TWI868749B - Method for manufacturing a decal container - Google Patents

Abstract

A method for manufacturing a decal container includes subjecting a first decal paper to a vacuum forming process to obtain a first molding portion having the outline of a container body, and then cutting out the first molding portion to obtain a first decal paper blank having a pattern. The first decal paper blank is then moved into a mold of an injection molding machine, and hot melt plastic is injected into the mold, so that the hot melt plastic is solidified and connected to the surface of the first decal paper blank having the pattern, thereby manufacturing the decal container. Through the above manufacturing method design, the pattern of the manufactured decal container can be protected by a layer of transparent plastic film, so that the pattern will not be damaged by friction, nor will it be discolored or oxidized by contact with food or air, so that the color brightness of the pattern can be maintained for a longer time.

Description

Method for manufacturing a decal container

The present invention relates to a method for manufacturing a hot-melt plastic container, in particular to a method for manufacturing a hot-melt plastic container with a sticker.

At present, when manufacturing plastic containers with patterns on the surface, the pattern is usually transferred to the surface of a container blank through transfer technology, such as through hot press transfer technology. Although the manufacturing method is simple, because the pattern is directly exposed on the surface of the container, the pattern will directly contact the food, which will cause food safety concerns. In addition, the pattern is also easy to wear and tear. Once the wear and tear occurs, it will significantly affect the texture of the entire container.

Therefore, the object of the present invention is to provide a method for manufacturing a decal container that can improve at least one disadvantage of the prior art.

Therefore, the manufacturing method of the decal container of the present invention comprises a container body and a first decal paper layer connected to the surface of the container body. The manufacturing method comprises a first decal paper blank preparation step, a decal paper blank setting step, and an injection molding step.

The first flower paper blank preparation step includes a first flower paper pre-molding sub-step and a first flower paper blank cutting sub-step. In the first flower paper pre-molding sub-step, a vacuum forming device having a first model corresponding to the container body performs thermoplastic processing on a first flower paper made of thermoplastic material to obtain a first pre-molded flower paper blank having a first molding portion with the outline of the container body, and one surface of the first flower paper is provided with a pattern. In the first flower paper blank cutting sub-step, a cutting device is used to cut and remove the first molding portion of the first pre-molded flower paper blank to obtain a first flower paper blank having the pattern.

In the step of setting the flower paper blank, the first flower paper blank is moved into a mold of an injection molding machine for injection molding the container body.

In the injection molding step, the injection molding machine injects hot melt plastic into the mold, so that the hot melt plastic solidifies and forms a structure connected to the surface of the first decal paper blank having the pattern and covers the container body having the pattern, thereby manufacturing the decal container.

The effect of the present invention is that through the design of the first decal paper blank preparation step, the decal paper blank setting step and the injection molding step, the pattern of the manufactured decal container can be protected by a layer of transparent plastic film, so the pattern will not be damaged by friction, and will not be discolored or oxidized by contact with food or air, so that the color brightness of the pattern can be maintained for a longer time.

Before the present invention is described in detail, it should be noted that similar components are represented by the same reference numerals in the following description.

Referring to FIGS. 1 and 2 , a first embodiment of the manufacturing method of the decal container 3 of the present invention is applicable to a decal container 3 made of a plastic material having a pattern by injection molding. The decal container 3 includes a container body 31 made of a plastic material by injection molding, and a first decal paper layer 32 and a second decal paper layer 33 respectively attached to the inner surface and the outer surface of the container body 31. The first decal paper layer 32 has a pattern portion 320 facing the inner surface of the container body 31, and the second decal paper layer 33 has a pattern portion 330 facing the outer surface of the container body 31.

The manufacturing method comprises the following steps: a decal preparation step 910, a first decal blank product preparation step 920, a second decal blank product preparation step 930, a decal blank product setting step 940, and an injection molding step 950.

In the decal preparation step 910, a printer (not shown) is used to print a first pattern 40 (shown in FIG. 3) and a second pattern 50 (shown in FIG. 5) on one surface of two transparent sheets of thermoplastic films, respectively, to produce a first decal 4 (shown in FIG. 3) and a second decal 5 (shown in FIG. 5). The first decal 4 and the second decal 5 will be used to make the first decal layer 32 and the second decal layer 33 of the decal container 3. The first pattern 40 and the second pattern 50 of the first decal 4 and the second decal 5 may be the same or different. The thermoplastic film is, for example, but not limited to, food-grade transparent PET (polyethylene terephthalate), or a transparent OPP film (Oriented Polypropylene). Since there are many types of printers that can print the first pattern 40 and the second pattern 50 on the thermoplastic film, and it is not the focus of the present invention, it will not be described in detail.

1 , 3 , and 4 , the first flower paper blank preparation step 920 includes a first flower paper pre-molding sub-step 921 , and a first flower paper blank cutting sub-step 922 .

In the first decal pre-molding sub-step 921, a blister molding device 6 is used to pre-mold the first decal 4 used to make the first decal layer 32. The blister molding device 6 is provided with a first mold 61 having the same inner surface contour as the container body 31. During the pre-molding process, the first decal 4 is installed on the blister molding device 6 with the side with the first pattern 40 printed on it facing away from the first mold 61, so that the first pattern 40 is located above the first mold 61. Then, the blister molding device 6 is used to perform a thermoplastic processing on the first decal 4 through the first mold 61 to obtain a first pre-molded decal embryo 41 having a first molding portion 411 having the inner surface contour of the container body 31, and the outer convex surface of the first molding portion 411 has the first pattern 40. Since the heat molding of the rubber film by the blister molding device 6 is a prior art and there are many ways, it will not be described in detail.

In the first flower paper blank cutting sub-step 922, a cutting device 7 is used to cut the first pre-molded flower paper blank 41. The cutting device 7 has a first die holder 71 for placing and positioning the first pre-molded flower paper blank 41, and a first punching die 72 for cutting the first pre-molded flower paper blank 41 disposed on the first die holder 71. In this step, the first punching die 72 is used to punch and cut the first pre-molded flower paper blank 41 along the periphery of the first molding portion 411 to obtain a first flower paper blank 42 corresponding to the inner surface contour of the container body 31 and having the first pattern 40, and the outer convex surface of the first flower paper blank 42 has the first pattern 40.

1 , 5 , and 6 , the second flower paper blank product preparation step 930 includes a second flower paper pre-molding sub-step 931 , and a second flower paper blank product cutting sub-step 932 .

In the second decal paper pre-molding sub-step 931, the blister molding device 6 will perform pre-molding processing on the second decal paper 5 used to make the second decal paper layer 33. The blister molding device 6 will be changed to set a second mold 62 with the same outer surface contour as the container body 31. During the pre-molding processing, the second decal paper 5 is installed on the blister molding device 6 with the side printed with the second pattern 50 facing the second mold 62, so that the second pattern 50 is located above the second mold 62. Then, the blister molding device 6 performs a thermoplastic processing on the second decal paper 5 through the second mold 62 to obtain a second pre-molded decal paper embryo 51 having a second molding portion 511 with the outer surface contour of the container body 31, and the concave surface of the second molding portion 511 has the second pattern 50.

In the second flower paper blank cutting sub-step 932, the cutting device 7 is used to cut the second pre-molded flower paper blank 51. The cutting device 7 has a second die base 73 for placing and positioning the second pre-molded flower paper blank 51, and a second punching die 74 for cutting the second pre-molded flower paper blank 51 disposed on the second die base 73. In this step, the second punching die 74 is used to punch and cut the second pre-molded flower paper blank 51 along the periphery of the second molding portion 511 to obtain a second flower paper blank 52 corresponding to the outer surface contour of the container body 31 and having the second pattern 50, and the concave surface of the second flower paper blank 52 has the second pattern 50.

Referring to FIGS. 1 and 7 , in the decal blank setting step 940 , the first decal blank 42 and the second decal blank 52 are moved into an injection molding machine. The injection molding machine has a mold 8 for injection molding the container body 31 . The mold 8 has a male mold 81 and a female mold 82 . In this step, the first decal blank 42 is placed in the male mold 81 , and the second decal blank 52 is placed in the female mold 82 .

In the injection molding step 950, the male mold 81 is joined with the female mold 82 to define a molding space 80 between the first decal blank 42 and the second decal blank 52. At this time, the outer surface of the first decal blank 42 having the first pattern 40 and the outer surface of the second decal blank 52 having the second pattern 50 are spaced and facing each other. Then, the injection molding machine is made to inject hot melt adhesive 800 into the molding space 80 of the mold 8, so that the hot melt adhesive 800 is connected to the outer surface of the first decal blank 42 provided with the first pattern 40 and covers the first pattern 40, and the hot melt adhesive 800 is connected to the inner surface of the second decal blank 5 provided with the second pattern 50 and covers the second pattern 50.

The hot melt adhesive 800 in the mold 8 will solidify to form the container body 31, the first decal paper blank 42 will form the first decal paper layer 32 connected and fixed to the inner surface of the container body 31, and the second decal paper blank 52 will form the second decal paper layer 33 connected and fixed to the outer surface of the container body 31. Finally, the male mold 81 and the female mold 82 of the mold 8 are opened to take out the finished decal container 3.

In the first embodiment, the first pattern 61 and the second pattern 62 on the blister forming device 6 are replaced to respectively perform the first pattern paper pre-molding sub-step 921 and the second pattern paper pre-molding sub-step 931, and the first pattern paper blank cutting sub-step 922 and the second pattern paper blank cutting sub-step 932 are respectively performed by replacing the first mold base 71 and the first punching knife mold 72 on the cutting device 7, and replacing the second mold base 73 and the second punching knife mold 74. However, in practice, in another embodiment of the present invention, when executing the first flower paper blank preparation step 920 and the second flower paper blank preparation step 930, the dedicated blister forming device 6 and the cutting device 7 can be used respectively to improve production efficiency.

3, 4, 8, and 9, a second embodiment of the manufacturing method of the decal container 3 of the present invention is different from the first embodiment in that the manufacturing method is used to manufacture a decal container 3 with a single-sided decal. For the convenience of description, only the differences between the embodiments will be described below.

In the second embodiment, the manufacturing method only includes the decal preparation step 910, the first decal blank preparation step 920, the decal blank product setting step 940, and the injection molding step 950. The first decal 4 is prepared through the decal preparation step 910, and the first decal blank product 42 is made from the first decal 4 through the first decal blank product preparation step 920. In the decal blank product setting step 940, the first decal blank product 42 is placed in the female mold 82 or the male mold 81 of the mold 8 (shown in FIG. 7 ). In the injection molding step 950, the hot melt adhesive 800 injected into the mold 8 is connected to the first decal blank product 42, so as to manufacture the decal container 3 in the form of a single-sided decal.

In practice, the type of the first model 61 provided in the blister molding device 6 can be modified accordingly according to the pattern setting position of the decal container 3. When the pattern is to be provided on the inner surface of the container body 31, the first model 61 can be designed to correspond to the inner surface contour of the container body 31, and the first decal paper 4 is thermoplasticized in such a way that the surface provided with the first pattern 40 faces away from the first model 61, and the first decal paper blank 42 to be subsequently manufactured is placed in the male mold 81 of the mold 8, so as to perform the injection molding step 950, and the decal container 3 having the pattern only on the inner surface can be manufactured.

On the contrary, when the pattern is to be provided on the outer surface of the container body 31, the first model 61 is designed to correspond to the outer surface contour of the container body 31, and the first decal 4 is thermoplasticized in a manner such that one side provided with the first pattern 40 faces the first model 61, and the first decal blank 42 to be manufactured is placed in the mother mold 82 of the mold 8 to perform the injection molding step 950, thereby manufacturing the decal container 3 having the pattern only on the outer surface.

In the above-mentioned embodiments, the first flower paper 4 and the second flower paper 5 can be transferred and placed into the vacuum forming device 6, the first pre-molded flower paper embryo 41 and the second pre-molded flower paper embryo 51 can be moved out of the thermoforming device, the first pre-molded flower paper embryo 41 and the second pre-molded flower paper embryo 51 can be moved into the cutting device 7, the first flower paper embryo product 42 and the second flower paper embryo product 52 can be moved out of the cutting device 7, and the first flower paper embryo product 42 and the second flower paper embryo product 52 can be respectively placed into the male mold 81 and the female mold 82 of the mold 8, so as to perform automatic or semi-automatic rapid production. Since there are many types of the above-mentioned robot arms and transfer equipment, and they are not the focus of the present invention, they will not be described in detail.

In summary, through the design of the first decal preparation step 920, the decal setting step 940 and the injection molding step 950, the pattern of the manufactured decal container 3 can be protected by a layer of transparent plastic film, so the pattern will not be damaged by friction with food, nor will it be scratched and removed by a cleaning brush, and the pattern will not be discolored or oxidized by contact with food or air, so that the color brightness of the pattern can be maintained for a longer time, thereby greatly improving the texture and durability of the decal container 3. And through the design of the second decal preparation step 930, the decal container 3 with double-sided decals can be manufactured through the decal setting step 940 and the injection molding step 950. Therefore, the manufacturing method of the decal container 3 of the present invention is indeed a very innovative creation, and can indeed achieve the purpose of the present invention.

However, the above is only an embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. All simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still within the scope of the present patent.

3: Decal container 31: Container body 32: First decal layer 320: Pattern section 33: Second decal layer 330: Pattern section 4: First decal 40: First pattern 41: First pre-molded decal embryo 411: First molding section 42: First decal embryo product 5: Second decal 50: Second pattern 51: Second pre-molded decal embryo 511: Second molding section 52: Second decal embryo product 6: Vacuum forming device 61: First model 62: Second model 7: Cutting device 71: First die base 72: First stamping die 73: Second die base 74: Second stamping die 8: Mold 80: Molding space 800: Hot melt adhesive 81: Male mold 82: Female mold 910: Decorative paper preparation step 920: First decorative paper blank preparation step 921: First decorative paper pre-molding sub-step 922: First decorative paper blank cutting sub-step 930: Second decorative paper blank preparation step 931: Second decorative paper pre-molding sub-step 932: Second decorative paper blank cutting sub-step 940: Decorative paper blank setting step 950: Injection molding step

Other features and effects of the present invention will be clearly presented in the implementation method with reference to the drawings, in which: Figure 1 is a step flow chart illustrating a first embodiment of the manufacturing method of the decal container of the present invention; Figure 2 is a side sectional view schematically illustrating the structure of a decal container made by the first embodiment; Figure 3 is a processing schematic diagram illustrating the processing process of a first flower paper pre-molding sub-step of the first embodiment; Figure 4 is a processing schematic diagram illustrating the processing process of a first flower paper blank cutting sub-step of the first embodiment; Figure 5 is a processing schematic diagram illustrating the processing process of a second flower paper pre-molding sub-step of the first embodiment; Figure 6 is a processing schematic diagram illustrating the processing process of a second flower paper blank cutting sub-step of the first embodiment; FIG. 7 is a processing schematic diagram illustrating a processing process of a decal blank product setting step and an injection molding step of the first embodiment; FIG. 8 is a step flow chart illustrating a second embodiment of the manufacturing method of the decal container of the present invention; and FIG. 9 is a side sectional view schematically illustrating the structure of a decal container manufactured by the second embodiment.

910: Decorative paper preparation step 920: First decorative paper blank preparation step 921: First decorative paper pre-molding sub-step 922: First decorative paper blank cutting sub-step 930: Second decorative paper blank preparation step 931: Second decorative paper pre-molding sub-step 932: Second decorative paper blank cutting sub-step 940: Decorative paper blank setting step 950: Injection molding step

Claims (2)

A method for manufacturing a decal container, wherein the decal container has a container body and a first decal paper layer connected to the surface of the container body, comprising the following steps: a first decal paper blank preparation step, including a first decal paper pre-molding sub-step and a first decal paper blank cutting sub-step, in which a first decal paper pre-molding device having a first mold corresponding to the inner surface contour of the container body is used to perform thermoplastic processing on a first decal paper made of a thermoplastic material to obtain a first pre-molded portion having the inner surface contour of the container body. The first flower paper embryo, the surface of the first flower paper provided with the first pattern faces away from the first mold, in the first flower paper embryo cutting sub-step, a cutting device cuts out the first molding part of the first pre-molded flower paper embryo to obtain a first flower paper embryo with the first pattern; the second flower paper embryo preparation step includes a second flower paper pre-molding sub-step and a second flower paper embryo cutting sub-step, in the second flower paper pre-molding sub-step, a second flower paper made of thermoplastic material with a second pattern on one surface is placed in a blister molding device, the blister molding device has a A second mold corresponding to the outer surface contour of the container body is used, so that the surface of the second flower paper having the second pattern faces the second mold, and the second mold is used to perform thermoplastic processing on the second flower paper with the second mold to obtain a second pre-molded flower paper embryo with a second molding portion of the outer surface contour of the container body. In the second flower paper embryo product cutting sub-step, the cutting device is used to cut and remove the second molding portion of the second pre-molded flower paper embryo to obtain a second flower paper embryo product with the second pattern; the flower paper embryo product setting step is used to place the first flower paper The first decal paper product and the second decal paper product are moved into a mold of an injection molding machine for injection molding the container body, the mold having a male mold and a female mold that are clamped together, the first decal paper product is set and positioned in the male mold, and the second decal paper product is set and positioned in the female mold; and an injection molding step is performed, so that the injection molding machine injects hot melt plastic into the mold, and the hot melt plastic is solidified to form the container body, and the container body is connected between the facing surfaces of the first decal paper product having the first pattern and the second decal paper product having the second pattern, so as to produce the decal container. The manufacturing method of the decal container as described in claim 1 further comprises a decal paper preparation step, wherein a printer prints the first pattern and the second pattern on one surface of two thermoplastic films respectively to produce the first decal paper and the second decal paper respectively.

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