JP2001206338A - Synthetic resin tray - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set a tray on a table or a truck and tableware on the tray to be hardly slid respectively and easily wash soils out even when a food is spilled and stuck to it so as not to leave adhesion traces. SOLUTION: Non-slip sheets 10 are bonded respectively on the surface and the back of a bottom plate 15b of a tray main body 15 formed into the shape of a container of shallow bottom by using a synthetic resin (including an FRP) as a raw material, and the non-slip sheets 10 are formed of a polymer composition of a polylefin component of 40 wt.% and the surface hardness of 50A-70D.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin tray, and more particularly to a synthetic resin tray suitable for use as a serving tray.

[0002]

2. Description of the Related Art A synthetic resin tray formed of a synthetic resin (including FRP) into a shallow bottom container shape is used for serving, for storing and transporting food, and for bed tables. However, because of its smoothness and hardness, there is a problem that the tableware slips and falls or the dish is spilled, especially when the tableware is placed and transported for serving. In order to prevent tableware from slipping on the tray, it was attempted to apply vinyl chloride resin or urethane resin to the surface of the bottom plate of the tray, or to bond a sheet made of these resins, but the food spilled and the bottom plate was spilled. If it adheres to the surface, even if the above-mentioned tray is washed, the attached ingredients cannot be removed cleanly, leaving color and marks on it, and it becomes dirty, especially with curry, coffee, tea, etc. The appearance was significantly worse. In particular, urethane resin films have low heat resistance, cannot be used for hospital meals in which high-temperature washing and high-temperature disinfection are repeatedly performed, have poor light resistance, and have undergone material deterioration such as discoloration due to long-term use.

[0003] Even when a non-slip sheet is provided on the surface of the bottom plate of the tray as described above, a non-slip sheet is not attached to the back surface of the bottom plate, and the surface is still smooth and hard. If the above tray is placed on a table or trolley in another vehicle and tableware is placed on it for eating or carrying, the table shakes the table and the tableware remains on the tray due to the shaking of the vehicle. And slipped off the dolly.

[0004]

The object of the present invention is to improve the quality of a non-slip sheet attached to the surface of a bottom plate of a synthetic resin tray so that tableware on the tray is less likely to slip and even if food material spills and adheres. The dirt can be easily removed by washing, so that there is no trace of adhesion, and the tray does not slide down when the tray is used on a table or a carriage in a moving vehicle. It is like that.

[0005]

SUMMARY OF THE INVENTION A synthetic resin tray according to the present invention comprises a non-slip sheet on the front and back surfaces of a bottom plate of a tray body molded into a shallow container using synthetic resin (including FRP) as a raw material. The above-mentioned non-slip sheet is made of a polymer composition having a polyolefin content of 40% by weight or more, and the polymer composition has a surface hardness of JIS hardness of 50A to 70D. However, if the surface hardness is within the above range, it is not always necessary to make the front and back the same. Further, the anti-slip sheet on the bottom plate surface is formed so as to cover almost the entire surface of the bottom plate. However, the anti-slip sheet on the back surface may be a member that covers a part of the back surface at one or more locations. .

The synthetic resin tray of the present invention is mounted on the tray because the soft non-slip sheet made of the above-mentioned polymer composition such as resin or rubber is joined to the front and back surfaces of the bottom plate, respectively. Tableware is hard to slip and hard to fall. In addition, if the tray on which meals are placed is placed on a table or trolley in a train, aircraft, or other vehicle, the tray is unlikely to slide on the table or trolley, so there is a danger that the tray will slide down even if the above-mentioned vehicle shakes. Dramatically reduced. And even if the non-slip sheet covering the front or back surface of the bottom plate is soiled with foodstuffs, since the anti-slip sheet is formed of a low-polarity polymer composition containing polyolefin, the dirt is hardly attached and attached. Dirt can be easily wiped off.

The anti-slip sheet of the present invention has a polyolefin content of 40% by weight or more, preferably 60% by weight or more, and a surface hardness of 50A to 70D, preferably 50A to 6D.
It is formed of a polymer composition of 0D resin or rubber. The above-mentioned polyolefin may be either a rubber or a resin as long as it is a homopolymer or a copolymer such as ethylene or propylene.Examples of the rubber include EPM and EPDM, and examples of the resin include polyethylene, polypropylene and polymethylpentene. You. And in the above polyolefin,
Any resin or rubber such as polyester, polyamide and styrene can be mixed within a predetermined amount or less. In addition, as for the above-mentioned arbitrary resin and rubber, when a transparent thing is desired as a non-slip sheet, a styrene resin is preferable.

[0008] However, the surface hardness (J
IS K6253) has a JIS hardness of 50 A depending on the type and the amount of the polyolefin and other resins used.
It is necessary to set to ~ 70D, preferably 60D or less, and if it is less than 50A, it becomes difficult to displace the tableware on the tray, making it inconvenient to handle, and easily scratched when touching a hard object, If it exceeds 70D, it is too hard and the effect of preventing slippage is insufficient. Further, the content of polyolefin must be set to 40% by weight or more,
If the content is less than 0% by weight, the stain resistance to foodstuffs will be insufficient, and the object of the present invention will not be achieved.

The thickness of the non-slip sheet is not particularly limited, but is preferably 0.02 to 1.0 mm, particularly preferably 0.5 mm or less. If it is less than 0.02 mm, the production becomes difficult, and on the contrary, it exceeds 1.0 mm. And not economic. The melting temperature of the polymer composition is 130 ° C. or higher, preferably 150 ° C. or higher, more preferably 170 ° C. or higher. When the melting temperature is lower than 130 ° C., the non-slip sheet is easily deformed or torn, and particularly when the joining of the non-slip sheet to the synthetic resin tray is performed simultaneously with the press molding of the synthetic resin tray as described later. , Deformation and tearing are likely to occur. The polymer composition may have no melting point.

The means for joining the above-mentioned non-slip sheet to the surface of the bottom plate of the synthetic resin tray is optional. For example, it can be joined to an existing synthetic resin tray by adhesive bonding. By mounting the anti-slip sheet at a predetermined position on the inner surface of the molding die in advance, the anti-slip sheet can be thermally bonded simultaneously with the molding of the synthetic resin tray. In this case, the manufacturing process is shortened, the manufacturing cost is reduced, and the adhesion of the non-slip sheet is improved, and the sheet is hardly peeled off, and the durability is improved.

When the synthetic resin tray to which the non-slip sheet is to be joined is made of polypropylene, the non-slip sheet and the synthetic resin tray are relatively easily bonded with an adhesive or by thermal bonding simultaneously with press-forming of the non-slip sheet. However, when the synthetic resin tray is formed of a resin other than polyolefin, for example, polyester or melamine resin, the adhesion between the non-slip sheet and the synthetic resin tray is improved. It is preferable to interpose an easily adhesive layer, for example, a polyethylene terephthalate film or paper. The easy-adhesive layer may have a single-layer structure of the above-mentioned polyethylene terephthalate film or paper or an adhesive layer alone, or may have a multilayer structure of two or more layers in which an adhesive is applied to the above-mentioned film or paper. The above-mentioned easy-adhesion material layer is also useful as a reinforcing layer when performing heat bonding simultaneously with press molding of the anti-slip sheet.

[0012] Additives such as an antioxidant, an antibacterial agent and a colorant can be added to the polymer composition constituting the above-mentioned anti-slip sheet, if necessary. Also, after forming the non-slip sheet, by performing a radiation treatment or an ultraviolet ray treatment with an electron beam or γ-ray, a cross-linking agent is added in advance, and a cross-linking treatment such as a heat treatment is performed after the non-slip sheet is formed. Thereby, the melting temperature of the anti-slip sheet can be increased.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 Polypropylene is used as a polyolefin and hydrogenated SBR (hydrogenated styrene-butadiene rubber) is used as another resin. To produce a polymer composition having a heat characteristic of not melting and having a surface hardness of 50A to 70D. A sheet having a thickness of 0.2 to 0.5 mm is formed using the obtained polymer composition, and the sheet is cut into a desired size to obtain a non-slip sheet 10 (see FIG. 1). In FIG. 1, reference numeral 15 denotes a serving synthetic resin tray body injection-molded with polypropylene, which comprises an edge 15a and a bottom plate 15b.
The above-mentioned non-slip sheet 10 is bonded to the front and back surfaces of 5b by thermal bonding at the time of the above-mentioned injection molding, respectively. The non-slip sheet 10 is fixed to the inner surface of the mold in advance with a double-sided tape.

Embodiment 2 In FIG. 2, reference numeral 10 denotes a non-slip sheet similar to that of the first embodiment. A polyethylene terephthalate film is adhered to the entire back surface of the anti-slip sheet 10 via an adhesive polyolefin layer. The polyolefin layer and the polyethylene terephthalate film form the easy-adhesion layer 11 having a two-layer structure. The anti-slip sheet 10 is thermally bonded to both the front and back surfaces of the bottom plate 16b of the serving synthetic resin tray body 16 made of polyester resin FRP via the easily adhesive layer 11. In addition, 16a is an edge of the tray main body 16.

FIG. 5 shows an example of an apparatus for press-forming the synthetic resin tray main body 16 of the second embodiment, which is configured so that the tray main body 16 is formed with the bottom thereof facing upward.
That is, the lower mold 21 has an annular groove 21a around the periphery corresponding to the edge 16a of the tray main body 16, and this annular groove 21
A flat convex portion 21b at the top corresponding to the inner shape of the tray main body 16 is provided inside a. On the other hand, upper mold 2
2 has an edge 22a that enters the annular groove 21a, and a dish-shaped recess 22b corresponding to the outer shape of the tray body 16 is provided inside the edge 22a.

In the apparatus shown in FIG. 5, the lower mold 21 and the upper mold 22 are opened and the projections 2 of the lower mold 21 are opened.
Non-slip sheet with easy-adhesive layer on 1b (laminated body of anti-slip sheet 10 and easy-adhesive layer 11 having two-layer structure) 1
0A, FRP molding material (SMC) 17 and non-slip sheet 10A with an easy-adhesion layer similar to the above, so that the upper and lower easy-adhesion layers of anti-slip sheet 10A with an easy-adhesion layer are in contact with molding material 17. The lower mold 21 and the upper mold 22 are closed, and the molding material 17 is heated and the tray body 16 is closed.
And press-forming at the same time.
Non-slip sheet 10A with easy-adhesive layer on both sides of 6b
Heat bonding. The lower die 21 and the upper die 22 may be arranged upside down.

Third Embodiment In FIG. 3, reference numeral 10 denotes a non-slip sheet similar to that of the first embodiment, and reference numeral 18 denotes a polypropylene synthetic resin tray main body. The tray main body 18 has an edge 18a and a bottom plate 18b. However, in the third embodiment, as shown in FIG. 4, the anti-slip sheet 10 on the back surface is formed in a disk shape, and is fixed to four places on the back surface of the bottom plate 18 b of the tray main body 18.

Embodiment 4 In FIGS. 3 and 4, the tray main body 18 is formed by FRP made of the polyester resin of the second embodiment, and the anti-slipping sheet 10 is heated to the tray main body 18 via the adhesive layer 11. Glue. That is, the non-slip sheet 10A with the easy-adhesion material layer is thermally bonded. In this case, FIG.
In the dish-shaped recess 22b of the upper mold 22, a hole for fitting the anti-slip sheet 10A with the easy-adhesive material layer is formed to be shallower than the thickness of the sheet 10A, and the sheet 10A is fitted and fixed in the hole. be able to. FIG.
The upper and lower dies 21 and 22 may be arranged upside down, and the fitting hole may be provided in the dish-shaped recess 22b.

[0019]

EXAMPLE Polypropylene ("Grand Polypro F109D" manufactured by Grand Polymer Co., Ltd.) was used as a polyolefin for an anti-slip sheet, and hydrogenated SBR (JS) was used as another resin.
R Dynalon 1320P) and EVA (Mitsui DuPont Polychemical Co., Ltd. “Evaflex P280”)
7 ") and a polyethylene terephthalate film (" Cosmoshine A4 "manufactured by Toyobo Co., Ltd.) for the adhesive layer.
300 "), an adhesive polyolefin (Admer SE80 manufactured by Mitsui Chemicals, Inc.)
0 ")" were prepared, and non-slip sheets of Examples 1 and 2 and Comparative Examples 1 to 3 were trial-produced, and were bonded to the front and back surfaces of the FRP serving tray body by thermal bonding during molding.

Example 1 The above polypropylene and hydrogenated SBR were mixed at a weight ratio of 40 /
The mixture was fed to a T-die extruder together with an adhesive polyolefin and a 100 μm-thick polyethylene terephthalate film to form an adhesive polyolefin (thickness 30 μm) and a polymer composition on the polyethylene terephthalate film. Object (thickness 200μ)
m) are sequentially extruded and laminated, and the laminated body is cut into a predetermined size, and the anti-slip sheet 10A with the easy-adhesive layer is provided.
(See FIG. 5).

The anti-slip sheet 10A with the easy-adhesive layer is placed on the convex portion 21b of the lower mold 21 shown in FIG. 5 so that the easy-adhesive layer faces upward, and unsaturated polyester and glass fiber are placed thereon. The FRP molding material (SMC) 17 is placed, and the anti-slip sheet with an easy-adhesive layer 10A is further placed thereon such that the easy-adhesive layer faces down. 21 was closed and press-formed at 150 ° C. for 90 seconds to form a synthetic resin tray body 16 for serving made of FRP, and at the same time, a non-slip sheet 10A with an easy-adhesive material layer was thermally bonded to both the front and back surfaces of the bottom plate 16b. .
That is, the non-slip sheet 10 was thermally bonded to both the front and back surfaces of the bottom plate 16b via the easily adhesive layer 11.

Example 2 and Comparative Examples 1 to 3 The composition and film thickness of Example 1 were variously changed as shown in Table 1 below, and the other conditions were the same as in Example 1 except that Example 2 and Comparative Example 1 were used. -3 synthetic resin trays with non-slip sheets were prototyped. However, in Comparative Example 2, the conditions for press molding were set to 130 ° C. × 240 seconds. In the table, “Example” is abbreviated as “real” and “Comparative Example” is abbreviated as “ratio”.

Table 1

In addition to the above Comparative Examples 1 to 3, the FRP tray of Comparative Example 4 using a urethane coat layer as an anti-slip sheet and the FRP tray of Comparative Example 5 having no anti-slip sheet were prepared. Other properties were tested as follows. Table 2 shows the results.

Surface hardness Press sheet of the same composition as the non-slip sheet (1 mm thick)
Were laminated and measured according to JIS K6253.

The angle at which the tableware starts to slide. A mug A (made of melamine resin, outer diameter of thread end 48 mm, inner diameter 44 mm) and a mug B (made of pottery, outer diameter 72 mm, inner diameter 66 mm) of the tableware are placed on the tray. Tilt,
The inclination angle when the mug started to slide was measured.

Tray Sliding Angle An empty tray was placed on a table having a smooth surface made of a hard PVC material and a stainless steel material, and the table was tilted. The tilt angle when the tray started to slide was measured.

Food contamination test Various foods (coffee, green tea, sauce, soy sauce, curry) are applied on a tray, washed by standing at 50 ° C. for 24 hours, the degree of stain is visually determined, and no coloring is evaluated. , A little trace of coloring was marked as Δ, and a marked trace of coloring was marked as ×.

Durability The tray is washed with hot water of 80 ° C. for 30 minutes, and then
The operation of drying at 30 ° C. for 30 minutes was repeated 10 times, and the presence or absence of peeling was inspected.

Table 2

As described above, in Examples 1 and 2, the tableware sliding angle and the tray sliding angle were both 30 ° or more, and the anti-slip effect was recognized as compared with Comparative Example 5 having no anti-slip sheet. It ’s bigger than 20 degrees,
In addition, the stain resistance was good and the durability was excellent. On the other hand, Comparative Examples 1 and 2 both have poor polypropylene resistance because both have insufficient polypropylene content, and Comparative Example 3 has a non-slip sheet made of only polypropylene,
Although excellent in stain resistance, the surface hardness becomes excessively large, so that the tableware sliding angle becomes about the same as that of Comparative Example 5 having no anti-slip sheet, and Comparative Example 4 uses a urethane coat layer as the anti-slip sheet. And the stain resistance was poor.

Next, a 70-denier polyester fiber yarn is used as a warp and a weft, and the warp density and the weft density are each integrally formed with a single layer urethane resin impregnated cloth having a base fabric of 95 / inch plain cloth. The obtained tray of Comparative Example 6 was prepared, and the heat-resistant test (immersion in water, boiling 1) for the FRP tray of Comparative Example 6 and Example 1, and the FRP tray of Comparative Example 4 using the urethane coat layer as a non-slip sheet was performed. After 1 hour, the operation of removing at room temperature for 30 minutes and then drying in an air dryer at 110 ° C. for 1 hour was repeated 20 times). In Example 1, there was no change in appearance. In Comparative Example 4, partial peeling of the urethane coat layer was observed, and in Comparative Example 6, the film surface was partially peeled, the surface was rough, and the entire surface was yellowed.

The light resistance of Example 1, Comparative Example 4 and Comparative Example 6 was compared. 3 for testing machine
Using a lightfastness tester equipped with a 00W discharge tube, the distance to the test piece was set to 7 cm, and the presence or absence of discoloration after irradiation for 4 hours was visually compared. As a result, no discoloration was observed in Example 1 and Comparative Example 4, but significant discoloration was observed in Comparative Example 6.

[0034]

As described above, the synthetic resin tray of the present invention does not fall even if the tray is slightly tilted because the tableware placed thereon is hard to slide, and the table or cart on which the tray is mounted is tilted. However, the tray does not fall. In addition, even if the food spills from the tableware and adheres to it, and if it is left for a long time, or if the contaminated hot water in the pre-washing tank soaked to soften the adhered food residue and make it easy to fall off, these stains will not occur. Can be easily removed by the main cleaning, and no trace of adhesion remains, which is excellent as a tray for serving.

In particular, in the synthetic resin tray according to the second aspect, the melting point of the polymer composition constituting the anti-slip sheet is 1
Since the temperature is set to 30 ° C. or higher, the non-slip sheet is less likely to be deformed or torn, and it is easy to thermally bond the non-slip sheet when press-forming the above tray, and the non-slip sheet is synthesized. Since the manufacturing process of the resin tray is shortened and the heat resistance is excellent, it can withstand the hot water and the temperature in the disinfecting storage. Further, in the synthetic resin tray according to the third aspect, the anti-slip sheet is hardly peeled off, and the durability is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment.

FIG. 2 is a sectional view of a second embodiment.

FIG. 3 is a sectional view of a third embodiment.

FIG. 4 is a bottom view of the third embodiment.

FIG. 5 is a sectional view of a press device used for manufacturing.

[Explanation of symbols]

 10: Non-slip sheet 10A: Non-slip sheet with easy-adhesive layer 11: Easy-adhesive layer 15, 16, 18: Tray body 15a, 16a, 18a: Edge 15b, 16b, 18b: Bottom plate 17: FRP Molding material 21: Lower mold 21a: Annular groove 21b: Convex part 22: Upper mold 22a: Edge part 22b: Dish-shaped concave part

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 000219015 Shima Trading Co., Ltd. 3-1-1-18 Kitahama, Chuo-ku, Osaka-shi, Osaka (72) Inventor Hiroyuki Tsuchida 255 Kannonji-cho, Tsu-shi, Mie Prefecture Kurehaera Stomer Co., Ltd. In-plant (72) Inventor Shigeo Kobayashi 255, Kanonji-cho, Tsu-shi, Mie Prefecture Kurehaera Stomer Co., Ltd. Inventor Atsushi Jinno 255 Kannonji-cho, Tsu-shi, Mie Pref. JA07 JA08 JB04 JC07

Claims (3)

[Claims] 1. A non-slip sheet is bonded to a front surface and a back surface of a bottom plate of a tray body molded into a shallow container using synthetic resin (including FRP) as a raw material.
The above non-slip sheet has a polyolefin content of 40% by weight
A synthetic resin tray comprising the above polymer composition, wherein the surface hardness of the polymer composition is 50A to 70D of JIS hardness. 2. The temperature at which the polymer composition melts is 130 ° C.
The synthetic resin tray according to claim 1, which is as described above. 3. The synthetic resin tray according to claim 1, wherein an easy-adhesive layer for improving the adhesive strength between the bottom plate surface and the bottom plate back surface of the tray body and the anti-slip sheet is interposed. .