DE102008018181A1 - Resin mold for producing molded bodies from particle foams, has supporting forms surrounding resin mold and made of insulating material and metal, where resin mold is made of heat-resistant plastic - Google Patents

Abstract

The resin mold (1) has supporting forms (7) surrounding the resin mold and made of insulating material and metal, where the resin mold is made of heat-resistant plastic. The resin mold is perforated with boreholes or slots (3), so that the mold is permeable to dampness. The supporting forms can be continuously and separately heated by heating channels (8), where the mold is milled from a finished plastic block.

Description

It is known for the production of EPS, EPE and EPP moldings used aluminum molds become. These forms usually consist of two parts, the closed and opened with mechanically working machines. In the closed forms, the pearl-shaped material is blown. The aluminum or other metal forms are perforated with so-called nozzles. After filling the forms with the pearl-shaped Material are heated forms and material. In the heating process created by the steam condensate. The main condensate Stir from heating of the metal molds. Part of this condensate gets into the mold space flushed and wet the filled Material. Shape and material is heated until the beads expand and glue each other together. It creates a foam body after the shape of the mold used. The heating must be as long as possible continued be until the trapped condensate between the beads largely turned back into steam. Thereafter, the cooling of the Shape. The metal mold is from the back with cooling water sprayed. Subsequently Mold and material are placed under vacuum to dissipate energy and at the same time to achieve a rapid pressure reduction in the material.

Disadvantages of the prior art

• 1. High energy consumption through heating and cooling down the metal forms
• 2. High condensate water content inside the molded parts
• 3. To cool the metal molds cooling water is necessary.
• 4. The cooling water will be open to the back the forms sprayed.
• 5. The cooling water It quickly becomes aggressive and needs to be constantly updated with chemical agents be treated to strong corrosion on all metal parts to avoid

Object of the invention

• 1. die hohen Energieverbräuche reduziert
• 2. die Heiz- und Kühlwechsel der Metallformen eliminiert
• 3. die freie Wassersprühkühlung eliminiert
• 4. nur die geringe Energie zum Expandieren und Versintern der Schaumperlen bedarf.

A system should be developed, soft :,

• 1. Reduces the high energy consumption
• 2. eliminates the heating and cooling changes of the metal molds
• 3. eliminates the free water spray cooling
• 4. Only the low energy needed to expand and sinter the foam beads.

Advantages of the invention

• 1. The KS system has as its main advantage high Reduction of energy consumption.
• 2. The KS system has only slight temperature fluctuations between the heating and cooling phases.
• 3. To cool the foam moldings is only the evaporation of the residual condensate while the vacuum phase used.
• 4. It is omitted an additional Cooling with external cooling water.
• 5. No additional Water installations are neither in the machine nor in the form necessary.
• 6. Cycle time reduction by rapidly reducing the pressure within the foam part due to low residual condensate inclusions.

Generally

Around To achieve a high energy saving, the metal forms should be replaced by a KS system. It is known that metal molds are preferable made of aluminum currently the shaping of the foam parts accomplish. These molds are equipped with so-called nozzles to make them vapor-permeable do. These forms are used in steam chambers. At each Working cycle, the molds are heated from about 70 ° C to 105 ° C for EPS, with EPP up to 140 ° C and then back to 70 ° C cooled. The object of the invention is to reduce these high energy consumption. The problem is solved by the KS system. For the KS system forms are heat resistant insulating Plastic products used. Supporting molds of metal or plastic can increase the strength. Metallic support forms without insulation to the KS system can be additionally heated.

Description (see 1 and 2 )

The plastic mold Pos. 1 is either milled from a finished plastic block to obtain the desired contours or cast against a previously made model, then the shape with holes or slots Pos. 3 perforated so that it becomes vapor permeable. Between the back of the mold and the support form, distances pos. 5 provided so that the steam through this space Pos. 4 the mold can flow around evenly and likewise a uniform entry of steam into the filled bead material Pos. 2 is reached. During the cooling phase the steam is switched off and vacuum is applied. In the vacuum cooling phase, the residual condensate at re-evaporation in the negative pressure serves as cooling.

For the construction of the molds Pos. 1 and the support forms Pos. 6 mainly materials are used, which absorb only low energy during vapor deposition. As a result, only a small amount of condensate falls on. In the Kühlpahse this small amount of condensate is evaporated again by the applied vacuum.

When using metal supports Pos. 7 It may be advantageous if these molds are continuously heated separately. (eg through heating channels Pos. 8th ) This serves above all a uniform steaming temperature. Optimal isolation to the outside increases the total energy consumption only slightly (see sketches).

Claims (4)

For producing moldings from particle foams by foaming with steam in molds characterized in that these forms are made of heat-resistant plastic. Plastic molds according to claim 1, characterized that they are perforated to be vapor permeable. Plastic molds characterized in that they are surrounded by support molds made of insulating material. 1 Plastic molds characterized in that the support shapes are made of metal and can be heated in addition. 2