WO1997013636A1 - Method of manufacturing packaging cushioning material - Google Patents

Abstract

Purpose: a cushioning material used for packaging work is manufactured by filling a tubular synthetic resin tube, in which air introduction ports have been made in advance, with air by suction-expanding the tube by vacuum suckers, so as to form a hollow body continuously. Constitution: first, a synthetic resin tube in which air introduction ports have been made at regular intervals in advance is sucked by two pairs of vacuum suckers, and the air is then introduced into the tube by moving the vacuum suckers outward with the tube left sucked thereto. The portions of the resultant tube which are on the front and rear sides of the air introduction ports are thermally fused by intersecting sealers to seal the air in the tube. The central portion of a hollow body, the air introduction ports of which have been sealed by the intersecting sealers, is thermally fused by a longitudinally moving sealer so as to divide the hollow body into two. Cushioning materials used for packaging work are formed continuously as the inner pressure of the hollow bodies is increased.

Description

 Specification

 [Title of the Invention] Manufacturing method of cushioning material for packing

 DETAILED DESCRIPTION OF THE INVENTION

 [Industrial applications]

 The present invention relates to a method for manufacturing a cushioning material for packing.

 [Prior art]

 The present invention is a partial improvement of the same invention as previously filed, one international application JCTZJP944-101811. In the manufacturing method of this application, a hole for introducing air into a cylindrical synthetic resin tube is made, air is introduced into the tube, and then the front and rear of the hole are welded to form a cushioning material for packing. Was manufactured. However, in the present invention, the method of omitting the drilling step and producing the hollow body more easily is adopted.

 [Means for Solving the Problems]

 In order to solve these problems, the manufacturing method of the present invention uses a synthetic resin tube in which holes for introducing air are opened at predetermined intervals. This has made it possible to omit the step of drilling holes for introducing air from the previously applied manufacturing method. In addition, a detection mark was printed on the synthetic resin tube in order to reliably detect the perforated portion.

 【Example】

 FIG. 1 shows a schematic configuration of a hollow body manufacturing apparatus according to the present invention. First, the outline of the manufacturing method of the present invention will be described with reference to FIG.

 In FIG. 1, a synthetic resin tube 1 in which holes for introducing air are preliminarily formed at regular intervals is drawn out while being sandwiched by a draw-out roller 3 connected to a drive unit.

 The pull-out roller 3 is driven by detecting the positioning mark 91 printed on the synthetic resin tube 1 by the photoelectric tube 2, and the previously introduced air introduction hole 90 is drawn out to the center of the transverse sealer 5. Stop when

Next, two pairs of vacuum adsorbers 4 and 6 that move up and down move so as to expand the synthetic resin tube 1 while adsorbing it, reduce the air pressure in the tube, and use the pressure difference to make the air inlet From 90, air is introduced into the synthetic resin tube 1. Subsequently, the heated transverse sealer 5 is brought into close contact, and is welded so as to cover the front and rear of the air introduction hole 90 of the synthetic resin tube 1 filled with air. At the same time, the heated longitudinal sealer 7 is also brought into close contact, and the central part of the hollow body welded forward and backward by the transverse sealer 5 is welded to increase the internal pressure of the hollow body.

 Next, the suction of the vacuum adsorber is released, and the draw-out roller 3 and the discharge roller 8 are driven to transfer the synthetic resin tube 1 by two hollow bodies in the discharge direction.

 By repeating these operations, a hollow body for packing is continuously formed.

 [Description of each part]

 The synthetic resin tube 1 is a polyethylene or polypropylene tube in which the air introduction holes 90 are formed at intervals of two hollow bodies at the time of completion, and the positioning marks 91 are printed at the same intervals. is there. From the standpoint of strength and economy, this tube preferably has a membrane pressure of about 40 m to 60 m and a flat tube width of about 30 mm to 60 mm.

 The photoelectric tube 2 detects a positioning mark 91 printed on the synthetic resin tube 1.

 The pull-out roller 3 is composed of a pair of upper and lower rollers, and the lower roller is fixed to the structure and is connected to a driving unit not shown in the figure. The upper door moves up and down and can be pulled out while sandwiching the synthetic resin tube 1. The vacuum adsorber 4 is composed of a pair of adsorbers that move up and down. The adsorber has a structure having a vacuum inlet 41 and a suction hole 42, as shown in FIG. The vacuum inlet 41 is connected to the vacuum generator by a soft tube. With this structure, the device expands in the vertical direction while adsorbing the upper and lower surfaces of the flat synthetic resin tube 1.

 The transverse sealer 5 includes a pair of upper blocks 5a and lower blocks 5b that move up and down, respectively. Further, the transverse sealer 5 is installed on the downstream side of the vacuum adsorber 4 with respect to the transfer direction of the synthetic resin tube 1.

As shown in Fig. 3 (A), the upper block 5a is formed by tapering the lower part, A groove 51 is formed in the center to provide a sealing portion 52a.52b.

 The lower block 5b has the same shape as the upper block 5a, as shown in Fig. 3 (C), and the central groove 54 and the sealing parts 55a, 55b are provided on the upper side. ing. In addition, a hole 56 is provided in the center of the lower block, and a mold heater 57 is inserted into this hole 56 so that the entire lower block can be heated to a temperature required for sealing. It has become. Furthermore, the entirety of the sealing portions 55a and 55b is covered with a Teflon heat insulating film 58 so that the heat of the lower block does not directly contact the synthetic resin tube 1 during welding. The insulation film 58 is attached to the lower block with a screw by a stopper 59 made of a thin metal plate.

 The transverse sealer 5 is a single device with an upper block and a lower block as described above.When welding the synthetic resin tube 1, both the upper and lower blocks come close together, and the sealing sections 5 2a and 5 5a , 52b and 55b are in close contact. The vacuum adsorber 6 has exactly the same structure as the vacuum adsorber 4, and operates in the same manner as the vacuum adsorber 4 while adsorbing the flat synthetic resin tube 1 and expanding in the vertical direction. This is a device for introducing air into the air. The vacuum adsorber 6 is installed downstream of the transverse sealer 5 with respect to the transfer direction of the synthetic resin tube 1.

 The structure of the longitudinal sealer 7 is exactly the same as the transverse sealer 5. The operation is different from the transverse sealer 5 and moves in the horizontal direction with respect to the transfer direction of the synthetic resin tube 1. In the vertical cross section 7, the upper block 5a of the crossing block 5 becomes the left block 7a, and the lower block 5b becomes the right block 7b. The function of the longitudinal sealer 7 is to further seal the central portion of the hollow body formed by the transverse block 5 and increase the internal pressure of the hollow body.

As shown in Fig. 6, the discharge roller 8 is composed of four rollers 81, 82, 83, 84 whose surface layer is made of a flexible material. Of these shafts, 81a and 82 a is connected to the drive and fixed to the structure, but 83a and 84a are free rollers, always soft towards the center of the space 85 surrounded by these axes It is pressed with a panel. By changing the inner space 85 surrounded by four mouths according to the shape of the continuously formed hollow body, the soft hollow body is not broken, It has a structure that allows for smooth discharge.

 The installation distance between the transverse sealer 5 and the longitudinal sealer 7 is set to 3 It is desirable to set the distance for each piece. Other devices may be appropriately installed at a position where the hollow body is easily manufactured.

 [Description of manufacturing process]

 Next, a method for manufacturing a hollow body of the present invention will be described in the order of steps with reference to a state diagram (FIGS. 7 to 9).

 The first step is a step of pulling out the synthetic resin tube 1 in which the air introduction holes have been opened at regular intervals to a predetermined position using the positioning mark 91 as a guide.

 Drive the pull-out roller 3 to pull out the synthetic resin tube 1 into the device. When the photoelectric tube 2 detects the positioning mark 91 printed on the synthetic resin tube 1, the drawing roller 3 is stopped to stop the drawing of the synthetic resin tube 1. The position of the photoelectric tube 2 is adjusted and installed so as to stop at the center of the air introducing hole 90 force crossing sealer 5 that has been previously drilled.

 The second step is a step of expanding the flat synthetic resin tube 1. The suction portions 4a and 4b of the vacuum suction device 4 and the suction portions 6a and 6b of the suction device 6 approach the upper and lower surfaces of the drawn synthetic resin tube 1 so that the respective surfaces are suctioned. (Fig. 7-B)

 When the adsorber 4 and the adsorber 6 are expanded upward and downward while the synthetic resin tube 1 is being adsorbed, the air pressure in the tubes is reduced. Thus, air is introduced into the synthetic resin tube 1. (Figure 7-C)

 The third step is a step of hermetically welding so that the introduced air does not leak.

The upper block 5a and the lower block 5b of the transverse sealer 5 are moved toward the synthetic resin tube 1 into which air is introduced. The sealing sections 52a and 52b of the upper block and the sealing sections 55a and 55b of the lower block are in contact with each other, and the two welds shown in Figure 5—A 9 2a, 9 2b are formed. (Figure These two welds 92a and 92b are formed on both sides of the air inlet hole 90 previously drilled as shown in Fig. 5-A, and the air introduced into the synthetic resin tube 1 is formed. Acts to seal off.

 The fourth step is a step of transferring the welded synthetic resin tube 1.

 After the third step, the vacuum adsorbers 4 and 6 stop the adsorbing operation, and open the synthetic resin tube 1 from the adsorber. At the same time, 5a and 5b of the transverse sealer 5 are also separated to the upper and lower limits. (Fig. 8—A)

 Next, the drive device of the pull-out roller 3 and the discharge roller 8 is operated to transfer the synthetic resin tube 1 in the discharge direction until the next detection mark 91 is detected by the photoelectric tube 2. The positioning mark 91 and the air introduction hole 90 are processed in advance so that the transfer length is equivalent to two hollow bodies at the time of completion. (Fig. 8—B)

 The fifth step is a step of increasing the internal pressure of the hollow body by re-welding the central part of the hollow body having the length of two pieces at the time of completion with the longitudinal sealer 7 It is. The timing of this step is performed simultaneously with the third step.

 The left block 7a and the right block 7b of the vertical sealer 7 were brought closer from the horizontal direction to the hollow body that had both ends welded and the air was sealed. — Weld as shown in B. (Fig. 9-1 C and D)

 The hollow body processed by the transverse sealer 5 is divided into two parts by this welding, and the volume is reduced. However, since the amount of sealed air does not change, the internal pressure of each hollow body will increase. Through this process, the hollow body can obtain sufficient elasticity as a cushioning material for packing, and can have a high shock absorbing power against impact.

 Figures 8-C, D, and 9-A, B in the phase diagram show the process by which the hollow body sealed by the transverse sealer 5 is manufactured. The hollow body welded at both ends by the transverse sealer 5 has a length of two when completed.

Figure 8-C shows the second step, in which each vacuum adsorber was brought into close contact with the tube to introduce air into the synthetic resin tube. Figure 8—D shows that in the second step, each vacuum adsorber is expanded Has just been introduced.

 Figure 9-A shows the third welding step.

 Figure 9-B shows the completion of the third step.

 [Specific examples of dimensions in the manufacturing method]

 The positional relationship between the components is as follows when a hollow body is manufactured using a synthetic resin tube made of polyethylene and a tube with a thickness of 4 Om and a flat width of 5 Omm. .

 1. The positional relationship of the vacuum adsorber should be 5 mm between 4a and 4b and between 6a and 6b in the closest position, and the farthest distance should be 20mm.

 2. The vacuum adsorbers 4 and 6 should be installed at intervals of 120 mm with respect to the transfer direction of the synthetic resin tube 1.

 3. Regarding the installation relationship of the transverse sealer 5 and the longitudinal sealer 7, it is preferable to install them at intervals of 180 mm with respect to the transfer direction of the synthetic resin tube 1.

 -The transfer distance between the drawer roller 3 and the discharge roller 8 is 120 mm in one process. The transfer speed is preferably about 6 Omm / sec.

 [Effects of the present invention]

 The present invention is a method in which a hollow body is manufactured while expanding an inexpensive synthetic resin tube while expanding, and the inner part is sealed again to increase the internal pressure of the hollow body. Can be manufactured.

 Since the structure is simple and no power source other than electricity is required, a portable manufacturing device can be easily manufactured. This makes it possible to produce as large a buffer material as needed at the site of use, without the need for transportation or storage.

 Since the hollow body has a shape close to a regular tetrahedron, it can be bent in all directions, and can accommodate any shape of packaged goods.

 As described above, the present invention has a number of effective features.

 [Brief description of the drawings]

FIG. 1 is a state sectional view showing an example of the arrangement of the entire apparatus used in the manufacturing method of the present invention. FIG. 2 is an example of a vacuum suction device used in the present invention.

 (A) is a partial sectional perspective view.

 (B) is a bottom view.

 FIG. 3 is an example of a transverse sealer used in the present invention.

 (A) is a side view of the upper block

 (B) is the bottom view of the upper block

 (C) is a side view of the lower block

 FIG. 4 (A) is a partial cross-sectional view just before the transverse sealer seals the air introduction hole previously drilled in the tube.

(B) is a partial cross-sectional view when the transverse sealer is welded to the tube. _C [Fig. 5] (A) is a plan view showing the sealing state of the air introduction hole by the transverse sealer.

 (B) is a top view which shows the sealing state by the longitudinal sealer. FIG. 6 is an example of an unloading roller used in the present invention.

FIG. 7 is a schematic state diagram of a manufacturing process in the present invention.

 (A) is an initial state of the state.

 (B) is a diagram showing a state in which a vacuum adsorber is brought into close contact with the synthetic resin tube in order to introduce air into the tube.

 (C) is a state diagram of the process of introducing air by expanding the tube.

 (D) is a state diagram of the step of sealing and welding the air introduction hole.

FIG. 8 is a schematic state diagram of a manufacturing process in the present invention.

 (A) is a state diagram after the welding process is completed and before the transfer.

 (B) is a state diagram when the transfer process is completed.

 (C) is a diagram showing a state in which the vacuum adsorber is brought into close contact with the tube in order to introduce air into the synthetic resin tube again.

 (D) is a state diagram of the process of expanding the tube and introducing air following the previous figure.

FIG. 9 is a schematic state diagram of a manufacturing process according to the present invention. (A) is a state diagram of the step of sealing and welding the air introduction hole again.

 (B) is a state diagram after the welding process is completed and before the transfer.

 (C) is a side view of the welding process of the transverse sealer 5 and the longitudinal sealer 7 as viewed from the side after the transfer of the tube has been completed following the previous figure.

(D) is a state diagram in which the state of the preceding figure is viewed from above.

[Explanation of symbols]

 1 Synthetic resin chip 4 1 Vacuum intake

 2 4 2 Suction port

 3 Pull-out roller 5 1 Groove

 4 6 Vacuum adsorber 5 2a 5 2b Sealed section 5 Transverse sealer 5 4 Groove

 7 Longitudinal sealer 5 5a 5 5b Seal processing section 8 Unloading roller 5 6 Heater mounting hole

 5 7

 3a Upper roller 5 8 Insulation seal

 3 b Lower roller 5 9 Stopper

 4a Upper adsorber

 4 b Lower adsorber 8 1 to 8 4 Roller

 5 a Upper block 8 1 a 8 a Axis

 5 b Lower block 9 0 Air inlet

 6 a Upper adsorber 9 1 Positioning mark

 6b Lower adsorber 9 2a, 9 2b weld

 7a Left block 95a, 95b weld

 7 b right block

Claims

The scope of the claims  Claims: 1. A cylindrical synthetic resin tube, whose air introduction holes have been previously drilled at regular intervals, are adsorbed and expanded by a vacuum adsorber, and air is introduced into the tube. A method for producing a cushioning material for packing, characterized in that a hollow body is continuously formed by welding so as to seal.