JP5684582B2 - Manufacturing method of resin foam molded product and resin foam molded product manufacturing equipment - Google Patents

Description

  The present invention relates to a method for manufacturing a resin foam molded article and a manufacturing facility for a resin foam molded article. More specifically, the present invention relates to a method for producing a laminated foam sheet by thermally laminating a resin film on the surface of a belt-shaped resin foam sheet. The present invention relates to a method for producing a resin foam molded product in which a laminated foam sheet is thermoformed by a thermoforming apparatus to produce a resin foam molded product, and a resin foam molded product production facility used in such a production method.

Conventionally, resin foam molded products such as foam trays, which are thermoformed from resin foam sheets (hereinafter also simply referred to as “foam sheets”) made of thermoplastic resin, have been widely used. In order to do this, for example, a continuous production method using a sheet roll called an original fabric roll in which a wide band-like foam sheet having a width of several tens of cm to over 1 m is wound is adopted. Yes.
For example, in a method for manufacturing a foam tray, a foaming sheet is cut with a punching blade die along a contour of the formed product shape and a thermoforming apparatus having a mold for forming the product shape on the foam sheet. The foam sheet is fed out from the raw roll and continuously supplied to a production line equipped with a punching device for taking out the product from the foam sheet, and the foam tray shape is formed in order from the front end side of the foam sheet with the mold. A production method is employed in which the foamed tray formed together with the punched blade die is sequentially punched and taken out from the foamed sheet.

By the way, foamed trays for containing foods and the like are widely used in which resin films are attached to the inner surface, outer surface, or both inner and outer surfaces for the purpose of improving the strength of the container and imparting decorative properties. ing.
When such a container is formed, a method is employed in which a foam sheet on which a resin film is laminated is once produced and the foam sheet on which the resin film is laminated is molded by a thermoforming apparatus. (Hereinafter, the term “foamed sheet” is intended to be used only for those in which a resin film is not laminated unless otherwise specified. The term “foamed sheet” is used.)

In addition, as a method of producing this laminated foam sheet, when extruding a foam sheet with an extruder, a method of co-extruding a resin film from the same die and laminating, or on a foam sheet prepared in advance A method is known in which a molten resin is extruded into a film using a T-die and adhered to a foamed sheet before the resin cools and hardens.
In addition, a belt-shaped foam sheet and a resin film, which are separately produced, are overlapped with each other, and a heating roll heated to a predetermined temperature is rotated while contacting the resin film to contact the resin film. A method called thermal lamination in which a resin film is sequentially heat-pressed on a foam sheet by moving the position in the length direction of the resin film is known (see Patent Document 1 below).

  This method of heat laminating makes it easy to change the resin film to be bonded, and is suitable for multi-product small-volume production. For example, in the case of producing containers of different colors, an original fabric roll made of a foam sheet And a film roll in which the resin film to be bonded is wound up, and a laminating device is provided in front of the thermoforming device, and the resin film fed from the film roll is thermally laminated on the foam sheet fed from the raw fabric roll. Then, after the obtained laminated foam sheet is introduced into a thermoforming device to produce a predetermined number of containers, if only the film roll is replaced with the original fabric roll as it is, containers of different colors can be produced continuously. .

  Note that not only in such cases, but also in the case of producing a resin foam molded product with a laminated foam sheet, it is required to improve the manufacturing work efficiency, so the laminated foam sheet is formed by thermal lamination as described above. It can be said that a method of continuously thermoforming the obtained laminated foamed sheet is preferable.

However, in recent years, improvement in production technology has shortened the time required for molding in thermoforming equipment (tact time), and from the production of laminated foam sheets, resin foam molded products are finally laminated. In a series of flows up to the point where the foam sheet is taken out, the thermal laminating process is becoming the overall rate-limiting step.
To solve this problem, if the heat lamination time is shortened by increasing the number of rotations of the heating roller, the resin film is not sufficiently bonded to the foam sheet, and wrinkles are formed on the resin film during thermoforming. There is a risk of doing.
On the other hand, it is possible to increase the temperature of the heating roll to shorten the time required for thermal lamination, but in that case, when the line stops due to some trouble, the resin film becomes the heating roll. Since it stops in the state which contacted, it has a possibility that a resin film may be blown out.

  For this reason, a resin foam molded product is manufactured by supplying a laminated foam sheet obtained by heat laminating a resin foam sheet and a resin film to a thermoforming apparatus while producing a laminate foam sheet. In the production method, it has become difficult to efficiently produce a resin foam molded article having excellent quality.

JP 2010-046951 A

  The present invention has been made in view of the above problems, and a method for producing a resin foam molded product capable of efficiently producing a resin foam molded product having excellent quality, and a resin foam molded product. The issue is to provide manufacturing equipment.

The present invention relating to a method for producing a resin foam molded article for solving the above-mentioned problems is to heat a laminated foam sheet obtained by thermally laminating a resin film on the surface of a belt-shaped resin foam sheet to produce a laminated foam sheet. A method for producing a resin foam molded product, wherein a resin foam molded product is produced by thermoforming with a molding device, the preheating step of heating the surface of the resin foam sheet on which the resin film is thermally laminated before the thermal lamination. The preheating step conveys the resin foam sheet with the surface facing upward, and a radiant heater for heating the surface of the resin foam sheet in the conveying section is more than the resin foam sheet. Adjust the distance by a sheet position adjustment mechanism that can be arranged at the top and adjust the distance between the heated resin foam sheet and the radiant heater. It is characterized in that facilities.

Further, the present invention relating to the equipment for manufacturing a resin foam molded article includes a laminating apparatus for thermally laminating a resin film on the surface of a belt-shaped resin foam sheet to produce a laminated foam sheet, and thermoforming for thermoforming the laminated foam sheet. An apparatus, and the laminate apparatus and the thermal apparatus so that a resin foam molded product can be produced by thermoforming the laminated foam sheet with the thermoforming apparatus while producing the laminated foam sheet with the laminating apparatus. A molding equipment and a resin foam molded product manufacturing facility, further comprising a preheating device for heating the surface of the resin foam sheet on which the resin film is thermally laminated before the thermal lamination , An upstream side of the laminating apparatus is provided with a section in which the resin foam sheet is conveyed with the surface facing upward. A radiation heater for heating the surface is provided, the radiation heater is disposed above the resin foam sheet so that the surface of the resin foam sheet can be heated in the section, and The preheating device further includes a sheet position adjusting mechanism capable of adjusting a distance between the resin foam sheet to be heated and the radiation heater .

In the present invention, a preheating step is performed in which the surface of the foamed sheet on which the resin film is laminated is heated before the thermal lamination.
Therefore, when the resin film is superposed on the heated foam sheet, the heat of the foam sheet is received by the resin film, and the temperature rise of the resin film during thermal lamination can be promoted by the heat received from the foam sheet. .
That is, it is possible to reduce the time required for the thermal lamination while suppressing the possibility of inadequate adhesion between the resin film and the foamed sheet, and it is possible to efficiently produce a resin foam molded article having excellent quality.

The figure which shows the equipment structure used for the manufacturing method of the resin foam molded product of this invention ((a) top view, (b) front view). The enlarged view of the area | region shown by "X" in FIG.1 (b).

Below, the case where the foaming tray by which the container inner surface was comprised with the resin film is manufactured is demonstrated to an example about the manufacturing method of the resin foam molded product of this invention.
FIG. 1 is a diagram showing the configuration of equipment used in a foam tray manufacturing method, and the direction from the left side to the right side when viewed from the front is the flow direction of the manufacturing line.
1A is a plan view, and FIG. 1B is a front view.
FIG. 2 is an enlarged view of the area indicated by “X” in FIG. 1B, where FIG. 2A shows a state before the foam tray is manufactured, and FIG. It shows the inside.

In this figure, the code | symbol 1 represents the original fabric roll by which a long strip-shaped foam sheet is wound, and the code | symbol 2 represents the film roll by which a long strip-shaped resin film is wound.
Reference numeral 3 is a laminating apparatus for thermally laminating the foam sheet 11 fed out from the raw roll 1 and the resin film 21 fed out from the film roll 2, and reference numeral 4 denotes the laminating apparatus 3. It is a thermoforming apparatus for thermoforming the produced laminated foam sheet 12.
In the foam tray manufacturing facility according to the present embodiment, a preheating device 5 for heating the foam sheet 11 fed from the raw roll 1 is provided on the upstream side of the laminating device 3. .
Further, the foaming tray manufacturing facility according to the present embodiment includes a cutting device 6 that cuts the laminated foamed sheet 12 thermoformed by the thermoforming device 4 for each thermoforming portion of the thermoforming device 4; A punching device 7 for punching the laminated foamed sheet 12 cut by the cutting device 6 to cut out the foamed tray 10, a transport device 8 for transporting the foamed tray 10 cut by the punching device 7, and the foaming A crushing device 9 that crushes the end material (trimming loss) after the tray 10 is cut out is provided.

As shown in these drawings, the foaming tray manufacturing facility according to the present embodiment produces the laminated foamed sheet 12 by laminating the resin film 21 on the surface of the strip-shaped foamed sheet 11 with the laminating apparatus 3. However, the laminated foam sheet 12 obtained while being thermoformed by the thermoforming apparatus 4 is configured to produce a foamed tray 10 which is a resin foam molded product.
Specifically, the foaming tray manufacturing facility according to the present embodiment includes a preheating device 5, a laminating device 3, a thermoforming device 4, a cutting device 6, a punching device 7, from the upstream side to the downstream side in the line flow direction. It arrange | positions in order of the conveying apparatus 8, and the said manufacturing equipment is comprised so that the said original fabric roll 1 can be set in the further upstream rather than the said preheating apparatus 5. FIG.

In the present embodiment, the original roll 1 is arranged in such a manner that the central axis direction of the winding core is arranged substantially horizontally, and the central axis direction is orthogonal to the line flow direction. It is arranged so as to be rotatable around the central axis.
The raw roll 1 is set so that the foamed sheet 11 can be automatically fed out by rotating when the foamed sheet 11 is taken out by a laminating apparatus 3 to be described later, and the foamed sheet 11 is directed toward the laminating apparatus 3. 11 is arranged so that it can be sent out substantially horizontally.

  The film roll 2 is provided with a long strip-shaped resin film 21 having substantially the same width as that of the foamed sheet 11, and the film roll 2 has a roll 1 in the direction of the center axis of the winding core. Is disposed upstream of the laminating apparatus 3 in the line flow direction and vertically upward.

  That is, the foaming tray manufacturing facility in the present embodiment is configured to supply the laminating apparatus 3 with the resin film 21 laminated on the foamed sheet 11.

In the laminating apparatus 3, two rollers for sandwiching a laminate of the foam sheet 11 and the resin film 21 and thermally laminating the resin film 21 on the surface (upper surface) of the foam sheet 11 make a pair in the vertical direction. It is provided in shape.
Of these two rollers, the upper roller is a metal roller 31 whose surface temperature can be adjusted (hereinafter also referred to as “heating roller 31”), and the lower roller is a thin elastic layer on the surface of the metal roller. Is a roller 32 (hereinafter also referred to as “nip roller 32”).
Each of the heating roller 31 and the nip roller 32 is arranged with its central axis orthogonal to the length direction of the foam sheet 11, and the length is longer than the width of the foam sheet 11 or the resin film 21. It is provided so that they can be sandwiched over the entire width for a long time.

  The heating roller 31 and the nip roller 32 are provided in the laminating apparatus 3 so that the position of the heating roller 31 and the nip roller 32 can be adjusted in the vertical direction, and the foamed sheet 11 and the resin film 21 before the start of the production of the foaming tray 10 are set at a distance from each other. In addition to facilitating the work to be performed, the nip width and the pressure applied to the laminate of the foamed sheet 11 and the resin film 21 can be adjusted.

The laminating apparatus 3 is further provided with two rollers around which the resin film 21 fed from the film roll 2 is wound before being introduced between the heating roller 31 and the nip roller 32. One is a pressing roller 33 for bringing the resin film 21 into contact with the surface of the foamed sheet 11 immediately before the nip between the heating roller 31 and the nip roller 32, and the other roller is a resin film after thermal lamination. The expander roller 34 applies tension in the width direction to the resin film 21 between the film roll 2 and the pressing roller 33 so as to prevent wrinkles and the like from occurring.
The pressing roller 33 is disposed on the upstream side of the heating roller 31 with its lower end positioned slightly below the nip position of the foam sheet 11 by the heating roller 31 and the nip roller 32. It is provided so that the resin film 21 can be pressed against the foamed sheet 11 from above.

  Although not described in detail here, the laminating apparatus 3 includes a mechanism for controlling the surface temperature of the heating roller 31, a power mechanism for rotating each roller around its axis, and a mechanism for controlling the peripheral speed. Etc. are provided.

The preliminary heating device 5 for preheating the foamed sheet 11 on which the resin film 21 is thermally laminated by the laminating device 3 includes a position where the raw fabric roll 1 is disposed, and the laminating device 3 is disposed. The preheating device 5 is provided with a rectangular disk-shaped radiant heater 51 for radiantly heating the foamed sheet 11.
On the downstream side of the raw roll 1 and the upstream side of the laminating apparatus 3, there is provided a section where the foam sheet 11 is conveyed with the surface 11 a on which the resin film 21 is thermally laminated facing upward. The radiant heater 51 is arranged above the conveying position of the foam sheet 11 with the heat radiation surface 51 a facing the lower surface so as to face the surface 11 a of the foam sheet 11.

In the preheating device 5 in the present embodiment, a pair for prescribing the introduction position of the foam sheet 11 to the preheating device 5 with the foam sheet 11 sandwiched from above and below on the upstream side of the radiant heater 51. The guide roller 52 is provided.
The guide roller 52 is normally provided at a height position substantially the same as the nip position between the heating roller 31 and the nip roller 32 so that the foam sheet 11 can be held substantially horizontally with the laminating apparatus 3. It is arranged.

The radiant heater 51 is not arranged with the heat radiation surface 51a facing directly below, but is disposed with the heat radiation surface 51a slightly downstream from the bottom in the line flow direction. ing.
That is, the preheating device 5 is provided with the radiant heater 51 so that the heat radiation surface 51a has an inclination that rises in the line flow direction.
Accordingly, the radiant heater 51 is arranged so that the distance between the heat radiation surface 51a and the surface 11a of the foam sheet 11 increases as it moves downstream in the line flow direction.

However, the preheating device 5 has a mechanism 53 (hereinafter also referred to as “sheet position adjusting mechanism 53”) for lifting the foam sheet 11 from below, and the sheet position adjusting mechanism 53 and the foam sheet 11 are radiantly heated. It is formed so that the distance from the heat radiation surface 51a of the heater 51 can be adjusted.
More specifically, the sheet position adjusting mechanism 53 is disposed on the downstream side of the radiant heater 51 as opposed to the guide roller 52, and is disposed below the position through which the foam sheet 11 passes. Has been.
The guide roller 52 defines the position where the foam sheet 11 is introduced into the preheating device 5 in the vertical direction, whereas the sheet position adjusting mechanism 53 is configured so that the foam sheet 11 from the preheating device 5 The discharge position is defined in the vertical direction.

The sheet position adjusting mechanism 53 is in contact with the entire width of the foam sheet 11 on the lower surface side of the foam sheet 11, and a pair of arms that support both ends of the holding roller 53a and the holding roller 53a for lifting the foam sheet 11 from below. 53b and a base 53c that supports the arm.
The arm 53b is composed of a rod-like body extending in the vertical direction, and supports the holding roller 53a at its upper end, and the lower end is fixed to the base 53c.
In addition, the sheet position adjusting mechanism 53 is configured to move the holding roller 53a up and down by moving the fixing position of the arm 53b to the base 53c up and down, and the surface 11a of the foam sheet 11; The foamed sheet 11 can be lifted up to a state where the heat radiation surface 51a of the radiation heater 51 is substantially parallel.

The foam sheet 11 is lifted by the sheet position adjusting mechanism 53 so that the heat radiation surface 51a of the radiant heater 51 and the foam sheet 11 are substantially parallel to each other, so that the guide roller 52 to the pressing roller 33 of the laminating apparatus 3 are provided. The foam sheet 11 is bent in a mountain shape between the two.
Therefore, in the pressing roller 33, when the foam sheet 11 is lifted by the sheet position adjusting mechanism 53, the section around which the foam sheet 11 is wound becomes long, and the heat received by the foam sheet 11 from the radiation heater 51 is the resin film 21. It becomes easy to be transmitted.

  The thermoforming device 4, the cutting device 6, the punching device 7, the conveying device 8, and the crushing device 9 other than the preheating device 5 have been conventionally used in the production of foam trays. Can be used.

  For example, in the case of the thermoforming device 4, heating zones 41 a, 41 b, 41 c for heating the laminated foam sheet 12 from the upstream side to a temperature at which thermoforming is possible, and a product (foam tray) shape on the laminated foam sheet 12. It is possible to employ one having a molding zone 42 provided with a molding die 46 for forming.

  Moreover, if it is the said cutting device 6, the thing which has a straight blade for cutting the laminated foam sheet 12 in the width direction of the laminated foam sheet 12, the thing which has a rotary blade, etc. are mentioned, for example, The said punching apparatus 7 If so, what is provided with a punching blade mold 71 for punching a product from a laminated foam sheet having a product shape and a support plate 72 for sandwiching the laminated foam sheet between the punching blade mold 71, etc. Can be adopted.

The thermoforming apparatus 4 is provided with a transport mechanism (not shown) for pulling the laminated foam sheet 12 and transporting it from the heating zone 1 to the molding zone 42. The laminated foam sheet 12 is configured to be so-called intermittently fed.
That is, in the present embodiment, the laminated foam sheet 12 is drawn into the length thermoforming device 4 required for one-shot thermoforming in the thermoforming device 4 and the thermoforming in the thermoforming device 4 ( And while the laminated foam sheet is punched out), a production facility configured to produce the foam tray 10 by alternately repeating the operation of stopping the laminated foam sheet 12 is used.

A foaming tray manufacturing method using such a manufacturing facility will be described. First, the foamed sheet 11 is unwound from the raw roll 1 and passed through the preheating device 5 and the laminating device 3 to heat the tip. The resin film 21 is fed out from the film roll 2 at the entrance of the molding apparatus 4 and passed through the laminating apparatus 3 and set in the conveyance mechanism of the thermoforming apparatus 4.
At this time, the holding roller 53a of the sheet position adjusting mechanism 53 is lowered, and the radiation heater 51 is kept away from the foam sheet 11.
Further, the heating roller 31 and the nip roller 32 of the laminating apparatus 3 are also opened, and the power source of the heater provided in the heating zone of the thermoforming apparatus 4 and the power source of the heating roller 31 and the radiant heater 51 are also provided. And wait until each reaches a predetermined temperature.

Thereafter, when the heating zone of the thermoforming device 4, the heating roller 31, and the radiant heater 51 are stabilized at a predetermined temperature, the laminating device 3 is started and the gap between the heating roller 31 and the nip roller 32 is set at a predetermined interval. The foamed sheet 11 and the resin film 21 are brought into pressure contact with each other between them, and the heating roller 31 and the nip roller 32 are rotated at a predetermined peripheral speed.
Thus, the foamed sheet 11 and the resin film 21 are taken up, and the laminated foamed sheet 12 can be formed on the downstream side of the heating roller 31 at a constant speed.
For smooth production, the length of the laminated foam sheet 12 formed per unit time by the laminating apparatus 3 is adjusted based on the average speed of the laminated foam sheet 12 intermittently fed to the thermoforming apparatus 4. Usually, it is necessary to adjust the discharge speed of the laminated foam sheet 12 from the laminating apparatus 3 and the average speed of the laminated foam sheet 12 intermittently fed to the same speed.

Further, in order to prevent the vibration due to intermittent feeding of the laminated foam sheet 12 to the thermoforming apparatus 4 from adversely affecting the thermal lamination, the transport mechanism of the thermoforming apparatus 4 is changed when the laminating apparatus 3 is started. It is possible to operate the transport mechanism after waiting until a laminated foam sheet 12 having a length longer than that required for one-shot thermoforming is formed at least between the laminating apparatus 3 and the thermoforming apparatus 4 without being operated. Preferably, it is preferable to carry out thermoforming in the thermoforming device 4 while maintaining a state in which a certain amount of the laminated foam sheet 12 is always stored between the laminating device 3 and the thermoforming device 4.
At this time, by raising the holding roller 53a of the sheet position adjusting mechanism 53, the position of the foamed sheet 11 in the preheating device is brought close to the heat radiation surface 51a of the radiant heater 51, and the preheating device 5 The process of heating the surface 11a of the foamed sheet 11 on which the resin film 21 is laminated before heat lamination (hereinafter also referred to as “preheating process”) speeds up the heat lamination, that is, the production efficiency of the foam tray 10 Important for up.

The preheated foam sheet 11 is automatically taken up by the laminating apparatus 3 as the heating roller 31 and the nip roller 32 in the laminating apparatus 3 rotate, and is applied to the surface 11a heated by the pressing roller 33. The resin film 21 is superposed.
Thereafter, the laminated body in which the resin film 21 and the foamed sheet 11 are superposed can be passed between the heating roller 31 and the nip roller 32 to perform thermal lamination, thereby forming the laminated foamed sheet 12.
The obtained laminated foam sheet 12 is intermittently fed to the thermoforming device 4, heated and softened in the heating zone, and a tray shape is formed in the forming zone 42.
In addition, the laminated foam sheet that has passed through the molding zone 42 is continuously cut by the cutting device 6 to the length of one shot in the thermoforming device 4, and then the portion where the tray shape is formed in the punching device 7. It is punched by the punching blade die 71 and becomes a scrap 12w and is crushed by the crushing device 9.
On the other hand, the punched foam tray 10 is transported by the transport device 8 to a place where the next process such as product inspection and packing is performed.

  As described above, the laminated foam sheet 12 obtained by thermally laminating the resin film 21 on the surface 11a of the belt-like foam sheet 11 to produce the laminated foam sheet 12 is thermoformed by the thermoforming apparatus 4 to produce a foam tray. In doing so, the formation speed of the laminated foamed sheet 12 in the laminating apparatus 3 is made higher than before while suppressing the possibility of insufficient adhesive force between the resin film 21 and the foamed sheet 11 by performing the preheating step as described above. Can be improved.

That is, when the resin film 21 is superimposed on the heated foam sheet 11 by the pressing roller 33, the heat of the foam sheet 11 can be transmitted to the resin film side. 21 will be preheated.
Accordingly, the temperature rise of the resin film 21 during heat lamination can be promoted by the heat received from the foamed sheet 11, and the peripheral speed is increased more than before while the surface temperature of the heating roller 31 is set to the same set temperature as before. Even if it makes it, the condition of a heat | fever lamination can be made into the same thing as the past.

In addition, by preheating the surface of the foam sheet 11, the pressure in the bubbles near the surface can be improved and tension can be generated on the surface of the foam sheet 11. Can be made.
That is, the repulsive force of the foam sheet 11 when passing between the heating roller 31 and the nip roller 32 can be increased, and this repulsive force can be effectively used for thermal lamination.

Such an effect does not occur only when the foam sheet 11 and the resin film 21 are brought into contact with each other in advance by the pressing roller 33, but only when the heat lamination is performed by the heating roller 31. This is also an effect that occurs even in the case of contact with.
What is necessary is just to select suitably the heating temperature of the foam sheet in the preheating process for producing such an effect with the material, thickness, etc. of the foam sheet and the resin film laminated on the foam sheet.

  For example, in general foam trays, styrene resins are used as the material for forming them. For example, general-purpose polystyrene resins (GPPS), which are styrene homopolymers, and resins called heat-resistant polystyrene resins are used. Has been.

  If the foam sheet 11 is mainly composed of a styrene homopolymer, and the resin film 21 is a styrene resin film or a laminated film of a styrene resin film and another resin film. The preheating step is preferably performed so that the temperature of the surface 11a is 65 ° C to 85 ° C before being overlaid on the resin film.

  The foamed sheet 11 may be a mixed resin of a styrene homopolymer and a polyphenylene ether resin, a styrene-unsaturated carboxylic acid copolymer resin (for example, a styrene-methacrylic acid copolymer resin, a styrene-maleic anhydride copolymer resin). Styrene-maleimide copolymer resin, etc.) and a heat-resistant polystyrene resin foamed sheet mainly composed of the heat-resistant polystyrene resin having a Vicat softening temperature of 110 to 155 ° C. based on JIS K7206 (Method B, 50 ° C./h). If it is, it is preferable to implement the said preheating process so that the temperature of the said surface 11a may be 65 to 85 degreeC.

  Furthermore, when the foamed sheet 11 is a polypropylene resin foamed sheet mainly composed of polypropylene resin, the preheating step may be performed so that the temperature of the surface 11a is 65 ° C to 95 ° C. Preferably, when the foamed sheet 11 is a polyethylene resin foamed sheet having a polyethylene resin as a main component, the preheating step is performed so that the temperature of the surface 11a is 65 ° C to 85 ° C. preferable.

  In addition, even when a foam sheet of any material is used, it is possible to increase the speed when heat laminating a resin film. Therefore, when making a resin foam molded product such as a foam tray, It can be avoided that the process is rate-limiting and the overall efficiency is reduced, and there is no change in that the effect that the production speed of the resin foam molded product can be improved is exhibited.

In the present embodiment, the case where the preheating device 5 having the above-described configuration is used as an example of performing the preheating step is illustrated, but the preheating device to be used needs to be as illustrated above. Absent.
For example, it is possible to employ a preheating device in which the sheet position adjusting mechanism 53 is not provided.
However, since the foamed sheet 11 is normally kept stationary at the stage of preparing the foam tray 10, if the energized radiant heater 51 is brought close to the foamed sheet 11 at this stage, the foamed sheet 11 is used. 11 may have an excessive temperature rise.
On the other hand, in order to avoid an increase in the temperature of the foam sheet 11, if the manufacture of the foam tray 10 is started and the radiant heater 51 is not energized until the foam sheet 11 is moved, the radiant heater is brought to a predetermined temperature. Until the temperature of 51 rises, good products cannot be obtained, and raw materials such as foam sheets and resin films are wasted.
In this respect, it is preferable to employ a preheating device provided with a sheet position adjusting mechanism 53 capable of adjusting the distance from the radiant heater as shown in the present embodiment.

  In the present embodiment, a section is provided in which the foamed sheet 11 for thermally laminating the resin film 21 is conveyed with its surface 11a facing upward, and the heat radiation surface 51a is provided so as to face the surface 11a in this section. Although provided, for example, a section in which the foam sheet is conveyed in the vertical direction may be provided, and a radiant heater may be provided in the section so as to face the foam sheet, and the preheating step may be performed.

In the present embodiment, the radiant heater is disposed with the heat radiation surface 51a facing downward. However, the radiant heater is disposed below the foam sheet 11, and the lower surface side of the foam sheet is disposed. The surface 11b may be heated, and the resin film 21 may be heat laminated on the surface 11b on this side.
A mode in which a radiation heater for heating the surface of the foam sheet is disposed on the lower surface side of the foam sheet 11 is not only the radiation heat emitted from the radiation heater, but also by heating the surrounding air by the radiation heater. It can be said that it is excellent in that heat transfer by the generated convection can be effectively used for preheating of the foam sheet.
However, since heat conduction by convection is easily affected by surrounding air currents, the surface temperature of the foam sheet is more accurate when radiation heating is performed from above the foam sheet as in the embodiment of the present embodiment. Can be controlled.

  In addition, in the point where it is difficult to be affected by convection, the same applies to the case where the foam sheet is conveyed in the vertical direction and the radiant heater is arranged on the side of the foam sheet, as described above, When a radiant heater is installed, if the tension applied to the foam sheet in the lengthwise direction is loosened and "sagging" occurs in the foam sheet, the foam sheet and the radiant heater come into contact with each other, possibly causing a fire. Therefore, it is desirable to heat from above the foam sheet as in the embodiment of the present embodiment.

In this embodiment, a radiant heater is used as a mechanism for heating the foam sheet. For example, a preheating device is provided with another heating mechanism such as a preheating roller. Is also possible.
Furthermore, in this embodiment, the foamed tray is illustrated as the resin foam molded product. However, in the present invention, the resin foam molded product to be manufactured is not limited to the foamed tray.
In addition, although not described in detail here, with respect to the conventionally known matters regarding the production method and production equipment of the resin foam molded product, the method for producing the resin foam molded product of the present invention is not limited to the extent that the effects of the present invention are not significantly impaired. It can also be used in manufacturing equipment.

1: raw fabric roll, 2: film roll, 3: laminating apparatus, 4: thermoforming apparatus, 5: preheating apparatus, foam tray, 11: foam sheet (resin foam sheet), 11a: surface, 12: laminated foam sheet , 21: Resin film, 51: Radiant heater

Claims (2)

Manufacture of a resin foam molded product in which a laminated foam sheet obtained by heat laminating a resin film on the surface of a strip-shaped resin foam sheet is thermoformed with a thermoforming device to produce a resin foam molded product. A method,
Performing a preheating step of heating the surface of the resin foam sheet on which the resin film is thermally laminated before the heat lamination, the preheating step transporting the resin foam sheet with the surface facing upward; and The distance between the heated resin foam sheet and the radiant heater can be adjusted by placing a radiant heater that heats the surface of the resin foam sheet above the resin foam sheet in the conveying section. A method for producing a resin foam molded product, wherein the distance is adjusted by a simple sheet position adjusting mechanism . A laminating apparatus for producing a laminated foamed sheet by thermally laminating a resin film on the surface of a belt-shaped resin foamed sheet and a thermoforming apparatus for thermoforming the laminated foamed sheet are provided. Production equipment for a resin foam molded product in which the laminating device and the thermoforming device are arranged so that a resin foam molded product can be produced by thermoforming the laminated foam sheet with the thermoforming device while producing a sheet Because
A pre-heating device is further provided for heating the surface of the resin foam sheet on which the resin film is heat-laminated before the heat lamination, and the resin foam sheet faces the surface upward on the upstream side of the laminator. There is a section to be transported towards the
The preheating device is provided with a radiant heater for heating the surface, and the radiant heater is disposed above the resin foam sheet so as to heat the surface of the resin foam sheet in the section. And
The preheating device further comprises a sheet position adjusting mechanism capable of adjusting a distance between the resin foam sheet to be heated and the radiant heater .

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