A printing pressure compensating pad suitable for multiple types of paperboard

Abstract

The application discloses a printing pressure compensation pad suitable for multiple types of paperboards and relates to the printing field.The printing pressure compensation pad comprises a pad body, the pad body comprises an elastic compensation layer, a bonding layer and a supporting bottom film layer, the elastic compensation layer is made of ethylene-vinyl acetate copolymer as a base material and is compounded with regenerated foam cotton, polyurethane and rubber and is formed by foaming, the printing pressure compensation pad is provided with the elastic compensation layer, the bonding layer and the supporting bottom film layer, the structural stability and the pressure distribution uniformity of the pad body can be greatly enhanced, the simple structure and the uneven pressure conduction of the traditional pad can be improved, the elastic compensation layer is made of ethylene-vinyl acetate copolymer as a base material, is compounded with regenerated foam cotton, polyurethane and rubber and is integrally formed by foaming, is matched with the Shore A hardness of 30-40, has excellent and durable resilience, can be quickly recovered under long-term pressure and can effectively compensate the printing cylinder jumping and the paperboard thickness difference.

Description

Technical Field

[0001] This invention relates to printing technology, and more specifically to a printing pressure compensation pad that is compatible with various types of cardboard. Background Technology

[0002] In corrugated cardboard printing, printing pressure compensation pads, as auxiliary components for overprinting, mainly cover the outer wall of the printing cylinder. They are used to buffer rigid pressure, compensate for cylinder runout, and stabilize the contact pressure of the printing plate, directly determining the dot reproduction accuracy and the integrity of the cardboard printing. Especially in printing scenarios with thin corrugated cardboard, low basis weight cardboard, and old equipment, insufficient elastic recovery and pressure uniformity of the pads can directly cause dot gain, pattern shift, white gaps, or cardboard crushing, significantly reducing the finished product qualification rate and printing efficiency.

[0003] Existing flexible printing pads are mostly made of single EVA foam or ordinary foam material. The overall structure is an uncontrollable homogeneous elastic structure. After long-term pressure, the rebound is significantly reduced and the deformation cannot be repaired on its own. It is difficult to continuously and stably compensate for roller runout and paperboard thickness errors, resulting in uneven fluctuations in printing pressure throughout the printing process. It cannot adapt to the stable printing needs of various types of paperboard and cannot meet the production requirements of high-precision and high-speed corrugated printing.

[0004] To address this issue, the applicant proposes a printing pressure compensation pad that is compatible with various types of cardboard. Summary of the Invention

[0005] The purpose of this invention is to provide a printing pressure compensation pad that is compatible with various types of cardboard, in order to solve the problems that most conventional flexible printing pads in the prior art are made of simple EVA foam or ordinary foam material, with a single overall structure and fixed elastic properties. Under continuous printing pressure, they are prone to problems such as decreased elasticity and slow rebound, which cannot stably compensate for the difference in printing roller runout and cardboard thickness, making it difficult to adapt to printing on various types of cardboard and failing to meet the requirements of high-precision and high-speed printing.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a printing pressure compensation pad adapted to multiple types of cardboard, comprising a pad body, wherein the pad body includes an elastic compensation layer, an adhesive layer and a supporting bottom film layer;

[0007] The elastic compensation layer is made of ethylene-vinyl acetate copolymer as the base material and is compounded with recycled foam, polyurethane and rubber, and is formed by foaming.

[0008] The adhesive layer is an environmentally friendly adhesive layer, located between the elastic compensation layer and the supporting base film layer.

[0009] Furthermore, the supporting substrate layer is a PET film layer.

[0010] Furthermore, the elastic compensation layer is located on the topmost layer of the pad body.

[0011] Furthermore, the supporting bottom membrane layer is located at the bottommost layer of the liner body.

[0012] Furthermore, the elastic compensation layer is a single layer integrally foamed.

[0013] Furthermore, the Shore A hardness of the elastic compensation layer is 30-40.

[0014] Furthermore, the elastic compensation layer, adhesive layer, and supporting base film layer are stacked sequentially.

[0015] Furthermore, the adhesive layer is a continuous and uniform adhesive layer.

[0016] Furthermore, the thickness of the elastic compensation layer is greater than the thickness of the adhesive layer.

[0017] Furthermore, the thickness of the supporting base film layer is less than the thickness of the elastic compensation layer.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] By incorporating an elastic compensation layer, an adhesive layer, and a supporting bottom film layer, the structural stability and pressure distribution uniformity of the pad body are significantly enhanced, improving upon the simple structure and uneven pressure transmission of traditional pads. The elastic compensation layer uses ethylene-vinyl acetate copolymer as the base material, composite recycled foam, polyurethane, and rubber, and is integrally foamed and molded. With a Shore A hardness of 30-40, it possesses excellent and durable resilience, quickly recovering even under prolonged pressure. This effectively compensates for printing roller runout and differences in cardboard thickness. The elastic compensation layer is located on the top layer of the pad body, and the supporting bottom film layer is located on the bottom layer. The lower layer, with a thickness ratio of the elastic compensation layer being greater than that of the adhesive layer and the support bottom film layer being less than that of the elastic compensation layer, ensures smoother pressure transmission and more reliable cushioning. The adhesive layer is a continuous and uniform environmentally friendly glue layer, which ensures tight bonding and uniform stress between the layers, making it less prone to delamination or blistering. The support bottom film layer uses a PET film layer, which provides a flat and reliable support for the pad body, allowing it to fit tightly against the outer wall of the printing cylinder and preventing displacement. It can stably adapt to various types of paperboard printing, especially improving the crushing problem of thin paperboard and meeting the needs of high-precision and high-speed corrugated paperboard printing. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the elastic compensation layer structure provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the adhesive layer structure provided in an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Pad body; 101. Elastic compensation layer; 102. Adhesive layer; 103. Supporting bottom film layer. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] As attached Figure 1 To be continued Figure 3 As shown:

[0028] Example 1:

[0029] The present invention provides a printing pressure compensation pad that is compatible with various types of cardboard, including a pad body 1, the pad body 1 comprising an elastic compensation layer 101, an adhesive layer 102 and a support bottom film layer 103.

[0030] The elastic compensation layer 101 is made of ethylene-vinyl acetate copolymer as the base material and is compounded with recycled foam, polyurethane and rubber, and is formed by foaming.

[0031] The adhesive layer 102 is an environmentally friendly adhesive layer, which is located between the elastic compensation layer 101 and the supporting base film layer 103.

[0032] Furthermore, the supporting bottom film layer 103 is a PET film layer.

[0033] Furthermore, the elastic compensation layer 101 is located on the topmost layer of the pad body 1.

[0034] Furthermore, the supporting bottom membrane layer 103 is located at the bottom of the pad body 1.

[0035] Working principle: When using the printing pressure compensation pad, the support bottom film layer 103 of the pad body 1 is tightly wrapped and fixed to the outer wall of the printing cylinder, so that the elastic compensation layer 101 faces the side of the cardboard to be printed. The surface of the elastic compensation layer 101 is stably attached to the printing plate. The adhesive layer 102 evenly connects the elastic compensation layer 101 and the support bottom film layer 103, forming a continuous and complete three-layer composite support structure. During the printing process, the elastic compensation layer 101 uses ethylene-vinyl acetate copolymer as the base material, combined with composite recycled foam (e.g., recycled ethylene-vinyl acetate copolymer foam that meets GRS global recycling standards), polyurethane and rubber, to provide stable elastic support in an integrated foaming structure. It continuously bears the printing pressure and adaptively compensates for the roller runout and the difference in cardboard thickness. The support bottom film layer 103 maintains the overall flatness and adhesion stability, and the adhesive layer 102 maintains the interlayer connection firmly without delamination, so that the printing pressure remains uniform and stable throughout the process, without local pressure being too high or too low.

[0036] This solution employs a three-layer composite structure consisting of an elastic compensation layer 101, an adhesive layer 102, and a supporting bottom film layer 103, stacked sequentially. This integrated layered design enhances the structural stability and pressure uniformity of the pad body 1, solving the problems of conventional pad structures being simple and having uneven stress distribution. Addressing the shortcomings of existing flexible printed pads, such as significant loss of resilience and inability to self-repair deformation after prolonged pressure, the elastic compensation layer 101 is made from an ethylene-vinyl acetate copolymer substrate, combined with recycled foam, polyurethane, and rubber through foaming molding. With a Shore A hardness of 30-40, the elastic compensation layer 101 possesses durable and stable resilience, quickly returning to its original shape after pressure to prevent permanent deformation and continuously and stably compensate for roller runout and cardboard thickness errors. The elastic compensation layer 101 is positioned as the uppermost layer of the pad body 1, supporting the bottom film layer 103. Set as the bottom layer, and with the dimensional relationship that the thickness of the elastic compensation layer 101 is greater than that of the adhesive layer 102 and the thickness of the support bottom film layer 103 is less than that of the elastic compensation layer 101, the pressure transmission path is further optimized to ensure pressure buffering and compensation effects. The adhesive layer 102 uses a continuous and uniform environmentally friendly adhesive layer to ensure that the elastic compensation layer 101 and the support bottom film layer 103 are firmly bonded and have consistent stress, without delamination, hollowing, or other problems that affect pressure uniformity. The support bottom film layer 103 uses a PET film layer to provide a flat and stable base for the overall structure, ensuring that the pad body 1 is tightly attached to the outer wall of the printing cylinder without slippage or warping. This allows the pad body 1 to stably adapt to printing on various types of paperboard, effectively avoiding dot gain, pattern shift, white gaps, and paperboard crushing problems, and meeting the production requirements of high-precision, high-speed corrugated paperboard printing.

[0037] Example 2:

[0038] This embodiment is basically the same as the previous embodiment, except that the elastic compensation layer 101 is a single layer integrally foamed.

[0039] Furthermore, the Shore A hardness of the elastic compensation layer 101 is 30 to 40.

[0040] Furthermore, the elastic compensation layer 101, the adhesive layer 102, and the supporting base film layer 103 are stacked in sequence.

[0041] Furthermore, the adhesive layer 102 is a continuous and uniform adhesive layer.

[0042] Furthermore, the thickness of the elastic compensation layer 101 is greater than the thickness of the adhesive layer 102.

[0043] Furthermore, the thickness of the supporting base film layer 103 is less than the thickness of the elastic compensation layer 101.

[0044] Working Principle: By setting the bottom film layer 103 to be a PET film layer, the pad body 1 remains flat and firm when it is bonded to the outer wall of the printing cylinder, preventing wrinkles and deformation. This improves the overall structural stability and ensures uniform pressure transmission. The elastic compensation layer 101, located at the top of the pad body 1, directly contacts the printing plate to bear pressure, prioritizing the buffering of printing pressure and efficiently compensating for cylinder runout and cardboard thickness errors. The bottom film layer 103, located at the bottom of the pad body 1, forms a stable bonding base, preventing interlayer misalignment and ensuring stable transmission of printing pressure. The elastic compensation layer 101, being a single-layer foamed structure, has a uniform and continuous internal structure, resulting in seamless stress distribution and faster, more durable rebound. The Shore A hardness of the elastic compensation layer 101, between 30 and 40, ensures that the elastic compensation layer 101 also... Considering both cushioning performance and support strength, this design achieves compatibility with various types of cardboard printing, is less prone to crushing, and produces clear dot reproduction. The sequentially stacked arrangement of the elastic compensation layer 101, adhesive layer 102, and support base film layer 103 creates an orderly pressure transmission path, resulting in uniform overall stress and stable cushioning compensation. The continuous and uniform adhesive layer 102 ensures a seamless bond between the elastic compensation layer 101 and the support base film layer 103, preventing delamination over long-term use and enhancing structural strength. The greater thickness of the elastic compensation layer 101 compared to the adhesive layer 102 ensures sufficient cushioning and deformation space, improving pressure compensation capability and enhancing rebound stability. The smaller thickness of the support base film layer 103 compared to the elastic compensation layer 101 reduces rigidity while maintaining support strength, achieving a balance between bonding stability and elastic cushioning.

[0045] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A printing pressure compensation pad adaptable to various types of cardboard, comprising a pad body (1), characterized in that, The pad body (1) includes an elastic compensation layer (101), an adhesive layer (102), and a supporting bottom film layer (103). The elastic compensation layer (101) is made of ethylene-vinyl acetate copolymer as the base material and composited with recycled foam, polyurethane and rubber, and is formed by foaming. The adhesive layer (102) is an environmentally friendly adhesive layer, located between the elastic compensation layer (101) and the supporting base film layer (103).

2. The printing pressure compensation pad adapted to multiple types of cardboard according to claim 1, characterized in that, The supporting bottom film layer (103) is a PET film layer.

3. The printing pressure compensation pad adapted to multiple types of cardboard according to claim 1, characterized in that, The elastic compensation layer (101) is located on the top layer of the pad body (1).

4. The printing pressure compensation pad adapted to multiple types of cardboard according to claim 1, characterized in that, The supporting bottom membrane layer (103) is located at the bottom of the pad body (1).

5. A printing pressure compensation pad adapted to multiple types of cardboard according to claim 1, characterized in that, The elastic compensation layer (101) is a single layer integrally foamed.

6. A printing pressure compensation pad adapted to multiple types of cardboard according to claim 1, characterized in that, The Shore A hardness of the elastic compensation layer (101) is 30-40.

7. A printing pressure compensation pad adapted to multiple types of cardboard according to claim 1, characterized in that, The elastic compensation layer (101), adhesive layer (102), and supporting base film layer (103) are stacked in sequence.

8. A printing pressure compensation pad adapted to multiple types of cardboard according to claim 1, characterized in that, The adhesive layer (102) is a continuous and uniform adhesive layer.

9. A printing pressure compensation pad adapted to multiple types of cardboard according to claim 1, characterized in that, The thickness of the elastic compensation layer (101) is greater than the thickness of the adhesive layer (102).

10. A printing pressure compensation pad adapted to multiple types of cardboard according to claim 1, characterized in that, The thickness of the supporting base film layer (103) is less than the thickness of the elastic compensation layer (101).

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