TW202246137A - Paper container and method for manufacturing paper container - Google Patents

Abstract

A method for manufacturing a paper container is provided, including following steps of: preparing a paper; covering a surface of the paper with a first film layer to form a substrate; cutting the substrate to form a main body; partially removing one end of the main body along a thickness direction to form a recessed portion and a thin portion, the recessed portion and the first film layer being located at two opposite sides of the main body; applying an adhesive to the thin portion and folding the thin portion toward the recessed portion to form a folded edge; and bending the main body and connecting an exposed portion of the folded edge with an attaching portion of the main body to form the paper container; wherein the first film layer faces an interior of the paper container. A paper container is further provided, including: a main body, defining an inner space, an end of the main body having a thin portion extending therefrom, the thin portion folded away from the inner space to form a folded edge.

Description

Paper container and its manufacturing method

The present invention relates to containers, in particular to a paper container and its manufacturing method.

Conventional paper containers, such as paper cups, are made by rolling a piece of paper into a cylindrical shape and then stacking and bonding the opposite ends of the paper. The inner and outer surfaces are respectively coated with a coating layer to increase the structural strength. In detail, the inner coating layer of the paper cup needs to be in contact with food, so it should have better heat resistance and acid and alkali resistance to avoid decomposition and release toxins; the outer coating layer of the paper cup only needs to provide appropriate waterproof , Anti-wear effect, so the outer coating layer is usually made of cheaper materials to save manufacturing costs.

However, since the materials of the inner film layer and the outer film layer are different, the adhesive strength after heating is not good, and even cannot be bonded, so an adhesive is needed to bond each other, and the thickness of the joint is increased to make it beautiful There are disadvantages such as poor performance, complicated manufacturing process and increased production cost. In addition, since the cut edge of the paper is not covered by the film layer, it is easy to contact with the liquid in the paper container, and then absorbs water to soften it, so that the joint cannot be tightly connected and there is a possibility of liquid leakage.

Therefore, it is necessary to provide a novel and progressive paper container and its manufacturing method to solve the above-mentioned problems.

The main purpose of the present invention is to provide a paper container and its manufacturing method, which can effectively prevent liquid leakage and have good aesthetics.

In order to achieve the above object, the present invention provides a method for making a paper container, comprising the following steps: preparing a paper material; coating a first film layer on one surface of the paper material to form a substrate; cutting the substrate to form A body; one end of the body is partially removed along a thickness direction to form a notch and a thin plate portion, the notch and the first film layer are located on opposite sides of the body; an adhesive material is coated on The thin plate portion is folded toward the notch to connect the thin plate portion to form a hem; and the body is bent and the hem is connected to a joint portion of the body to form the paper container, wherein the first film layer face into the paper container.

In order to achieve the above object, the present invention provides a paper container, comprising: a body, enclosing an inner space, including a paper material and a first film layer covering one surface of the paper material, one end of the body extends There is a thin plate portion, and the thin plate portion is folded to form a folded edge with the paper material relatively facing away from the inner space, the folded edge includes a first section and a second section overlapping in the thickness direction, the first There is an adhesive material between the segment and the second segment.

The following examples illustrate possible implementations of the present invention, but are not intended to limit the scope of protection of the present invention.

Please refer to Figures 1 to 7, which show a preferred embodiment of the present invention, the method for making the paper container of the present invention comprises the following steps: Step S1: prepare a paper material 10; Step S2: apply a first film layer 20 on One surface of the paper material 10 forms a base material 100; step S3: cutting the base material 100 to form a body 1, as shown in Figure 2, the base material 100 can cut out a plurality of the body 1; step S4 : Partially remove one end of the main body 1 along a thickness direction to form a recessed portion 30 and a thin plate portion 40, the recessed portion 30 and the first film layer 20 are located on two opposite sides of the main body 1; step S5 : apply an adhesive material 70 on the thin plate portion 40 and fold and connect the thin plate portion 40 toward the notch portion 30 to form a folded edge 41; and step S6: bend the body 1 and connect the folded edge 41 to the body 1 to form the paper container, wherein the first film layer 20 faces into the paper container. Through the above steps, the folded edge 41 can prevent the paper material 10 from contacting with the liquid in the paper container, effectively preventing leakage, and the notch 30 can avoid the thickness of the joint between the folded edge 41 and the joint portion 50 Oversized for aesthetics.

In the step S2, it is preferable to further coat a second film layer 60 on the surface of the paper 10 opposite to the first film layer 20, wherein the materials of the first film layer 20 and the second film layer 60 different. In detail, the material of the first film layer 20 is selected from at least one of polypropylene (Polypropylene, PP) and polyethylene terephthalate (Polyethylene terephthalate, PET), which can provide a good waterproof effect and maintain the The paper material 10 is flexible, heat-resistant and chemically stable; the second film layer 60 can be, for example, polyethylene (PE), which has good transparency, easy processing and low cost, and can increase the wear resistance of the paper container degree and avoid softening of the paper material 10.

In the step S4 , the depth of the notch 30 is greater than the thickness of the second film layer 60 , that is, at least part of the paper 10 is removed, so as to effectively reduce the thickness of the thin plate portion 40 . Preferably, the thickness of the thin plate part 40 is not greater than 2/3 of the thickness of the base material 100; The thickness of the connected parts 50 is too large, and the appearance is good.

Preferably, before the step S5 , a folding line 42 is press-set on the thin plate portion 40 to facilitate bending the thin plate portion 40 . In the step S5, the folded and connected part of the thin plate part 40 is the paper material 10, which can be stably fixed by the adhesive material 70; 31, one end surface of the thin plate portion 40 is abutted against the cut surface 31, as shown in FIG. 4 , which can prevent the paper material 10 from being exposed and has a good anti-leakage effect.

In this embodiment, the paper container is a paper cup, the body 1 is a cup body of the paper cup and includes a first end 80 and a second end 90 opposite to each other, the folded edge 41 is located at the first end 80, the The joint part 50 is located at the second end 90. In the step S6, the first end 80 and the second end 90 are approached to each other and the body 1 is rolled into a cylindrical shape, as shown in FIG. 5 and FIG. 6, the structure Simple. With reference to FIG. 7 , the exposed part of the folded edge 41 and the joint part 50 are both the first film layer 20 , which can be welded by heating without using additional adhesives. The material is the same and can provide better joint strength, which is convenient Processing and cost saving. In other embodiments, the paper container can also be, for example, a bento box, a paper box, a paper bag, and the like.

The present invention further provides a paper container, comprising: the main body 1 enclosing an inner space C, including the paper material 10 and the first film layer 20 covering one surface of the paper material 10, one end of the main body 1 The thin plate portion 40 is extended, and the thin plate portion 40 is folded to form the folded edge 41 with the paper material 10 relatively facing away from the inner space C. The thickness of the folded edge 41 is not greater than 1.5 of the thickness of the main body 1 times. In this embodiment, the paper container is manufactured using the above-mentioned method; the folded edge 41 includes a first section 411 and a second section 412 overlapping in the thickness direction, and the first section 411 and the second section The adhesive material 70 is provided between the sections 412, and the bonding strength is good. One end surface of the first section 411 abuts against the paper material 10 along the length extending direction of the main body 1 , which is easy to process and prevents the paper material 10 from being exposed, and has a good anti-leakage effect.

1: Ontology 10: Paper material 20: The first film layer 30: Notch 31: Section 40: Thin plate department 41: Hem 411: first paragraph 412: second paragraph 42: Polyline 50: Joint 60: Second film layer 70: Glue 80: first end 90: second end 100: Substrate C: inner space S1~S6: steps

Fig. 1 is a flowchart of the steps of a preferred embodiment of the present invention. Fig. 2 is a schematic diagram of cutting to form a body in a preferred embodiment of the present invention. Fig. 3 is a schematic view of the main body forming a thin plate part according to a preferred embodiment of the present invention. Fig. 4 is a schematic view of the main body forming a folded edge in a preferred embodiment of the present invention. Fig. 5 is a perspective view of the body forming the folded edge in a preferred embodiment of the present invention. Fig. 6 is a perspective view of a preferred embodiment of the present invention. Fig. 7 is a partially enlarged view of a preferred embodiment of the present invention.

1: Ontology

20: The first film layer

40: Thin plate department

50: Joint

60: Second film layer

80: first end

90: second end

Claims (9)

A method for making a paper container, comprising the following steps: Prepare a piece of paper; coating a first film layer on one surface of the paper to form a substrate; cutting the substrate to form a body; Partially removing one end of the main body along a thickness direction to form a recessed part and a thin plate part, the recessed part and the first film layer are located on opposite sides of the main body; coating an adhesive material on the thin plate part and folding and connecting the thin plate part toward the notch to form a hem; and Folding the main body and connecting the folded edge with a joint portion of the main body to form the paper container, wherein the first film layer faces inwardly of the paper container. The method for making a paper container as described in claim 1, further covering a second film layer on the surface of the paper material opposite to the first film layer, wherein the material of the first film layer is the same as that of the second film layer different. The paper container according to claim 1, wherein a thickness of the thin plate part is not more than 2/3 of a thickness of the base material. The method for making a paper container according to claim 1, wherein a thickness of the folded edge is not greater than 1.5 times a thickness of the base material. The method for making a paper container according to claim 1, wherein the body includes a first end and a second end opposite to each other, the hem is located at the first end, the joint is located at the second end, and the first The end and the second end are close to each other and the body is rolled into a cylindrical shape. The method for making a paper container as described in Claim 5, further covering a second film layer on the surface of the paper material opposite to the first film layer, wherein the material of the first film layer is the same as that of the second film layer different; a depth of the recessed part is greater than a thickness of the second film layer; a thickness of the thin plate part is not greater than 2/3 of a thickness of the base material; a thickness of the hem is not greater than that of the base material 1.5 times the thickness; the method of making the paper container additionally includes the steps of: pressing a fold line on the thin plate; the folded and connected part of the thin plate is the paper material; film layer; the material of the first film layer is selected from at least one of polypropylene (Polypropylene, PP) and polyethylene terephthalate (Polyethylene terephthalate, PET); A cut surface in the direction of the length extension of the main body, and one end surface of the thin plate portion abuts against the cut surface. A paper container comprising: A body, enclosing an internal space, including a paper material and a first film layer covering the paper material and facing the internal space, a thin plate part is extended from one end of the main body, and the thin plate part is opposite to the paper material Fold toward a side away from the inner space to form a hem, the hem includes a first section and a second section overlapping in the thickness direction, an adhesive material is arranged between the first section and the second section . The paper container as claimed in claim 7, wherein the thickness of one of the folded edges is not greater than 1.5 times the thickness of one of the body. The paper container as claimed in item 7, wherein an end surface of the first section abuts against the paper material along a length extending direction of the main body.

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