Envelope

Abstract

To provide an envelope that can be prevented from being bent from a zipper part, when bending a sealing tongue piece.SOLUTION: The envelope is formed of single-faced corrugated board 1X, and is folded in half along a lower folding line a, which extends in a direction perpendicular to the flute direction, thereby having a front sheet 2 forming the front side of the envelope 1, and a rear sheet 3 forming the rear side of the envelope 1. The envelope has a bag-like structure in which the inner sides of the front sheet 2 and the rear sheet 3 have an opening at the upper side, and a sealing flap 5 is provided at the upper portion of the rear sheet 3, the flap being folded back to close the opening. The sealing flap 5 is provided on its inner surface with an adhesive G2 applied along the upper edge of the rear sheet 3, a release sheet 12 covering the adhesive G2, and a zipper 11 composed of two discontinuous tear lines 11a and 11b, which are arranged on the rear sheet side 3 of the adhesive G2 and extend along the upper edge of the rear sheet 3 with a predetermined width. The release sheet 12 covers the two discontinuous tear lines 11a and 11b.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to envelopes. [Background technology]

[0002] In recent years, mail delivery, which can be completed by dropping a thin product with a thickness of a few centimeters or less into a mailbox, has become popular for online shopping product delivery. When delivering products by this type of mail delivery, a rigid paper envelope such as double-sided corrugated cardboard or thick paper is sometimes used instead of wrapping the product in cushioning material (see Patent Document 1).

[0003] The envelope in Patent Document 1 is made of single-faced corrugated cardboard with a liner affixed to one side of a corrugated corrugated core, and is folded in half along a lower fold line extending perpendicular to the corrugation direction and squashing the corrugated corrugations in the thickness direction to form a front sheet that constitutes the front side of the envelope and a back sheet that constitutes the back side of the envelope, and the insides of the front sheet and back sheet are bag-shaped with an opening at the top, and a sealing tab is provided above the back sheet by folding it back to close the opening. Furthermore, double-sided tape with release paper is affixed to the inside surface of the sealing tab along the upper edge of the back sheet.

[0004] According to the envelope of Patent Document 1, the opening can be closed and the envelope can be sealed by folding back the sealing flap from which the release paper has been removed onto the outer surface of the front sheet. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2010-208310 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, the envelope of Patent Document 1 has a double-sided tape that is not easy to peel off when opening it. Therefore, it is considered to provide a zipper consisting of two discontinuous slits of a specified width extending along the upper edge of the back sheet on the side closer to the back sheet than the double-sided tape of the sealing flap.

[0007] However, in recent years, in order to reduce storage space, there has been an increase in cases where envelopes are delivered to delivery companies with the sealing flap folded over without removing the release paper.In such cases, if a zipper is installed on the envelope, this part becomes weak, causing a new problem in which the envelope will accidentally bend along one of the two discontinuous slits that make up the zipper, rather than along the original fold line.

[0008] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide an envelope that can prevent the zipper portion from bending when the sealing flap is folded back. [Means for solving the problem]

[0009] The envelope of the present invention is an envelope formed from single-sided corrugated board with a liner attached to one side of a corrugated core, and has a front sheet that forms the front side of the envelope and is folded in half along a lower fold line that extends in a direction perpendicular to the corrugation direction and crushes the corrugated corrugations in the thickness direction, and a back sheet that forms the back side of the envelope, and the insides of the front sheet and the back sheet are bag-shaped with an opening at the top, and a sealing tongue is provided above the back sheet by folding it back to close the opening, and the sealing tongue is provided on its inner surface and has adhesive applied along the upper edge of the back sheet, a release sheet that covers the adhesive, and a zipper consisting of two discontinuous slits that are provided on the back sheet side of the adhesive and extend along the upper edge of the back sheet with a predetermined width, and the release sheet covers the two discontinuous slits (hereinafter referred to as the ``first envelope of the present invention'').

[0010] In the first envelope of the present invention, the release sheet that covers the adhesive on the inside of the sealing flap covers up to the two discontinuous slits, so that when the sealing flap is gradually raised up against the back sheet to make a valley fold along the boundary between the back sheet and the sealing flap, the release sheet can support the two discontinuous slits from the inside.

[0011] Therefore, according to the envelope of the first aspect of the present invention, when the sealing tab is folded back onto the back sheet, bending at the zipper portion can be prevented.

[0012] In the envelope of the first invention, the zipper is preferably provided on the tip side of the center between the base edge and the tip edge of the sealing tab (hereinafter referred to as the "envelope of the second invention").

[0013] In the second envelope of the present invention, the zipper is located toward the tip side of the center between the base edge and the tip edge of the sealing tongue, so that it is relatively far from the boundary line between the back sheet and the sealing tongue, and is close to the adhesive, making it easy to cover with a release sheet to cover it.

[0014] Therefore, according to the envelope of the second invention, when the sealing tab is folded back onto the back sheet, bending at the zipper portion can be further prevented. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing an embodiment of an envelope of the present invention. [Diagram 2] FIG. 2 is a development view of the plate-shaped member of the envelope of FIG. 1. [Diagram 3] 2 is a perspective view showing a manufacturing process of the envelope of FIG. 1, illustrating a folding step of the front sheet. FIG. [Figure 4] 1. FIG. 4 is a perspective view showing a manufacturing process of the envelope of FIG. 1, illustrating a folding step of the side adhesive portion. [Diagram 5] FIG. 2 is a perspective view showing a manufacturing process of the envelope of FIG. 1, illustrating a sealing step using a sealing flap; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention (hereinafter, referred to as "this embodiment") will be described with reference to the drawings.

[0017] As shown in Figure 1, the envelope 1 of this embodiment comprises a front sheet 2, a back sheet 3, a pair of side adhesive portions 4, a sealing flap 5 that seals the upper opening formed by the front sheet 2 and the back sheet 3, a second adhesive G2 (corresponding to the adhesive of the present invention, see Figure 2) formed and arranged on the back side of the sealing flap 5, and a release sheet 12 attached to this second adhesive G2.

[0018] In other words, the front sheet 2 and the back sheet 3 that forms the back side of the envelope are folded in half along a lower fold line a that extends in a direction perpendicular to the column direction and crushes the wavy columns in the thickness direction to form the front side of the envelope, and the inside of the front sheet 2 and the back sheet 3 are bag-shaped with an opening at the top.

[0019] A sealing tongue 5 is provided above the back sheet 3, which is folded back to close the opening, and this sealing tongue 5 has a second adhesive G2 provided on its inner surface and applied along the upper edge of the back sheet 3.

[0020] In addition, between the second adhesive G2 of the sealing tongue 5 and the upper fold line c, an opening zipper 11 is formed, which consists of two discontinuous slits (11a, 11b) of a predetermined width extending along the upper edge of the back sheet 3, and the release sheet 12 covers these two discontinuous slits (11a, 11b).

[0021] The tip edge of the sealing tongue 5 and the upper fold line c are perpendicular to the row direction, so that the sealing tongue 5 is unlikely to bend in an unexpected area.

[0022] In this embodiment, the zipper 11 is provided on the tip side of the center between the base edge and the tip edge, which is the upper fold line c of the sealing tongue 5.

[0023] The envelope 1 is sealed by removing the release sheet 12 from the sealing flap 5 and adhering and fixing it to the front sheet 2 and the side adhesive portion 4 with the second adhesive G2 formed along the leading edge of the sealing flap 5.

[0024] [Composition of single-sided corrugated paperboard 1X] Next, the configuration of the single-faced corrugated paperboard (blank) 1X forming the packaging box 1 will be described.

[0025] As shown in an exploded view in Figure 2, the envelope 1 is formed from a single-faced corrugated paperboard 1X. Figure 2 shows the back side of the single-faced corrugated paperboard 1X, which will be the inside side when assembled into the envelope 1.

[0026] In addition, because the single-faced corrugated paperboard 1X is single-faced, the corrugations caused by the core appear on the back side as circled in Fig. 2, but are omitted from each figure for the sake of convenience in order to make the structure easier to understand. In this embodiment, the corrugations are parallel to the longitudinal direction (the left-right direction in Fig. 2) between the front sheet 2 and the back sheet 3, that is, the side fold line b.

[0027] The single-faced corrugated paperboard 1X has rectangular front and back sheets 2, 3, a pair of isosceles trapezoidal side adhesive portions 4, and an inverted isosceles trapezoidal sealing tongue 5.

[0028] A back sheet 3 is connected to the left side of the front sheet 2 via a lower fold line a. A pair of side adhesive parts 4 are connected to the upper and lower edges of the back sheet 3 via side fold lines b. A sealing tongue 5 is connected to the left side of the back sheet 3 via an upper fold line c.

[0029] In this embodiment, the sealing tongue 5 is flattened all over so that it can be easily bonded and deformed.

[0030] The sealing tongue 5 has a strip-shaped zipper 11 extending vertically (vertical in FIG. 2, same below) from the center in the left-right direction (width direction) to the tip edge. The zipper 11 has the function of dividing the sealing tongue 5 into two in the width direction by breaking the area surrounded by the zipper 11 of the sealing tongue 5, thereby opening the sealed envelope 1.

[0031] The zipper 11 is formed by an upper breakable line 11a and a lower breakable line 11b which are discontinuous cuts aligned in a row, and which are formed in parallel at regular intervals.

[0032] In the illustrated example, the zipper 11 is arranged in a row with a gap between them, with the straight portions arranged parallel to each other so that the folded sides of the L-shaped cut lines face each other, and the folded sides are the break start sides.

[0033] Furthermore, at the tear initiation position formed on one side end of the sealing tongue 5, an inverted U-shaped tear initiation portion 11c is formed by a pair of parallel straight cut lines and an arc-shaped cut line connecting the cut lines to the ends on the side end side of the sealing tongue 5. The opener can tear the zipper 11 by picking up and pulling the inverted U-shaped tear initiation portion 11c.

[0034] A second adhesive G2 used during sealing is applied and positioned on the sealing tongue 5 from the position where the zipper 11 is formed to the tip side (left side in Figure 2) to form an adhesive layer in a certain area, and a release sheet 12 is further attached on top of this second adhesive G2 to protect it.

[0035] Although the second adhesive G2 and the protective release sheet 12 will be positioned in a later process, these are shown as the intended position for forming a layer of the second adhesive G2 and the intended position for attaching the release sheet 12 in order to clarify the positional relationship with the zipper 11. The distance t1 between the intended position for forming a layer of the second adhesive G2 and the tip edge of the sealing tongue 5 is approximately equal to the distance t2 between the intended position for forming a layer of the second adhesive G2 and the upper breakable line 11a of the zipper 11, i.e. t1=t2 or t1≈t2.

[0036] The peel-off sheet 12 extends to the tip and both side ends of the sealing tongue 5 so as to protrude outward from the edge of the sealing tongue 5. There is no particular limitation on the length by which the peel-off sheet 12 extends beyond the edge of the sealing tongue 5, but it is a length that can be picked up by a person, and is 2 to 5 mm at the tip and a minimum length of about 3 to 6 mm at both side ends.

[0037] Furthermore, the release sheet 12 covers the two breakable lines 11 a and 11 b that constitute the zipper 11 .

[0038] The release sheet 12 may be a release paper made of paper or a release film made of a resin film, but in this embodiment, a release paper is preferably used. The release paper is composed of a paper substrate and a release layer in contact with the adhesive layer. A sealing layer may be formed between the substrate and the release layer to prevent the chemicals in the release layer from penetrating into the substrate.

[0039] The substrate can be selected from semi-bleached paper, fine paper, glassine paper, etc., depending on the application.

[0040] The filler layer may be, for example, polyethylene, and has a thickness of about several to several tens of μm. For substrates with low permeability, such as glassine paper, the filler layer may be omitted. In addition, in the case of a release sheet 12 that uses a general paper substrate and is recyclable, a clay coat layer or a PVA (polyvinyl alcohol) layer may be used as the filler layer so that there is no problem in mixing it when recycling it as recycled paper.

[0041] Polyethylene laminated paper, which uses polyethylene as a filling layer, has excellent smoothness, but the polyethylene on the surface has poor heat resistance and melts at around 110°C, so when heat resistance is required, it is a good idea to use glassine paper.

[0042] The release agent used in the release layer may be silicone-based or non-silicone-based, but in this embodiment, a silicone-based resin is used.

[0043] Silicone resins include solvent-based, solventless, and emulsion-based types. In this embodiment, solvent-based silicones, which allow fine adjustment of the release performance, are preferred, but solventless silicones may also be used in consideration of the environmental impact.

[0044] The release layer can be formed by applying a silicone resin and then curing the silicone resin by applying heat in a drying oven (ultraviolet curing type is also available).

[0045] The release papers as described above are commercially available and can be purchased from the general market.

[0046] The adhesive constituting the second adhesive G2 may be any adhesive generally used for sealing the mouth of an envelope, such as a hot melt agent or a pressure sensitive adhesive mainly composed of acrylic resin. The thickness of the adhesive to be applied is not particularly limited, but is, for example, 1 mm or less.

[0047] [Envelope 1 Production] Next, the procedure for manufacturing the envelope 1 will be described.

[0048] A zipper 11 is pre-formed on the single-faced corrugated paperboard 1X.

[0049] First, as shown in FIG. 3, the front sheet 2 is folded along the lower fold line a relative to the back sheet 3, so that the inner surface of the front sheet 2 is superimposed on the inner surface of the back sheet 3.

[0050] Then, before the next second folding step, the inner surface of the side adhesive portion 4 is compressed and flattened with a roller or the like in order to improve flexibility and adhesiveness.

[0051] Next, a first adhesive G1 is applied to the inner surface, which is the back surface side, of the side adhesive portion 4 to form an adhesive layer of the first adhesive G1.

[0052] The first adhesive G1 can be formed by applying a first adhesive such as an emulsion-based adhesive whose main component is vinyl acetate resin, an emulsion-based adhesive whose main component is ethylene / vinyl acetate copolymer resin (EVA), or a hot melt agent.

[0053] Next, as shown in Figure 4, the side adhesive portion 4 is folded along the side fold line b toward the outer surface of the front sheet 2, so that the inner surface of the side adhesive portion 4 is superimposed on the outer surface, which is the surface of the front sheet 2, and the inner surface of the side adhesive portion 4 and the outer surface of the front sheet 2 are bonded together.

[0054] Next, the second adhesive G2 is applied to form a layer of the second adhesive G2, and the release sheet 12 is attached to the second adhesive G2 in a predetermined position. At this time, the release sheet 12 is attached to the tip side and both side ends of the sealing tongue 5 so as to cover the zipper 11 and to extend outward beyond the edges of the sealing tongue 5.

[0055] Next, as shown in FIG. 1, the upper edges of the front sheet 2 and the back sheet 3 are brought close together, and then the sealing tab 5 is folded along the upper fold line c so as to be superimposed on the outer surface of the front sheet 2, thereby forming a fold in the sealing tab 5.

[0056] Through the above steps, an envelope 1 as shown in FIG. 1 is produced from single-faced corrugated paperboard 1X.

[0057] When sealing a product in this envelope 1, as shown in FIG. 5, the sealing tab 5, which has a fold, is first opened, the product is inserted from the upper opening of the envelope 1, and the release sheet 12 attached to the back side of the sealing tab 5 is removed.

[0058] Next, the sealing tab 5 is laminated on the outer surface of the front sheet 2 and attached to the front sheet 2 by an adhesive layer of the second adhesive G2 provided at the leading edge of the sealing tab 5. Thereafter, for example, a shipping label (not shown) is attached to the outer surface of the front sheet 2 or the back sheet 3, and the product sealed in the envelope 1 is shipped. Naturally, the information to be written on the shipping label may be printed directly on the outer surface of the front sheet 2 or the back sheet 3.

[0059] The actions and effects of this embodiment will be described below. [Actions and Effects]

[0060] In this embodiment, the release sheet 12 that covers the second adhesive G2 on the inside of the sealing tongue 5 covers up to the two discontinuous slits (11a, 11b). Therefore, when the sealing tongue 5 is gradually raised against the back sheet 3 to be folded along the border between the back sheet 3 and the sealing tongue 5, the release sheet 12 can support the two discontinuous slits (11a, 11b) from the inside.

[0061] Therefore, according to the envelope of this embodiment, when the sealing tab 5 is folded back against the back sheet 3, bending at the zipper 11 can be prevented.

[0062] In addition, in the envelope of this embodiment, the zipper 11 is located toward the tip side of the center between the base edge and the tip edge of the sealing tongue 5, so it is relatively far away from the boundary line between the back sheet 3 and the sealing tongue 5, and is close to the second adhesive G2, so it is easy to cover it with the release sheet 12 that covers it.

[0063] Therefore, according to the envelope 1 of this embodiment, when the sealing flap 5 is folded back against the back sheet 3, bending at the zipper 11 can be further prevented.

[0064] Since single-sided corrugated cardboard 1X is single-sided corrugated cardboard, it has the characteristic of easily bending when subjected to an external force that bends it parallel to the corrugation direction. However, in this embodiment, the corrugation is parallel to the longitudinal direction (left and right direction in Figure 2) between the front sheet 2 and the back sheet 3, i.e., the side fold line b. Therefore, when folding back the sealing tongue 5, it is difficult for it to bend unintentionally at a place other than the upper fold line c, and folding defects are unlikely to occur.

[0065] In the envelope 1 of this embodiment, the second adhesive G2 is formed on the sealing flap 5, so that the sealing flap 5 can be easily adhered by simply removing the release sheet 12.

[0066] In the envelope 1 of this embodiment, the sealing tab 5 has a fold, so that when sealing a product, the sealing tab 5 can be easily superimposed on the outer surface of the front sheet 2 and adhered thereto.

[0067] In the sealed envelope 1 of this embodiment, the tip side of the sealing flap 5 is fixed with a second adhesive G2, and a zipper 11 is formed at a base position relative to the position where this second adhesive G2 is formed, so that the envelope 1 can be easily opened by simply breaking the sealing flap 5 along this zipper 11.

[0068] The envelope 1 of this embodiment is made from single-sided corrugated cardboard, and therefore has excellent flexibility and can easily be deformed into a shape that matches the contents, such as a stored product, making it easy to store the contents, such as a product.

[0069] [Variations] The envelope of the present invention is not limited to the above embodiment, and may be in the following form.

[0070] In this embodiment, the side adhesive part 4 is adhered by the first adhesive G1, but it can also be fixed to the front panel by adhesive tape, etc. Also, in this embodiment, the side adhesive part 4 is described as being laminated and adhered to the outer surface of the front sheet 2 (outer adhesive), but the side adhesive part 4 can also be laminated and adhered to the inner surface of the front sheet 2 (inner adhesive).

[0071] In the present embodiment, an example in which the second adhesive G2 is formed on the sealing tongue 5 has been described, but instead of forming the second adhesive G2, a double-sided adhesive tape may be attached.

[0072] In this embodiment, an example has been shown and described in which the first and second adhesives G1 and G2 are formed in an area of ​​a certain area, but the present invention is not limited to this, and multiple adhesives formed in stripes may be combined, for example, as when adhesive is ejected from a nozzle.

[0073] In this embodiment, the zipper 11 has been described as having L-shaped breaks and discontinuous breakable lines arranged in parallel with a constant width, but the present invention is not limited to this, and the breaks in the breakable lines may be linear.

[0074] In this embodiment, an example has been shown in which the release sheet 12 covers the two breakable lines 11a, 11b, but the present invention is not limited to this, and the release sheet 12 may cover only at least the upper breakable line 11a.

[0075] In this embodiment, an example has been described in which release paper is used as the release sheet 12, but a release film may be used instead of the release paper. Examples of release films include polyethylene terephthalate (PET), biaxially oriented polypropylene (OPP), polypropylene (PP), and polyethylene (PE), which are superior to paper in terms of smoothness, gloss, and transparency.

[0076] The front sheet 2 and the back sheet 3 are not limited to a rectangular shape, and may be polygonal, such as a hexagon or octagon, as long as the base edges are connected by a fold line. In this case, it is necessary to provide (n-2) side attachment parts 4 (n is the number of corners).

[0077] In this embodiment, an example in which a side adhesive portion 4 is provided has been shown and explained, but the present invention is not limited to this, and the side adhesive portion 4 may be omitted and the insides of the side edges of the front sheet 2 and the back sheet 3 may be directly bonded together.

[0078] The side attachment parts 4 are not limited to an isosceles trapezoid shape, but may be rectangular, and may be shorter than the side edges of the front sheet 2 as long as they are connected to a part of the front sheet 2. [Industrial Applicability]

[0079] The envelope of the present invention can be preferably used as an envelope for transporting light and thin products, such as mail-order items in the so-called home delivery business, or similar mail-order items. [Explanation of symbols]

[0080] 1 envelope 1X Single-sided Corrugated Paperboard 2. Top sheet 3 Back sheet 4 side adhesive part 5 Sealing tongue piece 11 Zipper (break) 12 Release sheet G1 First Adhesive G2 Second Adhesive a Bottom fold line b side fold line c Top fold line

Claims

1. An envelope made of single-sided corrugated cardboard with a liner attached to one side of a corrugated corrugated core, The envelope has a front sheet that forms the front side of the envelope and a back sheet that forms the back side of the envelope, the front sheet being folded in half along a lower fold line that is formed by squashing the wavy columns in the thickness direction and extending in a direction perpendicular to the column direction, and the inside of the front sheet and the back sheet are bag-shaped with an opening at the top, A sealing tongue is provided above the back sheet to close the opening by folding it back, The sealing tongue is provided on its inner surface and has an adhesive applied along the upper edge of the back sheet, a release sheet covering the adhesive, and a zipper consisting of two discontinuous slits provided on the back sheet side of the adhesive and extending along the upper edge of the back sheet with a predetermined width, The release sheet covers the two discontinuous cuts.

2. 2. The envelope of claim 1, The envelope is characterized in that the zipper is provided on the tip side of the center between the base edge and the tip edge of the sealing tongue.

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