JP2531010B2 - Method of carrying articles and holding tape - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of conveying an article in which a holding tape, in which a large number of articles are adhesively held at a predetermined pitch, is conveyed through a heating step, and a holding tape used for carrying out the method. .

2. Description of the Related Art In the manufacturing process of electronic components, there is a process of conveying a large number of works that are adhesively held at a predetermined pitch on a holding tape. FIGS. 4 (a) and 4 (b) show a conventional example of such a conveying method, in which a large number of works 3 are attached at a predetermined pitch a by a holding tape 2 attached on a conveying plate 1 such as a pallet. The work is carried and held, and the carrying plate 1 and the holding tape 2 are carried to carry the work 3. Here, as the holding tape 2, a low-cost adhesive tape having a base material such as polyester or paper is generally used.

SUMMARY OF THE INVENTION By the way, there are processes for manufacturing electronic components that include a resin curing process such as heating and drying an exterior resin or the like formed on the outer surface of the work 3, and the holding tape 2 made of the above material. If the work 3 is conveyed through the resin curing step by using, the holding tape 2 is largely shrunk during the resin curing step, and the work 3 that has undergone the heating step is misaligned due to heat shrinkage. .. (see FIG. 4 (b)) and pitch deviations (a-.alpha., a-.beta., ...) Occur. If such a pitch shift occurs, there is a drawback that, in the subsequent process, when the work 3 is chucked by a chucking device, the work 3 is not in a desired position, and thus a chucking error or a damage to the work 3 is caused. In addition, there is a drawback that the operating rate decreases.

As a method of solving such a defect, it is possible to manufacture the holding tape 2 with a material having an extremely low heat shrinkage rate such as a polyimide-based material. However, since the holding tape 2 made of such a material is expensive, There is a new drawback that leads to an increase in the cost of electronic parts.

The present invention has been made in view of the above circumstances, and a method of conveying an article that can be conveyed in a state in which a pitch between a large number of articles adhered to a holding tape is maintained even under a high temperature condition, and a holding method used for carrying the same. Intended to provide tape.

Means for Solving the Problems In order to achieve the above object, the present invention is a method for conveying an article in which a large number of articles are adhesively held at a predetermined pitch by a holding tape, and the article is conveyed through a heating step. It is characterized in that the article is prepared by using an adhesive tape which is preheated at a temperature equal to or higher than the heating temperature in the heating step to be heat-shrinked, and thereby the article is adhesively held and conveyed.

Further, the present invention, in a holding tape provided for holding a large number of articles by an adhesive at a predetermined pitch and for delivering the article via a heating step, wherein the holding tape has a heating temperature equal to or higher than the heating temperature in the heating step. It is characterized by comprising an adhesive tape which has been preheated at a temperature higher than that to be heat-shrinked.

Action As described above, when a holding tape is manufactured by the adhesive tape after being heated at a predetermined temperature to be heat-shrinked in advance, and the article is adhesively held and conveyed by this, heat-shrinkage has already occurred in the holding tape. Therefore, even if the holding tape is heated by a heating furnace or the like in the subsequent conveying step, the holding tape does not significantly shrink from the initial state. Therefore, when a large number of articles are adhesively held at a predetermined pitch with the holding tape and conveyed through the heating process, the pitch fluctuation between the articles can be reduced as much as possible.

Example Hereinafter, one example of the present invention will be specifically described according to the ground. FIG. 1 is a drawing showing an embodiment in which the method of conveying an article using a holding tape according to the present invention is applied to a manufacturing process of electronic parts.

A holding tape 2 is attached on a carrying plate (for example, a pallet) 1 that is carried toward a subsequent process on the right side of the drawing, and a large number of vukes 3 ... Are provided on the holding tape 2 at a predetermined pitch a. To be stuck. A heating device 4 including a heating furnace is provided in the transfer area of the work 3. The heating device 4 performs a resin curing step of heating the work 3 and drying the exterior resin formed on the outer surface of the work 3, for example.

The works 3 that have undergone the drying process (heating process) are then conveyed to the position of the chucking device 5, where they are chucked one by one and peeled off from the holding tape 2. The stripped work 3 is inserted into, for example, an automatic machine that automatically performs a mounting process on a substrate.

The holding tape 1 is manufactured by heat-treating a double-sided adhesive tape in advance. Therefore, due to the reason described in the section of the above-mentioned action, even if the holding tape 2 holding the works 3 ... Adhesively is subjected to the heating step, no pitch deviation occurs between the works 3.

In FIG. 2, the vertical axis represents the shrinkage rate [%], the horizontal axis represents the heat treatment temperature [° C], and the holding tape 2 heat-treated at a predetermined heating temperature and heat treatment time is heated at 150 ° C for 1 hour. 6 is a graph showing the relationship between the shrinkage rate of the holding tape 2 and the heat treatment conditions when the resin curing and transporting process is used. However, as the holding tape 2 for the test, an adhesive tape based on polyester which was heat-treated under a predetermined heating condition was used.

As is clear from FIG. 2, when the heat treatment is performed at a temperature of 125 ° C. or higher, the shrinkage rate of the holding tape 2 becomes 1% or less. Therefore, when the holding tape 2 is made of the adhesive tape that is heat-treated at a heating temperature of 120 ° C. or higher, the pitch deviation generated between the works 3 in the conveying process under high temperature conditions can be reduced as much as possible.

The material of the adhesive tape is not limited to the one using polyester as the base material, and various heat treatment conditions according to the material of the base material, the thickness of the base material tape, the heating conditions during the carrying process, etc. may be used. By setting, various holding tapes having excellent dimensional stability under high temperature conditions can be realized. In particular, heat treatment of an adhesive tape made of an inexpensive base material such as polyether can provide dimensional stability similar to that of a holding tape made of a polyimide base material. It is extremely effective in reducing costs.

In addition, when a polyimide-based material is used as the base material, the shrinkage rate can be dramatically reduced, so especially when it is used in the transfer process where positioning between the works 3 is required with high accuracy (± 0.2% or less). It becomes effective.

Modification Example FIG. 3 shows a modification example of the present invention. In this modification example, the work 3 is made up of the holding tape 2 obtained by heat-treating the single-sided adhesive tape.
To take the form. That is, in this modified example, the carrying plate 1 is not used, and only the holding tape 2 to which the works 3 are adhered is carried to carry the works 3.

According to such a modified example, there is an advantage that the structure of the conveying means can be simplified.

In the above embodiment, the case where the present invention is applied to the carrying step in the manufacturing process of the electronic component is described, but the carrying object is not limited to the work as described above, and the heat treatment is required during the carrying step. It can be widely applied to the transportation process of general articles.

Advantageous Effects of Invention According to the article transporting method of the first aspect, it is possible to reduce the pitch deviation between the articles that have undergone the heating step. Therefore, the positioning accuracy between the articles can be improved, the chucking operation and the like of the articles in the post-process can be performed quickly and surely, and there is no occurrence of quality problems such as damage to the articles. Further, there is an advantage that the operating rate can be improved and the cost of the article can be significantly reduced.

According to the holding tape of the second aspect, it is possible to realize an inexpensive holding tape having excellent dimensional stability at high temperatures.

[Brief description of drawings]

FIG. 1 is a drawing showing a method of transporting an article using a carrier according to the present invention, and FIG. 2 is a predetermined heating temperature in which the vertical axis represents shrinkage rate [%] and the horizontal axis represents heat treatment temperature [° C.]. , The holding tape that has been heat-treated for the heat treatment time is heated to 150 ° C and the treatment time is 1
FIG. 3 is a graph showing the relationship between the shrinkage rate of the holding tape and the heat treatment conditions when it is used in the resin curing and conveying step for a certain time, and FIG. 3 is a drawing showing a modified example of the present invention. FIG. 4 is a drawing showing a conventional conveying method. 1 ... Transport plate, 2 ... Holding tape, 3 ... Work, 4 ... Heating device, 5 ... Chucking device.

Claims (2)

(57) [Claims] 1. A method of conveying an article, wherein a large number of articles are adhesively held by a holding tape at a predetermined pitch and conveyed through a heating step, wherein the holding tape has a temperature equal to or higher than a heating temperature in the heating step. A method of transporting an article, which is produced by using an adhesive tape that has been preheated and heat-shrinked by the above method, and thereby the article is adhesively held and transported. 2. A holding tape provided for holding a large number of articles with a predetermined pitch by adhesion and conveying the articles via a heating step, wherein the holding tape has a temperature equal to or higher than a heating temperature in the heating step. A holding tape comprising an adhesive tape which is preheated at the above temperature and heat-shrinked.