JP6405548B2 - Spatula for ink - Google Patents

Description

  The present invention relates to an ink spatula used for screen printing.

  In screen printing, a spatula is used to stir, feed or remove viscous fluid (ink) such as conductive paste or paint from the printing plate (for example, Patent Document 1).

  In Patent Document 1, in order to supply and remove conductive paste and the like without damaging the printing plate in surface mounting of electronic components by screen printing and bump formation on a semiconductor chip, a spatula part of a soft spatula is provided. It is made of an ink-resistant plastic material such as polyethylene.

  Here, when the amount of ink supplied to the printing plate is too small, the print quality may be deteriorated due to insufficient ink. On the other hand, when the amount of ink is too large, the excessively supplied ink is dried during printing, and the print quality is deteriorated or ink loss is caused by drying. In addition, it is necessary to remove excess ink from the printing plate after printing, which reduces process efficiency. In addition, it is unavoidable that ink cannot be completely removed from the printing plate, resulting in loss. To do. Furthermore, there is a concern about environmental damage caused by discarding a solvent that volatilizes a large amount of ink exposed to the outside or paper or cloth from which ink has been wiped off. In particular, the conductive ink targeted by Patent Document 1, for example, an expensive ink such as a silver paste or a solder paste, must have as little loss as possible, and contains a harmful substance such as a leaded solder paste. If so, the environmental impact of disposal becomes a problem.

  In consideration of such circumstances, the amount of ink supplied to the printing plate varies depending on the purpose of printing, the printing plate, and the type of ink. The ink scooped up by the instrument is preferably supplied to the printing plate as little as possible on the instrument. Further, after printing, it is more desirable to remove the ink as much as possible on the printing plate and the instrument.

  Further, for the same reason, it is desirable to scoop up the ink in the ink container without leaving it on the bottom or side wall of the ink container.

  However, in the work using the soft spatula described in Document 1, since the spatula portion is flat, there is a merit that it is easy to scoop and remove ink, but the amount of ink collected from the ink container is in the sense of the operator. Because it must be relied upon, it is difficult to always collect a certain range of quantities. On the other hand, in a device having a dent such as a spoon or ice cream dish, it is easy to measure a certain amount of ink. There was a problem.

  Further, the ink remaining in the bottom of the ink container has a spatula whose tip is rounded as in Reference 1 when the bottom of the container is raised in a convex shape toward the center. When contacting the bottom, it was in contact with only one point of the bottom of the container, so that it was not possible to scoop ink effectively.

JP2000-225687

  In view of the above circumstances, the present invention provides a spatula for ink that can repeatedly collect a stable amount of ink from an ink container and supply it to a printing plate, and can effectively remove ink from the inside of the ink container or from the printing plate. For the purpose.

In order to achieve the above object, the invention according to claim 1 is a spatula for ink used for screen printing, and has a rod-like handle portion having a length of 100 mm to 150 mm, and the handle portion. An elongated thin plate-like spatula part having a length of 100 mm to 200 mm, a thickness of 0.2 to 5 mm, and a width of 20 mm to 30 mm at the boundary with the handle part, and the spatula part is possess one or more ink quantitative mark, the ink quantity determining at least one or more of the marks, V-shaped, U-shaped, and a notch of trapezoidal shape or U-shape, the The width of the spatula portion in the notch is not less than ½ of the width in the boundary portion with the handle portion .
The invention according to claim 2 is the spatula for ink according to claim 1, wherein the spatula portion is made of a printing ink resistant plastic material having a flexural modulus of 3 to 50 ton / cm ^2. Consisting of a substantially flat surface and a back surface having a tapered shape that becomes thinner from the center line portion in the long side direction of the spatula portion toward the tip portion in the long side direction and the edge portion in the short side direction of the spatula portion, The tip part and the edge part have a thickness of 0.2 to 0.5 mm.
The invention according to claim 3 is the spatula for ink according to any one of claims 1 or 2 , wherein at least one of the marks for determining the amount of ink is formed on the surface. The marking is composed of two or more lines facing the edge of the spatula,
It is characterized by that.
The invention according to claim 4 is the spatula for ink according to any one of claims 1 to 3 , wherein the tip of the spatula is curved in an arc shape toward the handle portion side. It is characterized by having a notch.

  According to the first, third, and fourth aspects of the invention, since the amount of ink on the spatula can be grasped by the quantitative mark formed on the spatula, it is possible to supply an appropriate amount of ink on the printing plate. Become.

  According to the invention of claim 2, by using a printing ink-resistant plastic material having a certain bending elasticity as a material of the spatula part and making the spatula part into a blade-like shape, the ink is efficiently contained in the ink container. Can be stirred and can be supplied to and removed from the printing plate.

  According to the fifth aspect of the present invention, since the tip end portion is divided into two forks by the arc-shaped notch at the tip end portion of the spatula portion, the tip end portion comes into linear contact with the bottom of the raised ink container. The ink at the bottom of the ink container can be efficiently scooped up.

Front view (a), rear view (b), side view (c), and boundary X ₀ -X of handle portion and spatula portion of ink spatula according to Embodiment 1 of the present invention. sectional view of the ₀ and (d), is a cross-sectional view of the tip vicinity of _X 1 -X ₁ of the spatula part (e). It is a principal part figure of the spatula part of the ink spatula based on Embodiment 1 of this invention. It is a use condition figure of the spatula for ink based on Embodiment 1 of this invention. It is a principal part figure of the spatula part of the ink spatula based on Embodiment 2 of this invention. It is a principal part figure of the spatula part of the ink spatula based on Embodiment 2 of this invention. It is a principal part figure of the spatula part of the ink spatula based on Embodiment 2 of this invention. It is a principal part figure of the spatula part of the ink spatula based on Embodiment 2 of this invention. It is a front-end | tip part figure of the spatula part of the ink spatula based on Embodiment 3 of this invention. It is a use condition figure of the spatula for ink based on Embodiment 3 of this invention.

Embodiment 1
Embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a front view (a), a rear view (b), a side view (c), and a cross-sectional view taken along line X ₀ -X ₀ (d) of the ink spatula 1 according to the first embodiment. And X ₁ -X ₁ cross-sectional view (e). First, the ink spatula 1 includes a handle portion 2 and a spatula portion 3 connected to the handle portion 2.

  The handle portion 2 is for an operator to grip and work when using the ink spatula 1 and has a length of 100 to 150 mm, a width of 10 to 30 mm, and a thickness of 10 to 10. This is a 20 mm rod having a substantially rectangular parallelepiped shape, and the specific size is appropriately adjusted so that it is easy for the operator to handle. In the first embodiment, the length is 130 mm, and the width is 28 mm near the root (boundary with the spatula portion 3), and becomes narrower as it approaches the tip, and near the tip is 15 mm. The thickness was set to 15 mm. The material of the handle portion 2 can be selected from various types such as metal, plastic, and wood. In the first embodiment, as described later, the same material as the spatula portion 3 is used.

  An engagement hole 21 that is a through hole having a diameter of 10 mm is formed near the tip of the handle portion 2. The engagement hole 21 is for engaging with a hook or the like installed on a wall or equipment when the ink spatula 1 is not used.

  The spatula part 3 is connected to the handle part 2 and is a part that actually handles ink. The spatula portion 3 has a length of 100 mm to 200 mm, a thickness of 0.2 to 5 mm, and a width of 20 mm to 30 mm at the boundary with the handle portion 2, and has a front surface 31a and a back surface. 31b. The surface 31a has a substantially flat shape and is a surface for actually handling ink, such as placing ink or stirring the ink. As shown in FIGS. 1C, 1 </ b> D, and 1 </ b> E, the back surface 31 b extends from the center line portion in the long side direction of the spatula portion 3 to the edge portion 32 in the short side direction and the long side direction of the spatula portion 3. It has a tapered shape that becomes thinner toward the distal end portion 33. And the thickness of the edge part 32 of the front-end | tip part 33 is 0.2-1.0 mm, and is suitably set by the bending elastic modulus of the plastic material used so that ink can be handled appropriately. In this Embodiment 1, the spatula part 3 is 140 mm in length. In order to facilitate handling, the width and the thickness become thinner and thinner from the boundary with the handle portion 2 toward the tip. That is, the width was set to 30 mm near the boundary with the handle 2, 25 mm near the tip 33, the thickness was set to 7 mm near the boundary with the handle 2, and 1.5 mm near the tip 33.

The material of the spatula 3 is a printing ink resistant plastic material having a flexural modulus of 3 to 50 ton / cm ² . In the case of a plastic material having a flexural modulus of 3 ton / cm ² or less, it becomes easy to bend unless the thickness of the edge part of the spatula part 3 is 0.5 mm or more, and the solder paste cannot be sufficiently removed. Moreover, the thickness of the center line part of the spatula part 3 must be increased to 5 mm or more. Further, since a plastic material having a flexural modulus of 50 ton / cm ² or more is too hard, the edge of the spatula portion 3 is particularly thin with a thickness of 0.2 to 0.5 mm, which is not preferable because the mask plate is damaged. .

Examples of plastic materials having a flexural modulus of 3 to 50 ton / cm ² and printing ink resistance include polyethylene, polypropylene, 4-methylpentene-1, polyoxymethylene, polybutylene terephthalate, polyethylene terephthalate, nylon, polyurethane, poly Examples include tetrafluoroethylene and polyacetal. When the spatula portion 3 and the handle portion 2 are integrally formed, melt-moldable polyethylene, polypropylene, 4-methylpentene-1, polyoxymethylene, polybutylene terephthalate, polyethylene Preference is given to terephthalate, nylon and polyacetal. In the first embodiment, polypropylene is used to integrally form the handle portion 2 and the spatula portion 3.

  Further, as a method for forming the spatula portion 3, in addition to methods generally used for resin molding such as an injection molding method and a compression molding method, a method of forming a material by machining it and a method of forming it by a 3D printer can be used. In the present embodiment, an injection molding method is used in consideration of productivity and molding accuracy.

  Next, as shown in FIG. 2, one or more ink quantitative marks 34 are formed on the surface 31a of the spatula portion 3 as an index for properly collecting ink on the surface 31a. In the first embodiment, the ink fixed amount mark 34 is formed by a V-shaped notch and is formed one by one at the position where the edge portions 32 on both sides face each other. Here, in FIG. 2, dotted lines U, C, and L are virtual lines described in the figure for convenience of explanation, and a dotted line L passing through one end on the V-shaped tip portion 33 side is a minimum line, A dotted line C passing through the center of the V shape means a target line, and a line U passing through the other end of the V point means a maximum line. That is, when collecting ink, the amount of ink within a certain range is always collected by storing ink between the front end portion 33 and the dotted lines L to U. The specific amount (mass, volume) of the collected ink varies depending on the physical properties (density, viscosity, etc.) of the ink, and is set for each ink. If the ink has similar physical properties, approximately the same mass or volume is collected, so there is no need to set each time.

  The position of the ink quantitative mark 34 determines the amount of ink to be quantitatively collected, and is adjusted to an appropriate position in consideration of the physical properties of the ink and the amount of ink necessary for printing. That is, the closer the ink fixed mark 34 is to the tip 33, the less ink is collected, and the farther it is, the more ink is collected. In the first embodiment, in order to collect 80 g of ink, the center of the ink fixed amount mark 34 (corresponding to the dotted line C) is set at a position 40 mm from the tip 33.

  The size of the ink fixed mark 34 can be set arbitrarily, but in order to maintain the rigidity of the spatula 3, the width of the spatula 3 on the dotted line C passing through the center of the V-shape is At least 1/2 of the width at the boundary with the handle portion 2 is necessary. In the first embodiment, the former is set to 23 mm and the latter is set to 30 mm. The distance between both ends of the V-shape (the distance between dotted lines U and L) was set to 10 mm.

  Next, an ink collection method using the ink spatula 1, which is the operation of the ink spatula 1 according to the first embodiment, will be described with reference to FIG.

  Here, a case where a certain amount of the conductive paste P is collected from the ink container will be described. In FIG. 3, when the conductive paste P does not cover the dotted line L, that is, one end of the ink fixed amount mark 34 on the tip end 33 side as shown in FIG. 3A, the conductive paste P is insufficient. Further, as shown in (b), when it is in the dotted line C, that is, in the vicinity of the center of the ink fixed amount mark 34, it means that an appropriate amount of the conductive paste P is collected. Furthermore, as shown in (c), when it passes over the dotted line U, that is, the other end side of the ink fixed amount mark 34, it indicates that the conductive paste P is collected excessively.

  According to the first embodiment, since the amount of ink on the spatula 3 can be grasped by the quantitative mark 34 formed on the spatula 3, it is possible to supply an appropriate amount of ink on the printing plate. .

  In addition, by using a printing ink-resistant plastic material having a certain bending elasticity as the material of the spatula part 3 and making the spatula part 3 into a blade shape, the ink can be efficiently stirred in the ink container, and printing can be performed. It is possible to supply and remove the plate.

Embodiment 2
4 to 7 show the main part of the spatula portion 3 of the ink spatula 1 according to Embodiment 2 of the present invention. Here, the main difference between the second embodiment and the first embodiment is the form of the ink fixed amount marks 35 to 37, which will be mainly described. In addition, the code | symbol and description of drawing are abbreviate | omitted for the structure similar to Embodiment 1. FIG.

  In FIG. 4, the ink fixed amount mark 35 is a U-shaped notch formed so as to face the spatula portion 3, and one end on the U-shaped tip portion 33 side is a dotted line as in the first embodiment. L (lowest line), the center indicates a dotted line C (target line), and the other end indicates a dotted line U (highest line). Here, the size and position of the ink fixed amount mark 35 are set according to the same policy as in the first embodiment.

  In FIG. 5, the ink fixed amount mark 36 is a U-shaped notch formed so as to face the spatula portion 3, and, as in the first embodiment, one end of the U-shaped tip portion 33 side. Indicates a dotted line L (lowest line), a center indicates a dotted line C (target line), and the other end indicates a dotted line U (highest line). Here, the size and position of the ink fixed amount mark 36 are set according to the same policy as in the first embodiment.

  In FIG. 6, the ink fixed amount mark 37 is a trapezoidal notch that is formed by disposing the spatula portion 3 so as to extend the U-shape of FIG. 5. As in the first embodiment, one end of the U-shaped tip 33 side is a dotted line L (lowest line), the center is a dotted line C (target line), and the other end is a dotted line U (highest line). Here, the size and position of the ink fixed amount mark 37 are set according to the same policy as in the first embodiment.

  Unlike the first embodiment, the ink fixed amount mark 37 has two lowest and highest lines and does not have a target line. That is, in FIG. 6, the highest line (dotted line U1) and the lowest line (dotted line L1) are on the handle 2 side, and the other highest line (dotted line U2) and lowest line (dotted line L2) are on the tip 33 side. Yes, there is no equivalent to the target line (dotted line C).

  In this case, the first quantitative level is formed in the region sandwiched between the dotted lines U2 and L2, and the second quantitative level is formed in the region sandwiched between U1 and L1. The second quantitative level can quantify an amount of ink greater than the first quantitative level. That is, the ink spatula 1 in FIG. 6 can perform two levels of quantification with a single ink quantification mark 37.

  In FIG. 6, as in the first embodiment, the size of the ink quantitative mark 37 is such that the width of the spatula portion 3 in the trapezoidal notch is the boundary with the handle portion 2 in order to maintain the rigidity of the spatula portion 3. More than 1/2 of the width in the portion is necessary. In FIG. 6, the former is set to 23 mm and the latter is set to 30 mm. The interval between the dotted lines U1 and L2 was set to 23 mm, and the interval between U2 and L1 was set to 10 mm.

  In FIG. 7, the ink determination mark 38 is a mark formed on the surface 31a. The stamp 38 is composed of two or more lines that are directed in the direction of the edge of the spatula 3 (the short side direction of the spatula 3). In FIG. 7, it is formed by three lines.

  Here, the lowest line, the target line, and the highest line are actually formed on the spatula portion 3 unlike the embodiments described above. Therefore, here, they are referred to as line U, line C, and line L.

  For convenience of identification, the lines U and L are formed by broken lines, and the line C is formed by a solid line. Of course, other combinations and line types may be used. The thickness, depth, or height of the line is preferably 0.2 to 1 mm in view of visibility and handleability. If it is thinner (shallow) than 0.2 mm, it is difficult to visually recognize it. If it is thicker (deep) than 1 mm, the ink will be caught by the line and it will be difficult to remove, and the handling will be impaired. In FIG. 7, the thickness and depth were set to 0.5 mm.

  According to the second embodiment, since the amount of ink on the spatula 3 can be grasped by the quantitative marks 35 to 38 formed on the spatula 3, it is possible to supply an appropriate amount of ink on the printing plate. It becomes.

  In addition, by using a printing ink-resistant plastic material having a certain bending elasticity as the material of the spatula part 3 and making the spatula part 3 into a blade shape, the ink can be efficiently stirred in the ink container, and printing can be performed. It is possible to supply and remove the plate.

Embodiment 3
FIG. 8 shows the main part of the spatula part 3 of the ink spatula 1 according to Embodiment 3 of the present invention. Here, the main difference between the third embodiment and the first embodiment is the shape of the distal end portion 33, which will be mainly described. In addition, the code | symbol and description of drawing are abbreviate | omitted for the structure similar to Embodiment 1. FIG.

  In the third embodiment, the distal end portion 33 of the spatula portion 3 is formed with an arc-shaped notch 331 that is curved toward the handle portion 2 side, and the distal end portion 33 has a bifurcated form. Yes. The notch 331 is formed to fit the shape of the bottom of the ink container C.

  Next, an ink collection method using the ink spatula 1, which is the operation of the ink spatula 1 according to the third embodiment, will be described with reference to FIG.

  FIG. 9 shows a schematic internal configuration in a state where the ink spatula 1 is inserted into the ink container C, and a small amount of the conductive paste P remains on the bottom of the container.

  Further, the bottom of the ink container C is raised in a convex shape toward the center.

  In the ink spatula 1 according to the third embodiment, since the tip end portion 33 has an arc-shaped cutout 331, when the tip end portion 33 comes into contact with the bottom of the ink container C, it can be fitted to the bottom.

  By sliding the ink spatula 1 against the bottom and side walls of the ink container C while sliding the ink container C, the conductive paste P remaining on the bottom is effectively collected.

  According to the third embodiment, since the tip portion is divided into two forks by the arc-shaped notch 331 of the tip portion 33 of the spatula portion 3, the tip portion 33 of the ink container C whose bottom is raised to a convex shape. Since it is in linear contact with the bottom, the conductive paste P in the ink container C can be efficiently collected.

  While the first to third embodiments have been described above, the present invention is not limited to this. For example, in the above-described embodiment, one ink fixed amount mark 34 to 38 is provided on both sides of the edge portion 32. However, this may be provided on one side or two or more on either side. Here, when two or more are provided on one side or both sides of the edge portion 32, it is possible to increase the level at which the amount of ink can be determined with one spatula 1 for ink.

  In addition, different amounts of ink quantitative marks 34 to 38 may be provided on one ink spatula 1.

  In the case of the ink fixed amount mark 37 in FIG. 6, a target line may be visualized by providing a mark such as C of the ink fixed amount mark 38 between U1 and L1 and U2 and L2.

  Further, in the third embodiment, the marking 38 is not limited to a line, and may take other forms as long as it has visibility such as symbols, numbers, and characters. Moreover, a convex shape may be sufficient.

DESCRIPTION OF SYMBOLS 1 Ink spatula 2 Handle part 3 Spatula part 31a Front surface 31b Back surface 32 Edge part 33 Tip part 331 Notch 34, 35, 36, 37, 38 Ink fixed amount mark

Claims (4)

A spatula for ink used for screen printing,
A rod-shaped handle having a length of 100 mm to 150 mm;
An elongated thin plate-like spatula portion connected to the handle portion, having a length of 100 mm to 200 mm, a thickness of 0.2 to 5 mm, and a width of 20 mm to 30 mm at a boundary portion with the handle portion. ,
The spatula portion may possess one or more ink quantitative marks,
At least one of the ink determination marks is a V-shaped, U-shaped, trapezoidal, or U-shaped notch,
The width of the spatula portion in the notch is 1/2 or more of the width in the boundary portion with the handle portion,
Spatula for ink characterized by that. The spatula portion is made of a printing ink-resistant plastic material having a flexural modulus of 3 to 50 ton / cm ² , and has a substantially flat surface and a center line portion in the long side direction of the spatula portion. It consists of a back surface having a tapered shape that becomes thinner toward the front end portion in the long side direction and the edge portion in the short side direction, and the thickness of the front end portion and the edge portion is 0.2 to 0.5 mm.
The spatula for ink according to claim 1. At least one or more of the ink quantification marks is a mark formed on the surface, and the mark is composed of two or more lines facing the edge portion of the spatula portion.
Wherein the ink spatula according to any one of claims 1 or 2. The tip of the spatula has an arc-shaped notch that is curved toward the handle portion side,
The ink spatula according to any one of claims 1 to 3 , wherein the spatula for ink is used.

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