Printing ink fountain for printing

Abstract

The utility model relates to the field of plastic packaging film roll printing equipment, in particular to an ink fountain for printing, which comprises a rectangular ink fountain, two ends of the ink fountain are provided with short-edge groove walls, two sides of the ink fountain are provided with long-edge groove walls, the short-edge groove walls are provided with ink inlets, the long-edge groove walls are provided with ink outlets, the ink outlets are provided with baffle plates parallel to the long-edge groove walls, and the baffle plates are provided with baffle plates parallel to the long-edge groove walls. The top edge of the baffle is an arc-shaped edge with the high middle and the two low ends, the end, close to the ink inlet, of the baffle is bent towards the ink inlet to form a first flow guide part, and the end, away from the ink inlet, of the baffle is bent towards the opposite side to form a second flow guide part. And the distance between the first flow guide part and the short-edge groove wall on the same side is smaller than that between the second flow guide part and the short-edge groove wall on the same side.

Description

Technical Field

[0001] The utility model relates to the field of roller printing equipment for plastic packaging films, in particular to an ink tank of a printing press. Background Art

[0002] The continuous ink feeding technology of a printing press is a technology that realizes the continuous supply of ink during the printing process. This technology ensures that the ink can be continuously and stably supplied to the printing plate during the operation of the printing press, thereby realizing efficient and continuous printing operations. Patent 202121088550.5 discloses a plastic packaging film printing ink circulation supply device, wherein a baffle is provided in the ink tank, and the baffle separates the ink tank into an ink supply tank and an overflow tank. By setting the baffle, the excess ink in the ink supply tank will overflow the baffle into the overflow tank, so that the amount of ink in the ink supply tank is always at an appropriate level to realize continuous printing.

[0003] The disadvantages of the above-mentioned prior art are: (1) the conventional ink tank is generally a rectangular long tank. Since the rectangular tank has a wide bottom surface, a large volume and a large ink capacity, a large amount of ink must be injected into the ink tank to reach the printing height of the printing roller before printing can be carried out, which consumes too much ink to spread the bottom, and the ink is easy to dry at the bottom of the tank; (2) the baffle is a rectangular baffle with a fixed height. The ink in the supply tank must be higher than the baffle before it can flow from the supply tank to the overflow tank, which results in the overflow path of the ink being unidirectional (i.e., from the ink inlet → ink supply tank → overflow tank). In fact, the ink has an initial speed when it enters the ink supply slot from the ink inlet, pushing the ink in the ink supply slot to the slot wall opposite to the ink inlet (the ripple phenomenon can be seen with the naked eye), which leads to a higher ink concentration near the slot wall (specifically, some large molecular weight colorant molecules will aggregate), and the ink is easy to deposit on the slot wall. At this time, if the same overflow height is used, the overflow amount in the area with higher concentration and the area with lower concentration will be consistent, making the ink concentration in different areas of the ink supply slot uneven for a long time, which ultimately affects the uniformity of ink adhesion on the printing roller. Utility Model Content

[0004] The utility model aims to provide a method for solving the problem of retraction and length adjustment of a supporting mechanism.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a printing ink groove, comprising a rectangular ink groove, wherein the two ends of the ink groove are short side groove walls and the two sides are long side groove walls, the short side groove walls are provided with an ink inlet, the long side groove walls are provided with an ink outlet, a baffle plate parallel to the long side groove wall is provided at the ink outlet, the top edge of the baffle plate is an arc-shaped edge which is high in the middle and low at both ends, one end of the baffle plate close to the ink inlet is bent toward the side away from the ink outlet to form a first guide portion, and the other end of the baffle plate is bent toward the side where the ink outlet is located to form a second guide portion; the distance between the first guide portion and the short side groove wall on the same side is less than the distance between the second guide portion and the short side groove wall on the same side.

[0006] The inventor of the present application has made a thorough study and found that at the ink inlet at one end of the ink tank, the ink flow around it is large and the concentration is low due to the initial speed of the ink entering, while the ink tank area opposite to the ink inlet is easy to accumulate here due to the reduction of the initial speed of the ink. The height of the existing baffle is consistent before and after, which leads to the same amount of ink overflow in the high-concentration area and the low-concentration area per unit time, so that the ink concentration in different areas is uneven for a long time. Therefore, the inventor has devoted himself to designing a new type of ink tank, using the characteristics of different concentrations in different areas of the ink tank, and proposed this technical solution, which has the following advantages:

[0007] 1. On the one hand, the baffle in the middle of the ink slot is designed to be high in the middle and low at both ends, so that the overflow start time of different areas is adjusted, so that the ink in the middle area starts to overflow later than the ink on both sides. In this way, since both ends are overflowing, the ink flow in the middle area is slower than that at the two ends, maintaining a relatively stable ink surface; when both ends and the middle area are overflowing, the overflow amount in the middle area per unit time is lower than the overflow amount at the two ends, thus ensuring less lateral overflow in the middle area. Compared with the two end areas, the flow rate in the middle area is slower, and a relatively stable ink surface can continue to be maintained to ensure printing quality;

[0008] 2. The two ends of the baffle are provided with curved parts according to the flow characteristics of the ink liquid in the corresponding area. In this way, due to the large initial velocity at the ink inlet, part of the ink is guided away by the first guide part, reducing the velocity impact on the middle area; and the ink is easily accumulated in the groove wall area opposite to the ink inlet, so the second guide part is designed to guide the accumulated ink away; such a design forms a circular fluid movement with uniform speed in the ink groove and around the baffle, so that the ink in the entire ink groove flows slowly and steadily, improving the stability of the overall ink surface;

[0009] 3. The distance between the first guide part and the short side groove wall on the same side is less than the distance between the second guide part and the short side groove wall on the same side. Since ink is a high-viscosity liquid, it is easier to form laminar flow rather than turbulent flow. The opening formed between the first guide part and the groove wall is relatively small. Affected by the narrow tube effect, the ink entering from the ink inlet will pass through the opening at a higher speed, reducing the speed pressure at the ink inlet; the opening formed between the second guide part and the groove wall is relatively large, but because the ink concentration there is relatively high (the viscosity is also relatively large), a larger opening is used to increase the flow rate per unit time.

[0010] In summary, the solution of the utility model can achieve uniform flow of ink in the ink slot, improve the smoothness of the ink surface in the middle area of ​​the ink slot, and improve the stability of printing.

[0011] Preferably, a notch is provided in the middle of the top edge of the baffle, and a plug plate is provided on the notch. When the ink tank needs to be quickly drained, the plug plate can be pulled out to increase the flow rate of the ink.

[0012] Preferably, a plurality of slots parallel to the long side slot walls are provided in the bottom of the ink slot, so that the position of the baffle in the ink slot can be adjusted.

[0013] Preferably, the baffle is a stainless steel baffle to prevent reaction with ink. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A top view of an embodiment of an ink tank for printing according to the utility model;

[0015] Figure 2 It is a three-dimensional structural diagram of an embodiment of an ink tank for printing according to the utility model. DETAILED DESCRIPTION

[0016] The following is further described in detail through specific implementation methods:

[0017] The figure marks in the drawings of the specification include: ink groove 1, long side groove wall 1-1, short side groove wall 1-2, ink inlet 1-3, ink outlet 1-4, ink cavity 1-5, reflux cavity 1-6 baffle 2, top edge 2-1, first guide part 2-2, second guide part 2-3.

[0018] The embodiment is basically as shown in the attached Figure 1 , Figure 2 As shown: an ink tank for printing, including a rectangular ink tank 1, the two ends of the ink tank 1 are short side tank walls 1-2, and the two sides are long side tank walls 1-1, the short side tank walls 1-2 are provided with an ink inlet 1-3, and the long side tank wall 1-1 is provided with an ink outlet 1-4, and the cross-section of the ink tank 1 along the short side is trapezoidal.

[0019] The bottom of the ink tank 1 is provided with a plurality of slots parallel to the long side slot wall 1-1. After the baffle 2 is vertically inserted into the slots, the oil tank 1 is divided into an ink chamber 1-5 and a reflux chamber 1-6.

[0020] The top edge 2 of the baffle 2 is in an arc shape with a high middle and low ends, and the baffle 2 is bilaterally symmetrical along its center line. The highest position of the middle portion of the baffle 2 is 5 cm lower than the upper edge of the ink tank 2, and the highest positions of the two ends of the baffle 2 are 10 cm lower than the upper edge of the ink tank 2, that is, the height difference between the highest position and the lowest position of the top edge of the baffle 2 is 5 cm. A notch is provided in the middle of the baffle 2, and a plug is connected to the notch with a pin.

[0021] The right end of the baffle 2 is bent away from the long side groove wall 1-1 where the outlet ink 1-4 is located to form a first guide portion 2-2. The plate wall of the first guide portion 2-2 is opposite to the ink inlet 1-3, so that after the ink enters the ink groove from the ink inlet 1-3, it is divided into two by the plate wall of the guide portion 2-2, one part flows along the ink groove cavity 1-5, and the other part flows into the reflux cavity 1-6.

[0022] The left end of the baffle 2 is bent toward the long side groove wall 1-1 where the ink outlet 1-4 is located to form a first guide portion 2-3. The distance between the first guide portion 2-2 and the short side groove wall 1-2 on the same side is 10 cm, and the distance between the second guide portion 2-3 and the short side groove wall 1-2 on the same side is 20 cm. The baffle 2 is a stainless steel baffle.

[0023] In this embodiment, after the ink tank 1 is put into use, the ink enters the ink tank 1 from the ink inlet 1-3 and is diverted by the first guide part 2-2. A part of the ink enters the reflux chamber 1-6 from the second guide part along the ink chamber 1-5 and mixes with the ink in the reflux chamber 1-6; the other part directly enters the reflux chamber 1-6. When the ink liquid level in the ink chamber 1-5 is higher than the lowest position of the baffle 2, the ink overflows to the ink chamber 1-5 along the two ends of the baffle 2. When the ink liquid level in the ink chamber 1-5 is higher than the highest position of the baffle 2, the ink overflows to the reflux chamber 1-6 over the highest point of the baffle 2. The ink collected in the reflux chamber 1-6 is discharged from the ink outlet 1-4, realizing the continuous flow of ink in the ink tank 1 and the stable liquid level, thereby ensuring the printing quality.

[0024] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A printing ink tank, comprising a rectangular ink tank, wherein the two ends of the ink tank are short side tank walls, and the two sides are long side tank walls, the short side tank walls are provided with ink inlets, the long side tank walls are provided with ink outlets, and the ink outlets are provided with baffles parallel to the long side tank walls, characterized in that: The top edge of the baffle is an arc-shaped edge that is high in the middle and low at both ends. The end of the baffle close to the ink inlet is bent toward the side away from the ink outlet to form a first guide portion, and the other end of the baffle is bent toward the side where the ink outlet is located to form a second guide portion; the distance between the first guide portion and the short side groove wall on the same side is less than the distance between the second guide portion and the short side groove wall on the same side.

2. The printing ink tank according to claim 1, characterized in that: A notch is provided in the middle of the top edge of the baffle, and a plug plate is provided on the notch.

3. A printing ink tank according to claim 2, characterized in that: A plurality of slots parallel to the long side slot walls are arranged in the bottom of the ink slot.

4. The printing ink tank according to claim 3, characterized in that: The baffle is a stainless steel baffle.

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