KR101149412B1 - Surface glazing molding method of reducing weight matter - Google Patents

Abstract

The present invention relates to a method for forming a surface glazing of a light weight material, comprising: filling a space between an upper mold and a lower mold with a prepared material for the light weight material; Supplying steam generated from the steam generator to melt raw materials; Supplying and cooling the coolant generated from the cooler; In the surface glazing molding method of the lightweight material comprising the step of releasing; The upper mold and the lower mold are formed with a plurality of tunnels arranged so that fluid flows along the circumference thereof, and only communicates with the tunnel only in the product inner surface forming portion, which is the outer surface of the upper mold except the product surface forming portion, which is the inner surface of the lower mold. A cap for spraying steam and coolant is installed; Glazing the surface by first supplying the high temperature / high pressure steam supplied from the steam generator to the tunnel on the product surface forming part side; After supplying steam, which is maintained at a lower temperature and pressure than the primary after the first supply to the product surface forming part, the steam is supplied to the product surface forming part and heated together with the product. Fusion to each other; After the heating is completed, the cooling water is supplied through the tunnel, but the product surface forming part is first quenched in a short time to 40 to 60 ° C. within 10 to 15 seconds, and then the both sides are cooled to 50 to 60 seconds. It provides a surface glazing molding method of a lightweight material characterized in that.
According to the present invention, the surface glazing of the lightweight material (EPP) can secure a visual and tactilely beautiful appearance even with a single material, and thus the use range is expanded, and the surface glazing is possible in one molding, thus man-hour, time, The unit price can be lowered, the weight can be further promoted due to weight reduction, and a lightweight material having sufficient stiffness and insulation / insulation function can be obtained.

Description

Surface glazing molding method of lightweight material {SURFACE GLAZING MOLDING METHOD OF REDUCING WEIGHT MATTER}

The present invention relates to a method for forming a surface glazing of a lightweight material, and more particularly, it can be smoothly processed to a surface by a single molding, so that the design aspect as well as post-processing are not required, thereby improving price competitiveness through cost reduction. The present invention relates to a surface glazing molding method of a lightweight material.

In general, the lightweight material is a material widely used as a packaging material such as automobile parts, electronic parts, heat insulating material and the like.

Such materials are commonly used expanded polypropylene (EPP), expanded polystyrene (EPS), etc., because they meet the required characteristics such as weight reduction, shock absorption, heat insulation, and thermal insulation.

In particular, EPP is an environmentally friendly plastic foam that is flexible, breakable, repeatable, and chemically resistant. As shown in FIG. 1, EPP mainly uses energy absorbers, cushions, and packings in the automotive industry. It is used in various forms, and is also widely used as a packaging material for electronic products in the electronic industry.

Such EPPs are usually manufactured by foam molding, for example, raw material composition → filling of raw materials in mold → steam supply → cooling water supply → product extraction process.

At this time, the forming process is to improve the moisture and shrinkage in the beads (Beads) at a predetermined magnification ratio of 1.5 ~ 2.5Bar and the beads for 6 hours using the filling tank equipment. Is stored in the hopper of the molding machine, and the raw material is rapidly filled in a very short time, such as air pressure 1.0 ~ 1.3Bar, time 3 seconds with the feeder gun, the feeder side of the cavity of the mold as shown in FIG. In this case, it is important to close the mold completely after supplying the raw material with the mold open about 5 mm in order to improve density / weight / dimension / unforming.

In addition, the steam supply is to heat the steam for about 25 seconds in the order of the cavity side heating → core side heating → double-sided heating at a pressure of 1.5 ~ 3.0Bar to fuse the raw material with steam after the raw material supply, the cooling supply is fused It refers to cooling both sides for 70 ~ 75 seconds to cool the product, and it is usually sprayed from the mold back pipe, and has a cooling form sprayed directly through the mold back and the cap in the mold.

In this way, when cooling is complete, taking out of the product to release takes place.

By the way, the conventional lightweight material (EPP) manufactured in this way is mainly used as an internal packaging material that does not focus attention on the appearance, or a lightweight product (material) that does not have to consider the appearance quality because the surface is not smooth and the product quality is poor. There is very limited use.

However, as the utilization of lightweight materials has increased and the demand has increased rapidly, the appearance quality, ie, the visual and tactile design of the product surface, has been required.In order to meet this requirement, additional post processing is required, which causes the disadvantage of losing time and cost. I was.

In addition, the work man-hours are increased, the work efficiency is lowered, and the productivity is also reduced.

The present invention has been created in view of the above-mentioned problems in the prior art, and has been created to solve this problem. It enables the surface glazing at one time during molding, thereby improving the appearance quality and obtaining beautiful appearance quality with only a single material without treatment by separate post-processing or combining with other materials, and obtaining excellent commercial property and cost reduction. The main problem is to provide a surface glazing molding method of a lightweight material to ensure price competitiveness.

The present invention provides a means for achieving the above object, the step of filling the space between the upper mold and the lower mold prepared raw material for lightweight material; Supplying steam generated from the steam generator to melt raw materials; Supplying and cooling the coolant generated from the cooler; In the surface glazing molding method of the lightweight material comprising the step of releasing; The upper mold and the lower mold are formed with a plurality of tunnels arranged so that fluid flows along the circumference thereof, and only communicates with the tunnel only in the product inner surface forming portion, which is the outer surface of the upper mold except the product surface forming portion, which is the inner surface of the lower mold. A cap for spraying steam and coolant is installed; Glazing the surface by first supplying the high temperature / high pressure steam supplied from the steam generator to the tunnel on the product surface forming part side; After supplying steam, which is maintained at a lower temperature and pressure than the primary after the first supply to the product surface forming part, the steam is supplied to the product surface forming part and heated together with the product. Fusion to each other; After the heating is completed, the cooling water is supplied through the tunnel, but the product surface forming part is first quenched in a short time to 40 to 60 ° C. within 10 to 15 seconds, and then the both sides are cooled to 50 to 60 seconds. It provides a surface glazing molding method of a lightweight material characterized in that.

At this time, the primary steam is supplied for 35 to 40 seconds while being maintained at 200 ~ 250 ℃, 25 ~ 30 bar; The secondary steam is characterized in that it is maintained at 1.5 ~ 2.5 bar, 100 ~ 150 ℃.

In addition, the tunnel formed in the upper and lower molds is also characterized in that it is configured to alternately use steam and cooling water through one flow path.

In addition, the tunnel formed in the upper and lower molds, the steam flow path and the cooling water flow path is formed separately, it is also characterized in that they are arranged alternately with each other.

In addition, the step of filling the space between the upper mold and the lower mold prepared raw material for lightweight material; Supplying steam generated from the high pressure boiler to melt raw materials; Supplying and cooling the coolant generated from the cooler; In the surface glazing molding method of the lightweight material comprising the step of releasing; The upper and lower molds have a thickness of 1/2 compared to the existing one, and a tunnel is formed in which a plurality of tunnels are formed so that fluid flows along the circumference thereof, and the product is an outer surface of the upper mold except for a product surface forming part, which is an inner surface of the lower mold. Only the inner surface forming portion is provided with a cap for injecting steam and cooling water in communication with the tunnel; Glazing the surface by first supplying the high pressure steam supplied from the high pressure boiler to the product surface forming part side tunnel; After the first supply, steam maintained at a lower temperature and pressure than the first supply is heated to the product surface forming part and then supplied to the product inner surface forming part and heated. Fused to each other; After the heating is completed, the cooling water is supplied through the tunnel, but the product surface forming part is first quenched in a short time to 40 to 60 ° C. within 10 to 15 seconds, and then the both sides are cooled to 50 to 60 seconds. It provides a surface glazing molding method of a lightweight material characterized in that.

At this time, when using the high pressure boiler, the primary steam is supplied for 35 to 40 seconds while being maintained at 180 ~ 200 ℃, 8 ~ 9 bar; The secondary steam is characterized in that it is maintained at 1.5 ~ 2.5 bar, 100 ~ 150 ℃.

In addition, the upper and lower molds are also characterized in that the molten resin has a smooth flowability during surface glazing by waiting in the range of 15 to 20 seconds before cooling starts.

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According to the present invention, the surface glazing of the lightweight material (EPP) can secure a visual and tactilely beautiful appearance even with a single material, and thus the use range is expanded, and the surface glazing is possible in one molding, thus man-hour, time, The unit price can be lowered, the weight can be further promoted due to weight reduction, and a lightweight material having sufficient stiffness and insulation / insulation function can be obtained.

1 is an exemplary sample photograph of a lightweight material made according to the prior art.
Figure 2 is an exemplary view showing a molding example of a lightweight material according to the prior art.
3 and 4 are exemplary sample photographs of a mold for producing the surface glazed lightweight material according to the present invention.
5 and 6 are exemplary sample photographs of the surface glazed lightweight material produced by the samples of FIGS. 3 and 4.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figures 3 and 4, the lightweight material according to the present invention is completed by the surface glazing (Glazing) molding method.
At this time, Figure 3 is a kind of lower mold, Figure 4 is a kind of upper mold upside down.

The surface glazing method according to the present invention is a mold having a structure capable of switching heating and cooling in a short time so that the EPP can be cooled in a short time in a state in which the EPP is melt-fused by a high temperature heated unlike the conventional water-cooling and direct cooling method. Is done using

At this time, the main feature of the present invention is to heat using a high temperature steam of 200 ~ 220 ℃ generated by the steam generator and then to quench in a short time through the cooling water circulating the mold at the time of the surface glazing is a separate post-processing or Or to produce a lightweight product of excellent appearance quality having a smooth surface with a surface glazed with a single material without attaching other materials that can enhance the appearance quality.

As an example, Figures 5 and 6 is a lightweight demonstration product surface glazed with only a single material according to the present invention.

3 to 6 show an example in which a mold is manufactured in an arbitrary shape for the convenience of description, and the surface is glazed in one molding despite being a single material through the method according to the present invention using the mold. It is shown only, the shape and shape can be variously modified depending on the use of the light weight material.

According to one embodiment, to complete the present invention it is necessary to have a specific mold structure.

However, the mold structure may be only a slight deformation of a conventional existing EPP material mold, but the present invention can be achieved through its fine and accurate control.

To this end, the mold is made of a conventional lightweight material, such as aluminum used in EPP molding, it is preferable to use an aluminum block form for enhanced durability and uniform heat transfer.

At this time, the product surface forming portion 100 to be glazed as the inner surface of the lower mold shown in Figure 3, and the product surface forming portion 200 that glazing is not applied as the outer surface of the upper mold shown in FIG. Must be designed differently.
Here, the material is filled in the space between them in a state where the lower mold and the upper mold are engaged, and the material is molded and commercialized (refer to the products illustrated in FIGS. 5 and 6 as an example). The surface is formed by the inner surface of the lower mold, and the inner mold of the product, that is, the inner surface is formed by the outer surface of the upper mold, so that the product surface forming portion and the product inner surface forming portion for easy understanding.

In addition, the upper and lower molds are formed with a tunnel 110 for supplying high temperature / high pressure steam, but the tunnel 110 is formed of a long flow path so as to surround the mold as a whole, and the product surface forming part 100 has a cap. 220 is not installed, but has a structure in which the cap 220 is installed only on the inner surface forming unit 200 side.

In this case, the cap 220 is a structure for directly supplying steam and cooling water, and communicates with the tunnel 110.

In addition, in the upper and lower molds of the present invention, a well-known steam generator (not shown) for generating high temperature / high pressure steam is used, and a quenchable cooler is also used.

Here, the steam generator and the cooler may be installed and controlled in one facility, but each may be separately installed and configured to selectively supply steam or coolant as needed by sharing the tunnel 110 and switching valves. It may be.

In addition, the tunnel 110 is configured to form a single line (including straight lines and curves) very tightly along the upper and lower molds, and may use steam and cooling water in parallel through one tunnel. The steam flow path and the cooling water flow path may be provided in a form that is configured to be alternately arranged alternately with each other.

In this case, the steam generator may be capable of producing steam of about 200 to 250 ° C. by vaporizing water for 35 to 40 seconds at a pressure of about 25 to 30 bar, and the cooler to be 200 within 10 to 15 seconds. The ability to drop the mold temperature, which was maintained at ˜250 ° C., to 40 to 60 ° C. is required, which is a very important condition for surface glazing in the present invention.

The lightweight molding glazing method according to the present invention using such a facility is as follows.

First, the prepared raw material (EPP) is filled in the space between the upper and lower molds.

At this time, the raw material filling is preferably rapidly filled for 3 to 5 seconds at a pressure of about 1 to 2 bar, and the cracking is kept open for about 15 to 20 mm, and when the raw material supply is completed, the cracking is zeroed to complete the mold. More preferably closed.

Subsequently, steam maintained at 200 to 250 ° C. and 25 to 30 bar supplied from the steam generator is first supplied to the tunnel 110 of the product surface forming unit 100 for 35 to 40 seconds to glare the surface.

Here, the time that the steam is supplied may vary depending on the size, shape, and use of the product, the standard time can be tabulated after the product-specific test, it can be referred to when forming.

When the surface is glazed in this way, after the general steam (1.5 ~ 2.5 bar, 100 ~ 150 ℃) by supplying the secondary to the product surface forming unit 100 and heated to supply to the product inner surface forming unit 200 and then heated, By heating in the form of heating on both sides, the material is fused inside.

As such, the reason why the high temperature / high pressure steam is first supplied to the product surface forming part 100 in a short time is to achieve crystallization by the molten powder on the surface in a very short time, and to cause internal melting in that state to cool it. The product surface forming unit 100 is to maintain a smooth surface while being solidified in a crystalline state.

Thereafter, when the heating is completed, the cooling water is supplied through the tunnel 110, but the product surface forming unit 100 is rapidly cooled to 40 to 60 ° C within 10 to 15 seconds in a short time, and then the second to 50 to Allow both to cool down to 60 seconds.

That is, the time required for the overall cooling is within the range of 60 to 75 seconds, but only the product surface forming unit 100 can achieve surface glazing by intensive cooling in a short time.

At this time, the steam / cooling is preferably circulated through the inlet (inlet) / outlet (outlet) connected to the tunnel 110, the cooling of the upper and lower molds can be made by direct injection method as conventional.

In this way, when cooling is completed, a molded article as shown in Figs. 5 and 6 can be made by taking out the product.

Here, the high temperature / high pressure heating and cooling is illustrated by using only steam and cooling water using water, but the present invention is not limited thereto, and an equivalent heat medium oil may be used, in which case, instead of the steam heater or the cooler, High temperature / high pressure heat medium oil heater and cooler may be used, and the remaining molding process may be performed in the same manner.

Alternatively, the thickness of the upper and lower molds may be reduced to about 1/2 compared to the existing ones, and a reinforcing bar may be further configured around the tunnel 110 to prevent crack breakage, and then molded using a high pressure boiler.

In this case, the steam generated by the boiler can be used while maintaining a pressure of 8 to 9 bar and 180 to 200 ° C. through a high pressure boiler, and the forming method is as described above. By reducing the thickness, the same effect as described above can be obtained by using the difference in thermal conductivity.

Here, about 15 to 20 seconds of waiting time is required for the upper and lower molds and the product surface glazing heated for the surface glazing.

This is to smooth the flow of the molten resin during surface glazing so that the surface is homogeneous, and the opposite side may be molded during this waiting time.

As such, the molding method according to the present invention is capable of sufficiently surface glazing with only a single material, thereby making it possible to make various lightweight materials and products having a high-quality appearance at low cost.

100: surface forming unit 110: tunnel
200: product inner forming portion 220: cap

Claims (8)

Filling the space between the upper mold and the lower mold with the prepared lightweight material; Supplying steam generated from the steam generator to melt raw materials; Supplying and cooling the coolant generated from the cooler; In the surface glazing molding method of the lightweight material comprising the step of releasing;
The upper mold and the lower mold are formed with a plurality of tunnels arranged so that fluid flows along the circumference thereof, and only communicates with the tunnel only in the product inner surface forming portion, which is the outer surface of the upper mold except the product surface forming portion, which is the inner surface of the lower mold. A cap for spraying steam and coolant is installed;
Glazing the surface by first supplying the high temperature / high pressure steam supplied from the steam generator to the tunnel on the product surface forming part side;
After supplying steam, which is maintained at a lower temperature and pressure than the primary after the first supply to the product surface forming part, the steam is supplied to the product surface forming part and heated together with the product. Fusion to each other;
After the heating is completed, the cooling water is supplied through the tunnel, but the product surface forming part is first quenched in a short time to 40 to 60 ° C. within 10 to 15 seconds, and then the both sides are cooled to 50 to 60 seconds. Surface glazing molding method of the lightweight material characterized in that. The method according to claim 1;
The primary steam is supplied for 35 to 40 seconds while being maintained at 200 ~ 250 ℃, 25 ~ 30 bar; The secondary steam is 1.5 ~ 2.5 bar, the surface glazing molding method of the lightweight material, characterized in that maintained at 100 ~ 150 ℃. The method according to claim 1;
The tunnel formed in the upper and lower molds is a surface glazing molding method of the lightweight material, characterized in that configured to be used in parallel to alternately steam and cooling water through one flow path. The method according to claim 1;
The tunnel formed in the upper and lower molds are formed separately from the steam flow path and the cooling water flow path, the surface glazing molding method of the lightweight material, characterized in that arranged alternately. Filling the space between the upper mold and the lower mold with the prepared lightweight material; Supplying steam generated from the high pressure boiler to melt raw materials; Supplying and cooling the coolant generated from the cooler; In the surface glazing molding method of the lightweight material comprising the step of releasing;
The upper and lower molds have a thickness of 1/2 compared to the existing one, and a tunnel is formed in which a plurality of tunnels are formed so that fluid flows along the circumference thereof, and the product is an outer surface of the upper mold except for a product surface forming part, which is an inner surface of the lower mold. Only the inner surface forming portion is provided with a cap for injecting steam and cooling water in communication with the tunnel;
Glazing the surface by first supplying the high pressure steam supplied from the high pressure boiler to the product surface forming part side tunnel;
After the first supply, steam maintained at a lower temperature and pressure than the first supply is heated to the product surface forming part and then supplied to the product inner surface forming part and heated. Fused to each other;
After the heating is completed, the cooling water is supplied through the tunnel, but the product surface forming part is first quenched in a short time to 40 to 60 ° C. within 10 to 15 seconds, and then the both sides are cooled to 50 to 60 seconds. Surface glazing molding method of the lightweight material characterized in that. The method of claim 5, further comprising:
The primary steam is supplied for 35 to 40 seconds while maintaining at 180 ~ 200 ℃, 8 ~ 9 bar; The secondary steam is 1.5 ~ 2.5 bar, the surface glazing molding method of the lightweight material, characterized in that maintained at 100 ~ 150 ℃. The method according to any one of claims 1 to 6;
The surface glazing molding method of the lightweight material, characterized in that the molten resin has a smooth flow during the surface glazing by waiting in the range of 15 ~ 20 seconds until the cooling start after the upper, lower mold heating. delete

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