JP2771473B2 - Manufacturing method of foamed resin products with labels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a foamed resin product with a label used for a cup container for instant noodles, a cup for beverages such as juice or hot coffee, a container for frozen desserts and other packaging containers. In particular, the present invention relates to a method for producing a labeled foamed resin product having a label on which a display of characters, patterns, designs, and the like is printed in advance.

[0002]

2. Description of the Related Art Foamed bead cups are widely used as containers for instant noodles and cups for drinks such as juice.

[0003] The foamed bead cup is generally made by pre-foaming foamable resin particles (beads) in which a volatile foaming agent such as butane or pentane is added to polystyrene resin particles to obtain pre-foamed particles. Is filled in a cavity of a molding die, and is heated and foamed by a heating medium such as steam or the like.

Some of such foamed bead cups display characters such as a brand name and a manufacturer, or other surface designs such as pictures and patterns.

[0005] As a method of providing the display on the surface of the foamed bead cup, a method of directly printing the displayed content on the surface of the foamed bead cup by a printing machine, a method of bonding a label on which the displayed content is pre-printed to the foamed bead cup, There is known a so-called shrink label method in which a heat-shrinkable film on which display contents are printed in advance is wound around a foamed bead cup and then heated and shrunk to be attached.

[0006]

However, the above conventional structure has the following problems.

That is, in the method of printing directly on the surface of the foamed bead cup, it is difficult to perform clear printing such as gravure printing or multicolor overlapping printing. Therefore, there is a problem in that it is almost impossible to display very fine characters and to display the transition of gradation change smoothly.

[0008] In the method of bonding a label on which the display contents are printed in advance to the foamed bead cup, the label portion protrudes from the foamed bead cup by the thickness thereof, which is unsightly. Further, if the adhesion between the foamed bead cup and the label is insufficient, the label may be peeled off at the stage of distribution or use, causing a problem that the commercial value is reduced.

In the shrink label method using a heat-shrinkable film, the heat-shrinkable film is merely attached to the cup due to heat shrinkage. Therefore, when the outer peripheral surface of the cup is inclined, the film is removed from the cup. Easy to detach. Further, when the shrinkage of the heat-shrinkable film is not uniform, since the film is deformed, it is difficult to read the display contents pre-printed, and it is almost impossible to read fine characters. doing.

Therefore, in order to solve these problems,
In the method for painting a foam-molded container disclosed in Japanese Patent Application Laid-Open No. 4-331132, a tubular paper-made printing sheet having a printing layer and a heat-sealing layer is set in a female cavity. The printing sheet is fixed to the inner surface of the cavity of the female mold by evacuating the interior of the cavity from a number of vent holes provided in the female mold. Then, the female mold and the male mold are matched, and foaming resin particles are filled between the paper print sheet and the male mold core to perform foam molding. As a result, the heat seal layer of the printing sheet is fused to the cylindrical foam molded container, so that the cylindrical foam molded container can be painted with clear printing without distortion.

However, according to this method, the printing sheet can be fixed to the inner surface of the female cavity. However, the accuracy of the printing sheet is large. There is a problem that a gap is easily generated between the inner surface of the tee and the tee. If there is a gap, the expandable resin particles enter the gap and cover the printing sheet, so that a good molded container cannot be obtained.

Further, in the above-mentioned method, since a paper-made printing sheet having a printing layer on the outside of the core paper is used, the moisture-proof property and the gas barrier property are inferior. Further, the paper used in molding the foamed resin product may absorb moisture due to the steam used, and the printing may be blurred. In addition, since the printing layer is provided outside the core paper and the printing layer is in direct contact with the female mold, the printing ink is easily transferred to the female mold by heat. When this transfer occurs, the printing of the foamed resin product becomes thin, resulting in poor printing. Further, since the ink transferred to the female mold is re-transferred to the surface of the next molded product, printing failures occur continuously.

Further, the printing sheet needs to be formed into a printing sheet made of tubular paper, and the sheet cannot be used as it is.

The present invention solves the above-mentioned conventional problems and has a label in which fine character display and a clear design display in which a change in gradation is smoothly expressed are printed in advance, and the label is a foamed resin product. The present invention provides a method for producing a labeled foamed resin product which is beautiful and hard to peel off from the surface of the product.

[0015]

According to a first aspect of the present invention, there is provided a method of manufacturing a foamed resin product using a mold comprising a male mold and a female mold. In the method for manufacturing the label, the space between the label in contact with the inner surface of the female mold cavity and the groove formed along the end of the label on the inner surface of the female mold cavity is decompressed, so that the label is removed from the cavity. After temporarily fixed to the inner surface of the tee, the cavity is filled with pre-expanded particles and subjected to heat foam molding to produce a foamed resin product with a label adhered to the foamed resin product.

According to a second aspect of the present invention, there is provided a method of manufacturing a foamed resin product using a molding die comprising a male mold and a female mold. A first step of wrapping the label around a pseudo male mold having an air hole on the side surface and sucking the label from the air hole to tightly fix the label to the pseudo male mold, and after the first step, inserting the pseudo male mold into the female mold At the same time, pressurized air is blown out from the air holes of the pseudo male mold, and at the same time, the space between the label in contact with the inner surface of the female mold cavity and the groove formed along the label end on the inner surface of the female mold cavity is reduced. And transferring the label to the inner surface of the cavity and temporarily fixing the label.
After the step, a third step of extracting the pseudo male mold from the female mold, and after the third step, the male mold and the female mold for molding are matched and the mold is clamped. By this, a fourth step of manufacturing the foamed resin product and simultaneously attaching the label to the foamed resin product is provided.

According to a third aspect of the present invention, there is provided a method of manufacturing a foamed resin product, wherein a fan-shaped label is wound around a pseudo male type in the first step in order to solve the above-mentioned problems.

[0018]

According to the first aspect of the present invention, the space between the label in contact with the inner surface of the female mold cavity and the groove formed along the end of the label on the inner surface of the female mold cavity is reduced in pressure. Thereby, since the label is temporarily fixed to the inner surface of the cavity, no gap is generated between the label end and the inner surface of the cavity. Thereby, even if the pre-expanded particles are filled, the pre-expanded particles do not enter between the label and the inner surface of the female mold cavity. In this state, heat foam molding,
Since a foamed resin product with a label in which a label is adhered to a foamed resin product is manufactured, there are no air bubbles between the label and the foamed resin product, and the label cannot be wrinkled. In other words, the label does not protrude from the surface of the foam resin product, is beautiful,
In addition, peeling is difficult. As a result, it is possible to easily manufacture a foamed resin product such as a container having a label on which a display of fine characters, a clear display in which a change in gradation is smoothly expressed, and a display by multicolor overlay printing or the like is printed.

According to the second aspect of the invention, in addition to the above operation, the label is transferred from the pseudo male type to the female type using the pseudo male type, so that the label is shifted to the inner surface of the cavity. And can be temporarily fixed easily. Thereby, a labeled foamed resin product can be efficiently manufactured.

According to the third aspect of the invention, in addition to the above operation, the fan-shaped label is wound around the pseudo male type.
When manufacturing a tubular foamed resin product such as a cup container, it is not necessary to prepare a label processed into a tubular shape in advance. Therefore, the manufacturing process can be simplified.

[0021]

EXAMPLES Hereinafter, the method for producing the labeled foamed resin product of the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.

The method for producing a cup-shaped foamed resin product with a display (hereinafter referred to as a foamed bead cup) of this embodiment is as follows.
A step of winding a fan-shaped label around a pseudo core (pseudo male type) having an air hole on the side and sucking the label from the air hole to tightly fix the label to the pseudo core; The suction from the air hole is stopped, and then the pressurized air is injected from the air hole, and at the same time, the label abutting on the inner surface of the female mold cavity and the groove formed along the label end on the inner surface of the female mold cavity are formed. The space between the molds is decompressed to transfer the labels to the inner surface of the cavity and temporarily fix them, the step of extracting the pseudo core from the female mold, and the step of forming the female mold and the molding core mold (male mold). After joining and closing the mold, pre-expanded particles are filled and subjected to heat expansion molding to produce a foamed resin product and, at the same time, to adhere a label to the foamed resin product.

In the step of tightly fixing the label to the pseudo core, as shown in FIG.
, A pseudo core 10 for inserting a label is used.
The shape of the air hole 10b may be, for example, an elongated groove shape as shown in FIG. 5A, or a circular shape as shown in FIG.

The pseudo core 10 is manufactured to be larger than the molding core mold. As shown in FIG. 2, an air chamber 10c is provided inside the pseudo core 10, and the pseudo core 1
A passage 10a for reducing or increasing the pressure of the air chamber 10c is provided at the bottom of the zero. Thus, when the vacuum valve of the simulated core 10 is opened, the simulated core 10
The pressure in the air chamber 10c can be reduced.
The pressure in the air chamber 10c of the pseudo core 10 can be increased through a.
The air holes 10b communicate with the air chamber 10c.

As a result, a label on which a predetermined content such as a character, a pattern, and a design is separately printed in advance is wound around the side surface of the pseudo core 10, and the air chamber 10c is closed.
If the pressure is reduced to a pressure of 0 to 740 mmHg, the label 11 can be tightly fixed to the side surface of the pseudo core 10. The pressure in the air chamber 10c is determined by the thickness (weight) of the label 11.
May be set appropriately according to the conditions.

In the next step, as shown in FIG. 3, the pseudo core 10 is inserted into the female mold 1, and then the air chamber 10c is pressurized. As a result, the blast air from the air holes 10 b presses the label 11 against the inner surface of the cavity of the female mold 1.

As shown in FIG. 4, the female mold 1 has annular grooves 1e, 1e formed in the inner surface of the cavity along the upper and lower ends of the label 11 in contact with the inner surface of the cavity.
A vertical groove 1f formed on the inner surface of the cavity along the left and right ends of the label 11, a space between the label 11 and the annular groove 1e in contact with the inner surface of the cavity, and
Suction ports 1d are provided for reducing the pressure in the space between the label 11 and the vertical groove 1f. The female mold 1 has a steam chamber 1a inside, a filling device (not shown) for filling the raw material into the cavity 3 through the passage 7, a supply port 1b for steam and cooling water, A drain discharge port 1c and an air supply port (not shown) for transferring a molded product to the core mold 2 are provided.

As shown in a partially enlarged view of FIG. 5, the annular groove 1e is 0.1 to 2 mm from the upper end (lower end) of the label 11.
At a position corresponding to 0.2 to 0.5 mm
And has a width and depth of 0.1 to 1 mm.

The vertical groove 1f extends from the left and right ends of the label 11
Formed at a position corresponding to 3 mm, and 0.1 to 1 m
m width and depth. Two vertical grooves 1f
Is set to 1 to 5 mm.

When pressure is applied from the passage 10b of the pseudo core 10 and vacuum suction from the suction port 1d of the female die 1 is started, the label 11 separates from the pseudo core 10 and, as shown in FIG. Is transferred to the inner surface of the cavity and temporarily fixed.

When the label 11 is provided on the entire side surface, it is preferable that the left and right ends of the label 11 be overlapped to some extent while being temporarily fixed to the inner surface of the cavity. In addition, by providing an overlap margin, one of the two vertical grooves 1f
It is possible to omit books. That is, the label 11
If the space between the end of the upper label 11 and the vertical groove 1f is decompressed in a state where the left and right ends of the label are overlapped, the upper end of the label 11 The end of the lower label 11 can be pressed against the inner surface of the cavity. Therefore, one vertical groove 1f
Thus, the label 11 can be temporarily fixed to the inner surface of the cavity.

However, if the overlapping margin is too large, the waste portion of the label 11 increases, which is uneconomical.
From the above, it is desirable to set the overlap margin to 0 to 10 mm.

In the step of manufacturing a cup-shaped molded product, the pseudo core 10 is extracted from the female mold 1, the female mold 1 and the molding core mold 2 are aligned, and the mold is clamped. This includes, for example,
Press equipment for bead foam molding is used. The press device includes, for example, an upper fixed platen 4 and a lower moving platen 5 which moves up and down by a ram 6, as shown in FIG. 7, and the female die 1 is fixed to the fixed platen 4, The mold 2 is fixed to the moving board 5. When the female mold 1 and the core mold 2 are clamped, a cup-shaped cavity 3 is formed therebetween.

The core mold 2 has a steam chamber 2a inside, a supply port 2b for steam and cooling water, and a drain discharge port 2a.
c, equipped with a discharge air port (not shown). Furthermore, although not shown, various pressure reducing valves (regulators) such as a filling air valve, a steam valve, a direct heating valve, a drain valve, a cooling water valve, a discharge air valve, and a solenoid valve of the cavity portion 3, and a solenoid valve are provided. It has a control panel to control.

As shown in FIG. 8, the molded article was prefoamed by using a polystyrene resin particle having a diameter of 0.25 mm containing a foaming agent as a raw material and preliminarily foaming it to a bulk factor of 12 (diameter of 0.57 mm). A foamed bead cup having a foaming ratio of 12 times manufactured by in-mold bead foaming molding method, wherein the top is φ96 mm, the bottom is φ68 mm, and the height is 10 mm.
7 mm, body thickness 2 mm.

The resin constituting the expandable thermoplastic resin used as the raw material of the expanded bead cup includes polystyrene resins such as polystyrene, high-impact styrene, styrene-maleic anhydride copolymer, styrene-acrylonitrile copolymer and the like. , Polyethylene, polypropylene,
There is no particular limitation as long as the resin can contain a foaming agent and can be formed into beads in a mold, such as a polyolefin-based resin such as an ethylene-vinyl acetate copolymer and a mixture of these resins.

The molding of the molded article is specifically carried out, for example, as shown in Table 1.
It is implemented according to.

[0038]

[Table 1]

First, a fan-shaped label 11 is wound around the pseudo core 10. That is, a roll film on which the display contents of characters, patterns, designs, etc. are printed in advance is trimmed by setting it on a press having a Thomson blade, and trimming the same as the body of the molded product, or with the body of the molded product. A fan-shaped label 11 having an overlapping portion is formed. Then, by opening the vacuum valve of the pseudo core 10 to reduce the pressure in the air chamber 10c, the label 11 is sucked from the air holes 10b and wound around the pseudo core 10.

In this embodiment, as the label 11,
It is made of polypropylene with a thickness of 30 μm on which the back side printing is performed, and a vinyl acetate / ethylene copolymer which is an adhesive layer having a thickness of 30 μm formed on the polypropylene,
A film having a total thickness of 60 μm was used. Label 1
In the case where the resin constituting the resin 1 and the resin constituting the foamed bead cup are of the same quality, or when a printing ink having excellent adhesiveness is used, it is also possible to thermally fuse the two at the time of molding. However, when it is difficult to heat-bond to the foam bead cup, an adhesive layer for heat-sealing may be provided on the back side of the label 11 in order to further ensure adhesion to the foam bead cup. The total thickness of the label 11 is 10 μm or more.
Molding is possible at 1 mm, but those having a thickness of 50 to 100 μm are more preferred.

Thereafter, the forward valve of the pseudo core 10 is opened, the pseudo core 10 is inserted into the female die 1, and the pseudo core 10 and the female die 1 are closed. Then, by closing the vacuum valve of the pseudo core 10 and opening the pressurizing valve, air is injected from the air holes 10b to transfer the label 11 from the pseudo core 10 to the female mold 1, and at the same time, the vacuum valve of the female mold 1 , The space between the label 11 and the groove 1e is reduced in pressure through the suction port 1d. Thereby, the label 11 can be temporarily fixed to the inner surface of the cavity 3 of the female mold 1. Then, the pseudo core 10 is extracted.

Subsequently, the female mold 1 and the core mold 2 are closed, the filling air valve is opened, and the cavity 3 is filled with the pre-expanded particles. Then, steam is introduced into the steam chamber 1a of the female mold 1 and the steam chamber 2a of the core mold 2 and heated. At this time, the drain valve is opened to discharge the condensed water.

Next, the direct heating valve is opened, and the cavity 3 is directly heated. When the foamed particles fuse with each other, the cooling water valve is opened to cool the whole. After cooling, the discharge air valve is opened, and the molded product is transferred to the core mold 2 and discharged. Then, the movable platen 5 is lowered by the ram 6, the mold is opened, and the molded product is taken out.

A comparative experiment of moisture proof performance was performed between the foamed resin cup having the label 11 provided on the entire side surface manufactured as described above and the foamed resin cup manufactured by using the same apparatus without labeling.

The cup is made of expanded polystyrene particles having a preliminary expansion ratio of 12 times, and the label 11 has a thickness of 6 times.
A polypropylene sheet having a back surface of 0 μm and a hot melt process was used. CaCl ₂ was added to each of the five cups produced.
, And the opening of the cup is covered with aluminum foil and sealed, and then left at a temperature of 40 ° C and a humidity of 90% for 72 hours.
The increase in weight due to moisture absorption was measured. Table 2 shows the results.

[0046]

[Table 2]

The 24-hour average moisture permeability (x) of the foamed resin cup with a label is about one fifth of that of the foamed resin cup without a label, and it was confirmed that a foamed resin cup with a label having excellent moisture-proof performance can be manufactured. Was.

As described above, according to the manufacturing method of this embodiment, the space between the annular groove 1e formed on the inner surface of the cavity of the female die 1 along the upper and lower ends of the label 11 and the label 11 is reduced. Thus, the label 11 is temporarily fixed to the inner surface of the cavity. Therefore, label 1
1 closely adheres to the inner surface of the cavity, and a gap is hardly generated between the end of the label 11 and the inner surface of the cavity. Accordingly, it is difficult for the pre-expanded particles to enter between the label 11 and the inner surface of the cavity, so that a good molded container can be obtained.

Further, according to the present embodiment, the foamed resin product with the label can be efficiently molded in a small number of steps, and the label 11 can be easily peeled off without shifting the position of the label 11 in the product. I do not even do. In addition, it is possible to easily manufacture a container or the like having a label 11 on the surface on which a display of fine characters, a clear display that smoothly expresses a change in gradation, and a display by multicolor overlay printing or the like is printed. Furthermore, since there is no air bubble between the label 11 and the foamed resin product, and the label 11 cannot be wrinkled,
It is beautiful.

Further, since the label 11 on which the back side printing is performed is used, the ink of the printing layer is heated by the female mold 1 by heat.
Will not be transferred to Therefore, printing failure due to transfer does not occur, and a foamed resin product with a label can be efficiently manufactured. In addition, by using a resin instead of paper for the label 11, when molding a foamed resin product, moisture is less likely to be absorbed even when steam heating is performed.

A molded article integrally formed with the label 11 on the entire side surface using a material having excellent gas barrier properties as the label 11 is particularly excellent in moisture-proof and gas-blocking effects and is suitable as a food container which can be stored for a long period of time. Can be used for

The label 11 may be provided partially instead of the entire side. For example, the shape of the label 11 may be shorter than the height of the body of the molded product as shown in FIG. When provided only in the center of the body of the molded article in this way, it is possible to prevent swelling of the molded article due to moisture absorption of contents such as ramen, and to provide only at the upper part of the body of the molded article. In this case, the strength of the opening of the molded product is reinforced, and a more inexpensive molded product can be obtained.

In the above embodiment, the label 11 comprises a base material layer (a transparent resin layer having a printed layer on the back surface) and, if necessary, an adhesive layer laminated on the back surface side of the base material layer. And those having a multi-layer structure. Such a label 11 has a fan shape before fusion with the foamed resin particles in the mold, and can be integrated with the container after fusion without being formed into a cylindrical shape. More specifically, it is preferable to use a label 11 having the following structure.

Materials used for the label 11 include polystyrene, polypropylene, high-density polyethylene, polyvinyl chloride, polyethylene terephthalate,
A resin film in which an inorganic fine powder is contained in a thermoplastic resin having a melting point of 135 to 264 ° C. such as polyamide or the like, or a film in which an inorganic filler-containing latex is applied on the surface of the resin film; Alternatively, a material obtained by depositing aluminum on the resin film can be used. Such a base material layer may be a single layer or a laminated structure of two or more layers.

On the back side of the base layer (the side in contact with the resin container), if necessary, low-density polyethylene, vinyl acetate / ethylene copolymer, ethylene / (meth) acrylic acid copolymer which becomes an adhesive layer And a metal salt of an ethylene / (meth) acrylic acid copolymer. Among them, a heat sealing resin having a melting point of 85 to 135 ° C. can be preferably used.

As described above, the printing layer 11 is formed on the back surface of the transparent resin layer 11a made of a resin film (or sheet).
By using the label 11 (see FIG. 10) in which b is arranged, it is possible to obtain a foamed resin product with a label which is hardly stained and which is always beautiful.

[0057]

As described above, the method for manufacturing a foamed resin product according to the first aspect of the present invention forms a label in contact with the inner surface of a female mold cavity and a label on the inner surface of the female mold cavity along a label end. After the label is temporarily fixed to the inner surface of the cavity by reducing the pressure between the groove and the groove, the cavity is filled with pre-expanded particles and heated and foamed, whereby the label is applied to the foamed resin product. This is a configuration for producing a bonded foam resin product with a label.

According to this, there is no gap between the end of the label and the inner surface of the cavity. Therefore, even if the pre-expanded particles are filled, the space between the pre-expanded particles and the inner surface of the female mold cavity is not increased. Will not get into it. Since a foamed resin product with a label in which a label is adhered to a foamed resin product is produced by heating and foaming molding in this state, there are no air bubbles between the label and the foamed resin product, and the label cannot be wrinkled. That is, the label does not protrude from the surface of the foamed resin product, is beautiful, and hardly peels off. Thereby, it is possible to easily produce a foamed resin product such as a container having a label on which a display of fine characters, a clear display that smoothly expresses a change in gradation, a label printed by multi-color overlay printing, or the like. It works.

In the method for producing a foamed resin product according to the second aspect of the present invention, as described above, the label is brought into close contact with the pseudo male mold by winding the label around the pseudo male mold having an air hole on the side surface and sucking the label from the air hole. A first step of fixing, and after the first step, the pseudo male mold is inserted into the female mold, and pressurized air is blown out from the air hole of the pseudo male mold, and at the same time, the label and the female contacting the inner surface of the female mold cavity are formed. The second step of transferring the label to the inner surface of the cavity by temporarily reducing the pressure between the groove formed along the end of the mold and the groove formed along the end of the cavity, and temporarily fixing the label. A third step of extracting the pseudo male mold from the female mold, and after the third step, the male mold and the female mold for molding are matched and the mold is clamped. Manufacturing foam resin products and at the same time labeling foam resin It is a structure comprising a fourth step of bonding the article.

According to this, in addition to the effects described above, since the label is transferred from the pseudo male type to the female type using the pseudo male type, the label can be easily provisionally shifted without shifting to the inner surface of the cavity. Can be fixed. This produces an effect that a foamed resin product with a label can be efficiently manufactured.

As described above, the method for manufacturing a foamed resin product according to the third aspect of the present invention has a configuration in which a fan-shaped label is wound around a pseudo male type in the first step.

According to this, in addition to the above effects, when manufacturing a tubular foamed resin product such as a cup container, it is not necessary to prepare a label processed into a tubular shape in advance. Therefore, there is an effect that the manufacturing process is simplified.

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is a front view of a pseudo core. (A) shows a pseudo core having an elongated groove-shaped air hole, and (b) shows a pseudo core having a circular air hole.

FIG. 2 is a longitudinal sectional view showing a structure of a pseudo core.

FIG. 3 is a partial cross-sectional view showing a state in which a label is temporarily fixed to an inner surface of a female cavity with the pseudo core of FIG. 2;

FIG. 4 is a longitudinal sectional view showing a female mold structure.

FIG. 5 is a partially enlarged longitudinal sectional view of a female part A of FIG. 4;

FIG. 6 is a partial sectional view showing a female mold in which a label is temporarily fixed to an inner surface of a cavity.

FIG. 7 is a partial cross-sectional view showing a schematic configuration of a manufacturing apparatus of a foamed bead cup with a label.

8 is a longitudinal sectional view showing a labeled foamed bead cup manufactured by the apparatus of FIG. 7;

FIG. 9 is a front view including a partial vertical cross section showing a foamed bead cup provided with a label in the center of the side surface.

FIG. 10 is a longitudinal sectional view showing a configuration of a label.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Female type 1a Steam chamber 1d Suction port 1e Annular groove 1f Vertical groove 2 Core type (male type) 2a Steam chamber 3 Cavity part 4 Fixed board 5 Moving board 6 Ram 10 Pseudo core (pseudo male type) 10b Air hole 10c Air chamber 11 Label 11a Transparent resin layer 11b Printing layer

Continuation of front page (72) Inventor Akio Tsujita 4-1-1, Nishinakajima, Yodogawa-ku, Osaka-shi, Osaka Inside Nissin Foods Co., Ltd. (56) References JP-A-4-331132 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) B29C 44/00-44/60

Claims (3)

(57) [Claims] 1. A method of manufacturing a foamed resin product using a mold comprising a male mold and a female mold, comprising: a label in contact with an inner surface of a female mold cavity; The pressure between the grooves formed along the pressure is reduced, so that the label is temporarily fixed to the inner surface of the cavity, and then the cavity is filled with pre-expanded particles and heated and foamed to form a foamed resin product. A method for producing a foamed resin product, comprising producing a foamed resin product with a label having a label adhered thereto. 2. A method for producing a foamed resin product using a mold comprising a male mold and a female mold, comprising: wrapping a label around a pseudo male mold having an air hole on a side surface; and sucking the label from the air hole. A first step of closely attaching and fixing to the pseudo male mold; after the first step, the pseudo male mold is inserted into the female mold, and pressurized air is blown out from the air holes of the pseudo male mold while simultaneously contacting the inner surface of the female mold cavity. By reducing the pressure between the contacted label and the groove formed along the label end on the inner surface of the female cavity, the label is transferred to the inner surface of the cavity,
A second step of temporarily fixing, after the second step, a third step of extracting the pseudo male mold from the female mold, and after the third step, after the mold and the female mold are molded and clamped, And a fourth step of adhering the label to the foamed resin product at the same time as producing the foamed resin product by filling the pre-expanded particles and performing heat foam molding. 3. The method for producing a foamed resin product according to claim 2, wherein in the first step, a fan-shaped label is wound around a pseudo male mold.