Anti-deformation stone-plastic composite board and production process thereof

Abstract

The invention relates to the technical field of stone-plastic composite boards, in particular to an anti-deformation stone-plastic composite board and a production process thereof.The anti-deformation stone-plastic composite board comprises a composite board body, a grating-shaped supporting structure is integrally formed in the composite board body, and the grating-shaped supporting structure is defined by multiple sets of ribs arranged in a crossed mode. According to the grid-shaped supporting structure, through the enclosing design of the crossed ribs, an internal structure of'multi-point supporting and global stress' is formed, external loads are dispersed to the whole composite board, and the structural rigidity is effectively improved. Due to the precise design that the thickness of each rib is 1-3mm, the supporting strength is guaranteed, meanwhile, redundant weight is avoided, and the contradiction that an existing hollow plate is low in weight but poor in deformation resistance is solved.

Description

Technical Field

[0001] This invention relates to the field of stone-plastic composite panel technology, and more specifically, to a deformation-resistant stone-plastic composite panel and its manufacturing process. Background Technology

[0002] Stone-plastic composite panels are a new type of environmentally friendly decorative material made from stone powder and thermoplastic resin as the main raw materials through mixing and molding processes. With its advantages of being environmentally friendly and non-toxic, wear-resistant, waterproof and moisture-proof, easy to construct and relatively inexpensive, it is widely used in indoor floor and wall decoration and other scenarios, and the market demand continues to grow.

[0003] However, in practical applications, existing stone-plastic composite panels still have significant performance defects, particularly in terms of deformation resistance and sound insulation, making it difficult to meet the requirements of high-quality building decoration. Most existing stone-plastic composite panels use a hollow cavity structure. While this hollow design achieves weight reduction, the lack of reasonable internal support results in insufficient overall structural rigidity and weak deformation resistance. Furthermore, the simple hollow cavity design fails to create an effective sound wave attenuation path, allowing sound waves to easily conduct through the cavity, leading to poor sound insulation and failing to meet the needs of bedrooms, offices, and other environments with high sound insulation requirements.

[0004] Therefore, how to develop a stone-plastic composite board that can simultaneously improve deformation resistance and sound insulation performance, while also taking into account lightweight and easy molding, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution.

[0006] A deformation-resistant stone-plastic composite panel includes a composite panel body, in which a grid-like support structure is integrally formed, the grid-like support structure being formed by multiple sets of intersecting ribs.

[0007] As a preferred embodiment of the present invention, the thickness of the rib is 1 mm to 3 mm.

[0008] As a preferred embodiment of the present invention, the composite board body is obtained by mixing and molding stone powder, thermoplastic resin and additives, wherein the mass ratio of stone powder is 60%-75%.

[0009] As a preferred embodiment of the present invention, a sound insulation cavity is formed between the grid-like support structure and the inner wall of the composite panel body, the length of the sound insulation cavity is 8 cm-12 cm, and the width of the sound insulation cavity is 6 cm-8 cm.

[0010] The present invention also provides a process for producing stone-plastic composite panels, which is used to produce the above-mentioned deformation-resistant stone-plastic composite panels, and includes the following steps:

[0011] Step S1: Weigh out 60%-75% stone powder, 20%-35% thermoplastic resin, and 5%-10% additives by weight, and dry the stone powder until the moisture content is ≤0.5%.

[0012] Step S2: After plasticizing and mixing the thermoplastic resin and additives in a mixing device, add the dried stone powder and continue mixing to obtain a uniform stone-plastic mixture.

[0013] Step S3: The stone-plastic mixture is fed into an extruder and extruded through a molding die with a mandrel to form a composite board body; the end of the mandrel is provided with an air nozzle, and air is sent into the mold cavity at intervals through the air nozzle, so that the material forms a grid-like support structure surrounded by multiple sets of cross ribs in the mold cavity.

[0014] Step S4: The extruded composite board body is fed into a cooling device for shaping to obtain a deformation-resistant stone-plastic composite board;

[0015] Step S5: Cut the shaped anti-deformation stone-plastic composite board to the preset finished size using a cutting device to obtain the anti-deformation stone-plastic composite board.

[0016] As a preferred embodiment of the present invention, the additives in step S1 include 3%-8% plasticizer, 0.5%-2% stabilizer, and 0.3%-1% lubricant, with the mass percentage of each component based on the total mass of the raw materials.

[0017] As a preferred embodiment of the present invention, the molding die includes a die head and a molding shell connected to the die head. The die head has an infeed channel communicating with the extruder outlet. The die head has multiple mandrels, and the ends of the mandrels are provided with air nozzles. The mandrels and the molding shell together form a mold cavity. The die head and mandrels are integrally formed. The mandrels have a branch air channel communicating with the air nozzles. The molding die also has an air inlet channel penetrating the die head and mandrels. The air inlet channel communicates with the branch air channel and is used to connect to an external air supply device. The air inlet channel is used to intermittently supply air to the branch air channel, and together with the mandrels, the material is formed into a composite plate body with a grid-like support structure.

[0018] As a preferred embodiment of the present invention, the air intake is connected to the external air supply device through an air intake pipe, and a one-way valve is provided at the air intake pipe.

[0019] As a preferred embodiment of the present invention, the feed channel is provided with multiple guide plates.

[0020] As a preferred embodiment of the present invention, in step S3, the single inflation volume of the air nozzle is 30cm³-50cm³, the single inflation duration is 0.5s-1s, the interval between two adjacent inflations is 2s-5s, and the inflation pressure is 0.2MPa-0.5MPa.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. The grid-like support structure in this invention, through the enclosing design of intersecting ribs, forms an internal structure of "multi-point support and full-area stress distribution," distributing external loads throughout the composite panel and effectively improving structural rigidity. The precise design of rib thickness from 1mm to 3mm ensures support strength while avoiding redundant weight, resolving the contradiction of existing hollow panels that "reduce weight but have poor deformation resistance."

[0023] 2. In this invention, the grid-like support structure is integrally formed with the composite panel body, avoiding the connection gaps and stress weak points of spliced ​​support structures, so that the support structure and the body form a complete force system, further improving the composite panel's resistance to bending, tension and warping, and meeting the requirements for structural stability during long-term use.

[0024] 3. The sound insulation cavity formed by the grid-like support structure in this invention breaks the "straight-through" sound wave transmission path of existing simple hollow cavities. After the sound waves enter the sound insulation cavity, they need to be reflected multiple times within the cavity and pass through the intersecting ribs. The sound wave energy is continuously lost in this process, significantly improving the sound insulation effect and meeting the needs of scenarios with high sound insulation requirements, such as bedrooms and offices. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the anti-deformation stone-plastic composite panel in Example 1;

[0026] Figure 2 This is a cross-sectional view of the deformation-resistant stone-plastic composite panel in Example 1;

[0027] Figure 3 This is a schematic diagram of the molding die in Example 2;

[0028] Figure 4 This is a cross-sectional view of the molding die in Example 2;

[0029] Figure 5 for Figure 4 Enlarged view of section A.

[0030] The attached figures are labeled as follows:

[0031] 110 Composite panel body; 210 Grille-shaped support structure; 220 Rib; 230 Sound insulation cavity; 310 Molding mold; 320 Mold head; 330 Molding shell; 340 Air inlet pipe; 350 One-way valve; 410 Mandrel; 420 Mold cavity; 430 Feed channel; 440 Guide plate; 510 Air nozzle; 520 Diverting air channel; 530 Air inlet. Detailed Implementation

[0032] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the invention.

[0033] Example 1, such as Figure 1-2 As shown, this invention provides a deformation-resistant stone-plastic composite panel, which includes a composite panel body 110. A grid-like support structure 210 is integrally formed within the composite panel body 110. The grid-like support structure 210 is formed by multiple sets of intersecting ribs 220. The thickness of the ribs 220 is 1 mm to 3 mm. The composite panel body 110 is obtained by mixing stone powder, thermoplastic resin, and additives, wherein the mass percentage of stone powder is 60% to 75%. A sound insulation cavity 230 is formed between the grid-like support structure 210 and the inner wall of the composite panel body 110. The length of the sound insulation cavity 230 is 8 cm to 12 cm, and the width of the sound insulation cavity 230 is 6 cm to 8 cm.

[0034] The composite board body 110 is formed by mixing stone powder, thermoplastic resin and additives in a specific ratio. The proportion of stone powder is designed to be 60%-75%, which not only ensures the environmental protection properties of the composite board (stone powder is a natural inorganic material that is environmentally friendly and non-toxic), but also provides basic strength support for the composite board through the synergistic effect of stone powder and thermoplastic resin, while taking into account the processing fluidity of the material to facilitate subsequent molding.

[0035] The grid-like support structure 210 is integrally formed with the composite panel body 110, and is enclosed by multiple sets of intersecting ribs 220, forming an internal support system similar to a "frame". The intersecting ribs 220 transmit forces to each other, distributing external pressure and tension to the entire composite panel body 110, avoiding deformation caused by local stress concentration; the thickness of the ribs 220 is designed to be 1mm-3mm, which can ensure the structural strength of the ribs themselves and prevent support failure, while not increasing the weight of the composite panel due to excessive thickness, thus meeting the requirements of lightweighting.

[0036] The sound insulation cavity 230 is formed by the enclosure of the grid-like support structure 210 and the inner wall of the composite panel body 110. Its dimensions of 8-12 cm in length and 6-8 cm in width are designed so that sound waves must pass through the grid-like support structure 210 and the sound insulation cavity 230 multiple times during propagation. After entering the sound insulation cavity 230, sound waves undergo reflection, refraction, and energy loss within the cavity. Simultaneously, the ribs 220 of the grid-like support structure 210 further obstruct sound wave transmission, forming a "multiple attenuation" path, thereby reducing the sound wave transmission efficiency.

[0037] The deformation-resistant stone-plastic composite panel in this embodiment achieves the following beneficial effects through the above-described solution:

[0038] 1. Compared to existing simple hollow structures, the grid-like support structure 210 in the deformation-resistant stone-plastic composite panel of this embodiment, through the enclosure design of the cross ribs 220, forms an internal structure of "multi-point support and full-area stress distribution," distributing the external load to the entire composite panel and effectively improving structural rigidity. The precise design of the ribs 220 with a thickness of 1mm-3mm ensures support strength while avoiding redundant weight, resolving the contradiction of existing hollow panels that "reduce weight but have poor deformation resistance."

[0039] 2. The grid-like support structure 210 is integrally formed with the composite panel body 110, avoiding the connection gaps and stress weak points of spliced ​​support structures, so that the support structure and the body form a complete force system, further improving the composite panel's resistance to bending, tension and warping, and meeting the requirements for structural stability during long-term use.

[0040] 3. The sound insulation cavity 230 (8-12cm long, 6-8cm wide) formed by the grid-like support structure 210 breaks the "straight-through" sound wave transmission path of existing simple hollow cavities. After the sound waves enter the sound insulation cavity, they need to be reflected multiple times within the cavity and pass through the cross ribs 220. The sound wave energy is continuously lost in this process. Compared with the "sound wave straight-through" mode of existing hollow panels, the sound insulation effect is significantly improved, which can meet the needs of bedrooms, offices and other scenarios with high sound insulation requirements.

[0041] 4. The combined design of the grid-like support structure 210 and the sound insulation cavity 230 reduces the amount of material used through the internal cavity while ensuring structural strength. Compared with solid stone plastic board, the weight is significantly reduced, which facilitates transportation, handling and construction. It solves the problem of existing solid boards being "strong enough but too heavy". At the same time, it avoids the defect of existing hollow boards being "lightweight but not strong", achieving a balance between lightweight and high strength.

[0042] Example 2, combined with Figures 2 to 5 As shown, this embodiment also provides a production process for producing the deformation-resistant stone-plastic composite panel in Embodiment 1 above, including the following steps:

[0043] Step S1: Weigh out 60%-75% stone powder, 20%-35% thermoplastic resin, and 5%-10% additives by weight. Dry the stone powder until the moisture content is ≤0.5%. The additives include 3%-8% plasticizer, 0.5%-2% stabilizer, and 0.3%-1% lubricant. The weight percentage of each component is based on the total weight of the raw materials. Step S2: After plasticizing and mixing the thermoplastic resin and additives in a mixing device, add the dried stone powder and continue mixing to obtain a homogeneous stone-plastic mixture. Step S3: The stone-plastic mixture is fed into an extruder and extruded through a molding die 310 with a mandrel 410 to form a composite board body 110. An air nozzle 510 is provided at the end of the mandrel 410, through which air is intermittently injected into the die cavity 420, causing the material to form a grid-like support structure 210 surrounded by multiple sets of intersecting ribs 220 within the die cavity 420. The air nozzle 510 has a single inflation volume of 30cm³-50cm³, a single inflation duration of 0.5s-1s, an interval of 2s-5s between adjacent inflations, and an inflation pressure of 0.2MPa-0.5MPa. Step S4: The extruded composite board body 110 is fed into a cooling device for shaping to obtain an anti-deformation stone-plastic composite board. Step S5: The shaped anti-deformation stone-plastic composite board is cut to length according to a preset finished product size using a cutting device to obtain an anti-deformation stone-plastic composite board.

[0044] The structure of the molding die 310 used in the above production process is as follows:

[0045] The molding die 310 includes a die head 320 and a molding shell 330 connected to the die head 320. The die head 320 has a feed channel 430 communicating with the extruder outlet, and multiple guide plates 440 are provided in the feed channel 430. The die head 320 has multiple mandrels 410, and the end of each mandrel 410 is provided with an air nozzle 510. The mandrels 410 and the molding shell 330 together form the mold cavity 420. The die head 320 and the mandrels 410 are integrally formed, and the mandrels 410 have a branch channel communicating with the air nozzles 510. Air passage 520; The molding die 310 is also provided with an air inlet 530 that passes through the die head 320 and the mandrel 410. The air inlet 530 is connected to the diversion air passage 520. The air inlet 530 is used to connect with an external air supply device. The air inlet 530 is connected to the external air supply device through an air inlet pipe 340. A one-way valve 350 is provided at the air inlet pipe 340. The air inlet 530 is used to send air into the diversion air passage 520 at intervals. Together with the mandrel 410, the material is formed into a composite plate body 110 with a grid-like support structure 210.

[0046] In step S1, the stone powder is dried to a moisture content of ≤0.5% to prevent the moisture in the stone powder from generating bubbles during subsequent plasticizing, mixing, and extrusion molding, which would lead to pores inside the composite board and affect the structural strength and sound insulation performance. The additives are mixed in a specific ratio (plasticizer 3%-8%, stabilizer 0.5%-2%, lubricant 0.3%-1%). The plasticizer can improve the flexibility of the thermoplastic resin, making it easier for the material to mix and mold. The stabilizer can prevent the material from undergoing thermal oxidation degradation during high-temperature plasticizing and extrusion, ensuring the stability of the material performance. The lubricant can reduce the flow resistance of the material in the feed channel 430 and the mold cavity 420, improving the smoothness of molding.

[0047] In step S2, the thermoplastic resin and additives are first plasticized and mixed to ensure that the additives are evenly dispersed in the thermoplastic resin matrix. Then, dried stone powder is added and mixed again to ensure that the stone powder and the plasticized resin system are fully integrated to form a uniform stone-plastic mixture, thus avoiding the problem of inconsistent strength and easy deformation of the composite board due to uneven local composition.

[0048] The feed channel 430 of the die head 320 is connected to the extruder outlet. Multiple guide plates 440 in the feed channel 430 can guide the stone-plastic mixture to flow evenly, avoiding uneven flow rate and accumulation of materials in the channel, and ensuring that the material entering the mold cavity 420 is evenly distributed. The die head 320 and the mandrel 410 are integrally formed to ensure the dimensional accuracy of the mold cavity 420 and avoid molding errors caused by assembly gaps.

[0049] An external air supply device delivers air to the air inlet duct 530 through the air inlet pipe 340. A one-way valve 350 prevents air backflow and ensures stable pressure within the air duct. Air enters the diversion air duct 520 inside the mandrel 410 through the air inlet duct 530, and then is intermittently injected into the mold cavity 420 through the air nozzle 510 at the end of the mandrel 410. Combined with the specific inflation parameters of the air nozzle 510 (single inflation volume 30cm³-50cm³, duration 0.5s-1s, interval time 2s-5s, pressure 0.2MPa-0.5MPa), intermittent inflation allows the material in the mold cavity 420 to form a periodic "support and cavity" structure under air pressure, ultimately enclosing a grid-like support structure 210. This parameter design allows for precise control of the grid spacing and size, ensuring the uniformity of the support structure.

[0050] In step S4, the extruded composite plate body 110 is fed into a cooling device to quickly reduce the material temperature, thereby fixing the shape of the grid-like support structure 210 and the composite plate body 110, avoiding structural deformation caused by untimely cooling, and ensuring the dimensional accuracy and structural stability of the composite plate.

[0051] In step S5, the shaped composite board is cut according to the preset finished product size to meet the installation and use requirements of different scenarios. The cutting process is based on the stable structure after cooling and shaping, which can avoid problems such as edge chipping and cracking during cutting.

[0052] The beneficial effects that can be achieved through the above process include:

[0053] 1. In step S1, weigh out stone powder (60%-75%), thermoplastic resin (20%-35%), and additives (5%-10%) according to their mass ratios. Dry the stone powder until the moisture content is ≤0.5% to effectively prevent moisture vaporization and bubble formation during subsequent high-temperature processing, ensuring the structural density of the composite board body 110, thereby ensuring the deformation resistance and sound insulation effect of the sound insulation cavity 230. The additives are precisely proportioned as "plasticizer (3%-8%), stabilizer (0.5%-2%), and lubricant (0.3%-1%)". The plasticizer improves the flexibility of the thermoplastic resin, the stabilizer prevents thermal oxidation degradation of the material, and the lubricant reduces flow resistance. The three work synergistically to optimize processing performance. Combined with the mixing sequence of "plasticizing the thermoplastic resin and additives first, then adding the dried stone powder", the additives are evenly dispersed in the resin matrix and fully integrated with the stone powder, avoiding fluctuations in composite board strength caused by uneven local composition, and significantly improving the consistency of batch production.

[0054] 2. The feed channel 430 inside the mold head 320 is equipped with multiple guide plates 440, which can guide the stone-plastic mixture to flow evenly, avoiding uneven flow rate and local accumulation, thus providing a prerequisite for the consistency of the grid-like support structure 210. The mold head 320 and the mandrel 410 are integrally formed, eliminating the dimensional error of the mold cavity 420 caused by assembly gaps, ensuring that the key dimensions such as the rib spacing and thickness (1mm-3mm) of the grid-like support structure 210 meet the design requirements. The integrated air channel system consisting of the air inlet 530, the diversion air channel 520, and the air nozzle 510, together with the one-way valve 350 at the air inlet pipe 340, prevents air backflow, ensures stable inflation pressure, and avoids uneven dimensions of the grid-like support structure 210 due to pressure fluctuations, providing reliable structural support for intermittent inflation.

[0055] 3. In step S3, precise parameters are set for single inflation volume (30cm³-50cm³), duration (0.5s-1s), interval (2s-5s), and pressure (0.2MPa-0.5MPa). Air is intermittently injected into the mold cavity 420 through the air nozzle 510, causing the material to form a periodic "support and cavity" structure. This precisely encloses a grid-like support structure 210 composed of multiple sets of intersecting ribs 220, ensuring support strength while avoiding dimensional deviations in the sound insulation cavity 230 caused by over-inflation. This achieves a balance between structural strength and lightweighting, and solves the technical problem of mass production of complex internal support structures. After extrusion, the composite board body 110 is rapidly cooled by a cooling device, fixing the shape of the grid-like support structure 210 and the composite board body 110, preventing warping and deformation caused by insufficient cooling. The fixed-length cutting process uses cutting equipment to process the finished product according to the preset dimensions, adapting to different installation requirements. Furthermore, cutting based on a stable structure effectively avoids edge chipping and cracking.

[0056] 4. The entire process in this embodiment requires no additional complex steps. Through the collaboration of the extruder and molding die 310, combined with intermittent air inflation technology, the grid-like support structure 210 and the composite panel body 110 are automatically and continuously formed, improving production efficiency and reducing production costs. The composite panel body 110 uses natural inorganic stone powder, accounting for 60%-75%, as the main raw material, reducing the amount of thermoplastic resin used. This controls raw material costs and enhances the product's green competitiveness due to the environmentally friendly properties of stone powder, aligning with the trend of environmentally friendly development in decorative materials. Ultimately, through deep synergy between the process and product structure, the composite panels produced in batches can achieve significant improvements in deformation resistance and sound insulation performance, successfully solving the core pain points of existing stone-plastic composite panels, such as poor deformation resistance, insufficient sound insulation, and poor batch consistency.

[0057] In summary, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.

Claims

1. A deformation-resistant stone plastic composite panel, characterized in that: The composite panel body (110) includes an integrally formed grid-shaped support structure (210) in the composite panel body (110), which is formed by multiple sets of intersecting ribs (220).

2. The anti-deformation stone-plastic composite board according to claim 1, characterized in that: The thickness of the rib (220) is 1 mm to 3 mm.

3. The anti-deformation stone-plastic composite board according to claim 1, characterized in that: The composite board body (110) is formed by mixing stone powder, thermoplastic resin and additives, wherein the mass ratio of stone powder is 60%-75%.

4. The anti-deformation stone-plastic composite board according to claim 1, characterized in that: A sound insulation cavity (230) is formed between the grid-like support structure (210) and the inner wall of the composite panel body (110). The length of the sound insulation cavity (230) is 8-12 cm and the width of the sound insulation cavity (230) is 6-8 cm.

5. A process for producing stone-plastic composite panels, used to produce the above-mentioned deformation-resistant stone-plastic composite panels, comprising the following steps: Step S1: Weigh out 60%-75% stone powder, 20%-35% thermoplastic resin, and 5%-10% additives by weight, and dry the stone powder until the moisture content is ≤0.5%. Step S2: After plasticizing and mixing the thermoplastic resin and additives in a mixing device, add the dried stone powder and continue mixing to obtain a uniform stone-plastic mixture. Step S3: The stone-plastic mixture is fed into an extruder and extruded through a molding die (310) with a mandrel (410) to form a composite board body (110); the end of the mandrel (410) is provided with an air nozzle (510), and air is sent into the mold cavity (420) at intervals through the air nozzle (510), so that the material forms a grid-like support structure (210) surrounded by multiple sets of cross ribs (220) in the mold cavity (420). Step S4: The extruded composite board body (110) is fed into a cooling device for shaping to obtain a deformation-resistant stone-plastic composite board; Step S5: Cut the shaped anti-deformation stone-plastic composite board to the preset finished size using a cutting device to obtain the anti-deformation stone-plastic composite board.

6. The stone-plastic composite panel production process according to claim 5, characterized in that: The additives mentioned in step S1 include 3%-8% plasticizer, 0.5%-2% stabilizer, and 0.3%-1% lubricant, with the mass percentage of each component based on the total mass of the raw materials.

7. The stone-plastic composite panel production process according to claim 5, characterized in that: The molding die (310) includes a die head (320) and a molding shell (330) connected to the die head (320). The die head (320) has a feed channel (430) communicating with the extruder outlet. The die head (320) has multiple mandrels (410) inside, and each mandrel (410) has an air nozzle (510) at its end. The mandrels (410) and the molding shell (330) together form the mold cavity (420). The die head (320) and the mandrels (410) are integrally formed, and the mandrels (410) have an internal opening. The mold (310) is provided with a split air passage (520) that communicates with the air nozzle (510). The mold (310) is also provided with an air inlet (530) that passes through the mold head (320) and the mandrel (410). The air inlet (530) communicates with the split air passage (520) and is used to connect to an external air supply device. The air inlet (530) is used to send air into the split air passage (520) at intervals, and cooperates with the mandrel (410) to form the material into a composite plate body (110) with a grid-like support structure (210).

8. The stone-plastic composite panel production process according to claim 5, characterized in that: The air intake (530) is connected to the external air supply device through the air intake pipe (340), and a one-way valve (350) is provided at the air intake pipe (340).

9. The stone-plastic composite panel production process according to claim 5, characterized in that: Multiple guide plates (440) are provided in the feed channel (430).

10. The stone-plastic composite panel production process according to claim 5, characterized in that: In step S3, the single inflation volume of the air nozzle (510) is 30cm³-50cm³, the single inflation duration is 0.5s-1s, the interval between two adjacent inflations is 2s-5s, and the inflation pressure is 0.2MPa-0.5MPa.

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