Fabrication method of envelope type package

Abstract

To provide a fabrication method of an envelope-type package, which, when fabricating an envelope-type package using a material sheet having an uneven pattern on one side of a single-faced corrugated board or the like, is capable of preventing the uneven pattern of a connection flap that has been pressed flat from returning to its original shape, preventing bonding strength from decreasing, and facilitating folding when the package is formed into an envelope shape.SOLUTION: A fabrication method of an envelope-type package includes: pressing flat an uneven pattern of connection flaps 4 on both sides of a front part 2; applying paste to a predetermined position on a top face of the connection flaps 4 with the uneven pattern having been pressed flat; folding the connection flaps 4, to which the paste has been applied, over a top face of a back part 3; and bonding the faces.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for manufacturing an envelope-type package using a material sheet having a concavo-convex pattern on one side, such as single-sided cardboard, to manufacture the envelope-type package.

Background Art

[0002] Recently, with the spread of mail-order sales such as online shopping, the transportation of goods using postal services and courier services has been frequently used. Among them, the demand for envelope-type packaging packages that can be mailed has been increasing.

[0003] Conventionally, various envelope-type packages having cushioning properties for packaging items that dislike impact, such as electrical components, jewelry, cosmetics, and CDs, have been proposed. For example, a cushion envelope with a plastic bubble sheet cushioning material inside the envelope is well known.

[0004] However, such a cushion envelope with a plastic bubble sheet cushioning material inside the envelope has a problem that when it is discarded, the envelope (paper) and the plastic bubble sheet cushioning material must be separated, which is time-consuming when discarded. Also, in terms of manufacturing, it requires the labor and time to install a separate plastic bubble sheet cushioning material inside the envelope, and there is a problem that the cost becomes high due to the large amount of materials and labor required.

[0005] In order to solve these problems, in recent years, an envelope-type package using a material sheet such as a single-sided corrugated cardboard having cushioning properties has been proposed. For example, as shown in FIG. 10, a manufacturing method of such an envelope-type package is such that, for a material sheet 1Y of single-sided corrugated cardboard, a rectangular back surface portion 3 is continuously provided via a first fold line a1 on the right end side in the left-right direction (the left-right direction in FIG. 10) of a rectangular front surface portion 2, and connecting flaps 4 are continuously provided via a second fold line a2 on both side edges in the up-down direction (the up-down direction in FIG. 10) of the front surface portion 2. When cutting the material sheet into the developed shape of the envelope (i.e., before folding), in the case where it is formed into an envelope shape, in order to strengthen the adhesion between the connecting flap 4 and the back surface portion 3, the wavy irregularities of the connecting flaps 4 on both sides of the front surface portion 2 are crushed. As a result, the wavy irregularities of the connecting flap 4 that become the adhesion portion are flattened. Note that an upper end flap portion 5 is continuously provided via a third fold line a3 on the left end side in the left-right direction (the left-right direction in FIG. 10) of the front surface portion 2.

[0006] Conventionally, as a manufacturing apparatus for an envelope-type package, a jacket folding device in a box-making machine or the like for manufacturing a flat box such as a record jacket from a paper-made material sheet has been proposed (Patent Document 1).

[0007] The jacket folding device in a box-making machine or the like disclosed in Patent Document 1 first bends the margins on both sides inward while horizontally conveying a material sheet forward by a conveyor belt serving as a conveying device. Next, an adhesive is applied to the margins. Then, while conveying the material sheet, the front flap is bent upward and rearward and adhered to the margins. A guide device for bending the front flap is provided above the conveyor belt. Further, an air outlet provided upward between the lower parts of the conveying devices, that is, between two conveyor belts, blows air upward, and this air pushes the front end of the front flap upward and is configured to cause it to enter the guide device.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] However, when manufacturing an envelope-type package using single-sided corrugated cardboard as shown in Fig. 10 described above, when cutting the single-sided corrugated cardboard into the unfolded shape of the envelope (i.e., before folding), if the corrugations of the connecting flap 4 are crushed, then, as time passes before it is formed into an envelope shape, the crushed corrugated portion tends to gradually return to its original shape. When it is formed into an envelope shape, there is a problem that the adhesive area decreases, resulting in a decrease in adhesive strength.

[0010] Also, in the method as shown in Fig. 10 described above, the pre-crushed corrugated portion tends to gradually return to its original shape over time. When processing into an envelope shape, the applied glue does not spread easily, and a vinyl acetate-based adhesive cannot be used as the adhesive, and there is a problem that a costly hot melt has to be used.

[0011] Furthermore, in the method as shown in Fig. 10 described above, if the corrugations of the connecting flap 4 are crushed before folding the single-sided corrugated cardboard cut into the unfolded shape of the envelope, when processing into an envelope shape, there is a problem that it is difficult to fold and wrinkles occur in the folding process.

[0012] Therefore, the present invention has been made in view of the above problems, and when manufacturing an envelope-type package using a material sheet having an uneven pattern on one side such as single-sided corrugated cardboard, it is possible to suppress the tendency of the uneven pattern of the crushed connecting flap to return to its original shape, prevent a decrease in adhesive strength, and make it easy to fold when processing into an envelope shape, and an object of the present invention is to provide a method for manufacturing an envelope-type package.

Means for Solving the Problems

[0013] The manufacturing method of the envelope-type package of the present invention is a manufacturing method of an envelope-type package that manufactures an envelope-type package using a material sheet having an uneven pattern on one side. A rectangular back surface portion is continuously provided via a fold line at the lower edge of the rectangular front surface portion, and the material sheet cut into the developed shape of an envelope in which connecting flaps are continuously provided via fold lines at both side edges of the front surface portion is transported to a downstream process in a horizontal state with the uneven pattern facing downward. A folding step of guiding the front surface portion downward while transporting the material sheet by the transporting step so that the uneven pattern of the material sheet faces inward and folding it toward the back surface portion. A crushing step of crushing the uneven pattern of the connecting flaps on both sides of the front surface portion folded in the folding step. A glue application step of applying glue to a predetermined position on the upper surface of the connecting flap whose uneven pattern has been crushed in the crushing step. And an adhesion step of folding the connecting flaps on both sides of the front surface portion onto the upper surface of the back surface portion and adhering them to the back surface portion (hereinafter referred to as "the manufacturing method of the envelope-type package of the first aspect of the present invention").

[0014] The manufacturing method of the envelope-type package of the first aspect of the present invention is to previously cut a material sheet having an uneven pattern on one side into the developed shape of an envelope in which a rectangular back surface portion is continuously provided via a fold line at the lower edge of a rectangular front surface portion and connecting flaps are continuously provided via fold lines at both side edges of the front surface portion. After folding the front surface portion toward the back surface portion so that the uneven pattern of the obtained material sheet in the developed shape of the envelope faces inward, the uneven pattern of the connecting flaps on both sides of the front surface portion is crushed, and glue is applied to a predetermined position on the upper surface of the connecting flap whose uneven pattern has been crushed. By folding and adhering the glue-applied connecting flap onto the upper surface of the back surface portion, by crushing the uneven pattern of the connecting flap immediately before applying the glue, the tendency for the crushed uneven pattern to return to its original shape can be suppressed. Therefore, a decrease in the adhesion area between the connecting flap and the back surface portion can be avoided, and a decrease in adhesion strength can be prevented. Also, when forming into an envelope shape, it can be made easier to fold. Also, the applied glue spreads easily, and an inexpensive vinyl acetate-based adhesive can be used.

[0015] In addition, in the method for manufacturing the envelope-type package of the first aspect of the present invention, it is possible to print information including a barcode on the upper surface while conveying the uneven pattern of the material sheet having the uneven pattern on one side downward. That is, printing using an inkjet printer becomes easy. It is possible to print information including different barcodes for each packaging package.

[0016] Therefore, according to the method for manufacturing the envelope-type package of the first aspect of the present invention, it is possible to suppress the uneven pattern of the crushed connecting flap from returning to its original shape and prevent the adhesive strength from decreasing, and when forming into an envelope shape, it becomes easier to bend. In addition, an inexpensive vinyl acetate-based adhesive can be used. Also, it is possible to print information including a barcode on the upper surface while conveying the uneven pattern of the material sheet having the uneven pattern on one side downward. Furthermore, by using a material sheet having an uneven pattern on one side, it is possible to obtain an envelope-type package that has cushioning properties and is environmentally friendly, being low-cost and recyclable.

[0017] In the method for manufacturing the envelope-type package of the first aspect of the present invention, in the crushing step, it is preferable to crush the uneven pattern of the connecting flap stepwise in a plurality of times (hereinafter, referred to as "the method for manufacturing the envelope-type package of the second aspect of the present invention").

[0018] In the method for manufacturing the envelope-type package of the second aspect of the present invention, in the crushing step of the first aspect of the present invention, by crushing the uneven pattern of the connecting flap, which becomes the adhesive part when forming into an envelope shape, stepwise in a plurality of times, it is possible to surely suppress the crushed uneven pattern from returning to its original shape.

[0019] Therefore, in the method for manufacturing the envelope-type package of the second aspect of the present invention, it is possible to surely suppress the uneven pattern crushed in the crushing step from returning to its original shape. Therefore, it is possible to surely avoid a decrease in the adhesive area between the connecting flap and the back surface part and surely prevent a decrease in the adhesive strength.

[0020] In the method for manufacturing the envelope-type package of the second invention, in the crushing step, it is preferable to gradually crush the uneven patterns on both sides of the connecting flaps on the folded surface part by three crushing rollers with different clearances (hereinafter referred to as "the method for manufacturing the envelope-type package of the third invention").

[0021] In the method for manufacturing the envelope-type package of the third invention, in the second invention, in the crushing step, by gradually crushing the uneven patterns on both sides of the connecting flaps on the folded surface part by three crushing rollers with different clearances, it is possible to surely suppress the crushed uneven patterns from returning to their original shape and ensure the adhesive strength of the adhesive part. Further, multiple crushing processes can be continuously performed in-line, improving the production efficiency.

[0022] Therefore, according to the method for manufacturing the envelope-type package of the third invention, it is possible to surely suppress the crushed uneven patterns from returning to their original shape, ensure the adhesive strength of the adhesive part, and continuously perform multiple crushing processes in-line, improving the production efficiency.

[0023] In the method for manufacturing the envelope-type package of the first to third inventions, it is preferable to further include a printing step of printing information including a barcode on the upper surface of the back part by printing means installed upstream of the folding step (hereinafter referred to as "the method for manufacturing the envelope-type package of the fourth invention").

[0024] In the method for manufacturing the envelope-type package of the first to third inventions, by having a printing step of printing information including a barcode on the upper surface of the back part by printing means installed upstream of the folding step, it is possible to print information including a barcode on the upper surface of the material sheet having uneven patterns on one side while transporting the material sheet with the uneven patterns facing downward.

[0025] Therefore, in the envelope-type package of the fourth invention, information including a different barcode can be printed for each envelope-type package, and printing with an inkjet printer becomes easy.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0027] Hereinafter, with reference to FIGS. 1 to 9, a method for manufacturing an envelope-type package according to an embodiment of the present invention (hereinafter simply referred to as "this embodiment") and an envelope-type package 1 manufactured using this method for manufacturing an envelope-type package will be described.

[0028] As shown in FIG. 1, the method for manufacturing an envelope-type package according to this embodiment includes a material sheet 1X (for example, single-sided corrugated board) having a concavo-convex pattern (mountain-folded portion) on one side. The rectangular back surface portion 3 is continuously provided at the lower edge of the rectangular front surface portion 2 via a fold line, and connecting flaps 4 are continuously provided at both side edges of the front surface portion 2 via fold lines. A cutting step S1 of cutting into the developed shape of the envelope; a conveying step S2 of conveying the material sheet 1X in the developed shape of the envelope obtained in this cutting step horizontally with the concavo-convex pattern facing downward to the downstream process; a printing step S3 of printing information including a barcode 7 on the upper surface while conveying the concavo-convex pattern of the material sheet 1X downward; a folding step S4 of folding the front surface portion 2 toward the back surface portion 3 so that the concavo-convex pattern of the material sheet 1X faces inward; a crushing step S5 of crushing the concavo-convex pattern of the connecting flaps 4 on both sides of the front surface portion 2 folded in the folding step S4; a glue application step S6 of applying glue to a predetermined position on the upper surface of the connecting flap 4 whose concavo-convex pattern has been crushed in the crushing step S5; and an adhesion step S7 of folding the connecting flaps 4 on both sides of the front surface portion 2 onto the upper surface of the back surface portion 3 and adhering them to the back surface portion 3.

[0029] The envelope-type package 1 manufactured using the manufacturing method of the envelope-type package of this embodiment is composed of a single sheet of single-sided corrugated cardboard and is an envelope-type package having cushioning properties on the inner surface. That is, the envelope-type package 1 includes a rectangular front surface portion 2 (corresponding to the front surface of the envelope), a back surface portion 3 (corresponding to the back surface of the envelope) continuously provided at the lower end edge of the front surface portion 2, a pair of connecting flaps 4 (corresponding to the adhesive margins of the envelope) continuously provided at both side edges of the front surface portion 2, and an upper end flap portion 5 (corresponding to the sealing piece of the envelope) continuously provided at the upper end edge of the front surface portion 2. Further, an opening zipper 6 is formed on the upper end flap portion 5. The opening zipper 6 is composed of two parallel broken lines. At both ends of this opening zipper 6, there are formed gripping portions that can be gripped with fingers. Furthermore, a barcode 7 is printed on the back surface portion 3.

[0030] As shown in FIG. 3, the envelope-type package 1 is made of a material sheet 1X cut from a single-sided corrugated cardboard sheet having a substantially rectangular shape. In FIG. 3, the surface having the uneven pattern (step mountain portion) of the single-sided corrugated cardboard is shown. The left side of the material sheet 1X in FIG. 3 becomes the front surface portion 2 of the envelope-type package 1 when assembled as the envelope-type package 1 as shown in FIG. 2. The right end side in the left-right direction (in the left-right direction in FIG. 3) of the front surface portion 2 becomes the back surface portion 3 of the envelope-type package 1 when assembled as the envelope-type package 1 as shown in FIG. 2. Both sides in the up-down direction (in the up-down direction in FIG. 3) of the front surface portion 2 become the pair of connecting flaps 4 of the envelope-type package 1 when assembled as the envelope-type package 1 as shown in FIG. 2. The left end side in the left-right direction (in the left-right direction in FIG. 3) of the front surface portion 2 becomes the upper end flap portion 5 of the envelope-type package 1 when assembled as the envelope-type package 1 as shown in FIG. 2. Also, the steps of the single-sided corrugated cardboard are arranged in the length direction (in the left-right direction in FIG. 3).

[0031] As shown in Fig. 3, on the material sheet 1X, a first folding line a1 that partitions the front surface portion 2 and the back surface portion 3 is formed. The front surface portion 2 and the back surface portion 3 are connected in series via this first folding line a1. Also, on the material sheet 1X, a second folding line a2 that partitions the front surface portion 2 and a pair of connecting flaps 4 is formed. The front surface portion 2 and the pair of connecting flaps 4 are connected in series via this second folding line a2. Further, on the material sheet 1X, a third folding line a3 that partitions the front surface portion 2 and the upper end flap portion 5 is formed. The front surface portion 2 and the upper end flap portion 5 are connected in series via this third folding line a3. Also, on the upper end flap portion 5, a strip-shaped unsealing zipper 6 composed of two parallel breaking lines with both ends connected is formed.

[0032] Hereinafter, the process of assembling the envelope-type package 1 using the manufacturing method of the envelope-type package of this embodiment will be described with reference to Figs. 1 to 9.

[0033] As shown in Fig. 1, in the process of assembling the envelope-type package 1 from the material sheet 1X, first, in the cutting process S1, the cardboard of single-sided corrugated board is cut into the unfolded shape of the envelope as shown in Fig. 3.

[0034] Next, in the conveying step S2, using a conveying device 10 composed of a conveyor belt, the material sheet 1X in the developed shape of the envelope obtained in the cutting step S1 is conveyed one by one by the conveyor belt to each downstream step (printing step S3, folding step S4, crushing step S5, glue application step S6, bonding step S7) in a horizontal state with the uneven pattern facing downward. In this case, the material sheet 1X is placed on the conveyor belt such that the surface portion 2 to which the upper end flap portion 5 is continuously provided is in the front and the back surface portion 3 is in the rear. The conveying device 10 has an upper conveying belt 11 and lower conveying belts 12a and 12b. The lower conveying belts 12a and 12b are installed with a predetermined interval at the bending portion 30. Each of these upper conveying belt 11, lower conveying belts 12a and 12b is composed of two belts running side by side with a predetermined interval. The material sheet 1X is placed and conveyed straddling these two belts. Also, the lower conveying belts 12a and 12b each have a driving force by a motor. On the other hand, since the upper conveying belt 11 does not have a driving force, it is pressed against the lower conveying belts 12a and 12b by a plurality of pressing rollers 13 installed on the upper surface and is moved in the conveying direction.

[0035] Next, in the printing step S3, with an inkjet printer 20 installed above the conveyor belt, while conveying the material sheet 1X with the uneven pattern facing downward by the conveying device 10, information including a barcode is printed on its upper surface. In this case, for example, information including a different barcode may be printed for each envelope-type package. Then, the material sheet 1X printed with the information including the barcode is conveyed to the folding step S4.

[0036] Next, in the folding step S4, the surface portion 2 is folded toward the back portion 3 so that the concavo-convex pattern of the material sheet 1X faces inward. This folding step S4 is performed at the bending portion 30 (the divided portion of the lower conveyor belt) of the conveying device 10. The bending portion 30 includes a bending guide portion 31 at the lower part between the lower conveyor belts 12a and 12b of the conveying device 10 (on the outlet side of the bending portion 30), a pressing means 32 at the inlet side of the bending portion 30 for guiding the surface portion 2 of the material sheet 1X downward obliquely in the traveling direction while pressing it from above to the bending guide portion 31, a lifting means 33 for supporting the back portion 3 of the material sheet 1X from below so that the back portion 3 travels straight horizontally and lifting the pressing means 32, and a timing sensor 34 for detecting the conveyed material sheet 1X are provided.

[0037] The bending guide portion 31 is used to bend the surface portion 2 of the material sheet 1X downward and rearward. It mainly consists of a guide plate 31a, a guide member 31b, and a stopper 31c that is attached to be vertically adjustable along the surface of the guide plate 31. The pressing means 32 is composed of a pair of pressing rollers 32a that can press the two parallel belts of the upper conveying belt 11 downward. This pair of pressing rollers 32a is biased downward by a spring or the like and is configured to press the surface portion 2 passing through via the conveying belt 11 downward. The lifting means 33 is composed of a pair of lifting rollers 33a, a rotating arm 33b, and an air cylinder 33c. Based on the detection signal of the timing sensor 34, the operation of the air cylinder 33c is controlled. For example, when the tip of the material sheet 1X is detected, the timing sensor 34 turns on (NO). After the material sheet 1X moves a predetermined distance (after the surface portion 2 has passed), the air cylinder 33c retracts, raising the pair of lifting rollers 33a to support the back surface portion 3 from below and lifting the pair of pressing rollers 32a via the back surface portion 3 and the upper conveying belt 11 to return the upper conveying belt 11 to the horizontal position. After the material sheet 1X moves a further predetermined distance (after the back surface portion 3 has passed), the air cylinder 33c extends, lowering the pair of lifting rollers 33a, so that the pair of pressing rollers 32a is configured to press the front end of the surface portion 2 downward via the conveying belt 11 by the biasing spring. An air outlet 35 for blowing air downward is provided above the bending portion 30. It is controlled to blow air from the air outlet 35 while the surface portion 2 of the material sheet 1X enters the bending portion 30. The air blown out from this air outlet 35 functions as an auxiliary means to press the front end of the surface portion 2 downward together with the pressing means 32 and make it enter the bending guide portion 31.

[0038] In this folding step S4, first, as shown in FIG. 4, while conveying the material sheet 1X in the unfolded shape of the envelope, the front end of the front surface portion 2 with the upper end flap portion 5 continuously provided is lowered obliquely downward and guided to the folding guide portion 31. Here, the pair of pressing rollers 32a press the front end of the front surface portion 2 downward via the conveyor belt 11 by the biasing force of the biasing spring (for example, the pressing-down width d in FIG. 4). Further, air is blown downward from the air outlet 35 provided above the folding guide portion 31, and the air presses the front end of the front surface portion 2 downward. Thereby, the front end of the front surface portion 2 is made to enter the folding guide portion 31. Next, as shown in FIG. 5, when the entire front surface portion 2 has entered the folding portion 30 (that is, when the back surface portion 3 continuously provided on the front surface portion 2 has entered the folding portion 30), the air cylinder 33c operates, pulls up the lifting roller 33a, and via the back surface portion 3 and the upper conveyor belt 11, the pair of pressing rollers 32a are lifted, the upper conveyor belt 11 is returned to the horizontal position, and the back surface portion 3 is sandwiched between the upper conveyor belt 11 and the lifting roller 33a, and supported from below so that the back surface portion 3 advances straight horizontally. Thereby, the conveying force can be ensured, and the stabilization of the conveyance in the folding step can be realized. Then, as shown in FIG. 6, after the front end of the front surface portion 2 that has entered the folding guide portion 31 abuts against the stopper 31c, the front surface portion 2 is folded toward the back surface portion 3 that advances straight on the conveyor belt and is folded along the first fold line a1. In this case, the concavo-convex pattern of the back surface portion 3 remains downward, the concavo-convex pattern of the front surface portion 2 becomes upward, and the connecting flaps 4 on both sides of the front surface portion 2 are exposed from both side ends of the back surface portion 3. Then, it is conveyed to the crushing step S5 in this folded state.

[0039] Next, in the crushing step S5, the uneven patterns of the connecting flaps 4 on both sides of the folded surface portion 2 are crushed. This crushing step S5 is performed by crushing means 40 installed downstream of the bending portion 30. As shown in FIG. 7, the crushing means 40 includes three crushing rollers 41a, 41b, 41c with different clearances, three support rollers 42a, 42b, 42c provided below the three crushing rollers 41a, 41b, 41c, and three adjusting screws 43a, 43b, 43c for adjusting the clearances of the three crushing rollers 41a, 41b, 41c. In the crushing step S5, as shown in FIGS. 7(A) and 7(B), the connecting flaps 4 on both sides of the surface portion 2 sequentially pass under the three crushing rollers 41a, 41b, 41c with different clearances, and the uneven patterns of the connecting flaps 4 are gradually crushed by these three crushing rollers 41a, 41b, 41c. Here, as shown in FIG. 7(C), the clearance of the first roller 41a is set as h1, the clearance of the second roller 41b is set as h2, and the clearance of the third roller 41c is set as h3, such that h1 > h2 > h3. Also, the clearances of the three crushing rollers 41a, 41b, 41c can be adjusted respectively with the adjusting screws 43a, 43b, 43c. In the present embodiment, for example, when the thickness of the material sheet 1X is A, the clearance h1 of the first roller 41a is set to h1 ≥ A, the clearance h2 of the second roller 41b is set to h2 ≤ h1, and the clearance h3 of the third roller 41c is set to h3 ≤ h2. Thereby, the uneven patterns of the connecting flaps 4 are surely crushed and become relatively flat. The crushed portion is used as an adhesive surface (see FIG. 8). Also, the clearances of the three crushing rollers 41a, 41b, 41c can be adjusted according to the thickness of the material sheet 1X used.

[0040] Next, in the glue application step S6, as shown in FIG. 8, glue 8 is applied to a predetermined position on the upper surface of the connecting flap 4 where the uneven pattern has been crushed in the crushing step S5. Here, the back surface portion 3 is conveyed in a state where it is positioned above the front surface portion 2, and glue is discharged from a pair of glue discharge nozzles 50 installed above the conveyor belt, and the glue 8 is applied in a line shape to the upper surface of the connecting flap 4 where the uneven patterns on both sides of the front surface portion 2 have been crushed.

[0041] Finally, in the bonding step S7, the connecting flaps 4 respectively connected to both sides of the front surface portion 2 are folded onto the upper surface of the back surface portion 3 and bonded to the back surface portion 3 by folding means 60 having a folding guide and a crimping portion. Thereby, the envelope-type package 1 is assembled and becomes the state shown in FIG. 2.

[0042] FIG. 9 shows the state of the material sheet processed in each step of the method for manufacturing the envelope-type package of the present invention. In FIG. 9, the state as seen from above the conveyor belt is shown. FIG. 9(A) shows a state where information including the barcode 7 is printed on the upper surface of the back surface portion 3 in the printing step S3. FIG. 9(B) shows a state where the front surface portion 2 is folded under the back surface portion 3 in the folding step S4. In this case, the connecting flaps 4 on both sides of the front surface portion 2 are exposed from both side ends of the back surface portion 3. FIG. 9(C) shows a state where the uneven patterns of the connecting flaps 4 on both sides of the front surface portion 2 have been crushed in the crushing step S5. FIG. 9(D) shows a state where glue 8 is applied to both side end sides of the surface of the back surface portion 3 in the glue application step S6. FIG. 9(E) shows a state where the connecting flaps 4 on both sides of the front surface portion 2 are folded onto the upper surface of the back surface portion 3 and bonded in the bonding step S7. In this way, an envelope-type package 1 having cushioning properties on the inner surface can be obtained by using a material sheet 1X having an uneven pattern on one side that has been previously cut into the unfolded shape of the envelope.

[0043] Next, the effects of the present embodiment will be described.

[0044] In the manufacturing method of the envelope-type package of the present embodiment, a cardboard of single-sided corrugated board as a material sheet having an uneven pattern is provided such that a rectangular back surface portion 3 is continuously provided at the lower end edge of a rectangular front surface portion 2 via a first folding line a1, and connecting flaps 4 are continuously provided at both side edges of the front surface portion 2 via a second folding line a2. The material sheet 1X having the developed shape of the envelope is cut into the developed shape of the envelope. After folding the front surface portion 2 toward the back surface portion 3 so that the uneven pattern of the material sheet 1X having the developed shape of the envelope faces inward, the uneven pattern of the connecting flaps 4 on both sides of the front surface portion 2 is crushed. Then, glue is applied to a predetermined position on the upper surface of the connecting flap 4 whose uneven pattern has been crushed, and the connecting flap 4 to which the glue has been applied is folded onto the upper surface of the back surface portion 3 and adhered. By crushing the uneven pattern of the connecting flap 4 immediately before applying the glue, it is possible to suppress the crushed uneven pattern from returning to its original shape. Therefore, a decrease in the adhesion area between the connecting flap 4 and the back surface portion 3 can be avoided, and a decrease in the adhesion strength can be prevented. Also, when forming the envelope shape, it can be made easier to fold. Also, the applied glue spreads easily, and an inexpensive vinyl acetate-based adhesive can be used. Furthermore, since the front surface portion 2 is folded toward the back surface portion 3 so that the uneven pattern of the material sheet 1X faces inward, the inner surface of the envelope-type package 1 can be provided with cushioning properties.

[0045] Also, in the manufacturing method of the envelope-type package of the present embodiment, it becomes possible to print information including a barcode on the upper surface of a material sheet 1X having an uneven pattern on one side while transporting the uneven pattern downward. That is, printing using an inkjet printer becomes easier. Thereby, it becomes possible to print information including different barcodes for each packaging package.

[0046] Therefore, according to the manufacturing method of the envelope-type package of the present embodiment, it is possible to suppress the uneven pattern of the crushed connecting flap 4 from returning to its original shape, prevent the adhesive strength from decreasing, and make it easier to fold when forming the envelope shape. In addition, an inexpensive vinyl acetate-based adhesive can be used. Further, it becomes possible to print information including a barcode on the upper surface of the material sheet 1X having an uneven pattern on one side while transporting the uneven pattern downward. Furthermore, by using the material sheet 1X having an uneven pattern on one side, an envelope-type package 1 having cushioning properties and being environmentally friendly and recyclable at low cost can be obtained.

[0047] Also, in the manufacturing method of the envelope-type package of the present embodiment, in the crushing step, by gradually crushing the uneven pattern of the connecting flap 4, which becomes the adhesive part when forming the envelope shape, in multiple stages, it is possible to surely suppress the crushed uneven pattern from returning to its original shape.

[0048] Therefore, in the manufacturing method of the envelope-type package of the present embodiment, it is possible to surely suppress the uneven pattern crushed in the crushing step S5 from returning to its original shape. Therefore, it is possible to surely avoid a decrease in the adhesive area between the connecting flap 4 and the back surface part 3 and surely prevent a decrease in the adhesive strength.

[0049] For example, in the manufacturing method of the envelope-type package of the present embodiment, in the crushing step S5, the uneven patterns of the connecting flaps 4 on both sides of the folded surface part 2 are gradually crushed by three crushing rollers 41a, 41b, and 41c having different clearances, so as to crush the uneven pattern of the connecting flap 4 immediately before applying the glue. Thus, it is possible to suppress the crushed uneven pattern from returning to its original shape and ensure the adhesive strength of the adhesive part. In addition, multiple crushing processes can be continuously performed in-line, improving the production efficiency.

[0050] Therefore, according to the manufacturing method of the envelope-type package of the present embodiment, it is possible to reliably suppress the crushed uneven pattern from returning to its original shape, ensure the adhesive strength of the adhesive portion, and continuously perform a plurality of crushing processes in-line, thereby improving the production efficiency.

[0051] In addition, the manufacturing method of the envelope-type package of the present embodiment includes a printing step S3 in which information including a barcode 7 is printed on the upper surface of the back surface portion 3 by the printing means 20 installed upstream of the folding step S4. Thus, it is possible to print information including the barcode 7 on the upper surface of the material sheet 1X having an uneven pattern on one side while transporting the material sheet 1X with the uneven pattern facing downward.

[0052] Therefore, in the manufacturing method of the envelope-type package of the present embodiment, it is possible to print information including a different barcode 7 for each envelope-type package, and printing with an inkjet printer becomes easy.

[0053] In the above-described embodiment, an example having a printing step S3 in which information including a barcode is printed on the upper surface of the material sheet 1X while transporting the material sheet 1X with the uneven pattern facing downward has been described. However, the present invention is not limited to this. For example, the information including the barcode may be printed in advance before being transported by the transport means 10.

[0054] In the above-described embodiment, an example in which a pair of pressing rollers 32a is used as the pressing means 32 in the folding step S4 has been described. However, the present invention is not limited to this. In the bending portion 30, other configurations that can lower the surface portion 2 obliquely downward in the traveling direction while pressing it from above may be used.

[0055] In the above-described embodiment, an example in which an air outlet 35 as an auxiliary means for pressing the front end of the surface portion 2 downward and causing it to enter the folding guide portion 31 is provided in the folding step S4 has been described. However, the present invention is not limited to this. For example, the air outlet 35 may not be provided.

[0056] Also, in the above-described embodiment, in the folding step S4, an example in which the back surface portion 3 is linearly advanced horizontally and the lifting means 33 for ensuring the conveying force is composed of a pair of lifting rollers 33a, a rotating arm 33b, and an air cylinder 33c has been described. However, the present invention is not limited to this. Other configurations may be used.

[0057] Also, in the above-described embodiment, in the crushing step S5, an example in which the uneven pattern of the connecting flap 4 is gradually crushed by three crushing rollers 41a, 41b, and 41c has been described. However, the present invention is not limited to this. For example, other configurations such as a press mechanism may be used to crush the uneven pattern of the connecting flap 4.

[0058] Also, in the above-described embodiment, in the crushing step S5, an example in which the uneven pattern on substantially the entire surface of the connecting flap 4 is crushed has been described. However, the present invention is not limited to this. For example, only the uneven pattern on a part of the connecting flap 4 may be crushed.

[0059] Also, in the above-described embodiment, an example in which the unsealing zipper 6 is formed on the upper end flap portion 5 of the envelope-type package 1 has been described. However, the present invention is not limited to this. For example, the unsealing zipper 6 may not be provided.

[0060] Furthermore, in the above-described embodiment, as the material sheet having the uneven pattern on one side, a corrugated cardboard having a wavy uneven pattern has been described as an example. However, the present invention is not limited to this. Cardboard or a thin synthetic resin plate that is embossed and has uneven patterns such as hemispherical shapes and triangular shapes on one side may also be used.

[0061] Also, an example in which the steps of the single-sided corrugated cardboard are arranged in the length direction (the left-right direction in FIG. 3) has been described. However, the present invention is not limited to this. For example, the steps of the single-sided corrugated cardboard may be arranged in a direction orthogonal to the conveying direction (the up-down direction in FIG. 3).

[0062] The present invention is not limited to the above-described embodiments, and various forms with design changes are included in the technical scope without departing from the gist of the invention described in the claims.

Explanation of Reference Numerals

[0063] 1 Envelope-type Package 1X, 1Y Material Sheet 2 Surface Portion 3 Back Portion 4 Connecting Flap 5 Upper End Flap Portion 6 Unsealing Zipper 7 Barcode 8 Adhesive 10 Conveyor 11 Upper Conveyor Belt 12a, 12b Lower Conveyor Belt 13 Pressing Roller 20 Inkjet Printer 30 Bending Portion 31 Bending Guide Portion 31a Guide Plate 31b Guide Member 31c Stopper 32 Pressing Means 32a Pressing Roller 33 Lifting Means 33a Lifting Roller 33b Rotating Arm 33c Air Cylinder 34 Timing Sensor 35 Air Outlet 40 Crushing Means 41a, 41b, 41c Crushing Rollers 42a, 42b, 42c Support Rollers 43a, 43b, 43c Adjusting Screws 50 Adhesive Discharge Nozzle 60 Folding Means a1 First Fold Line a2 Second Fold Line a3 Third Fold Line

Claims

1. A method for manufacturing an envelope-type package using a material sheet having an uneven pattern on one side, comprising: a conveying step of conveying the material sheet, which has been cut into the unfolded shape of an envelope in which a rectangular back surface portion is continuously provided via a fold line at the lower edge of a rectangular front surface portion, and connecting flaps are continuously provided via fold lines at both side edges of the front surface portion, horizontally with the uneven pattern facing downward to a downstream process; a folding step of guiding the front surface portion downward while conveying the material sheet by the conveying step so that the uneven pattern of the material sheet faces inward, and folding it toward the back surface portion; a crushing step of crushing the uneven pattern of the connecting flaps on both sides of the front surface portion folded in the folding step; an adhesive application step of applying adhesive to a predetermined position on the upper surface of the connecting flap whose uneven pattern has been crushed in the crushing step; and an adhesion step of folding the connecting flaps on both sides of the front surface portion onto the upper surface of the back surface portion and adhering them to the back surface portion. A method for manufacturing an envelope-type package, characterized by comprising these steps.

2. In the method for manufacturing an envelope-type package according to Claim 1, in the crushing step, the uneven pattern of the connecting flap is crushed step by step in multiple stages. A method for manufacturing an envelope-type package, characterized by this.

3. In the method for manufacturing an envelope-type package according to Claim 2, in the crushing step, the uneven pattern of the connecting flaps on both sides of the front surface portion folded by three crushing rollers with different clearances is crushed step by step. A method for manufacturing an envelope-type package, characterized by this.

4. In the method for manufacturing an envelope-type package according to any one of Claims 1 to 3, the method further comprises a printing step of printing information including a barcode on the upper surface of the back surface portion by printing means installed upstream of the folding step. A method for manufacturing an envelope-type package, characterized by this.

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