A method for forming a cigarette package having an outer PE-laminated layer and an inner PE-laminated layer

Abstract

The application discloses a forming method of a cigarette packaging box, which comprises the following steps: S1, cutting a packaging paper according to an unfolding drawing of the packaging box, and setting a crease on the packaging paper; S2, forming a cigarette taking area (1) and a flip cover (9) on a top cover (2) and a front side wall (3); S3, changing the packaging box from an unfolding state to a box body state; and S4, through an ultrasonic welding method, making PE spraying film melt and adhere under the condition of pressure and heat, so as to connect the front side wall (3), a rear side wall (4), a left side wall (5), a right side wall (6) and a bottom plate (7). The outermost layer and the innermost layer of the packaging paper are respectively sprayed with an outer PE spraying film layer and an inner PE spraying film layer to form double-sided spraying film paper, so that the sealing property and the barrier property of the paper are effectively improved. Meanwhile, the double-sided spraying film packaging paper can be connected through the ultrasonic heat sealing mode, so that the gap at the joint and the corner of the packaging box can be effectively eliminated, the sealing property of the packaging box is further improved, and the humidifying and aroma preserving effect of the packaging box on the cigarette is improved.

Description

Technical Field

[0001] This invention relates to the field of cigarette packaging technology, specifically to a high-moisture and aroma-preserving cigarette packaging paper and box, and more specifically to a method for forming a cigarette packaging box. Background Technology

[0002] Current hard-pack cigarette packaging typically consists of a cardboard box with a lid, lined with inner paper. This inner paper not only wraps and secures the shape of the cigarettes but also provides excellent barrier properties against gases and moisture, offering multiple layers of protection during storage, including moisture prevention, humidity retention, aroma preservation, and light shielding. This significantly reduces the risk of mold growth due to dampness and aroma loss. Furthermore, it's worth noting that the BOPP film used in cigarette packaging also plays a crucial role in moisture prevention, humidity retention, and aroma preservation before being torn open, ensuring the longevity and excellence of the cigarette quality. However, current cigarette packaging still has the following problems:

[0003] First, as the BOPP film and inner lining paper of the cigarette box are torn during use, the cigarettes inside are in a state of being partially wrapped by the inner lining paper. The cigarettes lose a strong barrier to isolate them from the air. After being opened and closed multiple times, the aroma and moisture of the cigarettes will change with the changes in the humidity of the external environment, which will reduce the quality of the cigarettes and greatly reduce the smoking experience. In dry climates, the moisture and aroma of the cigarettes are easy to evaporate, resulting in greater irritation and a noticeable dryness when smoking. In humid conditions, the tobacco will absorb moisture from the surrounding air and is prone to mold, causing the smoke to become stuffy.

[0004] Secondly, existing cigarette liner paper generally uses aluminized liner paper produced by composite, transfer, or direct plating processes, or printed liner paper. During packaging, the embossing process damages the base paper and aluminum layer structure of such liner paper. Premature damage to the liner paper structure leads to the following problems: 1. Reduced moisture resistance: The aluminum layer structure of the liner paper is a key component of its moisture resistance. Once damaged, its ability to block moisture and humidity is reduced, making cigarettes susceptible to moisture during storage and transportation, thus affecting the taste and quality of the cigarettes. 2. Weakened aroma retention: Damage to the aluminum layer structure may also affect the aroma retention of the liner paper, making the aroma of the cigarettes easily dissipate and unable to maintain its original aroma characteristics for a long time. 3. Reduced mechanical strength: If the base paper structure is damaged during the embossing process, it may reduce the mechanical strength of the liner paper, making it more susceptible to damage or deformation during packaging and transportation, thus affecting the overall aesthetics and practicality of the packaging. 4. Shortened shelf life: Due to the reduced moisture-proof and aroma-preserving properties, the shelf life of cigarettes may be shortened accordingly, increasing the risks of storage and transportation.

[0005] Finally, existing liner paper in cigarette packaging is typically formed by folding. However, this folding method can cause a series of problems during operation, especially regarding the treatment of the folded edges. Because it is often difficult to achieve a perfect fit at the folds, large gaps form in these areas. These gaps not only affect the overall aesthetics of the liner paper, but more importantly, they weaken its sealing performance. Reduced sealing directly impacts the liner paper's moisture retention and aroma preservation effects.

[0006] Therefore, in response to the current problems with the combination packaging of trademark paper boxes, inner lining paper and BOPP film, it is necessary to develop a new type of packaging paper and packaging box that combines the shaping function of trademark paper boxes and inner lining paper with the moisture-proof, moisture-retaining and fragrance-preserving functions of BOPP film to form a material with better sealing performance. This material can simultaneously have the functions of shaping, sealing, moisture-proofing, moisture-retaining, fragrance preservation and light blocking.

[0007] To address the above problems, this invention is proposed. Summary of the Invention

[0008] To overcome the problems existing in the background technology, this invention proposes a high-moisture and aroma-preserving cigarette packaging paper and box. The packaging paper is composed of an outer PE coating layer, a white cardboard layer, an outer composite adhesive layer, an outer PET layer, a release layer, a self-adhesive layer, an inner PET layer, an inner composite adhesive layer, a coated paper layer, and an inner PE coating layer. By coating the outermost and innermost layers of the packaging paper with an outer PE coating layer and an inner PE coating layer respectively, forming a double-sided coated paper, and using a high-barrier PET layer as the substrate, the airtightness of the paper is effectively improved. Simultaneously, the double-sided coated packaging paper can be bonded using ultrasonic heat sealing. That is, the heat generated when ultrasound vibrates on the surface of the PE coating layer softens the surface of the PE coating layer, and then it is pressed together under high pressure to achieve a seal. The packaging box has a fast forming speed and high forming efficiency, effectively eliminating gaps at the interface and corners of the packaging box, thereby effectively improving the sealing performance of the packaging box and enhancing the moisture and aroma preservation effect of the packaging box for the cigarettes. An opening is provided at the cigarette dispensing spout of the packaging box, and a tear-off portion matching the adhesive part is provided on the flip-top. This allows for easy opening of the packaging box while effectively preventing the cigarette from contacting the outside air during the process of opening and closing the box. This effectively maintains the stability of the cigarette's moisture and prevents the loss of aroma components, thus improving the consumer's smoking experience. The bottom of the packaging box of this invention has a pressure relief device to prevent the entire packaging box from bulging due to the improved sealing.

[0009] The first aspect of the present invention provides a cigarette packaging paper, which includes an inner portion, an outer portion, and a release layer 105 and an adhesive layer 106 between the inner portion and the outer portion;

[0010] The outer portion comprises, in sequence: an outer PE (polyethylene) coating layer 101, an outer paper layer 102, an outer composite adhesive layer 103, and an outer PET (polyethylene terephthalate) layer 104;

[0011] The inner part includes, in sequence: an inner PET layer 107, an inner composite adhesive layer 108, an inner paper layer 109, and an inner PE coating layer 110;

[0012] The release layer 105 is close to the outer PET layer 104, while the self-adhesive layer 106 is close to the inner PET layer 107.

[0013] Preferably, the basis weight of the outer PE coating layer is 25-28 g / m³. 3 Thickness 0.026-0.030mm;

[0014] The inner PE coating layer has a basis weight of 14-16 g / m³. 3 Thickness 0.014-0.016mm;

[0015] The outer paper layer 102 is a white cardboard layer or a coated paper layer, and the weight of the outer paper layer 102 is 140-160 g / m². 3 ,

[0016] Thickness 0.130-0.14mm; preferably, the outer paper layer 102 is a white cardboard layer;

[0017] The inner paper layer 109 is coated paper, and the weight of the inner paper layer 109 is 80-100 g / m². 3 Thickness 0.08-0.1mm;

[0018] The thickness of the outer PET layer and the inner PET layer is 0.01-0.012 mm (10-12 μm).

[0019] The release layer 105 is selected from, but not limited to, PTFE (polytetrafluoroethylene) and PE (polyethylene) coatings, with a thickness of 0.002-0.004 mm;

[0020] The self-adhesive layer 106 is selected from, but not limited to, PVC (polyvinyl chloride) self-adhesive and PET (polyethylene terephthalate) self-adhesive, and has a thickness of 0.006-0.007 mm;

[0021] The outer composite adhesive layer 103 and the inner composite adhesive layer 108 are selected from, but not limited to, polyurethane adhesive and epoxy resin adhesive, and have a thickness of 0.003-0.005 mm.

[0022] The outer PE coating layer 101 and the inner PE coating layer 110 are selected from polyethylene.

[0023] In other words, the packaging paper of this invention comprises a total of ten layers, from the outside to the inside: an outer PE coating layer 101, an outer paper layer 102, an outer composite adhesive layer 103, an outer PET layer 104, a release layer 105, a self-adhesive layer 106, an inner PET layer 107, an inner composite adhesive layer 108, an inner paper layer 109, and an inner PE coating layer 110. Here, "outer" and "inner" refer to the packaging box formed by the packaging paper in its box-like state. When the packaging box is in its box-like state, the cigarette is placed inside the internal cavity of the packaging box. The side of the packaging box closest to the cigarette is the innermost layer of the packaging paper, and the side of the packaging box furthest from the cigarette is the outermost layer of the packaging paper.

[0024] The purpose of selecting and positioning the various layers of material in the packaging paper of this invention is as follows:

[0025] Both white cardboard and coated paper form the structural framework of packaging materials, ensuring the shape and stiffness of the finished cigarette pack. White cardboard, adjacent to the outer PE coating layer, has greater thickness and hardness, and better abrasion resistance, making it a superior outer substrate. Coated paper, adjacent to the inner PE coating layer, not only supports the inner PE coating layer but also helps the inner PET layer recover its original shape after repeated opening and closing.

[0026] The PET layer has good physical and mechanical properties, including good barrier properties (especially oxygen barrier properties), creep resistance, fatigue resistance, abrasion resistance, thermal stability, and dimensional stability. It also has good electrical insulation at high temperatures and high frequencies, which helps maintain the original shape during ultrasonic welding and helps the cigarette pack maintain its original shape after repeated opening and closing. In addition, the smooth surface of the PET layer facilitates the adhesion of the release layer and the self-adhesive layer. Therefore, the outer PET layer and the inner PET layer can serve as carrier materials for the release layer and the self-adhesive layer, and at the same time, they are also the matrix of the overall packaging material.

[0027] The inner and outer PET layers are coated with a composite adhesive layer, which is mainly used for bonding with the paper. That is, the outer composite adhesive layer is used to bond the white cardboard layer and the outer PET layer, and the inner composite adhesive layer is used to bond the coated paper layer and the inner PET layer.

[0028] The inner and outer portions are separated by a release layer and a self-adhesive layer, with the self-adhesive layer being more adhesive towards the inner portion. The release layer is a release agent coating, primarily serving to isolate sticky substances, providing a smooth film surface and effectively preventing adhesive migration. Furthermore, the release layer ensures that the torn portion can be repeatedly adhered to the self-adhesive layer on the adhesive portion. In this application, the release layer separates the self-adhesive layer from the outer PET layer. The release layer is adjacent to the outer PET layer, while the self-adhesive layer is adjacent to the inner PET layer.

[0029] The innermost and outermost layers of the packaging paper are coated with PE film. PE film possesses strong water and oil resistance, as well as high barrier properties, maintaining the stability of the packaging paper while also being able to melt and bond under ultrasonic welding conditions, resulting in a good seal at the joints. This synergizes with the ultrasonic welding used in the packaging box assembly method of this invention. Furthermore, the outer PE film is thicker than the inner PE film to meet sealing requirements and provide good barrier performance; the inner PE film effectively protects the internal cigarettes from the influence of the outer paper and the external environment.

[0030] A second aspect of the present invention provides a cigarette packaging box using the cigarette packaging paper described in the first aspect of the present invention. When the packaging box is in the box body state, the packaging box includes: a top cover 2, a front side wall 3, a rear side wall 4, a left side wall 5, a right side wall 6, and a bottom plate 7.

[0031] The top cover 2 and the front side wall 3 are provided with a communicating opening as a cigarette taking area 1 of the packaging box, and the cigarette taking area 1 is provided with a flip cover 9 that matches the opening on the top cover 2 and the front side wall 3.

[0032] The flip cover 9 is rotatably connected to the upper end of the rear side wall 4 through a crease, and the flip cover 9 is provided with a crease corresponding to the crease between the top cover 2 and the front side wall 3;

[0033] After the flip cover 9 is reset, the packaging box is in a cuboid state, and the cigarette stick is placed in the internal cavity formed by the packaging box; the innermost layer of the packaging paper is on the side of the packaging box closer to the cigarette stick, and the innermost layer of the packaging paper is an inner PE coating layer 110; the outermost layer of the packaging paper is on the side of the packaging box away from the cigarette stick, and the outermost layer of the packaging paper is an outer PE coating layer 101.

[0034] Preferably, the top cover 2 and the front sidewall 3 of the packaging box at the cigarette taking area 1 extend in the direction of the cigarette taking area 1 with an adhesive portion 201, and the packaging paper at the adhesive portion 201 includes a self-adhesive layer 106, an inner PET layer 107, an inner composite adhesive layer 108, an inner paper layer 109 and an inner PE coating layer 110.

[0035] The flip cover 9 is provided with a tear-off portion 901 that matches the shape of the adhesive portion 201. The packaging paper at the tear-off portion 901 includes an outer PE coating layer 101, an outer paper layer 102, an outer composite adhesive layer 103, an outer PET layer 104, and a release layer 105.

[0036] The smoke extraction area 1 is located inside the adhesive part 201, forming a smoke extraction port 202;

[0037] The adhesive part 201 is adjacent to the tear-off part 901 and is the self-adhesive layer 106. The tear-off part 901 is adjacent to the adhesive part 201 and is the release layer 105. The repeated pasting and tearing of the release layer 105 and the self-adhesive layer 106 realizes the repeated pasting and tearing of the tear-off part 901 and the adhesive part 201, thereby realizing the repeated pasting and tearing of the flip cover 9 and the cigarette taking area 1, and further realizing the closing and exposure of the cigarette taking port 202.

[0038] In other words, to facilitate the removal of the cigarette, an opening is provided at the connection between the top cover 2 and the front side wall 3. Before the opening is provided, both the top cover 2 and the front side wall 3 are ten-layer packaging paper as described in this invention. A portion of the top cover 2 and the front side wall 3 is cut open with a cutter to form a cigarette-removing area 1 and a flip cover 9. The cigarette-removing area 1 has an adhesive portion 201, and the flip cover 9 has a tear-off portion 901. The adhesive portion 201 near the tear-off portion 901 is a self-adhesive layer 106, and the tear-off portion 901 near the adhesive portion 201 is the release layer 105. Figure 6 As shown, firstly, the cutter cuts only down to the release layer 105, dividing the top cover 2 and the front sidewall 3 into the cigarette-taking area 1 with the adhesive portion 201 and the flip cover 9 with the tear portion 901. The adhesive portion 201 is the inner layer of the packaging paper and the self-adhesive layer 106, and the tear portion 901 is the outer layer of the packaging paper and the release layer 105. Then, the cutter cuts all the layers of the packaging paper again, forming the cigarette-taking opening 202. All ten layers of the packaging paper at the cigarette-taking opening 202 are located on the flip cover 9. The specific cutting depth is adjusted according to the different thicknesses of each layer in the actual situation.

[0039] Preferably, the orthographic projection of the smoke outlet 202 onto the top cover 2 and the front sidewall 3 is a rectangle, and the rectangle includes a right-angled rectangle or a chamfered rectangle.

[0040] Preferably, the shapes of the smoke extraction area 1 and the edges of the flip cover 9 can be arbitrarily selected according to the actual situation. Preferably, the shapes of the smoke extraction area 1 and the edges of the flip cover 9 are two parallel straight lines on the top cover 2, and are arc-shaped, trapezoidal, or a special shape combining straight lines and curves on the front side wall 3. In addition, they can be any shape that is easy to cut.

[0041] Preferably, the base plate 7 has a pressure relief device, which includes a pressure relief hole 701 and a pressure relief plate 702 covering the pressure relief hole 701;

[0042] The pressure relief hole 701 has a diameter of 0.7-0.8 cm; the pressure relief plate 702 is made of latex.

[0043] The method for attaching the pressure relief pad 702 is as follows: A small hole is designed in the middle of the bottom packaging material. The pressure relief pad is applied to the back using an adhesive application method with heating to cover the small hole. The outer ring of the pressure relief pad has a circular adhesive application area, which is then attached to the inside of the circular hole at the bottom of the packaging box. For example... Figure 12-13 Because the pressure relief sheet 702 deforms more easily under stress than the packaging paper, when the gas pressure inside the packaging increases, the pressure concentrates in the area of ​​the pressure relief sheet 702, causing it to bulge. This prevents the entire packaging box from bulging. Since the pressure relief sheet 702 is located at the bottom of the packaging box, it is less noticeable to consumers, minimizing the risk of bulging. Furthermore, because the pressure relief sheet 702 can withstand greater deformation than the packaging material, it is less prone to breakage.

[0044] The unfolded state of the packaging box includes two situations. In the first situation, the bottom plate 7 is connected to the rear side wall 4, and the bottom plate 7 is attached to the front side wall 3, rear side wall 4, and right side wall 6 through a folding plate. In the second situation, the bottom plate 7 is separate, and the bottom plate 7 is attached to the front side wall 3, rear side wall 4, left side wall 5, and right side wall 6 through a folding plate.

[0045] Preferably, when the packaging box is in the unfolded state, the bottom plate 7 is connected to the rear side wall 4. The packaging box includes: a top cover 2, a front side wall 3, a rear side wall 4, a left side wall 5, and a right side wall 6 extending vertically in the forward, backward, left, and right directions respectively with the top cover 2 as the center, and a bottom plate 7 extending vertically from the rear side wall 4 away from the top cover 2.

[0046] Creases are provided at the connections between the top cover 2 and the front sidewall 3, the rear sidewall 4, the left sidewall 5, and the right sidewall 6. A crease is also provided at the connection between the rear sidewall 4 and the bottom plate 7. The left and right sides of the front sidewall 3 and the rear sidewall 4 extend outwards to form first folded plates 8. A crease at a 45° angle to the left sidewall 5 is provided on the left first folded plate 8, and a crease at a 45° angle to the right sidewall 6 is provided on the right first folded plate 8. The ends of the front sidewall 3, the left sidewall 5, and the right sidewall 6 away from the top cover 2 extend outwards to form second folded plates 10. The front end, left end, and right end of the bottom plate 7 extend outwards to form third folded plates 11. The left and right third folded plates 11 are the same width as the bottom plate 7 and are just not connected to the first folded plates 8 on the left and right sides of the rear sidewall 4.

[0047] When the packaging box is in the box state, the first folding plate 8 on the left side is attached to the left side wall 5, and the first folding plate 8 on the right side is attached to the right side wall 6; the second folding plate 10 is folded inward to be attached to the bottom plate 7, and the third folding plate 11 is folded upward to be attached to the front side wall 3, the left side wall 5, and the right side wall 6.

[0048] Preferably, when the packaging box is in the unfolded state, the bottom plate 7 is separate, and the packaging box includes: a top cover 2, a bottom plate 7, and a front side wall 3, a rear side wall 4, a left side wall 5, and a right side wall 6 extending vertically in the forward, backward, left and right directions with the top cover 2 as the center.

[0049] Creases are provided at the connection points of the top cover 2 with the front sidewall 3, the rear sidewall 4, the left sidewall 5, and the right sidewall 6. The left and right sides of the front sidewall 3 and the rear sidewall 4 extend outward to form first folded plates 8. The front and rear sides of the left sidewall 5 and the right sidewall 6 extend outward to form fourth folded plates 12. The first folded plate 8 on the left side has a crease at a 45° angle to the left sidewall 5, and the first folded plate 8 on the right side has a crease at a 45° angle to the right sidewall 6. The four sides of the bottom plate 7 extend outward to form fifth folded plates 13, and there is a crease between the bottom plate 7 and the fifth folded plate 13.

[0050] When the packaging box is in the box state, the first folding plate 8 on the left side is attached to the fourth folding plate 12 on the left side, and the first folding plate 8 on the right side is attached to the fourth folding plate 12 on the right side. The fifth folding plate 13 on the front side is attached to the front side wall 3, the fifth folding plate 13 on the rear side is attached to the rear side wall 4, the fifth folding plate 13 on the left side is attached to the left side wall 5, and the fifth folding plate 13 on the right side is attached to the right side wall 6.

[0051] A third aspect of the present invention provides a method for forming a cigarette packaging box as described in the second aspect of the present invention, comprising the following steps:

[0052] S1, cut the wrapping paper according to the unfolded diagram of the packaging box and make creases on the wrapping paper; the unfolded state of the packaging box includes two situations. The first situation is that the bottom plate 7 is connected to the rear side wall 4, and the bottom plate 7 is attached to the front side wall 3, rear side wall 4, and right side wall 6 through folding plates. The second situation is that the bottom plate 7 is separate, and the bottom plate 7 is attached to the front side wall 3, rear side wall 4, left side wall 5, and right side wall 6 through folding plates. In this step, the wrapping paper is cut according to the actual situation.

[0053] S2, the cigarette-taking area 1 and the flip-top 9 are formed on the top cover 2 and the front side wall 3; that is, in order to facilitate the removal of the cigarette, an opening is provided at the connection between the top cover 2 and the front side wall 3. Before the opening is provided, the top cover 2 and the front side wall 3 are both ten-layer packaging paper as described in this invention. A portion of the top cover 2 and the front side wall 3 are cut open with a cutter to form the cigarette-taking area 1 and the flip-top 9. Figure 6 As shown, firstly, the cutter cuts only to the release layer 105 in terms of layers, dividing the top cover 2 and the front sidewall 3 into the cigarette-taking area 1 with the adhesive part 201 and the flip cover 9 with the tear part 901. The adhesive part 201 is the inner layer of the packaging paper and the self-adhesive layer 106, and the tear part 901 is the outer layer of the packaging paper and the release layer 105. Then, the cutter cuts all the layers of the packaging paper again to form the cigarette-taking opening 202. All ten layers of the packaging paper at the cigarette-taking opening 202 are located on the flip cover 9.

[0054] S3, change the packaging box from the unfolded state to the box state; usually, the packaging box is changed from the unfolded state to the box state by folding.

[0055] S4. Using ultrasonic welding, the PE membrane is melted and bonded under pressure and heat, thereby bonding the joints of the front sidewall 3, rear sidewall 4, left sidewall 5, right sidewall 6, and base plate 7. Different unfolded diagrams will result in different joints after folding; in this step, the existing joints are bonded according to the actual situation.

[0056] Preferably, the conditions for ultrasonic welding in step S2 are: ultrasonic welding frequency of 30-40kHz, more preferably 40kHz, pressure increase of 0.5-0.8MPa, more preferably 0.8MPa, amplitude of 1mm, and holding time of 10s.

[0057] Preferably, the bonding method is ultrasonic welding. Under the high-frequency vibration of the ultrasonic welding machine, a certain amount of heat is generated, which causes the PE coating layer to melt and adhere. Then, pressure is applied to make the bonding surface of the box more secure.

[0058] To match the high sealing and high barrier properties of the packaging paper in this invention, the die-cutting size of the packaging box can be adjusted according to the actual situation.

[0059] Compared with the prior art, the present invention has the following beneficial effects:

[0060] 1. The packaging paper of this invention comprises, from the outside in: an outer PE coating layer, a white cardboard layer, an outer composite adhesive layer, an outer PET layer, a release layer, a self-adhesive layer, an inner PET layer, an inner composite adhesive layer, a coated paper layer, and an inner PE coating layer. By coating the outermost and innermost layers with outer and inner PE coating layers respectively, a double-sided coated paper is formed. The high-barrier PET layer serves as the substrate, effectively improving the paper's airtightness. This enhances the packaging paper's sealing, moisture-proofing, moisture retention, aroma preservation, and barrier properties. The white cardboard and coated paper form the structural framework of the packaging material, ensuring the finished cigarette pack's shape, stiffness, and light-blocking effect. The packaging material of this invention can simultaneously provide shaping, sealing, moisture-proofing, moisture retention, aroma preservation, and light-blocking functions.

[0061] 2. Because the inner and outer layers of the packaging paper of this invention are respectively an inner PE coating layer and an outer PE coating layer, after the packaging paper of this invention is folded into a packaging box, the PE coating can be further melted and bonded under pressure and heat by ultrasonic welding. Specifically, the heat generated when the ultrasonic waves vibrate on the surface of the PE coating layer softens the surface of the PE coating layer, and then it is stacked and pressed under high pressure to achieve sealing. The packaging box is formed quickly and efficiently, which can effectively eliminate gaps at the joints and corners of the formed packaging box, thereby effectively improving the sealing performance of the packaging box and improving the moisture retention and aroma preservation effect of the packaging box for cigarettes.

[0062] 3. To facilitate the removal of the cigarette, the present invention provides an opening at the connection between the top cover 2 and the front side wall 3. Before the opening is provided, the top cover 2 and the front side wall 3 are both made of ten layers of packaging paper as described in the present invention. A portion of the top cover 2 and the front side wall 3 is cut open with a cutter to form a cigarette-removing area 1 and a flip cover 9. The cigarette-removing area 1 has an adhesive part 201, and the flip cover 9 has a tearing part 901. The adhesive part 201 is a self-adhesive layer 106 on the side near the tearing part 901, and the tearing part 901 is a release layer 105 on the side near the adhesive part 201. The repeated pasting and tearing of the release layer 105 and the self-adhesive layer 106 achieves the repeated pasting and tearing of the tearing part 901 and the adhesive part 201, thereby achieving the repeated pasting and tearing of the flip cover 9 and the cigarette-removing area 1, and further achieving the closure and exposure of the cigarette-removing opening 202. This invention provides an adhesive part at the cigarette dispensing opening of the packaging box and a tear-off part on the flip cover that matches the adhesive part. This allows the packaging box to be opened frequently while effectively preventing the cigarette from coming into contact with the outside air during the process of closing the box after it has been opened. This effectively maintains the moisture content of the cigarette and prevents the loss of the cigarette's aroma components, thus improving the consumer's smoking experience.

[0063] 4. While the packaging paper material structure and box forming method of this invention do improve the sealing performance of the packaging box, they also present new problems. Due to the good sealing performance of the cigarette packaging box, in high-altitude areas, the packaging box may bulge due to the influence of external air pressure. This is because the air pressure is lower at high altitudes, resulting in a relatively higher internal gas pressure, causing the packaging material to expand and deform under internal pressure, or even rupture. This not only affects the aesthetics of the packaging but may also expose the cigarettes to the outside environment. If the cigarettes are exposed, they may be affected by external environmental factors such as humidity, temperature, and oxygen, leading to a decline in product quality and damage to taste and quality. This effect may be more pronounced, especially in high-altitude areas due to the unique climatic conditions. To avoid this phenomenon, the packaging box of the present invention has a pressure relief device at the bottom. Specifically, a pressure relief hole 701 is formed in the bottom material of the box, and a pressure relief sheet 702 is covered on the pressure relief hole 701. Since the pressure relief sheet 702 is more prone to deformation under stress than the packaging paper, when the gas pressure inside the packaging increases, the pressure will concentrate in the area of ​​the pressure relief sheet 702, causing the pressure relief sheet 702 to bulge, thereby avoiding the problem of the entire packaging box bulging. Furthermore, since the pressure relief sheet 702 is located at the bottom of the packaging box, it is relatively less noticeable to consumers, minimizing the problem of packaging box bulging. In addition, because the pressure relief sheet 702 can withstand greater deformation than the packaging material, it is less likely to break. Attached Figure Description

[0064] Figure 1 This is a schematic diagram of the packaging paper structure of the present invention;

[0065] Figure 2 This is a schematic diagram of the unfolded state of the packaging box in Example 1;

[0066] Figure 3 This is a schematic diagram of the packaging box in the open state in Example 1;

[0067] Figure 4 This is a schematic diagram of the packaging box in the closed state in Example 1;

[0068] Figure 5 This is a schematic diagram of the packaging paper structure at the cigarette dispensing port in Example 1;

[0069] Figure 6 This is a schematic diagram of the unfolded state of the packaging box in Example 2;

[0070] Figure 7 This is a schematic diagram of the packaging box in the open state in Example 2;

[0071] Figure 8 This is a schematic diagram of the packaging box in the closed state in Example 2;

[0072] Figure 9 This is a schematic diagram of the unfolded state of the packaging box in Example 3;

[0073] Figure 10 This is a schematic diagram of the packaging box in the open state in Example 3;

[0074] Figure 11 This is a schematic diagram of the packaging box in the closed state in Example 3;

[0075] Figure 12 This is a schematic diagram of the base plate structure with pressure relief plates of the present invention;

[0076] Figure 13 This is a schematic diagram illustrating the pressure relief principle of the base plate with pressure relief pads according to the present invention;

[0077] The names of the figures in the figure description are as follows:

[0078] 1-Smoke collection area, 2-Top cover, 3-Front side wall, 4-Rear side wall, 5-Left side wall, 6-Right side wall, 7-Bottom plate, 8-First folding plate, 9-Flip cover, 10-Second folding plate, 11-Third folding plate, 12-Fourth folding plate, 13-Fifth folding plate;

[0079] 101-Outer PE coating layer, 102-White cardboard layer, 103-Outer composite adhesive layer, 104-Outer PET layer, 105-Release layer, 106-Self-adhesive layer, 107-Inner PET layer, 108-Inner composite adhesive layer, 109-Coated paper layer, 110-Inner PE coating layer;

[0080] 201 - Adhesive part, 202 - Smoke outlet;

[0081] 701 - Pressure relief hole, 702 - Pressure relief plate;

[0082] 901 - Tear-off section. Detailed Implementation

[0083] The present invention will now be described in further detail with reference to the embodiments.

[0084] Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed in accordance with the techniques or conditions described in the literature in the field or according to the product instructions. Materials or equipment whose manufacturers are not specified are all conventional products that can be obtained by purchase.

[0085] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” to another element, it can be directly connected to the other element, or there may be an intermediate element. Furthermore, the term “connected” as used herein can include wireless connections.

[0086] In the description of this invention, unless otherwise stated, "a plurality of" means two or more. The terms "inner," "upper," "lower," etc., indicate the orientation or state relationship based on the orientation or state relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0087] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0088] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0089] The following embodiments of the present invention utilize packaging paper composed of an outer PE coating layer, a white cardboard layer, a composite adhesive layer, a PET layer, a release layer, a self-adhesive layer, a PET layer, a composite adhesive layer, a coated paper layer, and an inner PE coating layer. This effectively eliminates gaps at the joints and corners of the resulting packaging box, resulting in good sealing performance and excellent moisture retention and aroma preservation for the cigarettes inside. By providing an adhesive part at the cigarette dispensing opening of the packaging box and a matching tear-off part on the flip-top, the packaging box can be easily opened frequently while effectively preventing the cigarettes from contacting the outside air during the process of opening and closing the box. This effectively maintains the stability of the cigarette's moisture content and prevents the loss of aroma components, thereby improving the consumer's smoking experience.

[0090] Example 1: The unfolded state of the packaging paper is the first case, with the bottom plate 7 connected to the rear side wall 4.

[0091] like Figure 1 As shown, the cigarette packaging paper in this embodiment includes an inner part, an outer part, and a release layer 105 and an adhesive layer 106 between the inner part and the outer part;

[0092] The outer portion comprises, in sequence: an outer PE coating layer 101, an outer paper layer 102, an outer composite adhesive layer 103, and an outer PET layer 104;

[0093] The inner part includes, in sequence: an inner PET layer 107, an inner composite adhesive layer 108, an inner paper layer 109, and an inner PE coating layer 110;

[0094] The release layer 105 is close to the outer PET layer 104, while the self-adhesive layer 106 is close to the inner PET layer 107.

[0095] The outer PE coating layer has a basis weight of 26 g / m³. 3 The thickness is 0.028mm;

[0096] The inner PE coating layer has a basis weight of 14 m³ / m². 3 The thickness is 0.015mm;

[0097] The outer paper layer 102 is a white cardboard layer, and the outer paper layer 102 has a basis weight of 150 g / m². 3 The thickness is 0.135mm;

[0098] The inner paper layer 109 is coated paper, and the weight of the inner paper layer 109 is 100 g / m². 3， The thickness is 0.09mm;

[0099] The thickness of the outer PET layer and the inner PET layer is 12 μm;

[0100] The release layer 105 is selected from PTFE polytetrafluoroethylene coating and has a thickness of 0.002 mm;

[0101] The self-adhesive layer 106 is selected from PVC self-adhesive and has a thickness of 0.007 mm;

[0102] The outer composite adhesive layer 103 and the inner composite adhesive layer 108 are selected from epoxy resin adhesives, with a thickness of 0.003 mm;

[0103] The outer PE coating layer 101 and the inner PE coating layer 110 are selected from polyethylene.

[0104] In other words, the packaging paper of this invention comprises a total of ten layers, from the outside to the inside: an outer PE coating layer 101, an outer paper layer 102, an outer composite adhesive layer 103, an outer PET layer 104, a release layer 105, a self-adhesive layer 106, an inner PET layer 107, an inner composite adhesive layer 108, an inner paper layer 109, and an inner PE coating layer 110. Here, "outer" and "inner" refer to the packaging box formed by the packaging paper in its box-like state. When the packaging box is in its box-like state, the cigarette is placed inside the internal cavity of the packaging box. The side of the packaging box closest to the cigarette is the innermost layer of the packaging paper, and the side of the packaging box furthest from the cigarette is the outermost layer of the packaging paper.

[0105] The purpose of selecting and positioning the various layers of material in the packaging paper of this invention is as follows:

[0106] Both white cardboard and coated paper form the structural framework of packaging materials, ensuring the shape and stiffness of the finished cigarette pack. White cardboard, adjacent to the outer PE coating layer, has greater thickness and hardness, and better abrasion resistance, making it a superior outer substrate. Coated paper, adjacent to the inner PE coating layer, not only supports the inner PE coating layer but also helps the inner PET layer recover its original shape after repeated opening and closing.

[0107] The PET layer has good physical and mechanical properties, with good creep resistance, fatigue resistance, abrasion resistance, thermal stability, and dimensional stability. It also has good electrical insulation at high temperature and high frequency, which helps maintain the original shape during ultrasonic welding and helps the cigarette pack maintain its original shape after repeated opening and closing. In addition, the smooth surface of the PET layer facilitates the adhesion of the release layer and the self-adhesive layer. Therefore, the outer PET layer and the inner PET layer can serve as carrier materials for the release layer and the self-adhesive layer, and at the same time, they are also the matrix of the overall packaging material.

[0108] The inner and outer PET layers are coated with a composite adhesive layer, which is mainly used for bonding with the paper. That is, the outer composite adhesive layer is used to bond the white cardboard layer and the outer PET layer, and the inner composite adhesive layer is used to bond the coated paper layer and the inner PET layer.

[0109] The inner and outer portions are separated by a release layer and a self-adhesive layer, with the self-adhesive layer being more adhesive towards the inner portion. The release layer is a release agent coating, primarily serving to isolate sticky substances, providing a smooth film surface and effectively preventing adhesive migration. Furthermore, the release layer ensures that the torn portion can be repeatedly adhered to the self-adhesive layer on the adhesive portion. In this application, the release layer separates the self-adhesive layer from the outer PET layer. The release layer is adjacent to the outer PET layer, while the self-adhesive layer is adjacent to the inner PET layer.

[0110] The innermost and outermost layers of the packaging paper are coated with PE film. PE film possesses strong water and oil resistance, as well as high barrier properties, maintaining the stability of the packaging paper while also being able to melt and bond under ultrasonic welding conditions, resulting in a good seal at the joints. This synergizes with the ultrasonic welding used in the packaging box assembly method of this invention. Furthermore, the outer PE film is thicker than the inner PE film to meet sealing requirements and provide good barrier performance; the inner PE film effectively protects the internal cigarettes from the influence of the outer paper and the external environment.

[0111] like Figure 2-4 As shown, this embodiment uses the above-mentioned cigarette packaging paper to make a packaging box. When the packaging box is in the box body state, the packaging box includes: top cover 2, front side wall 3, rear side wall 4, left side wall 5, right side wall 6, and bottom plate 7.

[0112] The top cover 2 and the front side wall 3 are provided with a communicating opening as a cigarette taking area 1 of the packaging box, and the cigarette taking area 1 is provided with a flip cover 9 that matches the opening on the top cover 2 and the front side wall 3.

[0113] The flip cover 9 is rotatably connected to the upper end of the rear side wall 4 through a crease, and the flip cover 9 is provided with a crease corresponding to the crease between the top cover 2 and the front side wall 3;

[0114] After the flip cover 9 is reset, the packaging box is in a cuboid state, and the cigarette stick is placed in the internal cavity formed by the packaging box; the innermost layer of the packaging paper is on the side of the packaging box closer to the cigarette stick, and the innermost layer of the packaging paper is an inner PE coating layer 110; the outermost layer of the packaging paper is on the side of the packaging box away from the cigarette stick, and the outermost layer of the packaging paper is an outer PE coating layer 101.

[0115] The top cover 2 and the front sidewall 3 of the packaging box extend toward the cigarette taking area 1 and have an adhesive part 201. The packaging paper at the adhesive part 201 includes a self-adhesive layer 106, an inner PET layer 107, an inner composite adhesive layer 108, an inner paper layer 109, and an inner PE coating layer 110.

[0116] The flip cover 9 is provided with a tear-off portion 901 that matches the shape of the adhesive portion 201. The packaging paper at the tear-off portion 901 includes an outer PE coating layer 101, an outer paper layer 102, an outer composite adhesive layer 103, an outer PET layer 104, and a release layer 105.

[0117] The smoke extraction area 1 is located inside the adhesive part 201, forming a smoke extraction port 202;

[0118] The adhesive part 201 is adjacent to the tear-off part 901 and is the self-adhesive layer 106. The tear-off part 901 is adjacent to the adhesive part 201 and is the release layer 105. The repeated pasting and tearing of the release layer 105 and the self-adhesive layer 106 realizes the repeated pasting and tearing of the tear-off part 901 and the adhesive part 201, thereby realizing the repeated pasting and tearing of the flip cover 9 and the cigarette taking area 1, and further realizing the closing and exposure of the cigarette taking port 202.

[0119] In other words, to facilitate the removal of the cigarette, an opening is provided at the connection between the top cover 2 and the front side wall 3. Before the opening is provided, both the top cover 2 and the front side wall 3 are ten-layer packaging paper as described in this invention. A portion of the top cover 2 and the front side wall 3 is cut open with a cutter to form a cigarette-removing area 1 and a flip cover 9. The cigarette-removing area 1 has an adhesive portion 201, and the flip cover 9 has a tear-off portion 901. The adhesive portion 201 near the tear-off portion 901 is a self-adhesive layer 106, and the tear-off portion 901 near the adhesive portion 201 is the release layer 105. Figure 5 As shown, firstly, the cutter cuts only down to the release layer 105, dividing the top cover 2 and the front sidewall 3 into the cigarette-taking area 1 with the adhesive portion 201 and the flip cover 9 with the tear portion 901. The adhesive portion 201 is the inner layer of the packaging paper and the self-adhesive layer 106, and the tear portion 901 is the outer layer of the packaging paper and the release layer 105. Then, the cutter cuts all the layers of the packaging paper again, forming the cigarette-taking opening 202. All ten layers of the packaging paper at the cigarette-taking opening 202 are located on the flip cover 9. The specific cutting depth is adjusted according to the different thicknesses of each layer in the actual situation. In this embodiment, the cutting depth is approximately 0.17-0.18 mm, so that the thickness of the top cover at the release layer of the tear portion is 0.178 mm. The thickness of the lower part at the self-adhesive layer of the adhesive portion is 0.127 mm.

[0120] The smoke outlet 202 has a right-angled rectangle projected onto both the top cover 2 and the front side wall 3.

[0121] The base plate 7 has a pressure relief device, which includes a pressure relief hole 701 and a pressure relief plate 702 covering the pressure relief hole 701.

[0122] The pressure relief hole 701 has a diameter of 0.7 cm; the pressure relief plate 702 is made of latex.

[0123] like Figure 12-13 The method for attaching the 702 pressure relief pad is as follows: A small hole is designed in the middle of the bottom packaging material. The pressure relief pad is applied to the back using an adhesive application and heating method, covering the small hole. The outer ring of the pressure relief pad has a circular adhesive application area, which is then attached to the inside of the circular hole at the bottom of the packaging box. Figure 12-13 Because the pressure relief sheet 702 deforms more easily under stress than the packaging paper, when the gas pressure inside the packaging increases, the pressure concentrates in the area of ​​the pressure relief sheet 702, causing it to bulge. This prevents the entire packaging box from bulging. Since the pressure relief sheet 702 is located at the bottom of the packaging box, it is less noticeable to consumers, minimizing the risk of bulging. Furthermore, because the pressure relief sheet 702 can withstand greater deformation than the packaging material, it is less prone to breakage.

[0124] like Figure 2 As shown, the unfolded state of the packaging box is the first case, where the bottom plate 7 is connected to the rear side wall 4, and the bottom plate 7 is attached to the front side wall 3, the rear side wall 4, and the right side wall 6 through a folding plate.

[0125] When the packaging box is in the unfolded state, the bottom plate 7 is connected to the rear side wall 4. The packaging box includes: a top cover 2, a front side wall 3, a rear side wall 4, a left side wall 5, and a right side wall 6 extending vertically in the front, back, left, and right directions respectively with the top cover 2 as the center, and a bottom plate 7 extending vertically from the rear side wall 4 away from the top cover 2.

[0126] Creases are provided at the connections between the top cover 2 and the front sidewall 3, the rear sidewall 4, the left sidewall 5, and the right sidewall 6. A crease is also provided at the connection between the rear sidewall 4 and the bottom plate 7. The left and right sides of the front sidewall 3 and the rear sidewall 4 extend outwards to form first folded plates 8. A crease at a 45° angle to the left sidewall 5 is provided on the left first folded plate 8, and a crease at a 45° angle to the right sidewall 6 is provided on the right first folded plate 8. The ends of the front sidewall 3, the left sidewall 5, and the right sidewall 6 away from the top cover 2 extend outwards to form second folded plates 10. The front end, left end, and right end of the bottom plate 7 extend outwards to form third folded plates 11. The left and right third folded plates 11 are the same width as the bottom plate 7 and are just not connected to the first folded plates 8 on the left and right sides of the rear sidewall 4.

[0127] When the packaging box is in the box state, the first folding plate 8 on the left side is attached to the left side wall 5, and the first folding plate 8 on the right side is attached to the right side wall 6; the second folding plate 10 is folded inward to be attached to the bottom plate 7, and the third folding plate 11 is folded upward to be attached to the front side wall 3, the left side wall 5, and the right side wall 6.

[0128] The smoke extraction area 1 and the edge of the flip cover 9 are two parallel straight lines on the top cover 2, and an arc shape on the front side wall 3.

[0129] Example 2: The unfolded state of the packaging paper is the second case, and the base plate 7 is separate.

[0130] The cigarette packaging paper is the same as in Example 1.

[0131] like Figure 6-8 As shown, this embodiment uses the above-mentioned cigarette packaging paper as a packaging box. When the packaging box is in the box body state, it is consistent with the overall situation in Embodiment 1.

[0132] The difference between this embodiment and embodiment 1 is that: when the packaging box is in the unfolded state, the bottom plate 7 is separate, and the bottom plate 7 is attached to the front side wall 3, rear side wall 4, left side wall 5, and right side wall 6 through a folding plate.

[0133] Preferably, when the packaging box is in the unfolded state, the bottom plate 7 is separate, and the packaging box includes: a top cover 2, a bottom plate 7, and a front side wall 3, a rear side wall 4, a left side wall 5, and a right side wall 6 extending vertically in the forward, backward, left and right directions with the top cover 2 as the center.

[0134] Creases are provided at the connection points of the top cover 2 with the front sidewall 3, the rear sidewall 4, the left sidewall 5, and the right sidewall 6. The left and right sides of the front sidewall 3 and the rear sidewall 4 extend outward to form first folded plates 8. The front and rear sides of the left sidewall 5 and the right sidewall 6 extend outward to form fourth folded plates 12. The first folded plate 8 on the left side has a crease at a 45° angle to the left sidewall 5, and the first folded plate 8 on the right side has a crease at a 45° angle to the right sidewall 6. The four sides of the bottom plate 7 extend outward to form fifth folded plates 13, and there is a crease between the bottom plate 7 and the fifth folded plate 13.

[0135] When the packaging box is in the box state, the first folding plate 8 on the left side is attached to the fourth folding plate 12 on the left side, and the first folding plate 8 on the right side is attached to the fourth folding plate 12 on the right side. The fifth folding plate 13 on the front side is attached to the front side wall 3, the fifth folding plate 13 on the rear side is attached to the rear side wall 4, the fifth folding plate 13 on the left side is attached to the left side wall 5, and the fifth folding plate 13 on the right side is attached to the right side wall 6.

[0136] The orthographic projection of the smoke outlet 202 on the top cover 2 is a right-angled rectangle, and the orthographic projection of the smoke outlet 202 on the front side wall 3 is a chamfered rectangle.

[0137] The shapes of the smoke extraction area 1 and the edge of the flip cover 9 are two parallel straight lines on the top cover 2, and a trapezoid on the front side wall 3.

[0138] Example 3: The unfolded state of the packaging paper is the second case, and the base plate 7 is separate.

[0139] like Figure 9-11 As shown, Embodiment 3 is basically the same as Embodiment 2, except that the shapes of the smoke-collecting area 1 and the edge of the flip cover 9 are different. In this embodiment, the shapes of the smoke-collecting area 1 and the edge of the flip cover 9 are two parallel straight lines on the top cover 2, while they are a special shape combining straight lines and curves on the front sidewall 3.

[0140] Regarding the accompanying drawings corresponding to Embodiments 1-3 above, it should be noted that the drawings corresponding to Embodiments 2 and 3 are different. Figure 7 and Figure 10 In order to more accurately represent the positions of the adhesive portion 201 and the tear portion 901, the positions of the adhesive portion 201 and the tear portion 901 in the figure are filled in, while those corresponding to Embodiment 1 are filled in. Figure 3 In the figure, the positions of the adhesive part 201 and the tear-off part 901 are not filled in.

[0141] The cigarette packaging box forming method described in Examples 1 and 2 includes the following steps:

[0142] S1, cut the wrapping paper according to the unfolded diagram of the packaging box and make creases on the wrapping paper; the unfolded state of the packaging box includes two situations. The first situation is that the bottom plate 7 is connected to the rear side wall 4, and the bottom plate 7 is attached to the front side wall 3, rear side wall 4, and right side wall 6 through folding plates. The second situation is that the bottom plate 7 is separate, and the bottom plate 7 is attached to the front side wall 3, rear side wall 4, left side wall 5, and right side wall 6 through folding plates. In this step, the wrapping paper is cut according to the actual situation.

[0143] S2, the cigarette-taking area 1 and the flip-top 9 are formed on the top cover 2 and the front side wall 3; that is, in order to facilitate the removal of the cigarette, an opening is provided at the connection between the top cover 2 and the front side wall 3. Before the opening is provided, the top cover 2 and the front side wall 3 are both ten-layer packaging paper as described in this invention. A portion of the top cover 2 and the front side wall 3 are cut open with a cutter to form the cigarette-taking area 1 and the flip-top 9. Figure 5As shown, firstly, the cutter cuts only to the release layer 105 in terms of layers, dividing the top cover 2 and the front sidewall 3 into the cigarette-taking area 1 with the adhesive part 201 and the flip cover 9 with the tear part 901. The adhesive part 201 is the inner layer of the packaging paper and the self-adhesive layer 106, and the tear part 901 is the outer layer of the packaging paper and the release layer 105. Then, the cutter cuts all the layers of the packaging paper again to form the cigarette-taking opening 202. All ten layers of the packaging paper at the cigarette-taking opening 202 are located on the flip cover 9.

[0144] S3, change the packaging box from the unfolded state to the box state; usually, the packaging box is changed from the unfolded state to the box state by folding.

[0145] S4. Using ultrasonic welding, the PE membrane is melted and bonded under pressure and heat, thereby bonding the joints of the front sidewall 3, rear sidewall 4, left sidewall 5, right sidewall 6, and base plate 7. Different unfolded diagrams will result in different joints after folding; in this step, the existing joints are bonded according to the actual situation.

[0146] Preferably, the conditions for ultrasonic welding in step S2 are: ultrasonic welding frequency of 40kHz, increased pressure of 0.8MPa, amplitude of 1mm, and holding time of 10s. Under the high-frequency vibration of the ultrasonic welding machine, a certain amount of heat is generated, which causes the PE coating layer to melt and adhere, and then the adhesion surface of the box is made more firm by applying pressure.

[0147] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A method for forming a cigarette packaging box, characterized in that, The packaging paper forming the cigarette packaging box consists of an inner part, an outer part, a release layer (105) between the inner part and the outer part, and an adhesive layer (106); The outer part consists of, in order: an outer PE coating layer (101), an outer paper layer (102), an outer composite adhesive layer (103), and an outer PET layer (104). The inner components are, in order: an inner PET layer (107), an inner composite adhesive layer (108), an inner paper layer (109), and an inner PE coating layer (110). The release layer (105) is close to the outer PET layer (104), while the self-adhesive layer (106) is close to the inner PET layer (107). When the packaging box is in the box state, the packaging box includes: top cover (2), front side wall (3), rear side wall (4), left side wall (5), right side wall (6), and bottom plate (7). The top cover (2) and the front side wall (3) are provided with a communicating opening as a cigarette taking area (1) of the packaging box. The cigarette taking area (1) is provided with a flip cover (9) that matches the opening on the top cover (2) and the front side wall (3). The flap (9) is rotatably connected to the upper end of the rear sidewall (4) through a crease, and the flap (9) is provided with a crease corresponding to the crease between the top cover (2) and the front sidewall (3); After the flip cover (9) is reset, the packaging box is in a cuboid state, and the cigarette stick is placed in the internal cavity formed by the packaging box; the innermost layer of the packaging paper is on the side of the packaging box closest to the cigarette stick, and the innermost layer of the packaging paper is an inner PE coating layer (110); the outermost layer of the packaging paper is on the side of the packaging box furthest from the cigarette stick, and the outermost layer of the packaging paper is an outer PE coating layer (101). The top cover (2) and the front sidewall (3) of the packaging box at the cigarette taking area (1) have an adhesive part (201) extending toward the cigarette taking area (1). The packaging paper at the adhesive part (201) is composed of a self-adhesive layer (106), an inner PET layer (107), an inner composite adhesive layer (108), an inner paper layer (109), and an inner PE coating layer (110). The flap (9) is provided with a tear-off part (901) that matches the shape of the adhesive part (201). The packaging paper at the tear-off part (901) is composed of an outer PE coating layer (101), an outer paper layer (102), an outer composite adhesive layer (103), an outer PET layer (104), and a release layer (105). The smoke extraction area (1) is located inside the adhesive part (201) and forms a smoke extraction port (202). The adhesive part (201) near the tear-off part (901) is the self-adhesive layer (106), and the tear-off part (901) near the adhesive part (201) is the release layer (105). By repeatedly sticking and tearing the release layer (105) and the self-adhesive layer (106), the tear-off part (901) and the adhesive part (201) are repeatedly sticked and torn, thereby achieving repeated sticking and tearing of the flip cover (9) and the cigarette taking area (1), and further achieving the closure and exposure of the cigarette taking port (202). The cigarette packaging box forming method includes the following steps: S1. Cut the wrapping paper according to the unfolded diagram of the packaging box and set creases on the wrapping paper; S2, the smoke extraction area (1) and the flip cover (9) are formed on the top cover (2) and the front side wall (3). S3, change the packaging box from the unfolded state to the box state; S4. By using ultrasonic welding, the PE film is melted and bonded under pressure and heat, thereby bonding the front sidewall (3), rear sidewall (4), left sidewall (5), right sidewall (6), and bottom plate (7) together.

2. The method according to claim 1, characterized in that, The outer PE coating layer has a basis weight of 25-28 g / m². 3 Thickness 0.026-0.030mm; The inner PE coating layer has a basis weight of 14-16 g / m³. 3 Thickness 0.014-0.016mm; The outer paper layer (102) is a white cardboard layer or a coated paper layer, and the basis weight of the outer paper layer (102) is 140-160 g / m². 3 Thickness 0.130-0.14mm; The inner paper layer (109) is coated paper, and the basis weight of the inner paper layer (109) is 80-100 g / m². 3 Thickness 0.08-0.1mm; The thickness of the outer PET layer and the inner PET layer is 0.01-0.012 mm; The release layer (105) is selected from PTFE and PE coatings, with a thickness of 0.002-0.004 mm; The self-adhesive layer (106) is selected from PVC self-adhesive and PET self-adhesive, and has a thickness of 0.006-0.007 mm; The outer composite adhesive layer (103) and the inner composite adhesive layer (108) are selected from polyurethane adhesive and epoxy resin adhesive, and have a thickness of 0.003-0.005 mm; The outer PE coating layer (101) and the inner PE coating layer (110) are selected from polyethylene.

3. The method according to claim 1, characterized in that, The orthographic projection of the smoke outlet (202) on the top cover (2) and the front side wall (3) is a rectangle, and the rectangle includes a right-angled rectangle or a chamfered rectangle; The shapes of the smoke extraction area (1) and the edge of the flip cover (9) are two parallel straight lines on the top cover (2), and are arc-shaped, trapezoidal, or a combination of straight lines and curves on the front sidewall (3).

4. The method according to claim 1, characterized in that, The base plate (7) has a pressure relief device, which includes a pressure relief hole (701) and a pressure relief plate (702) covering the pressure relief hole (701). The pressure relief hole (701) has a diameter of 0.7-0.8 cm; the pressure relief plate (702) is made of latex. The unfolded state of the packaging box includes two situations. In the first situation, the bottom plate (7) is connected to the rear side wall (4), and the bottom plate (7) is attached to the front side wall (3), the rear side wall (4), and the right side wall (6) through a folding plate. In the second situation, the bottom plate (7) is separate, and the bottom plate (7) is attached to the front side wall (3), the rear side wall (4), the left side wall (5), and the right side wall (6) through a folding plate.

5. The method according to claim 1, characterized in that, When the packaging box is in the unfolded state, the bottom plate (7) is connected to the rear side wall (4). The packaging box includes: a top cover (2), a front side wall (3), a rear side wall (4), a left side wall (5), and a right side wall (6) that extend vertically in the front, back, left, and right directions respectively with the top cover (2) as the center, and a bottom plate (7) that extends vertically from the rear side wall (4) away from the top cover (2). The top cover (2) has creases at the connection points with the front sidewall (3), the rear sidewall (4), the left sidewall (5), and the right sidewall (6). The rear sidewall (4) has creases at the connection point with the bottom plate (7). The left and right sides of the front sidewall (3) and the rear sidewall (4) extend outwards to form first folded plates (8). The left first folded plate (8) has a crease at a 45° angle to the left sidewall (5), and the right first folded plate (8) has a crease at an angle to the left sidewall (5). The right side wall (6) has a 45° fold; the front side wall (3), the left side wall (5), and the right side wall (6) extend outward from the end away from the top cover (2) to form a second fold plate (10); the front end, left end, and right end of the bottom plate (7) extend outward to form a third fold plate (11); the left side third fold plate (11) and the right side third fold plate (11) are the same width as the bottom plate (7) and are just not connected to the first fold plates (8) on the left and right sides of the rear side wall (4). When the packaging box is in the box state, the first folding plate (8) on the left side is attached to the left side wall (5), and the first folding plate (8) on the right side is attached to the right side wall (6); the second folding plate (10) is folded inward to be attached to the bottom plate (7), and the third folding plate (11) is folded upward to be attached to the front side wall (3), the left side wall (5), and the right side wall (6).

6. The method according to claim 1, characterized in that, When the packaging box is in the unfolded state, the bottom plate (7) is separate. The packaging box includes: top cover (2), bottom plate (7), and front side wall (3), rear side wall (4), left side wall (5), and right side wall (6) extending vertically in the front, back, left and right directions with the top cover (2) as the center. The top cover (2) is provided with creases at the connection between the front side wall (3), the rear side wall (4), the left side wall (5), and the right side wall (6). The left and right sides of the front side wall (3) and the rear side wall (4) extend outward to form a first fold plate (8). The front and rear sides of the left side wall (5) and the right side wall (6) extend outward to form a fourth fold plate (12). The first fold plate (8) on the left side is provided with a crease at a 45° angle to the left side wall (5). The first fold plate (8) on the right side is provided with a crease at a 45° angle to the right side wall (6). The four sides of the bottom plate (7) extend outward to form a fifth fold plate (13). There is a crease between the bottom plate (7) and the fifth fold plate (13). When the packaging box is in the box state, the first folding plate (8) on the left side is attached to the fourth folding plate (12) on the left side, and the first folding plate (8) on the right side is attached to the fourth folding plate (12) on the right side. The fifth folding plate (13) on the front side is attached to the front side wall (3), the fifth folding plate (13) on the rear side is attached to the rear side wall (4), the fifth folding plate (13) on the left side is attached to the left side wall (5), and the fifth folding plate (13) on the right side is attached to the right side wall (6).

7. The method according to claim 1, characterized in that, The conditions for ultrasonic welding in step S2 are: ultrasonic welding frequency of 30-40kHz, pressure increase of 0.5-0.8MPa, amplitude of 1mm, and holding time of 10s.

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