KR20060116084A - Device to attach back sheet to retroreflective sheet - Google Patents

Abstract

A device for joining a retroreflective sheet and a back sheet is provided to bond the sheets without changing the property by instantaneously melting the retroreflective sheet and the back sheet by ultrasonic wave oscillated from an ultrasonic welder, pressing the sheets by a molding roller, and immediately cooling down the joined sheet in a normal temperature state. The device for joining a retroreflective sheet and a back sheet is composed of a supply part(100) feeding the retroreflective sheet wound around a first supply roll(101) and the back sheet wound on a second supply roll(102) positioned higher than the first supply roll; an ultrasonic welding part(200) having a molding roller(210) rotated by a driving motor(211) and moved up and down by a cylinder(212) and a tool horn(221) of an ultrasonic welder disposed at the bottom part, and welding the retroreflective sheet and the back sheet with ultrasonic wave by the tool horn and the molding roller; a cooling part(300) cooling down the joined sheet welded by the ultrasonic wave by plural blower fans(311,321); a withdrawing part(400) pulling the sheet after fitting the joined sheet between two withdrawing rollers(401,402); and a discharge part(500) winding up the joined sheet by a winding roll(501).

Description

Retroreflective sheeting and backsheet bonding device {Device to attach back sheet to retroreflective sheet}

1 is a perspective view of a retroreflective sheeting and back sheet bonding apparatus according to the present invention.

Figure 2 is a side view of the retroreflective sheet and backsheet according to the present invention.

3 is a perspective view of main parts of the present invention;

4 is a front view of main parts of the present invention;

5 is a main portion use state diagram of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

100: supply unit 101: first feed roll 102: second feed roll

200: ultrasonic welding portion 201: support frame 202: support plate

203: support rod 204: top plate 205: forming roller support plate

206: lifting plate 210: forming roller 211: drive motor

212 cylinder 213 piston rod 215 molding roller bracket

220: ultrasonic welding machine 221: tool horn 222: vibration part

223: main horn 300: cooling unit 310: first cooling unit

311,321: Blowing fan 320: Second cooling part 400: Drawing part

401: upper drawing roller 402: lower drawing roller 403: drawing motor

500: discharge part 501: winding roll 600: tension holding part

601: upper roller 602: lower roller 700,800: guide rod

701,801: Base R: Retroreflective Sheet B: Backsheet

The present invention relates to a device for bonding a retroreflective sheet and a back sheet, and more particularly, a series of continuous systems for easily bonding a retroreflective sheet and a back sheet through an ultrasonic welding machine without a separate adhesive material. To reduce manufacturing costs and improve productivity.

Generally, the retroreflective sheet has a surface layer formed inside of a plastic prism or a reflecting tube corner, and has a characteristic of totally reflecting most incident light in the forward direction. It is used as a product for reflecting incident light such as a seat belt.

Such a retroreflective sheet has reflection characteristics in itself, but the sheet of synthetic resin is attached to the back surface to exhibit a larger reflection characteristic, which is called backsheet.

However, when bonding a retroreflective sheet and a backsheet, an adhesive such as a bond is required to increase a manufacturing cost due to a large amount of adhesive. In the process of bonding, the adhesive is adsorbed into the retroreflective sheet and the backsheet. There is a problem of greatly reducing the flexibility of the retroreflective sheet product, and in particular, since the adhesive force varies depending on the type of adhesive, there is a problem that it is difficult to select the adhesive.

To improve this, the back sheet is made of heat-resistant PET resin, and the hot sheet is coated on the back of the retroreflective sheet while the hot sheet is melted by heat to heat the back sheet. In some cases, the back sheet is bonded to each other, but in this case, the PET resin is expensive, and the overall cost of the product is increased, and expensive hot melt material is required. There was a downside to this falling.

The present invention has been proposed in view of this point, and the back sheet made of a low-cost PVC material is bonded to the back surface of the retroreflective sheet as it is through ultrasonic waves without a separate adhesive material without changing the properties of the retroreflective sheet. The purpose of the present invention is to provide a recursive bansi sheet and back sheet bonding apparatus that can reduce manufacturing costs while improving reliability.

In another aspect, the retroreflective sheet and the back sheet wound on each feed roll are continuously fed to ultrasonically fused continuously, and to be wound through the take-up roll to increase productivity.

Hereinafter, the present invention will be described in detail with reference to the embodiments presented and the accompanying drawings.

1 is a perspective view of a retroreflective sheet and backsheet bonding apparatus according to the present invention, Figure 2 is a side view of the retroreflective sheet and backsheet according to the present invention, Figure 3 is a perspective view of the main part of the present invention, Figure 4 5 is a front view of the main portion of the present invention, Figure 5 is a state of use of the main portion of the present invention.

As shown, the retroreflective sheet and backsheet bonding apparatus according to the present invention is a retroreflective sheet (R) wound on the first supply roll 101, and the first position is located higher than the first supply roll 101 A supply unit 100 for supplying the back sheet B wound around the second supply roll 102; The forming roller 210 rotated by the driving motor 211 is configured to be lifted and lowered by the cylinder 212, and a tool horn 221 of the ultrasonic welding machine 220 is disposed at the bottom thereof so that the supplied recursive property is provided. An ultrasonic welding unit 200 for ultrasonically welding the reflective sheet R and the back sheet B by the tool horn 221 and the forming roller 210; Cooling unit 300 for cooling the bonded sheet is ultrasonically fused by a plurality of blowing fans; A pull-out unit 400 which pulls the bonded sheet between two pull-out rollers 401 and 402; It is composed of a discharge part 500 for winding the bonded sheet through the winding roll 501.

In addition, the front of the discharge portion 500 is provided with a plurality of horizontally arranged rollers are provided with a tension maintaining unit 600 to maintain the tension as the discharged sheet is passed through the zigzag, and more efficient, The two upper rollers 601 and the two lower rollers 602 are alternately arranged so that they can be raised so that the bonded sheets run largely between them.

At this time, between the supply unit 100 and the ultrasonic welding unit 200 a plurality of base pieces 701 to guide the supplied retroreflective sheet (R) and the back sheet (B) toward the ultrasonic welding unit 200 side. Guide rod 700 is formed to be slidable, a plurality of support pieces 801 is sliding so as to guide the discharged sheet even between the tension holding unit 600 and the discharge unit 500. The guide rod 800 is formed to be possible.

In addition, a drawer motor 403 is provided under the drawer rollers 401 and 402 so that its power is connected to the lower drawer roller 402 of the drawer rollers 401 and 402, and the upper drawer roller 401 is provided. ) Is provided to be idling at a position close to the lower drawing roller 402.

The ultrasonic welding unit 200 has at least one ultrasonic welding machine 220 is installed on the support plate 202 fixed in the horizontal direction to the support frame 201, the tool horn 221 is fixed in the upward direction, the support plate 202 The upper plate 204 is fixed to the upper end of the support rod 203 fixed in both directions in the vertical direction to the at least one cylinder 212 is installed downward, and to support the forming roller 210 rotatably The forming roller support plate 205 is fixed to the piston rod 213 of the cylinder 212 so that the forming roller 210 can be selectively lifted and lowered. In the present invention, two cylinders 212 and two ultrasonic welding machines ( 220 is shown as an example.

That is, the ultrasonic welding machine 220 is composed of a vibrating unit 222, a main horn 223, a tool horn 221, respectively, the vibrating unit 222 is fixed to the support plate 202, the forming roller 210 is The honeycomb pattern is formed in an arrayed shape, and the forming roller bracket 215 rotatably supporting the forming roller 210 is fixed to the forming roller support plate 205, and the forming roller is formed on the forming roller support plate 205. A drive motor 211 that transmits power to the 210 is seated, and the lifting plate 206 is fixed to the upper portion of the forming roller support plate 205 so that the lifting plate 206 is a piston rod of each cylinder 212. It is fixed to 213 to be able to descend.

In addition, the cylinder 212 to be applied to the present invention may be a pneumatic cylinder or a hydraulic cylinder.

In addition, the cooling unit 300 is composed of a plurality of blowing fans 311 disposed forward in the rear of the tool horn 221 and the first cooling unit 310 for cooling the portion at the same time as the ultrasonic welding of the sheet and The second cooling unit 320 is formed by a plurality of blowing fans 321 disposed upward in front of the discharge unit 500 to finally cool the sheet to be discharged before being wound onto the take-up roll 501. Is made of.

And, although not shown, the discharge unit 500 is preferably provided with a discharge motor so that its power is transferred to the take-up roll 501 to automatically wind the sheet is bonded and discharged.

The retroreflective sheet and backsheet bonding apparatus according to the present invention configured as described above have the following functions.

First, when the retroreflective sheet (R) and the back sheet (B) gradually wound on the respective feed rolls 101 and 102, the back sheet (B) is positioned above the retroreflective sheet (R). It is guided to the ultrasonic welding unit 200 in the state is passed between the tool horn 221 and the forming roller 210 of the ultrasonic welding machine 220.

The forming roller 210 is lowered as the upper cylinder 212 is extended, and the back sheet B and the retroreflective sheet R are interposed between the tool horn 221 and the forming roller 210. Is rotated by the drive motor 211 and the vibrating unit 222 of the ultrasonic welding unit 220 is operated so that ultrasonic waves generated therefrom oscillate upward through the main horn 223 and the tool horn 221. do.

When the ultrasonic wave is oscillated from the tool horn 221, the contact portion between the retroreflective sheet R and the back sheet B is instantaneously melted due to the numerous vibrations of the ultrasonic wave, and thus is pressed by the forming roller 210. The retroreflective sheet (R) and the back sheet (B) may be bonded at the losing portion, and air is blown by the blowing fan 311 of the first cooling unit 310 located behind the tool horn 221. The heat generated by the ultrasonic waves is instantaneously cooled.

In addition, since the forming roller 210 is rotated by the driving motor 211, the bonding of the retroreflective sheet (R) and the back sheet (B) as described above proceeds continuously, as well as the sheet in the bonded state. It is drawn out to the front of the ultrasonic fusion unit 200, and in the front of the ultrasonic fusion unit 200, withdrawal unit 400 consisting of two upper and lower draw rollers 401, 402 is located in the lower extraction roller 402 Is rotated by the drawing motor 403 and the bonded retroreflective sheet (R) and the back sheet (B) is sandwiched between the drawing rollers (401, 402).

The retroreflective sheet (R) and the back sheet (B) bonded through the drawing unit (400) pass zigzag between the upper roller (601) and the lower roller (602) forming the tension maintaining unit (600). While maintaining the tension, it is passed through the tension maintaining unit 600 is sequentially wound on the take-up roll 501 forming the discharge part 500, before the bonded sheet is wound on the take-up roll 501 It is wound on the take-up roll 501 in the final cooling state by the blowing fans 321 of the second cooling unit 320 formed in the front it is possible to maintain the bonded sheet without deformation.

As described above, the present invention is an operation in which the retroreflective sheet and the backsheet are instantaneously melted by the ultrasonic wave oscillated from the ultrasonic welding machine, pressed by the forming roller, and bonded at the site, and immediately cooled to room temperature. The simultaneous operation occurs at the same time so that the retroreflective sheet and the backsheet can be easily bonded without using a separate adhesive material and without changing the characteristics of the retroreflective sheet. Due to the good melting characteristics, it can be made of a PVC resin that is cheaper than PET resin, thereby reducing manufacturing costs as a whole and improving productivity by reducing man-hours.

In addition, since the bonding is made by ultrasonic in the process of automatically supplying and automatically winding the retroreflective sheet and the back sheet, all operations are automated and thus mass production is possible.

Claims (4)

Supply unit for supplying the retroreflective sheet (R) wound on the first supply roll 101 and the back sheet (B) wound on the second supply roll 102 located higher than the first supply roll 102 100; The forming roller 210 rotated by the drive motor 211 is configured to be lifted and lowered by the cylinder 212, and the tool horn 211 of the ultrasonic welding machine 220 is disposed at the bottom thereof so that the supplied recursive property is provided. An ultrasonic welding unit 200 for ultrasonically welding the reflective sheet R and the back sheet B by the tool horn 221 and the forming roller 210; Cooling unit 300 for cooling the bonded sheet from the ultrasonic fusion by a plurality of blowing fans (311, 321); A pull-out unit 400 which pulls the bonded sheet between two pull-out rollers 401 and 402; And Bonding device of the retroreflective sheet and the backsheet, characterized in that it comprises a discharge portion 500 for winding the bonded sheet through the winding roll (501). The method of claim 1, A plurality of rollers 601 and 602 are disposed in front of the discharge part 500 in a horizontal manner, and the tension maintaining part 600 is further provided to maintain the tension as the discharged bonded sheet passes through the zigzag. Joining device of the retroreflective sheet and the back sheet, characterized in that the. The method of claim 1, The ultrasonic fusion unit 200, At least one ultrasonic welding machine 220 is installed on the support plate 202 fixed in the horizontal direction to the support frame 201 so that the tool horn 221 is fixed upward and perpendicular to both sides of the support plate 202. The upper plate 204 is fixed to the upper end of the support bar 203 fixed to the at least one cylinder 212 is installed there, the forming roller support plate 205 for rotatably supporting the forming roller 210 A) is fixed to the piston rod (213) of the cylinder (212) bonding apparatus of the retroreflective sheet and the backsheet, characterized in that configured to move up and down selectively forming roller (210). The method of claim 1, The cooling unit 300, A first cooling unit which consists of a plurality of blowing fans 311 disposed forward in the rear of the tool horn 221 to cool the portion of the retroreflective sheet (R) and the back sheet is ultrasonically fused at the same time. 310, The second cooling unit 320 consisting of a plurality of blowing fans 321 disposed upward in front of the discharge unit 500 to finally cool the sheet to be bonded and discharged before being wound on the take-up roll 501 Bonding device of retroreflective sheet and back sheet.

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