JPH0450885B2 - - Google Patents

Abstract

1. A power press for the manufacture of stamped profiled bodies from a non-rising mixture of fibrous materials mixed with a thermosetting bonding agent, which comprises at least one inner pressing tool part (4) that is shaped in accordance with one side of the profiled body to be stamped, and one outer pressing tool part (3) that extends over said inner pressing tool part, characterized in that the inner edge of the outer pressing tool part (3) facing the inner pressing tool part (4), forms an outwardly sloped slanting surface (7) which is at an acute angle with the stamping direction as well the lateral boundary surface of said inner pressing tool part (4), which is followed the outside by a horizontal surface (8).

Description

DETAILED DESCRIPTION OF THE INVENTION The invention provides at least one internal mold part formed in accordance with the profile to be molded and an external mold part which grips the internal mold part from above. non-intumescent of fiber materials mixed with thermosetting binders with mold parts for
This invention relates to a molding machine for producing molded deformed objects from compounds.

This type of molding machine is known (West German patent no.
2548739 specification). The molding machine is used for molding irregular shaped objects, such as exterior and interior profiles of high-rise buildings, balcony veneers, table boards, etc., made of non-expansive compounds of fibrous materials mixed with thermosetting binders. used for.

Non-intumescent compounds usually consist of lignocellulose-containing fibrous materials, such as ground dry chips, bagasse fibers, etc., mixed with thermosetting synthetic resins, such as melamine, urea-formaldehyde or phenol-formaldehyde resins. However, instead of the pulverized and dried wood or bagasse fibers, fibers of other materials, such as glass fibers, rock wool or asbestos fibers, may also be used, alone or mixed with several of these fibers, using suitable, preferably organic Ground and dried wood or bagasse fibers with added binders may also be used.

A shaped object is generally manufactured as follows: first, the lower surface (the surface of the shaped object that is not used as an external surface) is formed from a compound by low-temperature molding.
A preform is produced which is provided with a covering layer.
For this purpose, a preform is formed from the compound in a molding machine, which already closely resembles the finished profile object. During the preforming of this profile, the preform is already a stable and handleable object, although the amount of heat required for curing the thermosetting binder is not supplied to the preform.

The finished profile is obtained from the preform by thermoforming in another molding machine. During thermoforming, the profiled objects are generally simultaneously coated with a covering layer, which usually consists of at least one layer, ie a decorative layer consisting of, for example, a fabric, a veneer veneer, a printed paper sheet or a plastic sheet, on which a transparent protective layer may also be arranged.
will be provided. As the protective layer, so-called overlay papers are usually used, which consist of unfilled alpha-cellulose paper or glass fiber nonwovens impregnated with Duroplast, which is usually based on melamine. The transparent protective layer may also be produced by the decorative layer having a fairly thick resin layer.

The known molding machines have proven to be widely advantageous in the production of the profiled objects mentioned at the outset. However, it has sometimes been observed that the edges of the completed profile objects have a rough surface and an optically unsightly appearance. In the case of known molding machines, the edges of the outer and inner mold parts that slide against each other during molding are opposed at right angles, so that the mold parts do not crush and shear the preform and the coating layer when completed. It was assumed that it would have an effect.

The basis of the invention is therefore to create a molding machine for producing profiled objects of the type mentioned at the outset, which provides the profiled objects with perfectly smooth and even edges.

This problem can be solved by the present invention, in which the inner periphery of the outer mold part facing the inner mold part forms an outwardly inclined slope that forms an acute angle with respect to the molding direction, and This problem is solved in that the horizontal surfaces are connected to each other and the edges of the internal mold part have a raised peak.

Next, the present invention will be explained in detail with reference to the drawings.

The drawing shows a (largely schematic) cross-section of a forming machine according to the invention. The forming machine consists of a press table 1 (which in the illustrated embodiment must be fixedly arranged) and a pressure plate 2 which is movable in the direction of the arrow. An external mold part 3 is fixed to the pressure plate 2, and an internal mold part 4 is fixed to the press table 1.

The molding die is provided with the contour of the profiled object to be molded. The compression of the profiled object is determined by the thickness of the space enclosed between the outer mold and the inner mold in the final molding position.
During molding, the movement of the pressure plate 2 is limited by stops 5 and 6 which are in contact with each other in the final molding position.

In the case of a new molding machine, the inner periphery of the mold part 3 has a slope 7 in the range where the two mold parts engage vertically at the final molding position, and this further transitions to an outer horizontal surface 8. do. The area in which the outer and inner mold parts interlock and fit tightly together in the final molding position must correspond to at least the thickness reduction of the protrusion of the profile during thermoforming.

The shape of the mold part 3 has the following effect: the preform is removed from the molding machine after preforming as described above and placed in the mold part 4 of the open thermoforming machine. Since all preforms, as is well known, undergo dimensional changes after preforming, i.e. undergo an increase in volume due to the spring back of the molding material when the preforming machine is opened, the preforms must be External molding mold part 3 and internal molding mold part 4
protrudes beyond the outer dimensions of. Therefore, when the mold section 3 of the thermoforming machine is lowered onto the mold section 4 where the preform is present, the inclined surface 7 presses the protrusion of the preform without damaging the mold. Push inward continuously. For this purpose, the slope 7 must be polished and have as smooth a surface as possible. The height and slope of the slope depend on the shape of the irregular object and can be found by simple tests if necessary.

It can also be seen from the drawing that the internal mold section 4 has a raised edge 9. This pointed edge acts as a cutting edge or punching edge when closing the molding machine and provides a clean separation between the molded profile object part inside the molding machine and the separated protruding part outside the molding machine.

Furthermore, it can be seen from the drawings that in the case of the molding machine according to the invention, the periphery of the external mold part 3 has a step 10 between the horizontal surface 8 and the outer edge. This measure advantageously has the following effect: adhesion of the protruding parts of the covering layer to the external mold part 3 is prevented and the cleaning of this mold part is at least reduced, if not significantly omitted. .

In the molding machine according to the present invention, the internal mold section 4 is fixed, and the external mold section 3 is vertically movable. However, it does not matter in principle which mold part acts on the molding material from above with respect to the other mold part. Similarly, the internal mold part 4 may be formed so as to be movable upwards or may be arranged above, or both mold parts may be arranged so as to be movable relative to each other.

Although the invention has been described above with respect to a type of machine in which core curing and coating layer application occur simultaneously during thermoforming, the new machine also seeks to simply thermoform a profiled object. In other words, it can also be used when trying to harden. The novel molding machine can also be used if the thermoforming is carried out in two stages, as is known from known molding machines.

[Brief explanation of the drawing]

The drawing is a schematic cross-sectional view of a molding machine according to the present invention: 3...external mold part, 4...inner mold part, 7...slope, 8...horizontal surface, 9...rise Apical edge, 10 steps.

Claims (1)

[Scope of Claims] 1. At least one internal mold part formed corresponding to the irregularly shaped object to be molded, and an external mold part that grips the internal mold part from above.
In a molding machine for producing a molded profile from a non-expandable compound of fibrous material mixed with a thermosetting binder, the inner periphery of the outer mold part 3 facing the inner mold part 4 is A slope 7 which forms an acute angle with respect to the molding direction and slopes outward is formed, and a horizontal surface 8 is connected to the slope outward, and the edge of the internal mold part 4 rises and has a pointed edge 9. The above-mentioned molding machine is characterized in that: 2. The molding machine according to claim 1, wherein the edge of the external mold part 3 has a step 10 between the horizontal surface 8 and the outer edge. 3. The molding machine according to claim 1 or 2, wherein the surface of the slope is polished. 4. Any one of claims 1 to 3, wherein the section where the external and internal mold parts engage vertically in the final molding position corresponds to at least the reduced thickness part of the protruding part of the irregularly shaped object. The molding machine described.