JPS6169515A - Method and device for treating nose of bundling rope made ofplastic - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application This invention relates to a method and apparatus for treating the tip of a plastic tie rope for use as a carrying strap for a shopping bag.

PRIOR TECHNOLOGY Plastic bundles made from thermoplastic plastics, especially polyolefin films containing polyethylene and polypropylene, are sufficiently hot-stretched and twisted together, and are strong, flexible, and comfortable to hold. Because it is soft and comfortable to touch, it is widely used as a carry strap for commercial paper bags, such as square bottom bags with handles called shopping bags. In this case, it is necessary to fix a relatively hard member to the tip of the tying rope, which will serve as a hanging piece.In this case, as the material for the latching piece, the above-mentioned plastic tying rope is heated and compressed. It is possible to use a string-like body with a thinner diameter and a strong stiffness (Reference I [No. 58-042703]). As a method for fixing the tying rope, the applicant previously proposed a technique in which the tip of the tying rope is overlapped by a predetermined length from the side of the string-like body, and this overlapped part is made fJya by, for example, ultrasonic irradiation. (Patent Application No. 106388/1988).

However, in this method, the tip of the tying rope and the string-like body are overlapped and welded, so that only a part of the circumferential surfaces of the two in the overlapping part contributes to the joining of the two.
Therefore, the welding strength is not necessarily sufficient, and furthermore, the overlapping portion causes high tension.
The problem is that problems tend to occur when attached to a paper bag.

Purpose of the Invention - Therefore, the purpose of the invention of this application is to melt the tip of the tying rope and the side part of the string-like body, and then butt and join them, thereby reducing the total cross-sectional area of the tying rope and the 111 mm of the string-like body. Provided is a method for treating the tip of a tying rope, which provides sufficient bonding strength between the two by welding the two parts, and also provides a tight bond to the cord-like body without causing tension, and an apparatus for carrying out the method. It is about providing.

Structure of the Invention The MII power of the first invention according to the second application to achieve the above object is to melt the tip of the tying rope and the side of the string-like body by bringing them into contact with a single heater, and to melt the tip and the side of the string-like body, The gist of the method is to join the fused parts, and then cool and solidify the joined parts, thereby butting and welding the tip of the bundle and part a of the string-like body. On the other hand, the configuration of the second invention according to this application includes a heater that moves by rubbing the aS of the string-like body and melts the side part thereof, and a tip of the bundle i that contacts the heater and melts it, and further , 111 of the melted string-like body
11 and the tip of the tying rope, and a clamping mechanism that presses and cools the joint part from two directions. The gist is that the method of the invention can be implemented.

Example 1 The first invention will be described in detail below with reference to the drawings.

The process of joining the tip of the plastic binding rope 1 and the string-like body 2 is carried out through each process shown in FIG.

Binding rope 1 is made by excessively twisting stretched polypropylene film to form λF plan a, and the three ropes are connected to Z! III) It is a three-stroke rope with a thickness of about 81 and made by twisting and twisting 9 times (Fig. 4 (a)).
The temperature of the binding rope 1 is 850'C, and the running speed is 35-50.
- Obtained by heat compression treatment in 7 minutes, bulky compression rate 13.0%
l'a High compressive elastic modulus 79.5% (however, the test method is J
According to IS L1096, the initial load was set to 50 g/c+s'+load 300 g/c+a2), and it is a stiff and stiff robe (No. 41j JCb)).

The string-like body 2 is intermittently held in its longitudinal direction by holders 41, 41... and positioned in a substantially straight line, while the binding ropes 1, 1... are held near their tips by a gripping device. i! 30 and is opposed to the string-like body 2 at right angles (@1 (a)). Here is the tie rope 1,1
... and the string-like body 2 form one plane.

The heater 51, whose side surface facing the string-like body 2 is a slope 51i, moves in a direction perpendicular to the plane, contacts the side of the string-like body 2, and melts the same part while rubbing it. (
Fig. 1(b), Fig. 2). The area melted by the heater 51 is aligned with the area where the tip of the tying rope 1 faces.

The gripping device 30 is moved in a direction approaching the string-like body 2 and stopped at a position where the tip of the tying rope 1 reaches and contacts the surface of the heater 51 (FIG. 1(e)). 5
It is melted by 1. Here, the reason why the tip of the tying rope 1 starts melting later than the side part of the string-like body 2 and the latter starts first is because the string-like body 2 has a lower bulk compressibility and a lower melting rate. It's because it's late.

At the same time as removing the heater 51, the gripping device 30 is further moved and stopped at a position where the melted part at the tip of the binding rope 1 is tightly joined to the melted part of the WI part of the string-like body 2 (Fig. 1(d)>
.

Immediately thereafter, the clamping mechanism 60 having the upper clamp piece 61a and the lower clamp piece 61b is used to cool the tip of the binding rope 1 and the side part of the string-like body 2 by lightly pressing the pole (lightly pressed and cooled). 1171(e), tjS3 figure)
.

Each of the above steps is performed using multiple pieces of binding rope of a predetermined length], 1.
If both ends of the line progress at the same time, the rope becomes 1°1...
A ladder-shaped middle 111 with the horizontal member being the horizontal member and the string-like body 2 being the vertical member.
1%! A shopping bag in which the hanging piece 3.3 made of the string-like body 2 is fixed to the wJ waste of the string body made of the tying rope 1 by cutting the cord-like body 2 at the middle of each joining point. You can make a mailing letter (Part 1)
Figure (“), Figure 5).

The surface temperature of the heater 51 is 460±10°C.
The tip of the tying rope 1 is connected to the heater 51 by a cord-like wire.
When the contact with the side of the body 2 is delayed by about 0.5 seconds and the time is set to about 4 seconds, the bonding strength between the tying rope 1 and the hanging piece 3 is as shown in the table below. Sufficient strength and appearance were obtained for use as a hand-sewn bag.

However, the bond strength is the result of a light strength elongation test (Instron method), at a tensile rate of 10 cs/min and a grip interval of 4 c.
-, test 1 is the strength to pull out a knot or joint from a perforated cardboard with a diameter of 71 kg), and test 2 is
diameter? 5 to 6 pieces (kg) of force required to pull out a knot or a joint from a perforated plastic plate of +s mesh, or kg (kg of strength required to break a knot or joint), respectively.
Shown as average values for book samples.

Table Embodiment 2 A light layer processing device for bundling is a heater device l! including a heater 51. 50, a holding device 30 for holding the binding ropes 1, 1, . . . , and a holder 41 for holding the string-like body 2! 40, and each upper and lower clamp piece 61a.

Consists of a clamp puller 10 with 61b (Fig. IJS6)
.

The retainer r1140 has a coarse comb-shaped holder 41.41.
A unit in which a holder plate 42 formed with .
The holders 41, 41, and so on are arranged side by side in an upper and lower set, with the holders 41, 41, and so on facing each other.
It is made to match the distance d at which the tips of ... are joined.

The gripping device 30 has two square shafts 31 and 32 that can slide in opposite directions within a sliding bearing 33, and a flag-shaped tongue piece 31a.

32 m are arranged vertically alternately, and chamfers 31b and 32b are applied to the opposing sides of the top of each tongue piece 31g and 32a (FIGS. 7 and 6).Furthermore, the entire gripping device 30 is , is placed W1 on a table (not shown), and can be set to move vertically and horizontally while remaining parallel to the holding device 40. The interval between the gripping ropes 1 by the tongues 31a and 32m is made to match the interval d.

The heaters 51, 51, . . . have a prismatic shape that protrudes in a row from the lower surface of the plate heater 52, and constitute the heater device 50 together with a temperature control device (not shown). The surface of the heater 51 facing the string-like body 2 is formed with a slope 51m from the tip, and the entire heater 51 is held parallel to the holding device 40 at a position where the surface rubs the side of the string-like body 2. It can be moved up and down as

Heater 51. The plate heater 52 is made of a heat-resistant metal material that does not accumulate harmful oxides on its surface even if it is heated for a long time at a temperature of 500° C. or higher. In addition, the heaters 51, 5
The intervals between the heaters 51, 51, .
is positioned between each holder 41, 41, . . . .

The clamp fi l+160 consists of an upper clamp piece 61m and a lower clamp piece Blb that are arranged and fixed to the rotating wheels 63m and 63b via @82a and 62b, and has an arm 62m.
, 6Zb length.

The shape is rotating wheel 63m, 83b is rotating and both clamp pieces 6
1a.

When the holder 61b is closed, the joint between the string-like body 2 and the tip of the binding rope 1 is sandwiched between the holders 41, 41, and pressed. The relative positions of the pieces 61a and 61b should be such that a slight axis deviation δ occurs in the longitudinal direction of the binding rope 1, that is, in the direction perpendicular to the holding device 40i (Fig. 3). is a cylindrical aluminum block with a smooth surface.

Two sets of each unit having the above configuration are arranged facing each other, and a holder 4 is provided along the longitudinal direction of the string-like body 2.
Each part including 1.41... is several to several dozen.
Any number greater than 1 can be arranged in a row.

- When the rotary wheel 44 is rotated several tens of degrees in the direction of the arrow 61jJ, a gap between the vertically opposing holder plates 42 and 42 opens according to the rotation angle, so a string-like object is inserted into the gap. 2, the holder plates 42, 42 are closed to hold the string-like body 2 in a straight line.

At this time, the rough comb-shaped holders 41, 41, formed on the holder plates 42, 42, intermittently hold the string-shaped body 2 along its longitudinal direction, and The distance d is the distance between the joining position and the tip of the binding rope 1.

When the two square shafts 31, 32 of the gripping device 30 are slid in opposite directions in the direction of the arrows in FIG.
The gap between the tongue pieces 31a and 32a erected in Z becomes smaller, and the binding rope 1 can be gripped and held (Fig. 6).
Here, the length from the tongue pieces 31a, 32m to the tip of the tying rope 1 protruding to the string-like body 21III is such that the tying rope 1 can support its own weight with its rigidity, and all the tying ropes 1, 1 . . . shall be cut all at once using a heat wire cutter device (not shown) so that they have the same dimensions. When the table (not shown) on which the gripping device 30 is placed is moved upward and the ends of the binding ropes 1, 1... are made to face the sides of the string-like body 2, as shown in FIG. ) is obtained.

When the heater device i5G, which is heated to a predetermined temperature and controlled, is lowered, the sides of the heaters 51, 51... facing the string-like body 2 rub against the 1lIII portion of the string-like body 2, melting that part. (The state shown in FIG. 1(b)) At this time, since the heater 51 has an inclined surface 51a, when the string-like body 2 and the heater 51 come into contact, the former is scraped off or forced down. There is no fear.

When the table (not shown) is moved to bring the entire gripping device 30 closer to the string-like body 2, the tips of each of the binding ropes 1.1 are pressed against the negative faces of the heaters 51, 51. Each tip melts at the same time. (state of il[jJ(c)), Here, the time from when the heater 51 starts contacting the side of the string-like body 2 until the tip of the tying rope 1 contacts the heater 51, The opening when the body 2 is in contact with the heater 51 is controlled by a control device (not shown), and is set to the conditions for obtaining the optimum bonding result together with the surface temperature of the heater 51.

Next, the heater device 50 is pulled upward and the heater 51
When the contact between the tying rope 1 and the string-like body 2 is cut off, and the gripping device 30 is immediately further advanced toward the string-like body 2 by the table, the tips of the tying ropes 1, 1, . . . 2, and the molten portions formed on both parts come into close contact with each other due to contact with the heater 51 (as shown in FIG. 1(d)).

When the rotation wheels 63a, 63b are rotated in the direction of the arrow 612I, the upper clamp pieces 611.61m... and the lower two clamp pieces 61b, 61b...
a, 63b, and presses the joint between the tip of the tying rope 1 and the side of the string-like body 2 from above and below (the state shown in FIG. 1(e)). Since the joint parts are in a molten state, the pressing force between both lamp pieces 61a and 61b is extremely small.Furthermore, both clamp pieces 61m and 6
1b is provided with a misalignment δ of the ring center in the longitudinal direction of the tying rope 1 (Fig. 3), so the tying rope 1 and the string-like body 2, especially the latter, are pressed too much and the joining area becomes too small. Since the two clamp pieces 61a and 61b, which are less likely to be crushed, are made of aluminum blocks, they have high thermal conductivity and effectively remove heat from the melted parts, promoting cooling and solidification of the joined parts. In addition, since the surface is finished smooth, the molten binding rope 1
Or, it is extremely rare for the string-like body 2 to adhere.

Since the units that perform the above-mentioned functions are arranged in two sets facing each other, it is possible to simultaneously process both ends of the tying ropes 1, 1, and 2. Holders 41.41 arranged in rows along the longitudinal direction
. . . 1.1 . . . can be made into one patch processing unit. Therefore, if you go through the steps (,) or e) in tjS1 diagram! f! 11 in the ladder-like shape shown in Figure 1 ('')
product is obtained.

The φ11 operation order of each element constituting the above device, its operation timing, and the accompanying control of the pond can be centrally controlled by a control device (not shown), thereby making it possible to configure a fully automatic device.6 According to the invention As explained in detail, according to the first invention of this application,
By melting the tip of the tying rope and the gjIA part of the string-like body and joining them together, the entire area of the tying rope can contribute to the joint strength, so that the joint strength is sufficient, and Since there are no overlapping parts, there is an excellent effect in that the binding rope and the string-like body can be joined without becoming too tight at the joining part. On the other hand, according to the second invention, not only can the first invention be carried out, but also the movement of each component can be simplified, and the end treatment of a large number of tying ropes can be performed at the same time, so that the order of operation can be changed.

By centrally controlling the operation timing, etc., there is an effect that a fully automatic E1 production machine can be easily realized.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the first invention, (a) to e) in FIG. 1 are explanatory diagrams of each step, and (
f) is an explanatory diagram showing the situation in which intermediate products are lowered to final products, FIG. 2 is a view taken along arrow X-X#l in FIG. 1(b), fjS3
121 is the Y-IQ arrow view in FIG. 1(e). Fig. 4 is an external view and a sectional view showing the material to which the first invention is applied, in which Fig. 4(a) shows the binding rope 1, Fig. 4(b) shows the string-like body 2, and Fig. 5 shows the final product. FIG. 3 is an external view showing the state of use. 6 and 7 show an embodiment of the second invention, FIG. 6 is a perspective view showing the main part, FIG. 7(a) is a line A-A in FIG. 6,
FIG. 5B is a sectional view taken along line B-B of the fBG diagram. 1... Binding rope 2... String-like body 3o... Gripping device 51... Heater 60... Clamp isojo 61m.
...Upper clamp piece 61b...Lower clamp cantilever license applicant Nihonkai Packing Industry Co., Ltd.) Figure 1

Claims (1)

[Claims] 1) When fixing a plastic string-like body to the tip of a plastic tying rope at right angles, the tip of the tying rope and the side of the string-like body are brought into contact with a single heater. A plastic tying rope characterized in that, after melting, the molten portions generated at the tip of the tying rope and the side portions of the string-like body are joined to each other, and then this joined portion is cooled and solidified. Tip processing method. 2) The plastic bundle according to claim 1, wherein the contact by the heater starts with the side part of the string-like body before the contact with the tip of the binding rope. How to treat the tip of a rope. 3) The method for treating the tip of a plastic tying rope according to claim 1, wherein the cooling of the joint is carried out by pressing clamp pieces into contact from two directions sandwiching the joint. 4) One side rubs the side of the plastic string-like body,
A heater movable in a direction perpendicular to the longitudinal direction of the string-like body and an end of a plastic tying rope are moved in a direction perpendicular to the moving direction of the heater, and the tip of the tying rope is attached to the heater. A gripping device that melts the string-like body by bringing it into contact with the other side and then transfers it to the melted point on the side of the string-like body to join the body, and presses and cools the joint between the string-like body and the tip of the tying rope. A plastic tying rope tip processing device comprising a clamping mechanism. 5) The clamping mechanism is characterized in that when the joint portion is pressed, the axes of the upper clamp piece and the lower clamp piece are shifted from each other in the longitudinal direction of the binding rope. 4. A device for treating the tip of a plastic binding rope according to item 4.