Pre-folded paper mat and method of paper mat folding

Abstract

The application discloses a pre-folded paper pad and a paper feeding method of the pre-folded paper pad. The pre-folded paper pad comprises a bottom surface and two folded surfaces. The width of the head of the bottom surface is smaller than the width of the non-head of the bottom surface. The overall width of the head of the two folded surfaces is smaller than the overall width of the non-head of the two folded surfaces. The pre-folded paper pad of the application reduces the width of the head of the bottom surface and the overall width of the head of the two folded surfaces synchronously, so that the friction between the head of the pre-folded paper pad and the inner wall of the flow channel of a paper pad forming machine is small when the paper is fed. The deformation reaction force of the paper is reduced. The forming gear at the outlet of the flow channel of the paper pad forming machine can clamp the paper of the "upper and lower layers" of the head of the pre-folded paper pad at the same time. The "upper and lower layers" of the head of the pre-folded paper pad are pulled to realize feeding. The upper and lower parts of the inner flow channel of the paper pad forming machine are fed synchronously. The feeding is smooth. The pillow-shaped three-dimensional pad material in the paper pad forming machine can be formed smoothly.

Description

Technical Field

[0001] This invention relates to a pre-folded paper pad and a method for feeding the pre-folded paper pad. Background Technology

[0002] In logistics and transportation, items are cushioned by placing cushioning materials in boxes or bags. Pillow-shaped three-dimensional paper pads are one such type. The pre-folded paper pads are formed into pillow-shaped three-dimensional paper pads after passing through the inner and outer flow channels of the paper pad forming machine. The raw material for the pre-folded paper pads consists of a middle surface and two folded surfaces located on both sides of the middle surface. The two folded surfaces are folded onto the middle surface, and the edges of the two folded surfaces are spaced apart, perfectly aligned, or have overlapping areas.

[0003] Currently, when pre-folded paper pads are placed into the inner and outer flow channels of a paper pad forming machine, the paper material has a certain width, resulting in a large contact area between the pre-folded paper pad and the outer flow channel during feeding. The pre-folded paper pad deforms as it is fed in, leading to significant resistance from both the flow channel and the paper deformation. This results in slow feeding speed, a tendency for the pre-folded paper pad to skew, and low efficiency. Therefore, the head of the pre-folded paper pad usually needs to be processed. The current method is to first flatten the head (front end) of the pre-folded paper pad, then fold it into a triangular shape, and then restore it to its pre-folded state. This method significantly reduces the width of the head compared to the previous method, improving feeding speed. The friction between the head of the folded paper pad and the inner wall of the flow channel is small, which also reduces the deformation reaction force of the paper and improves the smoothness of paper feeding. However, when feeding the paper, the paper material on the middle surface of the pre-folded paper pad head will be clamped by the forming gear of the paper pad forming machine and conveyed forward first. The paper material on the folded side of the pre-folded paper pad head will not be clamped by the forming gear immediately. It needs to move a certain distance in the flow channel before it is clamped due to deformation. During the movement, the folded side of the pre-folded paper pad, which was originally located above the inner flow channel, may be pulled to the bottom of the inner flow channel due to the resistance of the flow channel and the deformation force driven by the flow channel. This will cause the pillow-shaped three-dimensional pad material to fail to form, resulting in forming failure.

[0004] Therefore, overcoming the aforementioned technical deficiencies is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a pre-folded paper pad and a method for feeding the pre-folded paper pad, so as to solve at least one of the above-mentioned technical problems.

[0006] According to one aspect of the present invention, a pre-folded paper pad is provided, comprising a bottom surface and two folding surfaces, the two folding surfaces being respectively connected to two sides of the bottom surface, and the two folding surfaces being folded onto the bottom surface.

[0007] The width of the head of the bottom surface is less than the width of the non-head of the bottom surface, and the overall width of the heads of the two folded surfaces is less than the overall width of the non-head of the two folded surfaces.

[0008] The pre-folded paper pad of the present invention simultaneously reduces the width of the bottom head and the overall width of the two folded heads, that is, simultaneously reduces the width of the "upper and lower layers" of the paper feed head of the pre-folded paper pad. This results in less friction between the head of the pre-folded paper pad and the inner wall of the flow channel of the paper pad forming machine during paper feeding, reducing the deformation reaction force of the paper material and improving the smoothness of paper feeding. This allows the forming gear at the flow channel outlet of the paper pad forming machine to almost simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feed head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feed head to achieve feeding. This allows the paper to be fed simultaneously from the top and bottom of the inner flow channel of the paper pad forming machine, ensuring smooth paper feeding, thereby ensuring the smooth forming of the pillow-shaped three-dimensional pad material in the paper pad forming machine.

[0009] In some implementations, the connection between the folded surface and the bottom surface near the foremost point of the bottom surface can be separate.

[0010] Therefore, the two sides of the bottom surface near the front end can be folded towards the middle of the bottom surface to reduce the width of the bottom head, and the two sides of the bottom surface can be inclined towards the middle of the bottom surface to reduce the width of the bottom head. The folded surface near the front end of the bottom surface can be folded towards the middle of the bottom surface to reduce the overall width of the folded surface head, and the side of the folded surface away from the middle of the bottom surface can be inclined towards the middle of the bottom surface to reduce the overall width of the folded surface head.

[0011] In some embodiments, the head of the bottom surface may be folded and / or the head of the folded surface may be folded.

[0012] Therefore, the folded bottom head can reduce the width of the bottom head, and the folded folded head can reduce the overall width of the folded folded head.

[0013] In some embodiments, the two sides of the head of the bottom surface can be tilted towards the middle of the bottom surface at angles α1 and α2, respectively, where 0 degrees < α1 < 90 degrees and 0 degrees < α2 < 90 degrees.

[0014] The side of the head of the folded surface 2 that is away from the middle of the bottom surface 1 can be tilted toward the middle of the bottom surface with tilt angles of β1 and β2, respectively, where 0 degrees < β1 < 90 degrees and 0 degrees < β2 < 90 degrees.

[0015] Therefore, the slope of the two sides of the head of the bottom surface towards the middle of the bottom surface from 0 to 90 degrees (excluding 0 and 90 degrees) can reduce the width of the head of the bottom surface, and the slope of the side of the head of the folded surface away from the middle of the bottom surface towards the middle of the bottom surface from 0 to 90 degrees (excluding 0 and 90 degrees) can reduce the overall width of the head of the folded surface.

[0016] In some implementations, 20 degrees ≤ α1 ≤ 70 degrees, 20 degrees ≤ α2 ≤ 70 degrees, 20 degrees ≤ β1 ≤ 70 degrees, and 20 degrees ≤ β2 ≤ 70 degrees.

[0017] Therefore, the fact that the two sides of the head of the bottom surface are inclined at 20 to 70 degrees toward the middle of the bottom surface, and the side of the head of the folded surface away from the middle of the bottom surface is inclined at 20 to 70 degrees toward the middle of the bottom surface, can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding.

[0018] In some implementations, 40 degrees ≤ (α1 or α2 + β1 or β2) ≤ 140 degrees.

[0019] Therefore, the angle between one side of the head of the bottom surface tilting towards the middle of the bottom surface and the angle between the side of the head of the folded surface away from the middle of the bottom surface tilting towards the middle of the bottom surface, totaling 40 degrees to 140 degrees, can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding.

[0020] In some implementations, when the width of the outlet of the flow channel of the paper pad forming machine for the pre-folded paper pad is A, the width of the head of the bottom surface is greater than or equal to zero and less than or equal to 1.2A, and the overall width of the heads of the two folded surfaces is greater than or equal to zero and less than or equal to 1.2A.

[0021] Therefore, the width of the frontmost point of the bottom surface and the overall width of the frontmost points of the two folded surfaces being slightly larger than the width of the outlet of the flow channel can also ensure smooth paper feeding.

[0022] In some embodiments, when the closing angle of one sidewall of the flow channel of the paper pad forming machine for the pre-folded paper pad is B1 and the closing angle of the other sidewall is B2, 0 degrees ≤ (α1+α2) ≤ (B1+B2+30 degrees) and 0 degrees ≤ (β1+β2) ≤ (B1+B2+30 degrees).

[0023] Therefore, when the two sides of the head of the bottom surface are tilted towards the middle of the bottom surface by a total of 0 degrees to (B1+B2+30 degrees) and the sides of the heads of the two folded surfaces away from the middle of the bottom surface are tilted towards the middle of the bottom surface by a total of 0 degrees to (B1+B2+30 degrees), that is, when the folding range of the head of the pre-folded paper pad is slightly greater than the folding range of the two side walls of the flow channel, smooth paper feeding can also be ensured.

[0024] In some embodiments, a connecting portion between the head of the folded surface and the non-head of the folded surface may be separate, with the separation area starting from the side of the folded surface away from the middle of the bottom surface.

[0025] Therefore, the frontmost section of the folded surface near the bottom can be folded towards the middle of the bottom to reduce the overall width of the folded surface head.

[0026] In some implementations, the area between the two folded surfaces can be flat.

[0027] This ensures that the pre-folded paper pads will not get stuck on the separating rod in the middle of the inner flow channel of the paper pad forming machine when the paper is fed, thus ensuring smooth paper feeding.

[0028] In some implementations, the shape and size of the head of the bottom surface can be the same as the overall shape and size of the heads of the two folded surfaces.

[0029] Therefore, this ensures that the forming gear of the paper pad forming machine can simultaneously clamp the paper on the "upper and lower layers" of the pre-folded paper pad feed head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feed head to achieve feeding.

[0030] According to another aspect of the present invention, a method for feeding a pre-folded paper pad is also provided, comprising the following steps:

[0031] a. Process the head of the pre-folded paper pad so that the width of the head of the bottom surface of the pre-folded paper pad is smaller than the width of the non-head of the bottom surface, and make the overall width of the head of the two folded surfaces of the pre-folded paper pad smaller than the overall width of the non-head of the two folded surfaces.

[0032] b. Feed the head of the pre-folded paper pad into the flow channel of the paper pad forming machine. The bottom surface of the pre-folded paper pad is located in the area between the inner flow channel and the outer flow channel of the paper pad forming machine, and the folded surface of the pre-folded paper pad is located in the area between the inner flow channel and the outer flow channel of the paper pad forming machine.

[0033] c. The forming gear in the paper pad forming machine bites the folding surface and bottom surface of the pre-folded paper pad;

[0034] d. The forming gear in the paper pad forming machine pulls the pre-folded paper pad downstream.

[0035] The paper feeding method of this invention, because the head of the pre-folded paper pad is processed before paper feeding, simultaneously reduces the width of the bottom head of the pre-folded paper pad and the overall width of the two folded head surfaces, that is, simultaneously reduces the width of the "upper and lower layers" of the pre-folded paper pad feed head. During paper feeding, i.e., when the head of the pre-folded paper pad is fed into the flow channel of the paper pad forming machine, the friction between the head of the pre-folded paper pad and the inner wall of the flow channel of the paper pad forming machine is small, reducing the deformation reaction force of the paper material, improving the smoothness of paper feeding, and making the flow channel outlet of the paper pad forming machine more efficient. The forming gear can clamp the paper on the "upper and lower layers" of the pre-folded paper pad feed head almost simultaneously, that is, it can clamp the folded surface and bottom surface of the pre-folded paper pad almost simultaneously. At the same time, it pulls the "upper and lower layers" of the pre-folded paper pad feed head to realize feeding, that is, to convey it in the downstream direction. This allows the upper part (the area between the upper part of the inner flow channel and the outer flow channel) and the lower part (the area between the lower part of the inner flow channel and the outer flow channel) of the paper pad forming machine to feed paper synchronously, ensuring smooth paper feeding. This ensures the smooth forming of the pillow-shaped three-dimensional pad material in the paper pad forming machine.

[0036] In some embodiments, in step a, the head of the pre-folded paper pad is processed as follows: first, the connecting part of the folded surface and the bottom surface near the head of the bottom surface is cut off; then, the two sides of the head of the bottom surface are folded towards the middle of the bottom surface so that the two sides of the head of the bottom surface are inclined towards the middle of the bottom surface with inclination angles α1 and α2 respectively; and the side of the head of the folded surface away from the middle of the bottom surface is folded towards the middle of the bottom surface so that the side of the head of the folded surface away from the middle of the bottom surface is inclined towards the middle of the bottom surface with inclination angles β1 and β2 respectively.

[0037] Therefore, folding the two sides of the head of the bottom surface towards the middle of the bottom surface so that the two sides of the head of the bottom surface tilt towards the middle of the bottom surface can reduce the width of the head of the bottom surface, and folding the side of the head of the folded surface away from the middle of the bottom surface towards the middle of the bottom surface so that the side of the head of the folded surface away from the middle of the bottom surface tilts towards the middle of the bottom surface can reduce the overall width of the head of the folded surface.

[0038] In some implementations, 0 degrees < α1 < 90 degrees, 0 degrees < α2 < 90 degrees, 0 degrees < β1 < 90 degrees, and 0 degrees < β2 < 90 degrees.

[0039] Therefore, the slope of the two sides of the head of the bottom surface towards the middle of the bottom surface from 0 to 90 degrees (excluding 0 and 90 degrees) can reduce the width of the head of the bottom surface, and the slope of the side of the head of the folded surface away from the middle of the bottom surface towards the middle of the bottom surface from 0 to 90 degrees (excluding 0 and 90 degrees) can reduce the overall width of the head of the folded surface.

[0040] In some implementations, 20 degrees ≤ α1 ≤ 70 degrees, 20 degrees ≤ α2 ≤ 70 degrees, 20 degrees ≤ β1 ≤ 70 degrees, and 20 degrees ≤ β2 ≤ 70 degrees.

[0041] Therefore, the fact that the two sides of the head of the bottom surface are inclined at 20 to 70 degrees toward the middle of the bottom surface, and the side of the head of the folded surface that is far from the middle of the bottom surface is inclined at 20 to 70 degrees toward the middle of the bottom surface, can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head. That is, it can clamp the folded surface and the bottom surface of the pre-folded paper pad almost simultaneously, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding.

[0042] In some implementations, 40 degrees ≤ (α1 or α2 + β1 or β2) ≤ 140 degrees.

[0043] Therefore, the angle between one side of the bottom head and the middle of the bottom surface, and the angle between the side of the folded surface and the middle of the bottom surface, which is far from the middle of the bottom surface, together, is 40 degrees to 140 degrees. This ensures that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feed head. That is, it can clamp the folded surface and the bottom surface of the pre-folded paper pad almost simultaneously, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feed head to achieve feeding.

[0044] In some implementations, in step b, when the width of the outlet of the flow channel is A, the width of the foremost point of the bottom surface is greater than or equal to zero and less than or equal to 1.2A, and the overall width of the foremost points of the two folded surfaces is greater than or equal to zero and less than or equal to 1.2A.

[0045] Therefore, the width of the bottom head and the overall width of the two folded heads being slightly larger than the width of the flow channel outlet can also ensure smooth paper feeding.

[0046] In some implementations, in step b, when the convergence angle of one sidewall of the flow channel is B1 and the convergence angle of the other sidewall is B2, 0 degrees ≤ (α1+α2) ≤ (B1+B2+30 degrees) and 0 degrees ≤ (β1+β2) ≤ (B1+B2+30 degrees).

[0047] Therefore, when the two sides of the head of the bottom surface are tilted towards the middle of the bottom surface by a total of 0 degrees to (B1+B2+30 degrees) and the sides of the heads of the two folded surfaces away from the middle of the bottom surface are tilted towards the middle of the bottom surface by a total of 0 degrees to (B1+B2+30 degrees), that is, when the folding range of the head of the pre-folded paper pad is slightly greater than the folding range of the two side walls of the flow channel, smooth paper feeding can also be ensured.

[0048] In some implementations, after the connecting portion near the foremost point of the bottom surface to the folded surface is cut open, the head of the pre-folded paper pad is divided into an upper paper pad and a lower paper pad.

[0049] In step b, the lower layer of the pre-folded paper pad is located between the inner flow channel and the outer flow channel of the paper pad forming machine, and the upper layer of the pre-folded paper pad is located between the inner flow channel and the outer flow channel of the paper pad forming machine.

[0050] Therefore, the two sides of the bottom surface near the very front can be folded towards the middle of the bottom surface to form a lower paper pad, thus reducing the width of the bottom head. Alternatively, the two sides of the bottom surface can be inclined towards the middle of the bottom surface to form a lower paper pad, thus reducing the width of the bottom head. The folded surface near the very front of the bottom surface can be folded towards the middle of the bottom surface to form an upper paper pad, thus reducing the overall width of the folded surface head. Alternatively, the side of the folded surface away from the middle of the bottom surface can be inclined towards the middle of the bottom surface to form an upper paper pad, thus reducing the overall width of the folded surface head. In this way, the upper paper pad between the inner flow channel and the outer flow channel of the paper pad forming machine and the lower paper pad between the inner flow channel and the outer flow channel of the paper pad forming machine are simultaneously conveyed downstream, ensuring smooth paper feeding.

[0051] In some embodiments, in step a, the head of the pre-folded paper pad is processed as follows: first, the connecting part between the folded surface and the bottom surface near the foremost point of the bottom surface is cut off; then, the two connecting parts between the head and the non-head of the bottom surface are cut off, with the cutting area starting from both sides of the bottom surface towards the middle of the bottom surface; then, the connecting part between the head and the non-head of the folded surface is cut off, with the cutting area starting from the side of the folded surface away from the middle of the bottom surface; then, the two sides of the head of the bottom surface are folded towards the middle of the bottom surface, and the side of the head of the folded surface away from the middle of the bottom surface is folded towards the middle of the bottom surface.

[0052] Therefore, folding the two sides of the bottom surface near the front end toward the middle of the bottom surface can reduce the width of the bottom head, and folding the folded surface near the front end toward the middle of the bottom surface can reduce the overall width of the folded surface head.

[0053] In some implementations, after the head of the pre-folded paper pad is processed in step a,

[0054] The foremost tip of the bottom surface of the pre-folded paper pad can be pointed or flat-headed, and / or

[0055] The foremost tip of the folded surface of a pre-folded paper pad can be pointed or flat.

[0056] Therefore, as long as the width of the head of the bottom surface is less than the width of the non-head of the bottom surface, and the overall width of the heads of the two folded surfaces is less than the overall width of the non-head of the two folded surfaces, the processing style of the front end of the head of the bottom surface can be pointed or flat, and the processing style of the front end of the head of the folded surface can be pointed or flat. Attached Figure Description

[0057] Figure 1 For existing pre-folded paper pad styles;

[0058] Figure 2The processing style for the head of the existing pre-folded paper pad;

[0059] Figure 3 This is a schematic diagram of the structure of a pre-folded paper pad according to one embodiment of the present invention;

[0060] Figure 4 This is a schematic diagram of the structure of the pre-folded paper pad according to the second embodiment of the present invention;

[0061] Figure 5 This is a schematic diagram of the structure of the pre-folded paper pad according to the third embodiment of the present invention;

[0062] Figure 6 This is a schematic diagram of the structure of the pre-folded paper pad according to the fourth embodiment of the present invention;

[0063] Figure 7 This is a schematic diagram of the structure of the pre-folded paper pad according to the fifth embodiment of the present invention;

[0064] Figure 8 This is a schematic diagram of the structure of the pre-folded paper pad according to the sixth embodiment of the present invention;

[0065] Figure 9 This is a schematic diagram of the structure of the pre-folded paper pad according to the seventh embodiment of the present invention;

[0066] Figure 10 This is a schematic diagram of the structure of the pre-folded paper pad according to the eighth embodiment of the present invention;

[0067] Figure 11 This is a state diagram of the pre-folded paper pad and flow channel assembly according to one embodiment of the present invention;

[0068] Figure 12 This is a flowchart of a method for feeding paper onto a pre-folded paper pad according to one embodiment of the present invention. Detailed Implementation

[0069] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0070] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0071] Figure 1 For existing pre-folded paper mat styles.

[0072] refer to Figure 1 The existing pre-folded paper pad includes a middle surface 100 and two folding surfaces 200 located on both sides of the middle surface 100. The two folding surfaces 200 are folded toward the middle surface 100. The edges of the two folding surfaces 200 along the length direction of the middle surface 100 are spaced apart, exactly aligned, or have overlapping areas.

[0073] Figure 2 The processing style for the head of the existing pre-folded paper pad.

[0074] refer to Figure 2 First, the head (front end) of the pre-folded paper pad is flattened, then folded into a triangular shape, and then restored to the pre-folded state. This greatly reduces the width of the head of the pre-folded paper pad, resulting in less friction between the head of the pre-folded paper pad and the inner wall of the flow channel of the paper pad forming machine during paper feeding. It also reduces the deformation reaction force of the paper material, which can improve the smoothness of paper feeding. However, during paper feeding, the paper material on the middle surface of the head of the pre-folded paper pad will be clamped by the forming gear of the paper pad forming machine and conveyed forward first. The paper material on the folded side of the head of the pre-folded paper pad will not be clamped by the forming gear immediately. It needs to move a certain distance in the flow channel before it is clamped due to deformation. During the movement, the folded side of the pre-folded paper pad, which was originally located above the inner flow channel, may be pulled to the bottom of the inner flow channel due to the resistance of the flow channel and the deformation force driven by the flow channel. This will cause the pillow-shaped three-dimensional pad material to fail to form, resulting in forming failure.

[0075] Example 1:

[0076] Figure 3 The structure of a pre-folded paper pad according to one embodiment of the present invention is shown schematically.

[0077] refer to Figure 3 The pre-folded paper pad includes a bottom surface 1 and two folding surfaces 2. The two folding surfaces 2 are integrally connected to the two sides of the bottom surface 1, and the two folding surfaces 2 are folded onto the bottom surface 1.

[0078] refer to Figure 3 The head 101 of the bottom surface 1 refers to the area from the two sides of the bottom surface 1, sloping towards the middle of the bottom surface 1, to the very front of the bottom surface 1. Figure 3 A portion of the bottom surface 1 with a length of L, where the non-head 102 of the bottom surface 1 refers to the area of ​​the bottom surface 1 excluding the head 101; the head 201 of the folded surface 2 refers to the area from the side of the folded surface 2 away from the middle of the bottom surface 1, sloping towards the middle of the bottom surface 1, to the foremost point of the folded surface 2, i.e. Figure 3 A portion of the folded surface 2 with a length of L, the non-head 202 of the folded surface 2 refers to the area of ​​the folded surface 2 excluding the head 201.

[0079] refer to Figure 3 The width of the head 101 of the bottom surface 1 is less than the width of the non-head 102 of the bottom surface 1. The width of the head 201 of one folded surface 2 is less than the width of the non-head 202 of the folded surface 2. The width of the head 201 of another folded surface 2 is less than the width of the non-head 202 of the folded surface 2. That is, the overall width of the two heads 201 of the two folded surfaces 2 is less than the overall width (sum of widths) of the non-head 202 of the two folded surfaces 2.

[0080] refer to Figure 3 In this embodiment, the connecting portion of the folded surface 2 and the bottom surface 1 near the foremost end of the bottom surface 1 is separated. The two sides of the bottom surface 1 at this connecting portion are folded towards the middle of the bottom surface 1 (in this embodiment, the edges of the folded portions along the length of the bottom surface 1 are aligned), so that the two sides of the head 101 of the bottom surface 1 are inclined towards the middle of the bottom surface 1 at inclination angles α1 and α2 (not shown), 0 degrees < α1 < 90 degrees, 0 degrees < α2 < 90 degrees. The sides of the two folded surfaces 2 at this connecting portion that are away from the middle of the bottom surface 1 are folded towards the middle of the bottom surface 1 (the folded portions can be located between the folded surface 2 and the bottom surface 1, or above the folded surface 2). In this embodiment, the folded portion is located between the folded surface 2 and the bottom surface 1, so that the sides of the heads 201 of the two folded surfaces 2 that are away from the middle of the bottom surface 1 are inclined toward the middle of the bottom surface 1 at inclination angles β1 (not shown) and β2, respectively, where 0 degrees < β1 < 90 degrees and 0 degrees < β2 < 90 degrees. The inclination of the two sides of the heads 101 of the bottom surface 1 toward the middle of the bottom surface at 0 degrees to 90 degrees (excluding 0 degrees and 90 degrees) can reduce the width of the heads 101 of the bottom surface 1. The inclination of the sides of the heads 201 of the two folded surfaces 2 that are away from the middle of the bottom surface 1 toward the middle of the bottom surface 1 at 0 degrees to 90 degrees (excluding 0 degrees and 90 degrees) can reduce the overall width of the heads 201 of the two folded surfaces 2.

[0081] refer to Figure 3As long as the width of the head 101 of the bottom surface 1 is less than the width of the non-head 102 of the bottom surface 1, and the overall width of the head 201 of the two folded surfaces 2 is less than the overall width of the non-head 202 of the two folded surfaces 2, the front end of the head 101 of the bottom surface 1 can be pointed or flat, and the front end of the head 201 of the folded surface 2 can be pointed or flat. In this embodiment, the front end of the head 101 of the bottom surface 1 is pointed, and the front end of the head 201 of the folded surface 2 is also pointed.

[0082] refer to Figure 3 The area between the two folded surfaces 2 is flat, which ensures that the pre-folded paper pad will not get stuck on the separation rod in the middle of the inner flow channel of the paper pad forming machine when the paper is fed, thus ensuring smooth paper feeding.

[0083] refer to Figure 3 The pre-folded paper pad of the present invention simultaneously reduces the width of the head 101 of the bottom surface 1 of the pre-folded paper pad and the overall width of the head 201 of the two folding surfaces 2, that is, simultaneously reduces the width of the "upper and lower layers" of the paper feeding head (the foremost front end of the pre-folded paper pad when feeding paper). This results in less friction between the head of the pre-folded paper pad and the inner wall of the flow channel of the paper pad forming machine during paper feeding, reducing the deformation reaction force of the paper material and improving the smoothness of paper feeding. This allows the forming gear at the flow channel outlet of the paper pad forming machine to almost simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding. This allows the upper and lower parts of the inner flow channel of the paper pad forming machine to feed paper simultaneously, ensuring smooth paper feeding, thereby ensuring the smooth forming of the pillow-shaped three-dimensional pad material in the paper pad forming machine.

[0084] The angle range of α1 can be preferentially selected as: 20 degrees ≤ α1 ≤ 70 degrees, the angle range of α2 can be preferentially selected as: 20 degrees ≤ α2 ≤ 70 degrees, the angle range of β1 can be preferentially selected as: 20 degrees ≤ β1 ≤ 70 degrees, and the angle range of β2 can be preferentially selected as: 20 degrees ≤ β2 ≤ 70 degrees. The two sides of the head 101 of the bottom surface 1 are inclined towards the middle of the bottom surface 1 at 20 degrees to 70 degrees, and the side of the head 201 of the folded surface 2 away from the middle of the bottom surface 1 is inclined towards the middle of the bottom surface 1 at 20 degrees to 70 degrees. This can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to realize feeding. In other embodiments, the sum of α1 or α2 and β1 or β2 can also be in the range of: 40 degrees ≤ (α1 + β1) ≤ 140 degrees, 40 degrees ≤ (α1 + β2) ≤ 140 degrees, 40 degrees ≤ (α2 + β1) ≤ 140 degrees, or 40 degrees ≤ (α2 + β2) ≤ 140 degrees. In this way, the angle of inclination of one side of the head 101 of the bottom surface 1 towards the middle of the bottom surface 1 and the angle of inclination of the side of the head 201 of the folded surface 2 away from the middle of the bottom surface 1 towards the middle of the bottom surface 1, totaling 40 degrees to 140 degrees, can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding.

[0085] Example 2:

[0086] Figure 4 The structure of the pre-folded paper pad according to the second embodiment of the present invention is shown schematically.

[0087] refer to Figure 4 The pre-folded paper pad includes a bottom surface 1 and two folding surfaces 2. The two folding surfaces 2 are integrally connected to the two sides of the bottom surface 1, and the two folding surfaces 2 are folded onto the bottom surface 1.

[0088] In this embodiment, the areas pointed to by the head 101 and the non-head 102 of the bottom surface 1 are the same as in Embodiment 1, and the areas pointed to by the head 201 and the non-head 202 of the folded surface 2 are the same as in Embodiment 1, which will not be described again here.

[0089] refer to Figure 4 The width of the head 101 of the bottom surface 1 is less than the width of the non-head 102 of the bottom surface 1. The width of the head 201 of one folded surface 2 is less than the width of the non-head 202 of the folded surface 2. The width of the head 201 of another folded surface 2 is less than the width of the non-head 202 of the folded surface 2. That is, the overall width of the two heads 201 of the two folded surfaces 2 is less than the overall width (sum of widths) of the non-head 202 of the two folded surfaces 2.

[0090] refer to Figure 4In this embodiment, the connecting portion between the folded surface 2 and the bottom surface 1 near the foremost point of the bottom surface 1 is separated. The two sides of the bottom surface 1 at this connecting portion are folded towards the middle of the bottom surface 1 (in this embodiment, the folded portions are stacked together to make the foremost point of the bottom surface 1 pointed), so that the two sides of the head 101 of the bottom surface 1 are inclined towards the middle of the bottom surface 1 at inclination angles α1 and α2 (not shown), 0 degrees < α1 < 90 degrees, 0 degrees < α2 < 90 degrees. The sides of the two folded surfaces 2 located at this connecting portion, away from the middle of the bottom surface 1, are folded towards the middle of the bottom surface 1 (in this embodiment, the folded portions are folded from between the folded surface 2 and the bottom surface 1). Folding the two folded surfaces 2 (to the top of the folded surface 2) so that the sides of the heads 201 of the two folded surfaces 2 away from the middle of the bottom surface 1 are inclined toward the middle of the bottom surface 1 at inclination angles of β1 (not shown) and β2, respectively, where 0 degrees < β1 < 90 degrees and 0 degrees < β2 < 90 degrees. The inclination of the two sides of the heads 101 of the bottom surface 1 toward the middle of the bottom surface at 0 degrees to 90 degrees (excluding 0 degrees and 90 degrees) can reduce the width of the heads 101 of the bottom surface 1. The inclination of the sides of the heads 201 of the two folded surfaces 2 away from the middle of the bottom surface 1 toward the middle of the bottom surface 1 at 0 degrees to 90 degrees (excluding 0 degrees and 90 degrees) can reduce the overall width of the heads 201 of the two folded surfaces 2.

[0091] refer to Figure 4 As long as the width of the head 101 of the bottom surface 1 is less than the width of the non-head 102 of the bottom surface 1, and the overall width of the head 201 of the two folded surfaces 2 is less than the overall width of the non-head 202 of the two folded surfaces 2, the front end of the head 101 of the bottom surface 1 can be pointed or flat, and the front end of the head 201 of the folded surface 2 can be pointed or flat. In this embodiment, the front end of the head 101 of the bottom surface 1 is pointed, and the front end of the head 201 of the folded surface 2 is also pointed.

[0092] refer to Figure 4 The area between the two folded surfaces 2 is flat, which ensures that the pre-folded paper pad will not get stuck on the separation rod in the middle of the inner flow channel of the paper pad forming machine when the paper is fed, thus ensuring smooth paper feeding.

[0093] refer to Figure 4The pre-folded paper pad of the present invention simultaneously reduces the width of the head 101 of the bottom surface 1 of the pre-folded paper pad and the overall width of the head 201 of the two folding surfaces 2, that is, simultaneously reduces the width of the "upper and lower layers" of the paper feeding head (the foremost front end of the pre-folded paper pad when feeding paper). This results in less friction between the head of the pre-folded paper pad and the inner wall of the flow channel of the paper pad forming machine during paper feeding, reducing the deformation reaction force of the paper material and improving the smoothness of paper feeding. This allows the forming gear at the flow channel outlet of the paper pad forming machine to almost simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding. This allows the upper and lower parts of the inner flow channel of the paper pad forming machine to feed paper simultaneously, ensuring smooth paper feeding, thereby ensuring the smooth forming of the pillow-shaped three-dimensional pad material in the paper pad forming machine.

[0094] The angle range of α1 can be preferentially selected as: 20 degrees ≤ α1 ≤ 70 degrees, 20 degrees ≤ α2 ≤ 70 degrees, the angle range of β1 can be preferentially selected as: 20 degrees ≤ β1 ≤ 70 degrees, the angle range of β2 can be preferentially selected as: 20 degrees ≤ β2 ≤ 70 degrees. The two sides of the head 101 of the bottom surface 1 are inclined towards the middle of the bottom surface 1 at 20 degrees to 70 degrees, and the side of the head 201 of the folded surface 2 away from the middle of the bottom surface 1 is inclined towards the middle of the bottom surface 1 at 20 degrees to 70 degrees. This can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to realize feeding. In other embodiments, the sum of α1 or α2 and β1 or β2 can also be in the range of: 40 degrees ≤ (α1 + β1) ≤ 140 degrees, 40 degrees ≤ (α1 + β2) ≤ 140 degrees, 40 degrees ≤ (α2 + β1) ≤ 140 degrees, or 40 degrees ≤ (α2 + β2) ≤ 140 degrees. In this way, the angle of inclination of one side of the head 101 of the bottom surface 1 towards the middle of the bottom surface 1 and the angle of inclination of the side of the head 201 of the folded surface 2 away from the middle of the bottom surface 1 towards the middle of the bottom surface 1, totaling 40 degrees to 140 degrees, can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding.

[0095] Example 3:

[0096] Figure 5 The structure of the pre-folded paper pad according to the third embodiment of the present invention is shown schematically.

[0097] refer to Figure 5 The pre-folded paper pad includes a bottom surface 1 and two folding surfaces 2. The two folding surfaces 2 are integrally connected to the two sides of the bottom surface 1, and the two folding surfaces 2 are folded onto the bottom surface 1.

[0098] In this embodiment, the areas pointed to by the head 101 and the non-head 102 of the bottom surface 1 are the same as in Embodiment 1, and the areas pointed to by the head 201 and the non-head 202 of the folded surface 2 are the same as in Embodiment 1, which will not be described again here.

[0099] refer to Figure 5 The width of the head 101 of the bottom surface 1 is less than the width of the non-head 102 of the bottom surface 1. The width of the head 201 of one folded surface 2 is less than the width of the non-head 202 of the folded surface 2. The width of the head 201 of another folded surface 2 is less than the width of the non-head 202 of the folded surface 2. That is, the overall width of the two heads 201 of the two folded surfaces 2 is less than the overall width (sum of widths) of the non-head 202 of the two folded surfaces 2.

[0100] refer to Figure 5 In this embodiment, the front end of the head 101 of the bottom surface 1 is flat-headed, and the front end of the head 201 of the folded surface 2 is also flat-headed.

[0101] refer to Figure 5 In this embodiment, the connecting portion between the folded surface 2 and the bottom surface 1 near the foremost point of the bottom surface 1 is separated. The two sides of the bottom surface 1 at this connecting portion are folded towards the middle of the bottom surface 1 (in this embodiment, the folded portions are stacked together so that the foremost point of the head 101 of the bottom surface 1 is flat), causing the two sides of the head 101 of the bottom surface 1 to tilt towards the middle of the bottom surface 1 at tilt angles α1 and α2 (not shown), where 0 degrees < α1 < 90 degrees and 0 degrees < α2 < 90 degrees. The sides of the two folded surfaces 2 located at this connecting portion, away from the middle of the bottom surface 1, are folded towards the middle of the bottom surface 1 (in this embodiment, the folded portions are folded from the folded surface 2 and the bottom surface...). Fold the two folded surfaces 101 together to the top of the folded surface 2, so that the sides of the heads 201 of the two folded surfaces 2 away from the middle of the bottom surface 1 are inclined toward the middle of the bottom surface 1 at inclination angles β1 (not shown) and β2 respectively, 0 degrees < β1 < 90 degrees, 0 degrees < β2 < 90 degrees. The inclination of the two sides of the heads 101 of the bottom surface 1 toward the middle of the bottom surface by 0 degrees to 90 degrees (excluding 0 degrees and 90 degrees) can reduce the width of the heads 101 of the bottom surface 1. The inclination of the sides of the heads 201 of the two folded surfaces 2 away from the middle of the bottom surface 1 toward the middle of the bottom surface 1 by 0 degrees to 90 degrees (excluding 0 degrees and 90 degrees) can reduce the overall width of the heads 201 of the two folded surfaces 2.

[0102] refer to Figure 5 The area between the two folded surfaces 2 is flat, which ensures that the pre-folded paper pad will not get stuck on the separation rod in the middle of the inner flow channel of the paper pad forming machine when the paper is fed, thus ensuring smooth paper feeding.

[0103] refer to Figure 5The pre-folded paper pad of the present invention simultaneously reduces the width of the head 101 of the bottom surface 1 of the pre-folded paper pad and the overall width of the head 201 of the two folding surfaces 2, that is, simultaneously reduces the width of the "upper and lower layers" of the paper feeding head (the foremost front end of the pre-folded paper pad when feeding paper). This results in less friction between the head of the pre-folded paper pad and the inner wall of the flow channel of the paper pad forming machine during paper feeding, reducing the deformation reaction force of the paper material and improving the smoothness of paper feeding. This allows the forming gear at the flow channel outlet of the paper pad forming machine to almost simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding. This allows the upper and lower parts of the inner flow channel of the paper pad forming machine to feed paper simultaneously, ensuring smooth paper feeding, thereby ensuring the smooth forming of the pillow-shaped three-dimensional pad material in the paper pad forming machine.

[0104] The angle range of α1 can be preferentially selected as: 20 degrees ≤ α1 ≤ 70 degrees, the angle range of α2 can be preferentially selected as: 20 degrees ≤ α2 ≤ 70 degrees, the angle range of β1 can be preferentially selected as: 20 degrees ≤ β1 ≤ 70 degrees, and the angle range of β2 can be preferentially selected as: 20 degrees ≤ β2 ≤ 70 degrees. The two sides of the head 101 of the bottom surface 1 are inclined towards the middle of the bottom surface 1 at 20 degrees to 70 degrees, and the side of the head 201 of the folded surface 2 away from the middle of the bottom surface 1 is inclined towards the middle of the bottom surface 1 at 20 degrees to 70 degrees. This can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to realize feeding. In other embodiments, the sum of α1 or α2 and β1 or β2 can also be in the range of: 40 degrees ≤ (α1 + β1) ≤ 140 degrees, 40 degrees ≤ (α1 + β2) ≤ 140 degrees, 40 degrees ≤ (α2 + β1) ≤ 140 degrees, or 40 degrees ≤ (α2 + β2) ≤ 140 degrees. In this way, the angle of inclination of one side of the head 101 of the bottom surface 1 towards the middle of the bottom surface 1 and the angle of inclination of the side of the head 201 of the folded surface 2 away from the middle of the bottom surface 1 towards the middle of the bottom surface 1, totaling 40 degrees to 140 degrees, can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding.

[0105] Example 4:

[0106] Figure 6 The structure of the pre-folded paper pad according to the fourth embodiment of the present invention is shown schematically.

[0107] refer to Figure 6 The pre-folded paper pad includes a bottom surface 1 and two folding surfaces 2. The two folding surfaces 2 are integrally connected to the two sides of the bottom surface 1, and the two folding surfaces 2 are folded onto the bottom surface 1.

[0108] In this embodiment, the areas pointed to by the head 101 and the non-head 102 of the bottom surface 1 are the same as in Embodiment 1, and the areas pointed to by the head 201 and the non-head 202 of the folded surface 2 are the same as in Embodiment 1, which will not be described again here.

[0109] refer to Figure 6 The width of the head 101 of the bottom surface 1 is less than the width of the non-head 102 of the bottom surface 1. The width of the head 201 of one folded surface 2 is less than the width of the non-head 202 of the folded surface 2. The width of the head 201 of another folded surface 2 is less than the width of the non-head 202 of the folded surface 2. That is, the overall width of the two heads 201 of the two folded surfaces 2 is less than the overall width (sum of widths) of the non-head 202 of the two folded surfaces 2.

[0110] refer to Figure 6 In this embodiment, the connecting portion of the folded surface 2 and the bottom surface 1 near the foremost end of the bottom surface 1 is separated. The two sides of the bottom surface 1 located at this connecting portion are folded towards the middle of the bottom surface 1 (in this embodiment, the folded portion is cut off; in other embodiments, the edges of the folded portion along the length direction of the bottom surface 1 are aligned), so that the two sides of the head 101 of the bottom surface 1 are inclined towards the middle of the bottom surface 1 at inclination angles α1 and α2 (not shown), 0 degrees < α1 < 90 degrees, 0 degrees < α2 < 90 degrees. The sides of the two folded surfaces 2 located at this connecting portion that are away from the middle of the bottom surface 1 are folded towards the middle of the bottom surface 1 (in this embodiment, the folded portion is cut off; in other embodiments, the folded portion is aligned). The two folds can be located between the folded surface 2 and the bottom surface 1, or above the folded surface 2, so that the sides of the heads 201 of the two folded surfaces 2 away from the middle of the bottom surface 1 are inclined toward the middle of the bottom surface 1 with inclination angles of β1 (not shown) and β2 respectively, 0 degrees < β1 < 90 degrees, 0 degrees < β2 < 90 degrees. The inclination of the two sides of the heads 101 of the bottom surface 1 toward the middle of the bottom surface by 0 degrees to 90 degrees (excluding 0 degrees and 90 degrees) can reduce the width of the heads 101 of the bottom surface 1. The inclination of the sides of the heads 201 of the two folded surfaces 2 away from the middle of the bottom surface 1 toward the middle of the bottom surface 1 by 0 degrees to 90 degrees (excluding 0 degrees and 90 degrees) can reduce the overall width of the heads 201 of the two folded surfaces 2.

[0111] refer to Figure 6 In this embodiment, the foremost point of the head 101 of the bottom surface 1 is pointed, and the foremost points of the heads 201 of the two folded surfaces 2 are flat. The heads 201 of the folded surfaces 2 can be flattened by a cutting machine or other cutting device. In order to ensure that the forming gear at the outlet of the paper pad forming machine can clamp the paper of the "upper and lower layers" of the pre-folded paper pad feed head almost simultaneously, the area of ​​the head 201 of the folded surface 2 that is cut should not be too large, and it is sufficient to slightly expose the head 101 of the bottom surface 1.

[0112] refer to Figure 6The area between the two folded surfaces 2 is flat, which ensures that the pre-folded paper pad will not get stuck on the separation rod in the middle of the inner flow channel of the paper pad forming machine when the paper is fed, thus ensuring smooth paper feeding.

[0113] refer to Figure 6 The pre-folded paper pad of the present invention simultaneously reduces the width of the head 101 of the bottom surface 1 of the pre-folded paper pad and the overall width of the head 201 of the two folding surfaces 2, that is, simultaneously reduces the width of the "upper and lower layers" of the paper feeding head (the foremost front end of the pre-folded paper pad when feeding paper). This results in less friction between the head of the pre-folded paper pad and the inner wall of the flow channel of the paper pad forming machine during paper feeding, reducing the deformation reaction force of the paper material and improving the smoothness of paper feeding. This allows the forming gear at the flow channel outlet of the paper pad forming machine to almost simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding. This allows the upper and lower parts of the inner flow channel of the paper pad forming machine to feed paper simultaneously, ensuring smooth paper feeding, thereby ensuring the smooth forming of the pillow-shaped three-dimensional pad material in the paper pad forming machine.

[0114] The angle range of α1 can be preferentially selected as: 20 degrees ≤ α1 ≤ 70 degrees, the angle range of α2 can be preferentially selected as: 20 degrees ≤ α2 ≤ 70 degrees, the angle range of β1 can be preferentially selected as: 20 degrees ≤ β1 ≤ 70 degrees, and the angle range of β2 can be preferentially selected as: 20 degrees ≤ β2 ≤ 70 degrees. The two sides of the head 101 of the bottom surface 1 are inclined towards the middle of the bottom surface 1 at 20 degrees to 70 degrees, and the side of the head 201 of the folded surface 2 away from the middle of the bottom surface 1 is inclined towards the middle of the bottom surface 1 at 20 degrees to 70 degrees. This can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to realize feeding. In other embodiments, the sum of α1 or α2 and β1 or β2 can also be in the range of: 40 degrees ≤ (α1 + β1) ≤ 140 degrees, 40 degrees ≤ (α1 + β2) ≤ 140 degrees, 40 degrees ≤ (α2 + β1) ≤ 140 degrees, or 40 degrees ≤ (α2 + β2) ≤ 140 degrees. In this way, the angle of inclination of one side of the head 101 of the bottom surface 1 towards the middle of the bottom surface 1 and the angle of inclination of the side of the head 201 of the folded surface 2 away from the middle of the bottom surface 1 towards the middle of the bottom surface 1, totaling 40 degrees to 140 degrees, can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding.

[0115] Example 5:

[0116] Figure 7 The structure of the pre-folded paper pad according to the fifth embodiment of the present invention is shown schematically.

[0117] refer to Figure 7 The pre-folded paper pad includes a bottom surface 1 and two folding surfaces 2. The two folding surfaces 2 are integrally connected to the two sides of the bottom surface 1, and the two folding surfaces 2 are folded onto the bottom surface 1.

[0118] In this embodiment, the areas pointed to by the head 101 and the non-head 102 of the bottom surface 1 are the same as in Embodiment 1, and the areas pointed to by the head 201 and the non-head 202 of the folded surface 2 are the same as in Embodiment 1, which will not be described again here.

[0119] refer to Figure 7 The width of the head 101 of the bottom surface 1 is less than the width of the non-head 102 of the bottom surface 1. The width of the head 201 of one folded surface 2 is less than the width of the non-head 202 of the folded surface 2. The width of the head 201 of another folded surface 2 is less than the width of the non-head 202 of the folded surface 2. That is, the overall width of the two heads 201 of the two folded surfaces 2 is less than the overall width (sum of widths) of the non-head 202 of the two folded surfaces 2.

[0120] refer to Figure 7 In this embodiment, the connecting portion of the folded surface 2 and the bottom surface 1 near the foremost end of the bottom surface 1 is separated. The two sides of the bottom surface 1 located at this connecting portion are folded towards the middle of the bottom surface 1 (in this embodiment, the folded portion is cut off; in other embodiments, the edges of the folded portion along the length direction of the bottom surface 1 are aligned), so that the two sides of the head 101 of the bottom surface 1 are inclined towards the middle of the bottom surface 1 at inclination angles α1 and α2 (not shown), 0 degrees < α1 < 90 degrees, 0 degrees < α2 < 90 degrees. The sides of the two folded surfaces 2 located at this connecting portion that are away from the middle of the bottom surface 1 are folded towards the middle of the bottom surface 1 (in this embodiment, the folded portion is cut off; in other embodiments, the folded portion is aligned). The two folds can be located between the folded surface 2 and the bottom surface 1, or above the folded surface 2, so that the sides of the heads 201 of the two folded surfaces 2 away from the middle of the bottom surface 1 are inclined toward the middle of the bottom surface 1 with inclination angles of β1 (not shown) and β2 respectively, 0 degrees < β1 < 90 degrees, 0 degrees < β2 < 90 degrees. The inclination of the two sides of the heads 101 of the bottom surface 1 toward the middle of the bottom surface by 0 degrees to 90 degrees (excluding 0 degrees and 90 degrees) can reduce the width of the heads 101 of the bottom surface 1. The inclination of the sides of the heads 201 of the two folded surfaces 2 away from the middle of the bottom surface 1 toward the middle of the bottom surface 1 by 0 degrees to 90 degrees (excluding 0 degrees and 90 degrees) can reduce the overall width of the heads 201 of the two folded surfaces 2.

[0121] refer to Figure 7In this embodiment, the front end of the head 101 of the bottom surface 1 is flat-headed, and the front ends of the heads 201 of the two folded surfaces 2 are also flat-headed. The front end of the head 101 of the bottom surface 1 can be formed into a flat-headed shape by a cutting machine or other cutting device, and the front end of the head 201 of the folded surface 2 can be formed into a flat-headed shape by a cutting machine or other cutting device.

[0122] refer to Figure 7 The area between the two folded surfaces 2 is flat, which ensures that the pre-folded paper pad will not get stuck on the separation rod in the middle of the inner flow channel of the paper pad forming machine when the paper is fed, thus ensuring smooth paper feeding.

[0123] refer to Figure 7 The pre-folded paper pad of the present invention simultaneously reduces the width of the head 101 of the bottom surface 1 of the pre-folded paper pad and the overall width of the head 201 of the two folding surfaces 2, that is, simultaneously reduces the width of the "upper and lower layers" of the paper feeding head (the foremost front end of the pre-folded paper pad when feeding paper). This results in less friction between the head of the pre-folded paper pad and the inner wall of the flow channel of the paper pad forming machine during paper feeding, reducing the deformation reaction force of the paper material and improving the smoothness of paper feeding. This allows the forming gear at the flow channel outlet of the paper pad forming machine to almost simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding. This allows the upper and lower parts of the inner flow channel of the paper pad forming machine to feed paper simultaneously, ensuring smooth paper feeding, thereby ensuring the smooth forming of the pillow-shaped three-dimensional pad material in the paper pad forming machine.

[0124] The angle range of α1 can be preferentially selected as: 20 degrees ≤ α1 ≤ 70 degrees, the angle range of α2 can be preferentially selected as: 20 degrees ≤ α2 ≤ 70 degrees, the angle range of β1 can be preferentially selected as: 20 degrees ≤ β1 ≤ 70 degrees, and the angle range of β2 can be preferentially selected as: 20 degrees ≤ β2 ≤ 70 degrees. The two sides of the head 101 of the bottom surface 1 are inclined towards the middle of the bottom surface 1 at 20 degrees to 70 degrees, and the side of the head 201 of the folded surface 2 away from the middle of the bottom surface 1 is inclined towards the middle of the bottom surface 1 at 20 degrees to 70 degrees. This can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to realize feeding. In other embodiments, the sum of α1 or α2 and β1 or β2 can also be in the range of: 40 degrees ≤ (α1 + β1) ≤ 140 degrees, 40 degrees ≤ (α1 + β2) ≤ 140 degrees, 40 degrees ≤ (α2 + β1) ≤ 140 degrees, or 40 degrees ≤ (α2 + β2) ≤ 140 degrees. In this way, the angle of inclination of one side of the head 101 of the bottom surface 1 towards the middle of the bottom surface 1 and the angle of inclination of the side of the head 201 of the folded surface 2 away from the middle of the bottom surface 1 towards the middle of the bottom surface 1, totaling 40 degrees to 140 degrees, can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding.

[0125] Example 6:

[0126] Figure 8 The structure of the pre-folded paper pad according to the sixth embodiment of the present invention is shown schematically.

[0127] refer to Figure 8 The pre-folded paper pad includes a bottom surface 1 and two folding surfaces 2. The two folding surfaces 2 are integrally connected to the two sides of the bottom surface 1, and the two folding surfaces 2 are folded onto the bottom surface 1.

[0128] refer to Figure 8 The head 101 of the bottom surface 1 refers to Figure 8 A portion of the front end of the bottom surface 1 with a length of L1; the non-head 102 of the bottom surface 1 refers to the area of ​​the bottom surface 1 excluding the head 101; the head 201 of the folded surface 2 refers to... Figure 8 A portion of the front end of the folded surface 2 with a length of L1, the non-head 202 of the folded surface 2 refers to the area of ​​the folded surface 2 excluding the head 201.

[0129] refer to Figure 8The width of the head 101 of the bottom surface 1 is less than the width of the non-head 102 of the bottom surface 1. The width of the head 201 of one folded surface 2 is less than the width of the non-head 202 of the folded surface 2. The width of the head 201 of another folded surface 2 is less than the width of the non-head 202 of the folded surface 2. That is, the overall width of the two heads 201 of the two folded surfaces 2 is less than the overall width (sum of widths) of the non-head 202 of the two folded surfaces 2.

[0130] refer to Figure 8 In this embodiment, the connection between the folded surface 2 and the bottom surface 1 near the foremost point of the bottom surface 1 is separated. The two connection points between the head 101 and the non-head 102 of the bottom surface 1 are separated, and the separation area starts from both sides of the bottom surface 1 towards the middle of the bottom surface 1. The two sides of the bottom surface 1 near the foremost point of the bottom surface 1 are folded towards the middle of the bottom surface 1 to reduce the width of the head 101 of the bottom surface 1. The connection point between the head 201 and the non-head 202 of the folded surface 2 is also separated, and the separation area starts from the side of the folded surface 2 away from the middle of the bottom surface 1 and extends towards the foremost point of the bottom surface 1. One end of the folded surface 2 is folded towards the middle of the bottom surface 1 to reduce the width of the head 201 of the folded surface 2. The connection between the head 201 of the other folded surface 2 and the non-head 202 of the folded surface 2 is also separated, and the separation area starts from the side of the folded surface 2 away from the middle of the bottom surface 1. The folded surface 2 near the front end of the bottom surface 1 can be folded towards the middle of the bottom surface 1 to reduce the width of the head 201 of the folded surface 2, thereby reducing the overall width of the heads 201 of the two folded surfaces 2. Preferably, the width of the head 101 of the bottom surface 1 is equivalent to the overall width of the heads 201 of the two folded surfaces 2.

[0131] refer to Figure 8 In this embodiment, the front end of the head 101 of the bottom surface 1 is flat-headed, and the front ends of the heads 201 of the two folded surfaces 2 are also flat-headed.

[0132] refer to Figure 8 The area between the two folded surfaces 2 is flat, which ensures that the pre-folded paper pad will not get stuck on the separation rod in the middle of the inner flow channel of the paper pad forming machine when the paper is fed, thus ensuring smooth paper feeding.

[0133] refer to Figure 8The pre-folded paper pad of the present invention simultaneously reduces the width of the head 101 of the bottom surface 1 of the pre-folded paper pad and the overall width of the head 201 of the two folding surfaces 2, that is, simultaneously reduces the width of the "upper and lower layers" of the paper feeding head (the foremost front end of the pre-folded paper pad when feeding paper). This results in less friction between the head of the pre-folded paper pad and the inner wall of the flow channel of the paper pad forming machine during paper feeding, reducing the deformation reaction force of the paper material and improving the smoothness of paper feeding. This allows the forming gear at the flow channel outlet of the paper pad forming machine to almost simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding. This allows the upper and lower parts of the inner flow channel of the paper pad forming machine to feed paper simultaneously, ensuring smooth paper feeding, thereby ensuring the smooth forming of the pillow-shaped three-dimensional pad material in the paper pad forming machine.

[0134] Example 7:

[0135] Figure 9 The structure of the pre-folded paper pad according to the seventh embodiment of the present invention is shown schematically.

[0136] refer to Figure 9 The pre-folded paper pad includes a bottom surface 1 and two folding surfaces 2. The two folding surfaces 2 are integrally connected to the two sides of the bottom surface 1, and the two folding surfaces 2 are folded onto the bottom surface 1.

[0137] refer to Figure 9 The head 101 of the bottom surface 1 refers to Figure 9 A portion of the front end of the bottom surface 1 with a length of L2; the non-head 102 of the bottom surface 1 refers to the area of ​​the bottom surface 1 excluding the head 101; the head 201 of the folded surface 2 refers to... Figure 9 A portion of the front end of the folded surface 2 with a length of L2, the non-head 202 of the folded surface 2 refers to the area of ​​the folded surface 2 excluding the head 201.

[0138] refer to Figure 9 The width of the head 101 of the bottom surface 1 is less than the width of the non-head 102 of the bottom surface 1. The width of the head 201 of one folded surface 2 is less than the width of the non-head 202 of the folded surface 2. The width of the head 201 of another folded surface 2 is less than the width of the non-head 202 of the folded surface 2. That is, the overall width of the two heads 201 of the two folded surfaces 2 is less than the overall width (sum of widths) of the non-head 202 of the two folded surfaces 2.

[0139] refer to Figure 9In this embodiment, the head 101 of the bottom surface 1 is trapezoidal in shape. The maximum width of the head 101 of the bottom surface 1 (the width of the front end of the head 101 of the bottom surface 1) is less than the width of the non-head 102 of the bottom surface 1. In this embodiment, the two sides of the head 101 of the bottom surface 1 are inclined from the front end of the bottom surface 1 toward the middle of the bottom surface 1 with inclination angles of γ1 and γ2 (not shown), respectively, 0 degrees < γ1 < 90 degrees, 0 degrees < γ2 < 90 degrees. The heads 201 of the two folded surfaces 2 are both trapezoidal in shape. The two folded surfaces 2 are trapezoidal in shape together. The sides of the two folded surfaces 2 away from the middle of the bottom surface 1 are inclined from the front end of the folded surfaces 2 toward the middle of the bottom surface 1 with inclination angles of θ1 (not shown) and θ2, respectively, 0 degrees < θ1 < 90 degrees, 0 degrees < θ2 < 90 degrees.

[0140] In this embodiment, the shape and size of the head 101 of the bottom surface 1 are the same as the overall shape and size of the head 201 of the two folded surfaces 2.

[0141] refer to Figure 9 In this embodiment, the front end of the head 101 of the bottom surface 1 is flat-headed, and the front ends of the heads 201 of the two folded surfaces 2 are also flat-headed.

[0142] refer to Figure 9 The area between the two folded surfaces 2 is flat, which ensures that the pre-folded paper pad will not get stuck on the separation rod in the middle of the inner flow channel of the paper pad forming machine when the paper is fed, thus ensuring smooth paper feeding.

[0143] refer to Figure 9 The pre-folded paper pad of the present invention simultaneously reduces the width of the head 101 of the bottom surface 1 of the pre-folded paper pad and the overall width of the head 201 of the two folding surfaces 2, that is, simultaneously reduces the width of the "upper and lower layers" of the paper feeding head (the foremost front end of the pre-folded paper pad when feeding paper). This results in less friction between the head of the pre-folded paper pad and the inner wall of the flow channel of the paper pad forming machine during paper feeding, reducing the deformation reaction force of the paper material and improving the smoothness of paper feeding. This allows the forming gear at the flow channel outlet of the paper pad forming machine to almost simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding. This allows the upper and lower parts of the inner flow channel of the paper pad forming machine to feed paper simultaneously, ensuring smooth paper feeding, thereby ensuring the smooth forming of the pillow-shaped three-dimensional pad material in the paper pad forming machine.

[0144] The angle range of γ1 can be preferentially selected as: 20 degrees ≤ γ1 ≤ 70 degrees, the angle range of γ2 can be preferentially selected as: 20 degrees ≤ γ2 ≤ 70 degrees, the angle range of θ1 can be preferentially selected as: 20 degrees ≤ θ1 ≤ 70 degrees, and the angle range of θ2 can be preferentially selected as: 20 degrees ≤ θ2 ≤ 70 degrees. The two sides of the head 101 of the bottom surface 1 are inclined towards the middle of the bottom surface 1 at 20 degrees to 70 degrees, and the side of the head 201 of the folded surface 2 away from the middle of the bottom surface 1 is inclined towards the middle of the bottom surface 1 at 20 degrees to 70 degrees. This can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to realize feeding. In other embodiments, the sum of γ1 or γ2 and θ1 or θ2 can also be in the range of: 40 degrees ≤ (γ1 + θ1) ≤ 140 degrees, 40 degrees ≤ (γ1 + θ2) ≤ 140 degrees, 40 degrees ≤ (γ2 + θ1) ≤ 140 degrees, or 40 degrees ≤ (γ2 + θ2) ≤ 140 degrees. In this way, the angle of inclination of one side of the head 101 of the bottom surface 1 towards the middle of the bottom surface 1 and the angle of inclination of the side of the head 201 of the folded surface 2 away from the middle of the bottom surface 1 towards the middle of the bottom surface 1, totaling 40 degrees to 140 degrees, can ensure that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding.

[0145] Figure 10 The structure of the pre-folded paper pad according to the eighth embodiment of the present invention is shown schematically.

[0146] refer to Figure 10 The pre-folded paper pad includes a bottom surface 1 and two folding surfaces 2. The two folding surfaces 2 are integrally connected to the two sides of the bottom surface 1, and the two folding surfaces 2 are folded onto the bottom surface 1.

[0147] refer to Figure 10 The head 101 of the bottom surface 1 refers to Figure 10 A portion of the front end of the bottom surface 1 with a length of L3; the non-head 102 of the bottom surface 1 refers to the area of ​​the bottom surface 1 excluding the head 101; the head 201 of the folded surface 2 refers to... Figure 10 A portion of the front end of the folded surface 2 with a length of L3, the non-head 202 of the folded surface 2 refers to the area of ​​the folded surface 2 excluding the head 201.

[0148] refer to Figure 10The head 101 of the bottom surface 1 is square in shape, and the width of the head 101 of the bottom surface 1 is smaller than the width of the non-head 102 of the bottom surface 1. The head 201 of the folded surface 2 is square in shape. The width of the head 201 of one folded surface 2 is smaller than the width of the non-head 202 of the same folded surface 2, and the width of the head 201 of the other folded surface 2 is smaller than the width of the non-head 202 of the same folded surface 2. That is, the overall width of the two heads 201 of the two folded surfaces 2 is smaller than the overall width (sum of widths) of the non-head 202 of the two folded surfaces 2.

[0149] In this embodiment, the shape and size of the head 101 of the bottom surface 1 are the same as the overall shape and size of the head 201 of the two folded surfaces 2.

[0150] refer to Figure 10 The area between the two folded surfaces 2 is flat, which ensures that the pre-folded paper pad will not get stuck on the separation rod in the middle of the inner flow channel of the paper pad forming machine when the paper is fed, thus ensuring smooth paper feeding.

[0151] refer to Figure 10 The pre-folded paper pad of the present invention simultaneously reduces the width of the head 101 of the bottom surface 1 of the pre-folded paper pad and the overall width of the head 201 of the two folding surfaces 2, that is, simultaneously reduces the width of the "upper and lower layers" of the paper feeding head (the foremost front end of the pre-folded paper pad when feeding paper). This results in less friction between the head of the pre-folded paper pad and the inner wall of the flow channel of the paper pad forming machine during paper feeding, reducing the deformation reaction force of the paper material and improving the smoothness of paper feeding. This allows the forming gear at the flow channel outlet of the paper pad forming machine to almost simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feeding head, and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feeding head to achieve feeding. This allows the upper and lower parts of the inner flow channel of the paper pad forming machine to feed paper simultaneously, ensuring smooth paper feeding, thereby ensuring the smooth forming of the pillow-shaped three-dimensional pad material in the paper pad forming machine.

[0152] Figure 11 The diagram schematically illustrates the state of the pre-folded paper pad and the flow channel assembly according to one embodiment of the present invention.

[0153] Taking the pre-folded paper pad in Example 5 as an example, in this example, refer to... Figure 11 The width of the outlet of the flow channel 3 of the paper pad forming machine suitable for pre-folded paper pads is A. The width of the frontmost point of the bottom surface 1 of the pre-folded paper pad is greater than or equal to zero and less than or equal to 1.2A. The overall width of the frontmost point of the two folded surfaces 2 is greater than or equal to zero and less than or equal to 1.2A. The width of the frontmost point of the bottom surface 1 and the overall width of the frontmost point of the two folded surfaces 2 are slightly greater than the width A of the outlet of the flow channel 3 to ensure smooth paper feeding. It is advisable that the width of the frontmost point of the bottom surface 1 and the overall width of the frontmost point of the two folded surfaces 2 do not exceed 1.2 times the width A of the outlet of the flow channel 3.

[0154] In this embodiment, reference Figure 11 The flow channel 3 of the paper pad forming machine suitable for pre-folded paper pads converges from bottom to top and from both sides towards the middle. The convergence angle of one side wall of the flow channel 3 is B1, and the convergence angle of the other side wall of the flow channel 3 is B2. 0 degrees ≤ (the sum of the inclination angles of the two sides of the head of the pre-folded paper pad towards the middle of the bottom surface 1) ≤ (B1 + B2 + 30 degrees), 0 degrees ≤ (the sum of the inclination angles of the sides of the two folded surfaces 2 of the pre-folded paper pad away from the middle of the bottom surface 1 towards the middle of the bottom surface 1) ≤ (B1 + B2 + 30 degrees). That is, even when the convergence amplitude of the head of the pre-folded paper pad is slightly greater than the convergence amplitude of the two side walls of the flow channel 3, smooth paper feeding can still be ensured. The sum of the angles at which the two sides of the head converge toward the middle should not exceed (B1+B2+30 degrees). Taking the pre-folded paper pads in Embodiments 6 and 8 as examples, the two sides of the head 101 of the bottom surface 1 of the pre-folded paper pad are parallel to the two sides of the non-head 102 of the bottom surface 1, so the sum of the angles at which the two sides of the head 101 of the bottom surface 1 of the pre-folded paper pad converge toward the middle of the bottom surface 1 is 0. The side of the head 201 of the folded surface 2 of the pre-folded paper pad away from the middle of the bottom surface 1 is parallel to the side of the non-head 202 of the folded surface 2, so the sum of the angles at which the side of the head 201 of the folded surface 2 of the pre-folded paper pad away from the middle of the bottom surface 1 converges toward the middle of the bottom surface 1 is also 0.

[0155] Figure 12 The diagram schematically illustrates the flow of a method for feeding a pre-folded paper pad according to one embodiment of the present invention.

[0156] The pre-folded paper pad includes a bottom surface and two folding surfaces. The two folding surfaces are integrally connected to the two sides of the bottom surface, and the two folding surfaces are folded onto the bottom surface.

[0157] refer to Figure 12 A method for feeding pre-folded paper pads includes the following steps:

[0158] S101: Process the head of the pre-folded paper pad so that the width of the head of the bottom surface of the pre-folded paper pad is less than the width of the non-head of the bottom surface, and make the overall width of the head of the two folded surfaces of the pre-folded paper pad less than the overall width of the non-head of the two folded surfaces.

[0159] The head of the pre-folded paper pad can be processed as follows: First, cut open the connecting part between the folded surface and the bottom surface near the foremost point of the bottom surface. Then, fold both sides of the head of the bottom surface towards the middle of the bottom surface (or cut off the folded part using a cutting machine or other cutting device) so that the two sides of the head of the bottom surface are inclined towards the middle of the bottom surface at inclination angles α1 and α2 respectively. Fold the side of the head of the folded surface away from the middle of the bottom surface towards the middle of the bottom surface (or cut off the folded part using a cutting machine or other cutting device) so that the side of the head of the folded surface away from the middle of the bottom surface is inclined towards the middle of the bottom surface at inclination angles β1 and β2 respectively, wherein 0 degrees < α1 < 90 degrees, 0 degrees < α2 < 90 degrees, 0 degrees < β1 < 90 degrees, 0 degrees < β2 < 90 degrees, preferably 20 degrees ≤ α1 ≤ 70 degrees, 20 degrees ≤ α2 ≤ 70 degrees, preferably 20 degrees ≤ α1 ≤ 70 degrees, preferably 20 degrees ≤ α2 ≤ 70 degrees. The following conditions must be met: α1 ≤ 70 degrees, 20 degrees ≤ β2 ≤ 70 degrees, or 40 degrees ≤ (α1 or α2 + β1 or β2) ≤ 140 degrees. The inclination of the two sides of the bottom head towards the middle of the bottom surface by 20 degrees to 70 degrees, and the inclination of the side of the folded surface head away from the middle of the bottom surface towards the middle of the bottom surface by 20 degrees to 70 degrees, ensures that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feed head and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feed head to achieve feeding. Alternatively, the combined inclination angle of one side of the bottom head towards the middle of the bottom surface and the inclination angle of the side of the folded surface head away from the middle of the bottom surface towards the middle of the bottom surface, totaling 40 degrees to 140 degrees, ensures that the forming gear of the paper pad forming machine can simultaneously clamp the paper of the "upper and lower layers" of the pre-folded paper pad feed head and simultaneously pull the "upper and lower layers" of the pre-folded paper pad feed head to achieve feeding.

[0160] The head of the pre-folded paper pad can also be processed as follows: First, cut open the connecting part between the folded surface and the bottom surface near the front end of the bottom surface. Then, cut open the two connecting parts between the head and the non-head of the bottom surface, with the cutting area starting from both sides of the bottom surface towards the middle. Next, cut open the connecting part between the head and the non-head of one folded surface, with the cutting area starting from the side of the folded surface away from the middle of the bottom surface. At the same time, cut open the connecting part between the head and the non-head of another folded surface, with the cutting area starting from the side of the folded surface away from the middle of the bottom surface. Then, fold the two sides of the head of the bottom surface towards the middle of the bottom surface (or cut off the folded part using a cutting machine or other cutting device). Fold the side of the head of the folded surface away from the middle of the bottom surface towards the middle of the bottom surface (or cut off the folded part using a cutting machine or other cutting device).

[0161] After the connecting part of the folded side and the bottom side near the front end of the bottom side is cut open, the head of the pre-folded paper pad is divided into an upper paper pad and a lower paper pad, that is, the head of the pre-folded paper pad is divided into "two layers".

[0162] As long as the width of the head of the bottom surface is less than the width of the non-head of the bottom surface, and the overall width of the heads of the two folded surfaces is less than the overall width of the non-head of the two folded surfaces, after the head of the pre-folded paper pad is processed, the frontmost shape of the head of the bottom surface can be pointed or flat, and the frontmost shape of the head of the folded surface can be pointed or flat.

[0163] S102: Feed the head of the pre-folded paper pad into the flow channel of the paper pad forming machine. The bottom surface of the pre-folded paper pad is located in the area between the inner flow channel and the outer flow channel of the paper pad forming machine, and the folded surface of the pre-folded paper pad is located in the area between the inner flow channel and the outer flow channel of the paper pad forming machine.

[0164] When the width of the outlet of the flow channel of the paper pad forming machine is A, the width of the head of the bottom surface of the pre-folded paper pad can be greater than or equal to zero and less than or equal to 1.2A. The overall width of the heads of the two folded surfaces can be greater than or equal to zero and less than or equal to 1.2A. That is, the width of the front end of the bottom surface and the overall width of the front end of the two folded surfaces being slightly greater than the width of the outlet of the flow channel can also ensure smooth paper feeding.

[0165] When the closing angle of one side wall of the flow channel of the paper pad forming machine is B1 and the closing angle of the other side wall is B2, the following can be selected: 0 degrees ≤ (the sum of the angles of inclination of the two sides of the head of the pre-folded paper pad towards the middle of the bottom surface) ≤ (B1 + B2 + 30 degrees), 0 degrees ≤ (the sum of the angles of inclination of the sides of the heads of the two folded surfaces away from the middle of the bottom surface towards the middle of the bottom surface) ≤ (B1 + B2 + 30 degrees). That is, when the closing range of the head of the pre-folded paper pad is slightly greater than the closing range of the two side walls of the flow channel, the smooth feeding of paper can still be ensured.

[0166] Because the connecting part near the front end of the bottom surface of the folded surface is cut open, the head of the pre-folded paper pad is divided into an upper paper pad and a lower paper pad. That is, the head of the pre-folded paper pad is divided into "two layers". The lower paper pad of the pre-folded paper pad is located below the inner flow channel and between the outer flow channel of the paper pad forming machine, and the upper paper pad of the pre-folded paper pad is located above the inner flow channel and between the outer flow channel of the paper pad forming machine.

[0167] S103: The forming gear in the paper pad forming machine bites the folding surface and bottom surface of the pre-folded paper pad;

[0168] The forming gear at the outlet of the paper pad forming machine can simultaneously clamp the paper on the "upper and lower layers" of the pre-folded paper pad feed head, that is, it can simultaneously clamp the folded surface and the bottom surface of the pre-folded paper pad.

[0169] S104: The forming gear in the paper pad forming machine pulls the pre-folded paper pad downstream.

[0170] The paper feeding method of this invention, because the head of the pre-folded paper pad is processed before paper feeding, simultaneously reduces the width of the head of the bottom surface of the pre-folded paper pad and the overall width of the heads of the two folded surfaces, that is, simultaneously reduces the width of the "upper and lower layers" of the pre-folded paper pad feed head. During paper feeding, i.e., when the head of the pre-folded paper pad is fed into the flow channel of the paper pad forming machine, the friction between the head of the pre-folded paper pad and the inner wall of the flow channel of the paper pad forming machine is small, reducing the deformation reaction force of the paper material, improving the smoothness of paper feeding, and allowing the forming gear at the flow channel outlet of the paper pad forming machine to almost simultaneously clamp the "upper and lower layers" of the pre-folded paper pad feed head. The paper can be clamped onto the folded and bottom surfaces of the pre-folded paper pad almost simultaneously, while pulling the "upper and lower layers" of the paper feed head of the pre-folded paper pad to achieve feeding and downstream conveying. This allows the upper (the area between the upper and lower inner channels and the outer channel) and lower (the area between the lower inner channel and the outer channel) of the paper pad forming machine to feed paper synchronously. In other words, the upper paper pad between the upper and lower inner channels and the lower paper pad between the lower and outer channels of the paper pad forming machine are simultaneously conveyed downstream, ensuring smooth paper feeding and thus guaranteeing the successful formation of the pillow-shaped three-dimensional pad material in the paper pad forming machine.

[0171] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A pre-folded paper pad, characterized in that, It includes a bottom surface and two folded surfaces, which are connected to the two sides of the bottom surface respectively, and the two folded surfaces are folded onto the bottom surface. The width of the head of the bottom surface is smaller than the width of the non-head portion of the bottom surface, and the overall width of the heads of the two folded surfaces is smaller than the overall width of the non-head portions of the two folded surfaces. The folded surface and the bottom surface are separated at the section near the foremost point of the bottom surface. This allows the two sides of the bottom surface near the foremost point to fold towards the middle of the bottom surface to reduce the width of the bottom head, and also allows the two sides of the bottom surface to slope towards the middle of the bottom surface to reduce the width of the bottom head. This also allows the folded surface near the foremost point of the bottom surface to fold towards the middle of the bottom surface to reduce the overall width of the folded surface head, and allows the sides of the folded surface furthest from the middle of the bottom surface to slope towards the middle of the bottom surface to reduce the overall width of the folded surface head. The forming gear in the paper pad forming machine can simultaneously clamp the head of the bottom surface and the heads of the two folded surfaces.

2. The pre-folded paper pad according to claim 1, characterized in that, The head of the bottom surface is folded and / or the head of the folded surface is folded.

3. The pre-folded paper pad according to claim 1, characterized in that, The two sides of the head of the bottom surface slope towards the middle of the bottom surface at angles α1 and α2, respectively, where 0 degrees < α1 < 90 degrees and 0 degrees < α2 < 90 degrees. The head of the folded surface has a side that is away from the middle of the bottom surface that is inclined toward the middle of the bottom surface with inclination angles of β1 and β2, respectively, where 0 degrees < β1 < 90 degrees and 0 degrees < β2 < 90 degrees.

4. The pre-folded paper pad according to claim 3, characterized in that, 20 degrees ≤ α1 ≤ 70 degrees, 20 degrees ≤ α2 ≤ 70 degrees, 20 degrees ≤ β1 ≤ 70 degrees, 20 degrees ≤ β2 ≤ 70 degrees, or, 40 degrees ≤ (α1 or α2 + β1 or β2) ≤ 140 degrees.

5. The pre-folded paper pad according to claim 1, characterized in that, When the width of the outlet of the flow channel of the paper pad forming machine applicable to pre-folded paper pads is A, the width of the frontmost point of the bottom surface is greater than or equal to zero and less than or equal to 1.2A, and the overall width of the frontmost points of the two folded surfaces is greater than or equal to zero and less than or equal to 1.2A.

6. The pre-folded paper pad according to claim 3, characterized in that, When the closing angle of one side wall of the flow channel of the paper pad forming machine for the pre-folded paper pad is B1 and the closing angle of the other side wall is B2, 0 degrees ≤ (α1+α2) ≤ (B1+B2+30 degrees) and 0 degrees ≤ (β1+β2) ≤ (B1+B2+30 degrees).

7. The pre-folded paper pad according to claim 2, characterized in that, The head of the folded surface and a section of the connection between the head and the non-head of the folded surface are separated, and the separation area starts from the side of the folded surface away from the middle of the bottom surface.

8. The pre-folded paper pad according to claim 2, characterized in that, The area between the two folded surfaces is flat.

9. The pre-folded paper pad according to claim 1, characterized in that, The shape and size of the head of the bottom surface are the same as the overall shape and size of the heads of the two folded surfaces.

10. A method for feeding paper onto a pre-folded paper pad, characterized in that, Includes the following steps: a. Process the head of the pre-folded paper pad so that the width of the head of the bottom surface of the pre-folded paper pad is less than the width of the non-head of the bottom surface, and the overall width of the head of the two folded surfaces of the pre-folded paper pad is less than the overall width of the non-head of the two folded surfaces. The connection part between the folded surface and the bottom surface near the front end of the bottom surface is separated. b. Feed the head of the pre-folded paper pad into the flow channel of the paper pad forming machine. The bottom surface of the pre-folded paper pad is located in the area between the inner flow channel and the outer flow channel of the paper pad forming machine, and the folded surface of the pre-folded paper pad is located in the area between the inner flow channel and the outer flow channel of the paper pad forming machine. c. The forming gear in the paper pad forming machine can simultaneously bite the head of the two folded surfaces and the head of the bottom surface of the pre-folded paper pad; d. The forming gear in the paper pad forming machine pulls the pre-folded paper pad downstream.

11. The paper feeding method according to claim 10, characterized in that, In step a, the head of the pre-folded paper pad is processed as follows: First, the connecting part between the folded surface and the bottom surface near the front end of the bottom surface is cut off. Then, the two sides of the head of the bottom surface are folded towards the middle of the bottom surface so that the two sides of the head of the bottom surface are inclined towards the middle of the bottom surface with inclination angles of α1 and α2 respectively. The side of the head of the folded surface away from the middle of the bottom surface is folded towards the middle of the bottom surface so that the side of the head of the folded surface away from the middle of the bottom surface is inclined towards the middle of the bottom surface with inclination angles of β1 and β2 respectively.

12. The paper feeding method according to claim 11, characterized in that, 0 degrees < α1 < 90 degrees, 0 degrees < α2 < 90 degrees, 0 degrees < β1 < 90 degrees, 0 degrees < β2 < 90 degrees, or 20 degrees ≤ α1 ≤ 70 degrees, 20 degrees ≤ α2 ≤ 70 degrees, 20 degrees ≤ β1 ≤ 70 degrees, 20 degrees ≤ β2 ≤ 70 degrees, or 40 degrees ≤ (α1 or α2 + β1 or β2) ≤ 140 degrees.

13. The paper feeding method according to claim 10, characterized in that, In step b, when the width of the outlet of the flow channel is A, the width of the frontmost part of the bottom surface is greater than or equal to zero and less than or equal to 1.2A, and the overall width of the frontmost parts of the two folded surfaces is greater than or equal to zero and less than or equal to 1.2A.

14. The paper feeding method according to claim 11, characterized in that, In step b, when the angle of convergence of one sidewall of the flow channel is B1 and the angle of convergence of the other sidewall is B2, 0 degrees ≤ (α1+α2) ≤ (B1+B2+30 degrees) and 0 degrees ≤ (β1+β2) ≤ (B1+B2+30 degrees).

15. The paper feeding method according to claim 11, characterized in that, After the connecting section near the front of the bottom surface is cut open, the head of the pre-folded paper pad is divided into an upper paper pad and a lower paper pad. In step b, the lower layer of the pre-folded paper pad is located between the inner flow channel and the outer flow channel of the paper pad forming machine, and the upper layer of the pre-folded paper pad is located between the inner flow channel and the outer flow channel of the paper pad forming machine.

16. The paper feeding method according to claim 10, characterized in that, In step a, the head of the pre-folded paper pad is processed as follows: First, the connecting part between the folded surface and the bottom surface near the front end of the bottom surface is cut off. Then, the two connecting parts between the head and the non-head of the bottom surface are cut off, with the cutting area starting from both sides of the bottom surface towards the middle. Next, the connecting part between the head and the non-head of the folded surface is cut off, with the cutting area starting from the side of the folded surface away from the middle of the bottom surface. Then, the two sides of the head of the bottom surface are folded towards the middle of the bottom surface, and the side of the head of the folded surface away from the middle of the bottom surface is folded towards the middle of the bottom surface.

17. The paper feeding method according to claim 10, characterized in that, In step a, after the head of the pre-folded paper pad is processed, The foremost tip of the bottom surface of the pre-folded paper pad is pointed or flat-headed, and / or The foremost tip of the folded surface of the pre-folded paper pad is pointed or flat.

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