shown in FIGS. 5 and 6, but the principles explained can also be used in conventional molding techniques .

109828/1567

The mold shown is in three parts and has a lower mold 14, an overmold or a punch 13 and a retaining disk 15. Three neoprene rings 10, 11 and 12 are inserted into these moldings, but they protrude slightly beyond the edges of the molds. The rings are in the form of a circular ring, the rings 10 and 11 being arranged so that they meet when the mold is closed. In doing so, they form a pinch-off edge - μ

strip that puts the fiberglass layer in the right place Holds position and defines the limit of the shape, while the ring 12 is a bearing surface for the retaining disk forms when this assumes its final position in the lower mold.

When using the mold shown in FIGS. 5 and 6 for producing a glass fiber reinforced sleeve After applying a cutting agent to the mold surfaces, a strip of glass fiber mat is used desired weight and desired thickness in the mold, as shown in the drawing, with one edge the mat is placed over the pinch ring 11, while the the other end is arranged so that it falls over the pinch-off ring 12. Then the retaining plate 15 is in the brought position shown in Fig. 6, so that the (xlasfaeer reinforcement between the Abklemmring 12 and the disc 15 is held. Then will

109828/1567

an appropriate amount of a catalyzed one Resin of the desired kind poured into the mold »then the punch 13 is used, which - if necessary - is guided by suitable guide devices is, for example, by pins not shown. The shape is then, with the application of pressure closed to the position shown in FIG. 6, the pinch-off rings 10 and 11 coming together and further closing of the mold parts 13 and 14 is prevented in that the mold half 13 is open to support the disk 15 comes. The clamping rings grip and hold the fiberglass reinforcement in the correct position and substantially prevent resin from leaking out of the mold. Then the resin-fiberglass mass 6 is left Harden. After hardening, the mold is opened, the molded piece and the protruding resin are removed and cut off the fiberglass mat.

Fig. 7 shows a modification of this form, the retaining disk 15 differently from FIGS. 5 and 6 so it is thin that a gap remains between the disc and the punch 13 when the shape is completely drilled Has taken a position. This gap is to receive a layer of resin and glass fiber certainly. In this way, a deep-drawn container can be produced in the following manner.

109826/1567

A strip of fiberglass mat is molded into the mold as explained above for the manufacture of the sleeve inserted along the wall, up / down the retaining disk is brought into its position as before. Then it will be a circular disk made of a glass fiber mat is placed over the retaining disk, the edges of which correspond to the edges of the Overlap the fiberglass strips already inserted in the mold. This is in Pig. 7, in which the glass fiber strip is held in place by the edge of the retaining disk 15 will. Then the resin provided with the catalyst is again poured into the form and this under Pressure closed until the resin has hardened sufficiently. In this way, a container with a molded Soil can be obtained after the excess fiberglass and resin material is separated.

Another difficulty with the cold press molding process is placing inserts in fittings. It has "

found that the pouring of inserts into fittings during the cold press molding process thereby it becomes possible that suitable anchors are provided for the inserts in the forms used, so that the parts to be attached protrude from the mold wall into the mold cavity and in this way into the Form piece are used.

One embodiment is shown in Figures 8 and 9 of 109828/1567

Drawing illustrates.

Fig. 8 shows a section through a mold in the closed position.

Fig. 9 shows a part of the pig enlarged. 8th.

Fig. 8. Shows a cold press mold (the invention can in this case also either with the usual stored forms or with the novel forms explained above) in the closed state » i.e. the state in which the mold halves 20 and 21 are in the mold position and the mold with a Mass 6 is filled from a polyester resin provided with a catalyst and a glass fiber reinforced ^. as Pinch-off edge strips, abutting rubber pinch-off rings 10 and 11 are used.

Holders 22 made of a suitable, flexible material are molded into the wall of the mold and are arranged in this way are that their surfaces are flush with the inner surface of the mold. These holders have holes in which Inserts are held during the molding process " For small operations, such as small adjustment approaches, have been successfully preparing laboratory rubber stoppers used as a holder. During the molding process

109828/1567

For example, the insert is retained in the holder, as illustrated in FIG. 9, and then the reinforcing layer and resin is applied over and around the insert so that it is retained in the molding. Then the mold is closed and the fitting is after sufficient. Hardening removed from the mold, with the inserts stuck in the molding and being pulled out of the flexible holders. _Λ

It has occasionally been found to be beneficial in order to. the inserts around additional stiffening material to reduce the possibility of pulling out the inserts from the fittings.

The option described is not limited to small stakes. Larger stakes can be placed on the hold the same way, using flexible holders which are shaped so that the temporarily held therein Insert can be easily pulled out when the fitting is removed «, into the sides of molding inserts have been cast in such a way that a sufficiently large part of the wall of the mold is made of a suitable flexible material so that the insert can be withdrawn from the holder was possible

The material of the holder must of course be without substantial 109828/1 567

Change can withstand the conditions occurring during the molding process. As with the pinch-off edge strips Even when choosing a suitable material for the holder, choosing is not difficult if the necessary Properties like flexibility, temperature and chemical resistance are known. It turned out that rubber, and in particular synthetic rubber, is very suitable. The keeper will of course, usually held in a suitably formed recess in the wall, such as it in Pig. 9 can be seen.

example 1

A glass fiber reinforced polyester bowl was produced, in which with shapes according to the Fig. and 2 was done in the following manner. The mold halves were made of the unsaturated polyester resin Beetle 4128 and had a thermal capacity of 0.24 cal / cm / C and a thermal conductivity from 0.0008 cla / cm / sec / cm / ° C.

The mold halves were held in mold frames that each from a right-angled, open, box-like

Frame made of angle iron. These frameworks formed part of a hydraulic press with which

109828/1567

the mold halves could be brought together under a suitable pressure to produce the molding. The "pressure applied in the cold press molding process is usually on the order of 0.1 to 5.0

ρ
kp / cm of the developed area of the fitting. The lower mold half was attached to the lower mold frame.

A solution of polyvinyl alcohol was brushed onto the effective surfaces of the mold halves, whereupon then a layer of glass fiber mat (2 oz / sq. ft. equivalent to 0.061 g / cm) of a suitable size in the lower mold was inserted, the edges of which covered the pinch-off edge strips. 800 g of the catalyzed resin that comes from equal parts by weight of the Beetle 851 and Beetle 4128 as well 4 percent by weight of a 50% benzoyl peroxide mass were poured into the lower half of the mold and spread over the mat with a spatula. The mold halves were brought together and pressed for about 10 minutes, after which the mold was opened and the Fitting has been removed.

Example 2

It was made for a tea tray of about 60 cm in length and 4 cm wide formal coats made of a polyester glass fiber fabric manufactured, their thickness each only about 3 mm

10.9828 / 1567

fraud. These molded jackets were easily deformable. The shell halves were then backed with a polyurethane foam of 54 kg / m / density by pouring the commercially available foam compound onto the back of each mold half, so that after the foam had hardened, a backed shape was created, which was replaced by a rectangular one for each mold half Block with a thickness of about 10 cm was shown, on which the jacket made of the polyester-fiberglass laminate sat. The polyester parts of the mold were now stiff because of the dense bottom layer of foam and no longer easily deformable, even if the device was light.

The mold halves were then clamped to a suitable mold frame of a press, with the sides and the back of the form was held in place by strips of wood ".

The fittings were then made in the usual way, being fiberglass mats and the resin mats that Benzoyl peroxide contained ale catalyst, were entered into the lower mold after the surfaces of both Mold halves had been coated with polyvinyl alcohol as a separating agent. The time that doesn’t work with one heated mold was required to make a take out

109828M567

Achieving sufficient curing of the molding took about 3 minutes from the start of the solidification of the Hard.

Example 3

In this case, the upper and lower molds were made of polyurethane foam with a density of 110 kg / m 2. The lower mold was prepared in such a manner that A, a commercially available foam material (Bibby s EM 12 ¹⁾ was applied directly to the positive model of a tea trays of 60 cm length and 45 cm width. After the foam hardened, the rigid foam mold half was removed from the model. The upper mold was produced in the usual way by molding the foam on a model which was represented by a wax model with the finished shape of the molding which was in the lower mold. G

The upper and lower mold halves had dimensions of about 75 cm 60 cm 15 cm. The depth of the recess 4e in the tray was about 2.5 cm.

It turns out that these mold halves could be clamped directly to the mold frames of the press, without any backing or side support being required.

I i »ti 7

The molding process was carried out as in Example 1,
however, no separating agent was applied to the Eorm surfaces.

Example 4

A foam arm was produced as in Example 3, however, before applying the foam mass to the model, this with an aqueous solution was coated with polyvinyl alcohol. The coating from the separator became for a long time maintain.

10982 «/ 1567

Claims (15)

Expectations 1 .. mold for use in a cold press molding process, characterized in that the pinch-off edge strip (4,10,11,12) at least partially consists of a flexible Material. 2. Form according to claim 1, characterized in that the resilient material a natural or synthetic ™ tischer G-ummi is. 3. Form according to claim 1, characterized in that the resilient material has a hardness of 10 ° to 100 ° Shore, preferably 50 ° to 80 ° Shore. 4. Mold for use in a cold press molding process, characterized in that the mold has a thermal capacity less than 0.4 cal / cm / ⁰ C and a heat | Has conductivity less than 0.002 cal / cm / lake / cm / ° C. 5. Form according to claim 4, characterized in that the mold is made essentially of fiberglass-reinforced synthetic resin. 6. Form according to claim 5, characterized in that the form consists essentially of a glass fiber reinforced 109828/1567 Polyester roof shell with an average wall thickness of
6 to 12 mm. 7. shell mold according to claim 4, 5 or 6, characterized in that that the mold is provided with a flexible pinch-off edge strip according to claims 1, 2 or 3 is. Ψ 8. Form for use in a cold press molding process, characterized in that the form by a
Mold jacket is formed by a thermally
insulating layer made of a foamed plastic is deposited. 9. Form according to claim 8, characterized in that the base consists of hardened polyurethane, silicone, epoxy, phenol or ureaformaldehyde foam. 10. mold for use in a cold press forming process; characterized in that the shape is substantially. consists of a hardened rigid plastic foam with a density between 70 and 300 kg / m, preferably between 100 and 230 kg / m ⁵ . 11. Form according to claim 6, 9 or 10, characterized in that 'That a pinch-off edge strip according to claims 1,2 or 3 is provided. 109828/1567 12. Mold for cold press molding of deep-drawn objects made of fiber-reinforced molding compounds, characterized in that a pinch-off edge strip (10, 11) according to the Claims 1, 2 or 3 »as well as an additional clip margin (12) made of a suitable, resilient material are provided that when closed the mold hold the fiber mat in a desired position in the mold. 13 mold for use in a cold press molding process, characterized in that the mold has one or more holders (22) which temporarily have a to be molded into a molded insert (23) and are so flexible that when removing the molded piece from the mold of the insert Holder is released. 14. Process for cold pressing, characterized in that " that molds according to one of the preceding claims are used. 15. Form piece, characterized in that it is produced by a method according to claim 14. 109828/1567 Blank page