WO2016031531A1 - Low-temperature heating powder slush molding machine and powder slush molding method - Google Patents

Abstract

Provided are a low-temperature heating powder slush molding machine and a powder slush molding method which are able to stably manufacture a sheet-shaped object with a predetermined thickness from a molding resin even if the inner surface of a die is heated at low temperature. A low-temperature heating powder slush molding machine or the like is provided with: a die heating section for heating a die to a temperature of 220°C or less; a powder slush section for powdering a molding resin for a predetermined time to mold a sheet-shaped object with a predetermined thickness; a post heat treatment section for performing post heat treatment on the sheet-shaped object formed in the die; a die cooling section for cooling the die to a temperature of 60°C or less; and a die machining section for removing the cooled sheet-shaped object from the die, and is characterized in that hot air with a temperature of 200°C or less is blown onto the back surface of the molded sheet-shaped objet in the post heat treatment section.

Description

Low temperature heating type powder slush molding machine and powder slush molding method

The present invention relates to a low-temperature heating type powder slush molding machine and a powder slush molding method, and in particular, heats a molding resin at a low temperature to reduce a thermal fatigue of a mold and stably form a sheet material having a uniform thickness. The present invention relates to a low-temperature heating type powder slush molding machine and a powder slush molding method that can be manufactured.

Conventionally, when manufacturing large and complex sheet-like materials such as automobile interior materials, powder (powder resin) using a powder slush molding machine equipped with a powder slush part and a mold cooling part A powder slush molding method for slush molding is widely implemented.
Then, in order to provide a method for producing a different color skin having a clear boundary portion, a paste-like resin is applied as a boundary portion to the mold by using a different resin on both sides of the boundary portion. A method for producing a different color skin characterized by slush molding has been proposed (see, for example, Patent Document 1).

Further, the applicant of the present invention is a powder slush molding machine and a powder slush molding method for molding a two-color molded sheet using a heat-resistant vinyl chloride resin (coating layer) and a normal vinyl chloride resin (slush layer). In addition, a powder slush molding machine or the like that can quickly and stably obtain a two-color molded sheet having excellent durability has already been proposed.
More specifically, the coating layer is applied to a predetermined portion of a mold using a resin coating device, and then, by slush molding a normal vinyl chloride resin on or adjacent to the coating layer. And a powder slush molding machine that can quickly and stably obtain a two-color molded sheet having excellent adhesion between layers made of a plurality of resins and less variation in film thickness, and thus excellent durability (for example, , See Patent Document 2).

Japanese Patent Laid-Open No. 2-130112 WO2010-098198 Publication

However, in the powder slush molding method disclosed in Patent Document 1, a two-color molded sheet-like product could not be obtained with high accuracy and in a short time using a plurality of molding resins.
That is, in the obtained two-color molded sheet material, the boundary between the slush molded products is not clear, and the mold temperature changes greatly with the passage of time. It was difficult to obtain stably.
Moreover, in the obtained two-color molded sheet-like material, since the strength at the boundary between the plurality of slush molded products is low, there is also a problem that the resulting two-color molded sheet easily breaks and lacks durability.

On the other hand, in the case of the powder slush molding machine disclosed in Patent Document 2, the temperature of the heating furnace is heated to 500 ° C. or higher, and the mold temperature (the inner surface temperature of the mold) is rapidly heated to over 250 ° C. On the contrary, there is a problem that it is difficult to stably obtain a sheet having a uniform thickness within a predetermined time at a mold temperature lower than that.
Further, since the mold temperature is as high as over 250 ° C., when the production of the sheet-like material is repeated, a part of the molding resin is seized in the die, so-called gloss phenomenon occurs, and the obtained sheet-like material There is a need to repeat the mold cleaning process for removing the burned molding resin in a short period of time, for example, 40 times or less. It was.
In addition, when removing a sheet-like material, for example, although it is necessary to rapidly cool a mold at 200 ° C. to a temperature of about 60 ° C. or less, even if combined with water cooling or mist cooling, it is considerable. It took a long time to cool the mold, or the temperature of the mold was rapidly lowered, and there was a problem that the metal fatigue of the mold was easily increased.

Therefore, as a result of intensive studies, the inventors of the present invention have determined that the mold temperature (mold inner surface temperature) measured by a non-contact infrared thermometer, a contact thermocouple, or the like is relatively low, for example, 220 ° C. or less. Even when it is, the combination of a predetermined post-heating treatment and a cooling treatment effectively suppresses the occurrence of metal fatigue of the mold and the baking phenomenon of the molded resin, while a sheet-like material having a predetermined thickness is obtained. It was found that it can be obtained stably and economically.
That is, the present invention is a low-temperature heating type powder slush molding that can stably and economically manufacture a sheet-like material having a predetermined thickness in addition to the occurrence of thermal fatigue of the mold and baking phenomenon of the molding resin. It aims to provide a machine and a powder slush molding method.

According to the present invention, a powder slash that molds a sheet-like material having a predetermined thickness by powdering a mold heating section that heats the mold temperature to 220 ° C. or less and a molding resin having a melting point of 160 ° C. or less for a predetermined time. Part, a post-heat treatment part for post-heating the sheet-like material formed on the mold, a mold cooling part for cooling the mold temperature to 60 ° C. or less, and a mold for removing the cooled sheet-like material A low-temperature heating type powder slush molding machine (hereinafter sometimes simply referred to as a powder slush molding machine).
And in a post-heat-treatment part, a hot air of 200 degrees C or less is sprayed on the back surface (surface opposite to the surface which contact | connects a metal mold | die) of the shape | molded sheet-like material, and the post-heat treatment is performed, The powder slush molding machine characterized by the above-mentioned Can be provided to solve the above-mentioned problems.
In other words, by configuring the powder slush molding machine in this way, it is possible to avoid rapid heating and rapid cooling, suppress the occurrence of molding resin baking phenomenon and cracking due to thermal fatigue of the mold, and consequently A sheet-like material having a predetermined thickness can be obtained stably and economically.
In addition, when a post-heat treatment unit is provided, it is likely that a predetermined treatment time is simply added, but conversely, the heating time or cooling time of the mold can be shortened, Since it is naturally air-cooled when the mold is moved, it can be said that, as a whole, at least the manufacturing time (cycle time) of the sheet-like material is not increased.

Further, according to the low-temperature heating type powder slush molding machine of the present invention, when the molding resin having a melting point of 160 ° C. or less is the first resin and the molding resin having the melting point of 180 ° C. or more is the second resin, In the processing portion, it is preferable to provide a resin coating apparatus for applying the second resin to a part of the mold and forming a second resin layer having a thickness of 1 to 200 μm.
By constituting in this way, even a two-color molded sheet can be obtained quickly and stably.
In the case of a two-color molded sheet-like product, there is a problem that a seizure phenomenon (gross phenomenon) easily occurs on the inner surface of the mold, but the powder slush molding machine of the present invention can sufficiently suppress this. .

In addition, according to the low-temperature heating type powder slush molding machine of the present invention, the amount of heat per unit time (10,000 kcal / hr) applied to the post-heating unit is 1 of the amount of heat per unit time applied to the mold heating unit. A value in the range of / 4 to 2/3 is preferable.
By configuring in this way, the energy efficiency of the powder slush molding machine as a whole is increased, and in addition, a sheet having a predetermined thickness and a uniform thickness can be obtained stably and economically.

Further, according to the low-temperature heating type powder slush molding machine of the present invention, the predetermined time of powdering is set to a value within the range of 32 to 40 seconds, and the predetermined thickness of the sheet-like material is 1.1 to 1.4 mm. It is preferable to set the value within the range.
Thus, by controlling the predetermined time of powdering and the predetermined thickness of the sheet-like material, a practical sheet-like material can be obtained more quickly and stably.

In addition, according to the low-temperature heating type powder slush molding machine of the present invention, the post-heating treatment unit is provided above the mold heating unit, and the heat storage of the mold heating unit is introduced, and the surface of the sheet-like material It is preferable to spray hot air of 200 ° C. or lower.
By comprising in this way, since a mold heating part can be used together with a post-heating process part, it can contribute to space-saving as a whole of a powder slush molding machine, and eventually a predetermined sheet-like object, It can be obtained quickly, stably and economically.

Moreover, according to the low-temperature heating type powder slush molding machine of the present invention, the mold includes a mold heating unit, a powder slush unit, a post-heating treatment unit, a mold cooling unit, and a mold processing unit. It is preferable that a transport device that moves between them is provided, and a preheating device for heating at least the outer surface of the mold is provided in a part of the transport device.
By configuring in this way, it is possible to preheat at least the outer surface of the mold (non-formation surface of the sheet-like material) using the transfer time of the mold, so that the inner surface, the outer surface, The entire temperature of the mold can be heated uniformly and in a short time while effectively suppressing the occurrence of metal fatigue and the phenomenon of baking on the inner surface of the molded resin.

In another aspect of the present invention, a mold heating part that heats the mold temperature to 220 ° C. or less and a molding resin having a melting point of 160 ° C. or less are powdered for a predetermined time to obtain a sheet-like material having a predetermined thickness A powder slash part to be molded, a post-heat treatment part for post-heating the sheet-like material formed on the mold, a mold cooling part for cooling the mold temperature to 60 ° C. or less, and a cooled sheet-like substance A powder slush molding method using a low-temperature heating type powder slush molding machine provided with a mold processing part to be removed.
And in a post-heat-treatment part, it is a powder slush shaping | molding method characterized by spraying a hot air of 200 degrees C or less on the back surface of the shape | molded sheet-like material, and performing a post-heating process.
That is, by carrying out the powder slush molding method in this manner, a sheet-like material having a predetermined thickness can be stably obtained while preventing the molding resin baking phenomenon and metal fatigue of the mold.
In addition, by considering the mode of the post-heat treatment in this way, the back surface of the sheet-like material can be flattened in a short time, and even if the molded resin does not melt sufficiently in the powder slush portion, It can be sufficiently supplemented by post-heating treatment from the back side.

In carrying out the low-temperature heating type powder slush molding method of the present invention, the low-temperature heating type powder slush molding machine includes a mold, a mold heating unit, a powder slush unit, a post-heating treatment unit, and a mold cooling. A transfer device that moves between the mold and the mold processing unit. When the transfer device transfers the mold, the transfer device grips a mold that is different from the mold below the transfer device. Thus, it is preferable to carry them simultaneously.
By carrying out in this way, the mold transfer time can be used to preheat the outer surface of the mold, so the temperature difference is reduced and metal fatigue and the baking phenomenon on the inner surface of the molded resin The entire mold can be heated uniformly and in a short time regardless of the inner surface shape of the mold while effectively suppressing the occurrence of the above.

FIG. 1 is a side view for explaining the low temperature heating type powder slush molding machine of the present invention. FIG. 2 is a plan view for explaining the low temperature heating type powder slush molding machine of the present invention. FIGS. 3A to 3B are views for explaining the mold heating unit. FIG. 4 is a diagram provided to explain the relationship between the mold temperature and the number of productions (line A) in which cracks occur in the mold and the number of productions (line B) in which gloss phenomenon occurs in the mold. FIG. 5 is a diagram provided for illustrating the relationship between the mold temperature, the powdering time, the post-heating treatment, and the thickness of the sheet-like material. FIGS. 6 (a) to 6 (b) are a side view and a plan view for explaining a powder slush molding machine having a conveying device equipped with the preheating device of the present invention. 7 (a) to 7 (c) are views used to explain the powder slush molding method of the present invention (part 1). 8 (a) to 8 (c) are views for explaining the powder slush molding method of the present invention (part 2). FIG. 9 is a diagram provided for explaining the post-heating furnace. FIG. 10 is a diagram for explaining a temperature change profile at the time of powder slush molding in accordance with the first embodiment. FIG. 11 is a diagram for explaining a temperature change profile during powder slush molding in accordance with Comparative Example 1.

[First embodiment]
In the first embodiment, as illustrated in FIGS. 1 and 2, a mold heating part (B part) for heating the mold temperature to 220 ° C. or lower and a molding resin having a melting point of 160 ° C. or lower for a predetermined time. Powdering, a powder slash part (A part) for forming a sheet of a predetermined thickness, a post-heat treatment part (B 'part) for post-heating the sheet-like material formed on the mold, Low temperature heating type powder slush molding machine 10 provided with a mold cooling part (C part) for cooling the mold temperature to 60 ° C. or less and a mold processing part (E part) for removing the cooled sheet-like material. It is.
Then, a low-temperature heating type powder slush molding machine 10 is provided, in which a post-heating treatment is performed by blowing hot air of 200 ° C. or less on the back surface of the molded sheet-like material in the post-heating processing section (B ′ section). Thus, the above-described problems can be solved.
1 shows a side view of the low-temperature heating type powder slush molding machine 10, and FIG. 2 shows a plan view of the low-temperature heating type powder slush molding machine 10 as viewed from above.
Hereinafter, the low temperature heating type powder slush molding machine 10 for producing a two-color molded sheet will be described in detail.

1. Mold processing section (1) Basic configuration The mold processing section (E section) is a two-color molded sheet-like shape, although it is a demolding operation to take out the powder-shaped slush molded sheet 94 from the mold 60 and an optional step. When the object 94 is a target, it is a part for performing the coating operation on the mold 60 by the resin coating device 22.
As illustrated in FIGS. 1 and 2, the mold 60 is attached to the frame member 60a to facilitate movement and quick processing, and, for example, two machines are conveyed together with the frame member 60a. By means of a crane as the device 62, a mold processing part (E part), a mold exchanging part (D part), a cooling part (C part), a heating part (B part), a powder slash part (A part), and a post-heating It is comprised so that it can move arbitrarily between parts (B 'part).

Specifically, the mold 60 typically includes a mold processing part (E part), a heating part (B part), a powder slash part (A part), a post-heating part (B 'part), and a cooling part (C part). ) And the mold processing part (E part) in order, a series of predetermined processes are performed, and the two-color molded sheet 94 or the like can be obtained quickly and stably.
In carrying out this series of predetermined processes, a plurality of molds are prepared and performed in parallel, so that the manufacturing cycle time per one of the two-color molded sheet 94 or the like is reduced. Apparently, it can be very short.
As shown in FIGS. 1 and 2, the low-temperature heating type powder slush molding machine 10 is, as shown in FIGS. 1 and 2, from the left side, a mold processing section (E section), a mold exchanging section (D section), and a cooling section (C section). The heating part (B part), the powder slash part (A part), and the post-heating part (B 'part) are arranged in this order, and the post-heating part (B' part) is arranged at the end. .
This is because, in this arrangement order, it can be easily retrofitted to a powder slush molding machine that does not have a post-heating unit (B ′ portion).
Also, with such an arrangement, simultaneous processing of a plurality of molds can be more easily performed, and natural air cooling can be easily performed when the molds are moved.
In addition, if a crack occurs in the cooling part (C part) or a gloss phenomenon occurs in the heating part (B part) with respect to the mold 60, the die replacement part (D This is because it is also easy to replace the mold 60 with a new mold 60.

Therefore, in the example shown in FIG. 1, first, in the die processing part (E part) as the final point, after the cooled two-color molded sheet-like material is demolded, then at the start point (P1) It specifically shows that a coating operation for producing a two-color molded sheet is performed.
On the other hand, as shown in FIG. 2, when the two-color molded sheet is removed from the mold in the mold processing section (E section), the resin coating device 22 is connected to the mold processing section (E Part) to the side part (P2), a predetermined work space is formed.
In other words, the die processing section (E section) is configured such that the molded two-color molded sheet 94 can be demolded and the coating operation by the resin coating apparatus 22 can be performed mutually.

Next, the mold 60 is transferred from the mold processing section (E section) to the mold heating section (B section) by the transfer device 62, and the hot air of the heating furnace until the mold temperature reaches, for example, 210 ° C. After being heat-treated for 2 minutes using the circulation, it is moved to the powder slash part (A part).
In order to set the mold temperature to about 210 ° C., the temperature of the mold heating section (part B), that is, the temperature of the heating furnace is a value within the range of 380 to 450 ° C. The temperature is preferably adjusted to about 430 ° C.
Next, in the powder slush part (A part), powdering of the molding resin for a predetermined time, that is, powder slush molding is performed.

Next, the transfer device 62 is moved again from the powder slash part (A part) to the post-heating part (B 'part) in a suspended state.
Then, the process which sprays a hot air below 200 degreeC with respect to the inner surface of the formed two-color molding sheet-like material, and planarizes the surface is performed.
More specifically, when the hot air temperature becomes excessively low, the thickness of the two-color molded sheet may vary, or the thickness may become a predetermined value or less.
Accordingly, it is more preferable to blow hot air at 165 to 195 ° C., and further preferably hot air at 170 to 190 ° C. is applied to the inner surface of the formed two-color molded sheet.
The time for blowing hot air at 200 ° C. or less in the post-heating section (B ′ section) is preferably a value in the range of 8 to 30 seconds, and a value in the range of 10 to 25 seconds. More preferred.

Next, the mold 60 is again transferred to the cooling part (C part) by the conveying device 62 while being suspended, and is lowered to a predetermined temperature by the first air, the mist / shower, and the second air. Until the mold temperature reaches about 50 ° C. in three stages of air cooling / water cooling / air cooling.
Finally, the mold 60 is transferred again to the mold processing section (E section) shown in FIG. 1 in a suspended state by the conveying device 62, and the obtained two-color molded sheet 94 is transferred there. The mold is removed from the mold 60, and the series of operations is completed.

(2) Resin Application Device The form of the resin application device 22 provided in the die processing part (E part) is not particularly limited as long as it can form an application layer having a predetermined thickness. As shown in FIG. 4, a nozzle portion (sometimes referred to as a spray nozzle) 22a for discharging the second resin, a driving device 24 for determining the position and rotation direction of the nozzle portion 22a, and the second resin It preferably includes a paint reservoir (not shown) for storage.
That is, the second resin stored in the paint storage unit can be uniformly and rapidly applied to a predetermined portion of the mold 60 by the nozzle portion 22a of the resin coating device 22 and the driving device 24 thereof. .

(3) Coating layer The second resin constituting the coating layer includes epoxy resin, phenol resin, silicone resin, polyacrylic resin, polyester resin, polyimide resin, polyolefin resin, polyurethane resin, polyvinyl chloride resin, fluorine. One kind alone or a combination of two or more kinds of resins and the like can be mentioned.
The heat-resistant plastic is more preferably a heat-resistant vinyl chloride sol composed of a vinyl chloride resin, a curing agent and a plasticizer, or a heat-resistant acrylic sol composed of an acrylic resin, a curing agent and a plasticizer. .
Furthermore, in order to improve the heat resistance of a vinyl chloride resin or the like, a vinyl chloride resin obtained by graft copolymerization with an N-substituted maleimide is more preferable.
That is, with such a heat-resistant plastic sol, good coating properties as a paint can be obtained, and there is no problem of thermal decomposition under a predetermined temperature condition (for example, 300 to 500 ° C. for 1 to 30 minutes). At the same time, it can be firmly fixed to the resin for powder slush molding.

In order to improve the heat resistance of the second resin, it is preferable to add a predetermined amount of a crosslinking agent, a crosslinking accelerator, an inorganic oxide, or a heat stabilizer.
For example, if it is an epoxy resin, a crosslinking agent such as an amine compound, if it is a phenol resin, it accelerates a crosslinking agent such as an acid compound or an alkali compound, if it is a silicone resin, a crosslinking agent accelerator such as an acid compound, If it is a polyacrylic resin, it is a crosslinking agent such as a radical generator or an isocyanate compound; if it is a polyester resin, it is a crosslinking agent such as an isocyanate compound; if it is a polyimide resin, it accelerates a crosslinking agent such as an acid compound; If it is a vinyl resin, crosslinking agents, such as a phenol resin, are mentioned.
Such a crosslinking agent or crosslinking accelerator is usually preferably added in the range of 0.1 to 10 parts by weight, preferably in the range of 0.5 to 5 parts by weight, with respect to 100 parts by weight of the vinyl chloride resin or the like. It is more preferable to add.

Further, as the inorganic oxide, it is preferable to add titanium oxide, alumina oxide, zirconium oxide, silica, calcium carbonate, talc, zeolite, hydrotalcite and the like.
Such an inorganic oxide is usually added preferably in the range of 0.1 to 30 parts by weight and more preferably in the range of 1 to 20 parts by weight with respect to 100 parts by weight of the vinyl chloride resin or the like.
Furthermore, examples of the heat stabilizer include a lead salt stabilizer, a liquid stabilizer, an organic tin stabilizer, an epoxy stabilizer, an organic phosphorous acid compound, a polyhydric alcohol, and an amine compound.
Such a heat stabilizer is usually preferably added in the range of 0.1 to 20 parts by weight and more preferably in the range of 1 to 10 parts by weight with respect to 100 parts by weight of the vinyl chloride resin or the like.

Further, the thickness of the coating layer made of the second resin is preferably set to a value in the range of 1 to 200 μm.
The reason for this is that when the thickness of the coating layer is less than 1 μm, the mechanical strength of the coating layer may be reduced or the color developability may be poor.
On the other hand, when the thickness of the coating layer exceeds 200 μm, the temperature difference (thermal conductivity difference) from the non-heated part in the mold increases, and the interlayer has a uniform thickness and is made of a plurality of resins. This is because it may be difficult to obtain a two-color molded sheet having excellent adhesion.
Therefore, the thickness of the coating layer made of the second resin is more preferably set to a value in the range of 5 to 100 μm, further preferably set to a value in the range of 10 to 50 μm, and in the range of 15 to 30 μm. Most preferably, the value is within the range.

2. Mold heating part (1) Hot air generator The structure of the hot air generator 40 for directly heating the mold 60 in the mold heating part (B part) is not particularly limited. 3 (a) to 3 (b), hot air obtained by a propane gas-derived flame device or the like is passed through a main pipe 43 by an air supply fan 46 provided below or below the hot air outlet 16. It is preferable that it is the structure supplied from the hot air blower outlet 16. FIG.
That is, after the hot air obtained by the hot air generator 40 and the hot air recovered from the furnace through the energy recovery unit 54 described later and sent to the mixing chamber 44 by the air circulation fan 42 are appropriately mixed in the mixing chamber 44. The air supply fan 46 preferably supplies a large amount of hot air having a predetermined wind speed to the hot air outlet 16 through the main pipe 43.
The reason for this is that the hot air 14 circulates in such a manner that the hot air 14 flows along the inner surface of the mold 60 with respect to the heating mode of the mold 60 in the heating furnace 58. This is because heat is efficiently transferred to the mold 60.
That is, since heat is transmitted mainly in the heat transfer mode, the heat supplied to the inside of the heating furnace 58 is less likely to be dissipated out of the heating furnace 58.
Therefore, even if the heating furnace 58 and the hot air outlet 16 are relatively small, the productivity is equal to or higher than that of a conventional large heating furnace. Moreover, by mixing the hot air recovered from the furnace through the energy recovery unit 54 with the hot air supplied from the hot air generator 40 supplied through the hot air outlet 16, the air volume increases, and the inside of the heating furnace 58 and the like. Since the pressure is increased, the heating effect on the mold 60 is increased.
Further, the energy recovery unit 54 is provided around or below the heating furnace 58 and is in a reduced pressure state in comparison with the heating furnace 58 because of the air volume. Can be recovered more effectively.

3 (a) and 3 (b), a hot air storage chamber 39 is provided in the middle of the main pipe 43, and in the hot air storage chamber 39 at the outlet of the main pipe 43. It is preferable to provide a baffle plate 49.
The reason for this is that, by configuring in this way, the hot air sent by the air supply fan 46 can be dispersed by the baffle plate 49, and even when a plurality of hot air outlets 16 are provided, This is because hot air can be blown out uniformly and at high speed from the hot air outlet.
The shape of the opening in the hot air outlet is circular, elliptical, quadrangular (including squares, rectangles, strips, etc.), polygons, so that hot air having a predetermined wind speed can be blown out in a controlled state. It is preferable to have an irregular structure.

(2) Energy Recovery Unit Also, as shown in FIGS. 3A to 3B, hot air (heat energy) having a large amount of energy after heating the mold 60 is high. It is preferable to provide an energy recovery unit 54 for recovery.
That is, it is preferable to dispose the energy recovery unit 54 using the inner bottom surface 19 of the heating furnace 58 or the periphery of the heating furnace 58.
Here, the structure itself of the energy recovery part 54 is not particularly limited. For example, as shown in FIG. 3A, the energy recovery part 54 has an opening leading to the bottom surface 19 in the furnace 58 and generates hot air. It is preferable to have a duct structure provided with a branch pipe 47 connected to the device 40. As described above, it is preferable to dispose the damper 47a in the middle of the branch pipe 47 connected to the energy recovery unit 54.

(3) Heating Furnace The heating furnace 58 in the mold heating part (B part) is arranged above the hot air generator 40 as shown in FIGS. 3 (a) to 3 (b). It is preferably configured as a compact heating device.
Such a configuration not only facilitates the supply of thermal energy to the heating furnace 58, but also facilitates efficient recovery of thermal energy from the heating furnace 58 using the energy recovery unit 54 described above. Can be implemented.
3A is an example of a heating furnace 58 for a mold 60 for forming one two-color molded sheet, and FIG. 3B shows two two-color molded sheets simultaneously. It is an example of the heating furnace 58 for the metal mold | die 60 for shape | molding.

The furnace main body of the heating furnace 58 is formed in a flat rectangular box-like body having an openable and closable opening on the upper surface as shown in FIGS. 3 (a) to 3 (b). After the mold 60 and its frame member 60a are carried into the furnace with the part opened, the opening is closed and hot air 14 is blown by the hot air generator 40 so that the mold 60 is heated. It is configured.
Note that the form of the furnace body included in the heating furnace 58 can be changed as appropriate. For example, it is also preferable that the furnace body has a cylindrical shape, a cubic shape, or an irregular shape corresponding to the shape of the mold.

In addition, the heating furnace 58 is configured to be branched at the outlet portion of the main pipe 43 as shown in FIGS. 3A to 3B, and has a predetermined height. It is preferable to provide a duct structure extending in the vertical direction, that is, the side hot air outlet 50 so that the mold 60 can be heated from the side.
Further, the side hot air outlet 50 is preferably arranged along the inside of the heating furnace 58, and further connected to the branch pipe 41 connected to the hot air generator 40 and the main pipe 43, The air volume is preferably adjusted by the damper 48 or the like.
This is because the mold 60 can be heated not only in the downward direction but also in the horizontal direction by blowing hot air, and the mold 60 can be heated more effectively. Because.
And although it is also preferable to change suitably the shape of the side hot air blower outlet (duct) 50 according to the shape of a metal mold | die, for example, by making it a snorkel type, the side hot air blower outlet 50, the metal mold | die 60, This is a preferable structure because the heating efficiency with respect to the mold 60 can be further increased because the distance can be easily controlled within a certain range, and the hot air blowing direction is constant.

(4) Temperature In the mold heating section (B section), a mold (for example, a coating layer made of the second resin is formed using the heating furnace 58 shown in FIGS. 3 (a) to 3 (b) (for example, (Made of nickel cast alloy with a thickness of 3.5 mm) 60, the inner surface temperature of the mold 60, that is, the mold temperature is set to a value of 220 ° C. or less.
The reason for this is that when the mold temperature exceeds 220 ° C., a gloss phenomenon due to the baking phenomenon of the molding resin frequently occurs, or cracks may occur in the mold during cooling due to metal fatigue of the mold. Because there is.

Here, referring to FIG. 4, the mold temperature (° C.), the number of productions until a crack occurs in the mold (line A), and the number of productions until a gloss phenomenon occurs in the mold (line B). Each relationship will be explained.
That is, the horizontal axis of FIG. 4 indicates the mold temperature (° C.), and the vertical axis indicates the number of times of manufacture (number of times) until a crack occurs in the mold and the manufacture until a gloss phenomenon occurs in the mold. The number of times (number of times) is shown.
Then, it is understood from line A and line B that the number of productions until cracks occur and the number of productions until a gloss phenomenon occurs in the molds are remarkably increased by setting the mold temperature to 220 ° C. or lower.

For example, in terms of the number of productions until cracks occur, the mold temperature (° C) is about 18 times when the mold temperature (° C) is 320 ° C, and the mold temperature (° C) is about 20 times when the mold temperature (° C) is 280 ° C. It is understood that at 250 ° C., about 40 times, when the mold temperature (° C.) is 230 ° C., about 60 times, and when the mold temperature (° C.) is 210 ° C., about 100 times.
Similarly, in terms of the number of production until the gloss phenomenon occurs, the mold temperature (° C.) is about 12 times when the mold temperature (° C.) is 320 ° C., and about 15 times when the mold temperature (° C.) is 280 ° C. ) Is about 28 times at 250 ° C., about 43 times at a mold temperature (° C.) of 230 ° C., and about 120 times at a mold temperature (° C.) of 210 ° C.

Further, with reference to FIG. 5, the relationship between the mold temperature (° C.), the powdering time, the post-heating treatment, and the thickness of the obtained sheet-like material will be described. Line A corresponds to a powdering time of 30 seconds / no post-heating treatment, Line B corresponds to a powdering time of 36 seconds / no post-heating treatment, and Line C corresponds to a powdering time of It corresponds to 36 seconds / after-heating treatment (200 ° C., 15 seconds heating).
And manufacture of a sheet-like object is implemented, and not only the average value (10 places) of the thickness of a sheet-like object but the value of the maximum value and the minimum value is shown similarly.
That is, the horizontal axis of FIG. 5 shows the mold temperature (° C.), and the vertical axis shows the thickness (mm) of the sheet-like material.

From the lines A to C, it is understood that when the mold temperature is 220 ° C. or less, the influence of the powdering time and the post-heating treatment is large in order to obtain a uniform and predetermined thickness.
More specifically, when the mold temperature (° C.) is relatively low, for example, at 210 ° C., as indicated by line A, the powdering time is as short as 30 seconds and there is no post-heating treatment. A sheet-like material having a thickness of 1 mm and a large variation in thickness is obtained.
Further, as indicated by line B, when the powdering time is slightly longer as 36 seconds and there is no post-heating treatment, the sheet has a thickness of about 1.18 mm and a large variation in thickness. A product is obtained.
Further, as shown by line C, when the powdering time is slightly longer as 36 seconds and there is a predetermined post-heating treatment, the sheet has a thickness of about 1.23 mm and a small variation in thickness. A product is obtained.

As is apparent from the above description, it can be said that by setting the mold temperature to a predetermined temperature (220 ° C. or lower), the number of productions until a crack occurs and the number of productions until a gloss phenomenon occurs can be significantly increased.
On the other hand, by setting the mold temperature to a predetermined temperature (220 ° C. or lower), when the powdering time is relatively short (for example, 30 seconds), the resulting sheet-like material is relatively thin. Only by slightly increasing the ring time (for example, 36 seconds), the thickness of the obtained sheet-like material was considerably increased, and the variation tended to decrease.
Furthermore, when the mold temperature is set to 220 ° C. or less, the powdering time is slightly increased (for example, 36 seconds), and the predetermined post-heating treatment (200 ° C. hot air, 15 seconds) is performed. There was a tendency that the thickness of the sheet-like material was considerably increased and the variation was reduced.
Therefore, when the mold temperature is lowered to 220 ° C. or less, by blowing hot air of 200 ° C. or less on the surface of the molded sheet-like material in the post-heat treatment section described later, the molding resin is sufficiently dissolved, It can be understood that it is effective for obtaining uniform and predetermined surface smoothness.
However, if the inner surface temperature of the mold becomes excessively low, it may be difficult to stably form a sheet having a uniform thickness and a predetermined thickness even if a post-heat treatment unit is provided.
Therefore, in order to make the thickness of the sheet-like material a more practical and stable value, it is more preferable to set the mold temperature to a value within the range of 200 to 215 ° C, and within the range of 205 to 210 ° C. More preferably, it is a value.

(5) Heating rate (temperature gradient)
In the mold heating section (B section), the mold heating rate, that is, the temperature gradient during heating is preferably set to a value within the range of 80 to 130 ° C./min.
The reason for this is that when the heating rate of the mold is less than 80 ° C./min, the time for heating the mold to a predetermined temperature, and thus the cycle time becomes excessively long, which is economically disadvantageous. is there.
On the other hand, when the heating rate of the mold exceeds 130 ° C./min, the mold is rapidly heated, and thermal fatigue may be remarkably increased.
Therefore, in the mold heating part (part B), the heating rate of the mold is more preferably set to a value within the range of 90 to 120 ° C./min, and a value within the range of 100 to 115 ° C./min. Is more preferable.
In order to obtain the heating rate of the mold, the above-described mold heating unit is preferably configured. Further, the amount of heat supplied per unit time in the heating furnace is a value within the range of 250 to 600,000 kcal / hr. Preferably, the value is within the range of 300 to 550,000 kcal / hr, and more preferably within the range of 3500 to 500,000 kcal / hr.

3. Powder Slash Part (1) Basic Configuration As shown in FIGS. 7A to 7C and FIG. 8A, the powder slash part (A part) includes a mold 60 including a heated frame member 60a, The reservoir tank 88 containing the molded resin 92 in a fluid state as the first resin, with the inner surface 60b of the mold (molding die) 60 facing downward and the opening surface of the reservoir tank 88 facing upward Thus, it is a part for carrying out the step of integrally connecting up and down.
More specifically, FIGS. 7A to 7C and FIG. 8A show a powder slush molding method in the powder slush portion.
That is, as shown in FIG. 7A, the mold 60 having the coating layer (not shown) formed on the inner surface 60b opposite to the outer surface 60c is heated to a predetermined temperature by the hot air 14 in the heating furnace. Heating, in particular, hot air 14 is blown against the inner surface of the mold to heat to a predetermined temperature.
Next, as shown in FIG. 7B, the mold 60 is placed after being positioned above the reservoir tank 88.

Next, as shown in FIG. 7C, the mold 60 is rotated together with the reservoir tank 88.
And when rotating these, in order to improve the dispersibility of the molding resin 92 accommodated in the reservoir tank 88 and form a sheet-like material (resin film) 94 having a uniform thickness, the reservoir tank 88 It is preferable that air is introduced into the stirring chamber 88a provided below to make the powdered molding resin 92 fluid.
That is, it is preferable that the upper part of the stirring chamber 88a is composed of a perforated member (mesh member) and has a structure in which the molded resin 92 is wound up by the introduced air.
Further, when rotating, the vibration member provided on the frame member 60a is attached to the hammer 100 so that the flow state of the molding resin 92 is activated and a uniform film can be formed as shown in FIG. It is preferable to repeatedly strike at the front end portion 108.
Next, as shown in FIG. 8A, the molding resin 92 is allowed to settle for a predetermined time, and the molding resin 92 is allowed to settle at a predetermined location. At that time, it is preferable to depressurize the air so that the molding resin 92 is in a non-flowing state at an early stage.
And finally, as shown in FIG.8 (b), after post-heat-processing in a post-heating furnace, as shown in FIG.8 (c), using the cooling device 55, with the two-color molded sheet-like article 94, The mold 60 is cooled.

(2) Formwork Further, when the mold 60 including the frame member 60a is reversed in the powder slash part (A part), the sheet 94 can be formed only on the desired inner surface 60b of the mold 60. In addition, it is preferable to provide molds 84 a and 84 b having a predetermined thickness (height) between the mold 60 and the reservoir tank 88.
Here, the lower part of the mold 84b is made of, for example, aluminum, and the upper part of one mold 84a is made of a combination of a silicone rubber / fluororesin film, so that the mold 60 and the reservoir tank 88 are It can also serve to fill the gaps between them.

(3) 1st resin Moreover, although it does not restrict | limit especially as molding resin used in a powder slash part (A part), ie, 1st resin, For example, epoxy resin, urethane resin (thermoplastic Urethane resin also included), polyester resin (including thermoplastic polyester resin), acrylic resin, vinyl chloride resin, olefin resin (including thermoplastic olefin resin), silicone resin, etc., alone or in combination of two or more Is mentioned.
In particular, if it is a vinyl chloride resin or a thermoplastic urethane resin, it has a good affinity with the second resin, provides strong adhesiveness, and is excellent in low-temperature brittleness. is there.
When a thermosetting resin is used as the first resin, a semi-cured thermosetting resin powder, that is, thermosetting in a B-stage state, can be cured in a shorter time to form a predetermined film. It is preferable to use a conductive resin powder.
As the first resin used in the powder slash part (A part), when a vinyl chloride resin is used as the second resin used at the beginning of the two-color molding, better adhesion is obtained. More preferably, at least one of an epoxy resin, a urethane resin, an acrylic resin, or a vinyl chloride resin is used.

(4) Powdering time In the powder slush part (A part), the powdering time is preferably set to a value within the range of 32 to 42 seconds.
This is because when the powdering time is less than 32 seconds, the molding resin as the first resin is easily melted by heat and it becomes difficult to form a sheet-like material having a predetermined thickness. Because there is.
On the other hand, when the powdering time exceeds 42 seconds, the time for heating the mold to a predetermined temperature, and thus the cycle time, becomes excessively long, which may be economically disadvantageous.
Therefore, in the powder slash part (part A), the powdering time is more preferably set to a value within the range of 33 to 40 seconds, and further preferably set to a value within the range of 34 to 38 seconds.

4). Post-heat treatment part (1) configuration The post-heat treatment part (B 'part) sufficiently blows out the molding resin by blowing hot air of 200 ° C or lower onto the back surface of the sheet-like material molded in the powder slush part (A part). It is a part for obtaining uniform surface smoothness by dissolving it in the solution.
Accordingly, as shown in FIG. 9, the heating device in the post-heating processing section (B ′ section) is similar to the mold heating section (B section), the hot air generator 40, the energy recovery section 54, and the post-heating. Although it is basically composed of the furnace 58 ', it differs from that in the mold heating section (B section) in that a side hot air outlet is not provided.

Further, as shown in FIG. 9, the furnace main body of the post-heating furnace 58 ′ is formed in a flat rectangular box-like body having an openable / closable opening on the upper surface, and the upper opening is opened. After the mold 60 and its frame member 60a are carried into the furnace, the opening is closed and the hot air 14 is blown by the hot air generator 40 so that the mold 60 is heated.
The form of the furnace main body included in the post-heating furnace 58 ′ can be changed as appropriate. For example, it is also preferable that the furnace body has a cylindrical shape, a cubic shape, or an irregular shape corresponding to the shape of the mold.

(2) Heating temperature / amount of heat Further, the amount of heat per unit time applied to the mold heating unit (part B) with the amount of heat per unit time (10,000 kcal / hr) applied to the post-heating unit (B ′ part). It is preferable to set the value within a range of 1/4 to 2/3 of the above.
This is because the energy efficiency is increased and the sheet-like material can be obtained quickly and stably and economically by such a configuration.
Therefore, in order to obtain the heating rate of the mold in the post-heat treatment section (B ′ section), the above-described mold heating section is preferably configured, and further, the amount of heat supplied per unit time in the heating furnace is 1 The value is preferably in the range of ˜200,000 kcal / hr, more preferably in the range of 50,000 to 150,000 kcal / hr, and the value in the range of 80 to 120,000 kcal / hr. More preferably.

And, in the post-heat treatment part (B ′ part), when heating the back surface (the surface opposite to the surface in contact with the mold) of the sheet-like material formed in the powder slash part (A part), hot air of 200 ° C. or less It is characterized by spraying.
This is because if the hot air temperature exceeds 200 ° C., cracks may occur in the mold due to metal fatigue of the mold during cooling.
However, if the spraying temperature of the hot air is set too low, the molding resin may not be sufficiently melted, or the surface unevenness may be increased conversely.
Accordingly, it is more preferable to blow hot air having a temperature of 150 to 190 ° C. on the back surface of the formed sheet-like material in the post-heating treatment section, and it is more preferable to blow hot air having a temperature of 160 to 180 ° C.

5. Mold Cooling Unit (1) Configuration As shown in FIG. 8C, the mold cooling unit (C part) cools the mold 60 including the frame member 60a by a cooling device 55 such as water cooling or air cooling. This is a part for solidifying the coating layer and the sheet-like material 94 to a predetermined degree.
More specifically, mold cooling by at least three-stage steps by a combination of a first air blow, a mist / shower, and a second air blow is preferred.
That is, first, air is blown as the first air on the inside and outside of the mold of about 150 ° C. on which the sheet-like material 94 is formed, which is subjected to post-heating treatment, and the mold temperature is set to about 100. It is preferable that the temperature is lowered to about ° C.
Next, it is preferable to spray the water mist and water shower from the mist nozzle and / or the shower nozzle from either one of the nozzles 98 from the outside of the mold to lower the mold temperature to about 50 ° C.
Finally, air is blown as the second air to the outside and inside of the mold that has been formed and cooled to about 50 ° C., and heat is stored at the mold temperature. It is preferable to blow off remaining water droplets and the like to effectively prevent the occurrence of rust in the mold.
Therefore, it is preferable that the mold cooling section (C section) is provided with a shower nozzle / mist nozzle 98 and an air nozzle (not shown) as the cooling device 55 in combination.
The shower device / mist device is preferably connected to one water supply tank, and the spray amount and the shower amount are preferably determined by a switching device such as a control valve provided at the outlet.

(2) Temperature In the mold cooling section (C section), it is preferable that the mold including the sheet-like material is cooled in at least three steps to set the mold temperature to a value of 60 ° C. or lower.
The reason for this is that when the mold temperature exceeds 60 ° C., it may be difficult to remove the mold in the next step or apply the second resin in the next cycle.
However, if the mold temperature is excessively lowered, the cooling time may be excessively long. Therefore, the mold temperature after cooling is preferably set to a value of 30 ° C. or higher.
Accordingly, in the mold cooling section, the mold temperature including the sheet-like material is more preferably set to a value within the range of 30 to 50 ° C., and further preferably set to a value within the range of 40 to 45 ° C.

(3) Cooling rate (temperature gradient)
In the mold cooling section (C section), the mold cooling rate, that is, the temperature gradient during cooling is preferably set to a value within the range of 100 to 220 ° C./min.
The reason for this is that when the mold cooling rate is less than 100 ° C./min, the time for cooling the mold to a predetermined temperature, and thus the cycle time for obtaining one sheet-like product is excessively long. This is because it may be economically disadvantageous.
On the other hand, when the cooling rate of the mold exceeds 220 ° C./min, the mold is rapidly cooled, and thermal fatigue is remarkably increased and cracks are likely to occur.
Therefore, in the mold cooling section (C section), the mold cooling rate is more preferably set to a value within a range of 120 to 210 ° C./min, and a value within a range of 140 to 200 ° C./min. Is more preferable.

6). Mold exchange part Moreover, it is preferable that the powder slush molding machine of this invention is further equipped with a metal mold | die exchange part (D part).
That is, by using such a mold exchanging part (D part), in the middle of powder slush molding, it is changed to a mold for molding two-color molded sheet-like material, or during powder slush molding In some cases, the mold may be damaged. Even in such a case, the mold can be replaced while the powder slush molding machine is operated.
Therefore, as shown in FIGS. 1 and 2, it is preferable that a support base 66 for placing the mold 60 is provided, and the support base 66 is movable by external control.
In the example of the mold exchanging section (D section) shown in FIG. 2, the exchanging mold 60 ′ and the exchanging mold frame member 60 a ′ are just waiting on the support base 66. In addition, another replacement mold 60 ″ and a frame member 60a ″ are in a standby state on the support base 66 extending upward.

7). Preheating unit In the case of the powder slush molding machine 10a shown in FIGS. 6 (a) to 6 (b), it is assumed that at least three molds 60 (60A, 60B, 60C) are used. In addition, a die processing part (E part), a preheating part (A 'part), a die heating part (A part), an integrated part including a powder slash part / cooling part (B part / C part), and a mold exchange It is preferable that each part is moved along arrows A to G by the conveying device 62 provided with the preheating device 62a in the order of the part (D part) and the mold processing part (E part) again. .
And in this powder slush molding machine 10a, by providing the preheating part (A 'part), the process for completing a series of powder slush molding is performed in parallel, and finally the resin molded product The sheet-like material 94 can be obtained quickly and stably.
More specifically, a plurality of molds and at least three molds (mold A, mold B, mold C) are used at the same time, and a predetermined process is performed in parallel on each of the sheets, thereby providing a sheet. The takt time per one piece 94 can be made extremely short compared with the takt time (for example, 240 seconds) in the case of a conventional apparatus, 150 seconds or less, more preferably 120 seconds or less.
In this regard, while referring to the powder slush molding machine 10a shown in FIGS. 6 (a) to 6 (b), tact time can be obtained by simultaneously using three molds (mold A, mold B, and mold C). An example of an operation that shortens will be described.

First, the conveying device 62 provided with the preheating device 62a clamps the mold A, moves up to a predetermined location, and starts preheating the mold A over a predetermined time by the preheating device 62a.
Next, while the mold A is pre-heated, the transfer device 62 moves down and moves from the mold processing section (E section) to the powder slash section (B section).
Next, the conveying device 62 conveys the mold B for which the powder slush molding / cooling process has been completed from the powder slush / cooling part (B / C part) to the mold processing part (E part), and performs the demolding process. Do.
During this demolding process, the transport device 62 transports the mold A from the mold processing section (E section) to the mold heating section (A section), and performs the heat treatment for a predetermined time.
Further, during the heat treatment for the mold A, the transfer device 62 clamps the mold C and starts preheating.

Next, after the transfer device 62 takes out the mold A from the mold heating part (A part) and transports it to the integrated part (B / C part) of the powder slush / cooling part, the powder slush molding / cooling process is sequentially performed. Done.
At that time, when the mold is cooled, the powder box after completion of the powder slash is moved from the powder slash part to the box replacement position, and the cooling booth provided in the mold cooling part is attached to the powder slash part. Move directly under the rotating device. Then, in a state where the mold member is engaged with the frame member that holds the mold and the inner surface of the mold is released to the outside, a shower or cooling mist is sprayed on the outer surface of the mold.
Then, during the powder slush molding / cooling process, the conveying device 62 clamps the mold C to perform preheating, moves it to the mold heating section (A section), and starts the heating process.
That is, the transfer device 62 moves from an integrated part (B / C part) including the powder slash part and the cooling part to the mold heating part (A part), transports the mold C, and performs heat treatment for a predetermined time. It is preferable to carry out.

Finally, the conveying device 62 conveys the mold A for which the powder slush molding / cooling processing has been completed from the integrated portion (B / C portion) including the powder slash portion and the cooling portion to the die processing portion (E portion). And demolding.
Therefore, as described above, in the powder slush molding machine 10 shown in FIGS. 6A to 6B, when the mold A, the mold B, and the mold C are used, according to the predetermined operation example, Independent processes, including a preheating process, can be performed in parallel.

Further, as shown in FIG. 6A, with respect to the preheating unit (A ′ portion), a preheating device 62a and a small power source 62b are provided above the conveying device 62, and the die 60 is conveyed. It is preferable that the outer surface of the mold 60 (the non-formation surface of the sheet-like material) is also configured to be adjusted to a predetermined temperature.
Therefore, the temperature difference between the inner surface and the outer surface of the mold 60 is reduced, and the metal fatigue of the mold 60 and the occurrence of seizure phenomenon on the inner surface of the molding resin are effectively suppressed, and the shape of the mold is reduced. Regardless, the entire mold can be heated uniformly and at high speed.
A normal hook 62c is provided below the transfer device 62 provided with the preheating device 62a, and a die (first die) that is preheated using the hook 62c. Different molds (second molds) 60B and 60C, which are different from 60A, can be gripped and simultaneously conveyed.
Therefore, by simultaneously transporting a plurality of molds (first mold and second mold), the waiting time until the predetermined process is performed on the mold is reduced, and one sheet-like product is obtained. The molding time per contact (tact time) can be further shortened.

Here, it is preferable to provide a far-infrared heating type heater as the preheating device 62a.
The reason for this is that by using such a far-infrared heater, the heat rays penetrate from at least an arbitrary location on the outer surface of the mold to the inside of the mold. This is because the entire mold can be heated more uniformly and at high speed.
In addition, such a far infrared heating type heater can achieve a relatively light weight and space saving.
Therefore, even if a far-infrared heating type heater is attached to a part of the transport device, there is an advantage that the transport device can be transported smoothly and at high speed while preliminarily heating the mold.

Further, as shown in FIG. 6A, the preheating device 62a has an opening that opens downward, and includes a covering member 62d that accommodates a mold through the opening. Is preferred.
The reason for this is that by providing a generally treat-shaped covering member that opens downward in this way, the periphery of the mold can be gripped physically and securely from above.
Further, with such a covering member, the heat insulating gripping member exhibits a predetermined heat insulating property and effectively suppresses heat dissipation even if heat is dissipated upward from the preheated mold. Can do.

8). Sheet-like material Regarding the form of the sheet-like material, the constituent material is not particularly limited, and for example, at least one of epoxy resin, vinyl chloride resin, acrylic resin, olefin resin, urethane resin, polycarbonate resin, or polyester resin It is preferable to be comprised from resin.
The reason for this is that a sheet-like material that is highly versatile, inexpensive, and excellent in decorativeness can be used with this configuration.

Further, the thickness of the sheet-like material is preferably set to a value within the range of 1.1 to 1.4 mm.
The reason for this is that when the thickness of the sheet-like material is less than 1.1 mm, the mechanical strength and durability may be significantly reduced, the use is excessively limited, and the practicality is remarkable. This is because it may decrease.
On the other hand, if the thickness of the sheet-like material exceeds 1.4 mm, the mold temperature must be set too high, the powdering time during formation becomes excessively long, This is because the handling of objects may become difficult.
Accordingly, the thickness of the sheet-like material is more preferably set to a value within the range of 1.15 to 1.35 m, and further preferably set to a value within the range of 1.2 to 1.3 mm.

In addition, the form of the sheet-like material, particularly the two-color molded sheet-like material, is preferably a flat film because it is easy to adhere and handle, but since it is more decorative, the surface It is also preferable that an embossing treatment and an opening (including a slit) are provided on the surface.
Furthermore, it is also preferable that predetermined printing or coloring is performed on the surface or inside of the sheet-like material.
In addition, it is preferable that the sheet-like material has an outer shape suitable for automobile interior parts and bumpers.

[Second Embodiment]
As shown in FIGS. 7 (a) to (c) and FIGS. 8 (a) to (c), the second embodiment includes a mold heating unit for heating the mold temperature to 220 ° C. or less, and a melting point of 160. A powder slash part that forms a sheet material having a predetermined thickness by powdering a molding resin at a temperature of ℃ or less for a predetermined time, a post-heat treatment part that post-heats the sheet material formed on the mold, and a mold A powder slush molding method using a low temperature heating type powder slush molding machine provided with a mold cooling section that cools a mold temperature to 60 ° C. or less and a mold processing section that demolds the cooled sheet-like material. .
And in a post-heat-treatment part, it is a powder slush shaping | molding method characterized by spraying a hot air of 200 degrees C or less on the back surface of the shape | molded sheet-like material, and performing a post-heating process.
Hereinafter, the powder slush molding method of the second embodiment will be specifically described with reference to an example of manufacturing a two-color molded sheet.

1. Application Step In the application step, a predetermined second resin is applied to a part of the mold 60 in the mold processing part (E part) to form an application layer having a thickness of 1 to 200 μm (hereinafter referred to as a resin application process). , Sometimes referred to as a painting process).
That is, in the painting process, the mold 60 is disposed at a predetermined location, and the coating device, for example, a spray resin coating device equipped with a spray nozzle having an L-shaped tip is used to place the mold 60 at a predetermined location. On the other hand, it is a step of forming a coating layer having a predetermined thickness.
In that case, it is preferable to attach a masking member in advance to a predetermined location so that the paint does not adhere to a location other than the desired location.
The coating conditions are not particularly limited. For example, in order to form a coating layer having a thickness of 1 to 200 μm, a coating speed of 1 to 60 seconds / m ² is preferable. More preferably, the coating speed is ² sec / m ² .

2. Heating step In the heating step, the mold 60 on which the coating layer is formed in the mold heating part (B part) remains in that state, and a relatively low temperature, that is, a mold temperature of 220 ° C. or lower, This is a heating step (hereinafter sometimes referred to as a heating step).
Therefore, the mold 60 on which the predetermined coating layer is formed is moved from the mold processing section (E section) to the mold heating section (B section) and carried into the heating furnace 58, where the predetermined coating layer is formed. And heating so that the inner surface temperature of the mold 60 is 220 ° C. or lower.
As described above, in the powder slush process, the inner surface temperature of the mold (including the coating layer surface) is 220 ° C. or lower so that a two-color molded sheet having a uniform thickness can be formed. It is preferable to perform convection heating with hot air.

3. Powder slush process The powder slush process is a process of forming a predetermined sheet-like material in the state of the mold 60 in which the coating layer is formed in the powder slash part (A part) (hereinafter referred to as a slush process). There is.)
That is, a coating layer (not shown) is formed, and the heated mold 60 is moved from the mold heating part (B part) to the powder slash part (A part), and as shown in FIG. As described above, the two-color molded sheet 94 made of the first resin molding resin 92 is formed on or adjacent to the coating layer.

Here, in carrying out the slash process, the mold 60 including the frame member 60a and the reservoir tank are rotated in a connected state, and a two-color molded sheet having a predetermined thickness is formed on the inner surface 60b of the mold 60. Preferably, the object 94 is formed.
That is, it is preferable that the mold 60 including the frame member 60a and the reservoir tank 88 are combined and inverted in the vertical direction.
This is because, if implemented in this way, the molding resin (powder) 92 in the reservoir tank 88 falls under its own weight and falls onto the inner surface 60 b of the mold 60, so that the molding resin 92 that contacts the inner surface 60 b of the mold 60 is used. This is because only the molding resin 92 in the vicinity thereof adheres in a molten state due to the heat of the mold 60 and the two-color molded sheet 94 can be formed in a short time.
More specifically, as shown in FIG. 4, when the mold temperature is excessively low, the number of productions in which cracks occur and the number of productions in which gloss phenomenon occurs are remarkably increased, but as shown in FIG. There exists a tendency for the thickness of a sheet-like thing to become thin, or the dispersion | variation in thickness becomes large.
Therefore, the mold temperature is heated to a value of 220 ° C. or lower, the powdering time is adjusted, and hot heat of 200 ° C. or lower is blown against the back surface of the sheet-like material, followed by heat treatment. It is understood that it is effective.

Further, when the mold 60 including the frame member 60a is reversed, the molding resin 92 is not scattered except in a predetermined place, and the two-color molded sheet 94 can be formed only on the desired inner surface 60b of the mold 60. Thus, it is preferable to suck through the stirring chamber 88a to reduce the pressure in the mold 60.
That is, during the powder slush molding by rotating the mold 60, suction is performed to reduce the internal pressure of the mold 60, and before the powder slush molding, the molding resin 92 contained in the reservoir tank 88 is sucked. Is preferably provided with a pressure adjusting device (not shown) for blowing a predetermined amount of air.

4). Post-heat treatment process In the post-heat treatment process, hot air of 200 ° C. or less is blown onto the back surface of the two-color molded sheet-like product formed by powder slush, and the molded resin is not sufficiently melted. In this case, it is a step of flattening it.
In other words, by providing a post-heat treatment step, the temperature can be lowered relatively slowly, and the problems of powder slush molding (insufficient heating) due to low-temperature heating can be solved, and the resin baking phenomenon and metal fatigue of the mold It is possible to stably and economically obtain a two-color molded sheet having a predetermined thickness.
However, if the spraying temperature is excessively low, the molding resin may not be sufficiently melted and the thickness variation may increase.
Accordingly, it is more preferable to blow hot air at 165 to 195 ° C., and further preferably hot air at 170 to 190 ° C. is applied to the inner surface of the formed two-color molded sheet.

And, in performing the post-heat treatment step, the post-heat treatment section is provided above the mold heating section, introducing heat storage of the mold heating section, on the surface of the two-color molded sheet-like product, It is also preferable to blow hot air of 200 ° C. or less.
This reason can contribute to space saving as a whole powder slush molding machine by carrying out in this way, and as a result, a two-color molded sheet can be obtained quickly and stably and economically. Because it can.

5. Mold Cooling Process The mold cooling process is a process of cooling the mold 60 on which the two-color molded sheet 94 is formed in the mold cooling part (C part) (hereinafter sometimes referred to as a mold cooling process). It is.
That is, the mold 60 in a state where the two-color molded sheet 94 is molded is moved from the powder slash part (A part) to the mold cooling part (C part), where there is at least a first air blow, mist / shower. And a step of cooling in a three-step step by a combination of the second air blow.

More specifically, first, air is blown as the first air on the inside and outside of the mold 60 at about 150 ° C. on which the two-color molded sheet 94 is formed, which is subjected to post-heating treatment. Then, the mold temperature is lowered to about 100 ° C. That is, it is preferable to set the cooling rate of the mold during the blowing of the first air to a value within the range of 120 to 160 ° C./min.
Next, water mist and water shower are sprayed from the outside of the mold from the mist nozzle and shower nozzle or any one of the nozzles, and the mold temperature is increased from about 100 ° C. to about 60 ° C. using evaporation enthalpy. Reduce. That is, the mold cooling rate during mist / shower cooling is preferably set to a value in the range of 165 to 190 ° C./min.
Finally, air is blown as second air to the outside and inside of the mold at about 60 ° C. on which the two-color molded sheet is formed, and further, the mold temperature and the internal heat contained in the resin sheet are lowered. At the same time, water droplets remaining on the mold surface are blown off to effectively prevent the rust from being generated in the mold. That is, it is preferable that the cooling rate of the mold during the blowing of the second air is set to a value within the range of 40 to 100 ° C./min.

6). Demolding process The demolding process is a process of demolding the two-color molded sheet-like material from the mold in the mold processing section (hereinafter sometimes referred to as a demolding process).
That is, the two-color molded sheet 94 lowered to about 60 ° C. is removed from the mold 60 by moving from the mold cooling section (C section) to the mold processing section (E section). It is a process to do.
The demolding step can be automatically performed using a robot, or the two-color molded sheet can be demolded as a human work.

7). Others As shown in FIG. 6 (b), as a preheating step, preheating is performed by providing a mold 60 in which a coating layer is formed in a mold processing section (E section) in a part of a transport apparatus (a crane or the like). Using the apparatus, for example, a step of heating the outer surface of the mold 60 (hereinafter sometimes referred to as a preheating step) is provided so that the mold temperature (outer surface temperature) is 100 to 200 ° C. It is preferable.
That is, in the preheating step, the predetermined coating layer is dried while the mold 60 on which the predetermined coating layer is formed is moved from the mold processing section (E section) to the mold heating section (A section). At the same time, it is a step of heating so that the outer surface temperature of the mold 60 becomes a predetermined temperature.

Further, in the preheating step, the preheating device 62a is operated on the gripped outer surface (B surface) of the mold 60 so that the entire or part of the outer surface of the mold 60 is heated to a temperature of 100 to 200 ° C. The temperature is preferably 165 to 195 ° C., more preferably 170 to 190 ° C.
This is because the temperature difference from the inner surface temperature of the mold is reduced in the heating furnace 58 by preheating the outer surface of the mold 60 so as to achieve such a temperature, and a predetermined temperature (for example, 250 This is because high-speed and uniform heating is further facilitated when the main heating is performed so that the temperature becomes ~ 300 ° C.

In the preheating step, it is preferable that the transport device 62 grips the mold 60 and at the same time the preheating device 62a is switched on to preheat the mold 60.
The reason for this is that the mold transfer time can be fully utilized by preheating the mold in synchronism with the gripping operation of the mold.
However, even if it is said that the preheating device is switched on at the same time that the mold is gripped, it does not necessarily have to be 0 seconds later, depending on the conditions of powder slush molding, etc., after 0.1 seconds or 1 second It may be.

In addition, in the preheating process, in order to prevent a temperature drop during the transfer of the mold, a preheating process is performed while another mold is clamped to the transfer device during the heating process for another mold. Is also preferable.
The reason for this is that the sheet-like material can be more quickly and stably formed on the heat-treated mold at the integrated part (B part / C part) including the powder slash part by a predetermined preheating treatment. This is because the forming time (tact time) per sheet can be shortened.

As described above, after the mold 60 is heat-treated using the hot air of the heating furnace 58 until the temperature of the mold 60 reaches a predetermined temperature, the mold 60 is moved to the powder slash part (B part). Will be.
At that time, the temperature of the outer surface of the mold is set to a value within a desired temperature range as the heating for maintaining the temperature by the preheating device until the mold is transferred to the powder slash part (B part). Can be maintained.
That is, the preheating device can heat the outer surface of the mold at a predetermined temperature even at a temperature at which it is maintained (sometimes referred to as maintenance heating, as distinguished from preheating). In the powder slush portion, the sheet-like material can be more stably formed.

[Example 1]
1. Preparation of sheet-like material (1) Mold preparation step In the mold processing section (E section) shown in FIG. 1, a predetermined mold (nickel electromold, thickness 3.5 mm) was prepared.
FIG. 10 shows a temperature change profile related to the entire mold temperature when performing powder slush molding. In FIG. 10, the position indicated by point A is the mold during the mold preparation process. The temperature is indicated and is about 48 ° C.

(2) Coating step Next, in the mold processing section (E section), after mounting a masking member on the mold, a resin coating apparatus is used to apply heat resistant vinyl chloride as a second resin to a predetermined location. Using a resin (100 parts by weight of an N-maleimide graft-polymerized vinyl chloride resin, 10 parts by weight of a curing agent, 5 parts by weight of a plasticizer, 2 parts by weight of tribasic lead sulfate, 2 parts by weight of lead stearate) A coating layer was formed.
In addition, the position shown by A 'point in FIG. 10 was measured with the general thermometer, for example, a non-contact infrared thermometer, a thermography thermometer, or a contact-type thermocouple (hereinafter the same). The inner surface temperature of the mold during the coating process is shown, and was about 48 ° C. as in the mold preparation process.

(3) Heating process Next, using a crane, the mold on which the predetermined coating layer is formed is moved from the mold processing section (E section) shown in FIG. 1 to the mold heating section (B section). After removing the masking member, it is housed in a heating furnace (supplied heat amount per unit time: 400,000 kcal / hr) maintained at a temperature of about 430 ° C. so that the inner surface temperature of the mold becomes 210 ° C. And heated for about 88 seconds.
In FIG. 10, point B indicates the mold temperature at the start of heating, and the mold temperature at the moment when it is put into the heating furnace is about 48 ° C.
Further, in FIG. 10, point C indicates the inner surface temperature of the mold at the end of heating, which is about 210 ° C. Therefore, it can be understood that in the heating step, the mold was efficiently heated so that the inner surface temperature of the mold became a predetermined value at a heating rate of about 110 ° C./min.
The inner surface temperature of the mold as the mold temperature can be directly measured by the above-described non-contact infrared thermometer, thermography thermometer, or contact thermocouple, or these non-contact infrared thermometers The outer surface temperature of the mold can be measured by a thermometer or the like, and then the inner surface temperature can be estimated in consideration of the material and thickness of the mold, that is, indirectly measured.

(4) Powder Slash Step Next, as shown in FIG. 1, the mold is moved from the mold heating part (B part) to the powder slash part (A part) using a crane, and the powder slush molding machine is used. Then, a molding resin (average particle size: 30 μm powder) made of heat-resistant vinyl chloride resin is powder-slush-molded for 36 seconds on a mold on which a predetermined coating layer is formed, and a two-color molding having a thickness of about 1.2 mm A sheet was obtained.
In addition, in FIG. 10, the temperature change from the C point to the D point occurs corresponding to the time when the mold is moved from the mold heating part (B part) to the powder slash part (A part), It will be appreciated that the mold temperature has decreased by about 10 ° C. in about 20 seconds.
Next, in FIG. 10, the point D indicates the mold temperature at the start of slush molding, which is about 195 ° C.
In FIG. 10, point E indicates the mold temperature at the end of slush molding, and it is understood that the temperature has dropped to about 160 ° C.

(5) Post Heat Treatment Step Next, as shown in FIG. 1, the mold is moved from the powder slash part (A part) to the post heat treatment part (B ′ part) using a crane, and the post heating furnace (20 200 kcal / hr), hot air at 200 ° C. was blown on the back surface of the two-color molded sheet formed by powder slush for 15 seconds to sufficiently melt the molding resin and flatten it.
In addition, in FIG. 10, the temperature change from E point to E 'point occurs corresponding to the time when the mold was moved from the powder slash part (A part) to the post-heating part (B' part). It is understood that the temperature is lowered by about 10 ° C. in about 10 seconds.
Next, in FIG. 10, the point E ′ indicates the mold temperature at the start of the post-heating treatment, which is about 170 ° C.
In FIG. 10, point F indicates the mold temperature at the end of the post-heating treatment, and after the post-heating for about 15 seconds, the mold temperature is maintained at about 170 ° C., and the heating during the post-heating treatment is performed. The rate was about 0 ° C./min.
This is because the post-heating treatment is performed so that only the back surface of the molded two-color molded sheet is substantially melted and flattened, so that the mold temperature itself was adjusted to be a substantially constant temperature. Is.

(6) Cooling Step Next, as shown in FIG. 1, the mold including the two-color molded sheet-like material is moved from the post-heat treatment section (B ′ section) to the mold cooling section (C section) using a crane. Then, it was confirmed that the surface temperature of the two-color molded sheet was lowered to about 100 ° C. by spraying the first air (dry air) for about 20 seconds against the mold at about 150 ° C. That is, it is understood that the cooling rate during the blowing of the first air was about 150 ° C./min.
Next, mist / shower cooling was performed for about 15 seconds, and it was confirmed that the surface temperature of the two-color molded sheet was lowered from about 100 ° C. to about 55 ° C. That is, it is understood that the cooling rate during the mist / shower cooling was about 180 ° C./min.
Furthermore, the second air (dry air) is blown for about 5 seconds to scatter water droplets adhering to the surface of the two-color molded sheet, and the mold temperature is lowered from about 55 ° C. to about 50 ° C. It was confirmed. That is, it is understood that the cooling rate during the blowing of the second air was about 60 ° C./min.
In FIG. 10, the temperature change from the point F to the point F ′ occurs corresponding to the time for moving the mold from the post-heating processing part (B ′ part) to the mold cooling part (C part). ing.
The point F ′ indicates the mold temperature at the start of cooling, which is about 150 ° C.
The G1 point indicates the mold temperature after the first air blowing and is about 100 ° C. The G2 point indicates the mold temperature after the mist / shower blowing and is about 55 ° C. .
Furthermore, point G3 indicates the mold temperature after the second air is blown, and is about 50 ° C.

(7) Demolding Step Next, as shown in FIG. 1, the mold including the two-color molded sheet is moved from the mold cooling section (C section) to the mold processing section (E section) using a crane. The two-color molded sheet that had been cooled to a temperature of about 50 ° C. after the cooling step was removed by human work to obtain the two-color molded sheet of Example 1.
In FIG. 10, the temperature change from the point G3 to the point H occurs corresponding to the time when the die is moved from the die cooling part (C part) to the die processing part (E part). Although it takes about 5 seconds, it is understood that the two-color molded sheet is removed with the mold temperature of about 50 ° C.

2. Evaluation of two-color molded sheet (1) Formability of two-color molded sheet (Evaluation 1)
The thickness of arbitrary 10 places of the obtained two-color molded sheet was measured with a caliper, and the film thickness formability was evaluated from the average thickness according to the following criteria.
A: The average thickness is 1.3 mm or more.
○: The average thickness is 1.2 mm or more.
Δ: Average thickness is 1.0 mm or more.
X: Average thickness is less than 1.0 mm.

(2) Variation in thickness of two-color molded sheet (Evaluation 2)
Thicknesses at 10 arbitrary positions of the obtained two-color molded sheet were measured with calipers, and evaluated as variations in film thickness according to the following criteria from the difference between the maximum value and the minimum value.
A: The difference between the maximum value and the minimum value is less than 50 μm.
○: The difference between the maximum value and the minimum value is 50 μm to less than 200 μm.
Δ: The difference between the maximum value and the minimum value is 200 μm to less than 500 μm.
X: The difference between the maximum value and the minimum value is 500 μm or more.

(3) Gloss resistance (Evaluation 3)
Using the powder slush molding machine shown in Fig. 1, the production of a two-color molded sheet is repeated under the same conditions, and the number of times of production until the gloss phenomenon (baking phenomenon) occurs is measured. The gloss resistance of the mold was evaluated.
(Double-circle): It is 100 times or more.
○: 80 times or more.
(Triangle | delta): It is 50 times or more.
X: Less than 50 times.

(4) Crack resistance (Evaluation 4)
Using the powder slush molding machine shown in FIG. 1, the production of a two-color molded sheet is repeated under the same conditions, the number of times of production until cracks occur in the mold is measured, The mold was evaluated for crack resistance.
(Double-circle): It is 100 times or more.
○: 80 times or more.
(Triangle | delta): It is 50 times or more.
X: Less than 50 times.

[Examples 2 to 3]
In Examples 2 to 3, a two-color molded sheet was prepared and evaluated in the same manner as in Example 1 except that the surface temperature of the mold in the heating process was changed to 220 ° C. and 200 ° C., respectively. .

[Examples 4 to 5]
In Examples 4 to 5, a two-color molded sheet was prepared and evaluated in the same manner as in Example 1 except that the spraying temperature in the post-heating step was changed to 180 ° C. and 190 ° C., respectively.

[Comparative Example 1]
In Comparative Example 1, a two-color molded sheet was prepared in the same manner as in Example 1 except that the surface temperature of the mold in the heating process was changed to 260 ° C. and no post-heating treatment was performed. ,evaluated.
In addition, in FIG. 11, the temperature change profile of the metal mold | die based on the comparative example 1 is shown.
That is, in FIG. 11, the point B indicates the mold temperature at the start of heating, and the mold temperature at the moment when it is put into the heating furnace is about 48 ° C. Furthermore, in FIG. 11, the point C indicates the mold temperature at the end of heating, which is about 260 ° C. Therefore, it is understood that the inner surface temperature of the mold rises at a heating rate of about 110 ° C./min in the heating process of about 2 minutes.
On the other hand, point F in FIG. 11 indicates the mold temperature at the start of cooling, and the temperature is about 205 ° C. Further, in FIG. 11, point G indicates the mold temperature at the end of cooling, which is about 50 ° C. Therefore, it is understood that the mold temperature decreases at a cooling rate of about 260 ° C./min in the cooling process of about 36 seconds.

[Comparative Example 2]
In Comparative Example 2, a two-color molded sheet was prepared in the same manner as in Example 1 except that the surface temperature of the mold in the heating process was changed to 280 ° C. and no post-heating treatment was performed. ,evaluated.
In the mold cooling process, the mold temperature decreased to about 50 ° C. at a cooling rate of about 280 ° C./min, and cracks and the like tended to occur.

[Comparative Example 3]
In Comparative Example 3, a two-color molded sheet was prepared in the same manner as in Example 1 except that the surface temperature of the mold in the heating process was changed to 320 ° C. and no post-heating treatment was performed. ,evaluated.
In the mold cooling process, the mold temperature decreased to about 50 ° C. at a cooling rate of about 320 ° C./min, and cracks and the like tended to occur.

[Comparative Example 4]
In Comparative Example 4, the surface temperature of the mold in the heating step was changed to 200 ° C., and the post-heating treatment was not performed. did.
However, since a two-color molded sheet having a practical thickness and strength could not be obtained, the subsequent evaluation was stopped.

Evaluation 1: Average thickness evaluation 2: Thickness variation evaluation 3: Gloss resistance evaluation 4: Crack resistance

According to the low-temperature heating type powder slush molding machine and the powder slush molding method of the present invention, in the production of a normal one-color molded sheet material or a two-color molded sheet material rich in decoration, etc. A sheet of uniform thickness while preventing the occurrence of mold resin baking (gross generation) and mold metal fatigue (crack generation) by combining low-temperature heating and predetermined post-heating and cooling processes. The product can be obtained stably and economically.

In addition, when a post-heat treatment unit is provided or when the powdering time is lengthened, it is likely that the predetermined treatment time is simply added, but conversely, the heating time and cooling time of the mold are shortened. Furthermore, since it is naturally air-cooled when the mold is moved, it has been found that the manufacturing time (cycle time) of the sheet-like material does not increase at all.

In addition, by having a conveying device equipped with a preheating device as a preheating unit, processing for completing a series of powder slush molding is performed in parallel, and finally, a sheet-shaped resin molded product Things can be obtained quickly and stably.
That is, the outer surface of the mold, which is a non-formed surface, can be adjusted to a predetermined temperature during the transfer of the mold or during other processing times, so that the inner surface shape of the mold (curvature, dent, offset, etc. ), The temperature difference between the inner surface and the outer surface of the mold is reduced, effectively suppressing the metal fatigue of the mold and the occurrence of seizure phenomenon on the inner surface of the molded resin, and the entire mold Can be heated uniformly and at high speed.

Therefore, according to the obtained sheet-like material (two-color molded sheet material, etc.), it is expected to be suitably used as an interior material and a bumper for automobiles, etc. It is expected to be implemented easily and economically.

10: Low temperature heating type powder slush molding machine, 14: Hot air, 16: Hot air outlet, 21, 21 ': First resin, 22: Resin coating device, 22a: Nozzle section, 24: Drive device, 25: Shutter, 40: Hot air generator, 41: Branch pipe, 43: Main pipe, 48: Damper, 49: Baffle plate, 54: Energy recovery unit, 55: Cooling device, 58: Heating furnace, 58 ': Post-heating furnace, 60: 60a, 60 '': exchange mold, 60a ', 60a' ': exchange mold frame member, 62: transport device (crane), 60a: heel frame member, 60b: inner surface, 60', 60 ": exchange mold 64: Powder slush device, 84a, 84b: Formwork, 88: Reservoir tank, 88a: Stirring chamber, 92: Second resin (molded resin), 94: Sheet material (two-color molded sheet material), 100: hammer

Claims (8)

1. A mold heating section for heating the mold temperature to 220 ° C. or lower;
   Powdering a molding resin having a melting point of 160 ° C. or less for a predetermined time to form a sheet-like material having a predetermined thickness;
   A post-heat treatment section for post-heating the sheet-like material formed on the mold; and
   A mold cooling section for cooling the mold temperature to 60 ° C. or less;
   A mold processing section for demolding the cooled sheet-like material;
   A low temperature heating type powder slush molding machine equipped with
   A low-temperature heating type powder slush molding machine, wherein the post-heating treatment unit performs post-heating treatment by blowing hot air of 200 ° C. or less onto the surface of the formed sheet-like material.
2. When the molding resin having a melting point of 160 ° C. or lower is the first resin, and the molding resin having a melting point of 180 ° C. or higher is the second resin,
   The mold processing unit is provided with a resin coating device for applying the second resin to a part of the mold to form a second resin layer having a thickness of 1 to 200 μm. The low-temperature heating type powder slush molding machine according to claim 1.
3. The amount of heat per unit time (10,000 kcal / hr) applied to the post-heating unit is set to a value within a range of ¼ to 2/3 of the amount of heat per unit time applied to the mold heating unit. The low-temperature heating type powder slush molding machine according to claim 1 or 2.
4. The predetermined time of the powdering is set to a value within a range of 32 to 40 seconds, and the predetermined thickness of the sheet-like material is set to a value within a range of 1.1 to 1.4 mm. 4. The low-temperature heating type powder slush molding machine according to any one of 3 above.
5. The post-heat treatment unit is provided above the mold heating unit, introduces heat storage of the mold heating unit, and blows hot air of 200 ° C. or less on the surface of the sheet-like material. The low-temperature heating type powder slush molding machine according to any one of claims 1 to 4.
6. There is provided a transfer device for moving the mold between the mold heating unit, the powder slush unit, the post-heat treatment unit, the mold cooling unit, and the mold processing unit. The low-temperature heating type powder according to any one of claims 1 to 5, wherein a preheating device for heating at least an outer surface of the mold is provided in a part of the conveying device. Slush molding machine.
7. A mold heating section for heating the mold temperature to 220 ° C. or lower;
   Powdering a molding resin having a melting point of 160 ° C. or less for a predetermined time to form a sheet-like material having a predetermined thickness;
   A post-heat treatment section for post-heating the sheet-like material formed on the mold; and
   A mold cooling section for cooling the mold temperature to 60 ° C. or less;
   A mold processing section for demolding the cooled sheet-like material;
   A powder slush molding method using a low temperature heating type powder slush molding machine equipped with
   A powder slush molding method, wherein the post-heat treatment section performs post-heat treatment by blowing hot air of 200 ° C. or less onto the surface of the molded sheet-like material.
8. The low-temperature heating type powder slush molding machine includes the mold, the mold heating unit, the powder slush unit, the post-heating unit, the mold cooling unit, and the mold processing unit. A transfer device that moves between the molds, and when the transfer device transfers the mold, hold the mold different from the mold below the transfer device and simultaneously transfer the mold. The powder slush molding method according to claim 7, wherein the powder slush molding method is used.

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